10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý	Quarterly Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
	For the quarterly period ended June 30, 2015 or
o	Transition Report Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934
	For the transition period from__________ to __________

Commission file number: 001-32550

WESTERN ALLIANCE BANCORPORATION

(Exact name of registrant as specified in its charter)

Delaware	88-0365922
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

One E. Washington Street Suite 1400, Phoenix, AZ	85004
(Address of principal executive offices)	(Zip Code)

(602) 389-3500

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ý    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” "accelerated filer" and "smaller reporting company" in Rule 12b-2 of the Exchange Act.

Large accelerated filer	ý	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

Common stock issued and outstanding: 102,322,933 shares as of August 3, 2015.

INDEX

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)
	Consolidated Balance Sheets	4
	Consolidated Income Statements	5
	Consolidated Statements of Comprehensive Income	7
	Consolidated Statements of Stockholders’ Equity	8
	Consolidated Statements of Cash Flows	9
	Notes to Unaudited Consolidated Financial Statements	11
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	65
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	92
Item 4.	Controls and Procedures	94
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	95
Item 1A.	Risk Factors	95
Item 6.	Exhibits	96
SIGNATURES		98

2

PART I

GLOSSARY OF ENTITIES AND TERMS

The acronyms and abbreviations identified below are used in various sections of this Form 10-Q, including "Management's Discussion and Analysis of Financial Condition and Results of Operations," in Item 2 and the Consolidated Financial Statements and the Notes to Consolidated Financial Statements in Item I of this Form 10-Q.

ENTITIES:
AAB	Alliance Association Bank	FIB	First Independent Bank
ABA	Alliance Bank of Arizona	LVSP	Las Vegas Sunset Properties
BON	Bank of Nevada	TPB	Torrey Pines Bank
Bridge	Bridge Bank	WAB or Bank	Western Alliance Bank
Centennial	Centennial Bank	WAL or Parent	Western Alliance Bancorporation
Company	Western Alliance Bancorporation and Subsidiaries	Western Liberty	Western Liberty Bancorp
TERMS:
AFS	Available-for-Sale	GSE	Government-Sponsored Enterprise
ALCO	Asset and Liability Management Committee	HFI	Held for Investment
AOCI	Accumulated Other Comprehensive Income	HFS	Held for Sale
ARPS	Adjustable-Rate Preferred Stock	HTM	Held-to-Maturity
ASC	Accounting Standards Codification	ICS	Insured Cash Sweep Service
ASU	Accounting Standards Update	IRC	Internal Revenue Code
ATM	At-the-Market	ISDA	International Swaps and Derivatives Association
BOD	Board of Directors	LIBOR	London Interbank Offered Rate
CBL	Central Business Lines	LIHTC	Low-Income Housing Tax Credit
CDARS	Certificate Deposit Account Registry Service	MBS	Mortgage-Backed Securities
CDO	Collateralized Debt Obligation	NOL	Net Operating Loss
CEO	Chief Executive Officer	NPV	Net Present Value
CFO	Chief Financial Officer	NUBILs	Net Unrealized Built In Losses
CRA	Community Reinvestment Act	OCI	Other Comprehensive Income
CRE	Commercial Real Estate	OREO	Other Real Estate Owned
EPS	Earnings per share	OTTI	Other-than-Temporary Impairment
EVE	Economic Value of Equity	PCI	Purchased Credit Impaired
Exchange Act	Securities Exchange Act of 1934, as amended	SBIC	Small Business Investment Company
FASB	Financial Accounting Standards Board	SEC	Securities and Exchange Commission
FDIC	Federal Deposit Insurance Corporation	SERP	Supplemental Executive Retirement Plan
FHLB	Federal Home Loan Bank	SSAE	Statement on Standards for Attestation Engagements
FRB	Federal Reserve Bank	TDR	Troubled Debt Restructuring
FVO	Fair Value Option	TEB	Tax Equivalent Basis
GAAP	U.S. Generally Accepted Accounting Principles	XBRL	eXtensible Business Reporting Language

3

Item 1. Financial Statements.

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	June 30, 2015			December 31, 2014
	(Unaudited)
	(in thousands, except per share amounts)
Assets:
Cash and due from banks	$	149,929		$	125,329
Securities purchased under agreement to resell	58,150			—
Interest-bearing deposits in other financial institutions	550,257			39,067
Cash and cash equivalents	758,336			164,396
Money market investments	875			451
Investment securities - measured at fair value	1,701			1,858
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	1,478,234			1,520,237
Investments in restricted stock, at cost	51,040			25,275
Loans - HFS	39,401			—
Loans - HFI, net of deferred loan fees and costs	10,321,221			8,398,265
Less: allowance for credit losses	(115,056		)	(110,216		)
Total loans held for investment	10,206,165			8,288,049
Premises and equipment, net	116,044			113,818
Other assets acquired through foreclosure, net	59,335			57,150
Bank owned life insurance	161,100			141,969
Goodwill	282,851			23,224
Other intangible assets, net	17,124			2,689
Deferred tax assets, net	82,075			62,686
Other assets	215,823			198,696
Total assets	$	13,470,104		$	10,600,498
Liabilities:
Deposits:
Non-interest-bearing demand	$	3,924,456		$	2,288,048
Interest-bearing	7,482,272			6,642,995
Total deposits	11,406,728			8,931,043
Customer repurchase agreements	42,172			54,899
Securities sold short	57,580			—
Other borrowings	69,429			390,263
Qualifying debt	208,417			40,437
Other liabilities	171,034			182,928
Total liabilities	11,955,360			9,599,570
Commitments and contingencies (Note 13)
Stockholders’ equity:
Preferred stock - par value $0.0001 and liquidation value per share of $1,000; 20,000,000 authorized; 70,500 shares issued and outstanding at June 30, 2015 and December 31, 2014	70,500			70,500
Common stock - par value $0.0001; 200,000,000 authorized; 102,290,865 shares issued and outstanding at June 30, 2015 and 88,691,249 at December 31, 2014	10			9
Additional paid in capital	1,268,947			828,327
Accumulated other comprehensive income	15,348			16,639
Retained earnings	159,939			85,453
Total stockholders’ equity	1,514,744			1,000,928
Total liabilities and stockholders’ equity	$	13,470,104		$	10,600,498

See accompanying Notes to Unaudited Consolidated Financial Statements.

4

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED INCOME STATEMENTS (Unaudited)

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands, except per share amounts)
Interest income:
Loans, including fees	$	105,468		$	90,583		$	205,859		$	177,387
Investment securities	8,003			9,926			16,516			20,153
Dividends	1,273			968			2,548			2,066
Other	1,874			496			2,657			1,068
Total interest income	116,618			101,973			227,580			200,674
Interest expense:
Deposits	5,362			4,930			10,508			9,595
Other borrowings	2,068			2,686			4,312			5,505
Qualifying debt	451			443			892			864
Customer repurchase agreements	19			16			42			35
Total interest expense	7,900			8,075			15,754			15,999
Net interest income	108,718			93,898			211,826			184,675
Provision for credit losses	—			507			700			4,007
Net interest income after provision for credit losses	108,718			93,391			211,126			180,668
Non-interest income:
Service charges and fees	3,128			2,758			6,017			5,319
Income from bank owned life insurance	772			959			1,749			1,908
Card income	899			860			1,712			1,645
Gain (loss) on sales of investment securities, net	55			(163		)	644			203
Loss on extinguishment of debt	(81		)	—			(81		)	—
Unrealized (losses) gains on assets and liabilities measured at fair value, net	(7,885		)	235			(8,194		)	(1,041		)
Other income	921			950			1,895			2,120
Total non-interest (loss) income	(2,191		)	5,599			3,742			10,154
Non-interest expense:
Salaries and employee benefits	32,406			31,751			64,947			61,306
Occupancy	4,949			4,293			9,762			8,979
Legal, professional, and directors' fees	4,611			4,192			8,606			7,831
Data processing	2,683			2,580			5,809			5,309
Insurance	2,274			2,087			4,364			4,480
Loan and repossessed asset expenses	1,284			889			2,374			2,036
Card expense	613			530			1,087			1,130
Marketing	463			506			840			1,065
Intangible amortization	281			302			562			899
Net (gain) loss on sales / valuations of repossessed and other assets	(1,218		)	184			(1,569		)	(2,377		)
Acquisition / restructure expense	7,842			26			8,001			183
Other expense	5,021			4,902			10,459			10,870
Total non-interest expense	61,209			52,242			115,242			101,711
Income from continuing operations before provision for income taxes	45,318			46,748			99,626			89,111
Income tax expense	10,599			10,706			24,717			21,330
Income from continuing operations	34,719			36,042			74,909			67,781
Loss from discontinued operations, net of tax	—			(504		)	—			(1,158		)
Net income	34,719			35,538			74,909			66,623
Dividends on preferred stock	247			352			423			705
Net income available to common stockholders	$	34,472		$	35,186		$	74,486		$	65,918

5

	Three Months Ended June 30,					Six Months Ended June 30,
	2015		2014			2015		2014
	(in thousands, except per share amounts)
Earnings per share from continuing operations:
Basic	$	0.39	$	0.41		$	0.85	$	0.78
Diluted	0.39		0.41			0.84		0.77
Loss per share from discontinued operations:
Basic	—		—			—		(0.02		)
Diluted	—		(0.01		)	—		(0.01		)
Earnings per share available to common stockholders:
Basic	0.39		0.41			0.85		0.76
Diluted	0.39		0.40			0.84		0.76
Weighted average number of common shares outstanding:
Basic	88,177		86,501			88,059		86,379
Diluted	88,682		87,333			88,567		87,229
Dividends declared per common share	$	—	$	—		$	—	$	—

See accompanying Notes to Unaudited Consolidated Financial Statements.

6

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited)

	Three Months Ended June 30,					Six Months Ended June 30,
	2015			2014		2015			2014
	(in thousands)
Net income	$	34,719		$	35,538	$	74,909		$	66,623
Other comprehensive income (loss), net:
Unrealized gain on transfer of HTM securities to AFS, net of tax effect of $0, $(5,367), $0, and $(5,367), respectively	—			8,976		—			8,976
Unrealized (loss) gain on AFS securities, net of tax effect of $5,135, $(6,294), $858, and $(12,658), respectively	(8,378		)	10,525		(1,225		)	21,169
Unrealized gain on SERP, net of tax effect of $(207), $0, $(207), $0, respectively	337			—		337			—
Realized (gain) loss on sale of AFS securities included in income, net of tax effect of $21, $(61), $241, and $76, respectively	(34		)	102		(403		)	(127		)
Net other comprehensive (loss) income	(8,075		)	19,603		(1,291		)	30,018
Comprehensive income	$	26,644		$	55,141	$	73,618		$	96,641

See accompanying Notes to Unaudited Consolidated Financial Statements.

7

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited)

	Preferred Stock			Common Stock			Additional Paid in Capital		Accumulated Other Comprehensive Income (Loss)			Retained Earnings (Accumulated Deficit)			Total Stockholders’ Equity
	Shares	Amount		Shares	Amount
	(in thousands)
Balance, December 31, 2013	141	$	141,000	87,186	$	9	$	797,146	$	(21,546	)	$	(61,111	)	$	855,498
Net income	—	—		—	—		—		—			66,623			66,623
Exercise of stock options	—	—		169	—		1,996		—			—			1,996
Restricted stock, performance stock unit, and other grants, net	—	—		303	—		1,623		—			—			1,623
Issuance of common stock under ATM offering, net of offering costs	—	—		116	—		2,611		—			—			2,611
Dividends on preferred stock	—	—		—	—		—		—			(705		)	(705		)
Other comprehensive income, net	—	—		—	—		—		30,018			—			30,018
Balance, June 30, 2014	141	$	141,000	87,774	$	9	$	803,376	$	8,472		$	4,807		$	957,664
Balance, December 31, 2014	71	$	70,500	88,691	$	9	$	828,327	$	16,639		$	85,453		$	1,000,928
Net income	—	—		—	—		—		—			74,909			74,909
Exercise of stock options	—	—		145	—		1,537		—			—			1,537
Restricted stock, performance stock unit, and other grants, net	—	—		458	—		8,053		—			—			8,053
Issuance of common stock in connection with the acquisition of Bridge (1)	—	—		12,997	1		431,030		—			—			431,031
Dividends on preferred stock	—	—		—	—		—		—			(423		)	(423		)
Other comprehensive loss, net	—	—		—	—		—		(1,291		)	—			(1,291		)
Balance, June 30, 2015	71	$	70,500	102,291	$	10	$	1,268,947	$	15,348		$	159,939		$	1,514,744

(1)    Includes value of certain share-based awards replaced in connection with the acquisition.

See accompanying Notes to Unaudited Consolidated Financial Statements.

8

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited)

	Six Months Ended June 30,
	2015			2014
	(in thousands)
Cash flows from operating activities:
Net income	$	74,909		$	66,623
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	700			4,007
Depreciation and amortization	3,943			3,220
Stock-based compensation	7,908			6,039
Excess tax benefit of stock-based compensation	(5,164		)	(1,830		)
Deferred income taxes	(2,345		)	(6,665		)
Amortization of net premiums for investment securities	4,133			4,048
Accretion of fair market value adjustments on loans acquired from business combinations	(4,118		)	(8,962		)
Accretion and amortization of fair market value adjustments on other assets and liabilities acquired from business combinations	247			(193		)
Income from bank owned life insurance	(1,749		)	(1,908		)
Unrealized losses on assets and liabilities measured at fair value, net	8,194			1,041
(Gains) / Losses on:
Sales of investment securities	(644		)	(203		)
Sale of loans	(319		)	—
Extinguishment of debt	81			—
Other assets acquired through foreclosure, net	(3,055		)	(1,179		)
Valuation adjustments of other repossessed assets, net	1,504			293
Sale of premises, equipment, and other assets, net	(18		)	(1,491		)
Changes in, net of acquisitions:
Other assets	8,742			7,419
Other liabilities	(15,996		)	(9,738		)
Net cash provided by operating activities	76,953			60,521
Cash flows from investing activities:
Investment securities - measured at fair value
Principal pay downs and maturities	143			261
Investment securities - AFS
Purchases	(94,532		)	(38,785		)
Principal pay downs and maturities	114,127			124,615
Proceeds from sales	78,040			26,840
Investment securities - HTM
Principal pay downs and maturities	—			6,600
Purchase of investment tax credits	(11,884		)	(16,948		)
(Purchase) sale of money market investments, net	(424		)	1,225
(Purchase) liquidation of restricted stock	(18,749		)	4,911
Loan fundings and principal collections, net	(515,143		)	(719,720		)
Purchase of premises, equipment, and other assets, net	(3,886		)	(5,491		)
Proceeds from sale of other real estate owned and repossessed assets, net	14,375			14,732
Cash and cash equivalents acquired in Bridge acquisition, net	342,427			—
Net cash used in investing activities	(95,506		)	(601,760		)

9

	Six Months Ended June 30,
	2015			2014
	(in thousands)
Cash flows from financing activities:
Net increase in deposits	733,788			631,609
Proceeds from issuance of subordinated debt	148,450			—
Net decrease in borrowings	(276,023		)	(22,334		)
Proceeds from exercise of common stock options	1,537			1,996
Excess tax benefit of stock-based compensation	5,164			1,830
Cash dividends paid on preferred stock	(423		)	(705		)
Proceeds from issuance of stock in offerings, net	—			2,611
Net cash provided by financing activities	612,493			615,007
Net increase in cash and cash equivalents	593,940			73,768
Cash and cash equivalents at beginning of period	164,396			305,514
Cash and cash equivalents at end of period	$	758,336		$	379,282
Supplemental disclosure:
Cash paid during the period for:
Interest	$	13,881		$	10,423
Income taxes	25,801			17,180
Non-cash investing and financing activity:
Transfers to other assets acquired through foreclosure, net	13,459			6,419
Change in unfunded investment tax credits and SBIC commitments	2,168			12,298
Non-cash assets acquired in Bridge acquisition	1,590,927			—
Non-cash liabilities acquired in Bridge acquisition	1,761,951			—
Change in unrealized gain on AFS securities, net of tax	(1,628		)	21,042
Change in unfunded obligations	13,654			(9,506		)
Unrealized gain on transfer of HTM securities to AFS, net of tax	—			8,976

See accompanying Notes to Unaudited Consolidated Financial Statements.

10

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

NOTES TO UNAUDITED CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Nature of operation

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB Northern California offices are operating as a combined division under the Bridge trade name.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equipment Finance, Public Finance, Resort Finance, Technology Finance, Energy Infrastructure Group, and Mortgage Warehouse Lending. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Unaudited Consolidated Financial Statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and other assets and liabilities carried at fair value; and accounting for income taxes. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the Unaudited Consolidated Financial Statements.

Principles of consolidation

As of June 30, 2015, WAL has ten wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities.

The Bank has the following wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal loans, and leases; BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; Western Alliance Equipment Finance, which offers equipment finance services nationwide. BW Nevada Holdings, LLC was dissolved on June 12, 2015 after contributing the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Certain amounts in the Consolidated Financial Statements as of December 31, 2014 and for the three and six months ended June 30, 2014 may have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

11

Interim financial information

The accompanying Unaudited Consolidated Financial Statements as of and for the three and six months ended June 30, 2015 and 2014 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.

The information furnished in these interim statements reflects all adjustments which are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year. The interim financial information should be read in conjunction with the Company's audited Consolidated Financial Statements.

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Investment securities

Investment securities may be classified as HTM, AFS, or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.

Securities classified as AFS or trading are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security, adjusted for prepayment estimates, using the interest method.

In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and whether it is not more likely than not the Company would be required to sell the security.

Declines in the fair value of individual AFS debt securities that are deemed to be other-than-temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) interest rate, market, or other factors is recognized in other comprehensive income or loss.

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For individual debt securities where the Company either intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.

Restricted stock

On January 30, 2015, WAB became a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in capital stock of the FHLB based on the borrowing capacity used. The Company also maintains an investment in its primary correspondent bank. All of these investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. The dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

Loans, held for investment

The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by net deferred fees and costs, and an allowance for credit losses. In addition, the book value of loans that are subject to a fair value hedge is adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk. Purchased loans are recorded at estimated fair value on the date of purchase, comprised of unpaid principal less estimated credit losses and interest rate fair value adjustments.

The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected, which are due, at least in part, to credit quality. Loans are evaluated individually to determine if there has been credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not carry over or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For additional information, see "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

For purchased loans that are not deemed impaired, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period.

When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Non-accrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.

For all loan types, when a loan is placed on non-accrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed and, the Company makes a loan-level decision to apply either the cash basis

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or cost recovery method. The Company recognizes income on a cash basis only for those non-accrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required.

Impaired loans: A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis, if full repayment of all principal and interest is expected and the loan is both well secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are recorded as a provision for credit losses. Losses are recorded as a charge-off when losses are confirmed. In addition to management's internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations or loan impairment methodology.

Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan is also considered impaired. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months) and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. However, such loans continue to be considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) the Company's historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowance for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

The allowance consists of specific and general components. The specific allowance applies to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on the collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

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The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

Other assets acquired through foreclosure

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).

The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk are recorded in current-period earnings. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value in the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported in the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that 1) the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and 2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where 1) the host contract is measured at fair value, with changes in fair value reported in current earnings, or 2) the Company is unable to reliably identify and measure an

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embedded derivative for separation from its host contract, the entire contract is carried in the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered.As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit from an unrecognized tax benefit may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in other liabilities in the Consolidated Balance Sheet.

Off-balance sheet instruments

In the ordinary course of business, the Company has entered into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Financial Statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheet. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included in other liabilities and the charge to income that establishes this liability is included in non-interest expense.

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement as well as enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

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• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

• Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure. When market assumptions are available, ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at June 30, 2015 and December 31, 2014. The estimated fair value amounts for June 30, 2015 and December 31, 2014 have been measured as of period-end, and have not been reevaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 14. Fair Value Accounting" in these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.

Money market investments

The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.

Investment securities

The fair values of CRA investments, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.

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The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company engages a third party to estimate the future cash flows and discount rate using third party quotes adjusted based on assumptions a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.

Restricted stock

WAB is a member of the Federal Reserve System and the FHLB and, accordingly, maintains investments in the capital stock of the FRB and the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. The fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans is categorized as Level 2 in the fair value hierarchy, excluding impaired loans which are categorized as Level 3.

Accrued interest receivable and payable

The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value.

Derivative financial instruments

All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products, or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances, other borrowings, and subordinated debt

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. Other borrowings have been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued by comparing the BB Financial over SWAP index and discounting the contractual cash flows on the Company's debt using these market rates. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Off-balance sheet instruments

The fair value of the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) is based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and the counterparties’ credit standing.

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Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance should be applied on a retrospective basis. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update.

On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.6 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs are not significant.

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2. MERGERS, ACQUISITIONS AND DISPOSITIONS

Acquisition of Bridge Capital Holdings

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank, headquartered in San Jose, California. Under the terms of the acquisition, each outstanding share of Bridge common stock was exchanged for 0.8145 shares of WAL's common stock plus $2.39 in cash. The Company paid $36.5 million in cash and issued 12.5 million common shares for all equity interests in Bridge. The merger was undertaken, in part, because Bridge strengthens the Company's Northern California presence and provides new avenues for growth in technology and international services.

Bridge’s results of operations will be included in the Company’s results beginning July 1, 2015. Acquisition / restructure expenses related to the Bridge acquisition of $7.8 million and $8.0 million for three and six months ended June 30, 2015, respectively, have been included in non-interest expense, of which, approximately $0.6 million are acquisition related costs as defined by ASC 805. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. The fair values of assets acquired and liabilities assumed are subject to adjustment during the first twelve months after the acquisition date if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability. As the acquisition was completed at quarter end, the fair values of substantially all of the net assets are considered preliminary.

The Company merged Bridge Bank into WAB effective June 30, 2015, creating combined assets for the resulting bank of $13.47 billion and deposits of $11.41 billion. The recognized amounts of identifiable assets acquired and liabilities assumed are as follows:

	June 30, 2015
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,349
Investments in restricted stock	7,015
Loans	1,447,135
Premises and equipment	1,931
Other assets acquired through foreclosure	1,550
Bank owned life insurance	17,385
Investment in LIHTC	5,648
Intangible assets	14,997
Deferred tax assets, net	14,261
Other assets	19,656
Total assets	$	1,969,893
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	8,633
Total liabilities	1,761,951
Net assets acquired	$	207,942
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	259,627

(1) Cash and cash equivalents is net of a $6.2 million payment made by Bridge related to the cash out of vested, unexercised stock options at the date of closing. Cash acquired, less cash consideration paid of $36.5 million, resulted in net cash and cash equivalents increasing by $342.4 million following the acquisition.

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Loans acquired in the Bridge acquisition consist of loans that are not considered impaired (non-PCI loans) and loans that have shown evidence of credit deterioration since origination (PCI loans) as of the acquisition date. All loans were recorded net of fair value adjustments (interest rate and credit marks), which were determined using discounted contractual cash flow models. The fair value of non-PCI loans acquired totals $1.43 billion, which is net of interest and credit marks of $23.0 million. The fair value of PCI loans totals $12.2 million, which is net of interest and credit marks of $2.1 million. See "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements for additional detail of the acquired loans.

In connection with the Bridge acquisition, the Company acquired intangible assets of $15.0 million, consisting primarily of core deposit intangibles. The core deposit intangible asset balance has been allocated to the Northern California and CBL segments based on their respective core deposit balances at June 30, 2015, and is subject to amortization over its estimated useful life of 10 years.

Goodwill in the amount of $259.6 million was recognized as a result of the acquisition, none of which is expected to be deductible for income tax purposes. Goodwill has been allocated to the newly formed Northern California and CBL segments based on their proportionate loan and deposit balances as of June 30, 2015. Management believes this methodology allocates goodwill to the reporting units in a manner consistent with the expected synergies of the combination.

Qualifying debt assumed from Bridge is comprised of junior subordinated debt with a contractual balance of $17.5 million and is recorded net of a $6.2 million fair value mark that will be amortized over the remaining life of the trusts. See "Note 7. Qualifying Debt" of these Notes to Unaudited Consolidated Financial Statements for further detail and discussion of the debt.

In connection with the acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge executives based on years of service and final average salary. Pursuant to the terms of the SERP agreements, if the executive officer's service is terminated by Bridge or by the executive officer for "good reason" (as defined in the SERP agreements) within 24 months following a change in control, such as the Bridge acquisition, the executive officer is entitled to full vesting of the normal benefit under the SERP agreement, and such SERP benefits will be made in installment payments commencing on the first business day of January of the year following the executive officer's attainment of age 55 or, if the executive officer is already age 55 as of such termination of employment, on the first business day of January of the year following the executive officer's termination of employment. As of June 30, 2015, a $7.1 million liability included in other liabilities was recorded in the Company's Consolidated Balance Sheet related to the SERP. A discount rate of 5.75% and a 4.00% employee compensation rate increase were used in determining the SERP liability as of June 30, 2015.

The following table presents pro forma information as if the Bridge acquisition was completed on January 1, 2014. The pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction and interest expense on deposits acquired. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates. 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Interest income	$	139,080	$	121,744	$	271,502	$	239,072
Non-interest income	1,840		9,578		11,047		16,882
Net income available to common stockholders (1)	45,607		39,452		90,372		73,901
Earnings per share - basic	$	0.45	$	0.40	$	0.89	$	0.74
Earnings per share - diluted	$	0.44	$	0.39	$	0.88	$	0.73

(1) Excludes acquisition / restructure related costs incurred by the Company of $7.8 million and $8.0 million for the three and six months ended June 30, 2015, respectively, and acquisition / restructure related costs incurred by Bridge of $5.6 million and $6.8 million for the three and six months ended June 30, 2015, respectively, and related tax effects.

21

PartnersFirst Discontinued Operations

The Company discontinued its affinity credit card business and presented these activities as discontinued operations. During the second quarter 2014, the Company shut down its remaining affinity credit card operations. Therefore, no additional discontinued operations have been reported.

The following table summarizes the operating results of the discontinued operations for the three and six months ended June 30, 2014: 

	Three Months Ended June 30, 2014			Six Months Ended June 30, 2014
	(in thousands)
Operating revenue	$	(214	)	$	(358	)
Non-interest expenses	(511		)	(1,369		)
Loss before income taxes	(725		)	(1,727		)
Income tax benefit	(221		)	(569		)
Net loss	$	(504	)	$	(1,158	)

3. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities at June 30, 2015 and December 31, 2014 are summarized as follows: 

	June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	10,754	$	—		$	10,804
Commercial MBS issued by GSEs	13,145		64		—			13,209
Corporate debt securities	13,097		568		—			13,665
CRA investments	32,599		—		(62		)	32,537
Municipal obligations	281,895		10,889		(371		)	292,413
Preferred stock	82,888		1,935		(1,772		)	83,051
Private label commercial MBS	4,908		71		—			4,979
Private label residential MBS	102,760		250		(939		)	102,071
Residential MBS issued by GSEs	861,681		11,297		(1,621		)	871,357
Trust preferred securities	32,000		—		(6,352		)	25,648
U.S. government sponsored agency securities	24,906		—		(297		)	24,609
U.S. treasury securities	3,891		—		—			3,891
Total AFS securities	$	1,453,820	$	35,828	$	(11,414	)	$	1,478,234
Securities measured at fair value
Residential MBS issued by GSEs								$	1,701

22

	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
Available-for-sale
Collateralized debt obligations	$	50	$	11,395	$	—		$	11,445
Commercial MBS issued by GSEs	2,047		100		—			2,147
Corporate debt securities	52,773		717		(1,001		)	52,489
CRA investments	24,302		30		—			24,332
Municipal obligations	285,398		13,688		(49		)	299,037
Mutual funds	37,449		500		(247		)	37,702
Preferred stock	83,192		2,099		(2,679		)	82,612
Private label commercial MBS	5,017		132		—			5,149
Private label residential MBS	70,985		379		(1,121		)	70,243
Residential MBS issued by GSEs	881,734		11,440		(1,985		)	891,189
Trust preferred securities	32,000		—		(6,454		)	25,546
U.S. government-sponsored agency securities	18,701		—		(355		)	18,346
Total AFS securities	$	1,493,648	$	40,480	$	(13,891	)	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs								$	1,858

For additional information on the fair value changes of the securities measured at fair value, see the trading securities table in "Note 14. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements.

The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI for both debt and equity securities is a decline in the market value below the amount recorded for an investment, and taking into account the severity and duration of the decline. Another potential indication of OTTI is a downgrade below investment grade. In determining whether an impairment is OTTI, the Company considers the length of time and the extent to which the market value has been below cost, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions of its industry, and the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery. For marketable equity securities, the Company also considers the issuer’s financial condition, capital strength, and near-term prospects.

For debt securities, for the purpose of an OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates and industry and issuer-specific factors), the issuer’s financial condition, near-term prospects, and current ability to make future payments in a timely manner, as well as the issuer’s ability to service debt, and any change in agencies’ ratings at the evaluation date from the acquisition date and any likely imminent action. For ARPS with a fair value below cost that is not attributable to the credit deterioration of the issuer, such as a decline in cash flows from the security or a downgrade in the security’s rating below investment grade, a loss is recorded in other comprehensive income rather than earnings when the Company determines that it has the intent and ability to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value.

The Company has reviewed securities for which there is an unrealized loss in accordance with its accounting policy for OTTI described above and determined that there were no impairment charges for the three and six months ended June 30, 2015 and 2014. The Company does not consider any securities to be other-than-temporarily impaired as of June 30, 2015 and December 31, 2014. No assurance can be made that OTTI will not occur in future periods.

23

Information pertaining to securities with gross unrealized losses at June 30, 2015 and December 31, 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	June 30, 2015
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
CRA investments	$	62	$	24,446	$	—	$	—	$	62	$	24,446
Municipal obligations	371		20,722		—		—		371		20,722
Preferred stock	513		16,791		1,259		17,798		1,772		34,589
Private label residential MBS	365		31,789		574		22,920		939		54,709
Residential MBS issued by GSEs	655		116,929		966		43,114		1,621		160,043
Trust preferred securities	—		—		6,352		25,648		6,352		25,648
U.S. government sponsored agency securities	—		—		297		18,403		297		18,403
Total AFS securities	$	1,966	$	210,677	$	9,448	$	127,883	$	11,414	$	338,560

	December 31, 2014
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Corporate debt securities	$	139	$	9,860	$	862	$	29,139	$	1,001	$	38,999
Municipal obligations	—		—		49		4,430		49		4,430
Mutual funds	247		25,855		—		—		247		25,855
Preferred stock	232		13,811		2,447		28,109		2,679		41,920
Private label residential MBS	157		24,056		964		26,614		1,121		50,670
Residential MBS issued by GSEs	227		49,217		1,758		97,296		1,985		146,513
Trust preferred securities	—		—		6,454		25,546		6,454		25,546
U.S. government sponsored agency securities	—		—		355		18,346		355		18,346
Total AFS securities	$	1,002	$	122,799	$	12,889	$	229,480	$	13,891	$	352,279

At June 30, 2015 and December 31, 2014, the Company’s unrealized losses relate primarily to interest rate fluctuations, credit spread widening, and reduced liquidity in applicable markets. The total number of securities in an unrealized loss position at June 30, 2015 was 105, compared to 109 at December 31, 2014. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and industry analysis reports. Since material downgrades have not occurred and management does not intend to sell the debt securities in an unrealized loss position in the foreseeable future, none of the securities described in the above table or in this paragraph were deemed to be OTTI.

The preferred stock and trust preferred securities have yields based on floating rate LIBOR, which are highly correlated to the federal funds rate and have been negatively affected by the low rate environment. This has resulted in unrealized losses for these securities. The FRB continues to express its intention to keep interest rates, particularly the federal funds rate, at historically low levels through 2015.

24

The amortized cost and fair value of securities as of June 30, 2015, by contractual maturities, are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary. 

	June 30, 2015
	Amortized Cost		Estimated Fair Value
	(in thousands)
Available-for-sale
Due in one year or less	$	45,871	$	45,989
After one year through five years	68,992		71,415
After five years through ten years	102,814		105,800
After ten years	253,649		263,414
Mortgage-backed securities	982,494		991,616
Total AFS securities	$	1,453,820	$	1,478,234

The following tables summarize the carrying amount of the Company’s investment ratings position as of June 30, 2015 and December 31, 2014: 

	June 30, 2015
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	10,804	$	—	$	10,804
Commercial MBS issued by GSEs	—		13,209		—		—		—		—		—		13,209
Corporate debt securities	—		—		2,748		10,591		—		—		326		13,665
CRA investments	—		—		—		—		—		—		32,537		32,537
Municipal obligations	9,284		—		145,706		131,055		6,183		185		—		292,413
Preferred stock	—		—		—		—		55,223		18,062		9,766		83,051
Private label commercial MBS	4,979		—		—		—		—		—		—		4,979
Private label residential MBS	70,856		—		181		11,434		15,969		3,488		143		102,071
Residential MBS issued by GSEs	—		871,357		—		—		—		—		—		871,357
Trust preferred securities	—		—		—		—		25,648		—		—		25,648
U.S. government sponsored agency securities	—		24,609		—		—		—		—		—		24,609
U.S. treasury securities	—		3,891		—		—		—		—		—		3,891
Total AFS securities (1)	$	85,119	$	913,066	$	148,635	$	153,080	$	103,023	$	32,539	$	42,772	$	1,478,234
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,701	$	—	$	—	$	—	$	—	$	—	$	1,701

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

25

	December 31, 2014
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	11,445	$	—	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		—		—		—		—		2,147
Corporate debt securities	—		—		2,759		5,570		44,160		—		—		52,489
CRA investments	—		—		—		—		—		—		24,332		24,332
Municipal obligations	8,168		—		138,256		146,155		6,263		195		—		299,037
Mutual funds (2)	—		—		—		—		37,702		—		—		37,702
Preferred stock	—		—		—		—		54,585		17,632		10,395		82,612
Private label commercial MBS	5,149		—		—		—		—		—		—		5,149
Private label residential MBS	59,944		—		68		3,439		3,595		3,197		—		70,243
Residential MBS issued by GSEs	—		891,189		—		—		—		—		—		891,189
Trust preferred securities	—		—		—		—		25,546		—		—		25,546
U.S. government sponsored agency securities	—		18,346		—		—		—		—		—		18,346
Total AFS securities (1)	$	73,261	$	911,682	$	141,083	$	155,164	$	171,851	$	32,469	$	34,727	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	—	$	—	$	—	$	—	$	1,858

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

(2) At least 80% of mutual funds are investment grade corporate debt securities.

Securities with carrying amounts of approximately $658.8 million and $755.5 million at June 30, 2015 and December 31, 2014, respectively, were pledged for various purposes as required or permitted by law.

The following table presents gross gains and losses on sales of investment securities: 

	Three Months Ended June 30,					Six Months Ended June 30,
	2015		2014			2015			2014
	(in thousands)
Gross gains	$	55	$	—		$	1,103		$	366
Gross losses	—		(163		)	(459		)	(163		)
Net gains on sales of investment securities	$	55	$	(163	)	$	644		$	203

26

4. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

The composition of the Company’s loan portfolio is as follows: 

	June 30, 2015			December 31, 2014
	(in thousands)
Loans, held for investment
Commercial and industrial	$	4,576,303		$	3,326,708
Commercial real estate - non-owner occupied	2,195,018			2,052,566
Commercial real estate - owner occupied	2,019,280			1,732,888
Construction and land development	1,002,698			748,053
Residential real estate	320,591			299,402
Commercial leases	183,378			205,639
Consumer	23,953			33,009
Loans, net of deferred loan fees and costs	10,321,221			8,398,265
Allowance for credit losses	(115,056		)	(110,216		)
Total loans HFI	$	10,206,165		$	8,288,049

Net deferred loan fees and costs as of June 30, 2015 and December 31, 2014 total $14.0 million and $12.5 million, respectively. Net unamortized discounts on loans total $8.1 million and $7.5 million as of June 30, 2015 and December 31, 2014, respectively.

As of June 30, 2015, the Company also has $39.4 million of HFS loans.

The following table presents the contractual aging of the recorded investment in past due loans held for investment by class of loans:

	June 30, 2015
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,018,462	$	343	$	—	$	475	$	818	$	2,019,280
Non-owner occupied	2,000,579		181		—		3,626		3,807		2,004,386
Multi-family	190,207		—		—		425		425		190,632
Commercial and industrial
Commercial	4,566,978		1,692		1,239		6,394		9,325		4,576,303
Leases	183,378		—		—		—		—		183,378
Construction and land development
Construction	597,059		—		—		—		—		597,059
Land	404,356		—		—		1,283		1,283		405,639
Residential real estate	310,628		169		151		9,643		9,963		320,591
Consumer	23,515		13		219		206		438		23,953
Total loans	$	10,295,162	$	2,398	$	1,609	$	22,052	$	26,059	$	10,321,221

27

	December 31, 2014
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,730,164	$	1,406	$	180	$	1,138	$	2,724	$	1,732,888
Non-owner occupied	1,855,454		2,389		3,361		8,737		14,487		1,869,941
Multi-family	182,180		—		445		—		445		182,625
Commercial and industrial
Commercial	3,324,132		1,523		15		1,038		2,576		3,326,708
Leases	205,639		—		—		—		—		205,639
Construction and land development
Construction	388,399		—		—		—		—		388,399
Land	356,209		—		2,640		805		3,445		359,654
Residential real estate	292,065		2,347		205		4,785		7,337		299,402
Consumer	32,540		177		21		271		469		33,009
Total loans	$	8,366,782	$	7,842	$	6,867	$	16,774	$	31,483	$	8,398,265

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing interest by class of loans: 

	June 30, 2015								December 31, 2014
	Non-accrual loans						Loans past due 90 days or more and still accruing		Non-accrual loans						Loans past due 90 days or more and still accruing
	Current		Past Due/ Delinquent		Total Non-accrual				Current		Past Due/ Delinquent		Total Non-accrual
	(in thousands)
Commercial real estate
Owner occupied	$	10,090	$	—	$	10,090	$	474	$	13,630	$	—	$	13,630	$	1,138
Non-owner occupied	26,756		2,769		29,525		858		30,226		8,601		38,827		2,171
Multi-family	—		—		—		425		—		—		—		—
Commercial and industrial
Commercial	809		2,241		3,050		4,153		2,621		496		3,117		703
Leases	3,930		—		3,930		—		373		—		373		—
Construction and land development
Construction	—		—		—		—		—		—		—		—
Land	2,516		—		2,516		1,283		2,686		2,640		5,326		805
Residential real estate	1,556		8,561		10,117		1,082		1,332		4,841		6,173		232
Consumer	—		197		197		9		25		188		213		83
Total	$	45,657	$	13,768	$	59,425	$	8,284	$	50,893	$	16,766	$	67,659	$	5,132

The reduction in interest income associated with loans on non-accrual status was approximately $0.7 million and $0.8 million for the three months ended June 30, 2015 and 2014, respectively, and $1.4 million and $1.8 million for the six months ended June 30, 2015 and 2014, respectively.

The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company’s risk rating system, the Company classifies problem and potential problem loans as Special Mention, Substandard, Doubtful, and Loss. Substandard loans include those characterized by well-defined weaknesses and carry the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful, or risk rated eight, have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The final rating of Loss covers loans considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses that deserve management’s close attention, are deemed to be Special Mention. Risk ratings are updated, at a minimum, quarterly.

28

The following tables present gross loans by risk rating: 

	June 30, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,957,152	$	33,347	$	28,071	$	710	$	—	$	2,019,280
Non-owner occupied	1,932,983		20,676		50,727		—		—		2,004,386
Multi-family	188,894		—		1,738		—		—		190,632
Commercial and industrial
Commercial	4,473,382		66,656		36,265		—		—		4,576,303
Leases	173,634		5,793		3,951		—		—		183,378
Construction and land development
Construction	594,752		2,307		—		—		—		597,059
Land	385,659		374		19,606		—		—		405,639
Residential real estate	299,941		2,288		18,362		—		—		320,591
Consumer	23,318		377		258		—		—		23,953
Total	$	10,029,715	$	131,818	$	158,978	$	710	$	—	$	10,321,221

	June 30, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	10,027,949	$	129,876	$	136,627	$	710	$	—	$	10,295,162
Past due 30 - 59 days	1,330		769		299		—		—		2,398
Past due 60 - 89 days	436		1,173		—		—		—		1,609
Past due 90 days or more	—		—		22,052		—		—		22,052
Total	$	10,029,715	$	131,818	$	158,978	$	710	$	—	$	10,321,221

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,664,270	$	28,072	$	39,222	$	1,324	$	—	$	1,732,888
Non-owner occupied	1,771,138		35,752		62,611		440		—		1,869,941
Multi-family	182,180		—		445		—		—		182,625
Commercial and industrial
Commercial	3,295,027		14,380		17,146		155		—		3,326,708
Leases	202,772		2,494		373		—		—		205,639
Construction and land development
Construction	383,677		4,241		481		—		—		388,399
Land	328,278		10,289		21,087		—		—		359,654
Residential real estate	284,052		2,044		13,306		—		—		299,402
Consumer	32,419		233		357		—		—		33,009
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

29

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	8,140,140	$	95,091	$	129,787	$	1,764	$	—	$	8,366,782
Past due 30 - 59 days	2,771		198		4,718		155		—		7,842
Past due 60 - 89 days	385		37		6,445		—		—		6,867
Past due 90 days or more	517		2,179		14,078		—		—		16,774
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

The table below reflects the recorded investment in loans classified as impaired: 

	June 30, 2015			December 31, 2014
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	106,369		$	124,928
Impaired loans without a specific valuation allowance under ASC 310 (2)	44,780			41,822
Total impaired loans	$	151,149		$	166,750
Valuation allowance related to impaired loans (3)	$	(7,157	)	$	(10,765	)

(1) Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

(2) Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

(3) Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

The following table presents impaired loans by class: 

	June 30, 2015		December 31, 2014
	(in thousands)
Commercial real estate
Owner occupied	$	34,336	$	44,893
Non-owner occupied	59,025		66,324
Multi-family	—		—
Commercial and industrial
Commercial	11,806		13,749
Leases	3,930		373
Construction and land development
Construction	—		—
Land	19,117		21,748
Residential real estate	22,611		19,300
Consumer	324		363
Total	$	151,149	$	166,750

A valuation allowance is established for an impaired loan when the fair value of the loan is less than the recorded investment. In certain cases, portions of impaired loans are charged-off to realizable value instead of establishing a valuation allowance and are included, when applicable in the table above as “Impaired loans without a specific valuation allowance under ASC 310.” However, before concluding that an impaired loan needs no associated valuation allowance, an assessment is made to consider all available and relevant information for the method used to evaluate impairment and the type of loan being assessed. The valuation allowance disclosed above is included in the allowance for credit losses reported in the Consolidated Balance Sheets as of June 30, 2015 and December 31, 2014.

30

The following table presents the average investment in impaired loans and income recognized on impaired loans: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Average balance on impaired loans	$	155,943	$	167,326	$	159,186	$	170,010
Interest income recognized on impaired loans	1,126		1,435		2,310		2,821
Interest recognized on non-accrual loans, cash basis	548		566		1,201		1,172

The following table presents average investment in impaired loans by loan class: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	38,750	$	34,341	$	40,839	$	35,545
Non-owner occupied	59,873		68,725		62,636		69,382
Multi-family	—		—		—		—
Commercial and industrial
Commercial	12,401		15,438		12,835		15,510
Leases	4,879		419		2,618		429
Construction and land development
Construction	—		—		—		—
Land	19,834		20,291		20,523		21,438
Residential real estate	19,838		27,607		19,375		27,203
Consumer	368		505		360		503
Total	$	155,943	$	167,326	$	159,186	$	170,010

The average investment in TDR loans included in the average investment in impaired loans table above for the three months ended June 30, 2015 and 2014 was $121.2 million and $123.6 million, respectively, and $123.6 million and $126.6 million for the six months ended June 30, 2015 and 2014, respectively.

The following table presents interest income on impaired loans by class: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	406	$	374	$	827	$	765
Non-owner occupied	360		402		690		775
Multi-family	—		—		—		—
Commercial and industrial
Commercial	60		184		139		377
Leases	—		—		—		—
Construction and land development
Construction	—		—		—		—
Land	197		295		392		556
Residential real estate	102		160		259		317
Consumer	1		20		3		31
Total	$	1,126	$	1,435	$	2,310	$	2,821

The Company is not committed to lend significant additional funds on these impaired loans.

31

The following table summarizes nonperforming assets: 

	June 30, 2015		December 31, 2014
	(in thousands)
Non-accrual loans (1)	$	59,425	$	67,659
Loans past due 90 days or more on accrual status	8,284		5,132
Troubled debt restructured loans (2)	80,192		84,720
Total nonperforming loans	147,901		157,511
Other assets acquired through foreclosure, net	59,335		57,150
Total nonperforming assets	$	207,236	$	214,661

(1) Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

(2) Includes accruing TDR loans only.

Loans Acquired in Bridge Acquisition

The following table presents information regarding the contractually required principal payments receivable, cash flows expected to be collected, and the preliminary estimated fair value of loans acquired in the Bridge acquisition, as of June 30, 2015, the closing date of the transaction:

	June 30, 2015
	Commercial and Industrial		Commercial Real Estate		Construction and Land Development		Residential Real Estate		Consumer		Total
	(in thousands)
Contractually required principal payments:
Loans with credit deterioration since origination	$	10,229	$	1,625	$	—	$	2,455	$	—	$	14,309
Purchased non-credit impaired loans	1,098,965		235,206		99,025		23,797		938		1,457,931
Total loans acquired	1,109,194		236,831		99,025		26,252		938		1,472,240
Cash flows expected to be collected:
Loans with credit deterioration since origination	9,613		1,496		—		2,087		—		13,196
Purchased non-credit impaired loans	1,170,869		302,186		102,018		26,865		1,169		1,603,107
Total loans acquired	1,180,482		303,682		102,018		28,952		1,169		1,616,303
Fair value of loans acquired:
Loans with credit deterioration since origination	8,619		1,480		—		2,075		—		12,174
Purchased non-credit impaired loans	1,082,413		229,470		99,078		23,069		931		1,434,961
Total loans acquired	$	1,091,032	$	230,950	$	99,078	$	25,144	$	931	$	1,447,135

32

Loans Acquired with Deteriorated Credit Quality

Changes in the accretable yield for loans acquired with deteriorated credit quality in the Centennial, Western Liberty, and Bridge acquisitions are as follows: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Balance, at beginning of period	$	17,956		$	26,831		$	19,156		$	28,164
Additions due to acquisition of Bridge	857			—			857			—
Reclassifications from non-accretable to accretable yield (1)	265			1,564			695			3,030
Accretion to interest income	(1,012		)	(1,798		)	(2,090		)	(4,202		)
Reversal of fair value adjustments upon disposition of loans	(876		)	(3,414		)	(1,428		)	(3,809		)
Balance, at end of period	$	17,190		$	23,183		$	17,190		$	23,183

(1) The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

Allowance for Credit Losses

The following table summarizes the changes in the allowance for credit losses by portfolio type: 

	Three Months Ended June 30,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	17,999		$	28,111		$	6,666		$	58,651		$	671		$	112,098
Charge-offs	—			—			(218		)	(1,771		)	(53		)	(2,042		)
Recoveries	1,373			1,738			1,184			681			24			5,000
Provision	165			(903		)	(1,233		)	2,028			(57		)	—
Ending balance	$	19,537		$	28,946		$	6,399		$	59,589		$	585		$	115,056
2014
Beginning Balance	$	16,700		$	34,853		$	11,297		$	39,493		$	1,556		$	103,899
Charge-offs	(78		)	(330		)	(523		)	(1,038		)	(5		)	(1,974		)
Recoveries	498			1,248			314			1,254			191			3,505
Provision	(247		)	(1,422		)	(861		)	3,152			(115		)	507
Ending balance	$	16,873		$	34,349		$	10,227		$	42,861		$	1,627		$	105,937

	Six Months Ended June 30,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
Charge-offs	—			—			(618		)	(2,164		)	(107		)	(2,889		)
Recoveries	1,530			2,121			1,717			1,597			64			7,029
Provision	(551		)	(1,958		)	(2,156		)	5,590			(225		)	700
Ending balance	$	19,537		$	28,946		$	6,399		$	59,589		$	585		$	115,056
2014
Beginning Balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050
Charge-offs	(78		)	(501		)	(929		)	(2,516		)	(17		)	(4,041		)
Recoveries	709			1,808			867			2,176			361			5,921
Provision	1,723			978			(1,351		)	3,544			(887		)	4,007
Ending balance	$	16,873		$	34,349		$	10,227		$	42,861		$	1,627		$	105,937

33

The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment: 

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of June 30, 2015:
Recorded Investment:
Impaired loans with an allowance recorded	$	19,274	$	43,135	$	11,805	$	13,477	$	18,542	$	10	$	126	$	106,369
Impaired loans with no allowance recorded	15,062		15,889		2		9,134		576		3,920		197		44,780
Total loans individually evaluated for impairment	34,336		59,024		11,807		22,611		19,118		3,930		323		151,149
Loans collectively evaluated for impairment	1,967,622		2,068,457		4,555,653		293,200		983,580		179,448		23,630		10,071,590
Loans acquired with deteriorated credit quality	17,322		67,537		8,843		4,780		—		—		—		98,482
Total recorded investment	$	2,019,280	$	2,195,018	$	4,576,303	$	320,591	$	1,002,698	$	183,378	$	23,953	$	10,321,221
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	21,847	$	43,929	$	12,235	$	17,196	$	18,659	$	10	$	139	$	114,015
Impaired loans with no allowance recorded	15,349		15,954		2		10,026		765		4,071		197		46,364
Total loans individually evaluated for impairment	37,196		59,883		12,237		27,222		19,424		4,081		336		160,379
Loans collectively evaluated for impairment	1,967,622		2,068,457		4,555,653		293,200		983,580		179,448		23,630		10,071,590
Loans acquired with deteriorated credit quality	23,124		95,187		11,151		5,852		—		—		—		135,314
Total unpaid principal balance	$	2,027,942	$	2,223,527	$	4,579,041	$	326,274	$	1,003,004	$	183,529	$	23,966	$	10,367,283
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	1,330	$	2,004	$	1,685	$	717	$	1,416	$	1	$	4	$	7,157
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	1,330		2,004		1,685		717		1,416		1		4		7,157
Loans collectively evaluated for impairment	11,684		13,891		55,363		5,682		18,121		2,540		581		107,862
Loans acquired with deteriorated credit quality	—		37		—		—		—		—		—		37
Total allowance for credit losses	$	13,014	$	15,932	$	57,048	$	6,399	$	19,537	$	2,541	$	585	$	115,056

34

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	28,024	$	44,937	$	11,399	$	19,300	$	21,052	$	41	$	175	$	124,928
Impaired loans with no allowance recorded	16,869		21,387		2,350		—		696		332		188		41,822
Total loans individually evaluated for impairment	44,893		66,324		13,749		19,300		21,748		373		363		166,750
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	17,912		75,822		330		2,410		—		—		—		96,474
Total recorded investment	$	1,732,888	$	2,052,566	$	3,326,708	$	299,402	$	748,053	$	205,639	$	33,009	$	8,398,265
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	31,292	$	45,853	$	11,829	$	24,420	$	21,169	$	41	$	187	$	134,791
Impaired loans with no allowance recorded	17,010		21,550		4,104		—		885		483		188		44,220
Total loans individually evaluated for impairment	48,302		67,403		15,933		24,420		22,054		524		375		179,011
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	24,273		108,935		1,150		3,439		—		—		—		137,797
Total unpaid principal balance	$	1,742,658	$	2,086,758	$	3,329,712	$	305,551	$	748,359	$	205,790	$	33,021	$	8,451,849
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	2,082	$	2,537	$	1,926	$	1,052	$	3,112	$	39	$	17	$	10,765
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	2,082		2,537		1,926		1,052		3,112		39		17		10,765
Loans collectively evaluated for impairment	10,198		13,734		49,809		6,404		15,446		2,761		836		99,188
Loans acquired with deteriorated credit quality	174		58		31		—		—		—		—		263
Total allowance for credit losses	$	12,454	$	16,329	$	51,766	$	7,456	$	18,558	$	2,800	$	853	$	110,216

Troubled Debt Restructurings

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. The majority of the Company's modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. A TDR loan is also considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

35

The following table presents information on the financial effects of TDR loans by class for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	—	—		—		—		—		—
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	—	—		—		—		—		—
Consumer	—	—		—		—		—		—
Total	1	$	256	$	—	$	—	$	256	$	—

	Six Months Ended June 30, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	—	—		—		—		—		—
Multi-family	—	—		—		—		—		—
Commercial and industrial		—
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development		—
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	—	—		—		—		—		—
Consumer	—	—		—		—		—		—
Total	1	$	256	$	—	$	—	$	256	$	—

36

	Three Months Ended June 30, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	1	13,423		—		—		13,423		8
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	966		—		—		966		1
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	2	897		281		33		583		7
Consumer	—	—		—		—		—		—
Total	4	$	15,286	$	281	$	33	$	14,972	$	16

	Six Months Ended June 30, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	1	$	798	$	378	$	117	$	303	$	33
Non-owner occupied	1	13,423		—		—		13,423		8
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	2	1,029		—		—		1,029		4
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	3	1,302		447		70		785		7
Consumer	—	—		—		—		—		—
Total	7	$	16,552	$	825	$	187	$	15,540	$	52

37

The following table presents TDR loans by class for which there was a payment default during the period: 

	Three Months Ended June 30,
	2015			2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	1	$	92
Non-owner occupied	—	—		—	—
Multi-family	—	—		—	—
Commercial and industrial
Commercial	—	—		2	306
Leases	—	—		—	—
Construction and land development
Construction	—	—		—	—
Land	—	—		—	—
Residential real estate	1	202		—	—
Consumer	—	—		—	—
Total	1	$	202	3	$	398

	Six Months Ended June 30,
	2015			2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	2	$	395
Non-owner occupied	—	—		—	—
Multi-family	—	—		—	—
Commercial and industrial
Commercial	—	—		3	369
Leases	—	—		—	—
Construction and land development
Construction	1	137		—	—
Land	—	—		—	—
Residential real estate	1	202		1	202
Consumer	—	—		—	—
Total	2	$	339	6	$	966

A TDR loan is deemed to have a payment default when it becomes past due 90 days, goes on non-accrual, or is restructured again. Payment defaults, along with other qualitative indicators, are considered by management in the determination of the allowance for credit losses.

At June 30, 2015, there were no loan commitments outstanding on TDR loans. At December 31, 2014, there was $1.2 million loan commitments outstanding on TDR loans.

Loan Purchases and Sales

For the three months ended June 30, 2015 and 2014, the Company had secondary market loan purchases of $7.7 million and $16.7 million, respectively. For the six months ended June 30, 2015 and 2014, secondary market loan purchases totaled $26.1 million and $32.3 million, respectively. For 2015, these purchased loans consisted of $13.0 million of commercial and industrial loans and $13.1 million of commercial real estate loans. For 2014, these purchased loans consisted of commercial and industrial loans. In addition, the Company periodically acquires newly originated loans at closing through participations or loan syndications.

38

During the six months ended June 30, 2015, the Company sold loans, which primarily consisted of commercial and industrial loans, with a carrying value of $56.3 million and recognized a gain of $0.3 million on the sale. The Company had no significant loan sales in 2014.

5. OTHER ASSETS ACQUIRED THROUGH FORECLOSURE

The following table represents the changes in other assets acquired through foreclosure: 

	Three Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	77,968		$	(14,209	)	$	63,759
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	5,739			—			5,739
Proceeds from sale of other real estate owned and repossessed assets, net	(15,415		)	2,480			(12,935		)
Valuation adjustments, net	—			(718		)	(718		)
Gains, net (1)	1,940			—			1,940
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	72,226		$	(15,776	)	$	56,450
Transfers to other assets acquired through foreclosure, net	4,309			—			4,309
Proceeds from sale of other real estate owned and repossessed assets, net	(1,903		)	683			(1,220		)
Valuation adjustments, net	—			(258		)	(258		)
Gains, net (1)	11			—			11
Balance, end of period	$	74,643		$	(15,351	)	$	59,292
	Six Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	13,459			—			13,459
Proceeds from sale of other real estate owned and repossessed assets, net	(17,703		)	3,328			(14,375		)
Valuation adjustments, net	—			(1,504		)	(1,504		)
Gains, net (2)	3,055			—			3,055
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	6,419			—			6,419
Proceeds from sale of other real estate owned and repossessed assets, net	(21,376		)	6,644			(14,732		)
Valuation adjustments, net	—			(293		)	(293		)
Gains, net (2)	1,179			—			1,179
Balance, end of period	$	74,643		$	(15,351	)	$	59,292

(1) Includes net gains related to initial transfers to other assets of zero during both the three months ended June 30, 2015 and 2014, pursuant to accounting guidance.

(2) Includes net gains related to initial transfers to other assets of $0.6 million and zero during the six months ended June 30, 2015 and 2014, respectively, pursuant to accounting guidance.

39

At June 30, 2015 and December 31, 2014, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 56 properties at June 30, 2015, compared to 67 at December 31, 2014.

6. OTHER BORROWINGS

The following table summarizes the Company’s borrowings as of June 30, 2015 and December 31, 2014: 

	June 30, 2015		December 31, 2014
	(in thousands)
Short-Term:
Revolving line of credit	$	—	$	25,000
FHLB advances	11,051		96,987
Other short-term debt	58,378		58,182
Total short-term borrowings	$	69,429	$	180,169
Long-Term:
FHLB advances	$	—	$	210,094
Total long-term borrowings	$	—	$	210,094

The Company maintains other lines of credit with correspondent banks totaling $70.0 million, of which $25.0 million is secured by pledged securities and $45.0 million is unsecured. As of June 30, 2015, there were no outstanding balances on the Company's lines of credit. At December 31, 2014, the Company had revolving lines of credit with other institutions with outstanding advances totaling $25.0 million, at an interest rate of 1.75%. In addition, the Bank has entered into federal funds credit line agreements with correspondent banks under which it can borrow up to $100.0 million on an unsecured basis. There were no amounts outstanding on these lines of credit as of June 30, 2015 and December 31, 2014. The lending institutions will determine the interest rate charged on funds at the time of the borrowing.

The Company maintains lines of credit with the FHLB and the FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. At June 30, 2015, there were $11.1 million of FHLB advances classified as short-term with a weighted average interest rate of 1.61%. At December 31, 2014, short-term FHLB advances of $97.0 million had a weighted average interest rate of 1.24%.

The Company also has outstanding 10% Senior Notes of $58.4 million at June 30, 2015, maturing in September 2015. The weighted average interest rate on all short-term debt is 8.67% at June 30, 2015, compared to 4.15% at December 31, 2014.

During the second quarter, the Company paid off $200.0 million of FHLB advances classified as long-term for a loss on extinguishment of $0.1 million. As of December 31, 2014, long-term FHLB advances of $210.1 million had a weighted average interest rate of 1.06%.

As of June 30, 2015 and December 31, 2014, the Company had additional available credit with the FHLB of approximately $1.53 billion and $935.0 million, respectively, and with the FRB of approximately $1.63 billion and $1.15 billion, respectively.

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7. QUALIFYING DEBT

Subordinated Debt

On June 29, 2015, the Company issued $150.0 million of subordinated debt, recorded net of debt issuance costs of $1.6 million, maturing July 15, 2025. The subordinated debt has a fixed interest rate of 5.00% through June 30, 2020 and then converts to a variable rate of 3.20% plus three month LIBOR through maturity. To hedge the interest rate risk, the Bank entered into a fair value interest rate hedge with a "pay variable/receive fixed" swap.

Junior Subordinated Debt

The Company has formed or acquired through mergers, eight statutory business trusts, including two new business trusts, Bridge Capital Trust I and Bridge Capital Trust II, acquired in the acquisition of Bridge on June 30, 2015. These trusts exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities. All of the funds raised from the issuance of these securities were passed to the Company and are reflected in the accompanying Consolidated Balance Sheet as junior subordinated debt, with a carrying value of $59.8 million as of June 30, 2015.

