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 March 31, 2019 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. YesýNo¨

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted 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 such files).YesýNo¨

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

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).Yes¨Noý

As of April 25, 2019, Western Alliance Bancorporation had 104,473,076 shares of common stock outstanding.

INDEX

		Page
PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)
	Consolidated Balance Sheets	4
	Consolidated Income Statements	5
	Consolidated Statements of Comprehensive Income	6
	Consolidated Statements of Stockholders’ Equity	7
	Consolidated Statements of Cash Flows	8
	Notes to Unaudited Consolidated Financial Statements	10
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	59
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	83
Item 4.	Controls and Procedures	85
PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	85
Item 1A.	Risk Factors	85
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	85
Item 5.	Other Information	85
Item 6.	Exhibits	86
SIGNATURES		87

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 Unaudited Consolidated Financial Statements in Item 1 of this Form 10-Q.

ENTITIES / DIVISIONS:
ABA	Alliance Bank of Arizona	HOA Services	Homeowner Associations Services
BON	Bank of Nevada	LVSP	Las Vegas Sunset Properties
Bridge	Bridge Bank	TPB	Torrey Pines Bank
Company	Western Alliance Bancorporation and subsidiaries	WA PWI	Western Alliance Public Welfare Investments, LLC
CSI	CS Insurance Company	WAB or Bank	Western Alliance Bank
FIB	First Independent Bank	WABT	Western Alliance Business Trust
HFF	Hotel Franchise Finance	WAL or Parent	Western Alliance Bancorporation
TERMS:
AFS	Available-for-Sale	HFI	Held for Investment
ALCO	Asset and Liability Management Committee	HTM	Held-to-Maturity
AOCI	Accumulated Other Comprehensive Income	ICS	Insured Cash Sweep Service
ASC	Accounting Standards Codification	IRC	Internal Revenue Code
ASU	Accounting Standards Update	ISDA	International Swaps and Derivatives Association
Basel III	Banking Supervision's December 2010 final capital framework	LIBOR	London Interbank Offered Rate
BOD	Board of Directors	LIHTC	Low-Income Housing Tax Credit
CCO	Chief Credit Officer	MBS	Mortgage-Backed Securities
CDARS	Certificate Deposit Account Registry Service	NBL	National Business Lines
CDO	Collateralized Debt Obligation	NOL	Net Operating Loss
CEO	Chief Executive Officer	NPV	Net Present Value
CFO	Chief Financial Officer	OCI	Other Comprehensive Income
CLO	Collateralized Loan Obligation	OREO	Other Real Estate Owned
CRA	Community Reinvestment Act	OTTI	Other-than-Temporary Impairment
CRE	Commercial Real Estate	PCI	Purchased Credit Impaired
EPS	Earnings per share	PPNR	Pre-Provision Net Revenue
EVE	Economic Value of Equity	ROU	Right of use
Exchange Act	Securities Exchange Act of 1934, as amended	SBA	Small Business Administration
FASB	Financial Accounting Standards Board	SBIC	Small Business Investment Company
FDIC	Federal Deposit Insurance Corporation	SEC	Securities and Exchange Commission
FHLB	Federal Home Loan Bank	SERP	Supplemental Executive Retirement Plan
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
GSE	Government-Sponsored Enterprise