The junior subordinated debt has contractual balances and maturity dates as follows: 

Name of Trust	Maturity	June 30, 2015			December 31, 2014
		(in thousands)
BankWest Nevada Capital Trust II	2033	$	15,464		$	15,464
Intermountain First Statutory Trust I	2034	10,310			10,310
First Independent Capital Trust I	2035	7,217			7,217
WAL Trust No. 1	2036	20,619			20,619
WAL Statutory Trust No. 2	2037	5,155			5,155
WAL Statutory Trust No. 3	2037	7,732			7,732
Total contractual balance		66,497			66,497
Unrealized gains on trust preferred securities measured at fair value, net		(18,015		)	(26,060		)
Junior subordinated debt, at fair value		$	48,482		$	40,437
Bridge Capital Trust I	2035	$	12,372		$	—
Bridge Capital Trust II	2037	5,155			—
Total contractual balance		17,527			—
Fair market value adjustment (1)		(6,240		)	—
Junior subordinated debt, assumed from Bridge		$	11,287		$	—
Total junior subordinated debt		$	59,769		$	40,437

(1) The fair market value adjustment will be amortized over the remaining life of the trusts.

Bridge Capital Trust I and Bridge Capital Trust II are statutory trusts created under the laws of the State of Delaware. Interest on the debt securities of Bridge Capital Trust I and Bridge Capital Trust II is payable quarterly at a rate of LIBOR plus 1.98% and LIBOR plus 1.38%, respectively. These debt securities can be redeemed at par at the Company’s option, or if certain events occur that impact the tax or capital treatment of the issuance. The Company owns a 3% minority interest in the each of the trusts.

With the exception of debt issued by Bridge Capital Trust I and Bridge Capital Trust II, junior subordinated debt is recorded at fair value at each reporting date due to the FVO election made by the Company under ASC 825. The Bridge trusts were initially recorded at a fair value of $11.3 million on June 30, 2015, which includes a fair market value adjustment of $6.2 million that will be amortized over the remaining life of the debt. The Company did not make the FVO election for the Bridge trusts. Accordingly, the carrying value of these trusts at each future reporting date will not reflect the fair value of the debt.

Given the pricing of 90 day LIBOR plus 3.20% on the Company's $150.0 million issuance of subordinated debt on June 29, 2015, the Company reviewed the methodology for calculating the estimated fair value of its outstanding junior subordinated debt, which was priced at 30 day LIBOR plus 5.96% as of March 31, 2015 under fair value option accounting.  Considering the significantly lower spread of WAB’s newly issued subordinated debt, that the Company’s debt is junior in subordination, and that the debt was issued by the parent company rather than the insured depository, the Company adjusted the spread for valuation purposes to 30 day LIBOR plus 4.69%, which is between the 90 day LIBOR plus 3.20% rate achieved on the WAB

41

subordinated debt and 30 day LIBOR plus 5.96% rate that was previously used.  This spread reduction resulted in a non-cash, non-recurring debt valuation loss of $7.7 million during the three months ended June 30, 2015. This charge had no effect on regulatory capital.

The weighted average contractual interest rate of all junior subordinated debt was 2.62% and 2.73% as of June 30, 2015 and December 31, 2014, respectively.

In the event of certain changes or amendments to regulatory requirements or federal tax rules, the debt is redeemable in whole. The obligations under these instruments are fully and unconditionally guaranteed by the Company and rank subordinate and junior in right of payment to all other liabilities of the Company. Based on guidance issued by the FRB on July 8, 2013, there will not be a Tier 1 phase out of grandfathered trust preferred securities for banks with assets of less than $15 billion. As such, the Company's securities continue to qualify as Tier 1 Capital.

8. STOCKHOLDERS' EQUITY

Common Stock Issuance

In Connection with Bridge Acquisition

Under the terms of the Bridge merger agreement, each share of Bridge common stock issued and outstanding as of June 30, 2015, the acquisition date, was exchanged for 0.8145 shares of WAL common stock and $2.39 in cash. This resulted in the issuance of 12,451,240 shares, or $420.4 million, of the Company's common stock and payment of $36.5 million in cash.

Under ATM Distribution Agreement

On June 4, 2014, the Company entered into a distribution agency agreement with Credit Suisse Securities (USA) LLC, under which the Company may sell shares of its common stock up to an aggregate offering price of $100.0 million on the New York Stock Exchange. The parties executed an Amended and Restated Distribution Agency Agreement on October 30, 2014. The Company pays Credit Suisse a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares. The common stock will be sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary.

Sales in the ATM offering are being made pursuant to a prospectus dated May 14, 2012 and a prospectus supplement filed with the SEC on June 4, 2014, in connection with one or more offerings of shares from the Company's shelf registration statement on Form S-3 (No. 333-181128). During the three and six months ended June 30, 2015, there were no sales under the ATM offering. During the three and six months ended June 30, 2014, the Company sold 115,866 shares under the ATM offering at a weighted-average selling price of $24.44 per share for gross proceeds of $2.8 million. Total offering costs under the ATM program for the three and six months ended June 30, 2014 were $0.2 million, of which less than $0.1 million relates to compensation costs paid to Credit Suisse Securities.

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Stock-Based Compensation

Equity Awards Assumed in Bridge Acquisition

In connection with the Bridge acquisition, the Company assumed unvested restricted stock awards and stock options originally granted by Bridge and converted them into WAL restricted stock awards and stock options. Bridge equity awards were converted into WAL equity awards at a conversion ratio of 0.905, resulting in the issuance of 546,151 shares of WAL restricted stock and 213,091 of WAL options. The portion of the fair value of these equity awards associated with prior service of Bridge employees represents a component of the total consideration for the Bridge acquisition, which totaled $10.7 million.

Bridge's restricted stock awards generally had an original vesting period of five years. The remaining vesting period of these awards remained unchanged upon conversion. The value of restricted stock replacement awards were based on WAL's stock price as of the acquisition date and totaled $17.0 million as of June 30, 2015, of which $9.0 million is considered purchase price consideration for pre-combination service and $8.0 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the awards.

Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06

The total value of assumed stock options as of June 30, 2015 totaled $4.1 million, of which $1.7 million is considered purchase price consideration for pre-combination service and $2.3 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the options.

Restricted Stock

For the three and six months ended June 30, 2015, 44,975 and 335,975 shares of restricted stock that generally vest over three years were granted to Company employees and 64,000 shares of restricted stock that were fully vested at June 30, 2015 were granted to non-employee WAL and WAB directors. The Company estimates the compensation cost for restricted stock grants based upon the grant date fair value. The aggregate grant date fair value for the restricted stock issued during the three and six months ended June 30, 2015 was $1.4 million and $10.9 million, respectively. For the three and six months ended June 30, 2015, the Company recognized $2.6 million and $5.1 million, respectively, in stock-based compensation expense related to these restricted stock grants, compared to $1.9 million and $3.6 million, respectively, in stock-based compensation expense for the three and six months ended June 30, 2014.

In addition, the Company granted 52,200 shares of restricted stock to certain members of executive management that have both performance and service conditions that affect vesting. The performance condition is based on achieving an EPS target for fiscal year 2015 and, if this target is met, the restricted stock awards will vest over a three-year service period. Assuming the EPS target is met, the grant date fair value of the awards was $1.4 million. For the three and six months ended June 30, 2015, the Company recognized $0.1 million and $0.2 million, respectively, in stock-based compensation expense related to these restricted stock grants. There was no related stock-based compensation expense for the three and six months ended June 30, 2014.

There were approximately 1.5 million and 1.1 million restricted shares outstanding at June 30, 2015 and December 31, 2014, respectively.

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Performance Stock Units

The Company grants executive management committee members performance stock units that do not vest unless the Company achieves a specified cumulative EPS target over a three-year performance period. The number of shares issued will vary based on the cumulative EPS target that is achieved. The Company estimates the cost of performance stock units based upon the grant date fair value and expected vesting percentage over the three-year performance period. For the three and six months ended June 30, 2015, the Company recognized $1.0 million and $2.0 million, respectively, in stock-based compensation expense related to these performance stock units, compared to $0.7 million and $1.5 million, respectively, in stock-based compensation expense for the three and six months ended June 30, 2014.

The first three-year performance period ended on December 31, 2014, and the Company's cumulative EPS for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, on February 18, 2015, executive management committee members were granted 285,000 of fully vested common shares.

As of June 30, 2015, outstanding performance stock unit grants made in 2013 and 2014 are expected to pay out at the maximum award amount, or 514,450 common shares. In January 2015, performance stock units were granted to executive management committee members with cumulative target awards equivalent to 104,300 shares of common stock. Assuming a 100% vesting percentage for the 2015 performance stock units, the grant date fair value of the awards was $2.8 million.

9. ACCUMULATED OTHER COMPREHENSIVE INCOME

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Three Months Ended June 30,
	2015										2014
	Unrealized holding gains (losses) on AFS			Unrealized holding gains on SERP		Impairment loss on securities		Total			Unrealized holding gains (losses) on AFS			Impairment loss on securities		Total
	(in thousands)
Beginning Balance	$	23,279		$	—	$	144	$	23,423		$	(11,275	)	$	144	$	(11,131	)
SERP assumed in Bridge acquisition	—			337		—		337			—			—		—
Transfer of HTM securities to AFS	—			—		—		—			8,976			—		8,976
Other comprehensive (loss) income before reclassifications	(8,378		)	—		—		(8,378		)	10,525			—		10,525
Amounts reclassified from accumulated other comprehensive income	(34		)	—		—		(34		)	102			—		102
Net current-period other comprehensive (loss) income	(8,412		)	337		—		(8,075		)	19,603			—		19,603
Ending Balance	$	14,867		$	337	$	144	$	15,348		$	8,328		$	144	$	8,472

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	Six Months Ended June 30,
	2015										2014
	Unrealized holding gains (losses) on AFS			Unrealized holding gains on SERP		Impairment loss on securities		Total			Unrealized holding gains (losses) on AFS			Impairment loss on securities		Total
	(in thousands)
Beginning Balance	$	16,495		$	—	$	144	$	16,639		$	(21,690	)	$	144	$	(21,546	)
SERP assumed in Bridge acquisition	—			337		—		337
Transfer of HTM securities to AFS	—			—		—		—			8,976			—		8,976
Other comprehensive (loss) income before reclassifications	(1,225		)	—		—		(1,225		)	21,169			—		21,169
Amounts reclassified from accumulated other comprehensive income	(403		)	—		—		(403		)	(127		)	—		(127		)
Net current-period other comprehensive (loss) income	(1,628		)	337		—		(1,291		)	30,018			—		30,018
Ending Balance	$	14,867		$	337	$	144	$	15,348		$	8,328		$	144	$	8,472

The following table presents reclassifications out of accumulated other comprehensive income (loss): 

	Three Months Ended June 30,						Six Months Ended June 30,
Income Statement Classification	2015			2014			2015			2014
	(in thousands)
Gain (loss) on sales of investment securities, net	$	55		$	(163	)	$	644		$	203
Income tax expense	(21		)	61			(241		)	(76		)
Net of tax	$	34		$	(102	)	$	403		$	127

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10. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments through its subsidiary, WAB. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary type of derivatives that the Company uses are interest rate swaps. Generally, these instruments are used to help manage the Company's exposure to interest rate risk and meet client financing and hedging needs.

Derivatives are recorded at fair value in the Consolidated Balance Sheets, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

As of June 30, 2015, December 31, 2014, and June 30, 2014, the Company does not have any significant outstanding cash flow hedges or free-standing derivatives.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) to another interest rate index.

The Company designates its “pay fixed/receive variable” interest rate swaps as fair value hedges. These contracts convert certain fixed-rate long-term loan assets into variable-rate assets, thereby modifying the Company's exposure to changes in interest rates. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts.

During the three months ended June 30, 2015, the Company entered into a "pay variable/receive fixed" interest rate swap agreement to hedge the interest rate exposure on its subordinated debt issuance. As a result, the Company is paying a floating rate of 3 month LIBOR plus 3.16% and receiving semi-annual fixed payments of 5.00% to match the payments on the debt.

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Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair values of the Company's derivative instruments on a gross and net basis as of June 30, 2015, December 31, 2014, and June 30, 2014. The change in the notional amounts of these derivatives from December 31, 2014 to June 30, 2015 indicates the volume of the Company's derivative transaction activity during 2015. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties. The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities in the Consolidated Balance Sheets, as indicated in the following table:

	June 30, 2015						December 31, 2014						June 30, 2014
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in thousands)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate swaps	$	828,036	$	198	$	49,037	$	647,703	$	7	$	57,820	$	568,006	$	2	$	29,129
Total	828,036		198		49,037		647,703		7		57,820		568,006		2		29,129
Netting adjustments (1)	—		—		—		—		—		—		—		2		2
Net derivatives in the balance sheet	$	828,036	$	198	$	49,037	$	647,703	$	7	$	57,820	$	568,006	$	—	$	29,127

(1) Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

Fair value hedges

An assessment of effectiveness is performed at both initiation of a hedge and on a quarterly basis thereafter. All of the Company's fair value hedges remained “highly effective” as of June 30, 2015, December 31, 2014, and June 30, 2014.

The following table summarizes the pre-tax net gains (losses) on fair value hedges for the three and six months ended June 30, 2015 and June 30, 2014 and where they are recorded in the income statement.

	Three Months Ended June 30,
	2015					2014
Income Statement Classification	Net Gain (Loss) on Derivatives		Increase (Decrease) to Basis of Hedged Asset/Liability (a)			Net Gain (Loss) on Derivatives			Increase (Decrease) to Basis of Hedged Asset/Liability (a)
	(in thousands)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	$	24,201	$	(24,186	)	$	(16,635	)	$	16,795
	Six Months Ended June 30,
	2015					2014
Income Statement Classification	Net Gain (Loss) on Derivatives		Increase (Decrease) to Basis of Hedged Asset/Liability (a)			Net Gain (Loss) on Derivatives			Increase (Decrease) to Basis of Hedged Asset/Liability (a)
	(in thousands)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	$	8,971	$	(8,950	)	$	(31,774	)	$	31,570

(a) Net gain (loss) on loans represent the change in fair value caused by fluctuations in interest rates; differences relate to ineffectiveness associated with the fair value hedge.

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Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected positive replacement value of the contracts. Management generally enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types. In general, the Company has a zero credit threshold with regard to derivative exposure with counterparties. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally holds collateral in the form of highly rated securities issued by the U.S. Treasury or government-sponsored enterprises, such as GNMA, FNMA, and FHLMC. The total collateral netted against net derivative liabilities totaled $46.7 million at June 30, 2015, $57.8 million at December 31, 2014, and $29.2 million at June 30, 2014.

The following table summarizes our largest exposure to an individual counterparty at the dates indicated:

	June 30, 2015		December 31, 2014		June 30, 2014
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	198	$	7	$	2
Collateral posted by this counterparty	—		—		—
Derivative liability with this counterparty	—		—		28,874
Collateral pledged to this counterparty	—		—		28,872
Net exposure after netting adjustments and collateral	$	198	$	7	$	—

Credit Risk Contingent Features

Management has entered into certain derivative contracts that require the Company to post collateral to the counterparties when these contracts are in a net liability position. Conversely, the counterparties post collateral when these contracts are in a net asset position. The amount of collateral to be posted is based on the amount of the net liability and exposure thresholds. As of June 30, 2015, December 31, 2014, and June 30, 2014 the aggregate fair value of all derivative contracts with credit risk contingent features (i.e., those containing collateral posting provisions) held by the Company that were in a net liability position totaled $49.0 million, $57.8 million, and $29.1 million, respectively. As of June 30, 2015, the Company was in an over-collateralized net position of $18.0 million after considering $64.6 million of collateral held in the form of securities. As of December 31, 2014 and June 30, 2014, the Company was in an over-collateralized position of $14.2 million and $17.5 million, respectively.

11. EARNINGS PER SHARE

Diluted EPS is based on the weighted average outstanding common shares during each period, including common stock equivalents. Basic EPS is based on the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Weighted average shares - basic	88,177		86,501		88,059		86,379
Dilutive effect of stock awards	505		832		508		850
Weighted average shares - diluted	88,682		87,333		88,567		87,229
Net income available to common stockholders	$	34,472	$	35,186	$	74,486	$	65,918
Earnings per share - basic	0.39		0.41		0.85		0.76
Earnings per share - diluted	0.39		0.40		0.84		0.76

The Company had zero and 1,500 stock options outstanding as of June 30, 2015 and December 31, 2014, respectively, that were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive.

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12. INCOME TAXES

The effective tax rate was 23.39% and 22.90% for the three months ended June 30, 2015 and 2014, respectively. For the six months ended June 30, 2015 and 2014, the Company's effective tax rate was 24.81%, and 23.94%, respectively. The increase in the effective tax rate is due primarily to proportionately lower tax-exempt income, increased state taxes, and a decrease in the amount of valuation allowance that will be released during 2015.

As of June 30, 2015, there is $0.5 million recorded for unrecognized tax benefits, all of which carried over from the Bridge acquisition. Management believes that this recorded liability for unrecognized tax benefits is adequate. The Company estimates that it is reasonably possible that the entire liability for unrecognized tax benefits will be settled within the next twelve months.

Interest and penalties related to unrecognized tax benefits are recognized in the provision for income taxes. As of June 30, 2015, a liability has not been recorded for interest or penalties. All of the Company's unrecognized tax benefits relate to legacy Bridge positions. Therefore, all amounts of interest and penalties through June 30, 2015 were recorded in the pre-acquisition period.

Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be reversed. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

For the six months ended June 30, 2015, the net deferred tax assets increased$19.4 million to $82.1 million. This overall increase in the net deferred tax asset was primarily the result of the Bridge acquisition and an increase in the allowance for credit losses.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $82.1 million at June 30, 2015 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies within the meaning of ASC 740, Income Taxes, that could be implemented if necessary to prevent a carryover from expiring.

As of June 30, 2015 and December 31, 2014, the Company had a $1.1 million and $1.8 million, respectively, deferred tax valuation allowance related to net capital loss carryovers from the sale of preferred stock investments and $0.5 million, for both periods, related to IRC Section 382 limitations associated with the Company's acquisition of Western Liberty.

The deferred tax asset related to federal and state NOL carryovers outstanding at June 30, 2015 and December 31, 2014 available to reduce the tax liability in future years totaled $8.5 million. The entire $8.5 million of tax benefits relate to federal NOL carryovers (subject to an annual limitation imposed by IRC Section 382). The Company’s ability to use federal NOL carryovers, as well as its ability to use certain future tax deductions called NUBILs associated with the Company's acquisitions of Western Liberty and Centennial, will be subject to separate annual limitations of $1.8 million and $1.6 million of deductions from taxable income, respectively. In management’s opinion, it is more-likely-than-not that the results of future operations will generate sufficient taxable income to realize all but $0.5 million of the deferred tax benefits related to these NOL carryovers and NUBILs.

Investments in LIHTC

The Company invests in LIHTC funds that are designed to generate a return primarily through the realization of federal tax credits.

Investments in LIHTC and unfunded LIHTC obligations are included as part of other assets and other liabilities, respectively, in the Consolidated Balance Sheets and total $126.9 million and $43.8 million, respectively, as of June 30, 2015. For the three months ended June 30, 2015 and 2014, $2.2 million and $3.3 million of amortization related to LIHTC investments was recognized as a component of current income tax expense, respectively. For the six months ended June 30, 2015 and 2014, $5.6 million and $6.3 million of amortization related to LIHTC investments was recognized as a component of income tax expense, respectively.

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13. COMMITMENTS AND CONTINGENCIES

Unfunded Commitments and Letters of Credit

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheets.

Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of standby letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the standby letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.

Standby letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within 1 year.

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	June 30, 2015		December 31, 2014
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $358,971 at June 30, 2015 and $232,863 at December 31, 2014	$	3,230,537	$	2,164,523
Credit card commitments and financial guarantees	57,452		42,038
Standby letters of credit, including unsecured letters of credit of $33,485 at June 30, 2015 and $5,166 at December 31, 2014	73,513		49,556
Total	$	3,361,502	$	2,256,117

Commitments to extend credit are agreements to lend to a customer provided that there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are not included in the allowance for credit losses reported in "Note 4. Loans, Leases and Allowance for Credit Losses" of these Unaudited Consolidated Financial Statements and are accounted for as a separate loss contingency. This loss contingency for unfunded loan commitments and letters of credit was $2.1 million as of June 30, 2015 and December 31, 2014. Changes to this liability are adjusted through non-interest expense.

Concentrations of Lending Activities

The Company’s lending activities are driven in large part by the customers served in the market areas where the Company has branch offices in the states of Arizona, Nevada, and California. Despite the geographic concentration of lending activities, the Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations within five broad categories: geography, industry, product, call report classifications, and collateral. The Company's loan portfolio includes significant credit exposure to the CRE market. As of June 30, 2015 and December 31, 2014, CRE related loans accounted for approximately 51% and 54% of total loans, respectively. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 48% and 46% of these CRE loans, excluding construction and land loans, were owner-occupied at June 30, 2015 and December 31, 2014, respectively.

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Contingencies

The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.

Lease Commitments

The Company leases the majority of its office locations and many of these leases contain multiple renewal options and provisions for increased rents. Total rent expense of $1.6 million and $1.7 million was included in occupancy expenses for the three months ended June 30, 2015 and 2014, respectively. For the six months ended June 30, 2015 and 2014, total rent expense was $3.2 million and $3.3 million, respectively.

14. FAIR VALUE ACCOUNTING

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels in the fair value hierarchy are recognized as of the end of the month following the event or change in circumstances that caused the transfer.

Under ASC 825, the Company elected the FVO treatment for junior subordinated debt issued by WAL. This election is irrevocable and unrealized gains and losses on these items must be reported in earnings at each reporting date. The Company did not elect FVO treatment for newly assumed Bridge junior subordinated debt.

All securities for which the fair value measurement option had been elected are included in a separate line item in the Consolidated Balance Sheet as securities measured at fair value.

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For the three and six months ended June 30, 2015 and 2014, gains and losses from fair value changes included in the Consolidated Income Statements were as follows: 

	Changes in Fair Values for Items Measured at Fair Pursuant to Election of the Fair Value Option
	Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net			Interest Income on Securities		Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings
	(in thousands)
Three Months Ended June 30, 2015
Securities measured at fair value	$	(9	)	$	1	$	—		$	(8	)
Junior subordinated debt	(7,736		)	—		451			(7,285		)
Total	$	(7,745	)	$	1	$	451		$	(7,293	)
Six Months Ended June 30, 2015
Securities measured at fair value	$	(14	)	$	1	$	—		$	(13	)
Junior subordinated debt	(8,045		)	—		892			(7,153		)
Total	$	(8,059	)	$	1	$	892		$	(7,166	)
Three Months Ended June 30, 2014
Securities measured at fair value	$	(2	)	$	1	$	—		$	(1	)
Junior subordinated debt	125			—		(443		)	(318		)
Total	$	123		$	1	$	(443	)	$	(319	)
Six Months Ended June 30, 2014
Securities measured at fair value	$	16		$	2	$	—		$	18
Junior subordinated debt	(853		)	—		(864		)	(1,717		)
Total	$	(837	)	$	2	$	(864	)	$	(1,699	)

There were no net gains or losses recognized during the three and six months ended June 30, 2015 and 2014 on trading securities sold during the period.

Interest income on securities measured at fair value is accounted for similarly to those classified as AFS. Any premiums or discounts are recognized in interest income over the term of the securities. For MBS, estimates of prepayments are considered in the constant yield calculations. Interest expense on junior subordinated debt is also determined under a constant yield calculation.

Fair value on a recurring basis

Financial assets and financial liabilities measured at fair value on a recurring basis include the following:

Securities measured at fair value: All of the Company’s securities measured at fair value, which consist of MBS, are reported at fair value utilizing Level 2 inputs in the same manner as described below for AFS securities.

AFS securities: Preferred stock, mutual funds, and CRA investments are reported at fair value utilizing Level 1 inputs. With the exception of CDO securities, other securities classified as AFS are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things. The Company estimates the fair value of CDO securities utilizing Level 3 inputs, which include pricing indications from comparable securities.

Independent pricing service: Our independent pricing service provides pricing information on Level 1, 2, and 3 securities, and represents the pricing source for the majority of the portfolio. Management independently evaluates the fair value measurements received from the Company's third party pricing service through multiple review steps. First, management reviews what has transpired in the marketplace with respect to interest rates, credit spreads, volatility, and mortgage rates, among other things, and develops an expectation of changes to the securities valuations from the previous quarter. Then, management obtains market values from additional sources. The pricing service provides management with observable market data including interest rate curves and mortgage prepayment speed grids, as well as dealer quote sheets, new bond offering sheets, and historical trade documentation. Management reviews the assumptions and decides whether they are reasonable. Management may compare interest rates, credit spreads and prepayments speeds used as part of the assumptions to those that

52

management believes are reasonable. Management may price securities using the provided assumptions to determine whether they can develop similar prices on like securities. Any discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and the Company’s other valuation advisors. Last, management selects a sample of investment securities and compares the values provided by its primary third party pricing service to the market values obtained from secondary sources and evaluates those with notable variances.

Annually, the Company receives an SSAE 16 report from its independent pricing service attesting to the controls placed on the operations of the service from its auditor.

Interest rate swaps: Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps.

Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions are based on contractual cash flows as the Company anticipates that it will pay the debt according to its contractual terms.

Given the pricing of 90 day LIBOR plus 3.20% on the Company's $150.0 million issuance of subordinated debt on June 29, 2015, the Company reviewed the methodology for calculating the estimated fair value of its outstanding junior subordinated debt, which was priced at 30 day LIBOR plus 5.96% as of March 31, 2015 under fair value option accounting.  Considering the significantly lower spread of WAB’s newly issued subordinated debt, that the Company’s debt is junior in subordination, and that the debt was issued by the parent company rather than the insured depository, the Company adjusted the spread for valuation purposes to 30 day LIBOR plus 4.69%, which is between the 90 day LIBOR plus 3.20% rate achieved on the WAB subordinated debt and 30 day LIBOR plus 5.96% rate that was previously used.  This spread reduction resulted in a non-cash, non-recurring debt valuation loss of $7.7 million during the three months ended June 30, 2015. This charge had no effect on regulatory capital.

As of June 30, 2015, the Company estimated the discount rate at 4.972%, which represents the implied credit spread of the BB Financial curve, and is a 4.69% spread plus 3 month LIBOR (0.283%). As of December 31, 2014, the Company estimated the discount rate at 6.242%, which was a 5.99% spread plus 3 month LIBOR of 0.256%.

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The fair value of assets and liabilities measured at fair value on a recurring basis were determined using the following inputs as of the periods presented: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
June 30, 2015
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,701	$	—	$	1,701
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	10,804	$	10,804
Commercial MBS issued by GSEs	11,126		2,083		—		13,209
Corporate debt securities	326		13,339		—		13,665
CRA investments	32,537		—		—		32,537
Municipal obligations	1,235		291,178		—		292,413
Preferred stock	83,051		—		—		83,051
Private label commercial MBS	—		4,979		—		4,979
Private label residential MBS	31,527		70,544		—		102,071
Residential MBS issued by GSEs	—		871,357		—		871,357
Trust preferred securities	—		25,648		—		25,648
U.S. government sponsored agency securities	6,206		18,403		—		24,609
U.S. treasury securities	3,891		—		—		3,891
Total AFS securities	$	169,899	$	1,297,531	$	10,804	$	1,478,234
Derivative assets (1)	$	—	$	198	$	—	$	198
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	48,482	$	48,482
Derivative liabilities (1)	—		49,037		—		49,037

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $48,258 as of June 30, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

(2) Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

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	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2014
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	1,858
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	11,445	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		2,147
Corporate debt securities	—		52,489		—		52,489
CRA investments	24,332		—		—		24,332
Municipal obligations	—		299,037		—		299,037
Mutual funds	37,702		—		—		37,702
Preferred stock	82,612		—		—		82,612
Private label commercial MBS	—		5,149		—		5,149
Private label residential MBS	—		70,243		—		70,243
Residential MBS issued by GSEs	—		891,189		—		891,189
Trust preferred securities	—		25,546		—		25,546
U.S. government sponsored agency securities	—		18,346		—		18,346
Total AFS securities	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Derivative assets (1)	$	—	$	7	$	—	$	7
Liabilities:
Junior subordinated debt	$	—	$	—	$	40,437	$	40,437
Derivative liabilities (1)	—		57,820		—		57,820

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

For the three and six months ended June 30, 2015 and 2014, the change in Level 3 assets and liabilities measured at fair value on a recurring basis was as follows: 

	Junior Subordinated Debt
	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Beginning balance	$	(40,746	)	$	(42,836	)	$	(40,437	)	$	(41,858	)
Transfers into Level 3	—			—			—			—
Total gains (losses) for the period
Included in earnings (1)	(7,736		)	125			(8,045		)	(853		)
Ending balance	$	(48,482	)	$	(42,711	)	$	(48,482	)	$	(42,711	)
Change in unrealized gains (losses) for the period included in earnings	$	(7,736	)	$	125		$	(8,045	)	$	(853	)

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	CDO Securities
	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015			2014
	(in thousands)
Beginning balance	$	10,520	$	—	$	11,445		$	—
Transfers into Level 3	—		58		—			58
Total gains (losses) for the period
Included in other comprehensive income (2)	284		—		$	(641	)	$	—
Ending balance	$	10,804	$	58	$	10,804		$	58

(1) Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

(2) Total gains (losses) for the period are included in the other comprehensive income line, Unrealized (loss) gain on AFS securities.

For Level 3 liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014, the significant unobservable inputs used in the fair value measurements were as follows: 

	June 30, 2015		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	48,482	Discounted cash flow	Implied credit rating of the Company
CDO securities	10,804		S&P Model	Pricing indications from comparable securities

	December 31, 2014		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	40,437	Discounted cash flow	Adjusted Corporate Bond over Treasury Index with comparable credit spread
CDO securities	11,445		S&P Model	Pricing indications from comparable securities

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of June 30, 2015 was the BB Financial over SWAP index and as of December 31, 2014 was the BB 20-Year over Treasury Index with comparable credit spread. The input value used in the fair value measurement of the Company's junior subordinated debt was 4.972% and 6.242% as of June 30, 2015 and December 31, 2014, respectively.

The significant unobservable inputs used in the fair value measurement of the Company's CDO securities include securities terms, conditions, and underlying collateral type, as well as trustee and servicer reports, trade data on comparable securities, and market quotes that are converted into spreads to benchmark LIBOR curves. Significant increases or decreases in these inputs could result in significantly different fair value measurements.

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Fair value on a nonrecurring basis

Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in thousands)
As of June 30, 2015:
Impaired loans with specific valuation allowance	$	99,212	$	—	$	—	$	99,212
Impaired loans without specific valuation allowance (1)	38,010		—		—		38,010
Other assets acquired through foreclosure	59,335		—		—		59,335
As of December 31, 2014:
Impaired loans with specific valuation allowance	$	114,163	$	—	$	—	$	114,163
Impaired loans without specific valuation allowance (1)	38,019		—		—		38,019
Other assets acquired through foreclosure	57,150		—		—		57,150

(1) Excludes loan balances with charge-offs of $6.8 million and $3.8 million as of June 30, 2015 and December 31, 2014, respectively.

Impaired loans: The specific reserves for collateral dependent impaired loans are based on collateral value, net of estimated disposition costs and other identified quantitative inputs. Collateral value is determined based on third-party appraisals. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser. Therefore, qualifying the assets as Level 3 in the fair value hierarchy. In some cases, adjustments are made to the appraised values due to various factors, including age of the appraisal (which are generally obtained every twelve months), age of comparables included in the appraisal, and known changes in the market and in the collateral. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. These Level 3 impaired loans had an estimated fair value of $106.4 million and $124.9 million at June 30, 2015 and December 31, 2014, respectively. The fair value of these Level 3 impaired loans reflects the carrying value of loan, which has been reduced by any deficit in appraised value compared to book value, estimated disposition costs, and estimated losses of similar impaired loans based on historical loss experience. Specific reserves in the allowance for loan losses for these loans were $7.2 million and $10.8 million at June 30, 2015 and December 31, 2014, respectively.

Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. These assets are initially reported at the fair value determined by independent appraisals using appraised value less estimated cost to sell. Such properties are generally re-appraised every twelve months. There is risk for subsequent volatility. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense. The Company had $59.3 million of such assets at June 30, 2015. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser; therefore, qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement.

Credit vs. non-credit losses

Under the provisions of ASC 320, Investments-Debt and Equity Securities, OTTI is separated into the amount of total impairment related to the credit loss and the amount of the total impairment related to all other factors. The amount of the total OTTI related to the credit loss is recognized in earnings. The amount of the total impairment related to all other factors is recognized in OCI.

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For the three and six months ended June 30, 2015 and 2014, the Company determined that no securities experienced credit losses.

There is no OTTI balance recognized in comprehensive income as of June 30, 2015 and 2014.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair value of the Company’s financial instruments is as follows: 

	June 30, 2015
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,478,234	$	169,899	$	1,297,531	$	10,804	$	1,478,234
Trading	1,701		—		1,701		—		1,701
Derivative assets	198		—		198		—		198
Loans, net	10,245,566		—		9,891,399		137,222		10,028,621
Accrued interest receivable	46,222		—		46,222		—		46,222
Financial liabilities:
Deposits	$	11,406,728	$	—	$	11,410,560	$	—	$	11,410,560
Customer repurchases	42,172		—		42,172		—		42,172
FHLB and FRB advances	11,051		—		11,051		—		11,051
Other borrowed funds	58,378		—		—		58,637		58,637
Qualifying debt	208,417		—		—		209,019		209,019
Derivative liabilities	49,037		—		49,037		—		49,037
Accrued interest payable	11,764		—		11,764		—		11,764

	December 31, 2014
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,520,237	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Trading	1,858		—		1,858		—		1,858
Derivative assets	7		—		7		—		7
Loans, net	8,288,049		—		7,984,692		152,182		8,136,874
Accrued interest receivable	36,705		—		36,705		—		36,705
Financial liabilities:
Deposits	$	8,931,043	$	—	$	8,935,566	$	—	$	8,935,566
Customer repurchases	54,899		—		54,899		—		54,899
FHLB and FRB advances	307,081		—		307,081		—		307,081
Other borrowed funds	83,182		—		25,000		61,074		86,074
Junior subordinated debt	40,437		—		—		40,437		40,437
Derivative liabilities	57,820		—		57,820		—		57,820
Accrued interest payable	9,890		—		9,890		—		9,890

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Interest rate risk

The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments as well as its future net interest income will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.

Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in EVE and net interest income resulting from hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within BOD-approved limits. As of June 30, 2015, the Company’s interest rate risk profile was within BOD-approved limits.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to prohibit an interest rate risk profile that does not conform to both management and BOD risk tolerances. There is also ALCO reporting at the Parent company level for reviewing interest rate risk for the Company, which gets reported to the BOD and the Finance and Investment Committee.

Fair value of commitments

The estimated fair value of standby letters of credit outstanding at June 30, 2015 and December 31, 2014 was insignificant. Loan commitments on which the committed interest rates were less than the current market rate were also insignificant at June 30, 2015 and December 31, 2014.

15. REGULATORY CAPITAL REQUIREMENTS

The Company and WAB are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and WAB must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of common equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets.

59

As of June 30, 2015 and December 31, 2014, the Company and WAB exceeded the capital levels necessary to be classified as well-capitalized, as defined by the federal banking agencies. The actual capital amounts and ratios for the Company and WAB are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
June 30, 2015
WAL	$	1,522,991	$	1,269,033	$	12,435,603	$	12,733,458	12.2	%	10.2	%	10.0	%	9.1	%
WAB	1,408,273		1,142,684		12,326,696		12,549,292		11.4		9.3		9.1		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

16. SEGMENTS

The Company's reportable segments are aggregated primarily based on geographic location, services offered, and markets served. As a result of the Bridge acquisition on June 30, 2015, former Bridge activities were allocated between the newly formed Northern California segment and the CBL segment. As a substantial portion of Bridge's balance sheet is generated from nationally-focused business lines, the Technology and Energy Infrastructure lines of Bridge's business are included in the CBL segment. Substantially all of the remaining assets and liabilities are included in the Northern California segment. The Southern California segment represents legacy Western Alliance operations in California, excluding two branches located in northern California, which are now included in the Northern California segment. Prior period amounts have been adjusted accordingly.

The Arizona, Nevada, Southern California, and Northern California segments provide full service banking and related services to their respective markets although operations may not be domiciled in these states. The Company's CBL segment provides banking services to niche markets and, as of June 30, 2015, includes the Technology and Energy Infrastructure operations of Bridge. These CBLs are managed centrally and are broader in geographic scope, though still predominately within the Company's core market areas. The Corporate & Other segment primarily relates to our Treasury division and also includes other corporate-related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 12% during the year, with a funds credit provided for the use of this equity as a funding source. Any excess equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segment to the extent that the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment.

Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average life of the assets or liabilities in the portfolio.

Net income amounts for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, average loan balances, and average deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing.

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Income taxes are applied to each segment based on the effective tax rate for the geographic location of the segment. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

As the Bridge acquisition was completed on June 30, 2015, the balance sheet data of Bridge is included in the Company's Consolidated Balance Sheet as of June 30, 2015. However, the results of operations of Bridge will be included in the Company's Consolidated Income Statements beginning on July 1, 2015. Accordingly, the results of operations of the Northern California segment for the three and six months ended June 30, 2015 and 2014 only include the operations of the Company's two previously existing Northern California branch offices.

The following is a summary of selected operating segment information as of June 30, 2015, December 31, 2014, and June 30, 2014 and for the three and six months ended June 30, 2015 and 2014.

	Arizona			Nevada			Southern California			Northern California (1)			Central Business Lines (1)			Corporate & Other (1)			Consolidated Company
At June 30, 2015	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	10.2		$	2.6		$	2.1		$	—		$	2,273.0		$	2,290.2
Loans, net of deferred loan fees and costs	2,432.8			1,761.9			1,659.9			1,077.5			3,388.0			40.5			10,360.6
Less: allowance for credit losses	(31.4		)	(22.8		)	(21.4		)	(3.2		)	(35.7		)	(0.6		)	(115.1		)
Total loans	2,401.4			1,739.1			1,638.5			1,074.3			3,352.3			39.9			10,245.5
Other assets acquired through foreclosure, net	18.6			23.4			—			1.6			—			15.7			59.3
Goodwill and other intangible assets, net	—			25.4			—			155.2			119.4			—			300.0
Other assets	43.8			63.0			13.7			15.7			29.1			409.8			575.1
Total assets	$	2,466.1		$	1,861.1		$	1,654.8		$	1,248.9		$	3,500.8		$	2,738.4		$	13,470.1
Liabilities:
Deposits	$	2,369.9		$	3,316.9		$	1,946.8		$	1,550.2		$	1,945.1		$	277.8		$	11,406.7
Borrowings and qualifying debt	—			—			—			—			—			277.8			277.8
Other liabilities	20.3			29.2			3.5			8.4			77.6			131.9			270.9
Total liabilities	2,390.2			3,346.1			1,950.3			1,558.6			2,022.7			687.5			11,955.4
Allocated equity:	267.6			244.9			182.1			281.5			409.8			128.8			1,514.7
Total liabilities and stockholders' equity	$	2,657.8		$	3,591.0		$	2,132.4		$	1,840.1		$	2,432.5		$	816.3		$	13,470.1
Excess funds provided (used)	191.7			1,729.9			477.6			591.2			(1,068.3		)	(1,922.1		)	—

(1)    Includes Bridge balances.

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	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	5.0		$	2.2		$	0.3		$	—		$	1,702.4		$	1,712.2
Loans, net of deferred loan fees and costs	2,341.9			1,668.7			1,553.1			198.6			2,590.0			46.0			8,398.3
Less: allowance for credit losses	(30.7		)	(21.9		)	(17.9		)	(5.1		)	(34.0		)	(0.6		)	(110.2		)
Total loans	2,311.2			1,646.8			1,535.2			193.5			2,556.0			45.4			8,288.1
Other assets acquired through foreclosure, net	15.5			21.0			—			—			—			20.6			57.1
Goodwill and other intangible assets, net	—			25.9			—			—			—			—			25.9
Other assets	34.8			64.2			6.2			15.3			22.9			373.8			517.2
Total assets	$	2,363.8		$	1,762.9		$	1,543.6		$	209.1		$	2,578.9		$	2,142.2		$	10,600.5
Liabilities:
Deposits	$	2,178.0		$	3,230.6		$	1,744.5		$	584.0		$	946.6		$	247.3		$	8,931.0
Other borrowings	—			—			—			—			—			390.3			390.3
Other liabilities	17.4			40.8			8.9			0.2			72.4			138.6			278.3
Total liabilities	2,195.4			3,271.4			1,753.4			584.2			1,019.0			776.2			9,599.6
Allocated equity:	250.8			209.0			70.9			126.8			232.9			110.5			1,000.9
Total liabilities and stockholders' equity	$	2,446.2		$	3,480.4		$	1,824.3		$	711.0		$	1,251.9		$	886.7		$	10,600.5
Excess funds provided (used)	82.4			1,717.5			280.7			501.9			(1,327.0		)	(1,255.5		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At June 30, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	3.0		$	7.0		$	2.2		$	0.2		$	—		$	1,973.6		$	1,986.0
Loans, net of deferred loan fees and costs	2,131.0			1,682.6			1,515.3			179.5			1,951.5			84.6			7,544.5
Less: allowance for credit losses	(29.9		)	(23.6		)	(18.7		)	(5.1		)	(27.4		)	(1.2		)	(105.9		)
Total loans	2,101.1			1,659.0			1,496.6			174.4			1,924.1			83.4			7,438.6
Other assets acquired through foreclosure, net	13.1			24.1			—			—			—			22.1			59.3
Goodwill and other intangible assets, net	—			26.5			—			—			—			—			26.5
Other assets	42.2			62.7			10.8			15.4			21.1			361.0			513.2
Total assets	$	2,159.4		$	1,779.3		$	1,509.6		$	190.0		$	1,945.2		$	2,440.1		$	10,023.6
Liabilities:
Deposits	$	2,115.4		$	3,187.8		$	1,666.2		$	394.9		$	886.3		$	218.9		$	8,469.5
Other borrowings	—			—			—			—			—			337.5			337.5
Other liabilities	20.9			46.8			4.7			0.1			24.7			161.7			258.9
Total liabilities	2,136.3			3,234.6			1,670.9			395.0			911.0			718.1			9,065.9
Allocated equity:	233.7			212.5			83.1			105.6			152.3			170.5			957.7
Total liabilities and stockholders' equity	$	2,370.0		$	3,447.1		$	1,754.0		$	500.6		$	1,063.3		$	888.6		$	10,023.6
Excess funds provided (used)	210.6			1,667.8			244.4			310.6			(881.9		)	(1,551.5		)	—

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	Arizona			Nevada			Southern California			Northern California (2)			Central Business Lines (2)			Corporate & Other (2)			Consolidated Company
Three Months Ended June 30, 2015:	(in thousands)
Net interest income (expense)	$	32,091		$	29,946		$	24,070		$	5,216		$	24,432		$	(7,037	)	$	108,718
Provision for (recovery of) credit losses	826			(3,148		)	634			513			1,251			(76		)	—
Net interest income (expense) after provision for credit losses	31,265			33,094			23,436			4,703			23,181			(6,961		)	108,718
Non-interest income	1,008			2,370			850			271			321			(7,011		)	(2,191		)
Non-interest expense	(14,507		)	(14,918		)	(11,777		)	(2,142		)	(9,548		)	(8,317		)	(61,209		)
Income (loss) from continuing operations before income taxes	17,766			20,546			12,509			2,832			13,954			(22,289		)	45,318
Income tax expense (benefit)	6,970			7,191			5,261			1,191			5,233			(15,247		)	10,599
Net income	$	10,796		$	13,355		$	7,248		$	1,641		$	8,721		$	(7,042	)	$	34,719

(2)    Excludes legacy Bridge operations; Northern California includes two legacy TPB branches.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Three Months Ended June 30, 2014:	(in thousands)
Net interest income (expense)	$	29,211		$	29,359		$	22,502		$	2,200		$	16,226		$	(5,600	)	$	93,898
Provision for credit losses	3			(2,011		)	(1,672		)	—			3,467			720			507
Net interest income (expense) after provision for credit losses	29,208			31,370			24,174			2,200			12,759			(6,320		)	93,391
Non-interest income	934			2,248			865			34			643			875			5,599
Non-interest expense	(12,793		)	(15,922		)	(12,410		)	(861		)	(6,640		)	(3,616		)	(52,242		)
Income (loss) from continuing operations before income taxes	17,349			17,696			12,629			1,373			6,762			(9,061		)	46,748
Income tax expense (benefit)	6,805			6,194			5,310			577			2,536			(10,716		)	10,706
Income from continuing operations	10,544			11,502			7,319			796			4,226			1,655			36,042
Loss from discontinued operations, net	—			—			—			—			—			(504		)	(504		)
Net income	$	10,544		$	11,502		$	7,319		$	796		$	4,226		$	1,151		$	35,538

	Arizona			Nevada			Southern California			Northern California (2)			Central Business Lines (2)			Corporate & Other (2)			Consolidated Company
Six Months Ended June 30, 2015:	(in thousands)
Net interest income (expense)	$	61,076		$	59,155		$	46,560		$	9,669		$	47,742		$	(12,376	)	$	211,826
Provision for (recovery of) credit losses	158			(2,799		)	266			486			2,660			(71		)	700
Net interest income (expense) after provision for credit losses	60,918			61,954			46,294			9,183			45,082			(12,305		)	211,126
Non-interest income	1,947			4,653			1,515			322			1,037			(5,732		)	3,742
Non-interest expense	(29,268		)	(29,392		)	(23,398		)	(4,159		)	(18,826		)	(10,199		)	(115,242		)
Income (loss) from continuing operations before income taxes	33,597			37,215			24,411			5,346			27,293			(28,236		)	99,626
Income tax expense (benefit)	13,180			13,025			10,265			2,248			10,235			(24,236		)	24,717
Net income	$	20,417		$	24,190		$	14,146		$	3,098		$	17,058		$	(4,000	)	$	74,909

(2)    Excludes legacy Bridge operations; Northern California includes two legacy TPB branches.

63

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other (1)			Consolidated Company
Six Months Ended June 30, 2014:	(in thousands)
Net interest income (expense)	$	55,819		$	57,954		$	43,181		$	4,313		$	30,190		$	(6,782	)	$	184,675
Provision for credit losses	1,561			(2,895		)	(1,017		)	—			5,637			721			4,007
Net interest income (expense) after provision for credit losses	54,258			60,849			44,198			4,313			24,553			(7,503		)	180,668
Non-interest income	1,710			4,384			2,015			65			725			1,255			10,154
Non-interest expense	(26,053		)	(31,005		)	(24,358		)	(1,887		)	(13,148		)	(5,260		)	(101,711		)
Income (loss) from continuing operations before income taxes	29,915			34,228			21,855			2,491			12,130			(11,508		)	89,111
Income tax expense (benefit)	11,734			11,981			9,190			1,047			4,549			(17,171		)	21,330
Income from continuing operations	18,181			22,247			12,665			1,444			7,581			5,663			67,781
Loss from discontinued operations, net	—			—			—			—			—			(1,158		)	(1,158		)
Net income	$	18,181		$	22,247		$	12,665		$	1,444		$	7,581		$	4,505		$	66,623

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Item 2. Management's Discussions and Analysis of Financial Condition and Results of Operations.

This discussion is designed to provide insight into management's assessment of significant trends related to the Company's consolidated financial condition, results of operations, liquidity, capital resources, and interest rate sensitivity. This Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2014 and the interim Unaudited Consolidated Financial Statements and Notes to Unaudited Consolidated Financial Statements hereto and financial information appearing elsewhere in this report. Unless the context requires otherwise, the terms "Company," "we," and "our" refer to Western Alliance Bancorporation and its wholly-owned subsidiaries on a consolidated basis.

Forward-Looking Information

Certain statements contained in this Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 are “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act. The Company intends such forward-looking statements to be covered by the safe harbor provisions for forward-looking statements. All statements other than statements of historical fact are “forward-looking statements” for purposes of federal and state securities laws, including statements that are related to or are dependent on estimates or assumptions relating to expectations, beliefs, projections, future plans and strategies, anticipated events or trends, and similar expressions concerning matters that are not historical facts.

The forward-looking statements contained in this Form 10-Q reflect our current views about future events and financial performance and involve certain risks, uncertainties, assumptions, and changes in circumstances that may cause our actual results to differ significantly from historical results and those expressed in any forward-looking statement, including those risks discussed under the heading “Risk Factors” in this Form 10-Q. Risks and uncertainties include those set forth in our filings with the SEC and the following factors that could cause actual results to differ materially from those presented: 1) financial market and economic conditions adversely effecting financial performance; 2) dependency on real estate and events that negatively impact real estate; 3) high concentration of commercial real estate, construction and land development, and commercial and industrial loans; 4) actual credit losses may exceed expected losses in the loan portfolio; 5) the geographic concentrations of our assets increase the risks related to local economic conditions; 6) sovereign credit rating downgrades; 7) exposure of financial instruments to certain market risks may cause volatility in earnings; 8) dependence on low-cost deposits; 9) ability to borrow from the FHLB or the FRB; 10) perpetration of internet fraud; 11) information security breaches; 12) reliance on other companies' infrastructure; 13) a change in our creditworthiness; 14) expansion strategies may not be successful; 15) our ability to compete in a highly competitive market; 16) our ability to recruit and retain qualified employees, especially seasoned relationship bankers and senior management; 17) the effects of terrorist attacks or threats of war; 18) ineffective risk management policies and procedures; 19) risks associated with new lines of businesses; 20) risk of operating in a highly regulated industry and our ability to remain in compliance; 21) failure to comply with state and federal banking agency laws and regulations; 22) changes in interest rates and increased rate competition; 23) exposure to environmental liabilities related to the properties to which we acquire title; and 24) risks related to ownership and price of our common stock.

For more information regarding risks that may cause our actual results to differ materially from any forward-looking statements, see “Risk Factors” in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2014.

Financial Overview and Highlights

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the previously existing WAB Northern California offices are operating as a combined division under the Bridge trade name.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equipment Finance, Public Finance, Resort Finance, Technology Finance, Energy Infrastructure Group, and Mortgage Warehouse Lending. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

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Financial Result Highlights for the Second Quarter of 2015

• Net income available to common stockholders of $34.5 million and earnings per share of $0.39

• Operating net income of $43.5 million and earnings per share of $0.49, excluding merger charges, debt valuation adjustments, gains on other real estate¹, and operating performance of Bridge

• Bridge merger, completed on June 30, 2015, increased total assets, gross loans, and deposits by $2.23 billion, $1.45 billion, and $1.74 billion, respectively

• Pre-tax, pre-provision operating earnings of $59.9 million, up from $47.4 million for the second quarter 2014¹

• Net operating revenue of $114.4 million, constituting year-over-year growth of 15.1%, or $15.0 million, compared to an increase in operating expenses of 4.9%, or $2.6 million¹

• Net interest margin of 4.41%, compared to 4.35% in the first quarter 2015, and 4.39% in the second quarter 2014

• Efficiency ratio of 44.6%, compared to 46.7% in the first quarter 2015, and 49.3% in the second quarter 2014¹ 

• Total loans of $10.36 billion, including $1.45 billion acquired from Bridge and loans held for sale of $39.4 million, with organic loan growth for the quarter of $95.0 million and $515.3 million for the first six months of 2015

• Total deposits of $11.41 billion, including $1.74 billion acquired from Bridge, and organic deposit growth flat during the second quarter and $733.7 million for the first six months of 2015

• Nonperforming assets (nonaccrual loans and repossessed assets) decreased to 0.88% of total assets, from 1.11% at March 31, 2015, and from 1.23% at June 30, 2014

• Net loan recoveries (annualized) to average loans outstanding of 0.13%, compared to 0.06% in the first quarter 2015, and 0.09% in the second quarter 2014

• Qualifying debt of $208.4 million, an increase of $168.0 million from March 31, 2015 due to the issuance of $150.0 million in subordinated debt and $11.3 million in junior subordinated debt assumed in the Bridge merger

• Common Equity Tier 1 ratio of 9.1% and Total Capital ratio of 12.2%, compared to 9.0% and 11.3%, respectively, at March 31, 2015 under Basel III federal regulatory standards, which became effective on January 1, 2015

• Stockholders' equity of $1.51 billion, an increase of $463.4 million from March 31, 2015, including $431.0 million related to the Bridge acquisition, and an increase of $557.0 million from June 30, 2014

• Tangible book value per share, net of tax, of $11.25, an increase of 4.9% from $10.72 at March 31, 2015, and an increase of 24.7% from $9.02 at June 30, 2014

The impact to the Company from these items, and others of both a positive and negative nature, are discussed in more detail below as they pertain to the Company’s overall comparative performance for the three and six months ended June 30, 2015. As a bank holding company, management focuses on key ratios in evaluating the Company's financial condition and results of operations.

¹ See Non-GAAP Financial Measures section beginning on page 70.

66

Acquisition of Bridge Capital Holdings

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank, headquartered in San Jose, California. Under the terms of the acquisition, each outstanding share of Bridge common stock was exchanged for 0.8145 shares of the Company's common stock plus $2.39 in cash. The Company paid $36.5 million in cash and issued 12.5 million common shares for all equity interests in Bridge. The merger was undertaken, in part, because Bridge strengthens the Company's Northern California presence and provides new avenues for growth in technology and international services.

Bridge’s results of operations will be included in the Company’s results beginning July 1, 2015. Acquisition / restructure expenses related to the Bridge acquisition of $7.8 million and $8.0 million for three and six months ended June 30, 2015, respectively, have been included in non-interest expense, of which, approximately $0.6 million are acquisition related costs as defined by ASC 805. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805. Assets purchased and liabilities assumed were recorded at their respective acquisition date fair values. The fair values of assets acquired and liabilities assumed are subject to adjustment during the first twelve months after the acquisition date if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability. As the acquisition was completed at quarter end, the fair values of substantially all of the net assets are considered preliminary.

The Company merged Bridge Bank into WAB effective June 30, 2015, creating combined assets for the resulting bank of $13.47 billion and deposits of $11.41 billion. The recognized amounts of identifiable assets acquired and liabilities assumed are as follows:

	June 30, 2015
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,349
Investments in restricted stock	7,015
Loans	1,447,135
Premises and equipment	1,931
Other assets acquired through foreclosure	1,550
Bank owned life insurance	17,385
Investment in LIHTC	5,648
Intangible assets	14,997
Deferred tax assets, net	14,261
Other assets	19,656
Total assets	$	1,969,893
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	8,633
Total liabilities	1,761,951
Net assets acquired	$	207,942
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	259,627

(1) Cash and cash equivalents is net of a $6.2 million payment made by Bridge related to the cash out of vested, unexercised stock options at the date of closing. Cash acquired, less cash consideration paid of $36.5 million, resulted in net cash and cash equivalents increasing by $342.4 million following the acquisition.

67

Loans acquired in the Bridge acquisition consist of loans that are not considered impaired (non-PCI loans) and loans that have shown evidence of credit deterioration since origination (PCI loans) as of the acquisition date. All loans were recorded net of fair value adjustments (interest rate and credit marks), which were determined using discounted contractual cash flow models. The fair value of non-PCI loans acquired totals $1.43 billion, which is net of interest and credit marks of $23.0 million. The fair value of PCI loans totals $12.2 million, which is net of interest and credit marks of $2.1 million. See "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements for additional detail of the acquired loans.

In connection with the Bridge acquisition, the Company acquired intangible assets of $15.0 million, consisting primarily of core deposit intangibles. The core deposit intangible asset balance has been allocated to the Northern California and CBL segments based on their respective core deposit balances at June 30, 2015, and is subject to amortization over its estimated useful life of 10 years.

Goodwill in the amount of $259.6 million was recognized as a result of the acquisition. Goodwill has been allocated to the newly formed Northern California and CBL segments based on their proportionate loan and deposit balances as of June 30, 2015.

Qualifying debt assumed from Bridge is comprised of junior subordinated debt with a contractual balance of $17.5 million and is recorded net of a $6.2 million fair value mark that will be amortized over the remaining life of the trusts. See "Note 7. Qualifying Debt" of these Notes to Unaudited Consolidated Financial Statements for further detail and discussion of the debt.

In connection with the acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge executives based on years of service and final average salary. Pursuant to the terms of the SERP agreements, if the executive officer's service is terminated by Bridge or by the executive officer for "good reason" (as defined in the SERP agreements) within 24 months following a change in control, such as the Bridge acquisition, the executive officer is entitled to full vesting of the normal benefit under the SERP agreement, and such SERP benefits will be made in installment payments commencing on the first business day of January of the year following the executive officer's attainment of age 55 or, if the executive officer is already age 55 as of such termination of employment, on the first business day of January of the year following the executive officer's termination of employment. As of June 30, 2015, a $7.1 million liability included in other liabilities was recorded in the Company's Consolidated Balance Sheet related to the SERP. A discount rate of 5.75% and a 4.00% employee compensation rate increase were used in determining the SERP liability as of June 30, 2015.

Results of Operations and Financial Condition

A summary of our results of operations, financial condition, and select metrics are included in the following tables: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands, except per share amounts)
Net income available to common stockholders	$	34,472		$	35,186		$	74,486		$	65,918
Earnings per share applicable to common stockholders - basic	0.39			0.41			0.85			0.76
Earnings per share applicable to common stockholders - diluted	0.39			0.40			0.84			0.76
Net interest margin	4.41		%	4.39		%	4.38		%	4.40		%
Return on average assets	1.24			1.46			1.37			1.39
Return on average tangible common equity	14.10			18.62			15.61			17.98

	June 30, 2015		December 31, 2014
	(in thousands)
Total assets	$	13,470,104	$	10,600,498
Loans, net of deferred loan fees and costs	10,360,622		8,398,265
Total deposits	11,406,728		8,931,043

68

Asset Quality

For all banks and bank holding companies, asset quality plays a significant role in the overall financial condition of the institution and results of operations. The Company measures asset quality in terms of non-accrual loans as a percentage of gross loans and net charge-offs as a percentage of average loans. Net charge-offs are calculated as the difference between charged-off loans and recovery payments received on previously charged-off loans. The following table summarizes asset quality metrics: 

	June 30, 2015			December 31, 2014
	(in thousands)
Non-accrual loans	$	59,425		$	67,659
Non-performing assets	207,236			214,661
Non-accrual loans to gross loans	0.58		%	0.81		%
Net recoveries to average loans (1)	(0.13		)	(0.07		)

(1) Annualized for the three months ended June 30, 2015. Actual year-to-date for the year ended December 31, 2014.

Asset and Deposit Growth

The Company’s assets and liabilities are comprised primarily of loans and deposits; therefore, the ability to originate new loans and attract new deposits is fundamental to the Company’s growth. Total assets increased to $13.47 billion at June 30, 2015 from $10.60 billion at December 31, 2014. Total loans, including HFS loans, increased by $1.96 billion, or 23.4%, to $10.36 billion as of June 30, 2015, compared to $8.40 billion as of December 31, 2014. This loan growth primarily relates to the $1.45 billion of loans acquired from Bridge. Total deposits increased $2.48 billion, or 27.7%, to $11.41 billion as of June 30, 2015 from $8.93 billion as of December 31, 2014. The deposit growth primarily relates to the $1.74 billion of deposits acquired from Bridge.

RESULTS OF OPERATIONS

The following table sets forth a summary financial overview for the comparable periods:  

	Three Months Ended June 30,						Increase			Six Months Ended June 30,					Increase
	2015			2014			(Decrease)			2015		2014			(Decrease)
	(in thousands, except per share amounts)
Consolidated Income Statement Data:
Interest income	$	116,618		$	101,973		$	14,645		$	227,580	$	200,674		$	26,906
Interest expense	7,900			8,075			(175		)	15,754		15,999			(245		)
Net interest income	108,718			93,898			14,820			211,826		184,675			27,151
Provision for credit losses	—			507			(507		)	700		4,007			(3,307		)
Net interest income after provision for credit losses	108,718			93,391			15,327			211,126		180,668			30,458
Non-interest income	(2,191		)	5,599			(7,790		)	3,742		10,154			(6,412		)
Non-interest expense	61,209			52,242			8,967			115,242		101,711			13,531
Income from continuing operations before income taxes	45,318			46,748			(1,430		)	99,626		89,111			10,515
Income tax expense	10,599			10,706			(107		)	24,717		21,330			3,387
Income from continuing operations	34,719			36,042			(1,323		)	74,909		67,781			7,128
Loss from discontinued operations, net of tax	—			(504		)	(504		)	—		(1,158		)	(1,158		)
Net income	$	34,719		$	35,538		$	(819	)	$	74,909	$	66,623		$	8,286
Net income available to common stockholders	$	34,472		$	35,186		$	(714	)	$	74,486	$	65,918		$	8,568
Earnings per share applicable to common stockholders - basic	$	0.39		$	0.41		$	(0.02	)	$	0.85	$	0.76		$	0.09
Earnings per share applicable to common stockholders - diluted	$	0.39		$	0.40		$	(0.01	)	$	0.84	$	0.76		$	0.08

69

Non-GAAP Financial Measures

The following discussion and analysis contains financial information determined by methods other than those prescribed by GAAP. The Company's management uses these non-GAAP financial measures in their analysis of the Company's performance. These measurements typically adjust GAAP performance measures to exclude the effects of unrealized gains or losses on assets and liabilities measured at fair value as well as other items to adjust income available to common stockholders for certain significant activities or transactions that, in management's opinion, do not reflect recurring period-to-period comparisons of the Company's performance. Management believes presentation of these non-GAAP financial measures provides useful supplemental information that is essential to a complete understanding of the operating results of the Company's core businesses. Since the presentation of these non-GAAP performance measures and their impact differ between companies, these non-GAAP disclosures should not be viewed as a substitute for operating results determined in accordance with GAAP, nor are they necessarily comparable to non-GAAP performance measures that may be presented by other companies.

Pre-Tax, Pre-Provision Operating Earnings

Pre-tax, pre-provision operating earnings adjusts the level of earnings to exclude the impact of income taxes, provision for credit losses, and non-recurring or other items not considered part of the Company's core operations. Management believes that eliminating the effects of these items makes it easier to analyze underlying performance trends and enables investors to assess the Company's earnings power and ability to generate capital to cover credit losses.

The following table shows the components of pre-tax, pre-provision operating earnings for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Total non-interest (loss) income	$	(2,191	)	$	5,599		$	3,742		$	10,154
Less:
Gain (loss) on sales of investment securities, net	55			(163		)	644			203
Unrealized (losses) gains on assets and liabilities measured at fair value, net	(7,885		)	235			(8,194		)	(1,041		)
Loss on extinguishment of debt	(81		)	—			(81		)	—
Total operating non-interest income	5,720			5,527			11,373			10,992
Plus: net interest income	108,718			93,898			211,826			184,675
Net operating revenue	$	114,438		$	99,425		$	223,199		$	195,667
Total non-interest expense	$	61,209		$	52,242		$	115,242		$	101,711
Less:
Net (gain) loss on sales / valuations of repossessed and other assets	(1,218		)	184			(1,569		)	(2,377		)
Acquisition / restructure expense	7,842			26			8,001			183
Total operating non-interest expense	$	54,585		$	52,032		$	108,810		$	103,905
Pre-tax, pre-provision operating earnings	$	59,853		$	47,393		$	114,389		$	91,762

70

Tangible Common Equity

The following table presents financial measures related to tangible common equity. Tangible common equity represents total stockholders' equity less identifiable intangible assets, goodwill, and preferred stock. Management believes that tangible common equity financial measures are useful in evaluating the Company's capital strength, financial condition, and ability to manage potential losses. In addition, management believes that these measures improve comparability to other institutions that have not engaged in acquisitions that resulted in recorded goodwill and other intangible assets.

	June 30, 2015			December 31, 2014
	(dollars and shares in thousands)
Total stockholders' equity	$	1,514,744		$	1,000,928
Less: goodwill and intangible assets	299,975			25,913
Total tangible stockholders' equity	1,214,769			975,015
Less: preferred stock	70,500			70,500
Total tangible common equity	1,144,269			904,515
Plus: deferred tax - attributed to intangible assets	6,515			903
Total tangible common equity, net of tax	$	1,150,784		$	905,418
Total assets	$	13,470,104		$	10,600,498
Less: goodwill and intangible assets, net	299,975			25,913
Tangible assets	13,170,129			10,574,585
Plus: deferred tax - attributed to intangible assets	6,515			903
Total tangible assets, net of tax	$	13,176,644		$	10,575,488
Tangible equity ratio	9.2		%	9.2		%
Tangible common equity ratio	8.7			8.6
Common shares outstanding	102,291			88,691
Tangible book value per share, net of tax	$	11.25		$	10.21

Efficiency Ratio

The following table shows the components used in the calculation of the efficiency ratio, which management uses as a metric for assessing cost efficiency:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(dollars in thousands)
Total operating non-interest expense	$	54,585		$	52,032		$	108,810		$	103,905
Divided by:
Total net interest income	$	108,718		$	93,898		$	211,826		$	184,675
Plus:
Tax equivalent interest adjustment	7,878			6,029			15,267			11,734
Operating non-interest income	5,720			5,527			11,373			10,992
Net operating revenue - TEB	122,316			105,454			238,466			207,401
Efficiency ratio - TEB	44.6		%	49.3		%	45.6		%	50.1		%

71

Adjusted Allowance for Credit Losses

The adjusted allowance for credit losses to gross loans ratio includes an adjustment for the remaining credit marks on acquired performing and purchased credit impaired loans. Under GAAP, the allowance for credit losses on acquired loans is not carried over in an acquisition as acquired loans are recorded at fair value, net of related interest rate and credit marks, which discounts the loans based on expected future cash flows. The credit marks on acquired loans represent the allowance for credit losses carried over to the Company. Therefore, by adding back the remaining credit marks on acquired loans, management believes this is more indicative of the allowance available for inherent losses in the loan portfolio.

	June 30, 2015			December 31, 2014
	(in thousands)
Allowance for credit losses	$	115,056		$	110,216
Plus: remaining credit marks
Acquired performing loans	16,405			2,335
Purchased credit impaired loans	8,643			9,279
Adjusted allowance for credit losses	$	140,104		$	121,830
Gross loans held for investment and deferred fees, net	$	10,321,221		$	8,398,265
Plus: remaining credit marks
Acquired performing loans	16,405			2,335
Purchased credit impaired loans	8,643			9,279
Adjusted loans, net of deferred fees and costs	$	10,346,269		$	8,409,879
Allowance for credit losses to gross loans	1.11		%	1.31		%
Allowance for credit losses to gross loans, adjusted for acquisition accounting	1.35			1.45

72

Regulatory Capital

The following table presents certain financial measures related to regulatory capital under Basel III, which includes common equity Tier 1 and total capital. The FRB and other banking regulators use common equity Tier 1 and total capital as a basis for assessing a bank's capital adequacy; therefore, management believes it is useful to assess financial condition and capital adequacy using this same basis. Specifically, the total capital ratio takes into consideration the risk levels of assets and off-balance sheet financial instruments. In addition, management believes that the classified assets to common equity Tier 1 plus allowance measure is an important regulatory metric for assessing asset quality.

	Basel III
	June 30, 2015
	(dollars in thousands)
Common Equity Tier 1:
Common Equity	$	1,444,244
Less:
Accumulated other comprehensive income	15,348
Non-qualifying goodwill and intangibles	289,217
Disallowed deferred tax asset	3,093
Unrealized gain on trust preferred securities	5,965
Common equity Tier 1 (regulatory)	1,130,621
Plus:
Trust preferred securities	81,500
Preferred stock	70,500
Less:
Disallowed deferred tax asset	4,640
Unrealized gain on trust preferred securities	8,948
Tier 1 capital	$	1,269,033
Divided by:
Risk-weighted assets (regulatory)	$	12,435,603
Common equity Tier 1 ratio	9.1		%
Total Capital:
Tier 1 capital (regulatory)	$	1,269,033
Plus:
Subordinated debt	136,778
Qualifying allowance for credit losses	115,056
Other	2,124
Less: Tier 2 qualifying capital deductions	—
Tier 2 capital	253,958
Total capital	$	1,522,991
Total capital ratio	12.2		%
Classified assets to common equity Tier 1 plus allowance for credit losses:
Classified assets	$	230,959
Divided by:
Common equity Tier 1 (regulatory)	1,130,621
Plus: Allowance for credit losses	115,056
Total common equity Tier 1 plus allowance for credit losses	$	1,245,677
Classified assets to common equity Tier 1 plus allowance	19		%

73

Net Interest Margin

The net interest margin is reported on a TEB. A tax equivalent adjustment is added to reflect interest earned on certain municipal securities and loans that are exempt from federal income tax. The following tables set forth the average balances and interest income on a fully TEB and interest expense for the periods indicated:

	Three Months Ended June 30,
	2015							2014
	Average Balance			Interest		Average Yield / Cost		Average Balance			Interest		Average Yield / Cost
	(dollars in thousands)
Interest earning assets
Loans (1), (2), (3)	$	8,837,746		$	105,468	5.06	%	$	7,178,255		$	90,583	5.29	%
Securities - taxable (1)	1,043,257			5,793		2.22		1,198,620			7,025		2.34
Securities - tax-exempt	380,303			3,483		5.36		431,330			3,869		7.66
Total Securities	1,423,560			9,276		3.06		1,629,950			10,894		3.08
Other	309,437			1,874		2.42		292,386			496		0.68
Total interest earnings assets	10,570,743			116,618		4.71		9,100,591			101,973		4.75
Non-interest earning assets
Cash and due from banks	118,581							138,660
Allowance for credit losses	(114,892		)					(105,024		)
Bank owned life insurance	143,214							141,844
Other assets	459,075							462,051
Total assets	$	11,176,721						$	9,738,122
Interest-bearing liabilities
Interest-bearing deposits:
Interest bearing transaction accounts	$	971,609		$	414	0.17	%	$	791,501		$	385	0.19	%
Savings and money market	4,213,013			2,975		0.28		3,583,500			2,691		0.30
Time certificates of deposits	1,834,352			1,973		0.43		1,700,412			1,854		0.44
Total interest-bearing deposits	7,018,974			5,362		0.31		6,075,413			4,930		0.32
Short-term borrowings	177,799			1,774		3.99		236,197			216		0.37
Long-term debt	110,957			313		1.13		280,356			2,486		3.55
Junior subordinated debt	40,831			451		4.42		42,834			443		4.14
Total interest-bearing liabilities	7,348,561			7,900		0.43		6,634,800			8,075		0.49
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	2,593,543							2,045,534
Other liabilities	148,371							126,732
Stockholders’ equity	1,086,246							931,056
Total liabilities and stockholders' equity	$	11,176,721						$	9,738,122
Net interest income and margin (4)				$	108,718	4.41	%				$	93,898	4.39	%
Net interest spread (5)						4.28	%						4.26	%

(1) Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $7.9 million and $6.0 million for the three months ended June 30, 2015 and 2014, respectively.

(2) Net loan fees of $6.1 million and $4.8 million are included in the yield computation for the three months ended June 30, 2015 and 2014, respectively.

(3) Includes non-accrual loans.

(4) Net interest margin is computed by dividing net interest income by total average earning assets.

(5) Net interest spread represents average yield earned on interest-earning assets less the average rate paid on interest bearing liabilities.

74

	Six Months Ended June 30,
	2015							2014
	Average Balance			Interest		Average Yield / Cost		Average Balance			Interest		Average Yield / Cost
	(dollars in thousands)
Interest earning assets
Loans (1), (2), (3)	$	8,693,105		$	205,859	5.01	%	$	7,036,539		$	205,859	5.28	%
Securities - taxable (1)	1,069,238			12,085		2.87		1,194,498			14,162		2.93
Securities - tax-exempt	382,074			6,979		5.35		446,252			8,057		5.10
Total Securities	1,451,312			19,064		3.07		1,640,750			22,219		3.11
Other	223,283			2,657		2.38		251,551			2,657		0.85
Total interest earnings assets	10,367,700			227,580		4.68		8,928,840			200,674		4.76
Non-interest earning assets
Cash and due from banks	118,337							138,091
Allowance for credit losses	(112,955		)					(103,099		)
Bank owned life insurance	142,792							141,372
Other assets	454,616							447,654
Total assets	$	10,970,490						$	9,552,858
Interest-bearing liabilities
Interest-bearing deposits:
Interest bearing transaction accounts	$	945,943		$	808	0.17	%	$	778,341		$	768	0.20	%
Savings and money market	4,062,052			5,751		0.28		3,518,279			5,254		0.30
Time certificates of deposits	1,884,643			3,949		0.42		1,660,212			3,573		0.43
Total interest-bearing deposits	6,892,638			10,508		0.30		5,956,832			9,595		0.32
Short-term borrowings	177,647			3,525		3.97		201,799			345		0.34
Long-term debt	156,222			829		1.06		291,031			5,195		3.57
Junior subordinated debt	40,637			892		4.39		42,355			864		4.08
Total interest-bearing liabilities	7,267,144			15,754		0.43		6,492,017			15,999		0.49
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	2,482,314							2,049,806
Other liabilities	162,658							102,251
Stockholders’ equity	1,058,374							908,784
Total liabilities and stockholders' equity	$	10,970,490						$	9,552,858
Net interest income and margin (4)				$	211,826	4.38	%				$	184,675	4.40	%
Net interest spread (5)						4.25	%						4.27	%

(1) Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $15.3 million and $11.7 million for the six months ended June 30, 2015 and 2014, respectively.

(2) Net loan fees of $11.2 million and $8.9 million are included in the yield computation for the six months ended June 30, 2015 and 2014, respectively.

(3) Includes non-accrual loans.

(4) Net interest margin is computed by dividing net interest income by total average earning assets.

(5) Net interest spread represents average yield earned on interest-earning assets less the average rate paid on interest bearing liabilities.

75

	Three Months Ended June 30,									Six Months Ended June 30,
	2015 versus 2014									2015 versus 2014
	Increase (Decrease) Due to Changes in (1)									Increase (Decrease) Due to Changes in (1)
	Volume			Rate			Total			Volume			Rate			Total
	(in thousands)
Interest income:
Loans	$	19,804		$	(4,919	)	$	14,885		$	39,229		$	(10,757	)	$	28,472
Interest on investment securities	(1,345		)	(273		)	(1,618		)	(2,488		)	(667		)	(3,155		)
Federal funds sold and other	103			1,275			1,378			(336		)	1,925			1,589
Total interest income	18,562			(3,917		)	14,645			36,405			(9,499		)	26,906
Interest expense:
Interest bearing transaction accounts	77			(48		)	29			143			(103		)	40
Savings and money market	445			(161		)	284			770			(273		)	497
Time deposits	144			(25		)	119			470			(94		)	376
Short-term borrowings	(583		)	2,141			1,558			(480		)	3,660			3,180
Long-term debt	(478		)	(1,695		)	(2,173		)	(715		)	(3,651		)	(4,366		)
Junior subordinated debt	(22		)	30			8			(38		)	66			28
Total interest expense	(417		)	242			(175		)	150			(395		)	(245		)
Net increase (decrease)	$	18,979		$	(4,159	)	$	14,820		$	36,255		$	(9,104	)	$	27,151

(1) Changes due to both volume and rate have been allocated to volume changes.

Comparison of interest income, interest expense and net interest margin

The Company’s primary source of revenue is interest income. Interest income for the three months ended June 30, 2015 was $116.6 million, an increase of 14.4%, compared to $102.0 million for the three months ended June 30, 2014. This increase was primarily the result of a $1.66 billion increase in the average loan balance which drove a $14.9 million increase in loan interest income for the three months ended June 30, 2015 compared to the three months ended June 30, 2014. Additionally, interest income for the three months ended June 30, 2015 includes $3.2 million of accretion income from PCI loans, compared to $4.9 million for the same period 2014. Interest income on investment securities decreased $1.6 million and other interest income increased by $1.4 million for the comparable period. Despite the increase in interest income, average yield on interest earning assets dropped 4 basis points for the three months ended June 30, 2015 compared to the same period in 2014, which was primarily the result of decreased yields on loans of 23 basis points.

For the six months ended June 30, 2015, interest income was $227.6 million, an increase of 13.4%, compared to $200.7 million for the six months ended June 30, 2014. This increase was primarily the result of a $1.66 billion increase in the average loan balance which drove a $28.5 million increase in loan interest income for the six months ended June 30, 2015. Additionally, interest income for the six months ended June 30, 2015 includes $5.2 million of accretion income from PCI loans, compared to $8.3 million for the same period 2014. Interest income on investment securities decreased $3.2 million and other interest income increased by $1.6 million for the comparable period. Despite the increase in interest income, average yield on interest earning assets dropped 8 basis points for the six months ended June 30, 2015 compared to the same period in 2014, which was primarily the result of decreased yields on loans of 27 basis points.

Interest expense for the three months ended June 30, 2015 was $7.9 million, compared to $8.1 million for the three months ended June 30, 2014. Interest expense on deposits increased $0.4 million for the same period as average interest bearing deposits for the quarter increased $943.6 million, offset by a 1 basis point decrease in average cost of interest bearing deposits. Interest expense on borrowings decreased by $0.6 million as a result of a $227.8 million decrease in average borrowings for the quarter.

For the six months ended June 30, 2015, interest expense was $15.8 million, compared to $16.0 million for the six months ended June 30, 2014. Interest expense on deposits increased $0.9 million for the same period as average interest bearing deposits increased $935.8 million, offset by a 2 basis point decrease in average cost of interest bearing deposits. Interest expense on borrowings decreased by $1.2 million as a result of a $159.0 million decrease in average borrowings for the year.

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Net interest income was $108.7 million for the three months ended June 30, 2015, compared to $93.9 million for the three months ended June 30, 2014, an increase of $14.8 million, or 15.8%. The increase in net interest income reflects a $1.47 billion increase in average interest earning assets, offset by a $713.8 million increase in average interest-bearing liabilities. The increase in net interest margin of 2 basis points was mostly due to a 6 basis point decrease in our average cost of interest-bearing liabilities during the three months ended June 30, 2015 compared to the same period in 2014.

For the six months ended June 30, 2015, net interest income was $211.8 million, compared to $184.7 million for the six months ended June 30, 2014. The increase in net interest income reflects a $1.44 billion increase in average interest earning assets, offset by a $775.1 million increase in average interest-bearing liabilities. The decrease in net interest margin of 2 basis points was mostly due to a 27 basis point decrease in our average loan yield during the six months ended June 30, 2015 compared to the same period in 2014.

Provision for Credit Losses

The provision for credit losses in each period is reflected as a reduction in earnings in that period. The provision is equal to the amount required to maintain the allowance for credit losses at a level that is adequate to absorb probable credit losses inherent in the loan portfolio. There was no provision for credit losses for the three months ended June 30, 2015, compared with $0.5 million for the three months ended June 30, 2014. For the six months ended June 30, 2015, the provision for credit losses was $0.7 million, compared to $4.0 million for the six months ended June 30, 2014. The provision decrease was primarily due to an improvement in underlying asset quality. The Company may establish an additional allowance for credit losses for PCI loans through provision for credit losses when impairment is determined as a result of lower than expected cash flows. As of June 30, 2015 and December 31, 2014, the allowance for credit losses on PCI loans was less than $0.1 million and $0.3 million, respectively.

Non-interest Income

The following table presents a summary of non-interest income for the periods presented: 

	Three Months Ended June 30,									Six Months Ended June 30,
	2015			2014			Increase (Decrease)			2015			2014			Increase (Decrease)
	(in thousands)
Service charges and fees	$	3,128		$	2,758		$	370		$	6,017		$	5,319		$	698
Income from bank owned life insurance	772			959			(187		)	1,749			1,908			(159		)
Card income	899			860			39			1,712			1,645			67
Gain (loss) on sales of investment securities, net	55			(163		)	218			644			203			441
Loss on extinguishment of debt	(81		)	—			(81		)	(81		)	—			(81		)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	(7,885		)	235			(8,120		)	(8,194		)	(1,041		)	(7,153		)
Other income	921			950			(29		)	1,895			2,120			(225		)
Total non-interest (loss) income	$	(2,191	)	$	5,599		$	(7,790	)	$	3,742		$	10,154		$	(6,412	)

Total non-interest income for the three months ended June 30, 2015 compared to the three months ended June 30, 2014decreased by $7.8 million. The decrease in non-interest income is largely attributable to the $8.1 million increase in net unrealized losses on assets and liabilities measured at fair value, which primarily relates to the fair value adjustment of junior subordinated debt due to updated valuation inputs as discussed in "Note 7. Qualifying Debt" to the Consolidated Financial Statements. The loss resulting from the fair value adjustment of junior subordinated debt was $7.7 million for the three months ended June 30, 2015, compared to a gain of $0.1 million for the three months ended June 30, 2014.

Total non-interest income for the six months ended June 30, 2015 compared to the six months ended June 30, 2014decreased by $6.4 million, or 63.1%. The decrease in non-interest income is largely attributable to the $7.2 million increase in net unrealized losses on assets and liabilities measured at fair value, which primarily relates to the fair value adjustment of junior subordinated debt. The loss resulting from the fair value adjustment of junior subordinated debt was $8.0 million for the six months ended June 30, 2015, compared to a loss of $0.9 million for the six months ended June 30, 2014. This decrease was slightly offset by the $0.7 million increase in service charges and fees.

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Non-interest Expense

The following table presents a summary of non-interest expense for the periods presented:

	Three Months Ended June 30,								Six Months Ended June 30,
	2015			2014		Increase (Decrease)			2015			2014			Increase (Decrease)
	(in thousands)
Salaries and employee benefits	$	32,406		$	31,751	$	655		$	64,947		$	61,306		$	3,641
Occupancy	4,949			4,293		656			9,762			8,979			783
Legal, professional, and directors' fees	4,611			4,192		419			8,606			7,831			775
Data processing	2,683			2,580		103			5,809			5,309			500
Insurance	2,274			2,087		187			4,364			4,480			(116		)
Loan and repossessed asset expenses	1,284			889		395			2,374			2,036			338
Card expense	613			530		83			1,087			1,130			(43		)
Marketing	463			506		(43		)	840			1,065			(225		)
Intangible amortization	281			302		(21		)	562			899			(337		)
Net (gain) loss on sales / valuations of repossessed and other assets	(1,218		)	184		1,402			(1,569		)	(2,377		)	(808		)
Acquisition / restructure expense	7,842			26		7,816			8,001			183			7,818
Other expense	5,021			4,902		119			10,459			10,870			(411		)
Total non-interest expense	$	61,209		$	52,242	$	8,967		$	115,242		$	101,711		$	13,531

Total non-interest expense for the three months ended June 30, 2015 compared to the three months ended June 30, 2014increased$9.0 million, or 17.2%. This increase primarily relates to an increase in acquisition / restructure expense, salaries and employee benefits, and occupancy, which was slightly offset by the increase in the net gain on sales / valuation of repossessed and other assets. The increase in the acquisition / restructure expense relates to the acquisition of Bridge. The increase in salaries and employee benefits is the result of growth in staffing to support continued asset growth. Further, the $1.4 million increase in the net gain on sales / valuations of repossessed and other assets for the same period is due to greater non-recurring gains from the performance of OREO and other assets owned by the Company period over period.

Total non-interest expense for the six months ended June 30, 2015 compared to the six months ended June 30, 2014increased$13.5 million, or 13.3%. This increase primarily relates to an increase in acquisition / restructure expense and salaries and employee benefits. The increase in the acquisition / restructure expense relates to our acquisition of Bridge. The increase in salaries and employee benefits is the result of growth in staffing to support continued asset growth as well as an increase in performance awards.

Income Taxes

The effective tax rate for the six months ended June 30, 2015 was 24.81%, compared to 23.94% for the six months ended June 30, 2014. The increase in the effective tax rate is primarily due to proportionately lower tax-exempt income, increased state taxes, and a decrease in the amount of valuation allowance that will be released during 2015.

Business Segment Results

The operating segments are as follows: Arizona, Nevada, Southern California, Northern California, CBL, and Corporate & Other.

Arizona reported a gross loan balance of $2.43 billion at June 30, 2015, compared to $2.34 billion at December 31, 2014, and $2.13 billion at June 30, 2014. In addition, total deposits at June 30, 2015 were $2.37 billion, compared to $2.18 billion at December 31, 2014, and $2.12 billion at June 30, 2014. Pre-tax income was $17.8 million and $17.3 million for the three months ended June 30, 2015 and 2014, respectively, and $33.6 million and $29.9 million for the six months ended June 30, 2015 and 2014, respectively.

Nevada reported a gross loan balance of $1.76 billion at June 30, 2015, compared to $1.67 billion at December 31, 2014 and $1.68 billion at June 30, 2014. In addition, total deposits at June 30, 2015 were $3.32 billion, compared to $3.23 billion at December 31, 2014, and $3.19 billion at June 30, 2014. Pre-tax income was $20.5 million and $17.7 million for the three months ended June 30, 2015 and 2014, respectively, and $37.2 million and $34.2 million for the six months ended June 30, 2015 and 2014, respectively.

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Southern California reported a gross loan balance of $1.66 billion at June 30, 2015, compared to $1.55 billion at December 31, 2014, and $1.52 billion at June 30, 2014. In addition, total deposits at June 30, 2015 were $1.95 billion, compared to $1.74 billion at December 31, 2014, and $1.67 billion at June 30, 2014. Pre-tax income was $12.5 million and $12.6 million for the three months ended June 30, 2015 and 2014, respectively, and $24.4 million and $21.9 million for the six months ended June 30, 2015 and 2014, respectively.

Northern California reported a gross loan balance of $1.08 billion at June 30, 2015, compared to $198.6 million at December 31, 2014, and $179.5 million at June 30, 2014. Total deposits at June 30, 2015 were $1.55 billion, compared to $584.0 million at December 31, 2014, and $394.9 million at June 30, 2014. Pre-tax income was $2.8 million and $1.4 million for the three months ended June 30, 2015 and 2014, respectively, and $5.3 million and $2.5 million for the six months ended June 30, 2015 and 2014, respectively.

CBL reported a gross loan balance of $3.39 billion at June 30, 2015, compared to $2.59 billion at December 31, 2014, and $1.95 billion at June 30, 2014. In addition, total deposits at June 30, 2015 were $1.95 billion, compared to $946.6 million at December 31, 2014, and $886.3 million at June 30, 2014. Pre-tax income was $14.0 million and $6.8 million for the three months ended June 30, 2015 and 2014, respectively, and $27.3 million and $12.1 million for the six months ended June 30, 2015 and 2014, respectively.

BALANCE SHEET ANALYSIS

Total assets increased$2.87 billion, or 27.1%, to $13.47 billion at June 30, 2015, compared to $10.60 billion at December 31, 2014. The increase in assets primarily relates to the assets acquired from Bridge. Loans increased $1.96 billion, or 23.4%, to $10.36 billion at June 30, 2015, including $1.45 billion acquired from Bridge, and $515 million organic growth.

Total liabilities increased$2.36 billion, or 24.5%, to $11.96 billion at June 30, 2015, compared to $9.60 billion at December 31, 2014. The increase in liabilities is due to the increase in total deposits of $2.48 billion, or 27.7%, to $11.41 billion, including $1.74 billion acquired from Bridge, and $734 million of organic growth.

Total stockholders’ equity increased by $513.8 million, or 51.3%, to $1.51 billion at June 30, 2015, compared to $1.00 billion at December 31, 2014. The merger of Bridge increased stockholders equity by $431 million primarily due to the issuance of 12.5 million shares of the Company's stock.

Investment securities

Investment securities are classified at the time of acquisition as either HTM, AFS, or trading based upon various factors, including asset/liability management strategies, liquidity and profitability objectives, and regulatory requirements. HTM securities are carried at amortized cost, adjusted for amortization of premiums or accretion of discounts. AFS securities are securities that may be sold prior to maturity based upon asset/liability management decisions. Investment securities classified as AFS are carried at fair value. Unrealized gains or losses on AFS securities are recorded as part of AOCI in stockholders’ equity. Amortization of premiums or accretion of discounts on MBS is periodically adjusted for estimated prepayments. Investment securities measured at fair value are reported at fair value, with unrealized gains and losses included in current period earnings.

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The investment securities portfolio of the Company is utilized as collateral for borrowings, required collateral for public deposits, and customer repurchase agreements, and to manage liquidity, capital, and interest rate risk. The following table summarizes the carrying value of the investment securities portfolio for each of the periods below: 

	June 30, 2015		December 31, 2014
	(in thousands)
Collateralized debt obligations	$	10,804	$	11,445
Commercial MBS issued by GSEs	13,209		2,147
Corporate debt securities	13,665		52,489
CRA investments	32,537		24,332
Municipal obligations	292,413		299,037
Mutual funds	—		37,702
Preferred stock	83,051		82,612
Private label commercial MBS	4,979		5,149
Private label residential MBS	102,071		70,243
Residential MBS issued by GSEs	873,058		893,047
Trust preferred securities	25,648		25,546
U.S. government sponsored agency securities	24,609		18,346
U.S. treasury securities	3,891		—
Total investment securities	$	1,479,935	$	1,522,095

Gross unrealized losses at June 30, 2015 are primarily caused by interest rate fluctuations, credit spread widening, and reduced liquidity in applicable markets. The Company has reviewed securities on which there is an unrealized loss in accordance with its accounting policy for OTTI securities described in "Note 3. Investment Securities" to the Unaudited Consolidated Financial Statements contained herein. There were no impairment charges recorded during the three and six months ended June 30, 2015 and 2014.

The Company does not consider any securities to be other-than-temporarily impaired as of June 30, 2015 and December 31, 2014. However, the Company cannot guarantee that additional OTTI will not occur in future periods. At June 30, 2015, the Company had the intent and ability to retain its investments for a period of time sufficient to allow for any anticipated recovery in fair value.

Loans

The table below summarizes the distribution of the Company’s held for investment loan portfolio at the end of each of the periods indicated: 

	June 30, 2015			December 31, 2014
	(in thousands)
Loans, held for investment
Commercial and industrial	$	4,576,303		$	3,326,708
Commercial real estate - non-owner occupied	2,195,018			2,052,566
Commercial real estate - owner occupied	2,019,280			1,732,888
Construction and land development	1,002,698			748,053
Residential real estate	320,591			299,402
Commercial leases	183,378			205,639
Consumer	23,953			33,009
Loans, net of deferred loan fees and costs	10,321,221			8,398,265
Allowance for credit losses	(115,056		)	(110,216		)
Total loans HFI	$	10,206,165		$	8,288,049

Net deferred loan fees and costs as of June 30, 2015 and December 31, 2014 total $14.0 million and $12.5 million, respectively. Net unamortized discounts on loans total $8.1 million and $7.5 million as of June 30, 2015 and December 31, 2014, respectively.

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As of June 30, 2015, the Company also has $39.4 million of HFS loans.

Concentrations of Lending Activities

The Company monitors concentrations within five broad categories: geography, industry, product, call report classifications, and collateral. The Company’s loan portfolio includes significant credit exposure to the CRE market. At June 30, 2015 and December 31, 2014, CRE related loans accounted for approximately 51% and 54% of total loans, respectively. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 48% and 46% of these CRE loans, excluding construction and land loans, were owner-occupied at June 30, 2015 and December 31, 2014, respectively.

Impaired loans

A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis if full repayment of all principal and interest is expected and the loan is both well-secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310 based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are charged against the allowance for credit losses.

In addition to our own internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations, or loan impairment methodology.

Total non-performing loans decreased by $9.6 million, or 6.1%, at June 30, 2015 to $147.9 million from $157.5 million at December 31, 2014. 

	June 30, 2015			December 31, 2014
	(dollars in thousands)
Total non-accrual loans (1)	$	59,425		$	67,659
Loans past due 90 days or more on accrual status	8,284			5,132
Troubled debt restructured loans (2)	80,192			84,720
Total nonperforming loans	147,901			157,511
Other impaired loans	3,248			9,239
Total impaired loans	$	151,149		$	166,750
Other assets acquired through foreclosure, net	$	59,335		$	57,150
Non-accrual loans to gross loans held for investment	0.58		%	0.81		%
Loans past due 90 days or more on accrual status to total loans	0.08			0.06

(1) Includes non-accrual TDR loans of $42.6 million and $53.6 million as of June 30, 2015 and December 31, 2014, respectively.

(2) Includes accruing TDR loans only.

Interest income received on non-accrual loans was $0.5 million and $1.2 million for the three and six months ended June 30, 2015, respectively, compared to $0.6 million and $1.2 million for the three and six months ended June 30, 2014, respectively. The interest income that would have been recorded under the original terms of non-accrual loans was $0.7 million and $1.4 million for the three and six months ended June 30, 2015, respectively, compared to $0.8 million and $1.8 million for the three and six months ended June 30, 2014, respectively.

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The composition of non-accrual loans by loan type and by segment were as follows: 

	At June 30, 2015						December 31, 2014
	Non-accrual Balance		Percent		Percent of Total HFI Loans		Non-accrual Balance		Percent		Percent of Total HFI Loans
	(dollars in thousands)
Commercial and industrial	$	6,980	11.75	%	0.07	%	$	3,490	5.16	%	0.04	%
Commercial real estate	39,615		66.67		0.38		52,457		77.54		0.63
Construction and land development	2,516		4.23		0.03		5,326		7.87		0.06
Residential real estate	10,117		17.02		0.10		6,173		9.12		0.07
Consumer	197		0.33		—		213		0.31		0.01
Total non-accrual loans	$	59,425	100.00	%	0.58	%	$	67,659	100.00	%	0.81	%

	June 30, 2015			December 31, 2014
	Nonaccrual Loans	Percent of Segment's Total Loans		Nonaccrual Loans	Percent of Segment's Total Loans
Arizona	17,641	0.73	%	24,179	1.03	%
Nevada	15,354	0.87	%	26,678	1.60	%
Southern California	7,141	0.26	%	388	0.02	%
Northern California	—	—	%	—	—	%
Central Business Lines	3,797	0.11	%	188	0.01	%
Corporate & Other	15,492	38.22	%	16,225	35.30	%
Total non-accrual loans	59,425			67,658

Troubled Debt Restructured Loans

A TDR loan is a loan that is granted a concession, for reasons related to a borrower’s financial difficulties, that the lender would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in accrued interest, extensions, deferrals, renewals, and rewrites. A TDR loan is also considered impaired. Generally, a loan that is modified at an effective market rate of interest is no longer disclosed as a TDR in years subsequent to the restructuring if it is performing based on the terms specified by the restructuring agreement. However, such loans continue to be considered impaired.

As of June 30, 2015 and December 31, 2014, the aggregate amount of loans classified as impaired was $151.1 million and $166.8 million, respectively, a net decrease of 9.4%. The total specific allowance for credit losses related to these loans was $7.2 million and $10.8 million for June 30, 2015 and December 31, 2014, respectively. The Company had $80.2 million and $84.7 million in loans classified as accruing restructured loan for June 30, 2015 and December 31, 2014, respectively.

Impaired loans by segment at June 30, 2015 were as follows:

	June 30, 2015	December 31, 2014
Arizona	32,884	43,174
Nevada	66,671	78,072
Southern California	9,363	5,203
Northern California	—	—
Central Business Lines	3,797	188
Corporate & Other	38,434	40,113
Total impaired loans	151,149	166,750

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The following tables present a breakdown of total impaired loans and the related specific reserves for the periods indicated: 

	June 30, 2015
	Impaired Balance		Percent		Percent of Total HFI Loans		Reserve Balance		Percent		Percent of Total Allowance
	(dollars in thousands)
Commercial and industrial	$	15,736	10.41	%	0.15	%	$	1,686	23.56	%	1.47	%
Commercial real estate	93,361		61.77		0.90		3,334		46.58		2.90
Construction and land development	19,117		12.65		0.19		1,416		19.78		1.23
Residential real estate	22,611		14.96		0.22		717		10.02		0.62
Consumer	324		0.21		—		4		0.06		—
Total impaired loans	$	151,149	100.00	%	1.46	%	$	7,157	100.00	%	6.22	%

	December 31, 2014
	Impaired Balance		Percent		Percent of Total HFI Loans		Reserve Balance		Percent		Percent of Total Allowance
	(dollars in thousands)
Commercial and industrial	$	14,122	8.47	%	0.17	%	$	1,965	18.25	%	1.78	%
Commercial real estate	111,217		66.70		1.32		4,619		42.91		4.19
Construction and land development	21,748		13.04		0.26		3,112		28.91		2.82
Residential real estate	19,300		11.57		0.23		1,052		9.77		0.95
Consumer	363		0.22		—		17		0.16		0.02
Total impaired loans	$	166,750	100.00	%	1.98	%	$	10,765	100.00	%	9.76	%

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Allowance for Credit Losses

The following table summarizes the activity in our allowance for credit losses for the period indicated: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(dollars in thousands)
Allowance for credit losses:
Balance at beginning of period	$	112,098		$	103,899		$	110,216		$	100,050
Provision charged to operating expense:
Commercial and industrial	2,028			3,152			5,590			3,544
Commercial real estate	(903		)	(1,422		)	(1,958		)	978
Construction and land development	165			(247		)	(551		)	1,723
Residential real estate	(1,233		)	(861		)	(2,156		)	(1,351		)
Consumer	(57		)	(115		)	(225		)	(887		)
Total Provision	—			507			700			4,007
Recoveries of loans previously charged-off:
Commercial and industrial	681			1,254			1,597			2,176
Commercial real estate	1,738			1,248			2,121			1,808
Construction and land development	1,373			498			1,530			709
Residential real estate	1,184			314			1,717			867
Consumer	24			191			64			361
Total recoveries	5,000			3,505			7,029			5,921
Loans charged-off:
Commercial and industrial	(1,771		)	(1,038		)	(2,164		)	(2,516		)
Commercial real estate	—			(330		)	—			(501		)
Construction and land development	—			(78		)	—			(78		)
Residential real estate	(218		)	(523		)	(618		)	(929		)
Consumer	(53		)	(5		)	(107		)	(17		)
Total charged-off	(2,042		)	(1,974		)	(2,889		)	(4,041		)
Net recoveries	2,958			1,531			4,140			1,880
Balance at end of period	$	115,056		$	105,937		$	115,056		$	105,937
Net recoveries to average loans outstanding - annualized	0.13		%	0.09		%	0.19		%	0.11		%
Allowance for credit losses to gross loans	1.11			1.49

The following table summarizes the allocation of the allowance for credit losses by loan type. However, the allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. 

	June 30, 2015						December 31, 2014
	Amount		Percent of Total Allowance for Credit Loss		Percent of Loans to Total HFI Loans		Amount		Percent of Total Allowance for Credit Loss		Percent of Loans to Total HFI Loans
	(dollars in thousands)
Commercial and industrial	$	59,589	51.7	%	46.2	%	$	54,566	49.5	%	42.1	%
Commercial real estate	28,946		25.2		40.8		28,783		26.1		45.0
Construction and land development	19,537		17.0		9.7		18,558		16.8		8.9
Residential real estate	6,399		5.6		3.1		7,456		6.8		3.6
Consumer	585		0.5		0.2		853		0.8		0.4
Total	$	115,056	100.0	%	100.0	%	$	110,216	100.0	%	100.0	%

The allowance for credit losses as a percentage of total loans decreased to 1.11% at June 30, 2015 from 1.31% at December 31, 2014. The total balance of the allowance for credit losses has increased due to the increase in the size of the loan portfolio. However, the increase in the allowance is not proportional to the increase in the portfolio as the Company has experienced improved credit quality in its portfolio as reflected in net recoveries achieved during the three and six months ended June 30, 2015 as well as a change in portfolio mix toward higher rated credits.

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Potential Problem Loans

The Company classifies loans consistent with federal banking regulations using a nine category grading system. These loan grades are described in further detail in "Item 1. Business” of the Company's Annual Report on Form 10-K for the year ended December 31, 2014. The following table presents information regarding potential problem loans, consisting of loans graded Special Mention, Substandard, Doubtful, and Loss, but still performing, and excluding acquired loans: 

	June 30, 2015
	Number of Loans	Loan Balance		Percent		Percent of Total HFI Loans
	(dollars in thousands)
Commercial and industrial	120	$	54,098	50.14	%	0.53	%
Commercial real estate	56	45,758		42.42		0.45
Construction and land development	3	2,080		1.93		0.02
Residential real estate	16	5,505		5.10		0.05
Consumer	9	437		0.41		—
Total	204	$	107,878	100.00	%	1.05	%

	At December 31, 2014
	Number of Loans	Loan Balance		Percent		Percent of Total HFI Loans
	(dollars in thousands)
Commercial and industrial	76	$	24,060	23.89	%	0.29	%
Commercial real estate	55	53,514		53.14		0.64
Construction and land development	6	15,646		15.53		0.19
Residential real estate	16	7,121		7.07		0.08
Consumer	10	377		0.37		—
Total	163	$	100,718	100.00	%	1.20	%

Total potential problem loans are primarily secured by real estate.

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Other Assets Acquired Through Foreclosure

The following table represents the changes in other assets acquired through foreclosure: 

	Three Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	77,968		$	(14,209	)	$	63,759
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	5,739			—			5,739
Proceeds from sale of other real estate owned and repossessed assets, net	(15,415		)	2,480			(12,935		)
Valuation adjustments, net	—			(718		)	(718		)
Gains, net (1)	1,940			—			1,940
Balance, end of period	71,782			(12,447		)	59,335
	2014
Balance, beginning of period	$	72,226		$	(15,776	)	$	56,450
Transfers to other assets acquired through foreclosure, net	4,309			—			4,309
Proceeds from sale of other real estate owned and repossessed assets, net	(1,903		)	683			(1,220		)
Valuation adjustments, net	—			(258		)	(258		)
Gains, net (1)	11			—			11
Balance, end of period	$	74,643		$	(15,351	)	$	59,292
	Six Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	13,459			—			13,459
Proceeds from sale of other real estate owned and repossessed assets, net	(17,703		)	3,328			(14,375		)
Valuation adjustments, net	—			(1,504		)	(1,504		)
Gains, net (2)	3,055			—			3,055
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	6,419			—			6,419
Proceeds from sale of other real estate owned and repossessed assets, net	(21,376		)	6,644			(14,732		)
Valuation adjustments, net	—			(293		)	(293		)
Gains, net (2)	1,179			—			1,179
Balance, end of period	$	74,643		$	(15,351	)	$	59,292

(1) Includes net gains related to initial transfers to other assets of zero during both the three months ended June 30, 2015 and 2014, pursuant to accounting guidance.

(2) Includes net gains related to initial transfers to other assets of $0.6 million and zero during the six months ended June 30, 2015 and 2014, respectively, pursuant to accounting guidance.

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. OREO and other repossessed property are reported at the lower of carrying value or fair value less estimated costs to sell the property. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense.

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The Company had $59.3 million and $57.2 million of such assets at June 30, 2015 and December 31, 2014. At June 30, 2015, the Company held 56 OREO properties, compared to 67 at December 31, 2014.

Goodwill and Other Intangible Assets

Goodwill represents the excess consideration paid for net assets acquired in a business combination over their fair value and is subsequently evaluated for impairment at least annually. The Company has goodwill of $282.9 million, which includes $259.6 million acquired in the Bridge acquisition. Intangible assets total $17.1 million at June 30, 2015, which includes $15.0 million acquired in the Bridge acquisition. The goodwill and intangible balances at June 30, 2015 are allocated to the Nevada, Northern California, and CBL operating segments. See "Note 2. Mergers, Acquisitions and Dispositions" for further discussion of the Bridge acquisition and the allocation of goodwill and intangible assets acquired.

The Company performs its annual goodwill and intangibles impairment tests as of October 1 each year, or more often if events or circumstances indicate that the carrying value may not be recoverable. During the three and six months ended June 30, 2015 and 2014, there were no events or circumstances that indicated an interim impairment test of goodwill or other intangible assets was necessary.

Deferred Tax Assets

Deferred tax assets and liabilities are determined based on differences between the financial reporting and income tax bases of assets (other than non-deductible goodwill) and liabilities. Deferred tax assets are measured using the income tax rate expected to be in effect when the taxes are actually paid or recovered. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted. Deferred tax assets are recorded to the extent these assets are more-likely-than-not to be realized.

See "Note 12. Income Taxes" to the Consolidated Financial Statements for further discussion on income taxes.

Deposits

Deposits are the primary source for funding the Company's asset growth. Total deposits increased to $11.41 billion at June 30, 2015, from $8.93 billion at December 31, 2014, an increase of $2.48 billion, or 27.7%. This increase was primarily due to the Bridge acquisition of $1.74 billion deposits. The non-interest-bearing demand deposit and savings and money market increased by $1.64 billion and $864.2 million, respectively.

WAB is a member of Promontory, a network that offers deposit placement services such as CDARS and ICS services, which offer products that qualify for FDIC insurance on large deposits. At June 30, 2015, the Company had $599.3 million of CDARS deposits and $748.9 million of ICS deposits, compared to $700.7 million of CDARS deposits and $479.2 million of ICS deposits at December 31, 2014. At June 30, 2015 and December 31, 2014, the Company also had $397.3 million and $321.5 million, respectively, of wholesale brokered deposits.

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The average balances and weighted average rates paid on deposits are presented below:

	Three Months Ended June 30,
	2015				2014
	Average Balance		Rate		Average Balance		Rate
	(dollars in thousands)
Interest checking (NOW)	$	971,609	0.17	%	$	791,501	0.19	%
Savings and money market	4,213,013		0.28		3,583,500		0.30
Time	1,834,352		0.43		1,700,412		0.44
Total interest-bearing deposits	7,018,974		0.31		6,075,413		0.32
Non-interest-bearing demand deposits	2,593,543		—		2,045,534		—
Total deposits	$	9,612,517	0.22	%	$	8,120,947	0.24	%
	Six Months Ended June 30,
	2015				2014
	Average Balance		Rate		Average Balance		Rate
	(dollars in thousands)
Interest checking (NOW)	$	945,943	0.17	%	$	778,341	0.20	%
Savings and money market	4,062,052		0.28		3,518,279		0.30
Time	1,884,643		0.42		1,660,212		0.43
Total interest-bearing deposits	6,892,638		0.30		5,956,832		0.32
Non-interest-bearing demand deposits	2,482,314		—		2,049,806		—
Total deposits	$	9,374,952	0.22	%	$	8,006,638	0.24	%

Securities Sold Short

During the second quarter of 2015, the Company entered into a Treasury short transaction to mitigate the interest rate risk profile of floating-rate loans that are currently priced at their floor rate. The Company sold short fixed-rate Treasury securities and invested the proceeds in a short-term repurchase agreement. The balance was $57.6 million at June 30, 2015.

Other Borrowings

The Company from time to time utilizes short-term borrowed funds to support short-term liquidity needs generally created by increased loan demand. The majority of these short-term borrowed funds consist of advances from the FHLB and FRB, federal funds purchased, and customer repurchase agreements. The Company’s borrowing capacity with the FHLB and FRB is determined based on collateral pledged, generally consisting of securities and loans. In addition, the Company has borrowing capacity from other sources, collateralized by securities, including securities sold under agreements to repurchase, which are reflected at the amount of cash received in connection with the transaction, and may require additional collateral based on the fair value of the underlying securities. At June 30, 2015, total short-term borrowed funds consisted of customer repurchases of $42.2 million, FHLB advances of $11.1 million, and Senior Notes of $58.4 million, maturing in September 2015. At December 31, 2014, total short-term borrowed funds consisted of customer repurchases of $54.9 million, Senior Notes with a carrying value of $58.2 million, a revolving line of credit of $25.0 million, and FHLB advances of $97.0 million.

At June 30, 2015, the Company did not have FHLB advances classified as long-term. At December 31, 2014, total long-term debt consisted of $210.1 million of FHLB advances.

Qualifying Debt

At June 30, 2015, total qualifying debt consisted of $150.0 million of subordinated debt, recorded net of debt issuance costs of $1.6 million, and junior subordinated debt of $59.8 million. At December 31, 2014, qualifying debt consisted of junior subordinated debt of $40.4 million.

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Critical Accounting Policies

Critical accounting policies are defined as those that are reflective of significant judgments and uncertainties and could potentially result in materially different results under different assumptions and conditions. The critical accounting policies upon which the Company's financial condition and results of operations depend, and which involve the most complex subjective decisions or assessments, are included in the discussion entitled "Critical Accounting Policies" in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations," in the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2014, and all amendments thereto, as filed with the SEC. There were no material changes to the critical accounting policies disclosed in the Annual Report on Form 10-K.

Liquidity

Liquidity is the ongoing ability to accommodate liability maturities and deposit withdrawals, fund asset growth, and business operations and meet contractual obligations through unconstrained access to funding at reasonable market rates. Liquidity management involves forecasting funding requirements and maintaining sufficient capacity to meet the needs and accommodate fluctuations in asset and liability levels due to changes in our business operations or unanticipated events.

The ability to have readily available funds sufficient to repay fully maturing liabilities is of primary importance to depositors, creditors, and regulators. Our liquidity, represented by cash and amounts due from banks, federal funds sold, and non-pledged marketable securities, is a result of our operating, investing, and financing activities and related cash flows. In order to ensure funds are available when necessary, on at least a quarterly basis, we project the amount of funds that will be required over a twelve month period and we strive to maintain relationships with a diversified customer base. Liquidity requirements can also be met through short-term borrowings or the disposition of short-term assets.

The following table presents the available and outstanding balances of the Company's lines of credit:

	June 30, 2015
	Available Balance		Outstanding Balance
	(in millions)
Unsecured fed funds credit lines at correspondent banks	$	100.0	$	—
Other lines with correspondent banks:
Secured other lines with correspondent banks	$	25.0	$	—
Unsecured other lines with correspondent banks	45.0		—
Total other lines with correspondent banks	$	70.0	$	—

In addition to lines of credit, the Company has borrowing capacity with the FHLB and FRB from pledged loans and securities. The borrowing capacity, outstanding borrowings, and available credit as of June 30, 2015 are presented in the following table:

	June 30, 2015
	(in millions)
FHLB:
Borrowing capacity	$	1,965.2
Outstanding borrowings	11.0
Letters of credit	422.9
Total available credit	$	1,531.3
FRB:
Borrowing capacity	$	1,627.0
Outstanding borrowings	—
Total available credit	$	1,627.0

The Company has a formal liquidity policy and, in the opinion of management, our liquid assets are considered adequate to meet cash flow needs for loan funding and deposit cash withdrawals for the next 90-120 days. At June 30, 2015, there was $1.52 billion in liquid assets, comprised of $701.2 million in cash, cash equivalents, and money market investments and $823.1 million in unpledged marketable securities. At December 31, 2014, the Company maintained $862.5 million in liquid assets,

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comprised of $165.3 million of cash, cash equivalents, and money market investments, and $697.2 million of unpledged marketable securities.

The Parent maintains liquidity that would be sufficient to fund its operations and certain non-bank affiliate operations for an extended period should funding from normal sources be disrupted. Since deposits are taken by WAB and not by the Parent, Parent liquidity is not dependent on the bank's deposit balances. In our analysis of Parent liquidity, we assume that the Parent is unable to generate funds from additional debt or equity issuances, receives no dividend income from subsidiaries and does not pay dividends to stockholders, while continuing to make nondiscretionary payments needed to maintain operations and repayment of contractual principal and interest payments owed by the Parent and affiliated companies. Under this scenario, the amount of time the Parent and its non-bank subsidiary can operate and meet all obligations before the current liquid assets are exhausted is considered as part of the Parent liquidity analysis. Management believes the Parent maintains adequate liquidity capacity to operate without additional funding from new sources for over 12 months. WAB maintains sufficient funding capacity to address large increases in funding requirements, such as deposit outflows. This capacity is comprised of liquidity derived from a reduction in asset levels and various secured funding sources.

On a long-term basis, the Company’s liquidity will be met by changing the relative distribution of our asset portfolios (for example, by reducing investment or loan volumes, or selling or encumbering assets). Further, the Company can increase liquidity by soliciting higher levels of deposit accounts through promotional activities and/or borrowing from correspondent banks, the FHLB of San Francisco, and the FRB. At June 30, 2015, our long-term liquidity needs primarily relate to funds required to support loan originations, commitments, and deposit withdrawals, which can be met by cash flows from investment payments and maturities, and investment sales, if necessary.

The Company’s liquidity is comprised of three primary classifications: 1) cash flows provided by operating activities; 2) cash flows used in investing activities; and 3) cash flows provided by financing activities. Net cash provided by or used in operating activities consists primarily of net income, adjusted for changes in certain other asset and liability accounts and certain non-cash income and expense items, such as the provision for credit losses, investment and other amortization and depreciation. For the six months ended June 30, 2015 and 2014, net cash provided by operating activities was $77.0 million and $60.5 million, respectively.

Our primary investing activities are the origination of real estate and commercial loans and the purchase and sale of securities. Our net cash provided by and used in investing activities has been primarily influenced by our loan and securities activities. The net increase in loans for the six months ended June 30, 2015 and 2014, was $515.1 million and $719.7 million, respectively. There was a net decrease in investment securities for the six months ended June 30, 2015 and 2014, of $97.8 million and $119.5 million, respectively.

Net cash provided by financing activities has been impacted significantly by increased deposit levels. During the six months ended June 30, 2015 and 2014, deposits increased $733.8 million and $631.6 million, respectively. Also, during the six months ended June 30, 2015, WAB issued $150.0 million of subordinated debt, receiving proceeds of $148.5 million.

Fluctuations in core deposit levels may increase our need for liquidity as certificates of deposit mature or are withdrawn before maturity, and as non-maturity deposits, such as checking and savings account balances, are withdrawn. Additionally, we are exposed to the risk that customers with large deposit balances will withdraw all or a portion of such deposits, due in part to the FDIC limitations on the amount of insurance coverage provided to depositors. To mitigate the uninsured deposit risk, we have joined the CDARS and ICS programs, which allow an individual customer to invest up to $50.0 million and $110.0 million, respectively, through one participating financial institution or, a combined total of $150.0 million per individual customer, with the entire amount being covered by FDIC insurance. As of June 30, 2015, we had $599.3 million of CDARS and $748.9 million of ICS deposits.

As of June 30, 2015, we had $397.3 million of wholesale brokered deposits outstanding. Brokered deposits are generally considered to be deposits that have been received from a third party that is acting on behalf of that party’s customer. Often, a broker will direct a customer’s deposits to the banking institution offering the highest interest rate available. Federal banking laws and regulations place restrictions on depository institutions regarding brokered deposits because of the general concern that these deposits are at a greater risk of being withdrawn and placed on deposit at another institution offering a higher interest rate, thus posing liquidity risk for institutions that gather brokered deposits in significant amounts.

Federal and state banking regulations place certain restrictions on dividends paid. The total amount of dividends which may be paid at any date is generally limited to the retained earnings of the bank. Dividends paid by WAB to the Parent would be prohibited if the effect thereof would cause the bank’s capital to be reduced below applicable minimum capital requirements. WAB and LVSP paid dividends to the Parent in the amount of $82.0 million and $6.5 million, respectively, during the six months ended June 30, 2015. Subsequent to June 30, 2015, WAB paid a $30.0 million dividend to the Parent.

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Capital Resources

The Company and WAB are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and WAB must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of common equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets.

As of June 30, 2015 and December 31, 2014, the Company and WAB exceeded the capital levels necessary to be classified as well-capitalized, as defined by the banking agencies. The actual capital amounts and ratios for the Company and WAB are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
June 30, 2015
WAL	$	1,522,991	$	1,269,033	$	12,435,603	$	12,733,458	12.2	%	10.2	%	10.0	%	9.1	%
WAB	1,408,273		1,142,684		12,326,696		12,549,292		11.4		9.3		9.1		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

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Item 3. Quantitative and Qualitative Disclosures about Market Risk.

Market risk is the risk of loss in a financial instrument arising from adverse changes in market prices and rates, foreign currency exchange rates, commodity prices, and equity prices. Our market risk arises primarily from interest rate risk inherent in our lending, investing, and deposit taking activities. To that end, management actively monitors and manages our interest rate risk exposure. We generally manage our interest rate sensitivity by evaluating re-pricing opportunities on our earning assets to those on our funding liabilities.

Management uses various asset/liability strategies to manage the re-pricing characteristics of our assets and liabilities, all of which are designed to ensure that exposure to interest rate fluctuations is limited to within our guidelines of acceptable levels of risk-taking. Hedging strategies, including the terms and pricing of loans and deposits and management of the deployment of our securities, are used to reduce mismatches in interest rate re-pricing opportunities of portfolio assets and their funding sources.

Interest rate risk is addressed by the ALCO or its equivalent, which includes members of executive management, finance, and operations. ALCO monitors interest rate risk by analyzing the potential impact on the net EVE and net interest income from potential changes in interest rates and considers the impact of alternative strategies or changes in balance sheet structure. We manage our balance sheet in part to maintain the potential impact on EVE and net interest income within acceptable ranges despite changes in interest rates.

Our exposure to interest rate risk is reviewed at least quarterly by the ALCO. Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in both EVE and net interest income in the event of hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the bank’s BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within Board-approved limits.

Net Interest Income Simulation. In order to measure interest rate risk at June 30, 2015, we used a simulation model to project changes in net interest income that result from forecasted changes in interest rates. This analysis, which includes Bridge, calculates the difference between a baseline net interest income forecast using current yield curves compared to forecasted net income resulting from an immediate parallel shift in rates upward or downward. The income simulation model includes various assumptions regarding the re-pricing relationships for each of our products. Many of our assets are floating rate loans, which are assumed to re-price immediately and, proportional to the change in market rates, depending on their contracted index. Some loans and investments include the opportunity of prepayment (embedded options) and, accordingly, the simulation model uses estimated market speeds to derive prepayments and reinvests proceeds at modeled yields. Our non-term deposit products re-price more slowly, usually changing less than the change in market rates and at our discretion.

This analysis indicates the impact of changes in net interest income for the given set of rate changes and assumptions. It assumes the balance sheet remains static and that its structure does not change over the course of the year. It does not account for all factors that could impact our results, including changes by management to mitigate interest rate changes or secondary factors such as changes to our credit risk profile as interest rates change.

Furthermore, loan prepayment rate estimates and spread relationships change regularly. Interest rate changes create changes in actual loan prepayment speeds that will differ from the market estimates incorporated in this analysis. Changes that vary significantly from the modeled assumptions may have significant effects on our actual net interest income.

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This simulation model assesses the changes in net interest income that would occur in response to an instantaneous and sustained increase or decrease (shock) in market interest rates. At June 30, 2015, our net interest income exposure for the next twelve months related to these hypothetical changes in market interest rates was within our current guidelines.

Sensitivity of Net Interest Income

	Interest Rate Scenario (change in basis points from Base)
	Down 100			Base		Up 100			Up 200			Up 300			Up 400
	(in thousands)
Interest Income	$	533,153		$	543,476	$	596,971		$	657,825		$	689,981		$	744,975
Interest Expense	29,140			29,585		61,830			93,862			125,899			157,941
Net Interest Income	504,013			513,891		535,141			563,963			564,082			587,034
% Change	(1.9		)%			4.1		%	9.7		%	9.8		%	14.2		%

Economic Value of Equity. We measure the impact of market interest rate changes on the NPV of estimated cash flows from our assets, liabilities, and off-balance sheet items, defined as EVE, using a simulation model. This simulation model, which includes Bridge, assesses the changes in the market value of interest rate sensitive financial instruments that would occur in response to an instantaneous and sustained increase or decrease (shock) in market interest rates.

At June 30, 2015, our EVE exposure related to these hypothetical changes in market interest rates was within the current guidelines established by us. The following table shows our projected change in EVE for this set of rate shocks at June 30, 2015:

Economic Value of Equity

	Interest Rate Scenario (change in basis points from Base)
	Down 100			Base		Up 100			Up 200			Up 300			Up 400
	(in thousands)
Assets	$	13,633,180		$	13,471,721	$	13,259,846		$	13,052,212		$	12,840,489		$	12,639,538
Liabilities	11,475,939			11,184,288		10,934,405			10,712,413			10,508,066			10,319,458
Net Present Value	2,157,241			2,287,433		2,325,441			2,339,799			2,332,423			2,320,080
% Change	(5.7		)%			1.7		%	2.3		%	2.0		%	1.4		%

The computation of prospective effects of hypothetical interest rate changes are based on numerous assumptions, including relative levels of market interest rates, asset prepayments, and deposit decay, and should not be relied upon as indicative of actual results. Further, the computations do not contemplate any actions we may undertake in response to changes in interest rates. Actual amounts may differ from the projections set forth above should market conditions vary from the underlying assumptions.