3

Item 1. Financial Statements

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS

	March 31, 2019			December 31, 2018
	(Unaudited)
	(in thousands, except shares and per share amounts)
Assets:
Cash and due from banks	$	160,329		$	180,053
Interest-bearing deposits in other financial institutions	335,282			318,519
Federal funds sold	290,000			—
Cash, cash equivalents, and restricted cash	785,611			498,572
Money market investments	—			7
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247			3,276,988
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	310,865			302,905
Investment securities - equity	118,005			115,061
Investments in restricted stock, at cost	66,287			66,132
Loans, net of deferred loan fees and costs	18,116,748			17,710,629
Less: allowance for credit losses	(154,987		)	(152,717		)
Net loans held for investment	17,961,761			17,557,912
Premises and equipment, net	119,827			119,474
Operating lease right of use asset	72,841			—
Other assets acquired through foreclosure, net	17,707			17,924
Bank owned life insurance	171,126			170,145
Goodwill	289,895			289,895
Other intangible assets, net	8,873			9,260
Deferred tax assets, net	22,309			31,990
Investments in LIHTC	331,972			342,381
Other assets	271,520			310,840
Total assets	$	23,792,846		$	23,109,486
Liabilities:
Deposits:
Non-interest-bearing demand	$	7,679,361		$	7,456,141
Interest-bearing	12,529,379			11,721,306
Total deposits	20,208,740			19,177,447
Customer repurchase agreements	15,141			22,411
Other borrowings	—			491,000
Qualifying debt	373,996			360,458
Operating lease liability	77,750			—
Other liabilities	396,599			444,436
Total liabilities	21,072,226			20,495,752
Commitments and contingencies (Note 13)
Stockholders’ equity:
Common stock - par value $0.0001; 200,000,000 authorized; 106,449,184 shares issued at March 31, 2019 and 106,741,870 at December 31, 2018	10			10
Treasury stock, at cost (1,966,238 shares at March 31, 2019 and 1,793,231 shares at December 31, 2018)	(60,983		)	(53,083		)
Additional paid in capital	1,390,569			1,417,724
Accumulated other comprehensive (loss)	(8,191		)	(33,622		)
Retained earnings	1,399,215			1,282,705
Total stockholders’ equity	2,720,620			2,613,734
Total liabilities and stockholders’ equity	$	23,792,846		$	23,109,486

See accompanying Notes to Unaudited Consolidated Financial Statements.

4

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED INCOME STATEMENTS

	Three Months Ended March 31,
	2019		2018
	(in thousands, except per share amounts)
Interest income:
Loans, including fees	$	258,818	$	205,959
Investment securities	28,178		25,772
Dividends	1,633		1,478
Other	2,539		1,488
Total interest income	291,168		234,697
Interest expense:
Deposits	35,788		14,173
Other borrowings	1,277		1,326
Qualifying debt	6,105		4,969
Other	662		9
Total interest expense	43,832		20,477
Net interest income	247,336		214,220
Provision for credit losses	3,500		6,000
Net interest income after provision for credit losses	243,836		208,220
Non-interest income:
Service charges and fees	5,412		5,745
Income from equity investments	2,009		1,460
Card income	1,841		1,972
Foreign currency income	1,095		1,202
Income from bank owned life insurance	981		928
Lending related income and gains (losses) on sale of loans, net	251		978
Unrealized gains (losses) on assets measured at fair value, net	2,834		(1,074		)
Other income	987		432
Total non-interest income	15,410		11,643
Non-interest expense:
Salaries and employee benefits	68,556		62,133
Occupancy	8,227		6,864
Legal, professional, and directors' fees	7,532		6,003
Data processing	6,332		5,207
Deposit costs	5,724		2,926
Insurance	2,809		3,869
Business development	2,085		1,728
Loan and repossessed asset expenses	2,006		583
Marketing	741		596
Card expense	634		942
Intangible amortization	387		398
Net loss (gain) on sales / valuations of repossessed and other assets	97		(1,228		)
Other expense	7,784		8,128
Total non-interest expense	112,914		98,149
Income before provision for income taxes	146,332		121,714
Income tax expense	25,536		20,814
Net income	$	120,796	$	100,900
Earnings per share:
Basic	$	1.16	$	0.97
Diluted	1.16		0.96
Weighted average number of common shares outstanding:
Basic	104,033		104,530
Diluted	104,475		105,324

See accompanying Notes to Unaudited Consolidated Financial Statements.