Derivative Contracts. In the normal course of business, the Company uses derivative instruments to meet the needs of its customers and manage exposure to fluctuations in interest rates. The following table summarizes the aggregate notional amounts, market values, and terms of the Company’s derivative positions with derivative market makers as of June 30, 2015 and December 31, 2014:

Outstanding Derivatives Positions

June 30, 2015						December 31, 2014
Notional		Net Value			Weighted Average Term (Years)	Notional		Net Value			Weighted Average Term (Years)
(dollars in thousands)
$	828,036	$	(48,839	)	14.9	$	647,703	$	(57,813	)	17.6

93

Item 4. Controls and Procedures.

Evaluation of Disclosure Controls

Based on their evaluation as of the end of the period covered by this Quarterly Report on Form 10-Q, the CEO and CFO have concluded that the disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) of the Exchange Act) are effective to ensure that information required to be disclosed by the Company in reports that we file or submit under the Exchange Act, as amended, is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms. Additionally, our disclosure controls and procedures were also effective in ensuring that information required to be disclosed by the Company in the reports we file or subject under the Exchange Act is accumulated and communicated to our management, including the CEO and CFO, to allow timely decisions regarding required disclosures. We completed the Bridge acquisition on June 30, 2015. Bridge was excluded from our evaluation in accordance with the SEC's general guidance that a recently acquired business may be omitted from the scope of the assessment for a period of up to one year from the date of acquisition.

Changes in Internal Control over Financial Reporting

There have not been any changes in the Company's internal control over financial reporting during the quarter ended June 30, 2015, which have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

94

PART II. OTHER INFORMATION

Item 1. Legal Proceedings.

There are no material pending legal proceedings to which the Company is a party or to which any of our properties are subject. There are no material proceedings known to us to be contemplated by any governmental authority. From time to time, we are involved in a variety of litigation matters in the ordinary course of our business and anticipate that we will become involved in new litigation matters in the future.

Item 1A. Risk Factors.

There have not been any material changes to the risk factors previously disclosed in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.

95

Item 6. Exhibits.

EXHIBITS

2.1	Agreement and Plan of Merger, dated as of August 17, 2012, by and between Western Alliance Bancorporation, or Western Alliance, and Western Liberty Bancorp (incorporated by reference to Exhibit 2.1 to Western Alliance’s Form 8-K filed with the SEC on August 22, 2012).
2.2	Agreement and Plan of Merger, dated as of January 18, 2013, by and between Western Alliance Bank, LandAmerica Financial Group, Inc., Orange County Bancorp and Centennial Bank (incorporated by reference to Exhibit 2.1 of Western Alliance’s Form 8-K filed with the SEC on January 22, 2013).
2.3	Plan of Conversion, dated May 29, 2014 (incorporated by reference to Exhibit 2.1 of Western Alliance Bancorporation’s Form 8-K filed with the SEC on June 3, 2014).
2.4	Agreement and Plan of Merger, dated as of March 9, 2015, by and between Western Alliance Bancorporation and Bridge Capital Holdings (incorporated by reference to Exhibit 2.1 of Western Alliance’s Form 8-K filed with the SEC on March 13, 2015).
2.5	Letter of Agreement, effective as of June 22, 2015 (incorporated by reference to Exhibit 2.1 of Western Alliance's Form 8-K filed with the SEC on June 22, 2015).
3.1	Articles of Conversion, as filed with the Nevada Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.1 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.2	Certificate of Conversion, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.2 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.3	Certificate of Incorporation, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.3 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.4	Certificate of Designation of Non-Cumulative Perpetual Preferred Stock, Series B, as filed with the Delaware Secretary of State on May 29, 2014 (incorporated by reference to Exhibit 3.4 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
3.5	Certificate of Amendment of Certificate of Incorporation of Western Alliance Bancorporation, effective as of May 19, 2015 (incorporated by reference to Exhibit 3.1 of Western Alliance's Form 8-K filed with the SEC on May 22, 2015).
3.6	Amended and Restated Bylaws of Western Alliance Bancorporation, effective as of May 19, 2015 (incorporated by reference to Exhibit 3.2 of Western Alliance's Form 8-K filed with the SEC on May 22, 2015).
4.1	Form of Common Stock Certificate (incorporated by reference to Exhibit 4.1 of Western Alliance’s Form 8-K filed with the SEC on June 3, 2014).
4.2	Senior Debt Indenture, dated August 25, 2010, between Western Alliance Bancorporation and Wells Fargo Bank, National Association, as trustee. (incorporated by reference to Exhibit 4.1 of Western Alliance’s Form 8-K filed with the SEC on August 25, 2010).
4.3	First Supplemental Indenture, dated August 25, 2010, between Western Alliance Bancorporation and Wells Fargo Bank, National Association, as trustee. (incorporated by reference to Exhibit 4.2 of Western Alliance’s Form 8-K filed with the SEC on August 25, 2010).
4.4	Form of 10.00% Senior Notes due 2015 (incorporated by reference to Exhibit 4.3 of Western Alliance’s Form 8-K filed with the SEC on August 25, 2010).
4.5	Form of Non-Cumulative Perpetual Preferred Stock, Series B, stock certificate (incorporated by reference to Exhibit 4.8 of Western Alliance’s Annual Report on form 10-K filed with the SEC on March 2, 2012).
31.1*	CEO Certification Pursuant Rule 13a-14(a)/15d-14(a).
31.2*	CFO Certification Pursuant Rule 13a-14(a)/15d-14(a).
32**	CEO and CFO Certification Pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes Oxley Act of 2002.

96

101.INS*	XBRL Instance Document.
101.SCH*	XBRL Taxonomy Extension Schema Document.
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document.
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document.
101.LAB*	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE*	XBRL Taxonomy Extension Presentation Linkbase Document.

* Filed herewith.

**Furnished herewith.

97

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	WESTERN ALLIANCE BANCORPORATION
August 7, 2015	By:	/s/ Robert Sarver
		Robert Sarver
		Chairman of the Board and
		Chief Executive Officer
August 7, 2015	By:	/s/ Dale Gibbons
		Dale Gibbons
		Executive Vice President and
		Chief Financial Officer
August 7, 2015	By:	/s/ J. Kelly Ardrey Jr.
		J. Kelly Ardrey Jr.
		Senior Vice President and
		Chief Accounting Officer

98

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Robert Sarver, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Western Alliance Bancorporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/s/ Robert Sarver
		Robert Sarver
		Chief Executive Officer
Date:	August 7, 2015	Western Alliance Bancorporation

EX-31.2

EXHIBIT 31.2

CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Dale Gibbons, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Western Alliance Bancorporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

		/s/ Dale Gibbons
		Dale Gibbons
		Chief Financial Officer
Date:	August 7, 2015	Western Alliance Bancorporation

EX-32

EXHIBIT 32

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

This certification is given by the undersigned Chief Executive Officer and Chief Financial Officer of Western Alliance Bancorporation (the “Registrant”) pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002. Each of the undersigned hereby certifies, with respect to the Registrant's quarterly report on Form 10-Q for the period ended June 30, 2015, as filed with the Securities and Exchange Commission on the date hereof (the "Report"), that, to each of their knowledge:

1. The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date:	August 7, 2015	/s/ Robert Sarver
		Chief Executive Officer
		Western Alliance Bancorporation
Date:	August 7, 2015	/s/ Dale Gibbons
		Chief Financial Officer
		Western Alliance Bancorporation

XML

Mergers, Acquisitions and Dispositions - Summary of Operating Results of Discontinued Operations (Detail) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) $ / shares	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss		$ 0	$ (504)	$ 0	$ (1,158)
Acquisition / restructure expense		7,842	26	8,001	183
Assets	$ 13,470,104	13,470,104	10,023,600	13,470,104	10,023,600	$ 10,600,498
Deposits	11,406,728	11,406,728	8,469,500	11,406,728	8,469,500	8,931,043
Cash Acquired from Acquisition	342,427			342,427	0
Business Combination, Acquired Receivables, Fair Value	1,447,135	1,447,135		1,447,135
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	59,769	59,769		59,769		40,437
PartnersFirst [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Affinity card revenue			(214)		(358)
Non-interest expenses			(511)		(1,369)
Loss before income taxes			(725)		(1,727)
Income tax benefit			(221)		(569)
Net loss			$ (504)		$ (1,158)
Bridge Capital Holdings [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Excluding Goodwill	1,969,893	1,969,893		1,969,893
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,742,031	1,742,031		1,742,031
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Repossessed Assets	1,550	1,550		1,550
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	420,354
Business Combination, Consideration Transferred, Liabilities Incurred	10,676
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 378,966	378,966		378,966
Business Acquisition Share Exchange Ratio	0.8145
Business Acquisition Cash Consideration Per Share | $ / shares	$ 2.39
Payments to Acquire Businesses, Gross	$ 36,539
Acquisition / restructure expense		5,624		6,814
Business Combination, Acquired Receivables, Fair Value	1,447,135	1,447,135		1,447,135
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	17,527	17,527		17,527		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	61,349	61,349		61,349
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Stock Investment	7,015	7,015		7,015
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance	17,385	17,385		17,385
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investment in Low Income Housing Tax Credits	5,648	5,648		5,648
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt	$ 11,287	$ 11,287		$ 11,287		$ 0

XML

Loans, Leases and Allowance for Credit Losses - Recorded Investment in Loans Classified as Impaired (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Receivables [Abstract]
Impaired loans with an allowance recorded	[1]	$ 106,369	$ 124,928
Impaired loans with no allowance recorded	[2]	44,780	41,822
Total impaired loans		151,149	166,750
Valuation allowance related to impaired loans	[3]	$ (7,157)	$ (10,765)

[1] Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

[3] Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

XML

Investment Securities - Gross Gains and (Losses) on Sales of Investments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Gross gains	$ 55	$ 0	$ 1,103	$ 366
Gross (losses)	0	(163)	(459)	(163)
Net (losses) gains	$ 55	$ (163)	$ 644	$ 203

XML

Other Borrowings - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt [Line Items]
Line of Credit Facility, Interest Rate at Period End					1.75%
FHLB advances	$ 11,051		$ 11,051		$ 96,987
Weighted average interest rate of FHLB and FRB Short-term advances			1.61%		1.24%
Public offering	58,400		$ 58,400
Long-term Debt, Weighted Average Interest Rate					1.06%
Revolving line of credit	$ 0		$ 0		$ 25,000
Short-term Debt, Weighted Average Interest Rate	8.67%		8.67%		4.15%
Repayments of Debt	$ 200,000
Gains (Losses) on Extinguishment of Debt	(81)	$ 0	$ (81)	$ 0
Fed Funds With Other Institutions [Member]
Debt [Line Items]
Revolving line of credit	0		0
Secured borrowing credit line	100,000		100,000
FRB [Member]
Debt [Line Items]
Additional available credit with the entity	1,630,000		1,630,000		$ 1,150,000
Other Credit Facilities [Member]
Debt [Line Items]
Secured borrowing credit line	70,000		70,000
Secured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line	25,000		25,000
Unsecured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line	45,000		45,000
FHLB [Member]
Debt [Line Items]
Additional available credit with the entity	1,530,000		1,530,000		935,000
Long-term Debt	$ 0		$ 0		$ 210,094

XML

Loans, Leases and Allowance for Credit Losses - Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	$ 151,149	$ 166,750
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	22,611	19,300
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	324	363
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	34,336	44,893
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	59,025	66,324
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	0	0
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	11,807	13,749
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	11,806	13,749
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	3,930	373
Construction and land development [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	$ 19,117	$ 21,748

XML

Stockholders' Equity Share-Based Compensation - Stock Options (Details) - Jun. 30, 2015 - Bridge Capital Holdings [Member] - Employee Stock Option [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	33.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years 7 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 19.06

XML

Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($)		Jun. 30, 2015		Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		$ 1,478,234,000		$ 1,520,237,000
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		292,413,000		299,037,000
Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		871,357,000		891,189,000
Securities measured at fair value		1,701,000		1,858,000
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		13,209,000		2,147,000
Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		102,071,000		70,243,000
Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		4,979,000		5,149,000
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014				37,702,000
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		24,609,000		18,346,000
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		3,891,000
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		83,051,000		82,612,000
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		25,648,000		25,546,000
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		10,804,000		11,445,000
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		13,665,000		52,489,000
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		32,537,000		24,332,000
Rated Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		1,478,234,000	[1]	1,520,237,000	[2]
Rated Securities [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		292,413,000		299,037,000
Rated Securities [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		871,357,000		891,189,000
Securities measured at fair value		1,701,000		1,858,000
Rated Securities [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		13,209,000		2,147,000
Rated Securities [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		102,071,000		70,243,000
Rated Securities [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		4,979,000		5,149,000
Rated Securities [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			37,702,000
Rated Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		24,609,000		18,346,000
Rated Securities [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		3,891,000
Rated Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		83,051,000		82,612,000
Rated Securities [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		25,648,000		25,546,000
Rated Securities [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		10,804,000		11,445,000
Rated Securities [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		13,665,000
Rated Securities [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		32,537,000		24,332,000
AAA [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		85,119,000	[1]	73,261,000	[2]
AAA [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		9,284,000		8,168,000
AAA [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		70,856,000		59,944,000
AAA [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		4,979,000		5,149,000
AAA [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			0
AAA [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
AAA [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AAA [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
AAA [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		913,066,000	[1]	911,682,000	[2]
Split-rated AAA/AA Plus [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		871,357,000		891,189,000
Securities measured at fair value		1,701,000		1,858,000
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		13,209,000		2,147,000
Split-rated AAA/AA Plus [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			0
Split-rated AAA/AA Plus [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		24,609,000		18,346,000
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		3,891,000
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Split-rated AAA/AA Plus [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		148,635,000	[1]	141,083,000	[2]
AA Plus to AA- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		145,706,000		138,256,000
AA Plus to AA- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		181,000		68,000
AA Plus to AA- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			0
AA Plus to AA- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
AA Plus to AA- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
AA Plus to AA- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		2,748,000
AA Plus to AA- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		153,080,000	[1]	155,164,000	[2]
A Plus to A- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		131,055,000		146,155,000
A Plus to A- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		11,434,000		3,439,000
A Plus to A- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			0
A Plus to A- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
A Plus to A- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
A Plus to A- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		10,591,000
A Plus to A- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		103,023,000	[1]	171,851,000	[2]
BBB Plus to BBB- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		6,183,000		6,263,000
BBB Plus to BBB- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		15,969,000		3,595,000
BBB Plus to BBB- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			37,702,000
BBB Plus to BBB- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		55,223,000		54,585,000
BBB Plus to BBB- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		25,648,000		25,546,000
BBB Plus to BBB- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BBB Plus to BBB- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
BBB Plus to BBB- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		32,539,000	[1]	32,469,000	[2]
BB Plus and below [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		185,000		195,000
BB Plus and below [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		3,488,000		3,197,000
BB Plus and below [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			0
BB Plus and below [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
BB Plus and below [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		18,062,000		17,632,000
BB Plus and below [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
BB Plus and below [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		10,804,000		11,445,000
BB Plus and below [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
BB Plus and below [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		42,772,000	[1]	34,727,000	[2]
Corporate Credit Quality Indicator Unrated [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Securities measured at fair value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		143,000		0
Corporate Credit Quality Indicator Unrated [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	[3]			0
Corporate Credit Quality Indicator Unrated [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		9,766,000		10,395,000
Corporate Credit Quality Indicator Unrated [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		0		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		326,000
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		$ 32,537,000		$ 24,332,000

[1] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ

[2] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

[3] At least 80% of mutual funds are investment grade corporate debt securities.

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Earnings per Share (Tables)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table presents the calculation of basic and diluted EPS: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Weighted average shares - basic	88,177		86,501		88,059		86,379
Dilutive effect of stock awards	505		832		508		850
Weighted average shares - diluted	88,682		87,333		88,567		87,229
Net income available to common stockholders	$	34,472	$	35,186	$	74,486	$	65,918
Earnings per share - basic	0.39		0.41		0.85		0.76
Earnings per share - diluted	0.39		0.40		0.84		0.76

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Derivatives and Hedging Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Derivatives, Fair Value [Line Items]
Notional Amount		$ 828,036	$ 647,703	$ 568,006
Derivative Asset, Fair Value		198	7	2
Derivative Liability, Fair Value		49,037	57,820	29,129
Notional Amount, Netting Adjustments	[1]	0	0	0
Derivative Netting Adjustments	[1]	0	0	2
Positive NPVs		198	7	0
Negative NPVs		49,037	57,820	29,127
Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount		828,036	647,703	568,006
Derivative Asset, Fair Value		198	7	2
Derivative Liability, Fair Value		$ 49,037	$ 57,820	$ 29,129

[1] Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

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Qualifying Debt Junior Subordinated Debt (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Debt Instrument [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure	$ 48,482		$ 48,482		$ 40,437
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	59,769		59,769		40,437
Business Combination, Fair Market Value Adjustment on Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	(6,240)		(6,240)		$ 0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(7,745)	$ 123	(8,059)	$ (837)
Long-term Debt, Weighted Average Interest Rate					1.06%
Bridge Capital Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	12,372		12,372		$ 0
Bridge Capital Trust II [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 5,155		$ 5,155		$ 0
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate	2.62%		2.62%		2.73%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure	$ 48,482		$ 48,482		$ 40,437
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	66,497		66,497		66,497
Unrealized gain or loss on junior subordinated debt [Line Items]	(18,015)		(18,015)		(26,060)
Junior Subordinated Debt [Member] | BankWest Nevada Capital Trust II [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	15,464		15,464		15,464
Junior Subordinated Debt [Member] | Intermountain First Statutory Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	10,310		10,310		10,310
Junior Subordinated Debt [Member] | First Independent Capital Trust I [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	7,217		7,217		7,217
Junior Subordinated Debt [Member] | WAL Trust No. 1 [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	20,619		20,619		20,619
Junior Subordinated Debt [Member] | WAL Statutory Trust No. 2 [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	5,155		5,155		5,155
Junior Subordinated Debt [Member] | WAL Statutory Trust No. 3 [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	7,732		7,732		7,732
Bridge Capital Holdings [Member]
Debt Instrument [Line Items]
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	17,527		17,527		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt	11,287		11,287		$ 0
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (7,736)	$ 125	$ (8,045)	$ (853)

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Commitments and Contingencies Concentration of Lending Activities (Details)	Jun. 30, 2015	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Percent of commercial real estate loans owner occupied	48.00%	46.00%

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Loans, Leases and Allowance for Credit Losses - Average Investment in Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	$ 155,943	$ 167,326	$ 159,186	$ 170,010
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	19,838	27,607	19,375	27,203
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	368	505	360	503
Troubled Debt Restructured Loans [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	121,200	123,600	123,600	126,600
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	38,750	34,341	40,839	35,545
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	59,873	68,725	62,636	69,382
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	0	0	0	0
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	12,401	15,438	12,835	15,510
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	4,879	419	2,618	429
Construction and land development [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	0	0	0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	$ 19,834	$ 20,291	$ 20,523	$ 21,438

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Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ (21)	$ 61	$ (241)	$ (76)
Amount reclassified from accumulated other comprehensive income	34	(102)	$ 403	$ 127
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	34	(102)			$ 403	$ 127
Realized Gain Loss On Sale Of Investment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Realized gains on sales of investment securities	55	(163)			644	203
Income Tax Expense [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ (21)	$ 61			$ (241)	$ (76)

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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Percentage of first liens initial loan to value ratio			75.00%
Percent of commercial real estate loans owner occupied	48.00%		48.00%		46.00%
Operating Leases, Rent Expense, Net	$ 1.6	$ 1.7	$ 3.2	$ 3.3
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans			51.00%		54.00%
Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 2.1		$ 2.1

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Derivatives and Hedging Largest Exposure to Individual Counterparty (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Largest gross exposure (positive derivative NPV) to an individual counterparty	$ 198	$ 7	$ 0
Largest individual counterparty [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Largest gross exposure (positive derivative NPV) to an individual counterparty	198	7	2
Collateral posted by this counterparty	0	0	0
Negative derivative NPV with this counterparty	0	0	28,874
Collateral pledged to this counterparty	0	0	28,872
Net exposure after netting adjustments and collateral	$ 198	$ 7	$ 0

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Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - Concentration Risk Benchmark [Domain] - Concentration Risk Type [Domain] - Class of Financing Receivable [Domain] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Other Commitments [Line Items]
Total amount	$ 3,361,502		$ 3,361,502		$ 2,256,117
Operating Leases, Rent Expense, Net	$ 1,600	$ 1,700	$ 3,200	$ 3,300
Percent of commercial real estate loans owner occupied	48.00%		48.00%		46.00%
Standby letters of credit [Member]
Other Commitments [Line Items]
Total amount	$ 73,513		$ 73,513		$ 49,556
Unsecured Letters Of Credit	33,485		33,485		5,166
Credit card guarantees [Member]
Other Commitments [Line Items]
Total amount	57,452		57,452		42,038
Commitments to extend credit [Member]
Other Commitments [Line Items]
Total amount	3,230,537		3,230,537		2,164,523
Unsecured Loan Commitments	$ 358,971		$ 358,971		$ 232,863

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Stockholders' Equity - Summary of Unvested Shares of Restricted Stock and Changes (Detail) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	44,975			335,975
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Aggregate Intrinsic Value	$ 1.4			$ 10.9
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,490,676.000000			1,490,676.000000		1,100,000.0
Allocated Share-based Compensation Expense	$ 2.6		$ 1.9	$ 5.1	$ 3.6
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		285,000
Allocated Share-based Compensation Expense	$ 1.0		0.7	$ 2.0	$ 1.5
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		104,300
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Aggregate Intrinsic Value		$ 2.8
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	514,450			514,450
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				64,000
Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period				52,200
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Grants In Period Aggregate Intrinsic Value				$ 1.4
Allocated Share-based Compensation Expense	$ 0.1		$ 0.0	$ 0.2
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues				0	115,866

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Qualifying Debt (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 29, 2015	Jun. 30, 2015	Jun. 30, 2014
Qualifying Debt [Abstract]
Proceeds from Issuance of Subordinated Long-term Debt	$ 150,000	$ 148,450	$ 0

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Mergers, Acquisitions and Dispositions (Tables)

6 Months Ended

Jun. 30, 2015

Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]

Business Acquisition, Pro Forma Information [Table Text Block]

The following table presents pro forma information as if the Bridge acquisition was completed on January 1, 2014. The pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction and interest expense on deposits acquired. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates. 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Interest income	$	139,080	$	121,744	$	271,502	$	239,072
Non-interest income	1,840		9,578		11,047		16,882
Net income available to common stockholders (1)	45,607		39,452		90,372		73,901
Earnings per share - basic	$	0.45	$	0.40	$	0.89	$	0.74
Earnings per share - diluted	$	0.44	$	0.39	$	0.88	$	0.73

(1) Excludes acquisition / restructure related costs incurred by the Company of $7.8 million and $8.0 million for the three and six months ended June 30, 2015, respectively, and acquisition / restructure related costs incurred by Bridge of $5.6 million and $6.8 million for the three and six months ended June 30, 2015, respectively, and related tax effects.

Business Combination Disclosure [Text Block]

The recognized amounts of identifiable assets acquired and liabilities assumed are as follows:

	June 30, 2015
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,349
Investments in restricted stock	7,015
Loans	1,447,135
Premises and equipment	1,931
Other assets acquired through foreclosure	1,550
Bank owned life insurance	17,385
Investment in LIHTC	5,648
Intangible assets	14,997
Deferred tax assets, net	14,261
Other assets	19,656
Total assets	$	1,969,893
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	8,633
Total liabilities	1,761,951
Net assets acquired	$	207,942
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	259,627

Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures

The following table summarizes the operating results of the discontinued operations for the three and six months ended June 30, 2014: 

	Three Months Ended June 30, 2014			Six Months Ended June 30, 2014
	(in thousands)
Operating revenue	$	(214	)	$	(358	)
Non-interest expenses	(511		)	(1,369		)
Loss before income taxes	(725		)	(1,727		)
Income tax benefit	(221		)	(569		)
Net loss	$	(504	)	$	(1,158	)

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Loans, Leases and Allowance for Credit Losses - Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 10,295,162	$ 8,366,782
Total Past Due	26,059	31,483
Total	10,321,221	8,398,265
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,018,462	1,730,164
Total Past Due	818	2,724
Total	2,019,280	1,732,888
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,000,579	1,855,454
Total Past Due	3,807	14,487
Total	2,004,386	1,869,941
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	190,207	182,180
Total Past Due	425	445
Total	190,632	182,625
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,566,978	3,324,132
Total Past Due	9,325	2,576
Total	4,576,303	3,326,708
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	183,378	205,639
Total Past Due	0	0
Total	183,378	205,639
Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	597,059	388,399
Total Past Due	0	0
Total	597,059	388,399
Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	404,356	356,209
Total Past Due	1,283	3,445
Total	405,639	359,654
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	310,628	292,065
Total Past Due	9,963	7,337
Total	320,591	299,402
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	23,515	32,540
Total Past Due	438	469
Total	23,953	33,009
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,398	7,842
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	343	1,406
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	181	2,389
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,692	1,523
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	169	2,347
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	13	177
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,609	6,867
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	180
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	3,361
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	445
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,239	15
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	2,640
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	151	205
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	219	21
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	22,052	16,774
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	475	1,138
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,626	8,737
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	425	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,394	1,038
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,283	805
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	9,643	4,785
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 206	$ 271

XML

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($)		Jun. 30, 2015		Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		$ 1,453,820,000		$ 1,493,648,000
Securities available-for-sale, Gross Unrealized Gains		35,828,000		40,480,000
Securities available-for-sale, Gross Unrealized (Losses)		(11,414,000)		(13,891,000)
Securities available for sale Total, Estimated Fair Value		1,478,234,000		1,520,237,000
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		24,906,000		18,701,000
Securities available-for-sale, Gross Unrealized Gains		0		0
Securities available-for-sale, Gross Unrealized (Losses)		(297,000)		(355,000)
Securities available for sale Total, Estimated Fair Value		24,609,000		18,346,000
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		3,891,000
Securities available-for-sale, Gross Unrealized Gains		0
Securities available-for-sale, Gross Unrealized (Losses)		0
Securities available for sale Total, Estimated Fair Value		3,891,000
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		13,097,000		52,773,000
Securities available-for-sale, Gross Unrealized Gains		568,000		717,000
Securities available-for-sale, Gross Unrealized (Losses)		0		(1,001,000)
Securities available for sale Total, Estimated Fair Value		13,665,000		52,489,000
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		281,895,000		285,398,000
Securities available-for-sale, Gross Unrealized Gains		10,889,000		13,688,000
Securities available-for-sale, Gross Unrealized (Losses)		(371,000)		(49,000)
Securities available for sale Total, Estimated Fair Value		292,413,000		299,037,000
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		82,888,000		83,192,000
Securities available-for-sale, Gross Unrealized Gains		1,935,000		2,099,000
Securities available-for-sale, Gross Unrealized (Losses)		(1,772,000)		(2,679,000)
Securities available for sale Total, Estimated Fair Value		83,051,000		82,612,000
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost				37,449,000
Securities available-for-sale, Gross Unrealized Gains				500,000
Securities available-for-sale, Gross Unrealized (Losses)				(247,000)
Securities available for sale Total, Estimated Fair Value				37,702,000
Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		861,681,000		881,734,000
Securities available-for-sale, Gross Unrealized Gains		11,297,000		11,440,000
Securities available-for-sale, Gross Unrealized (Losses)		(1,621,000)		(1,985,000)
Securities available for sale Total, Estimated Fair Value		871,357,000		891,189,000
Securities measured at fair value		1,701,000		1,858,000
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		13,145,000		2,047,000
Securities available-for-sale, Gross Unrealized Gains		64,000		100,000
Securities available-for-sale, Gross Unrealized (Losses)		0		0
Securities available for sale Total, Estimated Fair Value		13,209,000		2,147,000
Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		102,760,000		70,985,000
Securities available-for-sale, Gross Unrealized Gains		250,000		379,000
Securities available-for-sale, Gross Unrealized (Losses)		(939,000)		(1,121,000)
Securities available for sale Total, Estimated Fair Value		102,071,000		70,243,000
Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		4,908,000		5,017,000
Securities available-for-sale, Gross Unrealized Gains		71,000		132,000
Securities available-for-sale, Gross Unrealized (Losses)		0		0
Securities available for sale Total, Estimated Fair Value		4,979,000		5,149,000
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		32,000,000		32,000,000
Securities available-for-sale, Gross Unrealized Gains		0		0
Securities available-for-sale, Gross Unrealized (Losses)		(6,352,000)		(6,454,000)
Securities available for sale Total, Estimated Fair Value		25,648,000		25,546,000
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		32,599,000		24,302,000
Securities available-for-sale, Gross Unrealized Gains		0		30,000
Securities available-for-sale, Gross Unrealized (Losses)		(62,000)		0
Securities available for sale Total, Estimated Fair Value		32,537,000		24,332,000
Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Amortized Cost		50,000		50,000
Securities available-for-sale, Gross Unrealized Gains		10,754,000		11,395,000
Securities available-for-sale, Gross Unrealized (Losses)		0		0
Securities available for sale Total, Estimated Fair Value		10,804,000		11,445,000
AAA [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		85,119,000	[1]	73,261,000	[2]
AAA [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
AAA [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
AAA [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		9,284,000		8,168,000
AAA [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
AAA [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		70,856,000		59,944,000
AAA [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		4,979,000		5,149,000
AAA [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AAA [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Split-rated AAA/AA Plus [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		913,066,000	[1]	911,682,000	[2]
Split-rated AAA/AA Plus [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		24,609,000		18,346,000
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		3,891,000
Split-rated AAA/AA Plus [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
Split-rated AAA/AA Plus [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
Split-rated AAA/AA Plus [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		871,357,000		891,189,000
Securities measured at fair value		1,701,000		1,858,000
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		13,209,000		2,147,000
Split-rated AAA/AA Plus [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Split-rated AAA/AA Plus [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
AA Plus to AA- [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		148,635,000	[1]	141,083,000	[2]
AA Plus to AA- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
AA Plus to AA- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		2,748,000
AA Plus to AA- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		145,706,000		138,256,000
AA Plus to AA- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
AA Plus to AA- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		181,000		68,000
AA Plus to AA- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
AA Plus to AA- [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				2,759,000
A Plus to A- [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		153,080,000	[1]	155,164,000	[2]
A Plus to A- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
A Plus to A- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		10,591,000
A Plus to A- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		131,055,000		146,155,000
A Plus to A- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
A Plus to A- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		11,434,000		3,439,000
A Plus to A- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
A Plus to A- [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				5,570,000
BBB Plus to BBB- [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		103,023,000	[1]	171,851,000	[2]
BBB Plus to BBB- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BBB Plus to BBB- [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BBB Plus to BBB- [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		6,183,000		6,263,000
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		55,223,000		54,585,000
BBB Plus to BBB- [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			37,702,000
BBB Plus to BBB- [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		15,969,000		3,595,000
BBB Plus to BBB- [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		25,648,000		25,546,000
BBB Plus to BBB- [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BBB Plus to BBB- [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				44,160,000
BB Plus and below [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		32,539,000	[1]	32,469,000	[2]
BB Plus and below [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BB Plus and below [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
BB Plus and below [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		185,000		195,000
BB Plus and below [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		18,062,000		17,632,000
BB Plus and below [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
BB Plus and below [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		3,488,000		3,197,000
BB Plus and below [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
BB Plus and below [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		10,804,000		11,445,000
BB Plus and below [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Corporate Credit Quality Indicator Unrated [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		42,772,000	[1]	34,727,000	[2]
Corporate Credit Quality Indicator Unrated [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		326,000
Corporate Credit Quality Indicator Unrated [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		9,766,000		10,395,000
Corporate Credit Quality Indicator Unrated [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			0
Corporate Credit Quality Indicator Unrated [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Securities measured at fair value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		143,000		0
Corporate Credit Quality Indicator Unrated [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		32,537,000		24,332,000
Corporate Credit Quality Indicator Unrated [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		0		0
Corporate Credit Quality Indicator Unrated [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				0
Rated Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		1,478,234,000	[1]	1,520,237,000	[2]
Rated Securities [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		24,609,000		18,346,000
Rated Securities [Member] | US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		3,891,000
Rated Securities [Member] | Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		13,665,000
Rated Securities [Member] | Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		292,413,000		299,037,000
Rated Securities [Member] | Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		83,051,000		82,612,000
Rated Securities [Member] | Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value	[3]			37,702,000
Rated Securities [Member] | Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		871,357,000		891,189,000
Securities measured at fair value		1,701,000		1,858,000
Rated Securities [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		13,209,000		2,147,000
Rated Securities [Member] | Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		102,071,000		70,243,000
Rated Securities [Member] | Private label commercial mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		4,979,000		5,149,000
Rated Securities [Member] | Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		25,648,000		25,546,000
Rated Securities [Member] | CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		32,537,000		24,332,000
Rated Securities [Member] | Collateralized debt obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value		$ 10,804,000		11,445,000
Rated Securities [Member] | Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale Total, Estimated Fair Value				$ 52,489,000

[1] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ

[2] The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

[3] At least 80% of mutual funds are investment grade corporate debt securities.

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Stockholders' Equity - Additional Information (Detail) - USD ($)		3 Months Ended			6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares, Issued	102,290,865	102,290,865			102,290,865		88,691,249
Stock Issued During Period, Value, New Issues					$ 431,031,000	$ 2,611,000
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Offering Cost from Issuance of Common Stock						$ 200,000
Stock Issued During Period, Shares, New Issues					0	115,866
Weighted Average Selling Price Per Share						$ 24.44
Stock Issued During Period, Value, New Issues					$ 1,000	$ 2,831,306.000
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period			285,000
Allocated Share-based Compensation Expense		$ 1,000,000		$ 700,000	$ 2,000,000	1,500,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period		44,975			335,975
Allocated Share-based Compensation Expense		$ 2,600,000		$ 1,900,000	$ 5,100,000	$ 3,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,490,676.000000	1,490,676.000000			1,490,676.000000		1,100,000.0
Director [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period					64,000
Bridge Capital Holdings [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business Acquisition Share Exchange Ratio	0.8145
Business Acquisition Cash Consideration Per Share	$ 2.39
Equity Award Conversion Ratio	0.905
Business Combination, Consideration Transferred, Liabilities Incurred	$ 10,676,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 2,300,000	$ 2,300,000			$ 2,300,000
Common Stock, Shares, Issued	12,451,240	12,451,240			12,451,240
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid	213,091
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 420,354,000
Payments to Acquire Businesses, Gross	$ 36,539,000
Bridge Capital Holdings [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, New Issues					12,997,000
Bridge Capital Holdings [Member] | Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate	0.00%
Business Combination, Consideration Transferred, Liabilities Incurred	$ 1,713,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	$ 4,100,000	$ 4,100,000			$ 4,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate	33.96%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	2.11%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term	7 years 7 months 28 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 19.06
Bridge Capital Holdings [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 8,963,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options	17,000,000	17,000,000			17,000,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options	$ 8,000,000	$ 8,000,000			$ 8,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	546,151

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Segments - Operating Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Operating Statistics [Line Items]
Assets	$ 13,470,104	$ 10,023,600	$ 13,470,104	$ 10,023,600	$ 10,600,498
Cash, Cash Equivalents and Investment Securities	2,290,200	1,986,000	2,290,200	1,986,000	1,712,200
Loans, net of deferred loan fees and costs	10,321,221	7,544,500	10,321,221	7,544,500	8,398,265
Loans, net of deferred loan fees and costs	10,360,623		10,360,623
Less: Allowance for credit losses	(115,056)	(105,900)	(115,056)	(105,900)	(110,216)
Loans, net	10,206,165	7,438,600	10,206,165	7,438,600	8,288,049
Total loans held for investment	10,245,500		10,245,500
Intangible Assets, Net (Including Goodwill)	300,000	26,500	300,000	26,500	25,900
Other Assets Segment	575,100	513,200	575,100	513,200	517,200
Deposits	11,406,728	8,469,500	11,406,728	8,469,500	8,931,043
Other borrowings	69,429	337,500	69,429	337,500	390,263
Stockholders' equity	1,514,744	957,664	1,514,744	957,664	1,000,928	$ 855,498
Net interest income	108,718	93,898	211,826	184,675
Provision for Loan, Lease, and Other Losses	0	507	700	4,007
Net interest income (loss) after provision for credit losses	108,718	93,391	211,126	180,668
Non-interest income	(2,191)	5,599	3,742	10,154
Non-interest expense	(61,209)	(52,242)	(115,242)	(101,711)
Income from continuing operations before income taxes	45,318	46,748	99,626	89,111
Income tax expense (benefit)	10,599	10,706	24,717	21,330
Income from continuing operations	34,719	36,042	74,909	67,781
Loss from discontinued operations, net	0	(504)	0	(1,158)
Net income (loss)	34,719	35,538	74,909	66,623
Other Repossessed Assets	59,300	59,300	59,300	59,300	57,100
Other Liabilities Segment	270,900	258,900	270,900	258,900	278,300
Liabilities	11,955,360	9,065,900	11,955,360	9,065,900	9,599,570
Liabilities and Equity	13,470,104	10,023,600	13,470,104	10,023,600	10,600,498
Excess Funds Provided (Used) Segment Basis	0	0	0	0	0
Other borrowings	277,800		277,800
Reportable Geographical Components [Member] | ARIZONA
Operating Statistics [Line Items]
Assets	2,466,100	2,159,400	2,466,100	2,159,400	2,363,800
Cash, Cash Equivalents and Investment Securities	2,300	3,000	2,300	3,000	2,300
Loans, net of deferred loan fees and costs		2,131,000		2,131,000	2,341,900
Loans, net of deferred loan fees and costs	2,432,800		2,432,800
Less: Allowance for credit losses	(31,400)	(29,900)	(31,400)	(29,900)	(30,700)
Loans, net		2,101,100		2,101,100	2,311,200
Total loans held for investment	2,401,400		2,401,400
Intangible Assets, Net (Including Goodwill)	0	0	0	0	0
Other Assets Segment	43,800	42,200	43,800	42,200	34,800
Deposits	2,369,900	2,115,400	2,369,900	2,115,400	2,178,000
Other borrowings		0		0	0
Stockholders' equity	267,600	233,700	267,600	233,700	250,800
Net interest income	32,091	29,211	61,076	55,819
Provision for Loan, Lease, and Other Losses	826	3	158	1,561
Net interest income (loss) after provision for credit losses	31,265	29,208	60,918	54,258
Non-interest income	1,008	934	1,947	1,710
Non-interest expense	(14,507)	(12,793)	(29,268)	(26,053)
Income from continuing operations before income taxes	17,766	17,349	33,597	29,915
Income tax expense (benefit)	6,970	6,805	13,180	11,734
Income from continuing operations		10,544		18,181
Loss from discontinued operations, net		0		0
Net income (loss)	10,796	10,544	20,417	18,181
Other Repossessed Assets	18,600	13,100	18,600	13,100	15,500
Other Liabilities Segment	20,300	20,900	20,300	20,900	17,400
Liabilities	2,390,200	2,136,300	2,390,200	2,136,300	2,195,400
Liabilities and Equity	2,657,800	2,370,000	2,657,800	2,370,000	2,446,200
Excess Funds Provided (Used) Segment Basis	191,700	210,600	191,700	210,600	82,400
Other borrowings	0		0
Reportable Geographical Components [Member] | NEVADA
Operating Statistics [Line Items]
Assets	1,861,100	1,779,300	1,861,100	1,779,300	1,762,900
Cash, Cash Equivalents and Investment Securities	10,200	7,000	10,200	7,000	5,000
Loans, net of deferred loan fees and costs		1,682,600		1,682,600	1,668,700
Loans, net of deferred loan fees and costs	1,761,900		1,761,900
Less: Allowance for credit losses	(22,800)	(23,600)	(22,800)	(23,600)	(21,900)
Loans, net		1,659,000		1,659,000	1,646,800
Total loans held for investment	1,739,100		1,739,100
Intangible Assets, Net (Including Goodwill)	25,400	26,500	25,400	26,500	25,900
Other Assets Segment	63,000	62,700	63,000	62,700	64,200
Deposits	3,316,900	3,187,800	3,316,900	3,187,800	3,230,600
Other borrowings		0		0	0
Stockholders' equity	244,900	212,500	244,900	212,500	209,000
Net interest income	29,946	29,359	59,155	57,954
Provision for Loan, Lease, and Other Losses	(3,148)	(2,011)	(2,799)	(2,895)
Net interest income (loss) after provision for credit losses	33,094	31,370	61,954	60,849
Non-interest income	2,370	2,248	4,653	4,384
Non-interest expense	(14,918)	(15,922)	(29,392)	(31,005)
Income from continuing operations before income taxes	20,546	17,696	37,215	34,228
Income tax expense (benefit)	7,191	6,194	13,025	11,981
Income from continuing operations		11,502		22,247
Loss from discontinued operations, net		0		0
Net income (loss)	13,355	11,502	24,190	22,247
Other Repossessed Assets	23,400	24,100	23,400	24,100	21,000
Other Liabilities Segment	29,200	46,800	29,200	46,800	40,800
Liabilities	3,346,100	3,234,600	3,346,100	3,234,600	3,271,400
Liabilities and Equity	3,591,000	3,447,100	3,591,000	3,447,100	3,480,400
Excess Funds Provided (Used) Segment Basis	1,729,900	1,667,800	1,729,900	1,667,800	1,717,500
Other borrowings	0		0
Reportable Geographical Components [Member] | CALIFORNIA
Operating Statistics [Line Items]
Assets	1,654,800	1,509,600	1,654,800	1,509,600	1,543,600
Cash, Cash Equivalents and Investment Securities	2,600	2,200	2,600	2,200	2,200
Loans, net of deferred loan fees and costs		1,515,300		1,515,300	1,553,100
Loans, net of deferred loan fees and costs	1,659,900		1,659,900
Less: Allowance for credit losses	(21,400)	(18,700)	(21,400)	(18,700)	(17,900)
Loans, net		1,496,600		1,496,600	1,535,200
Total loans held for investment	1,638,500		1,638,500
Intangible Assets, Net (Including Goodwill)	0	0	0	0	0
Other Assets Segment	13,700	10,800	13,700	10,800	6,200
Deposits	1,946,800	1,666,200	1,946,800	1,666,200	1,744,500
Other borrowings		0		0	0
Stockholders' equity	182,100	83,100	182,100	83,100	70,900
Net interest income	24,070	22,502	46,560	43,181
Provision for Loan, Lease, and Other Losses	634	(1,672)	266	(1,017)
Net interest income (loss) after provision for credit losses	23,436	24,174	46,294	44,198
Non-interest income	850	865	1,515	2,015
Non-interest expense	(11,777)	(12,410)	(23,398)	(24,358)
Income from continuing operations before income taxes	12,509	12,629	24,411	21,855
Income tax expense (benefit)	5,261	5,310	10,265	9,190
Income from continuing operations		7,319		12,665
Loss from discontinued operations, net		0		0
Net income (loss)	7,248	7,319	14,146	12,665
Other Repossessed Assets	0	0	0	0	0
Other Liabilities Segment	3,500	4,700	3,500	4,700	8,900
Liabilities	1,950,300	1,670,900	1,950,300	1,670,900	1,753,400
Liabilities and Equity	2,132,400	1,754,000	2,132,400	1,754,000	1,824,300
Excess Funds Provided (Used) Segment Basis	477,600	244,400	477,600	244,400	280,700
Other borrowings	0		0
Reportable Geographical Components [Member] | Northern California [Member]
Operating Statistics [Line Items]
Assets		190,000		190,000	209,100
Cash, Cash Equivalents and Investment Securities		200		200	300
Loans, net of deferred loan fees and costs		179,500		179,500	198,600
Less: Allowance for credit losses		(5,100)		(5,100)	(5,100)
Loans, net		174,400		174,400	193,500
Intangible Assets, Net (Including Goodwill)		0		0	0
Other Assets Segment		15,400		15,400	15,300
Deposits		394,900		394,900	584,000
Other borrowings		0		0	0
Stockholders' equity		105,600		105,600	126,800
Net interest income	5,216	2,200	9,669	4,313
Provision for Loan, Lease, and Other Losses	513	0	486	0
Net interest income (loss) after provision for credit losses	4,703	2,200	9,183	4,313
Non-interest income	271	34	322	65
Non-interest expense	(2,142)	(861)	(4,159)	(1,887)
Income from continuing operations before income taxes	2,832	1,373	5,346	2,491
Income tax expense (benefit)	1,191	577	2,248	1,047
Income from continuing operations		796		1,444
Loss from discontinued operations, net		0		0
Net income (loss)	1,641	796	3,098	1,444
Other Repossessed Assets		0		0	0
Other Liabilities Segment		100		100	200
Liabilities		395,000		395,000	584,200
Liabilities and Equity		500,600		500,600	711,000
Excess Funds Provided (Used) Segment Basis		310,600		310,600	501,900
Operating Segments [Member] | Central Business Lines
Operating Statistics [Line Items]
Assets	3,500,800	1,945,200	3,500,800	1,945,200	2,578,900
Cash, Cash Equivalents and Investment Securities	0	0	0	0	0
Loans, net of deferred loan fees and costs		1,951,500		1,951,500	2,590,000
Loans, net of deferred loan fees and costs	3,388,000		3,388,000
Less: Allowance for credit losses	(35,700)	(27,400)	(35,700)	(27,400)	(34,000)
Loans, net		1,924,100		1,924,100	2,556,000
Total loans held for investment	3,352,300		3,352,300
Intangible Assets, Net (Including Goodwill)	119,400	0	119,400	0	0
Other Assets Segment	29,100	21,100	29,100	21,100	22,900
Deposits	1,945,100	886,300	1,945,100	886,300	946,600
Other borrowings		0		0	0
Stockholders' equity	409,800	152,300	409,800	152,300	232,900
Net interest income	24,432	16,226	47,742	30,190
Provision for Loan, Lease, and Other Losses	1,251	3,467	2,660	5,637
Net interest income (loss) after provision for credit losses	23,181	12,759	45,082	24,553
Non-interest income	321	643	1,037	725
Non-interest expense	(9,548)	(6,640)	(18,826)	(13,148)
Income from continuing operations before income taxes	13,954	6,762	27,293	12,130
Income tax expense (benefit)	5,233	2,536	10,235	4,549
Income from continuing operations		4,226		7,581
Loss from discontinued operations, net		0		0
Net income (loss)	8,721	4,226	17,058	7,581
Other Repossessed Assets	0	0	0	0	0
Other Liabilities Segment	77,600	24,700	77,600	24,700	72,400
Liabilities	2,022,700	911,000	2,022,700	911,000	1,019,000
Liabilities and Equity	2,432,500	1,063,300	2,432,500	1,063,300	1,251,900
Excess Funds Provided (Used) Segment Basis	(1,068,300)	(881,900)	(1,068,300)	(881,900)	(1,327,000)
Other borrowings	0		0
Operating Segments [Member] | Northern California [Member]
Operating Statistics [Line Items]
Assets	1,248,900		1,248,900
Cash, Cash Equivalents and Investment Securities	2,100		2,100
Loans, net of deferred loan fees and costs	1,077,500		1,077,500
Less: Allowance for credit losses	(3,200)		(3,200)
Total loans held for investment	1,074,300		1,074,300
Intangible Assets, Net (Including Goodwill)	155,200		155,200
Other Assets Segment	15,700		15,700
Deposits	1,550,200		1,550,200
Stockholders' equity	281,500		281,500
Other Repossessed Assets	1,600		1,600
Other Liabilities Segment	8,400		8,400
Liabilities	1,558,600		1,558,600
Liabilities and Equity	1,840,100		1,840,100
Excess Funds Provided (Used) Segment Basis	591,200		591,200
Other borrowings	0		0
Corporate & Other
Operating Statistics [Line Items]
Assets	2,738,400	2,440,100	2,738,400	2,440,100	2,142,200
Cash, Cash Equivalents and Investment Securities	2,273,000	1,973,600	2,273,000	1,973,600	1,702,400
Loans, net of deferred loan fees and costs		84,600		84,600	46,000
Loans, net of deferred loan fees and costs	40,500		40,500
Less: Allowance for credit losses	(600)	(1,200)	(600)	(1,200)	(600)
Loans, net		83,400		83,400	45,400
Total loans held for investment	39,900		39,900
Intangible Assets, Net (Including Goodwill)	0	0	0	0	0
Other Assets Segment	409,800	361,000	409,800	361,000	373,800
Deposits	277,800	218,900	277,800	218,900	247,300
Other borrowings		337,500		337,500	390,300
Stockholders' equity	128,800	170,500	128,800	170,500	110,500
Net interest income	(7,037)	(5,600)	(12,376)	(6,782)
Provision for Loan, Lease, and Other Losses	(76)	720	(71)	721
Net interest income (loss) after provision for credit losses	(6,961)	(6,320)	(12,305)	(7,503)
Non-interest income	(7,011)	875	(5,732)	1,255
Non-interest expense	(8,317)	(3,616)	(10,199)	(5,260)
Income from continuing operations before income taxes	(22,289)	(9,061)	(28,236)	(11,508)
Income tax expense (benefit)	(15,247)	(10,716)	(24,236)	(17,171)
Income from continuing operations		1,655		5,663
Loss from discontinued operations, net		(504)		(1,158)
Net income (loss)	(7,042)	1,151	(4,000)	4,505
Other Repossessed Assets	15,700	22,100	15,700	22,100	20,600
Other Liabilities Segment	131,900	161,700	131,900	161,700	138,600
Liabilities	687,500	718,100	687,500	718,100	776,200
Liabilities and Equity	816,300	888,600	816,300	888,600	886,700
Excess Funds Provided (Used) Segment Basis	(1,922,100)	$ (1,551,500)	(1,922,100)	$ (1,551,500)	$ (1,255,500)
Other borrowings	$ 277,800		$ 277,800

XML

Segments (Tables)

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Operating Segment Information

The following is a summary of selected operating segment information as of June 30, 2015, December 31, 2014, and June 30, 2014 and for the three and six months ended June 30, 2015 and 2014.

	Arizona			Nevada			Southern California			Northern California (1)			Central Business Lines (1)			Corporate & Other (1)			Consolidated Company
At June 30, 2015	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	10.2		$	2.6		$	2.1		$	—		$	2,273.0		$	2,290.2
Loans, net of deferred loan fees and costs	2,432.8			1,761.9			1,659.9			1,077.5			3,388.0			40.5			10,360.6
Less: allowance for credit losses	(31.4		)	(22.8		)	(21.4		)	(3.2		)	(35.7		)	(0.6		)	(115.1		)
Total loans	2,401.4			1,739.1			1,638.5			1,074.3			3,352.3			39.9			10,245.5
Other assets acquired through foreclosure, net	18.6			23.4			—			1.6			—			15.7			59.3
Goodwill and other intangible assets, net	—			25.4			—			155.2			119.4			—			300.0
Other assets	43.8			63.0			13.7			15.7			29.1			409.8			575.1
Total assets	$	2,466.1		$	1,861.1		$	1,654.8		$	1,248.9		$	3,500.8		$	2,738.4		$	13,470.1
Liabilities:
Deposits	$	2,369.9		$	3,316.9		$	1,946.8		$	1,550.2		$	1,945.1		$	277.8		$	11,406.7
Borrowings and qualifying debt	—			—			—			—			—			277.8			277.8
Other liabilities	20.3			29.2			3.5			8.4			77.6			131.9			270.9
Total liabilities	2,390.2			3,346.1			1,950.3			1,558.6			2,022.7			687.5			11,955.4
Allocated equity:	267.6			244.9			182.1			281.5			409.8			128.8			1,514.7
Total liabilities and stockholders' equity	$	2,657.8		$	3,591.0		$	2,132.4		$	1,840.1		$	2,432.5		$	816.3		$	13,470.1
Excess funds provided (used)	191.7			1,729.9			477.6			591.2			(1,068.3		)	(1,922.1		)	—

(1)    Includes Bridge balances.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	5.0		$	2.2		$	0.3		$	—		$	1,702.4		$	1,712.2
Loans, net of deferred loan fees and costs	2,341.9			1,668.7			1,553.1			198.6			2,590.0			46.0			8,398.3
Less: allowance for credit losses	(30.7		)	(21.9		)	(17.9		)	(5.1		)	(34.0		)	(0.6		)	(110.2		)
Total loans	2,311.2			1,646.8			1,535.2			193.5			2,556.0			45.4			8,288.1
Other assets acquired through foreclosure, net	15.5			21.0			—			—			—			20.6			57.1
Goodwill and other intangible assets, net	—			25.9			—			—			—			—			25.9
Other assets	34.8			64.2			6.2			15.3			22.9			373.8			517.2
Total assets	$	2,363.8		$	1,762.9		$	1,543.6		$	209.1		$	2,578.9		$	2,142.2		$	10,600.5
Liabilities:
Deposits	$	2,178.0		$	3,230.6		$	1,744.5		$	584.0		$	946.6		$	247.3		$	8,931.0
Other borrowings	—			—			—			—			—			390.3			390.3
Other liabilities	17.4			40.8			8.9			0.2			72.4			138.6			278.3
Total liabilities	2,195.4			3,271.4			1,753.4			584.2			1,019.0			776.2			9,599.6
Allocated equity:	250.8			209.0			70.9			126.8			232.9			110.5			1,000.9
Total liabilities and stockholders' equity	$	2,446.2		$	3,480.4		$	1,824.3		$	711.0		$	1,251.9		$	886.7		$	10,600.5
Excess funds provided (used)	82.4			1,717.5			280.7			501.9			(1,327.0		)	(1,255.5		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At June 30, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	3.0		$	7.0		$	2.2		$	0.2		$	—		$	1,973.6		$	1,986.0
Loans, net of deferred loan fees and costs	2,131.0			1,682.6			1,515.3			179.5			1,951.5			84.6			7,544.5
Less: allowance for credit losses	(29.9		)	(23.6		)	(18.7		)	(5.1		)	(27.4		)	(1.2		)	(105.9		)
Total loans	2,101.1			1,659.0			1,496.6			174.4			1,924.1			83.4			7,438.6
Other assets acquired through foreclosure, net	13.1			24.1			—			—			—			22.1			59.3
Goodwill and other intangible assets, net	—			26.5			—			—			—			—			26.5
Other assets	42.2			62.7			10.8			15.4			21.1			361.0			513.2
Total assets	$	2,159.4		$	1,779.3		$	1,509.6		$	190.0		$	1,945.2		$	2,440.1		$	10,023.6
Liabilities:
Deposits	$	2,115.4		$	3,187.8		$	1,666.2		$	394.9		$	886.3		$	218.9		$	8,469.5
Other borrowings	—			—			—			—			—			337.5			337.5
Other liabilities	20.9			46.8			4.7			0.1			24.7			161.7			258.9
Total liabilities	2,136.3			3,234.6			1,670.9			395.0			911.0			718.1			9,065.9
Allocated equity:	233.7			212.5			83.1			105.6			152.3			170.5			957.7
Total liabilities and stockholders' equity	$	2,370.0		$	3,447.1		$	1,754.0		$	500.6		$	1,063.3		$	888.6		$	10,023.6
Excess funds provided (used)	210.6			1,667.8			244.4			310.6			(881.9		)	(1,551.5		)	—

	Arizona			Nevada			Southern California			Northern California (2)			Central Business Lines (2)			Corporate & Other (2)			Consolidated Company
Three Months Ended June 30, 2015:	(in thousands)
Net interest income (expense)	$	32,091		$	29,946		$	24,070		$	5,216		$	24,432		$	(7,037	)	$	108,718
Provision for (recovery of) credit losses	826			(3,148		)	634			513			1,251			(76		)	—
Net interest income (expense) after provision for credit losses	31,265			33,094			23,436			4,703			23,181			(6,961		)	108,718
Non-interest income	1,008			2,370			850			271			321			(7,011		)	(2,191		)
Non-interest expense	(14,507		)	(14,918		)	(11,777		)	(2,142		)	(9,548		)	(8,317		)	(61,209		)
Income (loss) from continuing operations before income taxes	17,766			20,546			12,509			2,832			13,954			(22,289		)	45,318
Income tax expense (benefit)	6,970			7,191			5,261			1,191			5,233			(15,247		)	10,599
Net income	$	10,796		$	13,355		$	7,248		$	1,641		$	8,721		$	(7,042	)	$	34,719

(2)    Excludes legacy Bridge operations; Northern California includes two legacy TPB branches.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Three Months Ended June 30, 2014:	(in thousands)
Net interest income (expense)	$	29,211		$	29,359		$	22,502		$	2,200		$	16,226		$	(5,600	)	$	93,898
Provision for credit losses	3			(2,011		)	(1,672		)	—			3,467			720			507
Net interest income (expense) after provision for credit losses	29,208			31,370			24,174			2,200			12,759			(6,320		)	93,391
Non-interest income	934			2,248			865			34			643			875			5,599
Non-interest expense	(12,793		)	(15,922		)	(12,410		)	(861		)	(6,640		)	(3,616		)	(52,242		)
Income (loss) from continuing operations before income taxes	17,349			17,696			12,629			1,373			6,762			(9,061		)	46,748
Income tax expense (benefit)	6,805			6,194			5,310			577			2,536			(10,716		)	10,706
Income from continuing operations	10,544			11,502			7,319			796			4,226			1,655			36,042
Loss from discontinued operations, net	—			—			—			—			—			(504		)	(504		)
Net income	$	10,544		$	11,502		$	7,319		$	796		$	4,226		$	1,151		$	35,538

	Arizona			Nevada			Southern California			Northern California (2)			Central Business Lines (2)			Corporate & Other (2)			Consolidated Company
Six Months Ended June 30, 2015:	(in thousands)
Net interest income (expense)	$	61,076		$	59,155		$	46,560		$	9,669		$	47,742		$	(12,376	)	$	211,826
Provision for (recovery of) credit losses	158			(2,799		)	266			486			2,660			(71		)	700
Net interest income (expense) after provision for credit losses	60,918			61,954			46,294			9,183			45,082			(12,305		)	211,126
Non-interest income	1,947			4,653			1,515			322			1,037			(5,732		)	3,742
Non-interest expense	(29,268		)	(29,392		)	(23,398		)	(4,159		)	(18,826		)	(10,199		)	(115,242		)
Income (loss) from continuing operations before income taxes	33,597			37,215			24,411			5,346			27,293			(28,236		)	99,626
Income tax expense (benefit)	13,180			13,025			10,265			2,248			10,235			(24,236		)	24,717
Net income	$	20,417		$	24,190		$	14,146		$	3,098		$	17,058		$	(4,000	)	$	74,909

(2)    Excludes legacy Bridge operations; Northern California includes two legacy TPB branches.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other (1)			Consolidated Company
Six Months Ended June 30, 2014:	(in thousands)
Net interest income (expense)	$	55,819		$	57,954		$	43,181		$	4,313		$	30,190		$	(6,782	)	$	184,675
Provision for credit losses	1,561			(2,895		)	(1,017		)	—			5,637			721			4,007
Net interest income (expense) after provision for credit losses	54,258			60,849			44,198			4,313			24,553			(7,503		)	180,668
Non-interest income	1,710			4,384			2,015			65			725			1,255			10,154
Non-interest expense	(26,053		)	(31,005		)	(24,358		)	(1,887		)	(13,148		)	(5,260		)	(101,711		)
Income (loss) from continuing operations before income taxes	29,915			34,228			21,855			2,491			12,130			(11,508		)	89,111
Income tax expense (benefit)	11,734			11,981			9,190			1,047			4,549			(17,171		)	21,330
Income from continuing operations	18,181			22,247			12,665			1,444			7,581			5,663			67,781
Loss from discontinued operations, net	—			—			—			—			—			(1,158		)	(1,158		)
Net income	$	18,181		$	22,247		$	12,665		$	1,444		$	7,581		$	4,505		$	66,623

XML

Loans, Leases and Allowance for Credit Losses - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Leases [Line Items]
Receivable with Imputed Interest, Discount		$ (8,100)		$ (8,100)		$ (7,500)
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	59,425		59,425		67,659
Impaired Financing Receivable, Average Recorded Investment		155,943	$ 167,326	159,186	$ 170,010
Aggregate carrying amount of impaired loans	[2]	106,369		106,369		124,928
Reduction in interest income due to nonaccrual loans		700	800	1,400	1,800
Loans And Loans Receivable Purchases		7,700	16,700	26,100	32,300
Financing Receivable, Significant Sales				56,300
Impaired loans with no allowance recorded	[3]	44,780		44,780		41,822
Impaired loans with an allowance recorded	[4]	7,157		7,157		10,765
Loans and Leases Receivable, Gain (Loss) on Sales, Net				300
Troubled Debt Restructured Loans [Member]
Leases [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status		42,600		42,600		53,600
Impaired Financing Receivable, Average Recorded Investment		121,200	$ 123,600	123,600	$ 126,600
Aggregate carrying amount of impaired loans		92,700		92,700		103,300
Loan commitments outstanding		0		0		1,200
Impaired loans with no allowance recorded		30,100		30,100		35,000
Impaired loans with an allowance recorded		5,600		5,600		8,900
Construction and land development [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		18,542		18,542		21,052
Impaired loans with no allowance recorded		576		576		696
Impaired loans with an allowance recorded		1,416		1,416		3,112
Commercial real estate [Member]
Leases [Line Items]
Loans And Loans Receivable Purchases				13,100
Residential real estate [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		13,477		13,477		19,300
Impaired loans with no allowance recorded		9,134		9,134		0
Impaired loans with an allowance recorded		717		717		1,052
Commercial and industrial [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		11,805		11,805		11,399
Loans And Loans Receivable Purchases				13,000
Impaired loans with no allowance recorded		2		2		2,350
Impaired loans with an allowance recorded		1,685		1,685		1,926
Consumer [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans		126		126		175
Impaired loans with no allowance recorded		197		197		188
Impaired loans with an allowance recorded		$ 4		$ 4		$ 17

[1] Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

[3] Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

[4] Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

XML

Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure (Detail) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2015 USD ($) Property		Jun. 30, 2014 USD ($)		Jun. 30, 2015 USD ($) Property	Jun. 30, 2014 USD ($)	Dec. 31, 2014 Property
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Other Assets Acquired through Foreclosure Additions Due to Business Acquisition	$ 1,550				$ 1,550
Gains Losses On Transfers To Other Real Estate And Foreclosed Assets	$ 0				$ 600	$ 0
Number of Real Estate Properties | Property	56				56		67
Balance, beginning of the period, Gross Balance	$ 77,968		$ 72,226		$ 71,421	88,421
Transfers to other assets acquired through foreclosure, net, Gross Balance	5,739		4,309		13,459	6,419
Proceeds from sale of other real estate owned and repossessed assets, net, Gross Balance	(15,415)		(1,903)		(17,703)	(21,376)
Gains (losses), net, Gross Balance	1,940	[1]	11	[1]	3,055	1,179
Balance, end of period, Gross Balance	71,782		74,643		71,782	74,643
Balance, beginning of the period, Valuation Allowance	(14,209)		(15,776)		(14,271)	(21,702)
Proceeds from sale of other real estate owned and repossessed assets, net, Valuation Allowance	2,480		683		3,328	6,644
Valuation adjustments, net, Valuation Allowance	718		(258)		(1,504)	(293)
Balance, end of period, Valuation Allowance	(12,447)		(15,351)		(12,447)	(15,351)
Balance, beginning of the period, Net Balance	63,759		56,450		57,150	66,719
Transfers to other assets acquired through foreclosure, net, Net Balance	5,739		4,309		13,459	6,419
Proceeds from sale of other real estate owned and repossessed assets, net, Net Balance	(12,935)		(1,220)		(14,375)	(14,732)
Valuation adjustments of other repossessed assets, net	(718)		(258)		(1,504)	(293)
Gains (losses), net, Net Balance	1,940	[1]	11	[1]	3,055	1,179
Balance, end of period, Net Balance	$ 59,335		$ 59,292		$ 59,335	$ 59,292

[1] Includes net gains related to initial transfers to other assets of zero during both the three months ended June 30, 2015 and 2014, pursuant to accounting guidance.