5

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Net income	$	120,796		$	100,900
Other comprehensive income (loss), net:
Unrealized gain (loss) on AFS securities, net of tax effect of $(10,222) and $12,714, respectively	31,377			(38,914		)
Unrealized (loss) gain on SERP, net of tax effect of $6 and $2, respectively	(18		)	(11		)
Unrealized (loss) gain on junior subordinated debt, net of tax effect of $1,934 and $(478), respectively	(5,928		)	1,466
Net other comprehensive income (loss)	25,431			(37,459		)
Comprehensive income	$	146,227		$	63,441

See accompanying Notes to Unaudited Consolidated Financial Statements.

6

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

	Common Stock				Additional Paid in Capital			Treasury Stock			Accumulated Other Comprehensive (Loss) Income			Retained Earnings			Total Stockholders’ Equity
	Shares		Amount
	(in thousands)
Balance, December 31, 2017	105,487		$	10	$	1,424,540		$	(40,173	)	$	(3,145	)	$	848,466		$	2,229,698
Balance, January 1, 2018 (1)	105,487		10		1,424,540			(40,173		)	(4,203		)	849,524			2,229,698
Net income	—		—		—			—			—			100,900			100,900
Exercise of stock options	9		—		215			—			—			—			215
Restricted stock, performance stock units, and other grants, net	546		—		6,705			—			—			—			6,705
Restricted stock surrendered (2)	(181	)	—		—			(6,296		)	—			—			(6,296		)
Other comprehensive income, net	—		—		—			—			(37,459		)	—			(37,459		)
Balance, March 31, 2018	105,861		$	10	$	1,431,460		$	(46,469	)	$	(41,662	)	$	950,424		$	2,293,763
Balance, December 31, 2018	104,949		$	10	$	1,417,724		$	(53,083	)	$	(33,622	)	$	1,282,705		$	2,613,734
Net income	—		—		—			—			—			120,796			120,796
Exercise of stock options	1		—		36			—			—			—			36
Restricted stock, performance stock unit, and other grants, net	647		—		6,472			—			—			—			6,472
Restricted stock surrendered (2)	(173	)	—		—			(7,900		)	—			—			(7,900		)
Stock repurchase	(941	)	—		(33,663		)	—			—			(4,286		)	(37,949		)
Other comprehensive income, net	—		—		—			—			25,431			—			25,431
Balance, March 31, 2019	104,483		$	10	$	1,390,569		$	(60,983	)	$	(8,191	)	$	1,399,215		$	2,720,620

(1) As adjusted for adoption of ASU 2016-01 and ASU 2018-02. The cumulative effect of adoption of this guidance at January 1, 2018 resulted in an increase to retained earnings of $1.1 million and a corresponding decrease to accumulated other comprehensive income.

(2) Share amounts represent Treasury Shares, see "Note 1. Summary of Significant Accounting Policies" for further discussion.

See accompanying Notes to Unaudited Consolidated Financial Statements.

7

WESTERN ALLIANCE BANCORPORATION AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Cash flows from operating activities:
Net income	$	120,796		$	100,900
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	3,500			6,000
Depreciation and amortization	4,209			3,407
Stock-based compensation	6,472			6,705
Deferred income taxes	1,398			(9,372		)
Amortization of net premiums for investment securities	3,004			3,920
Amortization of tax credit investments	10,145			8,128
Amortization of operating lease right of use asset	2,601			—
Accretion of fair market value adjustments on loans acquired from business combinations	(2,817		)	(5,738		)
Accretion and amortization of fair market value adjustments on other assets and liabilities acquired from business combinations	463			475
Income from bank owned life insurance	(981		)	(928		)
Losses / (Gains) on:
Assets measured at fair value, net	(2,834		)	1,074
Sale of loans	408			(678		)
Other assets acquired through foreclosure, net	—			(1,242		)
Valuation adjustments of other repossessed assets, net	99			47
Sale of premises, equipment, and other assets, net	(2		)	(33		)
Changes in:
Other assets	(33,071		)	5,773
Other liabilities	37,924			(30,122		)
Net cash provided by operating activities	$	151,314		$	88,316
Cash flows from investing activities:
Investment securities - AFS
Purchases	(26,342		)	(67,949		)
Principal pay downs and maturities	97,732			105,242
Investment securities - HTM
Purchases	(10,825		)	(7,800		)
Principal pay downs and maturities	2,868			243
Equity securities carried at fair value
Reinvestment of dividends	(151		)	—
Purchase of investment tax credits	(24,400		)	(13,376		)
Purchase of SBIC investments	(1,570		)	(263		)
Sale (purchase) of money market investments, net	7			(5		)
Proceeds from bank owned life insurance	—			72
(Purchase) liquidation of restricted stock, net	(155		)	(734		)
Loan fundings and principal collections, net	(385,497		)	(367,437		)
Purchase of premises, equipment, and other assets, net	(3,152		)	(576		)
Proceeds from sale of other real estate owned and repossessed assets, net	—			5,285
Net cash used in investing activities	$	(351,485	)	$	(347,298	)