XML

Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Valuation Allowance [Line Items]
Beginning Balance	$ 112,098	$ 103,899	$ 110,216	$ 100,050
Charge-offs	(2,042)	(1,974)	(2,889)	(4,041)
Recoveries	5,000	3,505	7,029	5,921
Provision for credit losses	0	507	700	4,007
Ending balance	115,056	105,937	115,056	105,937
Construction and land development [Member]
Valuation Allowance [Line Items]
Beginning Balance	17,999	16,700	18,558	14,519
Charge-offs	0	(78)	0	(78)
Recoveries	1,373	498	1,530	709
Provision for credit losses	165	(247)	(551)	1,723
Ending balance	19,537	16,873	19,537	16,873
Commercial real estate [Member]
Valuation Allowance [Line Items]
Beginning Balance	28,111	34,853	28,783	32,064
Charge-offs	0	(330)	0	(501)
Recoveries	1,738	1,248	2,121	1,808
Provision for credit losses	(903)	(1,422)	(1,958)	978
Ending balance	28,946	34,349	28,946	34,349
Residential real estate [Member]
Valuation Allowance [Line Items]
Beginning Balance	6,666	11,297	7,456	11,640
Charge-offs	(218)	(523)	(618)	(929)
Recoveries	1,184	314	1,717	867
Provision for credit losses	(1,233)	(861)	(2,156)	(1,351)
Ending balance	6,399	10,227	6,399	10,227
Commercial and industrial [Member]
Valuation Allowance [Line Items]
Beginning Balance	58,651	39,493	54,566	39,657
Charge-offs	(1,771)	(1,038)	(2,164)	(2,516)
Recoveries	681	1,254	1,597	2,176
Provision for credit losses	2,028	3,152	5,590	3,544
Ending balance	59,589	42,861	59,589	42,861
Consumer [Member]
Valuation Allowance [Line Items]
Beginning Balance	671	1,556	853	2,170
Charge-offs	(53)	(5)	(107)	(17)
Recoveries	24	191	64	361
Provision for credit losses	(57)	(115)	(225)	(887)
Ending balance	$ 585	$ 1,627	$ 585	$ 1,627

XML

Investment Securities - Investment Securities by Credit Rating Type Parenthetical (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	$ 1,478,234	$ 1,520,237
Minimum percentage of investment grade mutual funds		80.00%
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	$ 32,537	$ 24,332

XML

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Nature of operation

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB Northern California offices are operating as a combined division under the Bridge trade name.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equipment Finance, Public Finance, Resort Finance, Technology Finance, Energy Infrastructure Group, and Mortgage Warehouse Lending. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Unaudited Consolidated Financial Statements.

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and other assets and liabilities carried at fair value; and accounting for income taxes. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the Unaudited Consolidated Financial Statements.

Principles of consolidation

As of June 30, 2015, WAL has ten wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities.

The Bank has the following wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal loans, and leases; BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; Western Alliance Equipment Finance, which offers equipment finance services nationwide. BW Nevada Holdings, LLC was dissolved on June 12, 2015 after contributing the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Certain amounts in the Consolidated Financial Statements as of December 31, 2014 and for the three and six months ended June 30, 2014 may have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

Interim financial information

The accompanying Unaudited Consolidated Financial Statements as of and for the three and six months ended June 30, 2015 and 2014 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.

The information furnished in these interim statements reflects all adjustments which are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year. The interim financial information should be read in conjunction with the Company's audited Consolidated Financial Statements.

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Investment securities

Investment securities may be classified as HTM, AFS, or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.

Securities classified as AFS or trading are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security, adjusted for prepayment estimates, using the interest method.

In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and whether it is not more likely than not the Company would be required to sell the security.

Declines in the fair value of individual AFS debt securities that are deemed to be other-than-temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) interest rate, market, or other factors is recognized in other comprehensive income or loss.

For individual debt securities where the Company either intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.

Restricted stock

On January 30, 2015, WAB became a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in capital stock of the FHLB based on the borrowing capacity used. The Company also maintains an investment in its primary correspondent bank. All of these investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. The dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. No impairment has been recorded to date.

Loans, held for investment

The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by net deferred fees and costs, and an allowance for credit losses. In addition, the book value of loans that are subject to a fair value hedge is adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk. Purchased loans are recorded at estimated fair value on the date of purchase, comprised of unpaid principal less estimated credit losses and interest rate fair value adjustments.

The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected, which are due, at least in part, to credit quality. Loans are evaluated individually to determine if there has been credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not carry over or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For additional information, see "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

For purchased loans that are not deemed impaired, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period.

When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Non-accrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.

For all loan types, when a loan is placed on non-accrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed and, the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company recognizes income on a cash basis only for those non-accrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required.

Impaired loans: A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis, if full repayment of all principal and interest is expected and the loan is both well secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are recorded as a provision for credit losses. Losses are recorded as a charge-off when losses are confirmed. In addition to management's internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations or loan impairment methodology.

Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan is also considered impaired. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months) and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. However, such loans continue to be considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) the Company's historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowance for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

The allowance consists of specific and general components. The specific allowance applies to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on the collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

Other assets acquired through foreclosure

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).

The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk are recorded in current-period earnings. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value in the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported in the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that 1) the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and 2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where 1) the host contract is measured at fair value, with changes in fair value reported in current earnings, or 2) the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried in the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered.As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit from an unrecognized tax benefit may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in other liabilities in the Consolidated Balance Sheet.

Off-balance sheet instruments

In the ordinary course of business, the Company has entered into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Financial Statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheet. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included in other liabilities and the charge to income that establishes this liability is included in non-interest expense.

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement as well as enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

• Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure. When market assumptions are available, ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at June 30, 2015 and December 31, 2014. The estimated fair value amounts for June 30, 2015 and December 31, 2014 have been measured as of period-end, and have not been reevaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 14. Fair Value Accounting" in these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.

Money market investments

The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.

Investment securities

The fair values of CRA investments, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.

The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company engages a third party to estimate the future cash flows and discount rate using third party quotes adjusted based on assumptions a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.

Restricted stock

WAB is a member of the Federal Reserve System and the FHLB and, accordingly, maintains investments in the capital stock of the FRB and the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. The fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans is categorized as Level 2 in the fair value hierarchy, excluding impaired loans which are categorized as Level 3.

Accrued interest receivable and payable

The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value.

Derivative financial instruments

All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products, or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances, other borrowings, and subordinated debt

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. Other borrowings have been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued by comparing the BB Financial over SWAP index and discounting the contractual cash flows on the Company's debt using these market rates. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Off-balance sheet instruments

The fair value of the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) is based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and the counterparties’ credit standing.

Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance should be applied on a retrospective basis. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update.

On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.6 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs are not significant.

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Loans, Leases and Allowance for Credit Losses - Summary of Impairment Method Information Related to Loans and Allowance for Credit Losses (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	[1]	$ 106,369	$ 124,928
Impaired loans with no allowance recorded	[2]	44,780	41,822
Total loans individually evaluated for impairment		151,149	166,750
Loans collectively evaluated for impairment		10,071,590	8,135,041
Impaired Financing Receivable, Recorded Investment		151,149	166,750
Total recorded investment		10,321,221	8,398,265
Impaired loans with an allowance recorded		114,015	134,791
Impaired loans with no allowance recorded		46,364	44,220
Total loans individually evaluated for impairment		160,379	179,011
Loans collectively evaluated for impairment		10,071,590	8,135,041
Total unpaid principal balance		10,367,283	8,451,849
Impaired loans with an allowance recorded	[3]	7,157	10,765
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		7,157	10,765
Loans collectively evaluated for impairment		107,862	99,188
Total loans held for investment		115,056	110,216	$ 105,900
Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		19,274	28,024
Impaired loans with no allowance recorded		15,062	16,869
Total loans individually evaluated for impairment		34,336	44,893
Loans collectively evaluated for impairment		1,967,622	1,670,083
Total recorded investment		2,019,280	1,732,888
Impaired loans with an allowance recorded		21,847	31,292
Impaired loans with no allowance recorded		15,349	17,010
Total loans individually evaluated for impairment		37,196	48,302
Loans collectively evaluated for impairment		1,967,622	1,670,083
Total unpaid principal balance		2,027,942	1,742,658
Impaired loans with an allowance recorded		1,330	2,082
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		1,330	2,082
Loans collectively evaluated for impairment		11,684	10,198
Total loans held for investment		13,014	12,454
Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		43,135	44,937
Impaired loans with no allowance recorded		15,889	21,387
Total loans individually evaluated for impairment		59,024	66,324
Loans collectively evaluated for impairment		2,068,457	1,910,420
Total recorded investment		2,195,018	2,052,566
Impaired loans with an allowance recorded		43,929	45,853
Impaired loans with no allowance recorded		15,954	21,550
Total loans individually evaluated for impairment		59,883	67,403
Loans collectively evaluated for impairment		2,068,457	1,910,420
Total unpaid principal balance		2,223,527	2,086,758
Impaired loans with an allowance recorded		2,004	2,537
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		2,004	2,537
Loans collectively evaluated for impairment		13,891	13,734
Total loans held for investment		15,932	16,329
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		11,805	11,399
Impaired loans with no allowance recorded		2	2,350
Total loans individually evaluated for impairment		11,807	13,749
Loans collectively evaluated for impairment		4,555,653	3,312,629
Total recorded investment		4,576,303	3,326,708
Impaired loans with an allowance recorded		12,235	11,829
Impaired loans with no allowance recorded		2	4,104
Total loans individually evaluated for impairment		12,237	15,933
Loans collectively evaluated for impairment		4,555,653	3,312,629
Total unpaid principal balance		4,579,041	3,329,712
Impaired loans with an allowance recorded		1,685	1,926
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		1,685	1,926
Loans collectively evaluated for impairment		55,363	49,809
Total loans held for investment		57,048	51,766
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		13,477	19,300
Impaired loans with no allowance recorded		9,134	0
Total loans individually evaluated for impairment		22,611	19,300
Loans collectively evaluated for impairment		293,200	277,692
Total recorded investment		320,591	299,402
Impaired loans with an allowance recorded		17,196	24,420
Impaired loans with no allowance recorded		10,026	0
Total loans individually evaluated for impairment		27,222	24,420
Loans collectively evaluated for impairment		293,200	277,692
Total unpaid principal balance		326,274	305,551
Impaired loans with an allowance recorded		717	1,052
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		717	1,052
Loans collectively evaluated for impairment		5,682	6,404
Total loans held for investment		6,399	7,456
Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		18,542	21,052
Impaired loans with no allowance recorded		576	696
Total loans individually evaluated for impairment		19,118	21,748
Loans collectively evaluated for impairment		983,580	726,305
Total recorded investment		1,002,698	748,053
Impaired loans with an allowance recorded		18,659	21,169
Impaired loans with no allowance recorded		765	885
Total loans individually evaluated for impairment		19,424	22,054
Loans collectively evaluated for impairment		983,580	726,305
Total unpaid principal balance		1,003,004	748,359
Impaired loans with an allowance recorded		1,416	3,112
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		1,416	3,112
Loans collectively evaluated for impairment		18,121	15,446
Total loans held for investment		19,537	18,558
Commercial leases [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		10	41
Impaired loans with no allowance recorded		3,920	332
Total loans individually evaluated for impairment		3,930	373
Loans collectively evaluated for impairment		179,448	205,266
Total recorded investment		183,378	205,639
Impaired loans with an allowance recorded		10	41
Impaired loans with no allowance recorded		4,071	483
Total loans individually evaluated for impairment		4,081	524
Loans collectively evaluated for impairment		179,448	205,266
Total unpaid principal balance		183,529	205,790
Impaired loans with an allowance recorded		1	39
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		1	39
Loans collectively evaluated for impairment		2,540	2,761
Total loans held for investment		2,541	2,800
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded		126	175
Impaired loans with no allowance recorded		197	188
Total loans individually evaluated for impairment		323	363
Loans collectively evaluated for impairment		23,630	32,646
Total recorded investment		23,953	33,009
Impaired loans with an allowance recorded		139	187
Impaired loans with no allowance recorded		197	188
Total loans individually evaluated for impairment		336	375
Loans collectively evaluated for impairment		23,630	32,646
Total unpaid principal balance		23,966	33,021
Impaired loans with an allowance recorded		4	17
Impaired loans with no allowance recorded		0	0
Total loans individually evaluated for impairment		4	17
Loans collectively evaluated for impairment		581	836
Total loans held for investment		585	853
Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Loans acquired with deteriorated credit quality		135,314	137,797
Impaired loans with an allowance recorded		37	263
Receivables Acquired with Deteriorated Credit Quality [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		17,322	17,912
Loans acquired with deteriorated credit quality		23,124	24,273
Impaired loans with an allowance recorded		0	174
Receivables Acquired with Deteriorated Credit Quality [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		98,482	96,474
Receivables Acquired with Deteriorated Credit Quality [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		67,537	75,822
Loans acquired with deteriorated credit quality		95,187	108,935
Impaired loans with an allowance recorded		37	58
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		8,843	330
Loans acquired with deteriorated credit quality		11,151	1,150
Impaired loans with an allowance recorded		0	31
Receivables Acquired with Deteriorated Credit Quality [Member] | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		4,780	2,410
Loans acquired with deteriorated credit quality		5,852	3,439
Impaired loans with an allowance recorded		0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		0	0
Loans acquired with deteriorated credit quality		0	0
Impaired loans with an allowance recorded		0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial leases [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		0	0
Loans acquired with deteriorated credit quality		0	0
Impaired loans with an allowance recorded		0	0
Receivables Acquired with Deteriorated Credit Quality [Member] | Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment		0	0
Loans acquired with deteriorated credit quality		0	0
Impaired loans with an allowance recorded		$ 0	$ 0

[1] Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

[3] Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

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Investment Securities - Additional Information (Detail) $ in Thousands	3 Months Ended
	Jun. 30, 2015 USD ($) positions	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) positions
Investment Identifier [Line Items]
Amount of impairment losses reclassified out of accumulated other comprehensive income into earnings	$ 0	$ 0
Total number of securities in an unrealized loss position | positions	105		109
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 11,414		$ 13,891
Securities with carrying amounts were pledged	$ 658,800		$ 755,500

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Other Borrowings (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s borrowings as of June 30, 2015 and December 31, 2014: 

	June 30, 2015		December 31, 2014
	(in thousands)
Short-Term:
Revolving line of credit	$	—	$	25,000
FHLB advances	11,051		96,987
Other short-term debt	58,378		58,182
Total short-term borrowings	$	69,429	$	180,169
Long-Term:
FHLB advances	$	—	$	210,094
Total long-term borrowings	$	—	$	210,094

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Other Assets Acquired Through Foreclosure (Tables)

6 Months Ended

Jun. 30, 2015

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Changes in Other Assets Acquired Through Foreclosure

The following table represents the changes in other assets acquired through foreclosure: 

	Three Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	77,968		$	(14,209	)	$	63,759
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	5,739			—			5,739
Proceeds from sale of other real estate owned and repossessed assets, net	(15,415		)	2,480			(12,935		)
Valuation adjustments, net	—			(718		)	(718		)
Gains, net (1)	1,940			—			1,940
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	72,226		$	(15,776	)	$	56,450
Transfers to other assets acquired through foreclosure, net	4,309			—			4,309
Proceeds from sale of other real estate owned and repossessed assets, net	(1,903		)	683			(1,220		)
Valuation adjustments, net	—			(258		)	(258		)
Gains, net (1)	11			—			11
Balance, end of period	$	74,643		$	(15,351	)	$	59,292
	Six Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	13,459			—			13,459
Proceeds from sale of other real estate owned and repossessed assets, net	(17,703		)	3,328			(14,375		)
Valuation adjustments, net	—			(1,504		)	(1,504		)
Gains, net (2)	3,055			—			3,055
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	6,419			—			6,419
Proceeds from sale of other real estate owned and repossessed assets, net	(21,376		)	6,644			(14,732		)
Valuation adjustments, net	—			(293		)	(293		)
Gains, net (2)	1,179			—			1,179
Balance, end of period	$	74,643		$	(15,351	)	$	59,292

(1) Includes net gains related to initial transfers to other assets of zero during both the three months ended June 30, 2015 and 2014, pursuant to accounting guidance.

(2) Includes net gains related to initial transfers to other assets of $0.6 million and zero during the six months ended June 30, 2015 and 2014, respectively, pursuant to accounting guidance.

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Loans, Leases and Allowance for Credit Losses - Schedule of Average Investment in Impaired Loans and Income Recognized on Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Receivables [Abstract]
Impaired Financing Receivable, Average Recorded Investment	$ 155,943	$ 167,326	$ 159,186	$ 170,010
Interest income recognized on impaired loans	1,126	1,435	2,310	2,821
Interest recognized on nonaccrual loans, cash basis	$ 548	$ 566	$ 1,201	$ 1,172

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Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	$ 1,966	$ 1,002
Available-for-sale securities, Less Than Twelve Months, Fair Value	210,677	122,799
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	9,448	12,889
Available-for-sale securities, Twelve Months or Longer, Fair Value	127,883	229,480
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	11,414	13,891
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	338,560	352,279
US Government-sponsored Enterprises Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0	0
Available-for-sale securities, Less Than Twelve Months, Fair Value	0	0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	297	355
Available-for-sale securities, Twelve Months or Longer, Fair Value	18,403	18,346
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	297	355
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	18,403	18,346
Corporate debt securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses		139
Available-for-sale securities, Less Than Twelve Months, Fair Value		9,860
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses		862
Available-for-sale securities, Twelve Months or Longer, Fair Value		29,139
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total		1,001
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total		38,999
Preferred Stock [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	513	232
Available-for-sale securities, Less Than Twelve Months, Fair Value	16,791	13,811
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	1,259	2,447
Available-for-sale securities, Twelve Months or Longer, Fair Value	17,798	28,109
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	1,772	2,679
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	34,589	41,920
Mutual funds [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses		247
Available-for-sale securities, Less Than Twelve Months, Fair Value		25,855
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses		0
Available-for-sale securities, Twelve Months or Longer, Fair Value		0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total		247
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total		25,855
Residential mortgage-backed securities issued by GSEs
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	655	227
Available-for-sale securities, Less Than Twelve Months, Fair Value	116,929	49,217
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	966	1,758
Available-for-sale securities, Twelve Months or Longer, Fair Value	43,114	97,296
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	1,621	1,985
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	160,043	146,513
Municipal obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	371	0
Available-for-sale securities, Less Than Twelve Months, Fair Value	20,722	0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0	49
Available-for-sale securities, Twelve Months or Longer, Fair Value	0	4,430
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	371	49
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	20,722	4,430
Private label residential mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	365	157
Available-for-sale securities, Less Than Twelve Months, Fair Value	31,789	24,056
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	574	964
Available-for-sale securities, Twelve Months or Longer, Fair Value	22,920	26,614
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	939	1,121
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	54,709	50,670
Trust preferred securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0	0
Available-for-sale securities, Less Than Twelve Months, Fair Value	0	0
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	6,352	6,454
Available-for-sale securities, Twelve Months or Longer, Fair Value	25,648	25,546
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	6,352	6,454
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	25,648	$ 25,546
CRA investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	62
Available-for-sale securities, Less Than Twelve Months, Fair Value	24,446
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	0
Available-for-sale securities, Twelve Months or Longer, Fair Value	0
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	62
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	$ 24,446

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Accumulated Other Comprehensive Income (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Summary of Changes in Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Three Months Ended June 30,
	2015										2014
	Unrealized holding gains (losses) on AFS			Unrealized holding gains on SERP		Impairment loss on securities		Total			Unrealized holding gains (losses) on AFS			Impairment loss on securities		Total
	(in thousands)
Beginning Balance	$	23,279		$	—	$	144	$	23,423		$	(11,275	)	$	144	$	(11,131	)
SERP assumed in Bridge acquisition	—			337		—		337			—			—		—
Transfer of HTM securities to AFS	—			—		—		—			8,976			—		8,976
Other comprehensive (loss) income before reclassifications	(8,378		)	—		—		(8,378		)	10,525			—		10,525
Amounts reclassified from accumulated other comprehensive income	(34		)	—		—		(34		)	102			—		102
Net current-period other comprehensive (loss) income	(8,412		)	337		—		(8,075		)	19,603			—		19,603
Ending Balance	$	14,867		$	337	$	144	$	15,348		$	8,328		$	144	$	8,472

	Six Months Ended June 30,
	2015										2014
	Unrealized holding gains (losses) on AFS			Unrealized holding gains on SERP		Impairment loss on securities		Total			Unrealized holding gains (losses) on AFS			Impairment loss on securities		Total
	(in thousands)
Beginning Balance	$	16,495		$	—	$	144	$	16,639		$	(21,690	)	$	144	$	(21,546	)
SERP assumed in Bridge acquisition	—			337		—		337
Transfer of HTM securities to AFS	—			—		—		—			8,976			—		8,976
Other comprehensive (loss) income before reclassifications	(1,225		)	—		—		(1,225		)	21,169			—		21,169
Amounts reclassified from accumulated other comprehensive income	(403		)	—		—		(403		)	(127		)	—		(127		)
Net current-period other comprehensive (loss) income	(1,628		)	337		—		(1,291		)	30,018			—		30,018
Ending Balance	$	14,867		$	337	$	144	$	15,348		$	8,328		$	144	$	8,472

Schedule of Reclassifications Out of Accumulated Other Comprehensive Income

The following table presents reclassifications out of accumulated other comprehensive income (loss): 

	Three Months Ended June 30,						Six Months Ended June 30,
Income Statement Classification	2015			2014			2015			2014
	(in thousands)
Gain (loss) on sales of investment securities, net	$	55		$	(163	)	$	644		$	203
Income tax expense	(21		)	61			(241		)	(76		)
Net of tax	$	34		$	(102	)	$	403		$	127

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Stockholders' Equity Schedule of Share-based Compensation Arrangements by Share-based Payment Award (Tables)

Jun. 30, 2015

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06

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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	$ 1,761,951	$ 0
Cash flows from operating activities:
Net income	74,909	66,623
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	700	4,007
Depreciation and amortization	3,943	3,220
Stock-based compensation	7,908	6,039
Excess tax benefit of stock-based compensation	(5,164)	(1,830)
Deferred income taxes	(2,345)	(6,665)
Amortization of net premiums for investment securities	4,133	4,048
Accretion And Amortization Fair Market Value Adjustments Relating To Acquisitions of Loans	(4,118)	(8,962)
Accretion and Amortization Fair Market Value Adjustments Relating to Acquisitions of Other Assets and Liabilities	247	(193)
Income from bank owned life insurance	(1,749)	(1,908)
Unrealized losses on assets and liabilities measured at fair value, net	8,194	1,041
(Gains) / Losses on:
Sales of investment securities	(644)	(203)
Sale of Loans	(319)	0
Gains (Losses) on Extinguishment of Debt	(81)	0
Other assets acquired through foreclosure, net	(3,055)	(1,179)
Valuation adjustments of other repossessed assets, net	1,504	293
Sale of premises, equipment, and other assets, net	(18)	(1,491)
Changes in, net of acquisitions:
Other assets	8,742	7,419
Other liabilities	(15,996)	(9,738)
Net cash provided by operating activities	76,953	60,521
Investment securities - measured at fair value
Principal pay downs and maturities	143	261
Investment securities - AFS
Purchases	(94,532)	(38,785)
Principal pay downs and maturities	114,127	124,615
Proceeds from sales	78,040	26,840
Principal pay downs and maturities of held-to-maturity securities	0	6,600
Purchase of investment tax credits	(11,884)	(16,948)
Proceeds from Sale (Payments to Purchase) Investment In Money Market	(424)	1,225
(Purchase) liquidation of restricted stock	(18,749)	4,911
Loan fundings and principal collections, net	(515,143)	(719,720)
Purchase of premises, equipment, and other assets, net	(3,886)	(5,491)
Proceeds from sale of other real estate owned and repossessed assets, net	14,375	14,732
Net cash used in investing activities	(95,506)	(601,760)
Cash flows from financing activities:
Net increase in deposits	733,788	631,609
Proceeds from Issuance of Subordinated Long-term Debt	148,450	0
Net decrease in borrowings	(276,023)	(22,334)
Proceeds from exercise of common stock options	1,537	1,996
Excess tax benefit of stock-based compensation	5,164	1,830
Cash dividends paid on preferred stock	(423)	(705)
Proceeds from Issuance of Common Stock	0	2,611
Net cash provided by financing activities	612,493	615,007
Net increase in cash and cash equivalents	593,940	73,768
Cash and cash equivalents at beginning of period	164,396	305,514
Cash and cash equivalents at end of period	758,336	379,282
Cash paid during the period for:
Interest	13,881	10,423
Income taxes	25,801	17,180
Non-cash investing and financing activity:
Transfers to other assets acquired through foreclosure, net	13,459	6,419
Change in unfunded investment tax credits and SBIC commitments	2,168	12,298
Available-for-sale Securities, Change in Net Unrealized Holding Gain (Loss), Net of Tax	(1,628)	21,042
Business Combination Noncash Assets Acquired At Fair Value	1,590,927	0
Change in Unfunded Obligations Non Cash	13,654	(9,506)
Cash Acquired from Acquisition	$ 342,427	$ 0

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Derivatives and Hedging (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position

The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities in the Consolidated Balance Sheets, as indicated in the following table:

	June 30, 2015						December 31, 2014						June 30, 2014
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in thousands)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate swaps	$	828,036	$	198	$	49,037	$	647,703	$	7	$	57,820	$	568,006	$	2	$	29,129
Total	828,036		198		49,037		647,703		7		57,820		568,006		2		29,129
Netting adjustments (1)	—		—		—		—		—		—		—		2		2
Net derivatives in the balance sheet	$	828,036	$	198	$	49,037	$	647,703	$	7	$	57,820	$	568,006	$	—	$	29,127

(1) Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

Gain (Loss) on Derivative Instruments

The following table summarizes the pre-tax net gains (losses) on fair value hedges for the three and six months ended June 30, 2015 and June 30, 2014 and where they are recorded in the income statement.

	Three Months Ended June 30,
	2015					2014
Income Statement Classification	Net Gain (Loss) on Derivatives		Increase (Decrease) to Basis of Hedged Asset/Liability (a)			Net Gain (Loss) on Derivatives			Increase (Decrease) to Basis of Hedged Asset/Liability (a)
	(in thousands)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	$	24,201	$	(24,186	)	$	(16,635	)	$	16,795
	Six Months Ended June 30,
	2015					2014
Income Statement Classification	Net Gain (Loss) on Derivatives		Increase (Decrease) to Basis of Hedged Asset/Liability (a)			Net Gain (Loss) on Derivatives			Increase (Decrease) to Basis of Hedged Asset/Liability (a)
	(in thousands)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	$	8,971	$	(8,950	)	$	(31,774	)	$	31,570

(a) Net gain (loss) on loans represent the change in fair value caused by fluctuations in interest rates; differences relate to ineffectiveness associated with the fair value hedge.

Largest Exposure To Individual Counterparty

The following table summarizes our largest exposure to an individual counterparty at the dates indicated:

	June 30, 2015		December 31, 2014		June 30, 2014
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	198	$	7	$	2
Collateral posted by this counterparty	—		—		—
Derivative liability with this counterparty	—		—		28,874
Collateral pledged to this counterparty	—		—		28,872
Net exposure after netting adjustments and collateral	$	198	$	7	$	—

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Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Dec. 31, 2012
Earnings Per Share [Abstract]
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share			0		1,500
Basic	88,177,000	86,501,000	88,059,000	86,379,000		88,059,000
Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards	505,000	832,000	508,000	850,000
Diluted	88,682,000	87,333,000	88,567,000	87,229,000		88,567,000
Net income available to common shareholders	$ 34,472	$ 35,186	$ 74,486	$ 65,918
Earnings (loss) per share - basic	$ 0.39	$ 0.41	$ 0.85	$ 0.76		$ 0.85
Earnings (loss) per share - diluted	$ 0.39	$ 0.40	$ 0.84	$ 0.76		$ 0.84

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Mergers, Acquisitions and Dispositions Business Combination, Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition / restructure expense	$ 7,842	$ 26	$ 8,001	$ 183
Bridge Capital Holdings [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Acquisition / restructure expense	5,624		6,814
Business Acquisition, Pro Forma Interest Income	139,080	121,744	271,502	239,072
Business Acquisition, Pro Forma Non-Interest Income	1,840	9,578	11,047	16,882
Business Acquisition, Pro Forma Net Income (Loss)	$ 45,607	$ 39,452	$ 90,372	$ 73,901
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.45	$ 0.40	$ 0.89	$ 0.74
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.44	$ 0.39	$ 0.88	$ 0.73

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Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) - USD ($)	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	$ 10,321,221,000	$ 8,398,265,000
Current	10,295,162,000	8,366,782,000
Financing Receivable, Recorded Investment, Past Due	26,059,000	31,483,000
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	320,591,000	299,402,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	23,953,000	33,009,000
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,019,280,000	1,732,888,000
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,004,386,000	1,869,941,000
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	190,632,000	182,625,000
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,576,303,000	3,326,708,000
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	183,378,000	205,639,000
Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	597,059,000	388,399,000
Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	405,639,000	359,654,000
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	10,029,715,000	8,143,813,000
Current	10,027,949,000	8,140,140,000
Pass [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	299,941,000	284,052,000
Pass [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	23,318,000	32,419,000
Pass [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,957,152,000	1,664,270,000
Pass [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,932,983,000	1,771,138,000
Pass [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	188,894,000	182,180,000
Pass [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	4,473,382,000	3,295,027,000
Pass [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	173,634,000	202,772,000
Pass [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	594,752,000	383,677,000
Pass [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	385,659,000	328,278,000
Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	131,818,000	97,505,000
Current	129,876,000	95,091,000
Watch [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,288,000	2,044,000
Watch [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	377,000	233,000
Watch [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	33,347,000	28,072,000
Watch [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	20,676,000	35,752,000
Watch [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Watch [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	66,656,000	14,380,000
Watch [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	5,793,000	2,494,000
Watch [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	2,307,000	4,241,000
Watch [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	374,000	10,289,000
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	158,978,000	155,028,000
Current	136,627,000	129,787,000
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	18,362,000	13,306,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	258,000	357,000
Substandard [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	28,071,000	39,222,000
Substandard [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	50,727,000	62,611,000
Substandard [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	1,738,000	445,000
Substandard [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	36,265,000	17,146,000
Substandard [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	3,951,000	373,000
Substandard [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	481,000
Substandard [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	19,606,000	21,087,000
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	710,000	1,919,000
Current	710,000	1,764,000
Doubtful [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	710,000	1,324,000
Doubtful [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	440,000
Doubtful [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	155,000
Doubtful [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Doubtful [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Current	0	0
Loss [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Loss [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	2,398,000	7,842,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,330,000	2,771,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	769,000	198,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	299,000	4,718,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	155,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,609,000	6,867,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	436,000	385,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	1,173,000	37,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	6,445,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	22,052,000	16,774,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	517,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	2,179,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	22,052,000	14,078,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Past Due	$ 0	$ 0

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Qualifying Debt Subordinated Debt Details (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)
Subordinated Debt Details [Abstract]
Debt Issuance Cost	$ (1.6)

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CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets:
Cash and due from banks	$ 149,929	$ 125,329
Securities Purchased under Agreements to Resell	58,150	0
Interest-bearing deposits in other financial institutions	550,257	39,067
Cash and cash equivalents	758,336	164,396
Money Market Funds, at Carrying Value	875	451
Investment securities - measured at fair value	1,701	1,858
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014	1,478,234	1,520,237
Investments in restricted stock, at cost	51,040	25,275
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group	39,401	0
Loans:
Loans, net of deferred loan fees and costs	10,321,221	8,398,265
Less: Allowance for credit losses	(115,056)	(110,216)
Total loans held for investment	10,206,165	8,288,049
Premises and equipment, net	116,044	113,818
Other assets acquired through foreclosure, net	59,335	57,150
Bank owned life insurance	161,100	141,969
Goodwill	282,851	23,224
Other intangible assets, net	17,124	2,689
Deferred tax assets, net	82,075	62,686
Other assets	215,823	198,696
Total assets	13,470,104	10,600,498
Deposits:
Non-interest-bearing demand	3,924,456	2,288,048
Interest-bearing	7,482,272	6,642,995
Total deposits	11,406,728	8,931,043
Customer repurchase agreements	42,172	54,899
Securities for Reverse Repurchase Agreements	57,580	0
Other borrowings	69,429	390,263
Qualifying debt	208,417	40,437
Other liabilities	171,034	182,928
Total liabilities	$ 11,955,360	$ 9,599,570
Commitments and Contingencies
Stockholders’ equity:
Preferred stock - par value $0.0001 and liquidation value per share of $1,000; 20,000,000 authorized; 70,500 shares issued and outstanding at June 30, 2015 and December 31, 2014	$ 70,500	$ 70,500
Common stock - par value $0.0001; 200,000,000 authorized; 102,290,865 shares issued and outstanding at June 30, 2015 and 88,691,249 at December 31, 2014	10	9
Additional paid in capital	1,268,947	828,327
Accumulated other comprehensive income	159,939	85,453
Retained earnings	15,348	16,639
Total stockholders’ equity	1,514,744	1,000,928
Total liabilities and stockholders’ equity	$ 13,470,104	$ 10,600,498

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Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale, Due in one year or less, Amortized Cost	$ 45,871
Securities available for sale, After one year through five years, Amortized Cost	68,992
Securities available for sale, After five years through ten years, Amortized Cost	102,814
Securities available for sale, After ten years, Amortized Cost	253,649
Securities available for sale, Mortgage backed securities, Amortized Cost	982,494
Securities available for sale Total, Amortized Cost	1,453,820	$ 1,493,648
Securities available for sale, Due in one year or less, Estimated Fair Value	45,989
Securities available for sale, After one year through five years, Estimated Fair Value	71,415
Securities available for sale, After five years through ten years, Estimated Fair Value	105,800
Securities available for sale, After ten years, Estimated Fair Value	263,414
Securities available for sale, Mortgage backed securities, Estimated Fair Value	991,616
Securities available for sale Total, Estimated Fair Value	$ 1,478,234	$ 1,520,237

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Regulatory Capital Requirements - Summary of Actual Capital Amount and Ratio (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%	10.00%
Capital Required for Capital Adequacy to Risk Weighted Assets	8.00%	8.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%	6.00%
Tier 1 Capital Ratio	6.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Common Equity Tier One Required To Be Well Capitalized	6.50%
Tier 1 Leverage Ratio	4.00%	4.00%
Common Equity Tier One Required For Capital Adequacy	4.50%
Consolidated Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital	$ 1,522,991	$ 1,119,618
Tier 1 Capital	1,269,033	1,007,278
Risk-Weighted Assets	12,435,603	9,555,390
Tangible Average Assets	$ 12,733,458	$ 10,367,575
Capital to Risk Weighted Assets	12.20%	11.70%
Tier One Risk Based Capital to Risk Weighted Assets	10.20%	10.50%
Tier One Leverage Capital to Average Assets	10.00%	9.70%
Common Equity Tier One Risk-Based Capital Ratio	9.10%
Western Alliance Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital	$ 1,408,273	$ 1,057,253
Tier 1 Capital	1,142,684	945,687
Risk-Weighted Assets	12,326,696	9,435,459
Tangible Average Assets	$ 12,549,292	$ 10,232,297
Capital to Risk Weighted Assets	11.40%	11.20%
Tier One Risk Based Capital to Risk Weighted Assets	9.30%	10.00%
Tier One Leverage Capital to Average Assets	9.10%	9.20%
Common Equity Tier One Risk-Based Capital Ratio	9.30%

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Tax	$ 0	$ (5,367)	$ 0	$ (5,367)
Unrealized gain on securities available-for-sale securities, tax	(5,135)	6,294	(858)	12,658
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	(207)	0	(207)	0
Realized gain on sale of securities, tax	$ 21	$ (61)	$ 241	$ 76

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Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2015		Dec. 31, 2014		Jun. 30, 2014
Financial assets
Securities available for sale	$ 1,478,234		$ 1,520,237
Securities measured at fair value	1,701		1,858
Derivative Asset	198		7		$ 0
Loans, net	10,206,165		8,288,049		7,438,600
Financial liabilities
Deposits	11,406,728		8,931,043		8,469,500
Customer repurchases	42,172		54,899
FHLB and FRB advances	11,051		96,987
Junior subordinated debt	48,482		40,437
Derivative Liability	49,037		57,820		$ 29,127
Fair Value, Measurements, Recurring [Member]
Financial assets
Securities available for sale	1,478,234		1,520,237
Derivative Asset	198	[1]	7	[2]
Financial liabilities
Derivative Liability	49,037	[1]	57,820	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Financial assets
Securities available for sale	169,899		144,646
Derivative Asset	0	[1]	0	[2]
Financial liabilities
Junior subordinated debt	0		0
Derivative Liability	0	[1]	0	[2]
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Financial assets
Securities available for sale	1,297,531		1,364,146
Derivative Asset	198	[1]	7	[2]
Financial liabilities
Junior subordinated debt	0		0
Derivative Liability	49,037	[1]	57,820	[2]
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Financial assets
Securities available for sale	10,804		11,445
Derivative Asset	0	[1]	0	[2]
Financial liabilities
Junior subordinated debt	48,482		40,437
Derivative Liability	0	[1]	0	[2]
Fair Value, Measurements, Recurring [Member] | Carrying Amount [Member]
Financial assets
Securities available for sale	1,478,234		1,520,237
Securities measured at fair value	1,701		1,858
Derivative Asset	198		7
Loans, net	10,245,566		8,288,049
Accrued Investment Income Receivable	46,222		36,705
Financial liabilities
Deposits	11,406,728		8,931,043
Customer repurchases	42,172		54,899
Federal Home Loan Bank Borrowings, Fair Value Disclosure	11,051		307,081
Other borrowed funds	58,378		83,182
Junior subordinated debt	208,417		40,437
Derivative Liability	49,037		57,820
Interest Payable, Current	11,764		9,890
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]
Financial assets
Securities available for sale	1,478,234		1,520,237
Securities measured at fair value	1,701		1,858
Derivative Asset	198		7
Loans, net	10,028,621		8,136,874
Accrued Investment Income Receivable	46,222		36,705
Financial liabilities
Deposits	11,410,560		8,935,566
Customer repurchases	42,172		54,899
Federal Home Loan Bank Borrowings, Fair Value Disclosure	11,051		307,081
Other borrowed funds	58,637		86,074
Junior subordinated debt	209,019		40,437
Derivative Liability	49,037		57,820
Interest Payable, Current	11,764		9,890
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 1 [Member]
Financial assets
Securities available for sale	169,899		144,646
Securities measured at fair value	0		0
Derivative Asset	0		0
Loans, net	0		0
Accrued Investment Income Receivable	0		0
Financial liabilities
Deposits	0		0
Customer repurchases	0		0
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0		0
Other borrowed funds	0		0
Junior subordinated debt	0		0
Derivative Liability	0		0
Interest Payable, Current	0		0
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 2 [Member]
Financial assets
Securities available for sale	1,297,531		1,364,146
Securities measured at fair value	1,701		1,858
Derivative Asset	198		7
Loans, net	9,891,399		7,984,692
Accrued Investment Income Receivable	46,222		36,705
Financial liabilities
Deposits	11,410,560		8,935,566
Customer repurchases	42,172		54,899
Federal Home Loan Bank Borrowings, Fair Value Disclosure	11,051		307,081
Other borrowed funds	0		25,000
Junior subordinated debt	0		0
Derivative Liability	49,037		57,820
Interest Payable, Current	11,764		9,890
Fair Value, Measurements, Recurring [Member] | Fair Value [Member] | Level 3 [Member]
Financial assets
Securities available for sale	10,804		11,445
Securities measured at fair value	0		0
Derivative Asset	0		0
Loans, net	137,222		152,182
Accrued Investment Income Receivable	0		0
Financial liabilities
Deposits	0		0
Customer repurchases	0		0
Federal Home Loan Bank Borrowings, Fair Value Disclosure	0		0
Other borrowed funds	58,637		61,074
Junior subordinated debt	209,019		40,437
Derivative Liability	0		0
Interest Payable, Current	$ 0		$ 0

[1] Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $48,258 as of June 30, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

[2] Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

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Loans, Leases and Allowance for Credit Losses - Tabular Disclosure of Nonperforming Assets (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 59,425		$ 67,659
Loans past due 90 days or more on accrual status		8,284		5,132
Troubled debt restructured loans	[2]	80,192		84,720
Total nonperforming loans		147,901		157,511
Other assets acquired through foreclosure, net		59,335	$ 63,759	57,150	$ 59,292	$ 56,450	$ 66,719
Total nonperforming assets		207,236		214,661
Troubled Debt Restructured Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status		$ 42,600		$ 53,600

[1] Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes accruing TDR loans only.

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Fair Value Accounting (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations

For the three and six months ended June 30, 2015 and 2014, gains and losses from fair value changes included in the Consolidated Income Statements were as follows: 

	Changes in Fair Values for Items Measured at Fair Pursuant to Election of the Fair Value Option
	Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net			Interest Income on Securities		Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings
	(in thousands)
Three Months Ended June 30, 2015
Securities measured at fair value	$	(9	)	$	1	$	—		$	(8	)
Junior subordinated debt	(7,736		)	—		451			(7,285		)
Total	$	(7,745	)	$	1	$	451		$	(7,293	)
Six Months Ended June 30, 2015
Securities measured at fair value	$	(14	)	$	1	$	—		$	(13	)
Junior subordinated debt	(8,045		)	—		892			(7,153		)
Total	$	(8,059	)	$	1	$	892		$	(7,166	)
Three Months Ended June 30, 2014
Securities measured at fair value	$	(2	)	$	1	$	—		$	(1	)
Junior subordinated debt	125			—		(443		)	(318		)
Total	$	123		$	1	$	(443	)	$	(319	)
Six Months Ended June 30, 2014
Securities measured at fair value	$	16		$	2	$	—		$	18
Junior subordinated debt	(853		)	—		(864		)	(1,717		)
Total	$	(837	)	$	2	$	(864	)	$	(1,699	)

Fair Value of Assets and Liabilities

The fair value of assets and liabilities measured at fair value on a recurring basis were determined using the following inputs as of the periods presented: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
June 30, 2015
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,701	$	—	$	1,701
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	10,804	$	10,804
Commercial MBS issued by GSEs	11,126		2,083		—		13,209
Corporate debt securities	326		13,339		—		13,665
CRA investments	32,537		—		—		32,537
Municipal obligations	1,235		291,178		—		292,413
Preferred stock	83,051		—		—		83,051
Private label commercial MBS	—		4,979		—		4,979
Private label residential MBS	31,527		70,544		—		102,071
Residential MBS issued by GSEs	—		871,357		—		871,357
Trust preferred securities	—		25,648		—		25,648
U.S. government sponsored agency securities	6,206		18,403		—		24,609
U.S. treasury securities	3,891		—		—		3,891
Total AFS securities	$	169,899	$	1,297,531	$	10,804	$	1,478,234
Derivative assets (1)	$	—	$	198	$	—	$	198
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	48,482	$	48,482
Derivative liabilities (1)	—		49,037		—		49,037

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $48,258 as of June 30, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

(2) Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2014
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	1,858
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	11,445	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		2,147
Corporate debt securities	—		52,489		—		52,489
CRA investments	24,332		—		—		24,332
Municipal obligations	—		299,037		—		299,037
Mutual funds	37,702		—		—		37,702
Preferred stock	82,612		—		—		82,612
Private label commercial MBS	—		5,149		—		5,149
Private label residential MBS	—		70,243		—		70,243
Residential MBS issued by GSEs	—		891,189		—		891,189
Trust preferred securities	—		25,546		—		25,546
U.S. government sponsored agency securities	—		18,346		—		18,346
Total AFS securities	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Derivative assets (1)	$	—	$	7	$	—	$	7
Liabilities:
Junior subordinated debt	$	—	$	—	$	40,437	$	40,437
Derivative liabilities (1)	—		57,820		—		57,820

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis

For the three and six months ended June 30, 2015 and 2014, the change in Level 3 assets and liabilities measured at fair value on a recurring basis was as follows: 

	Junior Subordinated Debt
	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Beginning balance	$	(40,746	)	$	(42,836	)	$	(40,437	)	$	(41,858	)
Transfers into Level 3	—			—			—			—
Total gains (losses) for the period
Included in earnings (1)	(7,736		)	125			(8,045		)	(853		)
Ending balance	$	(48,482	)	$	(42,711	)	$	(48,482	)	$	(42,711	)
Change in unrealized gains (losses) for the period included in earnings	$	(7,736	)	$	125		$	(8,045	)	$	(853	)

	CDO Securities
	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015			2014
	(in thousands)
Beginning balance	$	10,520	$	—	$	11,445		$	—
Transfers into Level 3	—		58		—			58
Total gains (losses) for the period
Included in other comprehensive income (2)	284		—		$	(641	)	$	—
Ending balance	$	10,804	$	58	$	10,804		$	58

(1) Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

(2) Total gains (losses) for the period are included in the other comprehensive income line, Unrealized (loss) gain on AFS securities.

For Level 3 liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014, the significant unobservable inputs used in the fair value measurements were as follows: 

	June 30, 2015		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	48,482	Discounted cash flow	Implied credit rating of the Company
CDO securities	10,804		S&P Model	Pricing indications from comparable securities

	December 31, 2014		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	40,437	Discounted cash flow	Adjusted Corporate Bond over Treasury Index with comparable credit spread
CDO securities	11,445		S&P Model	Pricing indications from comparable securities

Assets Measured at Fair Value on Nonrecurring Basis

The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in thousands)
As of June 30, 2015:
Impaired loans with specific valuation allowance	$	99,212	$	—	$	—	$	99,212
Impaired loans without specific valuation allowance (1)	38,010		—		—		38,010
Other assets acquired through foreclosure	59,335		—		—		59,335
As of December 31, 2014:
Impaired loans with specific valuation allowance	$	114,163	$	—	$	—	$	114,163
Impaired loans without specific valuation allowance (1)	38,019		—		—		38,019
Other assets acquired through foreclosure	57,150		—		—		57,150

(1) Excludes loan balances with charge-offs of $6.8 million and $3.8 million as of June 30, 2015 and December 31, 2014, respectively.

Estimated Fair Value of Financial Instruments

The estimated fair value of the Company’s financial instruments is as follows: 

	June 30, 2015
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,478,234	$	169,899	$	1,297,531	$	10,804	$	1,478,234
Trading	1,701		—		1,701		—		1,701
Derivative assets	198		—		198		—		198
Loans, net	10,245,566		—		9,891,399		137,222		10,028,621
Accrued interest receivable	46,222		—		46,222		—		46,222
Financial liabilities:
Deposits	$	11,406,728	$	—	$	11,410,560	$	—	$	11,410,560
Customer repurchases	42,172		—		42,172		—		42,172
FHLB and FRB advances	11,051		—		11,051		—		11,051
Other borrowed funds	58,378		—		—		58,637		58,637
Qualifying debt	208,417		—		—		209,019		209,019
Derivative liabilities	49,037		—		49,037		—		49,037
Accrued interest payable	11,764		—		11,764		—		11,764

	December 31, 2014
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,520,237	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Trading	1,858		—		1,858		—		1,858
Derivative assets	7		—		7		—		7
Loans, net	8,288,049		—		7,984,692		152,182		8,136,874
Accrued interest receivable	36,705		—		36,705		—		36,705
Financial liabilities:
Deposits	$	8,931,043	$	—	$	8,935,566	$	—	$	8,935,566
Customer repurchases	54,899		—		54,899		—		54,899
FHLB and FRB advances	307,081		—		307,081		—		307,081
Other borrowed funds	83,182		—		25,000		61,074		86,074
Junior subordinated debt	40,437		—		—		40,437		40,437
Derivative liabilities	57,820		—		57,820		—		57,820
Accrued interest payable	9,890		—		9,890		—		9,890

XML

Loans, Leases and Allowance for Credit Losses - Summary of Aggregate Activity in Loans (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Finance Receivable Transferred To Held For Sale [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	[1]	$ 59,425		$ 59,425		$ 67,659
Impaired Financing Receivable, Average Recorded Investment		155,943	$ 167,326	159,186	$ 170,010
Impaired loans with an allowance recorded	[2]	106,369		106,369		124,928
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans		700	800	1,400	1,800
Impaired loans with no allowance recorded	[3]	44,780		44,780		41,822
Impaired loans with an allowance recorded	[4]	7,157		7,157		10,765
Loans And Loans Receivable Purchases		7,700	16,700	26,100	32,300
Troubled Debt Restructured Loans [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Loan commitments outstanding		0		0		1,200
Financing Receivable, Recorded Investment, Nonaccrual Status		42,600		42,600		53,600
Impaired Financing Receivable, Average Recorded Investment		121,200	$ 123,600	123,600	$ 126,600
Impaired loans with an allowance recorded		92,700		92,700		103,300
Impaired loans with no allowance recorded		30,100		30,100		35,000
Impaired loans with an allowance recorded		5,600		5,600		8,900
Commercial and industrial [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Impaired loans with an allowance recorded		11,805		11,805		11,399
Impaired loans with no allowance recorded		2		2		2,350
Impaired loans with an allowance recorded		1,685		1,685		1,926
Loans And Loans Receivable Purchases				13,000
Commercial real estate [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Loans And Loans Receivable Purchases				13,100
Commercial leases [Member]
Finance Receivable Transferred To Held For Sale [Line Items]
Impaired loans with an allowance recorded		10		10		41
Impaired loans with no allowance recorded		3,920		3,920		332
Impaired loans with an allowance recorded		$ 1		$ 1		$ 39

[1] Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

[3] Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

[4] Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

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Regulatory Capital Requirements

6 Months Ended

Jun. 30, 2015

Banking and Thrift [Abstract]

Regulatory Capital Requirements

The Company and WAB are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements could trigger certain mandatory or discretionary actions that, if undertaken, could have a direct material effect on the Company’s business and financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and WAB must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.

The capital framework under Basel III became effective for the Company on January 1, 2015. Under the Basel III final rules, minimum requirements have increased for both the quantity and quality of capital held by the Company. A new capital conservation buffer, comprised of common equity Tier 1 capital, is also established above the regulatory minimum capital requirements. This capital conservation buffer will be phased in beginning January 1, 2016 at 0.625% of risk-weighted assets and will increase each subsequent year by an additional 0.625% until reaching its final level of 2.5% on January 1, 2019. Strict eligibility requirements for regulatory capital instruments have been implemented under the final rules and the final rules also revise the definitions and calculations of Tier 1 capital, total capital, and risk-weighted assets.

As of June 30, 2015 and December 31, 2014, the Company and WAB exceeded the capital levels necessary to be classified as well-capitalized, as defined by the federal banking agencies. The actual capital amounts and ratios for the Company and WAB are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
June 30, 2015
WAL	$	1,522,991	$	1,269,033	$	12,435,603	$	12,733,458	12.2	%	10.2	%	10.0	%	9.1	%
WAB	1,408,273		1,142,684		12,326,696		12,549,292		11.4		9.3		9.1		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

XML

Regulatory Capital Requirements (Tables)

6 Months Ended

Jun. 30, 2015

Banking and Thrift [Abstract]

Summary of Actual Capital Amount and Ratio

The actual capital amounts and ratios for the Company and WAB are presented in the following tables as of the periods indicated:

	Total Capital		Tier 1 Capital		Risk-Weighted Assets		Tangible Average Assets		Total Capital Ratio		Tier 1 Capital Ratio		Tier 1 Leverage Ratio		Common Equity Tier 1
	(dollars in thousands)
Basel III
June 30, 2015
WAL	$	1,522,991	$	1,269,033	$	12,435,603	$	12,733,458	12.2	%	10.2	%	10.0	%	9.1	%
WAB	1,408,273		1,142,684		12,326,696		12,549,292		11.4		9.3		9.1		9.3
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
Basel I
December 31, 2014
WAL	$	1,119,618	$	1,007,278	$	9,555,390	$	10,367,575	11.7	%	10.5	%	9.7	%	—
WAB	1,057,253		945,687		9,435,459		10,232,297		11.2		10.0		9.2		—
Well-capitalized ratios									10.0		6.0		5.0		—
Minimum capital ratios									8.0		4.0		4.0		—

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Segments - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2015 Subsidiary
Segment Reporting Information [Line Items]
Number of wholly-owned subsidiaries	10

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

Nature of Operation

Nature of operation

WAL is a bank holding company headquartered in Phoenix, Arizona, incorporated under the laws of the state of Delaware. WAL provides a full spectrum of deposit, lending, treasury management, and online banking products and services through its wholly-owned banking subsidiary, WAB. On June 30, 2015, WAL acquired Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank. Upon acquisition, Bridge Capital Holdings merged into WAL and its principal operating subsidiary, Bridge Bank, merged into WAB. Effective as of July 1, 2015, the existing Bridge offices and the two previously existing WAB Northern California offices are operating as a combined division under the Bridge trade name.

WAB operates the following full-service banking divisions: ABA in Arizona, BON in Southern Nevada, Bridge in Northern California, FIB in Northern Nevada, and TPB in Southern California. The Company also serves business customers through a national platform of specialized financial services including AAB, Corporate Finance, Equipment Finance, Public Finance, Resort Finance, Technology Finance, Energy Infrastructure Group, and Mortgage Warehouse Lending. In addition, the Company has one non-bank subsidiary, LVSP, which holds and manages certain non-performing loans and OREO.

Basis of Presentation

Basis of presentation

The accounting and reporting policies of the Company are in accordance with GAAP and conform to practices within the financial services industry. The accounts of the Company and its consolidated subsidiaries are included in the Unaudited Consolidated Financial Statements.

Use of Estimates

Use of estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; estimated cash flows related to PCI loans; fair value determinations related to acquisitions and other assets and liabilities carried at fair value; and accounting for income taxes. Although management believes these estimates to be reasonably accurate, actual amounts may differ. In the opinion of management, all adjustments considered necessary have been reflected in the Unaudited Consolidated Financial Statements.

Principles of Consolidation

Principles of consolidation

As of June 30, 2015, WAL has ten wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with issuance of trust-preferred securities.

The Bank has the following wholly-owned subsidiaries: WAB Investments, Inc., BON Investments, Inc., and TPB Investments, Inc., which hold certain investment securities, municipal loans, and leases; BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities; Western Alliance Equipment Finance, which offers equipment finance services nationwide. BW Nevada Holdings, LLC was dissolved on June 12, 2015 after contributing the Company’s 2700 West Sahara Avenue, Las Vegas, Nevada office building to WAB.

The Company does not have any other significant entities that should be considered for consolidation. All significant intercompany balances and transactions have been eliminated in consolidation.

Reclassifications

Reclassifications

Certain amounts in the Consolidated Financial Statements as of December 31, 2014 and for the three and six months ended June 30, 2014 may have been reclassified to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

Interim Financial Information [Text Block]

Interim financial information

The accompanying Unaudited Consolidated Financial Statements as of and for the three and six months ended June 30, 2015 and 2014 have been prepared in condensed format and, therefore, do not include all of the information and footnotes required by GAAP for complete financial statements. These statements have been prepared on a basis that is substantially consistent with the accounting principles applied to the Company's audited Consolidated Financial Statements included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014.

The information furnished in these interim statements reflects all adjustments which are, in the opinion of management, necessary for a fair statement of the results for each respective period presented. Such adjustments are of a normal, recurring nature. The results of operations in the interim statements are not necessarily indicative of the results that may be expected for any other quarter or for the full year. The interim financial information should be read in conjunction with the Company's audited Consolidated Financial Statements.

Business Combinations

Business combinations

Business combinations are accounted for under the acquisition method of accounting in accordance with ASC 805, Business Combinations. Under the acquisition method, the acquiring entity in a business combination recognizes all of the acquired assets and assumed liabilities at their estimated fair values as of the date of acquisition. Any excess of the purchase price over the fair value of net assets and other identifiable intangible assets acquired is recorded as goodwill. To the extent the fair value of net assets acquired, including identified intangible assets, exceeds the purchase price, a bargain purchase gain is recognized. Assets acquired and liabilities assumed from contingencies are also recognized at fair value if the fair value can be determined during the measurement period. Results of operations of an acquired business are included in the Consolidated Income Statement from the date of acquisition. Acquisition-related costs, including conversion and restructuring charges, are expensed as incurred.

Investment Securities

Investment securities

Investment securities may be classified as HTM, AFS, or trading. The appropriate classification is initially decided at the time of purchase. Securities classified as HTM are those debt securities that the Company has both the intent and ability to hold to maturity regardless of changes in market conditions, liquidity needs or general economic conditions. These securities are carried at amortized cost. The sale of a security within three months of its maturity date or after the majority of the principal outstanding has been collected is considered a maturity for purposes of classification and disclosure.

Securities classified as AFS or trading are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS securities are sold, the unrealized gain or loss is reclassified from OCI to non-interest income. The changes in the fair values of trading securities are reported in non-interest income. Securities classified as AFS are both equity and debt securities that the Company intends to hold for an indefinite period of time, but not necessarily to maturity. Any decision to sell a security classified as AFS would be based on various factors, including significant movements in interest rates, changes in the maturity mix of the Company’s assets and liabilities, liquidity needs, decline in credit quality, and regulatory capital considerations.

Interest income is recognized based on the coupon rate and increased by accretion of discounts earned or decreased by the amortization of premiums paid over the contractual life of the security, adjusted for prepayment estimates, using the interest method.

In estimating whether there are any OTTI losses, management considers the 1) length of time and the extent to which the fair value has been less than amortized cost; 2) financial condition and near term prospects of the issuer; 3) impact of changes in market interest rates; and 4) intent and ability of the Company to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value and whether it is not more likely than not the Company would be required to sell the security.

Declines in the fair value of individual AFS debt securities that are deemed to be other-than-temporary are reflected in earnings when identified. The fair value of the debt security then becomes the new cost basis. For individual debt securities where the Company does not intend to sell the security and it is not more likely than not that the Company will be required to sell the security before recovery of its amortized cost basis, the other-than-temporary decline in fair value of the debt security related to 1) credit loss is recognized in earnings; and 2) interest rate, market, or other factors is recognized in other comprehensive income or loss.

For individual debt securities where the Company either intends to sell the security or more likely than not will not recover all of its amortized cost, the OTTI is recognized in earnings equal to the entire difference between the security's cost basis and its fair value at the balance sheet date. For individual debt securities for which a credit loss has been recognized in earnings, interest accruals and amortization and accretion of premiums and discounts are suspended when the credit loss is recognized. Interest received after accruals have been suspended is recognized on a cash basis.

Restricted Stock

Restricted stock

On January 30, 2015, WAB became a member of the Federal Reserve System and, as part of its membership, is required to maintain stock in the FRB in a specified ratio to its capital. In addition, WAB is a member of the FHLB system and, accordingly, maintains an investment in capital stock of the FHLB based on the borrowing capacity used. The Company also maintains an investment in its primary correspondent bank. All of these investments are considered equity securities with no actively traded market. Therefore, the shares are considered restricted investment securities. These investments are carried at cost, which is equal to the value at which they may be redeemed. The dividend income received from the stock is reported in interest income. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists.

Loans, Interest and Fees from Loans

Loans, held for investment

The Company generally holds loans for investment and has the intent and ability to hold loans until their maturity. Therefore, they are reported at book value. Net loans are stated at the amount of unpaid principal, reduced by net deferred fees and costs, and an allowance for credit losses. In addition, the book value of loans that are subject to a fair value hedge is adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk. Purchased loans are recorded at estimated fair value on the date of purchase, comprised of unpaid principal less estimated credit losses and interest rate fair value adjustments.

The Company may acquire loans through a business combination or in a purchase for which differences may exist between the contractual cash flows and the cash flows expected to be collected, which are due, at least in part, to credit quality. Loans are evaluated individually to determine if there has been credit deterioration since origination. Such loans may then be aggregated and accounted for as a pool of loans based on common characteristics. When the Company acquires such loans, the yield that may be accreted (accretable yield) is limited to the excess of the Company’s estimate of undiscounted cash flows expected to be collected over the Company’s initial investment in the loan. The excess of contractual cash flows over the cash flows expected to be collected may not be recognized as an adjustment to yield, loss, or a valuation allowance. Subsequent increases in cash flows expected to be collected generally are recognized prospectively through adjustment of the loan’s yield over the remaining life. Subsequent decreases to cash flows expected to be collected are recognized as impairment. The Company may not carry over or create a valuation allowance in the initial accounting for loans acquired under these circumstances. For additional information, see "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

For purchased loans that are not deemed impaired, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. Loan fees collected for the origination of loans less direct loan origination costs (net deferred loan fees) are amortized over the contractual life of the loan through interest income. If the loan has scheduled payments, the amortization of the net deferred loan fee is calculated using the interest method over the contractual life of the loan. If the loan does not have scheduled payments, such as a line of credit, the net deferred loan fee is recognized as interest income on a straight-line basis over the contractual life of the loan commitment. Commitment fees based on a percentage of a customer’s unused line of credit and fees related to standby letters of credit are recognized over the commitment period.

When loans are repaid, any remaining unamortized balances of premiums, discounts, or net deferred fees are recognized as interest income.

Non-accrual loans: For all loan types except credit cards, when a borrower discontinues making payments as contractually required by the note, the Company must determine whether it is appropriate to continue to accrue interest. The Company ceases accruing interest income when the loan has become delinquent by more than 90 days or when management determines that the full repayment of principal and collection of interest according to contractual terms is no longer likely. The Company may decide to continue to accrue interest on certain loans more than 90 days delinquent if the loans are well secured by collateral and in the process of collection. Credit card loans and other personal loans are typically charged off no later than 180 days delinquent.

For all loan types, when a loan is placed on non-accrual status, all interest accrued but uncollected is reversed against interest income in the period in which the status is changed and, the Company makes a loan-level decision to apply either the cash basis or cost recovery method. The Company recognizes income on a cash basis only for those non-accrual loans for which the collection of the remaining principal balance is not in doubt. Under the cost recovery method, subsequent payments received from the customer are applied to principal and generally no further interest income is recognized until the principal has been paid in full or until circumstances have changed such that payments are again consistently received as contractually required.

Impaired loans: A loan is identified as impaired when it is no longer probable that interest and principal will be collected according to the contractual terms of the original loan agreement. Generally, impaired loans are classified as non-accrual. However, in certain instances, impaired loans may continue on an accrual basis, if full repayment of all principal and interest is expected and the loan is both well secured and in the process of collection. Impaired loans are measured for reserve requirements in accordance with ASC 310, Receivables, based on the present value of expected future cash flows discounted at the loan's effective interest rate or, as a practical expedient, at the loan's observable market price or the fair value of the collateral less applicable disposition costs if the loan is collateral dependent. The amount of an impairment reserve, if any, and any subsequent changes are recorded as a provision for credit losses. Losses are recorded as a charge-off when losses are confirmed. In addition to management's internal loan review process, regulators may from time to time direct the Company to modify loan grades, loan impairment calculations or loan impairment methodology.

Troubled Debt Restructured Loans: A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. A TDR loan is also considered impaired. A TDR loan may be returned to accrual status when the loan is brought current, has performed in accordance with the contractual restructured terms for a reasonable period of time (generally six months) and the ultimate collectability of the total contractual restructured principal and interest is no longer in doubt. However, such loans continue to be considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

Allowance for Credit Losses

Allowance for credit losses

Credit risk is inherent in the business of extending loans and leases to borrowers, for which the Company must maintain an adequate allowance for credit losses. The allowance for credit losses is established through a provision for credit losses recorded to expense. Loans are charged against the allowance for credit losses when management believes that the contractual principal or interest will not be collected. Subsequent recoveries, if any, are credited to the allowance. The allowance is an amount believed adequate to absorb estimated probable losses on existing loans that may become uncollectable, based on evaluation of the collectability of loans and prior credit loss experience, together with other factors. The Company formally re-evaluates and establishes the appropriate level of the allowance for credit losses on a quarterly basis.

The Company’s allowance for credit loss methodology incorporates several quantitative and qualitative risk factors used to establish the appropriate allowance for credit losses at each reporting date. Quantitative factors include: 1) the Company's historical loss experience; 2) levels of and trends in delinquencies and impaired loans; 3) levels of and trends in charge-offs and recoveries; 4) trends in volume and terms of loans; 5) changes in underwriting standards or lending policies; 6) experience, ability, depth of lending staff; 7) national and local economic trends and conditions; 8) changes in credit concentrations; 9) out-of-market exposures; 10) changes in quality of loan review system; and 11) changes in the value of underlying collateral.

An internal ten-year loss history is also incorporated into the allowance calculation model. Due to the credit concentration of our loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Nevada, Arizona, and California. While management uses the best information available to make its evaluation, future adjustments to the allowance may be necessary if there are significant changes in economic or other conditions. In addition, regulators, as an integral part of their examination processes, periodically review the Bank's allowance for credit losses, and may require us to make additions to the allowance based on their judgment about information available to them at the time of their examination. Management regularly reviews the assumptions and formulae used in determining the allowance and makes adjustments if required to reflect the current risk profile of the portfolio.

The allowance consists of specific and general components. The specific allowance applies to impaired loans. For impaired collateral dependent loans, the reserve is calculated based on the collateral value, net of estimated disposition costs. Generally, the Company obtains independent collateral valuation analysis for each loan every twelve months. Loans not collateral dependent are evaluated based on the expected future cash flows discounted at the original contractual interest rate. The Company's impairment analysis also incorporates various valuation considerations, including loan type, loss experience, and geographic criteria.

The general allowance covers all non-impaired loans and is based on historical loss experience adjusted for the various qualitative and quantitative factors listed above.

Other Assets Acquired Through Foreclosure

Other assets acquired through foreclosure

Other assets acquired through foreclosure consist primarily of properties acquired as a result of, or in-lieu-of, foreclosure. Properties or other assets (primarily repossessed assets formerly leased) are classified as OREO and other repossessed property and are initially reported at fair value of the asset less estimated selling costs. Subsequent adjustments are based on the lower of carrying value or fair value less estimated costs to sell the property. Costs related to the development or improvement of the assets are capitalized and costs related to holding the assets are charged to non-interest expense. Property is evaluated regularly to ensure the recorded amount is supported by its current fair value and valuation allowances.

Derivative Financial Instruments

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to 1) the fair value of certain fixed-rate financial instruments (fair value hedges) and 2) certain cash flows related to future interest payments on variable rate financial instruments (cash flow hedges).

The Company recognizes derivatives as assets or liabilities in the Consolidated Balance Sheet at their fair value in accordance with ASC 815, Derivatives and Hedging. The accounting for changes in the fair value of a derivative instrument depends on whether it has been designated and qualifies as part of a hedging relationship and further, on the type of hedging relationship. On the date the derivative contract is entered into, the Company designates the derivative as a fair value hedge or cash flow hedge. Derivative instruments designated in a hedge relationship to mitigate exposure to changes in the fair value of an asset or liability attributable to a particular risk, such as interest rate risk, are considered fair value hedges. Derivative instruments designated in a hedge relationship to mitigate exposure to variability in expected future cash flows, or other types of forecasted transactions, are considered cash flow hedges.

Changes in the fair value of a derivative that is designated and qualifies as a fair value hedge, along with changes in the fair value of the hedged asset or liability that are attributable to the hedged risk are recorded in current-period earnings. For a cash flow hedge, the effective portion of the change in the fair value of the derivative is recorded in AOCI and reclassified into earnings in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a cash flow hedge is recognized immediately in non-interest income in the Consolidated Income Statement. Under both the fair value and cash flow hedge scenarios, changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value or the expected cash flows of the hedged item are recognized in earnings as non-interest income during the period of the change.

The Company documents its hedge relationships, including identification of the hedging instruments and the hedged items, as well as its risk management objectives and strategies for undertaking the hedge transaction at the time the derivative contract is executed. Both at inception and at least quarterly thereafter, the Company assesses whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in either the fair value or cash flows of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. The Company discontinues hedge accounting prospectively when it is determined that a hedge is no longer highly effective. When hedge accounting is discontinued on a fair value hedge that no longer qualifies as an effective hedge, the derivative continues to be reported at fair value in the Consolidated Balance Sheet, but the carrying amount of the hedged item is no longer adjusted for future changes in fair value. The adjustment to the carrying amount of the hedged item that existed at the date hedge accounting is discontinued is amortized over the remaining life of the hedged item into earnings.

Derivative instruments that are not designated as hedges, so called free-standing derivatives, are reported in the Consolidated Balance Sheet at fair value and the changes in fair value are recognized in earnings as non-interest income during the period of change.

The Company may in the normal course of business purchase a financial instrument or originate a loan that contains an embedded derivative instrument. Upon purchasing the instrument or originating the loan, the Company assesses whether the economic characteristics of the embedded derivative are clearly and closely related to the economic characteristics of the remaining component of the financial instrument (i.e., the host contract) and whether a separate instrument with the same terms as the embedded instrument would meet the definition of a derivative instrument. When it is determined that 1) the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and 2) a separate instrument with the same terms would qualify as a derivative instrument, the embedded derivative is separated from the host contract and carried at fair value. However, in cases where 1) the host contract is measured at fair value, with changes in fair value reported in current earnings, or 2) the Company is unable to reliably identify and measure an embedded derivative for separation from its host contract, the entire contract is carried in the Consolidated Balance Sheet at fair value and is not designated as a hedging instrument.

Income Taxes

Income taxes

The Company is subject to income taxes in the United States and files a consolidated federal income tax return with all of its subsidiaries, with the exception of BW Real Estate, Inc. Deferred income taxes are recorded to reflect the effects of temporary differences between the financial reporting carrying amounts of assets and liabilities and their income tax bases using enacted tax rates that are expected to be in effect when the taxes are actually paid or recovered.As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

Net deferred tax assets are recorded to the extent that these assets will more-likely-than-not be realized. In making these determinations, all available positive and negative evidence, including scheduled reversals of deferred tax liabilities, tax planning strategies, projected future taxable income, and recent operating results. If it is determined that deferred income tax assets to be realized in the future are in excess of their net recorded amount, an adjustment to the valuation allowance will be recorded, which will reduce the Company's provision for income taxes.

A tax benefit from an unrecognized tax benefit may be recognized when it is more-likely-than-not that the position will be sustained upon examination, including related appeals or litigation, based on technical merits. Income tax benefits must meet a more-likely-than-not recognition threshold at the effective date to be recognized.

Interest and penalties related to unrecognized tax benefits are recognized as part of the provision for income taxes in the Consolidated Income Statement. Accrued interest and penalties are included in other liabilities in the Consolidated Balance Sheet.

Off-Balance Sheet Instruments

Off-balance sheet instruments

In the ordinary course of business, the Company has entered into off-balance sheet financial instrument arrangements consisting of commitments to extend credit and standby letters of credit. Such financial instruments are recorded in the Consolidated Financial Statements when they are funded. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheet. Losses would be experienced when the Company is contractually obligated to make a payment under these instruments and must seek repayment from the borrower, which may not be as financially sound in the current period as they were when the commitment was originally made. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

As with outstanding loans, the Company applies qualitative factors and utilization rates to its off-balance sheet obligations in determining an estimate of losses inherent in these contractual obligations. The estimate for credit losses on off-balance sheet instruments is included in other liabilities and the charge to income that establishes this liability is included in non-interest expense.

Fair Values of Financial Instruments

Fair values of financial instruments

The Company uses fair value measurements to record fair value adjustments to certain assets and liabilities. ASC 820, Fair Value Measurement, establishes a framework for measuring fair value and a three-level valuation hierarchy for disclosure of fair value measurement as well as enhances disclosure requirements for fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The Company uses various valuation approaches, including market, income and/or cost approaches. ASC 820 establishes a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability developed based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the factors market participants would consider in pricing the asset or liability developed based on the best information available in the circumstances. The hierarchy is broken down into three levels based on the reliability of inputs, as follows:

• Level 1 - Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

• Level 2 - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (such as interest rates, prepayment speeds, volatilities, etc.) or model-based valuation techniques where all significant assumptions are observable, either directly or indirectly, in the market.

• Level 3 - Valuation is generated from model-based techniques where one or more significant inputs are not observable, either directly or indirectly, in the market. These unobservable assumptions reflect the Company’s own estimates of assumptions that market participants would use in pricing the asset or liability. Valuation techniques may include use of matrix pricing, discounted cash flow models, and similar techniques.

The availability of observable inputs varies based on the nature of the specific financial instrument. To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for disclosure purposes, the level in the fair value hierarchy within which the fair value measurement in its entirety falls is determined based on the lowest level input that is significant to the fair value measurement in its entirety.

Fair value is a market-based measure considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measure. When market assumptions are available, ASC 820 requires the Company to make assumptions regarding the assumptions that market participants would use to estimate the fair value of the financial instrument at the measurement date.

ASC 825, Financial Instruments, requires disclosure of fair value information about financial instruments, whether or not recognized in the balance sheet, for which it is practicable to estimate that value.

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent limitations in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates presented herein are not necessarily indicative of the amounts the Company could have realized in a sales transaction at June 30, 2015 and December 31, 2014. The estimated fair value amounts for June 30, 2015 and December 31, 2014 have been measured as of period-end, and have not been reevaluated or updated for purposes of these Consolidated Financial Statements subsequent to those dates. As such, the estimated fair values of these financial instruments subsequent to the reporting date may be different than the amounts reported at period-end.

The information in "Note 14. Fair Value Accounting" in these Notes to Unaudited Consolidated Financial Statements should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only required for a limited portion of the Company’s assets and liabilities.

Due to the wide range of valuation techniques and the degree of subjectivity used in making the estimate, comparisons between the Company’s disclosures and those of other companies or banks may not be meaningful.

The following methods and assumptions were used by the Company in estimating the fair value of its financial instruments:

Cash and cash equivalents

The carrying amounts reported in the Consolidated Balance Sheets for cash and due from banks approximate their fair value.

Money market investments

The carrying amounts reported in the Consolidated Balance Sheets for money market investments approximate their fair value.

Investment securities

The fair values of CRA investments, mutual funds, and exchange-listed preferred stock are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of other investment securities were determined based on matrix pricing. Matrix pricing is a mathematical technique that utilizes observable market inputs including, for example, yield curves, credit ratings, and prepayment speeds. Fair values determined using matrix pricing are generally categorized as Level 2 in the fair value hierarchy.

The Company owns certain CDOs for which quoted prices are not available. Quoted prices for similar assets are also not available for these investment securities. In order to determine the fair value of these securities, the Company engages a third party to estimate the future cash flows and discount rate using third party quotes adjusted based on assumptions a market participant would assume necessary for each specific security. As a result of the lack of an active market, the resulting fair values have been categorized as Level 3 in the fair value hierarchy.

Restricted stock

WAB is a member of the Federal Reserve System and the FHLB and, accordingly, maintains investments in the capital stock of the FRB and the FHLB. WAB also maintains an investment in its primary correspondent bank. These investments are carried at cost since no ready market exists for them, and they have no quoted market value. The Company conducts a periodic review and evaluation of its restricted stock to determine if any impairment exists. The fair values of these investments have been categorized as Level 2 in the fair value hierarchy.

Loans

The fair value of loans is estimated based on discounted cash flows using interest rates currently being offered for loans with similar terms to borrowers with similar credit quality and adjustments that the Company believes a market participant would consider in determining fair value based on a third party independent valuation. As a result, the fair value for certain loans is categorized as Level 2 in the fair value hierarchy, excluding impaired loans which are categorized as Level 3.

Accrued interest receivable and payable

The carrying amounts reported in the Consolidated Balance Sheets for accrued interest receivable and payable approximate their fair value.

Derivative financial instruments

All derivatives are recognized in the Consolidated Balance Sheets at their fair value. The fair value for derivatives is determined based on market prices, broker-dealer quotations on similar products, or other related input parameters. As a result, the fair values have been categorized as Level 2 in the fair value hierarchy.

Deposits

The fair value disclosed for demand and savings deposits is by definition equal to the amount payable on demand at their reporting date (that is, their carrying amount), which the Company believes a market participant would consider in determining fair value. The carrying amount for variable-rate deposit accounts approximates their fair value. Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities on these deposits. The fair value measurement of the deposit liabilities is categorized as Level 2 in the fair value hierarchy.

FHLB advances, other borrowings, and subordinated debt

The fair values of the Company’s borrowings are estimated using discounted cash flow analyses, based on the market rates for similar types of borrowing arrangements. The FHLB advances have been categorized as Level 2 in the fair value hierarchy due to their short durations. Other borrowings have been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued by comparing the BB Financial over SWAP index and discounting the contractual cash flows on the Company's debt using these market rates. Junior subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Off-balance sheet instruments

The fair value of the Company’s off-balance sheet instruments (lending commitments and standby letters of credit) is based on quoted fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and the counterparties’ credit standing.

Recent Accounting Pronouncements

Recent accounting pronouncements

In June 2014, the FASB issued guidance within ASU 2014-12, Accounting for Share-Based Payments When the Terms of anAward Provide That a Performance Target Could Be Achieved after the Requisite Service Period. The amendments in ASU 2014-12 to Topic 718, Compensation - Stock Compensation, provide explicit guidance on whether to treat a performance target that could be achieved after the requisite service period as a performance condition that affects vesting or as a nonvesting condition that affects the grant-date fair value of an award. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. Early adoption is permitted. An entity may elect to apply the amendments either prospectively to all awards granted or modified after the effective date or retrospectively to all awards with performance targets that are outstanding as of the beginning of the earliest annual period presented in the financial statements and to all new or modified awards thereafter. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

In August 2014, the FASB issued guidance within ASU 2014-15, Presentation of Financial Statements - Going Concern. The amendments in ASU 2014-15 to Subtopic 205-40, Going Concern, provide guidance about management's responsibility to evaluate whether there is substantial doubt about an entity's ability to continue as a going concern. The amendments require management to assess an entity's ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards. The amendments are effective for the annual period ending after December 15, 2016, and for annual periods and interim periods thereafter. Early application is permitted. The adoption of this guidance is not expected to have a material impact on the Company’s Consolidated Financial Statements.

In February 2015, the FASB issued guidance within ASU 2015-02, Amendments to the Consolidation Analysis. The amendments in ASU 2015-02 to Topic 810, Consolidation, change the analysis that a reporting entity must perform to determine whether it should consolidate certain types of legal entities. Specifically, the amendments modify the evaluation of whether limited partnerships and similar legal entities are variable interest entities or voting interest entities, eliminate the presumption that a general partner should consolidate a limited partnership, affect the consolidation analysis of reporting entities that are involved with variable interest entities, particularly those that have fee arrangements and related party relationships, and provide a scope exception from consolidation guidance for reporting entities with interests in legal entities that are required to comply with or operate in accordance with requirements that are similar to those in Rule 2a-7 of the Investment Company Act of 1940 for registered money market funds. The amendments are effective for fiscal years, and for interim periods within those fiscal years, beginning after December 15, 2015. Early adoption is permitted. An entity may apply the amendments in this Update using a modified retrospective approach by recording a cumulative-effect adjustment to equity as of the beginning of the fiscal year of adoption or, may apply the amendments retrospectively. The adoption of this guidance is not expected to have a material impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

In the second quarter of 2015, the Company adopted the amended guidance within ASU 2015-03, Simplifying the Presentation of Debt Issuance Costs. The amendments in ASU 2015-03 to Subtopic 835-30, Interest - Imputation of Interest, require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The guidance should be applied on a retrospective basis. The recognition and measurement guidance for debt issuance costs are not affected by the amendments in this Update.

On June 29, 2015, the Company issued $150.0 million in subordinated debt. As a result of the adoption of this amended guidance, subordinated debt was recorded net of related issuance costs of $1.6 million. Prior period balances were not adjusted for the change in accounting principle as unamortized debt issuance costs are not significant.

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Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure Parenthetical (Detail) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015 USD ($) Property	Jun. 30, 2015 USD ($) Property	Jun. 30, 2014 USD ($)	Dec. 31, 2014 Property
Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]
Gains Losses On Transfers To Other Real Estate And Foreclosed Assets	$ 0	$ 600	$ 0
Number of Real Estate Properties | Property	56	56		67

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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Preferred Stock [Member]	Common Stock [Member]	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated (Deficit) [Member]	Bridge Capital Holdings [Member] Common Stock [Member]
Beginning balance at Dec. 31, 2013	$ 855,498,000	$ 141,000,000	$ 9,000	$ 797,146,000	$ (21,546,000)	$ (61,111,000)
Beginning balance, shares at Dec. 31, 2013		141,000	87,186,000
Net income	66,623,000					66,623,000
Exercise of stock options, shares			169,000
Exercise of stock options	1,996,000			1,996,000
Restricted stock grants, net, shares			303,000
Restricted stock grants, net	1,623,000			1,623,000
Stock Issued During Period, Shares, New Issues			115,866
Stock Issued During Period, Value, New Issues	2,611,000		$ 2,831,306.000	2,611,000
Dividends on preferred stock	(705,000)					(705,000)
Other comprehensive (loss) income, net	30,018,000				30,018,000
Ending balance at Jun. 30, 2014	957,664,000	$ 141,000,000	$ 9,000	803,376,000	8,472,000	4,807,000
Ending balance, shares at Jun. 30, 2014		141,000	87,774,000
Beginning balance at Dec. 31, 2014	1,000,928,000	$ 70,500,000	$ 9,000	828,327,000	16,639,000	85,453,000
Beginning balance, shares at Dec. 31, 2014		71,000	88,691,000
Net income	74,909,000					74,909,000
Exercise of stock options, shares			145,000
Exercise of stock options	1,537,000			1,537,000
Restricted stock grants, net, shares			458,000
Restricted stock grants, net	8,053,000			8,053,000
Stock Issued During Period, Shares, New Issues			0				12,997,000
Stock Issued During Period, Value, New Issues	431,031,000		$ 1,000	431,030,000
Dividends on preferred stock	(423,000)					(423,000)
Other comprehensive (loss) income, net	(1,291,000)				(1,291,000)
Ending balance at Jun. 30, 2015	$ 1,514,744,000	$ 70,500,000	$ 10,000	$ 1,268,947,000	$ 15,348,000	$ 159,939,000
Ending balance, shares at Jun. 30, 2015		71,000	102,291,000

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Amortized cost of investment securities available for sale	$ 1,453,820	$ 1,493,648
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, liquidation value	$ 1,000	$ 1,000
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares issued	70,500	141,000
Preferred stock, shares outstanding	70,500	141,000
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	102,290,865	88,691,249
Common stock, shares outstanding	102,290,865	88,691,249

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Derivatives and Hedging

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

The Company is a party to various derivative instruments through its subsidiary, WAB. Derivative instruments are contracts between two or more parties that have a notional amount and an underlying variable, require a small or no initial investment, and allow for the net settlement of positions. A derivative’s notional amount serves as the basis for the payment provision of the contract and takes the form of units, such as shares or dollars. A derivative’s underlying variable is a specified interest rate, security price, commodity price, foreign exchange rate, index, or other variable. The interaction between the notional amount and the underlying variable determines the number of units to be exchanged between the parties and influences the fair value of the derivative contract.

The primary type of derivatives that the Company uses are interest rate swaps. Generally, these instruments are used to help manage the Company's exposure to interest rate risk and meet client financing and hedging needs.

Derivatives are recorded at fair value in the Consolidated Balance Sheets, after taking into account the effects of bilateral collateral and master netting agreements. These agreements allow the Company to settle all derivative contracts held with the same counterparty on a net basis, and to offset net derivative positions with related cash collateral, where applicable.

As of June 30, 2015, December 31, 2014, and June 30, 2014, the Company does not have any significant outstanding cash flow hedges or free-standing derivatives.

Derivatives Designated in Hedge Relationships

The Company utilizes derivatives that have been designated as part of a hedge relationship in accordance with the applicable accounting guidance to minimize the exposure to changes in benchmark interest rates and volatility of net interest income and EVE to interest rate fluctuations. The primary derivative instruments used to manage interest rate risk are interest rate swaps, which convert the contractual interest rate index of agreed-upon amounts of assets and liabilities (i.e., notional amounts) to another interest rate index.

The Company designates its “pay fixed/receive variable” interest rate swaps as fair value hedges. These contracts convert certain fixed-rate long-term loan assets into variable-rate assets, thereby modifying the Company's exposure to changes in interest rates. As a result, the Company receives variable-rate interest payments in exchange for making fixed-rate payments over the lives of the contracts without exchanging the notional amounts.

During the three months ended June 30, 2015, the Company entered into a "pay variable/receive fixed" interest rate swap agreement to hedge the interest rate exposure on its subordinated debt issuance. As a result, the Company is paying a floating rate of 3 month LIBOR plus 3.16% and receiving semi-annual fixed payments of 5.00% to match the payments on the debt.

Fair Values, Volume of Activity, and Gain/Loss Information Related to Derivative Instruments

The following table summarizes the fair values of the Company's derivative instruments on a gross and net basis as of June 30, 2015, December 31, 2014, and June 30, 2014. The change in the notional amounts of these derivatives from December 31, 2014 to June 30, 2015 indicates the volume of the Company's derivative transaction activity during 2015. The derivative asset and liability balances are presented on a gross basis, prior to the application of bilateral collateral and master netting agreements. Total derivative assets and liabilities are adjusted to take into account the impact of legally enforceable master netting agreements that allow the Company to settle all derivative contracts with the same counterparty on a net basis and to offset the net derivative position with the related collateral. Where master netting agreements are not in effect or are not enforceable under bankruptcy laws, the Company does not adjust those derivative amounts with counterparties. The fair value of derivative contracts, after taking into account the effects of master netting agreements, is included in other assets or other liabilities in the Consolidated Balance Sheets, as indicated in the following table:

	June 30, 2015						December 31, 2014						June 30, 2014
			Fair Value						Fair Value						Fair Value
	Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities		Notional Amount		Derivative Assets		Derivative Liabilities
	(in thousands)
Derivatives designated as hedging instruments:
Fair value hedges
Interest rate swaps	$	828,036	$	198	$	49,037	$	647,703	$	7	$	57,820	$	568,006	$	2	$	29,129
Total	828,036		198		49,037		647,703		7		57,820		568,006		2		29,129
Netting adjustments (1)	—		—		—		—		—		—		—		2		2
Net derivatives in the balance sheet	$	828,036	$	198	$	49,037	$	647,703	$	7	$	57,820	$	568,006	$	—	$	29,127

(1) Netting adjustments represent the amounts recorded to convert our derivative balances from a gross basis to a net basis in accordance with the applicable accounting guidance.

Fair value hedges

An assessment of effectiveness is performed at both initiation of a hedge and on a quarterly basis thereafter. All of the Company's fair value hedges remained “highly effective” as of June 30, 2015, December 31, 2014, and June 30, 2014.

The following table summarizes the pre-tax net gains (losses) on fair value hedges for the three and six months ended June 30, 2015 and June 30, 2014 and where they are recorded in the income statement.

	Three Months Ended June 30,
	2015					2014
Income Statement Classification	Net Gain (Loss) on Derivatives		Increase (Decrease) to Basis of Hedged Asset/Liability (a)			Net Gain (Loss) on Derivatives			Increase (Decrease) to Basis of Hedged Asset/Liability (a)
	(in thousands)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	$	24,201	$	(24,186	)	$	(16,635	)	$	16,795
	Six Months Ended June 30,
	2015					2014
Income Statement Classification	Net Gain (Loss) on Derivatives		Increase (Decrease) to Basis of Hedged Asset/Liability (a)			Net Gain (Loss) on Derivatives			Increase (Decrease) to Basis of Hedged Asset/Liability (a)
	(in thousands)
Unrealized (losses) gains on assets and liabilities measured at fair value, net	$	8,971	$	(8,950	)	$	(31,774	)	$	31,570

(a) Net gain (loss) on loans represent the change in fair value caused by fluctuations in interest rates; differences relate to ineffectiveness associated with the fair value hedge.

Counterparty Credit Risk

Like other financial instruments, derivatives contain an element of credit risk. This risk is measured as the expected positive replacement value of the contracts. Management generally enters into bilateral collateral and master netting agreements that provide for the net settlement of all contracts with the same counterparty. Additionally, management monitors counterparty credit risk exposure on each contract to determine appropriate limits on the Company's total credit exposure across all product types. In general, the Company has a zero credit threshold with regard to derivative exposure with counterparties. Management reviews the Company's collateral positions on a daily basis and exchanges collateral with counterparties in accordance with standard ISDA documentation and other related agreements. The Company generally holds collateral in the form of highly rated securities issued by the U.S. Treasury or government-sponsored enterprises, such as GNMA, FNMA, and FHLMC. The total collateral netted against net derivative liabilities totaled $46.7 million at June 30, 2015, $57.8 million at December 31, 2014, and $29.2 million at June 30, 2014.

The following table summarizes our largest exposure to an individual counterparty at the dates indicated:

	June 30, 2015		December 31, 2014		June 30, 2014
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	198	$	7	$	2
Collateral posted by this counterparty	—		—		—
Derivative liability with this counterparty	—		—		28,874
Collateral pledged to this counterparty	—		—		28,872
Net exposure after netting adjustments and collateral	$	198	$	7	$	—

Credit Risk Contingent Features

Management has entered into certain derivative contracts that require the Company to post collateral to the counterparties when these contracts are in a net liability position. Conversely, the counterparties post collateral when these contracts are in a net asset position. The amount of collateral to be posted is based on the amount of the net liability and exposure thresholds. As of June 30, 2015, December 31, 2014, and June 30, 2014 the aggregate fair value of all derivative contracts with credit risk contingent features (i.e., those containing collateral posting provisions) held by the Company that were in a net liability position totaled $49.0 million, $57.8 million, and $29.1 million, respectively. As of June 30, 2015, the Company was in an over-collateralized net position of $18.0 million after considering $64.6 million of collateral held in the form of securities. As of December 31, 2014 and June 30, 2014, the Company was in an over-collateralized position of $14.2 million and $17.5 million, respectively.

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Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	[1]	$ 106,369	$ 124,928
Impaired loans without specific valuation allowance	[2]	44,780	41,822
Other assets acquired through foreclosure		59,300	57,100	$ 59,300
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		106,400	124,900
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		99,212	114,163
Impaired loans without specific valuation allowance	[3]	38,010	38,019
Other assets acquired through foreclosure		59,335	57,150
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		0	0
Impaired loans without specific valuation allowance	[3]	0	0
Other assets acquired through foreclosure		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		0	0
Impaired loans without specific valuation allowance	[3]	0	0
Other assets acquired through foreclosure		0	0
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded		99,212	114,163
Impaired loans without specific valuation allowance	[3]	38,010	38,019
Other assets acquired through foreclosure		$ 59,335	$ 57,150

[1] Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

[3] Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy: Fair Value Measurements at the End of the Reporting Period Using Total Quoted Prices in Active Markets for Identical Assets(Level 1) Active Markets for Similar Assets(Level 2) Unobservable Inputs(Level 3) (in thousands)As of June 30, 2015: Impaired loans with specific valuation allowance $99,212 $— $— $99,212Impaired loans without specific valuation allowance (1) 38,010 — — 38,010Other assets acquired through foreclosure 59,335 — — 59,335As of December 31, 2014: Impaired loans with specific valuation allowance $114,163 $— $— $114,163Impaired loans without specific valuation allowance (1) 38,019 — — 38,019Other assets acquired through foreclosure 57,150 — — 57,150(1)Excludes loan balances with charge-offs of $6.8 million and $3.8 million as of June 30, 2015 and December 31, 2014, respectively.

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Fair Value Accounting - Fair Value of Assets and Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2015		Dec. 31, 2014		Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 1,478,234		$ 1,520,237
Derivative Liability	49,037		57,820		$ 29,127
Derivative Asset	198		7		$ 0
Subordinated Debt Obligations, Fair Value Disclosure	48,482		40,437
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,478,234		1,520,237
Derivative Liability	49,037	[1]	57,820	[2]
Derivative Asset	198	[1]	7	[2]
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	169,899		144,646
Derivative Liability	0	[1]	0	[2]
Derivative Asset	0	[1]	0	[2]
Subordinated Debt Obligations, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,297,531		1,364,146
Derivative Liability	49,037	[1]	57,820	[2]
Derivative Asset	198	[1]	7	[2]
Subordinated Debt Obligations, Fair Value Disclosure	0		0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	10,804		11,445
Derivative Liability	0	[1]	0	[2]
Derivative Asset	0	[1]	0	[2]
Subordinated Debt Obligations, Fair Value Disclosure	48,482		40,437
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	1,701		1,858
Securities available for sale	871,357		891,189
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	0		0
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	1,701		1,858
Securities available for sale	871,357		891,189
Fair Value, Measurements, Recurring [Member] | Residential mortgage-backed securities issued by GSEs | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities measured at fair value	0		0
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	102,071		70,243
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	31,527		0
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	70,544		70,243
Fair Value, Measurements, Recurring [Member] | Private label residential mortgage-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	13,209		2,147
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	11,126		0
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	2,083		2,147
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	13,665		52,489
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	326		0
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	13,339		52,489
Fair Value, Measurements, Recurring [Member] | Corporate debt securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	292,413		299,037
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,235		0
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	291,178		299,037
Fair Value, Measurements, Recurring [Member] | Municipal obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	83,051		82,612
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	83,051		82,612
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Preferred Stock [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			37,702
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			37,702
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			0
Fair Value, Measurements, Recurring [Member] | Mutual funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale			0
Fair Value, Measurements, Recurring [Member] | CRA investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	32,537
Fair Value, Measurements, Recurring [Member] | CRA investments [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	32,537		24,332
Fair Value, Measurements, Recurring [Member] | CRA investments [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | CRA investments [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	10,804		11,445
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Collateralized debt obligations [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	10,804		11,445
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	25,648		25,546
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	25,648		25,546
Fair Value, Measurements, Recurring [Member] | Trust preferred securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,979		5,149
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	4,979		5,149
Fair Value, Measurements, Recurring [Member] | Private label commercial mortgage-backed securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		0
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	24,609		18,346
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	6,206		0
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	18,403		18,346
Fair Value, Measurements, Recurring [Member] | US Government-sponsored Enterprises Debt Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0		$ 0
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,891
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,891
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	0
Fair Value, Measurements, Recurring [Member] | US Treasury Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 0

[1] Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $48,258 as of June 30, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

[2] Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Aug. 03, 2015
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q2
Trading Symbol	WAL
Entity Registrant Name	WESTERN ALLIANCE BANCORPORATION
Entity Central Index Key	0001212545
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		102,322,933

XML

Earnings per Share (Notes)

6 Months Ended

Jun. 30, 2015

Earnings Per Share [Abstract]

Earnings Per Share

Diluted EPS is based on the weighted average outstanding common shares during each period, including common stock equivalents. Basic EPS is based on the weighted average outstanding common shares during the period.

The following table presents the calculation of basic and diluted EPS: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Weighted average shares - basic	88,177		86,501		88,059		86,379
Dilutive effect of stock awards	505		832		508		850
Weighted average shares - diluted	88,682		87,333		88,567		87,229
Net income available to common stockholders	$	34,472	$	35,186	$	74,486	$	65,918
Earnings per share - basic	0.39		0.41		0.85		0.76
Earnings per share - diluted	0.39		0.40		0.84		0.76

The Company had zero and 1,500 stock options outstanding as of June 30, 2015 and December 31, 2014, respectively, that were not included in the computation of diluted earnings per common share because their effect would be anti-dilutive.

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Derivatives and Hedging Pre-Tax Net Gains (Losses) on Fair Value Hedges (Detail) - Interest Rate Swap [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
Net Gain (Loss) on Derivatives	[1]	$ 24,201	$ (16,635)	$ 8,971	$ (31,774)
Increase (Decrease) to Basis of Hedged Assets	[1]	$ (24,186)	$ 16,795	$ (8,950)	$ 31,570

[1] Net gain (loss) on loans represent the change in fair value caused by fluctuations in interest rates; differences relate to ineffectiveness associated with the fair value hedge.

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Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (7,745)	$ 123	$ (8,059)	$ (837)
Interest Income on Securities	1	1	1	2
Interest Expense, Junior Subordinated Debentures	(451)	(443)	(892)	(864)
Interest Expense on Junior Subordinated Debt	(451)	443	(892)	864
Total Changes Included in Current-Period Earnings	(7,293)	(319)	(7,166)	(1,699)
Securities measured at fair value [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(9)	(2)	(14)	16
Interest Income on Securities	1	1	1	2
Interest Expense on Junior Subordinated Debt	0	0	0	0
Total Changes Included in Current-Period Earnings	(8)	(1)	(13)	18
Junior Subordinated Debt [Member]
Fair Value, Option, Qualitative Disclosures Related to Election [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(7,736)	125	(8,045)	(853)
Interest Income on Securities	0	0	0	0
Interest Expense, Junior Subordinated Debentures	451		892
Interest Expense on Junior Subordinated Debt		443		864
Total Changes Included in Current-Period Earnings	$ (7,285)	$ (318)	$ (7,153)	$ (1,717)

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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2012
Interest income:
Loans, including fees	$ 105,468	$ 90,583	$ 205,859	$ 177,387
Investment securities	8,003	9,926	16,516	20,153
Dividends	1,273	968	2,548	2,066
Other	1,874	496	2,657	1,068
Total interest income	116,618	101,973	227,580	200,674
Interest expense:
Deposits	5,362	4,930	10,508	9,595
Other borrowings	2,068	2,686	4,312	5,505
Qualifying debt	451	443	892	864
Customer repurchase agreements	19	16	42	35
Total interest expense	7,900	8,075	15,754	15,999
Net interest income	108,718	93,898	211,826	184,675
Provision for credit losses	0	507	700	4,007
Net interest income after provision for credit losses	108,718	93,391	211,126	180,668
Non-interest income:
Service charges and fees	3,128	2,758	6,017	5,319
Income from bank owned life insurance	772	959	1,749	1,908
Card income	899	860	1,712	1,645
Gain (Loss) on Sale of Securities, Net	55	(163)	644	203
Gains (Losses) on Extinguishment of Debt	(81)	0	(81)	0
Gain (loss) on sales of investment securities, net	(7,885)	235	(8,194)	(1,041)
Other income	921	950	1,895	2,120
Total non-interest (loss) income	(2,191)	5,599	3,742	10,154
Non-interest expense:
Salaries and employee benefits	32,406	31,751	64,947	61,306
Occupancy	4,949	4,293	9,762	8,979
Legal, professional, and directors' fees	4,611	4,192	8,606	7,831
Data processing	2,683	2,580	5,809	5,309
Insurance	2,274	2,087	4,364	4,480
Marketing	1,284	889	2,374	2,036
Card expense	613	530	1,087	1,130
Marketing Expense	463	506	840	1,065
Intangible amortization	281	302	562	899
Intangible amortization	(1,218)	184	(1,569)	(2,377)
Acquisition / restructure expense	7,842	26	8,001	183
Other expense	5,021	4,902	10,459	10,870
Total non-interest expense	61,209	52,242	115,242	101,711
Income from continuing operations before provision for income taxes	45,318	46,748	99,626	89,111
Income tax expense	10,599	10,706	24,717	21,330
Income from continuing operations	34,719	36,042	74,909	67,781
Loss from discontinued operations, net of tax	0	(504)	0	(1,158)
Net income	34,719	35,538	74,909	66,623
Dividends on preferred stock	247	352	423	705
Net income available to common stockholders	$ 34,472	$ 35,186	$ 74,486	$ 65,918
Earnings per share from continuing operations:
Basic	$ 0.39	$ 0.41		$ 0.78	$ 0.85
Diluted	0.39	0.41		0.77	0.84
Loss per share from discontinued operations:
Basic	0.00	0.00		(0.02)	0.00
Diluted	0.00	(0.01)		(0.01)	0.00
Earnings per share available to common stockholders:
Basic	0.39	0.41	$ 0.85	0.76	0.85
Diluted	$ 0.39	$ 0.40	$ 0.84	$ 0.76	$ 0.84
Weighted average number of common shares outstanding:
Basic	88,177	86,501	88,059	86,379	88,059
Diluted	88,682	87,333	88,567	87,229	88,567
Dividends declared per common share	$ 0.00	$ 0.00		$ 0.00	$ 0.00

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Loans, Leases and Allowance for Credit Losses

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Loans, Leases and Allowance for Credit Losses

The composition of the Company’s loan portfolio is as follows: 

	June 30, 2015			December 31, 2014
	(in thousands)
Loans, held for investment
Commercial and industrial	$	4,576,303		$	3,326,708
Commercial real estate - non-owner occupied	2,195,018			2,052,566
Commercial real estate - owner occupied	2,019,280			1,732,888
Construction and land development	1,002,698			748,053
Residential real estate	320,591			299,402
Commercial leases	183,378			205,639
Consumer	23,953			33,009
Loans, net of deferred loan fees and costs	10,321,221			8,398,265
Allowance for credit losses	(115,056		)	(110,216		)
Total loans HFI	$	10,206,165		$	8,288,049

Net deferred loan fees and costs as of June 30, 2015 and December 31, 2014 total $14.0 million and $12.5 million, respectively. Net unamortized discounts on loans total $8.1 million and $7.5 million as of June 30, 2015 and December 31, 2014, respectively.

As of June 30, 2015, the Company also has $39.4 million of HFS loans.

The following table presents the contractual aging of the recorded investment in past due loans held for investment by class of loans:

	June 30, 2015
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,018,462	$	343	$	—	$	475	$	818	$	2,019,280
Non-owner occupied	2,000,579		181		—		3,626		3,807		2,004,386
Multi-family	190,207		—		—		425		425		190,632
Commercial and industrial
Commercial	4,566,978		1,692		1,239		6,394		9,325		4,576,303
Leases	183,378		—		—		—		—		183,378
Construction and land development
Construction	597,059		—		—		—		—		597,059
Land	404,356		—		—		1,283		1,283		405,639
Residential real estate	310,628		169		151		9,643		9,963		320,591
Consumer	23,515		13		219		206		438		23,953
Total loans	$	10,295,162	$	2,398	$	1,609	$	22,052	$	26,059	$	10,321,221

	December 31, 2014
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,730,164	$	1,406	$	180	$	1,138	$	2,724	$	1,732,888
Non-owner occupied	1,855,454		2,389		3,361		8,737		14,487		1,869,941
Multi-family	182,180		—		445		—		445		182,625
Commercial and industrial
Commercial	3,324,132		1,523		15		1,038		2,576		3,326,708
Leases	205,639		—		—		—		—		205,639
Construction and land development
Construction	388,399		—		—		—		—		388,399
Land	356,209		—		2,640		805		3,445		359,654
Residential real estate	292,065		2,347		205		4,785		7,337		299,402
Consumer	32,540		177		21		271		469		33,009
Total loans	$	8,366,782	$	7,842	$	6,867	$	16,774	$	31,483	$	8,398,265

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing interest by class of loans: 

	June 30, 2015								December 31, 2014
	Non-accrual loans						Loans past due 90 days or more and still accruing		Non-accrual loans						Loans past due 90 days or more and still accruing
	Current		Past Due/ Delinquent		Total Non-accrual				Current		Past Due/ Delinquent		Total Non-accrual
	(in thousands)
Commercial real estate
Owner occupied	$	10,090	$	—	$	10,090	$	474	$	13,630	$	—	$	13,630	$	1,138
Non-owner occupied	26,756		2,769		29,525		858		30,226		8,601		38,827		2,171
Multi-family	—		—		—		425		—		—		—		—
Commercial and industrial
Commercial	809		2,241		3,050		4,153		2,621		496		3,117		703
Leases	3,930		—		3,930		—		373		—		373		—
Construction and land development
Construction	—		—		—		—		—		—		—		—
Land	2,516		—		2,516		1,283		2,686		2,640		5,326		805
Residential real estate	1,556		8,561		10,117		1,082		1,332		4,841		6,173		232
Consumer	—		197		197		9		25		188		213		83
Total	$	45,657	$	13,768	$	59,425	$	8,284	$	50,893	$	16,766	$	67,659	$	5,132

The reduction in interest income associated with loans on non-accrual status was approximately $0.7 million and $0.8 million for the three months ended June 30, 2015 and 2014, respectively, and $1.4 million and $1.8 million for the six months ended June 30, 2015 and 2014, respectively.

The Company utilizes an internal asset classification system as a means of reporting problem and potential problem loans. Under the Company’s risk rating system, the Company classifies problem and potential problem loans as Special Mention, Substandard, Doubtful, and Loss. Substandard loans include those characterized by well-defined weaknesses and carry the distinct possibility that the Company will sustain some loss if the deficiencies are not corrected. Loans classified as Doubtful, or risk rated eight, have all the weaknesses inherent in those classified as Substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, conditions and values, highly questionable and improbable. The final rating of Loss covers loans considered uncollectible and having such little recoverable value that it is not practical to defer writing off the asset. Loans that do not currently expose the Company to sufficient risk to warrant classification in one of the aforementioned categories, but possess weaknesses that deserve management’s close attention, are deemed to be Special Mention. Risk ratings are updated, at a minimum, quarterly.

The following tables present gross loans by risk rating: 

	June 30, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,957,152	$	33,347	$	28,071	$	710	$	—	$	2,019,280
Non-owner occupied	1,932,983		20,676		50,727		—		—		2,004,386
Multi-family	188,894		—		1,738		—		—		190,632
Commercial and industrial
Commercial	4,473,382		66,656		36,265		—		—		4,576,303
Leases	173,634		5,793		3,951		—		—		183,378
Construction and land development
Construction	594,752		2,307		—		—		—		597,059
Land	385,659		374		19,606		—		—		405,639
Residential real estate	299,941		2,288		18,362		—		—		320,591
Consumer	23,318		377		258		—		—		23,953
Total	$	10,029,715	$	131,818	$	158,978	$	710	$	—	$	10,321,221

	June 30, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	10,027,949	$	129,876	$	136,627	$	710	$	—	$	10,295,162
Past due 30 - 59 days	1,330		769		299		—		—		2,398
Past due 60 - 89 days	436		1,173		—		—		—		1,609
Past due 90 days or more	—		—		22,052		—		—		22,052
Total	$	10,029,715	$	131,818	$	158,978	$	710	$	—	$	10,321,221

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,664,270	$	28,072	$	39,222	$	1,324	$	—	$	1,732,888
Non-owner occupied	1,771,138		35,752		62,611		440		—		1,869,941
Multi-family	182,180		—		445		—		—		182,625
Commercial and industrial
Commercial	3,295,027		14,380		17,146		155		—		3,326,708
Leases	202,772		2,494		373		—		—		205,639
Construction and land development
Construction	383,677		4,241		481		—		—		388,399
Land	328,278		10,289		21,087		—		—		359,654
Residential real estate	284,052		2,044		13,306		—		—		299,402
Consumer	32,419		233		357		—		—		33,009
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	8,140,140	$	95,091	$	129,787	$	1,764	$	—	$	8,366,782
Past due 30 - 59 days	2,771		198		4,718		155		—		7,842
Past due 60 - 89 days	385		37		6,445		—		—		6,867
Past due 90 days or more	517		2,179		14,078		—		—		16,774
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

The table below reflects the recorded investment in loans classified as impaired: 

	June 30, 2015			December 31, 2014
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	106,369		$	124,928
Impaired loans without a specific valuation allowance under ASC 310 (2)	44,780			41,822
Total impaired loans	$	151,149		$	166,750
Valuation allowance related to impaired loans (3)	$	(7,157	)	$	(10,765	)

(1) Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

(2) Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

(3) Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

The following table presents impaired loans by class: 

	June 30, 2015		December 31, 2014
	(in thousands)
Commercial real estate
Owner occupied	$	34,336	$	44,893
Non-owner occupied	59,025		66,324
Multi-family	—		—
Commercial and industrial
Commercial	11,806		13,749
Leases	3,930		373
Construction and land development
Construction	—		—
Land	19,117		21,748
Residential real estate	22,611		19,300
Consumer	324		363
Total	$	151,149	$	166,750

A valuation allowance is established for an impaired loan when the fair value of the loan is less than the recorded investment. In certain cases, portions of impaired loans are charged-off to realizable value instead of establishing a valuation allowance and are included, when applicable in the table above as “Impaired loans without a specific valuation allowance under ASC 310.” However, before concluding that an impaired loan needs no associated valuation allowance, an assessment is made to consider all available and relevant information for the method used to evaluate impairment and the type of loan being assessed. The valuation allowance disclosed above is included in the allowance for credit losses reported in the Consolidated Balance Sheets as of June 30, 2015 and December 31, 2014.

The following table presents the average investment in impaired loans and income recognized on impaired loans: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Average balance on impaired loans	$	155,943	$	167,326	$	159,186	$	170,010
Interest income recognized on impaired loans	1,126		1,435		2,310		2,821
Interest recognized on non-accrual loans, cash basis	548		566		1,201		1,172

The following table presents average investment in impaired loans by loan class: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	38,750	$	34,341	$	40,839	$	35,545
Non-owner occupied	59,873		68,725		62,636		69,382
Multi-family	—		—		—		—
Commercial and industrial
Commercial	12,401		15,438		12,835		15,510
Leases	4,879		419		2,618		429
Construction and land development
Construction	—		—		—		—
Land	19,834		20,291		20,523		21,438
Residential real estate	19,838		27,607		19,375		27,203
Consumer	368		505		360		503
Total	$	155,943	$	167,326	$	159,186	$	170,010

The average investment in TDR loans included in the average investment in impaired loans table above for the three months ended June 30, 2015 and 2014 was $121.2 million and $123.6 million, respectively, and $123.6 million and $126.6 million for the six months ended June 30, 2015 and 2014, respectively.

The following table presents interest income on impaired loans by class: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	406	$	374	$	827	$	765
Non-owner occupied	360		402		690		775
Multi-family	—		—		—		—
Commercial and industrial
Commercial	60		184		139		377
Leases	—		—		—		—
Construction and land development
Construction	—		—		—		—
Land	197		295		392		556
Residential real estate	102		160		259		317
Consumer	1		20		3		31
Total	$	1,126	$	1,435	$	2,310	$	2,821

The Company is not committed to lend significant additional funds on these impaired loans.

The following table summarizes nonperforming assets: 

	June 30, 2015		December 31, 2014
	(in thousands)
Non-accrual loans (1)	$	59,425	$	67,659
Loans past due 90 days or more on accrual status	8,284		5,132
Troubled debt restructured loans (2)	80,192		84,720
Total nonperforming loans	147,901		157,511
Other assets acquired through foreclosure, net	59,335		57,150
Total nonperforming assets	$	207,236	$	214,661

(1) Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

(2) Includes accruing TDR loans only.

Loans Acquired in Bridge Acquisition

The following table presents information regarding the contractually required principal payments receivable, cash flows expected to be collected, and the preliminary estimated fair value of loans acquired in the Bridge acquisition, as of June 30, 2015, the closing date of the transaction:

	June 30, 2015
	Commercial and Industrial		Commercial Real Estate		Construction and Land Development		Residential Real Estate		Consumer		Total
	(in thousands)
Contractually required principal payments:
Loans with credit deterioration since origination	$	10,229	$	1,625	$	—	$	2,455	$	—	$	14,309
Purchased non-credit impaired loans	1,098,965		235,206		99,025		23,797		938		1,457,931
Total loans acquired	1,109,194		236,831		99,025		26,252		938		1,472,240
Cash flows expected to be collected:
Loans with credit deterioration since origination	9,613		1,496		—		2,087		—		13,196
Purchased non-credit impaired loans	1,170,869		302,186		102,018		26,865		1,169		1,603,107
Total loans acquired	1,180,482		303,682		102,018		28,952		1,169		1,616,303
Fair value of loans acquired:
Loans with credit deterioration since origination	8,619		1,480		—		2,075		—		12,174
Purchased non-credit impaired loans	1,082,413		229,470		99,078		23,069		931		1,434,961
Total loans acquired	$	1,091,032	$	230,950	$	99,078	$	25,144	$	931	$	1,447,135

Loans Acquired with Deteriorated Credit Quality

Changes in the accretable yield for loans acquired with deteriorated credit quality in the Centennial, Western Liberty, and Bridge acquisitions are as follows: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Balance, at beginning of period	$	17,956		$	26,831		$	19,156		$	28,164
Additions due to acquisition of Bridge	857			—			857			—
Reclassifications from non-accretable to accretable yield (1)	265			1,564			695			3,030
Accretion to interest income	(1,012		)	(1,798		)	(2,090		)	(4,202		)
Reversal of fair value adjustments upon disposition of loans	(876		)	(3,414		)	(1,428		)	(3,809		)
Balance, at end of period	$	17,190		$	23,183		$	17,190		$	23,183

(1) The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

Allowance for Credit Losses

The following table summarizes the changes in the allowance for credit losses by portfolio type: 

	Three Months Ended June 30,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	17,999		$	28,111		$	6,666		$	58,651		$	671		$	112,098
Charge-offs	—			—			(218		)	(1,771		)	(53		)	(2,042		)
Recoveries	1,373			1,738			1,184			681			24			5,000
Provision	165			(903		)	(1,233		)	2,028			(57		)	—
Ending balance	$	19,537		$	28,946		$	6,399		$	59,589		$	585		$	115,056
2014
Beginning Balance	$	16,700		$	34,853		$	11,297		$	39,493		$	1,556		$	103,899
Charge-offs	(78		)	(330		)	(523		)	(1,038		)	(5		)	(1,974		)
Recoveries	498			1,248			314			1,254			191			3,505
Provision	(247		)	(1,422		)	(861		)	3,152			(115		)	507
Ending balance	$	16,873		$	34,349		$	10,227		$	42,861		$	1,627		$	105,937

	Six Months Ended June 30,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
Charge-offs	—			—			(618		)	(2,164		)	(107		)	(2,889		)
Recoveries	1,530			2,121			1,717			1,597			64			7,029
Provision	(551		)	(1,958		)	(2,156		)	5,590			(225		)	700
Ending balance	$	19,537		$	28,946		$	6,399		$	59,589		$	585		$	115,056
2014
Beginning Balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050
Charge-offs	(78		)	(501		)	(929		)	(2,516		)	(17		)	(4,041		)
Recoveries	709			1,808			867			2,176			361			5,921
Provision	1,723			978			(1,351		)	3,544			(887		)	4,007
Ending balance	$	16,873		$	34,349		$	10,227		$	42,861		$	1,627		$	105,937

The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment: 

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of June 30, 2015:
Recorded Investment:
Impaired loans with an allowance recorded	$	19,274	$	43,135	$	11,805	$	13,477	$	18,542	$	10	$	126	$	106,369
Impaired loans with no allowance recorded	15,062		15,889		2		9,134		576		3,920		197		44,780
Total loans individually evaluated for impairment	34,336		59,024		11,807		22,611		19,118		3,930		323		151,149
Loans collectively evaluated for impairment	1,967,622		2,068,457		4,555,653		293,200		983,580		179,448		23,630		10,071,590
Loans acquired with deteriorated credit quality	17,322		67,537		8,843		4,780		—		—		—		98,482
Total recorded investment	$	2,019,280	$	2,195,018	$	4,576,303	$	320,591	$	1,002,698	$	183,378	$	23,953	$	10,321,221
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	21,847	$	43,929	$	12,235	$	17,196	$	18,659	$	10	$	139	$	114,015
Impaired loans with no allowance recorded	15,349		15,954		2		10,026		765		4,071		197		46,364
Total loans individually evaluated for impairment	37,196		59,883		12,237		27,222		19,424		4,081		336		160,379
Loans collectively evaluated for impairment	1,967,622		2,068,457		4,555,653		293,200		983,580		179,448		23,630		10,071,590
Loans acquired with deteriorated credit quality	23,124		95,187		11,151		5,852		—		—		—		135,314
Total unpaid principal balance	$	2,027,942	$	2,223,527	$	4,579,041	$	326,274	$	1,003,004	$	183,529	$	23,966	$	10,367,283
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	1,330	$	2,004	$	1,685	$	717	$	1,416	$	1	$	4	$	7,157
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	1,330		2,004		1,685		717		1,416		1		4		7,157
Loans collectively evaluated for impairment	11,684		13,891		55,363		5,682		18,121		2,540		581		107,862
Loans acquired with deteriorated credit quality	—		37		—		—		—		—		—		37
Total allowance for credit losses	$	13,014	$	15,932	$	57,048	$	6,399	$	19,537	$	2,541	$	585	$	115,056

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	28,024	$	44,937	$	11,399	$	19,300	$	21,052	$	41	$	175	$	124,928
Impaired loans with no allowance recorded	16,869		21,387		2,350		—		696		332		188		41,822
Total loans individually evaluated for impairment	44,893		66,324		13,749		19,300		21,748		373		363		166,750
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	17,912		75,822		330		2,410		—		—		—		96,474
Total recorded investment	$	1,732,888	$	2,052,566	$	3,326,708	$	299,402	$	748,053	$	205,639	$	33,009	$	8,398,265
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	31,292	$	45,853	$	11,829	$	24,420	$	21,169	$	41	$	187	$	134,791
Impaired loans with no allowance recorded	17,010		21,550		4,104		—		885		483		188		44,220
Total loans individually evaluated for impairment	48,302		67,403		15,933		24,420		22,054		524		375		179,011
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	24,273		108,935		1,150		3,439		—		—		—		137,797
Total unpaid principal balance	$	1,742,658	$	2,086,758	$	3,329,712	$	305,551	$	748,359	$	205,790	$	33,021	$	8,451,849
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	2,082	$	2,537	$	1,926	$	1,052	$	3,112	$	39	$	17	$	10,765
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	2,082		2,537		1,926		1,052		3,112		39		17		10,765
Loans collectively evaluated for impairment	10,198		13,734		49,809		6,404		15,446		2,761		836		99,188
Loans acquired with deteriorated credit quality	174		58		31		—		—		—		—		263
Total allowance for credit losses	$	12,454	$	16,329	$	51,766	$	7,456	$	18,558	$	2,800	$	853	$	110,216

Troubled Debt Restructurings

A TDR loan is a loan on which the Company, for reasons related to a borrower’s financial difficulties, grants a concession to the borrower that the Company would not otherwise consider. The loan terms that have been modified or restructured due to a borrower’s financial situation include, but are not limited to, a reduction in the stated interest rate, an extension of the maturity or renewal of the loan at an interest rate below current market, a reduction in the face amount of the debt, a reduction in the accrued interest, or deferral of interest payments. The majority of the Company's modifications are extensions in terms or deferral of payments which result in no lost principal or interest followed by reductions in interest rates or accrued interest. A TDR loan is also considered impaired. Consistent with regulatory guidance, a TDR loan that is subsequently modified in another restructuring agreement but has shown sustained performance and classification as a TDR, will be removed from TDR status provided that the modified terms were market-based at the time of modification.