8

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Cash flows from financing activities:
Net increase (decrease) in deposits	$	1,031,293		$	382,006
Net increase (decrease) in borrowings	(498,270		)	(94,340		)
Proceeds from exercise of common stock options	36			215
Cash paid for tax withholding on vested restricted stock	(7,900		)	(6,296		)
Common stock repurchases	(37,949		)	—
Net cash provided by financing activities	$	487,210		$	281,585
Net increase (decrease) in cash, cash equivalents, and restricted cash	287,039			22,603
Cash, cash equivalents, and restricted cash at beginning of period	498,572			416,768
Cash, cash equivalents, and restricted cash at end of period	$	785,611		$	439,371
Supplemental disclosure:
Cash paid (received) during the period for:
Interest	$	43,832		$	25,303
Income taxes, net of refunds	(34,619		)	9,881
Non-cash operating, investing, and financing activity:
Transfers to other assets acquired through foreclosure, net	—			5,744
Unfunded commitments originated	1,735			30,000
Change in unrealized gain (loss) on AFS securities, net of tax	31,377			(38,914		)
Change in unrealized (loss) gain on junior subordinated debt, net of tax	(5,928		)	1,466
Net increase (decrease) in unfunded obligations	12,787			120,512

See accompanying Notes to Unaudited Consolidated Financial Statements.

9

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, international banking, and online banking products and services through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services. In addition, the Company has two non-bank subsidiaries, LVSP, which holds and manages certain OREO properties, and a captive insurance company formed and licensed under the laws of the State of Arizona, CSI. CSI was established as part of the Company's overall enterprise risk management strategy.

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 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. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; certain assets and liabilities carried at fair value; and accounting for income taxes.

Principles of consolidation

As of March 31, 2019, WAL has the following significant wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

The Bank has the following significant wholly-owned subsidiaries: WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; WA PWI, which holds certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; and BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities.

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 reported in prior periods may have been reclassified in the Consolidated Financial Statements 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 months ended March 31, 2019 and 2018 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, 2018.

10

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.

Investment securities

Investment securities include debt securities and equity securities. Debt securities may be classified as HTM, AFS, or measured at fair value. 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 an HTM 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 securities are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS debt securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS debt 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 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 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

WAB is 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 Bank 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.

11

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, adjusted for net deferred fees and costs, purchase accounting fair value adjustments, and an allowance for credit losses. In addition, the book values of loans subject to a fair value hedge are adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk.

The Company may also acquire loans through a business combination. These acquired loans are recorded at estimated fair value on the date of purchase, which is comprised of unpaid principal adjusted for estimated credit losses and interest rate fair value adjustments. Loans are evaluated individually at the acquisition date 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 purchased loans that are not deemed impaired at the acquisition date, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 3. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

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 a 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 a 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: 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.

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. 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

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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 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 general allowance covers all non-impaired loans and incorporates several quantitative and qualitative factors, which are used for all of the Company's portfolio segments. Quantitative factors include company-specific, ten-year historical net charge-offs stratified by loans with similar characteristics. Qualitative factors include: 1) levels of and trends in delinquencies and impaired loans; 2) levels of and trends in charge-offs and recoveries; 3) trends in volume and terms of loans; 4) changes in underwriting standards or lending policies; 5) experience, ability, depth of lending staff; 6) national and local economic trends and conditions; 7) changes in credit concentrations; 8) out-of-market exposures; 9) changes in quality of loan review system; and 10) changes in the value of underlying collateral.

Due to the credit concentration of the Company's loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Arizona, Nevada, 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 the Bank 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.

Leases

At inception, contracts are evaluated to determine whether the contract constitutes a lease agreement. For contracts that are determined to be an operating lease, a corresponding ROU asset and operating lease liability are recorded in separate line items on the consolidated balance sheets. A ROU asset represents the Company’s right to use an underlying asset during the lease term and a lease liability represents the Company’s commitment to make contractually obligated lease payments. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease and are based on the present value of lease payments over the lease term. The measurement of the operating lease ROU asset includes any lease payments made and is reduced by lease incentives that are paid or are payable to the Company. Variable lease payments that depend on an index or rate such as the Consumer Price Index are included in lease payments based on the rate in effect at the commencement date of the lease. Lease payments are recognized on a straight-line basis as part of occupancy expense over the lease term.

As the rate implicit in the lease is not readily determinable, the incremental collateralized borrowing rate is used to determine the present value of lease payments. This rate gives consideration to the applicable FHLB collateralized borrowing rates and is based on the information available at the commencement date. The Company has elected to apply the short-term lease measurement and recognition exemption to leases with an initial term of 12 months or less; therefore, these leases are not recorded on the Company’s consolidated balance sheet, but rather, lease expense is recognized over the lease term on a straight-line basis. The Company’s lease agreements may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain that the options will be exercised.

In addition to the package of practical expedients, the Company also elected the practical expedient that allows lessees to make an accounting policy election to not separate non-lease components from the associated lease component, and instead account for them all together as part of the applicable lease component. This practical expedient can be elected separately for each underlying class of asset. The majority of the Company’s non-lease components such as common area maintenance, parking, and taxes are variable, and are expensed as incurred. Variable payment amounts are determined in arrears by the landlord depending on actual costs incurred. See “Note 4. Leases” of these Notes to Unaudited Consolidated Financial Statements for further disclosures required under the new standard.

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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.

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price over the fair value of the identifiable net assets acquired in accordance with applicable guidance. 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. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. If the qualitative assessment indicates potential impairment, a quantitative impairment test is necessary. If, based on the quantitative test, a reporting unit's carrying amount exceeds its fair value, a goodwill impairment charge for this difference is recorded to current period earnings as non-interest expense.

The Company’s intangible assets consist primarily of core deposit intangible assets that are amortized over periods ranging from 5 to 10 years. The Company considers the remaining useful lives of its core deposit intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its core deposit intangibles during the three months ended March 31, 2019 or 2018.

Treasury shares

The Company separately presents treasury shares, which represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. Treasury shares are carried at cost.

Common Stock Repurchases

On December 11, 2018, the Company adopted its common stock repurchase program, pursuant to which the Company is authorized to repurchase up to $250 million of its shares of common stock. All shares repurchased under the plan are retired upon settlement. The Company has elected to allocate the excess of the repurchase price over the par value of its common stock between additional paid-in capital and retained earnings. The allocation of the excess repurchase price to additional paid-in capital is limited to the amount of additional paid-in capital that was recorded at the time that the shares were initially issued, which is calculated on a last-in, first-out basis. 

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to the fair value of certain fixed-rate financial instruments (fair value 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. 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.

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. Changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value 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 after the derivative contract is executed. At inception, the Company performs a quantitative assessment to determine whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in the fair value of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. After the initial quantitative

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assessment is performed, on a quarterly basis, the Company performs a qualitative hedge effectiveness assessment. This assessment takes into consideration any adverse developments related to the counterparty's risk of default and any negative events or circumstances that affect the factors that originally enabled the Company to assess that it could reasonably support, qualitatively, an expectation that the hedging relationship was and will continue to be highly effective. 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 the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and 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 the host contract is measured at fair value, with changes in fair value reported in current earnings, or 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.