The following table presents information on the financial effects of TDR loans by class for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	—	—		—		—		—		—
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	—	—		—		—		—		—
Consumer	—	—		—		—		—		—
Total	1	$	256	$	—	$	—	$	256	$	—

	Six Months Ended June 30, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	—	—		—		—		—		—
Multi-family	—	—		—		—		—		—
Commercial and industrial		—
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development		—
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	—	—		—		—		—		—
Consumer	—	—		—		—		—		—
Total	1	$	256	$	—	$	—	$	256	$	—

	Three Months Ended June 30, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	1	13,423		—		—		13,423		8
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	966		—		—		966		1
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	2	897		281		33		583		7
Consumer	—	—		—		—		—		—
Total	4	$	15,286	$	281	$	33	$	14,972	$	16

	Six Months Ended June 30, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	1	$	798	$	378	$	117	$	303	$	33
Non-owner occupied	1	13,423		—		—		13,423		8
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	2	1,029		—		—		1,029		4
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	3	1,302		447		70		785		7
Consumer	—	—		—		—		—		—
Total	7	$	16,552	$	825	$	187	$	15,540	$	52

The following table presents TDR loans by class for which there was a payment default during the period: 

	Three Months Ended June 30,
	2015			2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	1	$	92
Non-owner occupied	—	—		—	—
Multi-family	—	—		—	—
Commercial and industrial
Commercial	—	—		2	306
Leases	—	—		—	—
Construction and land development
Construction	—	—		—	—
Land	—	—		—	—
Residential real estate	1	202		—	—
Consumer	—	—		—	—
Total	1	$	202	3	$	398

	Six Months Ended June 30,
	2015			2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	2	$	395
Non-owner occupied	—	—		—	—
Multi-family	—	—		—	—
Commercial and industrial
Commercial	—	—		3	369
Leases	—	—		—	—
Construction and land development
Construction	1	137		—	—
Land	—	—		—	—
Residential real estate	1	202		1	202
Consumer	—	—		—	—
Total	2	$	339	6	$	966

A TDR loan is deemed to have a payment default when it becomes past due 90 days, goes on non-accrual, or is restructured again. Payment defaults, along with other qualitative indicators, are considered by management in the determination of the allowance for credit losses.

At June 30, 2015, there were no loan commitments outstanding on TDR loans. At December 31, 2014, there was $1.2 million loan commitments outstanding on TDR loans.

Loan Purchases and Sales

For the three months ended June 30, 2015 and 2014, the Company had secondary market loan purchases of $7.7 million and $16.7 million, respectively. For the six months ended June 30, 2015 and 2014, secondary market loan purchases totaled $26.1 million and $32.3 million, respectively. For 2015, these purchased loans consisted of $13.0 million of commercial and industrial loans and $13.1 million of commercial real estate loans. For 2014, these purchased loans consisted of commercial and industrial loans. In addition, the Company periodically acquires newly originated loans at closing through participations or loan syndications.

During the six months ended June 30, 2015, the Company sold loans, which primarily consisted of commercial and industrial loans, with a carrying value of $56.3 million and recognized a gain of $0.3 million on the sale. The Company had no significant loan sales in 2014.

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Investment Securities

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

The carrying amounts and fair values of investment securities at June 30, 2015 and December 31, 2014 are summarized as follows: 

	June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	10,754	$	—		$	10,804
Commercial MBS issued by GSEs	13,145		64		—			13,209
Corporate debt securities	13,097		568		—			13,665
CRA investments	32,599		—		(62		)	32,537
Municipal obligations	281,895		10,889		(371		)	292,413
Preferred stock	82,888		1,935		(1,772		)	83,051
Private label commercial MBS	4,908		71		—			4,979
Private label residential MBS	102,760		250		(939		)	102,071
Residential MBS issued by GSEs	861,681		11,297		(1,621		)	871,357
Trust preferred securities	32,000		—		(6,352		)	25,648
U.S. government sponsored agency securities	24,906		—		(297		)	24,609
U.S. treasury securities	3,891		—		—			3,891
Total AFS securities	$	1,453,820	$	35,828	$	(11,414	)	$	1,478,234
Securities measured at fair value
Residential MBS issued by GSEs								$	1,701

	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
Available-for-sale
Collateralized debt obligations	$	50	$	11,395	$	—		$	11,445
Commercial MBS issued by GSEs	2,047		100		—			2,147
Corporate debt securities	52,773		717		(1,001		)	52,489
CRA investments	24,302		30		—			24,332
Municipal obligations	285,398		13,688		(49		)	299,037
Mutual funds	37,449		500		(247		)	37,702
Preferred stock	83,192		2,099		(2,679		)	82,612
Private label commercial MBS	5,017		132		—			5,149
Private label residential MBS	70,985		379		(1,121		)	70,243
Residential MBS issued by GSEs	881,734		11,440		(1,985		)	891,189
Trust preferred securities	32,000		—		(6,454		)	25,546
U.S. government-sponsored agency securities	18,701		—		(355		)	18,346
Total AFS securities	$	1,493,648	$	40,480	$	(13,891	)	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs								$	1,858

For additional information on the fair value changes of the securities measured at fair value, see the trading securities table in "Note 14. Fair Value Accounting" of these Notes to Unaudited Consolidated Financial Statements.

The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI for both debt and equity securities is a decline in the market value below the amount recorded for an investment, and taking into account the severity and duration of the decline. Another potential indication of OTTI is a downgrade below investment grade. In determining whether an impairment is OTTI, the Company considers the length of time and the extent to which the market value has been below cost, recent events specific to the issuer, including investment downgrades by rating agencies and economic conditions of its industry, and the Company’s ability and intent to hold the investment for a period of time sufficient to allow for any anticipated recovery. For marketable equity securities, the Company also considers the issuer’s financial condition, capital strength, and near-term prospects.

For debt securities, for the purpose of an OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates and industry and issuer-specific factors), the issuer’s financial condition, near-term prospects, and current ability to make future payments in a timely manner, as well as the issuer’s ability to service debt, and any change in agencies’ ratings at the evaluation date from the acquisition date and any likely imminent action. For ARPS with a fair value below cost that is not attributable to the credit deterioration of the issuer, such as a decline in cash flows from the security or a downgrade in the security’s rating below investment grade, a loss is recorded in other comprehensive income rather than earnings when the Company determines that it has the intent and ability to retain its investment for a period of time sufficient to allow for any anticipated recovery in fair value.

The Company has reviewed securities for which there is an unrealized loss in accordance with its accounting policy for OTTI described above and determined that there were no impairment charges for the three and six months ended June 30, 2015 and 2014. The Company does not consider any securities to be other-than-temporarily impaired as of June 30, 2015 and December 31, 2014. No assurance can be made that OTTI will not occur in future periods.

Information pertaining to securities with gross unrealized losses at June 30, 2015 and December 31, 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	June 30, 2015
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
CRA investments	$	62	$	24,446	$	—	$	—	$	62	$	24,446
Municipal obligations	371		20,722		—		—		371		20,722
Preferred stock	513		16,791		1,259		17,798		1,772		34,589
Private label residential MBS	365		31,789		574		22,920		939		54,709
Residential MBS issued by GSEs	655		116,929		966		43,114		1,621		160,043
Trust preferred securities	—		—		6,352		25,648		6,352		25,648
U.S. government sponsored agency securities	—		—		297		18,403		297		18,403
Total AFS securities	$	1,966	$	210,677	$	9,448	$	127,883	$	11,414	$	338,560

	December 31, 2014
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Corporate debt securities	$	139	$	9,860	$	862	$	29,139	$	1,001	$	38,999
Municipal obligations	—		—		49		4,430		49		4,430
Mutual funds	247		25,855		—		—		247		25,855
Preferred stock	232		13,811		2,447		28,109		2,679		41,920
Private label residential MBS	157		24,056		964		26,614		1,121		50,670
Residential MBS issued by GSEs	227		49,217		1,758		97,296		1,985		146,513
Trust preferred securities	—		—		6,454		25,546		6,454		25,546
U.S. government sponsored agency securities	—		—		355		18,346		355		18,346
Total AFS securities	$	1,002	$	122,799	$	12,889	$	229,480	$	13,891	$	352,279

At June 30, 2015 and December 31, 2014, the Company’s unrealized losses relate primarily to interest rate fluctuations, credit spread widening, and reduced liquidity in applicable markets. The total number of securities in an unrealized loss position at June 30, 2015 was 105, compared to 109 at December 31, 2014. In analyzing an issuer’s financial condition, management considers whether the securities are issued by the federal government or its agencies, whether downgrades by bond rating agencies have occurred, and industry analysis reports. Since material downgrades have not occurred and management does not intend to sell the debt securities in an unrealized loss position in the foreseeable future, none of the securities described in the above table or in this paragraph were deemed to be OTTI.

The preferred stock and trust preferred securities have yields based on floating rate LIBOR, which are highly correlated to the federal funds rate and have been negatively affected by the low rate environment. This has resulted in unrealized losses for these securities. The FRB continues to express its intention to keep interest rates, particularly the federal funds rate, at historically low levels through 2015.

The amortized cost and fair value of securities as of June 30, 2015, by contractual maturities, are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary. 

	June 30, 2015
	Amortized Cost		Estimated Fair Value
	(in thousands)
Available-for-sale
Due in one year or less	$	45,871	$	45,989
After one year through five years	68,992		71,415
After five years through ten years	102,814		105,800
After ten years	253,649		263,414
Mortgage-backed securities	982,494		991,616
Total AFS securities	$	1,453,820	$	1,478,234

The following tables summarize the carrying amount of the Company’s investment ratings position as of June 30, 2015 and December 31, 2014: 

	June 30, 2015
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	10,804	$	—	$	10,804
Commercial MBS issued by GSEs	—		13,209		—		—		—		—		—		13,209
Corporate debt securities	—		—		2,748		10,591		—		—		326		13,665
CRA investments	—		—		—		—		—		—		32,537		32,537
Municipal obligations	9,284		—		145,706		131,055		6,183		185		—		292,413
Preferred stock	—		—		—		—		55,223		18,062		9,766		83,051
Private label commercial MBS	4,979		—		—		—		—		—		—		4,979
Private label residential MBS	70,856		—		181		11,434		15,969		3,488		143		102,071
Residential MBS issued by GSEs	—		871,357		—		—		—		—		—		871,357
Trust preferred securities	—		—		—		—		25,648		—		—		25,648
U.S. government sponsored agency securities	—		24,609		—		—		—		—		—		24,609
U.S. treasury securities	—		3,891		—		—		—		—		—		3,891
Total AFS securities (1)	$	85,119	$	913,066	$	148,635	$	153,080	$	103,023	$	32,539	$	42,772	$	1,478,234
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,701	$	—	$	—	$	—	$	—	$	—	$	1,701

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

	December 31, 2014
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	11,445	$	—	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		—		—		—		—		2,147
Corporate debt securities	—		—		2,759		5,570		44,160		—		—		52,489
CRA investments	—		—		—		—		—		—		24,332		24,332
Municipal obligations	8,168		—		138,256		146,155		6,263		195		—		299,037
Mutual funds (2)	—		—		—		—		37,702		—		—		37,702
Preferred stock	—		—		—		—		54,585		17,632		10,395		82,612
Private label commercial MBS	5,149		—		—		—		—		—		—		5,149
Private label residential MBS	59,944		—		68		3,439		3,595		3,197		—		70,243
Residential MBS issued by GSEs	—		891,189		—		—		—		—		—		891,189
Trust preferred securities	—		—		—		—		25,546		—		—		25,546
U.S. government sponsored agency securities	—		18,346		—		—		—		—		—		18,346
Total AFS securities (1)	$	73,261	$	911,682	$	141,083	$	155,164	$	171,851	$	32,469	$	34,727	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	—	$	—	$	—	$	—	$	1,858

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

(2) At least 80% of mutual funds are investment grade corporate debt securities.

Securities with carrying amounts of approximately $658.8 million and $755.5 million at June 30, 2015 and December 31, 2014, respectively, were pledged for various purposes as required or permitted by law.

The following table presents gross gains and losses on sales of investment securities: 

	Three Months Ended June 30,					Six Months Ended June 30,
	2015		2014			2015			2014
	(in thousands)
Gross gains	$	55	$	—		$	1,103		$	366
Gross losses	—		(163		)	(459		)	(163		)
Net gains on sales of investment securities	$	55	$	(163	)	$	644		$	203

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Segments

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Segments

The Company's reportable segments are aggregated primarily based on geographic location, services offered, and markets served. As a result of the Bridge acquisition on June 30, 2015, former Bridge activities were allocated between the newly formed Northern California segment and the CBL segment. As a substantial portion of Bridge's balance sheet is generated from nationally-focused business lines, the Technology and Energy Infrastructure lines of Bridge's business are included in the CBL segment. Substantially all of the remaining assets and liabilities are included in the Northern California segment. The Southern California segment represents legacy Western Alliance operations in California, excluding two branches located in northern California, which are now included in the Northern California segment. Prior period amounts have been adjusted accordingly.

The Arizona, Nevada, Southern California, and Northern California segments provide full service banking and related services to their respective markets although operations may not be domiciled in these states. The Company's CBL segment provides banking services to niche markets and, as of June 30, 2015, includes the Technology and Energy Infrastructure operations of Bridge. These CBLs are managed centrally and are broader in geographic scope, though still predominately within the Company's core market areas. The Corporate & Other segment primarily relates to our Treasury division and also includes other corporate-related items, income and expense items not allocated to other reportable segments, and inter-segment eliminations.

The Company's segment reporting process begins with the assignment of all loan and deposit accounts directly to the segments where these products are originated and/or serviced. Equity capital is assigned to each segment based on the risk profile of their assets and liabilities. With the exception of goodwill, which is assigned a 100% weighting, equity capital allocations ranged from 0% to 12% during the year, with a funds credit provided for the use of this equity as a funding source. Any excess equity not allocated to segments based on risk is assigned to the Corporate & Other segment.

Net interest income, provision for credit losses, and non-interest expense amounts are recorded in their respective segment to the extent that the amounts are directly attributable to those segments. Net interest income is recorded in each segment on a TEB with a corresponding increase in income tax expense, which is eliminated in the Corporate & Other segment.

Further, net interest income of a reportable segment includes a funds transfer pricing process that matches assets and liabilities with similar interest rate sensitivity and maturity characteristics. Using this funds transfer pricing methodology, liquidity is transferred between users and providers. A net user of funds has lending/investing in excess of deposits/borrowings and a net provider of funds has deposits/borrowings in excess of lending/investing. A segment that is a user of funds is charged for the use of funds, while a provider of funds is credited through funds transfer pricing, which is determined based on the average life of the assets or liabilities in the portfolio.

Net income amounts for each reportable segment is further derived by the use of expense allocations. Certain expenses not directly attributable to a specific segment are allocated across all segments based on key metrics, such as number of employees, average loan balances, and average deposit balances. These types of expenses include information technology, operations, human resources, finance, risk management, credit administration, legal, and marketing.

Income taxes are applied to each segment based on the effective tax rate for the geographic location of the segment. Any difference in the corporate tax rate and the aggregate effective tax rates in the segments are adjusted in the Corporate & Other segment.

As the Bridge acquisition was completed on June 30, 2015, the balance sheet data of Bridge is included in the Company's Consolidated Balance Sheet as of June 30, 2015. However, the results of operations of Bridge will be included in the Company's Consolidated Income Statements beginning on July 1, 2015. Accordingly, the results of operations of the Northern California segment for the three and six months ended June 30, 2015 and 2014 only include the operations of the Company's two previously existing Northern California branch offices.

The following is a summary of selected operating segment information as of June 30, 2015, December 31, 2014, and June 30, 2014 and for the three and six months ended June 30, 2015 and 2014.

	Arizona			Nevada			Southern California			Northern California (1)			Central Business Lines (1)			Corporate & Other (1)			Consolidated Company
At June 30, 2015	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	10.2		$	2.6		$	2.1		$	—		$	2,273.0		$	2,290.2
Loans, net of deferred loan fees and costs	2,432.8			1,761.9			1,659.9			1,077.5			3,388.0			40.5			10,360.6
Less: allowance for credit losses	(31.4		)	(22.8		)	(21.4		)	(3.2		)	(35.7		)	(0.6		)	(115.1		)
Total loans	2,401.4			1,739.1			1,638.5			1,074.3			3,352.3			39.9			10,245.5
Other assets acquired through foreclosure, net	18.6			23.4			—			1.6			—			15.7			59.3
Goodwill and other intangible assets, net	—			25.4			—			155.2			119.4			—			300.0
Other assets	43.8			63.0			13.7			15.7			29.1			409.8			575.1
Total assets	$	2,466.1		$	1,861.1		$	1,654.8		$	1,248.9		$	3,500.8		$	2,738.4		$	13,470.1
Liabilities:
Deposits	$	2,369.9		$	3,316.9		$	1,946.8		$	1,550.2		$	1,945.1		$	277.8		$	11,406.7
Borrowings and qualifying debt	—			—			—			—			—			277.8			277.8
Other liabilities	20.3			29.2			3.5			8.4			77.6			131.9			270.9
Total liabilities	2,390.2			3,346.1			1,950.3			1,558.6			2,022.7			687.5			11,955.4
Allocated equity:	267.6			244.9			182.1			281.5			409.8			128.8			1,514.7
Total liabilities and stockholders' equity	$	2,657.8		$	3,591.0		$	2,132.4		$	1,840.1		$	2,432.5		$	816.3		$	13,470.1
Excess funds provided (used)	191.7			1,729.9			477.6			591.2			(1,068.3		)	(1,922.1		)	—

(1)    Includes Bridge balances.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At December 31, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	2.3		$	5.0		$	2.2		$	0.3		$	—		$	1,702.4		$	1,712.2
Loans, net of deferred loan fees and costs	2,341.9			1,668.7			1,553.1			198.6			2,590.0			46.0			8,398.3
Less: allowance for credit losses	(30.7		)	(21.9		)	(17.9		)	(5.1		)	(34.0		)	(0.6		)	(110.2		)
Total loans	2,311.2			1,646.8			1,535.2			193.5			2,556.0			45.4			8,288.1
Other assets acquired through foreclosure, net	15.5			21.0			—			—			—			20.6			57.1
Goodwill and other intangible assets, net	—			25.9			—			—			—			—			25.9
Other assets	34.8			64.2			6.2			15.3			22.9			373.8			517.2
Total assets	$	2,363.8		$	1,762.9		$	1,543.6		$	209.1		$	2,578.9		$	2,142.2		$	10,600.5
Liabilities:
Deposits	$	2,178.0		$	3,230.6		$	1,744.5		$	584.0		$	946.6		$	247.3		$	8,931.0
Other borrowings	—			—			—			—			—			390.3			390.3
Other liabilities	17.4			40.8			8.9			0.2			72.4			138.6			278.3
Total liabilities	2,195.4			3,271.4			1,753.4			584.2			1,019.0			776.2			9,599.6
Allocated equity:	250.8			209.0			70.9			126.8			232.9			110.5			1,000.9
Total liabilities and stockholders' equity	$	2,446.2		$	3,480.4		$	1,824.3		$	711.0		$	1,251.9		$	886.7		$	10,600.5
Excess funds provided (used)	82.4			1,717.5			280.7			501.9			(1,327.0		)	(1,255.5		)	—

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
At June 30, 2014	(dollars in millions)
Assets:
Cash, cash equivalents, and investment securities	$	3.0		$	7.0		$	2.2		$	0.2		$	—		$	1,973.6		$	1,986.0
Loans, net of deferred loan fees and costs	2,131.0			1,682.6			1,515.3			179.5			1,951.5			84.6			7,544.5
Less: allowance for credit losses	(29.9		)	(23.6		)	(18.7		)	(5.1		)	(27.4		)	(1.2		)	(105.9		)
Total loans	2,101.1			1,659.0			1,496.6			174.4			1,924.1			83.4			7,438.6
Other assets acquired through foreclosure, net	13.1			24.1			—			—			—			22.1			59.3
Goodwill and other intangible assets, net	—			26.5			—			—			—			—			26.5
Other assets	42.2			62.7			10.8			15.4			21.1			361.0			513.2
Total assets	$	2,159.4		$	1,779.3		$	1,509.6		$	190.0		$	1,945.2		$	2,440.1		$	10,023.6
Liabilities:
Deposits	$	2,115.4		$	3,187.8		$	1,666.2		$	394.9		$	886.3		$	218.9		$	8,469.5
Other borrowings	—			—			—			—			—			337.5			337.5
Other liabilities	20.9			46.8			4.7			0.1			24.7			161.7			258.9
Total liabilities	2,136.3			3,234.6			1,670.9			395.0			911.0			718.1			9,065.9
Allocated equity:	233.7			212.5			83.1			105.6			152.3			170.5			957.7
Total liabilities and stockholders' equity	$	2,370.0		$	3,447.1		$	1,754.0		$	500.6		$	1,063.3		$	888.6		$	10,023.6
Excess funds provided (used)	210.6			1,667.8			244.4			310.6			(881.9		)	(1,551.5		)	—

	Arizona			Nevada			Southern California			Northern California (2)			Central Business Lines (2)			Corporate & Other (2)			Consolidated Company
Three Months Ended June 30, 2015:	(in thousands)
Net interest income (expense)	$	32,091		$	29,946		$	24,070		$	5,216		$	24,432		$	(7,037	)	$	108,718
Provision for (recovery of) credit losses	826			(3,148		)	634			513			1,251			(76		)	—
Net interest income (expense) after provision for credit losses	31,265			33,094			23,436			4,703			23,181			(6,961		)	108,718
Non-interest income	1,008			2,370			850			271			321			(7,011		)	(2,191		)
Non-interest expense	(14,507		)	(14,918		)	(11,777		)	(2,142		)	(9,548		)	(8,317		)	(61,209		)
Income (loss) from continuing operations before income taxes	17,766			20,546			12,509			2,832			13,954			(22,289		)	45,318
Income tax expense (benefit)	6,970			7,191			5,261			1,191			5,233			(15,247		)	10,599
Net income	$	10,796		$	13,355		$	7,248		$	1,641		$	8,721		$	(7,042	)	$	34,719

(2)    Excludes legacy Bridge operations; Northern California includes two legacy TPB branches.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other			Consolidated Company
Three Months Ended June 30, 2014:	(in thousands)
Net interest income (expense)	$	29,211		$	29,359		$	22,502		$	2,200		$	16,226		$	(5,600	)	$	93,898
Provision for credit losses	3			(2,011		)	(1,672		)	—			3,467			720			507
Net interest income (expense) after provision for credit losses	29,208			31,370			24,174			2,200			12,759			(6,320		)	93,391
Non-interest income	934			2,248			865			34			643			875			5,599
Non-interest expense	(12,793		)	(15,922		)	(12,410		)	(861		)	(6,640		)	(3,616		)	(52,242		)
Income (loss) from continuing operations before income taxes	17,349			17,696			12,629			1,373			6,762			(9,061		)	46,748
Income tax expense (benefit)	6,805			6,194			5,310			577			2,536			(10,716		)	10,706
Income from continuing operations	10,544			11,502			7,319			796			4,226			1,655			36,042
Loss from discontinued operations, net	—			—			—			—			—			(504		)	(504		)
Net income	$	10,544		$	11,502		$	7,319		$	796		$	4,226		$	1,151		$	35,538

	Arizona			Nevada			Southern California			Northern California (2)			Central Business Lines (2)			Corporate & Other (2)			Consolidated Company
Six Months Ended June 30, 2015:	(in thousands)
Net interest income (expense)	$	61,076		$	59,155		$	46,560		$	9,669		$	47,742		$	(12,376	)	$	211,826
Provision for (recovery of) credit losses	158			(2,799		)	266			486			2,660			(71		)	700
Net interest income (expense) after provision for credit losses	60,918			61,954			46,294			9,183			45,082			(12,305		)	211,126
Non-interest income	1,947			4,653			1,515			322			1,037			(5,732		)	3,742
Non-interest expense	(29,268		)	(29,392		)	(23,398		)	(4,159		)	(18,826		)	(10,199		)	(115,242		)
Income (loss) from continuing operations before income taxes	33,597			37,215			24,411			5,346			27,293			(28,236		)	99,626
Income tax expense (benefit)	13,180			13,025			10,265			2,248			10,235			(24,236		)	24,717
Net income	$	20,417		$	24,190		$	14,146		$	3,098		$	17,058		$	(4,000	)	$	74,909

(2)    Excludes legacy Bridge operations; Northern California includes two legacy TPB branches.

	Arizona			Nevada			Southern California			Northern California			Central Business Lines			Corporate & Other (1)			Consolidated Company
Six Months Ended June 30, 2014:	(in thousands)
Net interest income (expense)	$	55,819		$	57,954		$	43,181		$	4,313		$	30,190		$	(6,782	)	$	184,675
Provision for credit losses	1,561			(2,895		)	(1,017		)	—			5,637			721			4,007
Net interest income (expense) after provision for credit losses	54,258			60,849			44,198			4,313			24,553			(7,503		)	180,668
Non-interest income	1,710			4,384			2,015			65			725			1,255			10,154
Non-interest expense	(26,053		)	(31,005		)	(24,358		)	(1,887		)	(13,148		)	(5,260		)	(101,711		)
Income (loss) from continuing operations before income taxes	29,915			34,228			21,855			2,491			12,130			(11,508		)	89,111
Income tax expense (benefit)	11,734			11,981			9,190			1,047			4,549			(17,171		)	21,330
Income from continuing operations	18,181			22,247			12,665			1,444			7,581			5,663			67,781
Loss from discontinued operations, net	—			—			—			—			—			(1,158		)	(1,158		)
Net income	$	18,181		$	22,247		$	12,665		$	1,444		$	7,581		$	4,505		$	66,623

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Income Taxes

6 Months Ended

Jun. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

The effective tax rate was 23.39% and 22.90% for the three months ended June 30, 2015 and 2014, respectively. For the six months ended June 30, 2015 and 2014, the Company's effective tax rate was 24.81%, and 23.94%, respectively. The increase in the effective tax rate is due primarily to proportionately lower tax-exempt income, increased state taxes, and a decrease in the amount of valuation allowance that will be released during 2015.

As of June 30, 2015, there is $0.5 million recorded for unrecognized tax benefits, all of which carried over from the Bridge acquisition. Management believes that this recorded liability for unrecognized tax benefits is adequate. The Company estimates that it is reasonably possible that the entire liability for unrecognized tax benefits will be settled within the next twelve months.

Interest and penalties related to unrecognized tax benefits are recognized in the provision for income taxes. As of June 30, 2015, a liability has not been recorded for interest or penalties. All of the Company's unrecognized tax benefits relate to legacy Bridge positions. Therefore, all amounts of interest and penalties through June 30, 2015 were recorded in the pre-acquisition period.

Deferred tax assets and liabilities are included in the Consolidated Financial Statements at currently enacted income tax rates applicable to the period in which the deferred tax assets or liabilities are expected to be reversed. As changes in tax laws or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes.

For the six months ended June 30, 2015, the net deferred tax assets increased$19.4 million to $82.1 million. This overall increase in the net deferred tax asset was primarily the result of the Bridge acquisition and an increase in the allowance for credit losses.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $82.1 million at June 30, 2015 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies within the meaning of ASC 740, Income Taxes, that could be implemented if necessary to prevent a carryover from expiring.

As of June 30, 2015 and December 31, 2014, the Company had a $1.1 million and $1.8 million, respectively, deferred tax valuation allowance related to net capital loss carryovers from the sale of preferred stock investments and $0.5 million, for both periods, related to IRC Section 382 limitations associated with the Company's acquisition of Western Liberty.

The deferred tax asset related to federal and state NOL carryovers outstanding at June 30, 2015 and December 31, 2014 available to reduce the tax liability in future years totaled $8.5 million. The entire $8.5 million of tax benefits relate to federal NOL carryovers (subject to an annual limitation imposed by IRC Section 382). The Company’s ability to use federal NOL carryovers, as well as its ability to use certain future tax deductions called NUBILs associated with the Company's acquisitions of Western Liberty and Centennial, will be subject to separate annual limitations of $1.8 million and $1.6 million of deductions from taxable income, respectively. In management’s opinion, it is more-likely-than-not that the results of future operations will generate sufficient taxable income to realize all but $0.5 million of the deferred tax benefits related to these NOL carryovers and NUBILs.

Investments in LIHTC

The Company invests in LIHTC funds that are designed to generate a return primarily through the realization of federal tax credits.

Investments in LIHTC and unfunded LIHTC obligations are included as part of other assets and other liabilities, respectively, in the Consolidated Balance Sheets and total $126.9 million and $43.8 million, respectively, as of June 30, 2015. For the three months ended June 30, 2015 and 2014, $2.2 million and $3.3 million of amortization related to LIHTC investments was recognized as a component of current income tax expense, respectively. For the six months ended June 30, 2015 and 2014, $5.6 million and $6.3 million of amortization related to LIHTC investments was recognized as a component of income tax expense, respectively.

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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Operating Loss Carryforwards [Line Items]
Amortization of Low Income Housing Tax Credits	$ 2,200	$ 3,300	$ 5,600	$ 6,300
Effective Income Tax Rate Reconciliation, Percent	23.39%	22.90%	24.81%	23.94%
Unrecognized Tax Benefits	$ 500		$ 500
Decreased deferred tax assets net			19,400
Recognized net deferred tax asset	82,075		82,075		$ 62,686
Deferred Tax Assets, Valuation Allowance	1,100		1,100		$ 1,800
Deferred tax asset related to federal and state net operating loss carry forwards outstanding	8,500		8,500
Tax benefits from federal net operating loss carry forwards	8,500
Tax Credit Carryforward, Valuation Allowance	500		500
ARIZONA
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Valuation Allowance	500		500
Western Liberty Bancorp [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward Annual Limitations on Deductions From Taxable Income	1,800		1,800
Centennial Bank [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward Annual Limitations on Deductions From Taxable Income	$ 1,600		$ 1,600

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Accumulated Other Comprehensive Income

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income (loss) by component, net of tax, for the periods indicated: 

	Three Months Ended June 30,
	2015										2014
	Unrealized holding gains (losses) on AFS			Unrealized holding gains on SERP		Impairment loss on securities		Total			Unrealized holding gains (losses) on AFS			Impairment loss on securities		Total
	(in thousands)
Beginning Balance	$	23,279		$	—	$	144	$	23,423		$	(11,275	)	$	144	$	(11,131	)
SERP assumed in Bridge acquisition	—			337		—		337			—			—		—
Transfer of HTM securities to AFS	—			—		—		—			8,976			—		8,976
Other comprehensive (loss) income before reclassifications	(8,378		)	—		—		(8,378		)	10,525			—		10,525
Amounts reclassified from accumulated other comprehensive income	(34		)	—		—		(34		)	102			—		102
Net current-period other comprehensive (loss) income	(8,412		)	337		—		(8,075		)	19,603			—		19,603
Ending Balance	$	14,867		$	337	$	144	$	15,348		$	8,328		$	144	$	8,472

	Six Months Ended June 30,
	2015										2014
	Unrealized holding gains (losses) on AFS			Unrealized holding gains on SERP		Impairment loss on securities		Total			Unrealized holding gains (losses) on AFS			Impairment loss on securities		Total
	(in thousands)
Beginning Balance	$	16,495		$	—	$	144	$	16,639		$	(21,690	)	$	144	$	(21,546	)
SERP assumed in Bridge acquisition	—			337		—		337
Transfer of HTM securities to AFS	—			—		—		—			8,976			—		8,976
Other comprehensive (loss) income before reclassifications	(1,225		)	—		—		(1,225		)	21,169			—		21,169
Amounts reclassified from accumulated other comprehensive income	(403		)	—		—		(403		)	(127		)	—		(127		)
Net current-period other comprehensive (loss) income	(1,628		)	337		—		(1,291		)	30,018			—		30,018
Ending Balance	$	14,867		$	337	$	144	$	15,348		$	8,328		$	144	$	8,472

The following table presents reclassifications out of accumulated other comprehensive income (loss): 

	Three Months Ended June 30,						Six Months Ended June 30,
Income Statement Classification	2015			2014			2015			2014
	(in thousands)
Gain (loss) on sales of investment securities, net	$	55		$	(163	)	$	644		$	203
Income tax expense	(21		)	61			(241		)	(76		)
Net of tax	$	34		$	(102	)	$	403		$	127

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Loans, Leases and Allowance for Credit Losses - Changes in Accretable Discount for Loans Purchased with Credit Quality Deterioration (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Additions		$ 857	$ 0	$ 857	$ 0
Balance at beginning of period		17,956	26,831	19,156	28,164
Reclassifications from non-accretable to accretable yield (1)	[1]	265	1,564	695	3,030
Accretion to interest income		(1,012)	(1,798)	(2,090)	(4,202)
Reversal of fair value adjustments upon disposition of loans		(876)	(3,414)	(1,428)	(3,809)
Balance at end of period		$ 17,190	$ 23,183	$ 17,190	$ 23,183

[1] The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

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Other Assets Acquired Through Foreclosure

6 Months Ended

Jun. 30, 2015

Other Real Estate, Foreclosed Assets, and Repossessed Assets [Abstract]

Other Assets Acquired Through Foreclosure

The following table represents the changes in other assets acquired through foreclosure: 

	Three Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	77,968		$	(14,209	)	$	63,759
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	5,739			—			5,739
Proceeds from sale of other real estate owned and repossessed assets, net	(15,415		)	2,480			(12,935		)
Valuation adjustments, net	—			(718		)	(718		)
Gains, net (1)	1,940			—			1,940
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	72,226		$	(15,776	)	$	56,450
Transfers to other assets acquired through foreclosure, net	4,309			—			4,309
Proceeds from sale of other real estate owned and repossessed assets, net	(1,903		)	683			(1,220		)
Valuation adjustments, net	—			(258		)	(258		)
Gains, net (1)	11			—			11
Balance, end of period	$	74,643		$	(15,351	)	$	59,292
	Six Months Ended June 30,
	2015
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	71,421		$	(14,271	)	$	57,150
Additions from acquisition of Bridge	1,550			—			1,550
Transfers to other assets acquired through foreclosure, net	13,459			—			13,459
Proceeds from sale of other real estate owned and repossessed assets, net	(17,703		)	3,328			(14,375		)
Valuation adjustments, net	—			(1,504		)	(1,504		)
Gains, net (2)	3,055			—			3,055
Balance, end of period	$	71,782		$	(12,447	)	$	59,335
	2014
Balance, beginning of period	$	88,421		$	(21,702	)	$	66,719
Transfers to other assets acquired through foreclosure, net	6,419			—			6,419
Proceeds from sale of other real estate owned and repossessed assets, net	(21,376		)	6,644			(14,732		)
Valuation adjustments, net	—			(293		)	(293		)
Gains, net (2)	1,179			—			1,179
Balance, end of period	$	74,643		$	(15,351	)	$	59,292

(1) Includes net gains related to initial transfers to other assets of zero during both the three months ended June 30, 2015 and 2014, pursuant to accounting guidance.

(2) Includes net gains related to initial transfers to other assets of $0.6 million and zero during the six months ended June 30, 2015 and 2014, respectively, pursuant to accounting guidance.

At June 30, 2015 and December 31, 2014, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 56 properties at June 30, 2015, compared to 67 at December 31, 2014.

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Other Borrowings

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Other Borrowings

The following table summarizes the Company’s borrowings as of June 30, 2015 and December 31, 2014: 

	June 30, 2015		December 31, 2014
	(in thousands)
Short-Term:
Revolving line of credit	$	—	$	25,000
FHLB advances	11,051		96,987
Other short-term debt	58,378		58,182
Total short-term borrowings	$	69,429	$	180,169
Long-Term:
FHLB advances	$	—	$	210,094
Total long-term borrowings	$	—	$	210,094

The Company maintains other lines of credit with correspondent banks totaling $70.0 million, of which $25.0 million is secured by pledged securities and $45.0 million is unsecured. As of June 30, 2015, there were no outstanding balances on the Company's lines of credit. At December 31, 2014, the Company had revolving lines of credit with other institutions with outstanding advances totaling $25.0 million, at an interest rate of 1.75%. In addition, the Bank has entered into federal funds credit line agreements with correspondent banks under which it can borrow up to $100.0 million on an unsecured basis. There were no amounts outstanding on these lines of credit as of June 30, 2015 and December 31, 2014. The lending institutions will determine the interest rate charged on funds at the time of the borrowing.

The Company maintains lines of credit with the FHLB and the FRB. The Company’s borrowing capacity is determined based on collateral pledged, generally consisting of investment securities and loans, at the time of the borrowing. At June 30, 2015, there were $11.1 million of FHLB advances classified as short-term with a weighted average interest rate of 1.61%. At December 31, 2014, short-term FHLB advances of $97.0 million had a weighted average interest rate of 1.24%.

The Company also has outstanding 10% Senior Notes of $58.4 million at June 30, 2015, maturing in September 2015. The weighted average interest rate on all short-term debt is 8.67% at June 30, 2015, compared to 4.15% at December 31, 2014.

During the second quarter, the Company paid off $200.0 million of FHLB advances classified as long-term for a loss on extinguishment of $0.1 million. As of December 31, 2014, long-term FHLB advances of $210.1 million had a weighted average interest rate of 1.06%.

As of June 30, 2015 and December 31, 2014, the Company had additional available credit with the FHLB of approximately $1.53 billion and $935.0 million, respectively, and with the FRB of approximately $1.63 billion and $1.15 billion, respectively.

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Stockholders' Equity

6 Months Ended

Jun. 30, 2015

Stockholders' Equity Note [Abstract]

Stockholder's Equity

Common Stock Issuance

In Connection with Bridge Acquisition

Under the terms of the Bridge merger agreement, each share of Bridge common stock issued and outstanding as of June 30, 2015, the acquisition date, was exchanged for 0.8145 shares of WAL common stock and $2.39 in cash. This resulted in the issuance of 12,451,240 shares, or $420.4 million, of the Company's common stock and payment of $36.5 million in cash.

Under ATM Distribution Agreement

On June 4, 2014, the Company entered into a distribution agency agreement with Credit Suisse Securities (USA) LLC, under which the Company may sell shares of its common stock up to an aggregate offering price of $100.0 million on the New York Stock Exchange. The parties executed an Amended and Restated Distribution Agency Agreement on October 30, 2014. The Company pays Credit Suisse a mutually agreed rate, not to exceed 2% of the gross offering proceeds of the shares. The common stock will be sold at prevailing market prices at the time of the sale or at negotiated prices and, as a result, prices will vary.

Sales in the ATM offering are being made pursuant to a prospectus dated May 14, 2012 and a prospectus supplement filed with the SEC on June 4, 2014, in connection with one or more offerings of shares from the Company's shelf registration statement on Form S-3 (No. 333-181128). During the three and six months ended June 30, 2015, there were no sales under the ATM offering. During the three and six months ended June 30, 2014, the Company sold 115,866 shares under the ATM offering at a weighted-average selling price of $24.44 per share for gross proceeds of $2.8 million. Total offering costs under the ATM program for the three and six months ended June 30, 2014 were $0.2 million, of which less than $0.1 million relates to compensation costs paid to Credit Suisse Securities.

Stock-Based Compensation

Equity Awards Assumed in Bridge Acquisition

In connection with the Bridge acquisition, the Company assumed unvested restricted stock awards and stock options originally granted by Bridge and converted them into WAL restricted stock awards and stock options. Bridge equity awards were converted into WAL equity awards at a conversion ratio of 0.905, resulting in the issuance of 546,151 shares of WAL restricted stock and 213,091 of WAL options. The portion of the fair value of these equity awards associated with prior service of Bridge employees represents a component of the total consideration for the Bridge acquisition, which totaled $10.7 million.

Bridge's restricted stock awards generally had an original vesting period of five years. The remaining vesting period of these awards remained unchanged upon conversion. The value of restricted stock replacement awards were based on WAL's stock price as of the acquisition date and totaled $17.0 million as of June 30, 2015, of which $9.0 million is considered purchase price consideration for pre-combination service and $8.0 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the awards.

Bridge's stock options had an original vesting period of four years and a contractual term of ten years. Stock option replacement awards were valued using the Black-Scholes option valuation model, using the following weighted average assumptions.

	June 30, 2015
Dividend yield	—		%
Volatility	33.96		%
Risk-free interest rate	2.11		%
Expected life in years	7.66
Weighted average fair value of assumed options	$	19.06

The total value of assumed stock options as of June 30, 2015 totaled $4.1 million, of which $1.7 million is considered purchase price consideration for pre-combination service and $2.3 million is post-combination compensation service expense that will be recognized over the remaining vesting period of the options.

Restricted Stock

For the three and six months ended June 30, 2015, 44,975 and 335,975 shares of restricted stock that generally vest over three years were granted to Company employees and 64,000 shares of restricted stock that were fully vested at June 30, 2015 were granted to non-employee WAL and WAB directors. The Company estimates the compensation cost for restricted stock grants based upon the grant date fair value. The aggregate grant date fair value for the restricted stock issued during the three and six months ended June 30, 2015 was $1.4 million and $10.9 million, respectively. For the three and six months ended June 30, 2015, the Company recognized $2.6 million and $5.1 million, respectively, in stock-based compensation expense related to these restricted stock grants, compared to $1.9 million and $3.6 million, respectively, in stock-based compensation expense for the three and six months ended June 30, 2014.

In addition, the Company granted 52,200 shares of restricted stock to certain members of executive management that have both performance and service conditions that affect vesting. The performance condition is based on achieving an EPS target for fiscal year 2015 and, if this target is met, the restricted stock awards will vest over a three-year service period. Assuming the EPS target is met, the grant date fair value of the awards was $1.4 million. For the three and six months ended June 30, 2015, the Company recognized $0.1 million and $0.2 million, respectively, in stock-based compensation expense related to these restricted stock grants. There was no related stock-based compensation expense for the three and six months ended June 30, 2014.

There were approximately 1.5 million and 1.1 million restricted shares outstanding at June 30, 2015 and December 31, 2014, respectively.

Performance Stock Units

The Company grants executive management committee members performance stock units that do not vest unless the Company achieves a specified cumulative EPS target over a three-year performance period. The number of shares issued will vary based on the cumulative EPS target that is achieved. The Company estimates the cost of performance stock units based upon the grant date fair value and expected vesting percentage over the three-year performance period. For the three and six months ended June 30, 2015, the Company recognized $1.0 million and $2.0 million, respectively, in stock-based compensation expense related to these performance stock units, compared to $0.7 million and $1.5 million, respectively, in stock-based compensation expense for the three and six months ended June 30, 2014.

The first three-year performance period ended on December 31, 2014, and the Company's cumulative EPS for the performance period exceeded the level required for a maximum award under the terms of the grant. As a result, on February 18, 2015, executive management committee members were granted 285,000 of fully vested common shares.

As of June 30, 2015, outstanding performance stock unit grants made in 2013 and 2014 are expected to pay out at the maximum award amount, or 514,450 common shares. In January 2015, performance stock units were granted to executive management committee members with cumulative target awards equivalent to 104,300 shares of common stock. Assuming a 100% vesting percentage for the 2015 performance stock units, the grant date fair value of the awards was $2.8 million.

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Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructured Loans by Class for Which There was Payment Default (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2014 USD ($) SecurityLoan	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	3	2	6
Recorded Investment	$ 202	$ 398	$ 339	$ 966
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	1	0	2
Recorded Investment	$ 0	$ 92	$ 0	$ 395
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	2	0	3
Recorded Investment	$ 0	$ 306	$ 0	$ 369
Construction and land development [Member] | Land [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0
Construction and land development [Member] | Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	1	0
Recorded Investment	$ 0	$ 0	$ 137	$ 0
Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	0	1	1
Recorded Investment	$ 202	$ 0	$ 202	$ 202
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Recorded Investment	$ 0	$ 0	$ 0	$ 0

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Income Taxes - Low Income Housing Tax Credit (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Investment in Low Income Housing Tax Credit	$ 126.9		$ 126.9
Unfunded Low Income Housing Tax Credit Obligations	43.8		43.8
Amortization of Low Income Housing Tax Credits	$ 2.2	$ 3.3	$ 5.6	$ 6.3

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Loans, Leases and Allowance for Credit Losses Acquired Loans (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	$ 1,472,240
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,616,303
Business Combination, Acquired Receivables, Fair Value	1,447,135
Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	14,309
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	13,196
Business Combination, Acquired Receivables, Fair Value	12,174
Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	1,457,931
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,603,107
Business Combination, Acquired Receivables, Fair Value	1,434,961
Commercial and industrial [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	1,109,194
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,180,482
Business Combination, Acquired Receivables, Fair Value	1,091,032
Commercial and industrial [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	10,229
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	9,613
Business Combination, Acquired Receivables, Fair Value	8,619
Commercial and industrial [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	1,098,965
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,170,869
Business Combination, Acquired Receivables, Fair Value	1,082,413
Residential real estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	26,252
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	28,952
Business Combination, Acquired Receivables, Fair Value	25,144
Residential real estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	2,455
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	2,087
Business Combination, Acquired Receivables, Fair Value	2,075
Residential real estate [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	23,797
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	26,865
Business Combination, Acquired Receivables, Fair Value	23,069
Consumer [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	938
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,169
Business Combination, Acquired Receivables, Fair Value	931
Consumer [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	0
Business Combination, Acquired Receivables, Fair Value	0
Consumer [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	938
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,169
Business Combination, Acquired Receivables, Fair Value	931
Commercial real estate [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	236,831
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	303,682
Business Combination, Acquired Receivables, Fair Value	230,950
Commercial real estate [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	1,625
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	1,496
Business Combination, Acquired Receivables, Fair Value	1,480
Commercial real estate [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	235,206
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	302,186
Business Combination, Acquired Receivables, Fair Value	229,470
Construction and land development [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	99,025
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	102,018
Business Combination, Acquired Receivables, Fair Value	99,078
Construction and land development [Member] | Receivables Acquired with Deteriorated Credit Quality [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	0
Business Combination, Acquired Receivables, Fair Value	0
Construction and land development [Member] | Acquired Non-Purchased Credit Impaired Loans [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Contractually Required Payments Receivable at Acquisition	99,025
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Acquired During Period, Cash Flows Expected to be Collected at Acquisition	102,018
Business Combination, Acquired Receivables, Fair Value	$ 99,078

XML

Loans, Leases and Allowance for Credit Losses - Troubled Debt Restructured Loans by Loan Class (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2014 USD ($) SecurityLoan	Jun. 30, 2015 USD ($) SecurityLoan	Jun. 30, 2014 USD ($) SecurityLoan
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	4	1	7
Pre-Modification Outstanding Recorded Investment	$ 256	$ 15,286	$ 256	$ 16,552
Forgiven Principal Balance	0	281	0	825
Lost Interest Income	0	33	0	187
Post-Modification Outstanding Recorded Investment	256	14,972	256	15,540
Waived Fees and Other Expenses	$ 0	$ 16	$ 0	$ 52
Residential real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	2	0	3
Pre-Modification Outstanding Recorded Investment	$ 0	$ 897	$ 0	$ 1,302
Forgiven Principal Balance	0	281	0	447
Lost Interest Income	0	33	0	70
Post-Modification Outstanding Recorded Investment	0	583	0	785
Waived Fees and Other Expenses	$ 0	$ 7	$ 0	$ 7
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0	$ 0
Owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 798
Forgiven Principal Balance	0	0	0	378
Lost Interest Income	0	0	0	117
Post-Modification Outstanding Recorded Investment	0	0	0	303
Waived Fees and Other Expenses	$ 0	$ 0	$ 0	$ 33
Non-owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	1	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 13,423	$ 0	$ 13,423
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	13,423	0	13,423
Waived Fees and Other Expenses	$ 0	$ 8	$ 0	$ 8
Multi-family [Member] | Commercial real estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0	$ 0
Commercial [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	1	1	1	2
Pre-Modification Outstanding Recorded Investment	$ 256	$ 966	$ 256	$ 1,029
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	256	966	256	1,029
Waived Fees and Other Expenses	$ 0	$ 1	$ 0	$ 4
Leases [Member] | Commercial and industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0	$ 0
Construction [Member] | Construction and land development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0	$ 0
Land [Member] | Construction and land development [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | SecurityLoan	0	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0	$ 0
Forgiven Principal Balance	0	0	0	0
Lost Interest Income	0	0	0	0
Post-Modification Outstanding Recorded Investment	0	0	0	0
Waived Fees and Other Expenses	$ 0	$ 0	$ 0	$ 0

XML

Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended		12 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)		$ 284	$ 0	$ (641)	$ 0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		0	(58)	0	(58)
Other assets acquired through foreclosure, net		59,335	59,292	59,335	59,292	$ 57,150	$ 63,759	$ 56,450	$ 66,719
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012		(7,745)	123	(8,059)	(837)
Junior subordinated debt		48,482		48,482		40,437
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		1,478,234		1,478,234		1,520,237
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other assets acquired through foreclosure, net		59,300		59,300
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		1,478,234		1,478,234		1,520,237
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		48,482		48,482		40,437
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		10,804		$ 10,804		$ 11,445
Available-for-sale Securities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt, Valuation Technique				S&P Model		S&P Model
Junior subordinated debt, Significant Unobservable Inputs				Pricing indications from comparable securities		Pricing indications from comparable securities
Investment securities - AFS, at fair value; amortized cost of $1,453,820 at June 30, 2015 and $1,493,648 at December 31, 2014		10,804		$ 10,804		$ 11,445
Available-for-sale Securities [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value		(10,804)	(58)	$ (10,804)	$ (58)	$ (11,445)	$ (10,520)	$ 0	$ 0
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt, Input Value				4.972%		6.242%
Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt		48,482		$ 48,482		$ 40,437
Junior subordinated debt, Valuation Technique				Discounted cash flow		Discounted cash flow
Junior subordinated debt, Significant Unobservable Inputs				Implied credit rating of the Company		Adjusted Corporate Bond over Treasury Index with comparable credit spread
Junior Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Included in earnings (or changes in net assets)	[1]	(7,736)	125	$ (8,045)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Description	[1]				-853
Closing balance		(48,482)	(42,711)	(48,482)	$ (42,711)	$ (40,437)
Change in unrealized gains (losses) for the twelve month period included in earnings (or changes in net assets) for the period ended December 31, 2012		(7,736)	125	(8,045)	(853)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3		$ 0	$ 0	$ 0	$ 0

[1] (1)Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

XML

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	June 30, 2015		December 31, 2014
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $358,971 at June 30, 2015 and $232,863 at December 31, 2014	$	3,230,537	$	2,164,523
Credit card commitments and financial guarantees	57,452		42,038
Standby letters of credit, including unsecured letters of credit of $33,485 at June 30, 2015 and $5,166 at December 31, 2014	73,513		49,556
Total	$	3,361,502	$	2,256,117

XML

Loans, Leases and Allowance for Credit Losses - Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class (Detail) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		$ 10,295,162	$ 8,366,782
Total Past Due		26,059	31,483
Total Non-accrual	[1]	59,425	67,659
Loans past due 90 days or more and still accruing		8,284	5,132
Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		45,657	50,893
Total Past Due		13,768	16,766
Total Non-accrual			67,659
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		2,018,462	1,730,164
Total Past Due		818	2,724
Loans past due 90 days or more and still accruing		474	1,138
Commercial real estate [Member] | Owner occupied [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		10,090	13,630
Total Past Due		0	0
Total Non-accrual		10,090	13,630
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		2,000,579	1,855,454
Total Past Due		3,807	14,487
Loans past due 90 days or more and still accruing		858	2,171
Commercial real estate [Member] | Non-owner occupied [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		26,756	30,226
Total Past Due		2,769	8,601
Total Non-accrual		29,525	38,827
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		190,207	182,180
Total Past Due		425	445
Loans past due 90 days or more and still accruing		425	0
Commercial real estate [Member] | Multi-family [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	0
Total Past Due		0	0
Total Non-accrual		0	0
Commercial and industrial [Member] | Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		4,566,978	3,324,132
Total Past Due		9,325	2,576
Loans past due 90 days or more and still accruing		4,153	703
Commercial and industrial [Member] | Commercial [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		809	2,621
Total Past Due		2,241	496
Total Non-accrual		3,050	3,117
Commercial and industrial [Member] | Leases [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		183,378	205,639
Total Past Due		0	0
Loans past due 90 days or more and still accruing		0	0
Commercial and industrial [Member] | Leases [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		3,930	373
Total Past Due		0	0
Total Non-accrual		3,930	373
Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		597,059	388,399
Total Past Due		0	0
Loans past due 90 days or more and still accruing		0	0
Construction and land development [Member] | Construction [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	0
Total Past Due		0	0
Total Non-accrual		0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		404,356	356,209
Total Past Due		1,283	3,445
Loans past due 90 days or more and still accruing		1,283	805
Construction and land development [Member] | Land [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		2,516	2,686
Total Past Due		0	2,640
Total Non-accrual		2,516	5,326
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		310,628	292,065
Total Past Due		9,963	7,337
Loans past due 90 days or more and still accruing		1,082	232
Residential real estate [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		1,556	1,332
Total Past Due		8,561	4,841
Total Non-accrual		10,117	6,173
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		23,515	32,540
Total Past Due		438	469
Loans past due 90 days or more and still accruing		9	83
Consumer [Member] | Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current		0	25
Total Past Due		197	188
Total Non-accrual		$ 197	$ 213

[1] Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

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Fair Value Accounting

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Accounting

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach, and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability. ASC 825 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy under ASC 825 are described in "Note 1. Summary of Significant Accounting Policies" of these Notes to Unaudited Consolidated Financial Statements.

In general, fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include amounts to reflect counterparty credit quality and the Company’s creditworthiness, among other things, as well as unobservable parameters. Any such valuation adjustments are applied consistently over time. The Company’s valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While management believes the Company’s valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date. Furthermore, the reported fair value amounts have not been comprehensively revalued since the presentation dates, and therefore, estimates of fair value after the balance sheet date may differ significantly from the amounts presented herein. A more detailed description of the valuation methodologies used for assets and liabilities measured at fair value is set forth below. Transfers between levels in the fair value hierarchy are recognized as of the end of the month following the event or change in circumstances that caused the transfer.

Under ASC 825, the Company elected the FVO treatment for junior subordinated debt issued by WAL. This election is irrevocable and unrealized gains and losses on these items must be reported in earnings at each reporting date. The Company did not elect FVO treatment for newly assumed Bridge junior subordinated debt.

All securities for which the fair value measurement option had been elected are included in a separate line item in the Consolidated Balance Sheet as securities measured at fair value.

For the three and six months ended June 30, 2015 and 2014, gains and losses from fair value changes included in the Consolidated Income Statements were as follows: 

	Changes in Fair Values for Items Measured at Fair Pursuant to Election of the Fair Value Option
	Unrealized Gain/(Loss) on Assets and Liabilities Measured at Fair Value, Net			Interest Income on Securities		Interest Expense on Junior Subordinated Debt			Total Changes Included in Current-Period Earnings
	(in thousands)
Three Months Ended June 30, 2015
Securities measured at fair value	$	(9	)	$	1	$	—		$	(8	)
Junior subordinated debt	(7,736		)	—		451			(7,285		)
Total	$	(7,745	)	$	1	$	451		$	(7,293	)
Six Months Ended June 30, 2015
Securities measured at fair value	$	(14	)	$	1	$	—		$	(13	)
Junior subordinated debt	(8,045		)	—		892			(7,153		)
Total	$	(8,059	)	$	1	$	892		$	(7,166	)
Three Months Ended June 30, 2014
Securities measured at fair value	$	(2	)	$	1	$	—		$	(1	)
Junior subordinated debt	125			—		(443		)	(318		)
Total	$	123		$	1	$	(443	)	$	(319	)
Six Months Ended June 30, 2014
Securities measured at fair value	$	16		$	2	$	—		$	18
Junior subordinated debt	(853		)	—		(864		)	(1,717		)
Total	$	(837	)	$	2	$	(864	)	$	(1,699	)

There were no net gains or losses recognized during the three and six months ended June 30, 2015 and 2014 on trading securities sold during the period.

Interest income on securities measured at fair value is accounted for similarly to those classified as AFS. Any premiums or discounts are recognized in interest income over the term of the securities. For MBS, estimates of prepayments are considered in the constant yield calculations. Interest expense on junior subordinated debt is also determined under a constant yield calculation.

Fair value on a recurring basis

Financial assets and financial liabilities measured at fair value on a recurring basis include the following:

Securities measured at fair value: All of the Company’s securities measured at fair value, which consist of MBS, are reported at fair value utilizing Level 2 inputs in the same manner as described below for AFS securities.

AFS securities: Preferred stock, mutual funds, and CRA investments are reported at fair value utilizing Level 1 inputs. With the exception of CDO securities, other securities classified as AFS are reported at fair value utilizing Level 2 inputs. For these securities, the Company obtains fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the bond’s terms and conditions, among other things. The Company estimates the fair value of CDO securities utilizing Level 3 inputs, which include pricing indications from comparable securities.

Independent pricing service: Our independent pricing service provides pricing information on Level 1, 2, and 3 securities, and represents the pricing source for the majority of the portfolio. Management independently evaluates the fair value measurements received from the Company's third party pricing service through multiple review steps. First, management reviews what has transpired in the marketplace with respect to interest rates, credit spreads, volatility, and mortgage rates, among other things, and develops an expectation of changes to the securities valuations from the previous quarter. Then, management obtains market values from additional sources. The pricing service provides management with observable market data including interest rate curves and mortgage prepayment speed grids, as well as dealer quote sheets, new bond offering sheets, and historical trade documentation. Management reviews the assumptions and decides whether they are reasonable. Management may compare interest rates, credit spreads and prepayments speeds used as part of the assumptions to those that management believes are reasonable. Management may price securities using the provided assumptions to determine whether they can develop similar prices on like securities. Any discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and the Company’s other valuation advisors. Last, management selects a sample of investment securities and compares the values provided by its primary third party pricing service to the market values obtained from secondary sources and evaluates those with notable variances.

Annually, the Company receives an SSAE 16 report from its independent pricing service attesting to the controls placed on the operations of the service from its auditor.

Interest rate swaps: Interest rate swaps are reported at fair value utilizing Level 2 inputs. The Company obtains dealer quotations to value its interest rate swaps.

Junior subordinated debt: The Company estimates the fair value of its junior subordinated debt using a discounted cash flow model which incorporates the effect of the Company’s own credit risk in the fair value of the liabilities (Level 3). The Company’s cash flow assumptions are based on contractual cash flows as the Company anticipates that it will pay the debt according to its contractual terms.

Given the pricing of 90 day LIBOR plus 3.20% on the Company's $150.0 million issuance of subordinated debt on June 29, 2015, the Company reviewed the methodology for calculating the estimated fair value of its outstanding junior subordinated debt, which was priced at 30 day LIBOR plus 5.96% as of March 31, 2015 under fair value option accounting.  Considering the significantly lower spread of WAB’s newly issued subordinated debt, that the Company’s debt is junior in subordination, and that the debt was issued by the parent company rather than the insured depository, the Company adjusted the spread for valuation purposes to 30 day LIBOR plus 4.69%, which is between the 90 day LIBOR plus 3.20% rate achieved on the WAB subordinated debt and 30 day LIBOR plus 5.96% rate that was previously used.  This spread reduction resulted in a non-cash, non-recurring debt valuation loss of $7.7 million during the three months ended June 30, 2015. This charge had no effect on regulatory capital.

As of June 30, 2015, the Company estimated the discount rate at 4.972%, which represents the implied credit spread of the BB Financial curve, and is a 4.69% spread plus 3 month LIBOR (0.283%). As of December 31, 2014, the Company estimated the discount rate at 6.242%, which was a 5.99% spread plus 3 month LIBOR of 0.256%.

The fair value of assets and liabilities measured at fair value on a recurring basis were determined using the following inputs as of the periods presented: 

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
June 30, 2015
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,701	$	—	$	1,701
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	10,804	$	10,804
Commercial MBS issued by GSEs	11,126		2,083		—		13,209
Corporate debt securities	326		13,339		—		13,665
CRA investments	32,537		—		—		32,537
Municipal obligations	1,235		291,178		—		292,413
Preferred stock	83,051		—		—		83,051
Private label commercial MBS	—		4,979		—		4,979
Private label residential MBS	31,527		70,544		—		102,071
Residential MBS issued by GSEs	—		871,357		—		871,357
Trust preferred securities	—		25,648		—		25,648
U.S. government sponsored agency securities	6,206		18,403		—		24,609
U.S. treasury securities	3,891		—		—		3,891
Total AFS securities	$	169,899	$	1,297,531	$	10,804	$	1,478,234
Derivative assets (1)	$	—	$	198	$	—	$	198
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	48,482	$	48,482
Derivative liabilities (1)	—		49,037		—		49,037

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a net positive value of $48,258 as of June 30, 2015, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

(2) Includes only the portion of junior subordinated debt that is recorded at fair value at each reporting period pursuant to the election of FVO treatment.

	Fair Value Measurements at the End of the Reporting Period Using:
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value
	(in thousands)
December 31, 2014
Assets:
Measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	1,858
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	11,445	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		2,147
Corporate debt securities	—		52,489		—		52,489
CRA investments	24,332		—		—		24,332
Municipal obligations	—		299,037		—		299,037
Mutual funds	37,702		—		—		37,702
Preferred stock	82,612		—		—		82,612
Private label commercial MBS	—		5,149		—		5,149
Private label residential MBS	—		70,243		—		70,243
Residential MBS issued by GSEs	—		891,189		—		891,189
Trust preferred securities	—		25,546		—		25,546
U.S. government sponsored agency securities	—		18,346		—		18,346
Total AFS securities	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Derivative assets (1)	$	—	$	7	$	—	$	7
Liabilities:
Junior subordinated debt	$	—	$	—	$	40,437	$	40,437
Derivative liabilities (1)	—		57,820		—		57,820

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans includes a positive value of $57,140 as of December 31, 2014, which relates to the effective portion of the hedges put in place to mitigate against fluctuations in interest rates.

For the three and six months ended June 30, 2015 and 2014, the change in Level 3 assets and liabilities measured at fair value on a recurring basis was as follows: 

	Junior Subordinated Debt
	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Beginning balance	$	(40,746	)	$	(42,836	)	$	(40,437	)	$	(41,858	)
Transfers into Level 3	—			—			—			—
Total gains (losses) for the period
Included in earnings (1)	(7,736		)	125			(8,045		)	(853		)
Ending balance	$	(48,482	)	$	(42,711	)	$	(48,482	)	$	(42,711	)
Change in unrealized gains (losses) for the period included in earnings	$	(7,736	)	$	125		$	(8,045	)	$	(853	)

	CDO Securities
	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015			2014
	(in thousands)
Beginning balance	$	10,520	$	—	$	11,445		$	—
Transfers into Level 3	—		58		—			58
Total gains (losses) for the period
Included in other comprehensive income (2)	284		—		$	(641	)	$	—
Ending balance	$	10,804	$	58	$	10,804		$	58

(1) Total gains (losses) for the period are included in the non-interest income line, Unrealized gains (losses) on assets and liabilities measured at fair value, net.

(2) Total gains (losses) for the period are included in the other comprehensive income line, Unrealized (loss) gain on AFS securities.

For Level 3 liabilities measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014, the significant unobservable inputs used in the fair value measurements were as follows: 

	June 30, 2015		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	48,482	Discounted cash flow	Implied credit rating of the Company
CDO securities	10,804		S&P Model	Pricing indications from comparable securities

	December 31, 2014		Valuation Technique	Significant Unobservable Inputs
	(in thousands)
Junior subordinated debt	$	40,437	Discounted cash flow	Adjusted Corporate Bond over Treasury Index with comparable credit spread
CDO securities	11,445		S&P Model	Pricing indications from comparable securities

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of June 30, 2015 was the BB Financial over SWAP index and as of December 31, 2014 was the BB 20-Year over Treasury Index with comparable credit spread. The input value used in the fair value measurement of the Company's junior subordinated debt was 4.972% and 6.242% as of June 30, 2015 and December 31, 2014, respectively.

The significant unobservable inputs used in the fair value measurement of the Company's CDO securities include securities terms, conditions, and underlying collateral type, as well as trustee and servicer reports, trade data on comparable securities, and market quotes that are converted into spreads to benchmark LIBOR curves. Significant increases or decreases in these inputs could result in significantly different fair value measurements.

Fair value on a nonrecurring basis

Certain assets are measured at fair value on a nonrecurring basis. That is, the assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). The following table presents such assets carried on the balance sheet by caption and by level within the ASC 825 hierarchy:

	Fair Value Measurements at the End of the Reporting Period Using
	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Active Markets for Similar Assets (Level 2)		Unobservable Inputs (Level 3)
	(in thousands)
As of June 30, 2015:
Impaired loans with specific valuation allowance	$	99,212	$	—	$	—	$	99,212
Impaired loans without specific valuation allowance (1)	38,010		—		—		38,010
Other assets acquired through foreclosure	59,335		—		—		59,335
As of December 31, 2014:
Impaired loans with specific valuation allowance	$	114,163	$	—	$	—	$	114,163
Impaired loans without specific valuation allowance (1)	38,019		—		—		38,019
Other assets acquired through foreclosure	57,150		—		—		57,150

(1) Excludes loan balances with charge-offs of $6.8 million and $3.8 million as of June 30, 2015 and December 31, 2014, respectively.

Impaired loans: The specific reserves for collateral dependent impaired loans are based on collateral value, net of estimated disposition costs and other identified quantitative inputs. Collateral value is determined based on third-party appraisals. Appraisals may utilize a single valuation approach or a combination of approaches, including comparable sales and the income approach. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser. Therefore, qualifying the assets as Level 3 in the fair value hierarchy. In some cases, adjustments are made to the appraised values due to various factors, including age of the appraisal (which are generally obtained every twelve months), age of comparables included in the appraisal, and known changes in the market and in the collateral. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. These Level 3 impaired loans had an estimated fair value of $106.4 million and $124.9 million at June 30, 2015 and December 31, 2014, respectively. The fair value of these Level 3 impaired loans reflects the carrying value of loan, which has been reduced by any deficit in appraised value compared to book value, estimated disposition costs, and estimated losses of similar impaired loans based on historical loss experience. Specific reserves in the allowance for loan losses for these loans were $7.2 million and $10.8 million at June 30, 2015 and December 31, 2014, respectively.

Other assets acquired through foreclosure: Other assets acquired through foreclosure consist of properties acquired as a result of, or in-lieu-of, foreclosure. These assets are initially reported at the fair value determined by independent appraisals using appraised value less estimated cost to sell. Such properties are generally re-appraised every twelve months. There is risk for subsequent volatility. Costs relating to the development or improvement of the assets are capitalized and costs relating to holding the assets are charged to expense. The Company had $59.3 million of such assets at June 30, 2015. Fair value is determined, where possible, using market prices derived from an appraisal or evaluation, which are considered to be Level 2. However, certain assumptions and unobservable inputs are often used by the appraiser; therefore, qualifying the assets as Level 3 in the fair value hierarchy. When significant adjustments are based on unobservable inputs, such as when a current appraised value is not available or management determines the fair value of the collateral is further impaired below the appraised value and there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement.

Credit vs. non-credit losses

Under the provisions of ASC 320, Investments-Debt and Equity Securities, OTTI is separated into the amount of total impairment related to the credit loss and the amount of the total impairment related to all other factors. The amount of the total OTTI related to the credit loss is recognized in earnings. The amount of the total impairment related to all other factors is recognized in OCI.

For the three and six months ended June 30, 2015 and 2014, the Company determined that no securities experienced credit losses.

There is no OTTI balance recognized in comprehensive income as of June 30, 2015 and 2014.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The estimated fair value of the Company’s financial instruments is as follows: 

	June 30, 2015
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,478,234	$	169,899	$	1,297,531	$	10,804	$	1,478,234
Trading	1,701		—		1,701		—		1,701
Derivative assets	198		—		198		—		198
Loans, net	10,245,566		—		9,891,399		137,222		10,028,621
Accrued interest receivable	46,222		—		46,222		—		46,222
Financial liabilities:
Deposits	$	11,406,728	$	—	$	11,410,560	$	—	$	11,410,560
Customer repurchases	42,172		—		42,172		—		42,172
FHLB and FRB advances	11,051		—		11,051		—		11,051
Other borrowed funds	58,378		—		—		58,637		58,637
Qualifying debt	208,417		—		—		209,019		209,019
Derivative liabilities	49,037		—		49,037		—		49,037
Accrued interest payable	11,764		—		11,764		—		11,764

	December 31, 2014
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
AFS	$	1,520,237	$	144,646	$	1,364,146	$	11,445	$	1,520,237
Trading	1,858		—		1,858		—		1,858
Derivative assets	7		—		7		—		7
Loans, net	8,288,049		—		7,984,692		152,182		8,136,874
Accrued interest receivable	36,705		—		36,705		—		36,705
Financial liabilities:
Deposits	$	8,931,043	$	—	$	8,935,566	$	—	$	8,935,566
Customer repurchases	54,899		—		54,899		—		54,899
FHLB and FRB advances	307,081		—		307,081		—		307,081
Other borrowed funds	83,182		—		25,000		61,074		86,074
Junior subordinated debt	40,437		—		—		40,437		40,437
Derivative liabilities	57,820		—		57,820		—		57,820
Accrued interest payable	9,890		—		9,890		—		9,890

Interest rate risk

The Company assumes interest rate risk (the risk to the Company’s earnings and capital from changes in interest rate levels) as a result of its normal operations. As a result, the fair values of the Company’s financial instruments as well as its future net interest income will change when interest rate levels change and that change may be either favorable or unfavorable to the Company.

Interest rate risk exposure is measured using interest rate sensitivity analysis to determine our change in EVE and net interest income resulting from hypothetical changes in interest rates. If potential changes to EVE and net interest income resulting from hypothetical interest rate changes are not within the limits established by the BOD, the BOD may direct management to adjust the asset and liability mix to bring interest rate risk within BOD-approved limits. As of June 30, 2015, the Company’s interest rate risk profile was within BOD-approved limits.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to prohibit an interest rate risk profile that does not conform to both management and BOD risk tolerances. There is also ALCO reporting at the Parent company level for reviewing interest rate risk for the Company, which gets reported to the BOD and the Finance and Investment Committee.

Fair value of commitments

The estimated fair value of standby letters of credit outstanding at June 30, 2015 and December 31, 2014 was insignificant. Loan commitments on which the committed interest rates were less than the current market rate were also insignificant at June 30, 2015 and December 31, 2014.

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Carrying Amounts and Fair Values of Investment Securities

The carrying amounts and fair values of investment securities at June 30, 2015 and December 31, 2014 are summarized as follows: 

	June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	50	$	10,754	$	—		$	10,804
Commercial MBS issued by GSEs	13,145		64		—			13,209
Corporate debt securities	13,097		568		—			13,665
CRA investments	32,599		—		(62		)	32,537
Municipal obligations	281,895		10,889		(371		)	292,413
Preferred stock	82,888		1,935		(1,772		)	83,051
Private label commercial MBS	4,908		71		—			4,979
Private label residential MBS	102,760		250		(939		)	102,071
Residential MBS issued by GSEs	861,681		11,297		(1,621		)	871,357
Trust preferred securities	32,000		—		(6,352		)	25,648
U.S. government sponsored agency securities	24,906		—		(297		)	24,609
U.S. treasury securities	3,891		—		—			3,891
Total AFS securities	$	1,453,820	$	35,828	$	(11,414	)	$	1,478,234
Securities measured at fair value
Residential MBS issued by GSEs								$	1,701

	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
Available-for-sale
Collateralized debt obligations	$	50	$	11,395	$	—		$	11,445
Commercial MBS issued by GSEs	2,047		100		—			2,147
Corporate debt securities	52,773		717		(1,001		)	52,489
CRA investments	24,302		30		—			24,332
Municipal obligations	285,398		13,688		(49		)	299,037
Mutual funds	37,449		500		(247		)	37,702
Preferred stock	83,192		2,099		(2,679		)	82,612
Private label commercial MBS	5,017		132		—			5,149
Private label residential MBS	70,985		379		(1,121		)	70,243
Residential MBS issued by GSEs	881,734		11,440		(1,985		)	891,189
Trust preferred securities	32,000		—		(6,454		)	25,546
U.S. government-sponsored agency securities	18,701		—		(355		)	18,346
Total AFS securities	$	1,493,648	$	40,480	$	(13,891	)	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs								$	1,858

Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position

Information pertaining to securities with gross unrealized losses at June 30, 2015 and December 31, 2014, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	June 30, 2015
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
CRA investments	$	62	$	24,446	$	—	$	—	$	62	$	24,446
Municipal obligations	371		20,722		—		—		371		20,722
Preferred stock	513		16,791		1,259		17,798		1,772		34,589
Private label residential MBS	365		31,789		574		22,920		939		54,709
Residential MBS issued by GSEs	655		116,929		966		43,114		1,621		160,043
Trust preferred securities	—		—		6,352		25,648		6,352		25,648
U.S. government sponsored agency securities	—		—		297		18,403		297		18,403
Total AFS securities	$	1,966	$	210,677	$	9,448	$	127,883	$	11,414	$	338,560

	December 31, 2014
	Less Than Twelve Months				More Than Twelve Months				Total
	Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value		Gross Unrealized Losses		Fair Value
	(in thousands)
Available-for-sale
Corporate debt securities	$	139	$	9,860	$	862	$	29,139	$	1,001	$	38,999
Municipal obligations	—		—		49		4,430		49		4,430
Mutual funds	247		25,855		—		—		247		25,855
Preferred stock	232		13,811		2,447		28,109		2,679		41,920
Private label residential MBS	157		24,056		964		26,614		1,121		50,670
Residential MBS issued by GSEs	227		49,217		1,758		97,296		1,985		146,513
Trust preferred securities	—		—		6,454		25,546		6,454		25,546
U.S. government sponsored agency securities	—		—		355		18,346		355		18,346
Total AFS securities	$	1,002	$	122,799	$	12,889	$	229,480	$	13,891	$	352,279

Amortized Cost and Fair Value of Investment Securities by Contractual Maturities

The amortized cost and fair value of securities as of June 30, 2015, by contractual maturities, are shown below. MBS are shown separately as individual MBS are comprised of pools of loans with varying maturities. Therefore, these securities are listed separately in the maturity summary. 

	June 30, 2015
	Amortized Cost		Estimated Fair Value
	(in thousands)
Available-for-sale
Due in one year or less	$	45,871	$	45,989
After one year through five years	68,992		71,415
After five years through ten years	102,814		105,800
After ten years	253,649		263,414
Mortgage-backed securities	982,494		991,616
Total AFS securities	$	1,453,820	$	1,478,234

Investment Securities by Credit Rating Type

The following tables summarize the carrying amount of the Company’s investment ratings position as of June 30, 2015 and December 31, 2014: 

	June 30, 2015
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	10,804	$	—	$	10,804
Commercial MBS issued by GSEs	—		13,209		—		—		—		—		—		13,209
Corporate debt securities	—		—		2,748		10,591		—		—		326		13,665
CRA investments	—		—		—		—		—		—		32,537		32,537
Municipal obligations	9,284		—		145,706		131,055		6,183		185		—		292,413
Preferred stock	—		—		—		—		55,223		18,062		9,766		83,051
Private label commercial MBS	4,979		—		—		—		—		—		—		4,979
Private label residential MBS	70,856		—		181		11,434		15,969		3,488		143		102,071
Residential MBS issued by GSEs	—		871,357		—		—		—		—		—		871,357
Trust preferred securities	—		—		—		—		25,648		—		—		25,648
U.S. government sponsored agency securities	—		24,609		—		—		—		—		—		24,609
U.S. treasury securities	—		3,891		—		—		—		—		—		3,891
Total AFS securities (1)	$	85,119	$	913,066	$	148,635	$	153,080	$	103,023	$	32,539	$	42,772	$	1,478,234
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,701	$	—	$	—	$	—	$	—	$	—	$	1,701

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

	December 31, 2014
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Available-for-sale
Collateralized debt obligations	$	—	$	—	$	—	$	—	$	—	$	11,445	$	—	$	11,445
Commercial MBS issued by GSEs	—		2,147		—		—		—		—		—		2,147
Corporate debt securities	—		—		2,759		5,570		44,160		—		—		52,489
CRA investments	—		—		—		—		—		—		24,332		24,332
Municipal obligations	8,168		—		138,256		146,155		6,263		195		—		299,037
Mutual funds (2)	—		—		—		—		37,702		—		—		37,702
Preferred stock	—		—		—		—		54,585		17,632		10,395		82,612
Private label commercial MBS	5,149		—		—		—		—		—		—		5,149
Private label residential MBS	59,944		—		68		3,439		3,595		3,197		—		70,243
Residential MBS issued by GSEs	—		891,189		—		—		—		—		—		891,189
Trust preferred securities	—		—		—		—		25,546		—		—		25,546
U.S. government sponsored agency securities	—		18,346		—		—		—		—		—		18,346
Total AFS securities (1)	$	73,261	$	911,682	$	141,083	$	155,164	$	171,851	$	32,469	$	34,727	$	1,520,237
Securities measured at fair value
Residential MBS issued by GSEs	$	—	$	1,858	$	—	$	—	$	—	$	—	$	—	$	1,858

(1) The Company uses the average credit rating of the combination of S&P, Moody’s, and Fitch, where ratings differ.

(2) At least 80% of mutual funds are investment grade corporate debt securities.

Gross Gains and (Losses) on Sales of Investment Securities

The following table presents gross gains and losses on sales of investment securities: 

	Three Months Ended June 30,					Six Months Ended June 30,
	2015		2014			2015			2014
	(in thousands)
Gross gains	$	55	$	—		$	1,103		$	366
Gross losses	—		(163		)	(459		)	(163		)
Net gains on sales of investment securities	$	55	$	(163	)	$	644		$	203

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Fair Value Accounting - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions		3 Months Ended	6 Months Ended	12 Months Ended
		Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014	Mar. 31, 2015	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans	[1]	$ 106,369	$ 106,369	$ 124,928
Impaired loans with an allowance recorded	[2]	(7,157)	(7,157)	(10,765)
Repossessed Assets		59,335	59,335	57,150	$ 63,759	$ 59,292	$ 56,450	$ 66,719
Other assets acquired through foreclosure		$ 59,300	59,300	57,100		$ 59,300
Collateralized debt obligations [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities contained credit losses		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans		$ 106,400	106,400	124,900
Impaired loans with an allowance recorded		$ (7,200)	$ (7,200)	$ (10,800)
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt, Input Value			4.972%	6.242%
Period of basis point spread		3 months		3 months
Percentage of LIBOR			0.283%	0.256%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans		$ 99,212	$ 99,212	$ 114,163
Repossessed Assets		59,300	59,300
Other assets acquired through foreclosure		59,335	59,335	57,150
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans		99,212	99,212	114,163
Other assets acquired through foreclosure		$ 59,335	$ 59,335	$ 57,150

[1] Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

[2] Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

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Loans, Leases and Allowance for Credit Losses - Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Trade and Loans Receivables Held-for-sale, Net, Not Part of Disposal Group	$ 39,401	$ 0
Net deferred loan fees and costs	(14,000)	(12,500)
Loans, net of deferred loan fees and costs	10,321,221	8,398,265	$ 7,544,500
Allowance for credit losses	(115,056)	(110,216)	(105,900)
Loans, net	10,206,165	8,288,049	$ 7,438,600
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	4,576,303	3,326,708
Commercial Real Estate Non Owner Occupied Multi Family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	2,195,018	2,052,566
Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	2,019,280	1,732,888
Allowance for credit losses	(13,014)	(12,454)
Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	1,002,698	748,053
Allowance for credit losses	(19,537)	(18,558)
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	320,591	299,402
Allowance for credit losses	(6,399)	(7,456)
Leases [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	183,378	205,639
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	23,953	33,009
Allowance for credit losses	$ (585)	$ (853)

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Mergers, Acquisitions and Dispositions Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Business Acquisition [Line Items]
Cash Payment for Vested Stock Options	$ 6,200	$ 6,200
Business Combination, Acquisition Related Costs		600
Business Combination, Fair Market Value Adjustment on Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	(6,240)	(6,240)		$ 0
Business Combination, Acquired Receivables, Fair Value	1,447,135	1,447,135
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,761,951	1,761,951	$ 0
Cash Acquired from Acquisition	342,427	342,427	$ 0
Goodwill	282,851	282,851		$ 23,224
Defined Benefit Pension Plan, Liabilities	$ 7,100	$ 7,100
Common Stock, Shares, Issued	102,290,865	102,290,865		88,691,249
Bridge Capital Holdings [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents	$ 378,966	$ 378,966
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Marketable Securities	61,349	61,349
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Stock Investment	7,015	7,015
Business Combination, Acquired Receivables, Fair Value	1,447,135	1,447,135
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment	1,931	1,931
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	14,997	14,997
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent	14,261	14,261
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	19,656	19,656
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Acquired Excluding Goodwill	1,969,893	1,969,893
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	8,633	8,633
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,761,951	1,761,951
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	420,354
Business Combination, Consideration Transferred, Liabilities Incurred	10,676
Payments to Acquire Businesses, Gross	36,539
Business Combination, Consideration Transferred	467,569
Goodwill	259,627	259,627
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Repossessed Assets	1,550	1,550
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Bank Owned Life Insurance	17,385	17,385
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Investment in Low Income Housing Tax Credits	5,648	5,648
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits	1,742,031	1,742,031
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Junior Subordinated Debt	$ 11,287	$ 11,287		$ 0
Common Stock, Shares, Issued	12,451,240	12,451,240
Commercial and industrial [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	$ 1,091,032	$ 1,091,032
Acquired Non-Purchased Credit Impaired Loans [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	1,434,961	1,434,961
Interest Rate and Credit Marks on Acquired Loans	23,000	23,000
Acquired Non-Purchased Credit Impaired Loans [Member] | Commercial and industrial [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	1,082,413	1,082,413
Receivables Acquired with Deteriorated Credit Quality [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	12,174	12,174
Interest Rate and Credit Marks on Acquired Loans	2,100	2,100
Receivables Acquired with Deteriorated Credit Quality [Member] | Commercial and industrial [Member]
Business Acquisition [Line Items]
Business Combination, Acquired Receivables, Fair Value	$ 8,619	$ 8,619

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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 34,719	$ 35,538	$ 74,909	$ 66,623
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	8,976	0	8,976
Other comprehensive income (loss), net:
Unrealized (loss) gain on AFS securities, net of tax effect of $5,135, $(6,294), $858, and $(12,658), respectively	(8,378)	10,525	(1,225)	21,169
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	337	0	337	0
Realized (gain) loss on sale of AFS securities included in income, net of tax effect of $21, $(61), $241, and $76, respectively	(34)	102	(403)	(127)
Net other comprehensive (loss) income	(8,075)	19,603	(1,291)	30,018
Comprehensive income	$ 26,644	$ 55,141	$ 73,618	$ 96,641

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Commitments and Contingencies - Contractual Commitments for Lines and Letters of Credit by Maturity (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Loss Contingencies [Line Items]
Total Amount Committed	$ 3,361,502	$ 2,256,117
Commitments to extend credit [Member]
Loss Contingencies [Line Items]
Total Amount Committed	3,230,537	2,164,523
Credit card guarantees [Member]
Loss Contingencies [Line Items]
Total Amount Committed	57,452	42,038
Standby letters of credit [Member]
Loss Contingencies [Line Items]
Total Amount Committed	$ 73,513	$ 49,556

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Mergers, Acquisitions and Dispositions

6 Months Ended

Jun. 30, 2015

Business Combinations [Abstract]

Mergers, Acquisitions and Dispositions

Acquisition of Bridge Capital Holdings

On June 30, 2015, the Company completed its acquisition of Bridge Capital Holdings and its wholly-owned subsidiary, Bridge Bank, headquartered in San Jose, California. Under the terms of the acquisition, each outstanding share of Bridge common stock was exchanged for 0.8145 shares of WAL's common stock plus $2.39 in cash. The Company paid $36.5 million in cash and issued 12.5 million common shares for all equity interests in Bridge. The merger was undertaken, in part, because Bridge strengthens the Company's Northern California presence and provides new avenues for growth in technology and international services.

Bridge’s results of operations will be included in the Company’s results beginning July 1, 2015. Acquisition / restructure expenses related to the Bridge acquisition of $7.8 million and $8.0 million for three and six months ended June 30, 2015, respectively, have been included in non-interest expense, of which, approximately $0.6 million are acquisition related costs as defined by ASC 805. The acquisition was accounted for under the acquisition method of accounting in accordance with ASC 805. Assets purchased and liabilities assumed were recorded at their respective acquisition date estimated fair values. The fair values of assets acquired and liabilities assumed are subject to adjustment during the first twelve months after the acquisition date if additional information becomes available to indicate a more accurate or appropriate value for an asset or liability. As the acquisition was completed at quarter end, the fair values of substantially all of the net assets are considered preliminary.

The Company merged Bridge Bank into WAB effective June 30, 2015, creating combined assets for the resulting bank of $13.47 billion and deposits of $11.41 billion. The recognized amounts of identifiable assets acquired and liabilities assumed are as follows:

	June 30, 2015
	(in thousands)
Assets:
Cash and cash equivalents (1)	$	378,966
Investment securities - AFS	61,349
Investments in restricted stock	7,015
Loans	1,447,135
Premises and equipment	1,931
Other assets acquired through foreclosure	1,550
Bank owned life insurance	17,385
Investment in LIHTC	5,648
Intangible assets	14,997
Deferred tax assets, net	14,261
Other assets	19,656
Total assets	$	1,969,893
Liabilities:
Deposits	$	1,742,031
Qualifying debt	11,287
Other liabilities	8,633
Total liabilities	1,761,951
Net assets acquired	$	207,942
Consideration paid
Common stock (12,451,240 shares at $33.76 per share)	$	420,354
Fair value of equity awards related to pre-combination vesting	10,676
Cash	36,539
Fair value of total consideration	467,569
Goodwill	$	259,627

(1) Cash and cash equivalents is net of a $6.2 million payment made by Bridge related to the cash out of vested, unexercised stock options at the date of closing. Cash acquired, less cash consideration paid of $36.5 million, resulted in net cash and cash equivalents increasing by $342.4 million following the acquisition.

Loans acquired in the Bridge acquisition consist of loans that are not considered impaired (non-PCI loans) and loans that have shown evidence of credit deterioration since origination (PCI loans) as of the acquisition date. All loans were recorded net of fair value adjustments (interest rate and credit marks), which were determined using discounted contractual cash flow models. The fair value of non-PCI loans acquired totals $1.43 billion, which is net of interest and credit marks of $23.0 million. The fair value of PCI loans totals $12.2 million, which is net of interest and credit marks of $2.1 million. See "Note 4. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements for additional detail of the acquired loans.

In connection with the Bridge acquisition, the Company acquired intangible assets of $15.0 million, consisting primarily of core deposit intangibles. The core deposit intangible asset balance has been allocated to the Northern California and CBL segments based on their respective core deposit balances at June 30, 2015, and is subject to amortization over its estimated useful life of 10 years.

Goodwill in the amount of $259.6 million was recognized as a result of the acquisition, none of which is expected to be deductible for income tax purposes. Goodwill has been allocated to the newly formed Northern California and CBL segments based on their proportionate loan and deposit balances as of June 30, 2015. Management believes this methodology allocates goodwill to the reporting units in a manner consistent with the expected synergies of the combination.

Qualifying debt assumed from Bridge is comprised of junior subordinated debt with a contractual balance of $17.5 million and is recorded net of a $6.2 million fair value mark that will be amortized over the remaining life of the trusts. See "Note 7. Qualifying Debt" of these Notes to Unaudited Consolidated Financial Statements for further detail and discussion of the debt.

In connection with the acquisition, the Company assumed Bridge's SERP, an unfunded noncontributory defined benefit pension plan. The SERP provides retirement benefits to certain Bridge executives based on years of service and final average salary. Pursuant to the terms of the SERP agreements, if the executive officer's service is terminated by Bridge or by the executive officer for "good reason" (as defined in the SERP agreements) within 24 months following a change in control, such as the Bridge acquisition, the executive officer is entitled to full vesting of the normal benefit under the SERP agreement, and such SERP benefits will be made in installment payments commencing on the first business day of January of the year following the executive officer's attainment of age 55 or, if the executive officer is already age 55 as of such termination of employment, on the first business day of January of the year following the executive officer's termination of employment. As of June 30, 2015, a $7.1 million liability included in other liabilities was recorded in the Company's Consolidated Balance Sheet related to the SERP. A discount rate of 5.75% and a 4.00% employee compensation rate increase were used in determining the SERP liability as of June 30, 2015.

The following table presents pro forma information as if the Bridge acquisition was completed on January 1, 2014. The pro forma information includes adjustments for interest income on loans and securities acquired, amortization of intangibles arising from the transaction and interest expense on deposits acquired. The pro forma information is not necessarily indicative of the results of operations as they would have been had the transactions been effected on the assumed dates. 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands, except per share amounts)
Interest income	$	139,080	$	121,744	$	271,502	$	239,072
Non-interest income	1,840		9,578		11,047		16,882
Net income available to common stockholders (1)	45,607		39,452		90,372		73,901
Earnings per share - basic	$	0.45	$	0.40	$	0.89	$	0.74
Earnings per share - diluted	$	0.44	$	0.39	$	0.88	$	0.73

(1) Excludes acquisition / restructure related costs incurred by the Company of $7.8 million and $8.0 million for the three and six months ended June 30, 2015, respectively, and acquisition / restructure related costs incurred by Bridge of $5.6 million and $6.8 million for the three and six months ended June 30, 2015, respectively, and related tax effects.

PartnersFirst Discontinued Operations

The Company discontinued its affinity credit card business and presented these activities as discontinued operations. During the second quarter 2014, the Company shut down its remaining affinity credit card operations. Therefore, no additional discontinued operations have been reported.

The following table summarizes the operating results of the discontinued operations for the three and six months ended June 30, 2014: 

	Three Months Ended June 30, 2014			Six Months Ended June 30, 2014
	(in thousands)
Operating revenue	$	(214	)	$	(358	)
Non-interest expenses	(511		)	(1,369		)
Loss before income taxes	(725		)	(1,727		)
Income tax benefit	(221		)	(569		)
Net loss	$	(504	)	$	(1,158	)

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Loans, Leases and Allowance for Credit Losses - Interest Income on Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	$ 1,126	$ 1,435	$ 2,310	$ 2,821
Owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	406	374	827	765
Non-owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	360	402	690	775
Multi-family [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	0	0	0
Commercial [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	60	184	139	377
Leases [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	0	0	0
Construction [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	0	0	0
Land [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	197	295	392	556
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	102	160	259	317
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	$ 1	$ 20	$ 3	$ 31

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Derivatives and Hedging Additional Information (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Largest gross exposure (positive derivative NPV) to an individual counterparty	$ 198	$ 7	$ 0
Negative NPVs	49,037	57,820	29,127
Collateral netted against derivative liabilities	46,700	57,800	29,200
Over collateralization net position	18,000	$ 14,200	$ 17,500
Additional collateral held in securities	$ 64,600

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Other Borrowings - Company's Borrowings (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Short Term
Revolving line of credit	$ 0	$ 25,000
FHLB advances	11,051	96,987
Other Long-term Debt, Current	58,378	58,182
Short-term Debt	69,429	180,169
Long Term
Long-term Debt	0	210,094
FHLB [Member]
Long Term
Long-term Debt	$ 0	$ 210,094

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Loans, Leases and Allowance for Credit Losses (Tables)

6 Months Ended

Jun. 30, 2015

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]

Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Table Text Block]

	June 30, 2015
	Commercial and Industrial		Commercial Real Estate		Construction and Land Development		Residential Real Estate		Consumer		Total
	(in thousands)
Contractually required principal payments:
Loans with credit deterioration since origination	$	10,229	$	1,625	$	—	$	2,455	$	—	$	14,309
Purchased non-credit impaired loans	1,098,965		235,206		99,025		23,797		938		1,457,931
Total loans acquired	1,109,194		236,831		99,025		26,252		938		1,472,240
Cash flows expected to be collected:
Loans with credit deterioration since origination	9,613		1,496		—		2,087		—		13,196
Purchased non-credit impaired loans	1,170,869		302,186		102,018		26,865		1,169		1,603,107
Total loans acquired	1,180,482		303,682		102,018		28,952		1,169		1,616,303
Fair value of loans acquired:
Loans with credit deterioration since origination	8,619		1,480		—		2,075		—		12,174
Purchased non-credit impaired loans	1,082,413		229,470		99,078		23,069		931		1,434,961
Total loans acquired	$	1,091,032	$	230,950	$	99,078	$	25,144	$	931	$	1,447,135

Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses

The composition of the Company’s loan portfolio is as follows: 

	June 30, 2015			December 31, 2014
	(in thousands)
Loans, held for investment
Commercial and industrial	$	4,576,303		$	3,326,708
Commercial real estate - non-owner occupied	2,195,018			2,052,566
Commercial real estate - owner occupied	2,019,280			1,732,888
Construction and land development	1,002,698			748,053
Residential real estate	320,591			299,402
Commercial leases	183,378			205,639
Consumer	23,953			33,009
Loans, net of deferred loan fees and costs	10,321,221			8,398,265
Allowance for credit losses	(115,056		)	(110,216		)
Total loans HFI	$	10,206,165		$	8,288,049

Contractual Aging of Loan Portfolio by Class of Loans Including Loans Held for Sale and Excluding Deferred Fees/Costs

The following table presents the contractual aging of the recorded investment in past due loans held for investment by class of loans:

	June 30, 2015
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	2,018,462	$	343	$	—	$	475	$	818	$	2,019,280
Non-owner occupied	2,000,579		181		—		3,626		3,807		2,004,386
Multi-family	190,207		—		—		425		425		190,632
Commercial and industrial
Commercial	4,566,978		1,692		1,239		6,394		9,325		4,576,303
Leases	183,378		—		—		—		—		183,378
Construction and land development
Construction	597,059		—		—		—		—		597,059
Land	404,356		—		—		1,283		1,283		405,639
Residential real estate	310,628		169		151		9,643		9,963		320,591
Consumer	23,515		13		219		206		438		23,953
Total loans	$	10,295,162	$	2,398	$	1,609	$	22,052	$	26,059	$	10,321,221

	December 31, 2014
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,730,164	$	1,406	$	180	$	1,138	$	2,724	$	1,732,888
Non-owner occupied	1,855,454		2,389		3,361		8,737		14,487		1,869,941
Multi-family	182,180		—		445		—		445		182,625
Commercial and industrial
Commercial	3,324,132		1,523		15		1,038		2,576		3,326,708
Leases	205,639		—		—		—		—		205,639
Construction and land development
Construction	388,399		—		—		—		—		388,399
Land	356,209		—		2,640		805		3,445		359,654
Residential real estate	292,065		2,347		205		4,785		7,337		299,402
Consumer	32,540		177		21		271		469		33,009
Total loans	$	8,366,782	$	7,842	$	6,867	$	16,774	$	31,483	$	8,398,265

Summary of Recorded Investment in Nonaccrual Loans and Loans Past Due 90 Days Still Accruing Interest by Loan Class

The following table presents the recorded investment in non-accrual loans and loans past due ninety days or more and still accruing interest by class of loans: 

	June 30, 2015								December 31, 2014
	Non-accrual loans						Loans past due 90 days or more and still accruing		Non-accrual loans						Loans past due 90 days or more and still accruing
	Current		Past Due/ Delinquent		Total Non-accrual				Current		Past Due/ Delinquent		Total Non-accrual
	(in thousands)
Commercial real estate
Owner occupied	$	10,090	$	—	$	10,090	$	474	$	13,630	$	—	$	13,630	$	1,138
Non-owner occupied	26,756		2,769		29,525		858		30,226		8,601		38,827		2,171
Multi-family	—		—		—		425		—		—		—		—
Commercial and industrial
Commercial	809		2,241		3,050		4,153		2,621		496		3,117		703
Leases	3,930		—		3,930		—		373		—		373		—
Construction and land development
Construction	—		—		—		—		—		—		—		—
Land	2,516		—		2,516		1,283		2,686		2,640		5,326		805
Residential real estate	1,556		8,561		10,117		1,082		1,332		4,841		6,173		232
Consumer	—		197		197		9		25		188		213		83
Total	$	45,657	$	13,768	$	59,425	$	8,284	$	50,893	$	16,766	$	67,659	$	5,132

Loans by Risk Rating

The following tables present gross loans by risk rating: 

	June 30, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,957,152	$	33,347	$	28,071	$	710	$	—	$	2,019,280
Non-owner occupied	1,932,983		20,676		50,727		—		—		2,004,386
Multi-family	188,894		—		1,738		—		—		190,632
Commercial and industrial
Commercial	4,473,382		66,656		36,265		—		—		4,576,303
Leases	173,634		5,793		3,951		—		—		183,378
Construction and land development
Construction	594,752		2,307		—		—		—		597,059
Land	385,659		374		19,606		—		—		405,639
Residential real estate	299,941		2,288		18,362		—		—		320,591
Consumer	23,318		377		258		—		—		23,953
Total	$	10,029,715	$	131,818	$	158,978	$	710	$	—	$	10,321,221

	June 30, 2015
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	10,027,949	$	129,876	$	136,627	$	710	$	—	$	10,295,162
Past due 30 - 59 days	1,330		769		299		—		—		2,398
Past due 60 - 89 days	436		1,173		—		—		—		1,609
Past due 90 days or more	—		—		22,052		—		—		22,052
Total	$	10,029,715	$	131,818	$	158,978	$	710	$	—	$	10,321,221

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial real estate
Owner occupied	$	1,664,270	$	28,072	$	39,222	$	1,324	$	—	$	1,732,888
Non-owner occupied	1,771,138		35,752		62,611		440		—		1,869,941
Multi-family	182,180		—		445		—		—		182,625
Commercial and industrial
Commercial	3,295,027		14,380		17,146		155		—		3,326,708
Leases	202,772		2,494		373		—		—		205,639
Construction and land development
Construction	383,677		4,241		481		—		—		388,399
Land	328,278		10,289		21,087		—		—		359,654
Residential real estate	284,052		2,044		13,306		—		—		299,402
Consumer	32,419		233		357		—		—		33,009
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

	December 31, 2014
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	8,140,140	$	95,091	$	129,787	$	1,764	$	—	$	8,366,782
Past due 30 - 59 days	2,771		198		4,718		155		—		7,842
Past due 60 - 89 days	385		37		6,445		—		—		6,867
Past due 90 days or more	517		2,179		14,078		—		—		16,774
Total	$	8,143,813	$	97,505	$	155,028	$	1,919	$	—	$	8,398,265

Recorded Investment in Loans Classified as Impaired

The following table presents the average investment in impaired loans and income recognized on impaired loans: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Average balance on impaired loans	$	155,943	$	167,326	$	159,186	$	170,010
Interest income recognized on impaired loans	1,126		1,435		2,310		2,821
Interest recognized on non-accrual loans, cash basis	548		566		1,201		1,172

The table below reflects the recorded investment in loans classified as impaired: 

	June 30, 2015			December 31, 2014
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	106,369		$	124,928
Impaired loans without a specific valuation allowance under ASC 310 (2)	44,780			41,822
Total impaired loans	$	151,149		$	166,750
Valuation allowance related to impaired loans (3)	$	(7,157	)	$	(10,765	)

(1) Includes TDR loans with a specific valuation allowance under ASC 310 of $92.7 million and $103.3 million at June 30, 2015 and December 31, 2014, respectively.

(2) Includes TDR loans without a specific valuation allowance under ASC 310 of $30.1 million and $35.0 million at June 30, 2015 and December 31, 2014, respectively.

(3) Includes valuation allowance related to TDR loans of $5.6 million and $8.9 million at June 30, 2015 and December 31, 2014, respectively.

Impaired Loans by Loan Class

The following table presents impaired loans by class: 

	June 30, 2015		December 31, 2014
	(in thousands)
Commercial real estate
Owner occupied	$	34,336	$	44,893
Non-owner occupied	59,025		66,324
Multi-family	—		—
Commercial and industrial
Commercial	11,806		13,749
Leases	3,930		373
Construction and land development
Construction	—		—
Land	19,117		21,748
Residential real estate	22,611		19,300
Consumer	324		363
Total	$	151,149	$	166,750

Average Investment in Impaired Loans by Loan Class

The following table presents average investment in impaired loans by loan class: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	38,750	$	34,341	$	40,839	$	35,545
Non-owner occupied	59,873		68,725		62,636		69,382
Multi-family	—		—		—		—
Commercial and industrial
Commercial	12,401		15,438		12,835		15,510
Leases	4,879		419		2,618		429
Construction and land development
Construction	—		—		—		—
Land	19,834		20,291		20,523		21,438
Residential real estate	19,838		27,607		19,375		27,203
Consumer	368		505		360		503
Total	$	155,943	$	167,326	$	159,186	$	170,010

Interest Income on Impaired Loans by Loan Class

The following table presents interest income on impaired loans by class: 

	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
	(in thousands)
Commercial real estate
Owner occupied	$	406	$	374	$	827	$	765
Non-owner occupied	360		402		690		775
Multi-family	—		—		—		—
Commercial and industrial
Commercial	60		184		139		377
Leases	—		—		—		—
Construction and land development
Construction	—		—		—		—
Land	197		295		392		556
Residential real estate	102		160		259		317
Consumer	1		20		3		31
Total	$	1,126	$	1,435	$	2,310	$	2,821

Tabular Disclosure of Nonperforming Assets

The following table summarizes nonperforming assets: 

	June 30, 2015		December 31, 2014
	(in thousands)
Non-accrual loans (1)	$	59,425	$	67,659
Loans past due 90 days or more on accrual status	8,284		5,132
Troubled debt restructured loans (2)	80,192		84,720
Total nonperforming loans	147,901		157,511
Other assets acquired through foreclosure, net	59,335		57,150
Total nonperforming assets	$	207,236	$	214,661

(1) Includes non-accrual TDR loans of $42.6 million and $53.6 million at June 30, 2015 and December 31, 2014, respectively.

(2) Includes accruing TDR loans only.

Accretable Yield Table

Changes in the accretable yield for loans acquired with deteriorated credit quality in the Centennial, Western Liberty, and Bridge acquisitions are as follows: 

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(in thousands)
Balance, at beginning of period	$	17,956		$	26,831		$	19,156		$	28,164
Additions due to acquisition of Bridge	857			—			857			—
Reclassifications from non-accretable to accretable yield (1)	265			1,564			695			3,030
Accretion to interest income	(1,012		)	(1,798		)	(2,090		)	(4,202		)
Reversal of fair value adjustments upon disposition of loans	(876		)	(3,414		)	(1,428		)	(3,809		)
Balance, at end of period	$	17,190		$	23,183		$	17,190		$	23,183

(1) The primary drivers of reclassification from non-accretable to accretable yield resulted from changes in estimated cash flows.

Allowances for Credit Losses

The following table summarizes the changes in the allowance for credit losses by portfolio type: 

	Three Months Ended June 30,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	17,999		$	28,111		$	6,666		$	58,651		$	671		$	112,098
Charge-offs	—			—			(218		)	(1,771		)	(53		)	(2,042		)
Recoveries	1,373			1,738			1,184			681			24			5,000
Provision	165			(903		)	(1,233		)	2,028			(57		)	—
Ending balance	$	19,537		$	28,946		$	6,399		$	59,589		$	585		$	115,056
2014
Beginning Balance	$	16,700		$	34,853		$	11,297		$	39,493		$	1,556		$	103,899
Charge-offs	(78		)	(330		)	(523		)	(1,038		)	(5		)	(1,974		)
Recoveries	498			1,248			314			1,254			191			3,505
Provision	(247		)	(1,422		)	(861		)	3,152			(115		)	507
Ending balance	$	16,873		$	34,349		$	10,227		$	42,861		$	1,627		$	105,937

	Six Months Ended June 30,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2015
Beginning Balance	$	18,558		$	28,783		$	7,456		$	54,566		$	853		$	110,216
Charge-offs	—			—			(618		)	(2,164		)	(107		)	(2,889		)
Recoveries	1,530			2,121			1,717			1,597			64			7,029
Provision	(551		)	(1,958		)	(2,156		)	5,590			(225		)	700
Ending balance	$	19,537		$	28,946		$	6,399		$	59,589		$	585		$	115,056
2014
Beginning Balance	$	14,519		$	32,064		$	11,640		$	39,657		$	2,170		$	100,050
Charge-offs	(78		)	(501		)	(929		)	(2,516		)	(17		)	(4,041		)
Recoveries	709			1,808			867			2,176			361			5,921
Provision	1,723			978			(1,351		)	3,544			(887		)	4,007
Ending balance	$	16,873		$	34,349		$	10,227		$	42,861		$	1,627		$	105,937

The following table presents impairment method information related to loans and allowance for credit losses by loan portfolio segment: 

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of June 30, 2015:
Recorded Investment:
Impaired loans with an allowance recorded	$	19,274	$	43,135	$	11,805	$	13,477	$	18,542	$	10	$	126	$	106,369
Impaired loans with no allowance recorded	15,062		15,889		2		9,134		576		3,920		197		44,780
Total loans individually evaluated for impairment	34,336		59,024		11,807		22,611		19,118		3,930		323		151,149
Loans collectively evaluated for impairment	1,967,622		2,068,457		4,555,653		293,200		983,580		179,448		23,630		10,071,590
Loans acquired with deteriorated credit quality	17,322		67,537		8,843		4,780		—		—		—		98,482
Total recorded investment	$	2,019,280	$	2,195,018	$	4,576,303	$	320,591	$	1,002,698	$	183,378	$	23,953	$	10,321,221
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	21,847	$	43,929	$	12,235	$	17,196	$	18,659	$	10	$	139	$	114,015
Impaired loans with no allowance recorded	15,349		15,954		2		10,026		765		4,071		197		46,364
Total loans individually evaluated for impairment	37,196		59,883		12,237		27,222		19,424		4,081		336		160,379
Loans collectively evaluated for impairment	1,967,622		2,068,457		4,555,653		293,200		983,580		179,448		23,630		10,071,590
Loans acquired with deteriorated credit quality	23,124		95,187		11,151		5,852		—		—		—		135,314
Total unpaid principal balance	$	2,027,942	$	2,223,527	$	4,579,041	$	326,274	$	1,003,004	$	183,529	$	23,966	$	10,367,283
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	1,330	$	2,004	$	1,685	$	717	$	1,416	$	1	$	4	$	7,157
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	1,330		2,004		1,685		717		1,416		1		4		7,157
Loans collectively evaluated for impairment	11,684		13,891		55,363		5,682		18,121		2,540		581		107,862
Loans acquired with deteriorated credit quality	—		37		—		—		—		—		—		37
Total allowance for credit losses	$	13,014	$	15,932	$	57,048	$	6,399	$	19,537	$	2,541	$	585	$	115,056

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Commercial Leases		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2014:
Recorded Investment:
Impaired loans with an allowance recorded	$	28,024	$	44,937	$	11,399	$	19,300	$	21,052	$	41	$	175	$	124,928
Impaired loans with no allowance recorded	16,869		21,387		2,350		—		696		332		188		41,822
Total loans individually evaluated for impairment	44,893		66,324		13,749		19,300		21,748		373		363		166,750
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	17,912		75,822		330		2,410		—		—		—		96,474
Total recorded investment	$	1,732,888	$	2,052,566	$	3,326,708	$	299,402	$	748,053	$	205,639	$	33,009	$	8,398,265
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	31,292	$	45,853	$	11,829	$	24,420	$	21,169	$	41	$	187	$	134,791
Impaired loans with no allowance recorded	17,010		21,550		4,104		—		885		483		188		44,220
Total loans individually evaluated for impairment	48,302		67,403		15,933		24,420		22,054		524		375		179,011
Loans collectively evaluated for impairment	1,670,083		1,910,420		3,312,629		277,692		726,305		205,266		32,646		8,135,041
Loans acquired with deteriorated credit quality	24,273		108,935		1,150		3,439		—		—		—		137,797
Total unpaid principal balance	$	1,742,658	$	2,086,758	$	3,329,712	$	305,551	$	748,359	$	205,790	$	33,021	$	8,451,849
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	2,082	$	2,537	$	1,926	$	1,052	$	3,112	$	39	$	17	$	10,765
Impaired loans with no allowance recorded	—		—		—		—		—		—		—		—
Total loans individually evaluated for impairment	2,082		2,537		1,926		1,052		3,112		39		17		10,765
Loans collectively evaluated for impairment	10,198		13,734		49,809		6,404		15,446		2,761		836		99,188
Loans acquired with deteriorated credit quality	174		58		31		—		—		—		—		263
Total allowance for credit losses	$	12,454	$	16,329	$	51,766	$	7,456	$	18,558	$	2,800	$	853	$	110,216

Troubled Debt Restructured Loans by Loan Class

The following table presents information on the financial effects of TDR loans by class for the three and six months ended June 30, 2015 and 2014:

	Three Months Ended June 30, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	—	—		—		—		—		—
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	—	—		—		—		—		—
Consumer	—	—		—		—		—		—
Total	1	$	256	$	—	$	—	$	256	$	—

	Six Months Ended June 30, 2015
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	—	—		—		—		—		—
Multi-family	—	—		—		—		—		—
Commercial and industrial		—
Commercial	1	256		—		—		256		—
Leases	—	—		—		—		—		—
Construction and land development		—
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	—	—		—		—		—		—
Consumer	—	—		—		—		—		—
Total	1	$	256	$	—	$	—	$	256	$	—

	Three Months Ended June 30, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	$	—	$	—	$	—	$	—
Non-owner occupied	1	13,423		—		—		13,423		8
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	1	966		—		—		966		1
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	2	897		281		33		583		7
Consumer	—	—		—		—		—		—
Total	4	$	15,286	$	281	$	33	$	14,972	$	16

	Six Months Ended June 30, 2014
	Number of Loans	Pre-Modification Outstanding Recorded Investment		Forgiven Principal Balance		Lost Interest Income		Post-Modification Outstanding Recorded Investment		Waived Fees and Other Expenses
	(dollars in thousands)
Commercial real estate
Owner occupied	1	$	798	$	378	$	117	$	303	$	33
Non-owner occupied	1	13,423		—		—		13,423		8
Multi-family	—	—		—		—		—		—
Commercial and industrial
Commercial	2	1,029		—		—		1,029		4
Leases	—	—		—		—		—		—
Construction and land development
Construction	—	—		—		—		—		—
Land	—	—		—		—		—		—
Residential real estate	3	1,302		447		70		785		7
Consumer	—	—		—		—		—		—
Total	7	$	16,552	$	825	$	187	$	15,540	$	52

Troubled Debt Restructured Loans by Class for Which There was a Payment Default

The following table presents TDR loans by class for which there was a payment default during the period: 

	Three Months Ended June 30,
	2015			2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	1	$	92
Non-owner occupied	—	—		—	—
Multi-family	—	—		—	—
Commercial and industrial
Commercial	—	—		2	306
Leases	—	—		—	—
Construction and land development
Construction	—	—		—	—
Land	—	—		—	—
Residential real estate	1	202		—	—
Consumer	—	—		—	—
Total	1	$	202	3	$	398

	Six Months Ended June 30,
	2015			2014
	Number of Loans	Recorded Investment		Number of Loans	Recorded Investment
	(dollars in thousands)
Commercial real estate
Owner occupied	—	$	—	2	$	395
Non-owner occupied	—	—		—	—
Multi-family	—	—		—	—
Commercial and industrial
Commercial	—	—		3	369
Leases	—	—		—	—
Construction and land development
Construction	1	137		—	—
Land	—	—		—	—
Residential real estate	1	202		1	202
Consumer	—	—		—	—
Total	2	$	339	6	$	966

XML

Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	$ 337	$ 0	$ 337	$ 0
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	8,976	0	8,976
Beginning balance	23,423	(11,131)	16,639	(21,546)
Other comprehensive income before reclassifications	(8,378)	10,525	(1,225)	21,169
Amounts reclassified from accumulated other comprehensive income	(34)	102	(403)	(127)
Net other comprehensive (loss) income	(8,075)	19,603	(1,291)	30,018
Ending balance	15,348	8,472	15,348	8,472
Unrealized holding gains (losses) on AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other Comprehensive Income (Loss), Transfers from Held-to-maturity to Available-for-Sale Securities, Net of Tax	0	8,976	0	8,976
Beginning balance	23,279	(11,275)	16,495	(21,690)
Other comprehensive income before reclassifications	(8,378)	10,525	(1,225)	21,169
Amounts reclassified from accumulated other comprehensive income	(34)	102	(403)	(127)
Net other comprehensive (loss) income	(8,412)	19,603	(1,628)	30,018
Ending balance	14,867	8,328	14,867	8,328
Supplemental Employee Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0		0
Other comprehensive income before reclassifications	0		0
Amounts reclassified from accumulated other comprehensive income	0		0
Net other comprehensive (loss) income	337		337
Ending balance	337		337
Impairment loss on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	144	144	144	144
Other comprehensive income before reclassifications	0	0	0	0
Amounts reclassified from accumulated other comprehensive income	0	0	0	0
Net other comprehensive (loss) income	0	0	0	0
Ending balance	$ 144	$ 144	$ 144	$ 144

XML

Label	Element	Value
Bank Owned Life Insurance Income	us-gaap_BankOwnedLifeInsuranceIncome	$ 772
Bank Owned Life Insurance Income	us-gaap_BankOwnedLifeInsuranceIncome	959
Gain (Loss) on Sale of Securities, Net	us-gaap_GainLossOnSaleOfSecuritiesNet	(163)
Gain (Loss) on Sale of Securities, Net	us-gaap_GainLossOnSaleOfSecuritiesNet	55
Junior Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	40,746
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	41,858
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationsRecurringBasisLiabilityValue	$ 42,836

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Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands		3 Months Ended	6 Months Ended
	Jun. 29, 2015 USD ($)	Jun. 30, 2015 Subsidiary	Jun. 30, 2015 USD ($) Subsidiary	Jun. 30, 2014 USD ($)
Significant Of Accounting Policies [Line Items]
Proceeds from Issuance of Subordinated Long-term Debt | $	$ 150,000		$ 148,450	$ 0
Number Of Wholly Owned Subsidiaries Non Bank Subsidiaries			1
Number of wholly-owned subsidiaries		10
Number Of Unconsolidated Subsidiaries		8
Maximum period of internal loss allowance calculation model			10 years
Debt Issuance Cost | $			$ (1,600)

XML

Commitments and Contingencies

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Unfunded Commitments and Letters of Credit

The Company is party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. They involve, to varying degrees, elements of credit risk in excess of amounts recognized in the Consolidated Balance Sheets.

Lines of credit are obligations to lend money to a borrower. Credit risk arises when the borrower's current financial condition may indicate less ability to pay than when the commitment was originally made. In the case of standby letters of credit, the risk arises from the potential failure of the customer to perform according to the terms of a contract. In such a situation, the third party might draw on the standby letter of credit to pay for completion of the contract and the Company would look to its customer to repay these funds with interest. To minimize the risk, the Company uses the same credit policies in making commitments and conditional obligations as it would for a loan to that customer.

Standby letters of credit and financial guarantees are commitments issued by the Company to guarantee the performance of a customer to a third party in borrowing arrangements. The Company generally has recourse to recover from the customer any amounts paid under the guarantees. Typically, letters of credit issued have expiration dates within 1 year.

A summary of the contractual amounts for unfunded commitments and letters of credit are as follows: 

	June 30, 2015		December 31, 2014
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $358,971 at June 30, 2015 and $232,863 at December 31, 2014	$	3,230,537	$	2,164,523
Credit card commitments and financial guarantees	57,452		42,038
Standby letters of credit, including unsecured letters of credit of $33,485 at June 30, 2015 and $5,166 at December 31, 2014	73,513		49,556
Total	$	3,361,502	$	2,256,117

Commitments to extend credit are agreements to lend to a customer provided that there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. The Company enters into credit arrangements that generally provide for the termination of advances in the event of a covenant violation or other event of default. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Company evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the party. The commitments are collateralized by the same types of assets used as loan collateral.

The Company has exposure to credit losses from unfunded commitments and letters of credit. As funds have not been disbursed on these commitments, they are not reported as loans outstanding. Credit losses related to these commitments are not included in the allowance for credit losses reported in "Note 4. Loans, Leases and Allowance for Credit Losses" of these Unaudited Consolidated Financial Statements and are accounted for as a separate loss contingency. This loss contingency for unfunded loan commitments and letters of credit was $2.1 million as of June 30, 2015 and December 31, 2014. Changes to this liability are adjusted through non-interest expense.

Concentrations of Lending Activities

The Company’s lending activities are driven in large part by the customers served in the market areas where the Company has branch offices in the states of Arizona, Nevada, and California. Despite the geographic concentration of lending activities, the Company does not have a single external customer from which it derives 10% or more of its revenues. The Company monitors concentrations within five broad categories: geography, industry, product, call report classifications, and collateral. The Company's loan portfolio includes significant credit exposure to the CRE market. As of June 30, 2015 and December 31, 2014, CRE related loans accounted for approximately 51% and 54% of total loans, respectively. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 48% and 46% of these CRE loans, excluding construction and land loans, were owner-occupied at June 30, 2015 and December 31, 2014, respectively.

Contingencies

The Company is involved in various lawsuits of a routine nature that are being handled and defended in the ordinary course of the Company’s business. Expenses are being incurred in connection with these lawsuits, but in the opinion of management, based in part on consultation with outside legal counsel, the resolution of these lawsuits and associated defense costs will not have a material impact on the Company’s financial position, results of operations, or cash flows.

Lease Commitments

The Company leases the majority of its office locations and many of these leases contain multiple renewal options and provisions for increased rents. Total rent expense of $1.6 million and $1.7 million was included in occupancy expenses for the three months ended June 30, 2015 and 2014, respectively. For the six months ended June 30, 2015 and 2014, total rent expense was $3.2 million and $3.3 million, respectively.