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.

The Company also has off-balance sheet arrangements related to its derivative instruments. Derivative instruments are recognized in the Consolidated Financial Statements at fair value and their notional values are carried off-balance sheet. See "Note 10. Derivatives and Hedging Activities" of these Notes to Unaudited Consolidated Financial Statements for further discussion.

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. Changes to estimated fair values from a business combination are recognized as an adjustment to goodwill during the measurement period and are recognized in the proper reporting period in which the adjustment amounts are determined. 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.

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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 may purchase the asset or assume 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 March 31, 2019 and 2018. The estimated fair value amounts for March 31, 2019 and 2018 have been measured as of period-end, and have not been re-evaluated 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.

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

Cash, cash equivalents, and restricted cash

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, exchange-listed preferred stock, and certain corporate debt securities are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of debt 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.

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 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 and customer repurchase agreements

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 and customer repurchase agreements have been categorized as Level 2 in the fair value hierarchy due to their short durations.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 3 in the fair value hierarchy.

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Junior subordinated debt

Junior subordinated debt is valued based on a discounted cash flow model which uses as inputs Treasury Bond rates and the 'BB' rated financial index. 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.

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 is considered, 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 the related tax liability line with other liabilities in the Consolidated Balance Sheet. See "Note 12. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements for further discussion on income taxes.

Non-interest income

Non-interest income includes service charges and fees, income from equity investments, card income, foreign currency income, income from bank owned life insurance, lending related income, net gain or loss on sales of investment securities, net unrealized gains or losses on assets measured at fair value, and other income. Service charges and fees consist of fees earned from performance of account analysis, general account services, and other deposit account services. These fees are recognized as the related services are provided in accordance with ASC 606, Revenue from Contracts with Customers. Income from equity investments includes gains on equity warrant assets, SBIC equity income, and success fees. Card income includes fees earned from customer use of debit and credit cards, interchange income from merchants, and international charges. Card income is generally within the scope of ASC 310, Receivables; however, certain processing transactions for merchants, such as interchange fees, are within the scope of ASC 606. Beginning on October 1, 2018, interchange fees are being recorded net of customer rewards earned, which is more in line with current industry practice. Foreign currency income represents fees earned on the differential between purchases and sales of foreign currency on behalf of the Company’s clients. Income from bank owned life insurance is accounted for in accordance with ASC 325, Investments - Other. Lending related income includes fees earned from gains or losses on the sale of loans, SBA income, and letter of credit fees. Gains and losses on the sale of loans and SBA income are recognized pursuant to ASC 860, Transfers and Servicing. Net unrealized gains or losses on assets measured at fair value represent fair value changes in equity securities and are accounted for in accordance with ASC 321, Investments - Equity Securities. Fees related to standby letters of credit are accounted for in accordance with ASC 440, Commitments. Other income includes operating lease income, which is recognized on a straight-line basis over the lease term in accordance with ASC 840, Leases. Net gain or loss on sales / valuations of repossessed and other assets is presented as a component of non-interest expense, but may also be presented as a component of non-interest income in the event that a net gain is recognized. Net gain or loss on sales of repossessed and other assets are accounted for in accordance with ASC 610, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets. See "Note 16. Revenue from Contracts with Customers" of these Notes to Unaudited Consolidated Financial Statements for further details related to the nature and timing of revenue recognition for non-interest income revenue streams within the scope of the new standard.

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Recent accounting pronouncements

In June 2016, the FASB issued guidance within ASU 2016-13, Measurement of Credit Losses on Financial Instruments. The new standard significantly changes the impairment model for most financial assets that are measured at amortized cost, including off-balance sheet credit exposures, from an incurred loss model to an expected loss model. The amendments in ASU 2016-13 to Topic 326, Financial Instruments - Credit Losses, require that an organization measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The ASU also requires enhanced disclosures, including qualitative and quantitative disclosures that provide additional information about the amounts recorded in the financial statements. Additionally, the ASU amends the accounting for credit losses on AFS debt securities and purchased financial assets with credit deterioration. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Management has formed a Steering Committee and established an implementation team made up of subject matter experts across different functions within the Company, including Finance, Risk, Credit, and IT, that will coordinate and facilitate all phases of planning and implementation of the new guidance. The Company has completed its loan portfolio stratification, with methodologies for measuring expected credit losses that include a combination of third-party vended models, internally-developed models, and simplified approaches. In addition, the Company has completed substantive pre-production runs and model validation activities, which encompass a majority of the Company’s loan portfolio. The implementation team is also updating the Company's accounting policies, designing key controls, and governance processes that are planned for implementation prior to adoption.

In August 2018, the FASB issued guidance within ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments within ASU 2018-13 remove, modify, and supplement the disclosure requirements for fair value measurements. Disclosure requirements that were removed include: the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. The amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. Additional disclosure requirements include: the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. With the exception of the above additional disclosure requirements, which will be applied prospectively, all other amendments should be applied retrospectively to all periods presented upon their effective date. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company's Consolidated Financial Statements.

In August 2018, the FASB issued guidance within ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40). The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). Accordingly, the amendments in this Update require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The amendments in this Update also require that the capitalized implementation costs of a hosting arrangement that is a service contract be expensed over the term of the hosting arrangement. Presentation requirements include: expense related to the capitalized implementation costs should be presented in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement, payments for capitalized implementation costs in the statement of cash flows should be classified in the same manner as payments made for fees associated with the hosting element, and capitalized implementation costs in the statement of financial position should be presented in the same line item that a prepayment for the fees of the associated hosting arrangement would be presented. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

In February 2016, the FASB issued guidance within ASU 2016-02, Leases. The amendments in ASU 2016-02 to Topic 842, Leases, require lessees to recognize the lease assets and lease liabilities arising from operating leases in the statement of financial position. The accounting applied by a lessor is largely unchanged from that applied under previous GAAP. The Company adopted the amendments to Topic 842 on January 1, 2019 using the modified retrospective approach. The Company elected the transition option issued under ASU 2018-11, Leases (Topic 842) Targeted Improvements, which allows entities to continue to apply the legacy guidance in ASC 840, Leases, to prior periods, including disclosure requirements. Accordingly, prior period financial results and disclosures have not been adjusted. The Company also elected to apply the package of practical expedients permitting entities to forgo reassessment of 1) expired or existing contracts that may contain leases; 2) lease classification of expired or existing

19

leases; and 3) initial direct costs for any existing leases. The Company established internal controls and implemented lease accounting software to facilitate the preparation of financial information and disclosures related to leases. The most significant impact of the new standard on the Company’s consolidated financial statements was the recognition of a ROU asset and lease liability for operating leases for which the Company is the lessee. The accounting for finance and operating leases for which the Company is the lessor remains substantially unchanged. Upon adoption of this guidance, on January 1, 2019, the Company recorded a ROU asset and corresponding lease liability of $42.5 million and $46.1 million, respectively, on the consolidated balance sheet. No cumulative effect adjustment to retained earnings resulted from adoption of this guidance. The new standard did not have a material impact on the Company’s results of operations or cash flows.

In March 2017, the FASB issued guidance within ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities. The amendments in ASU 2017-08 to Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs, shorten the amortization period for certain purchased callable debt securities held at a premium to the earliest call date, which more closely align the amortization period of premiums and discounts to expectations incorporated in market pricing on the underlying securities. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments in this ASU should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. As of March 31, 2019, the Company does not hold these types of securities, therefore, adoption of this guidance did not have an impact on the Company's Consolidated Financial Statements.

In June 2018, the FASB issued guidance within ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting. The amendments in ASU 2018-07 to Topic 718, Compensation-Stock Compensation, are intended to align the accounting for share-based payment awards issued to employees and nonemployees. Changes to the accounting for nonemployee awards include: 1) equity classified share-based payment awards issued to nonemployees will now be measured on the grant date, instead of the previous requirement to remeasure the awards through the performance completion date; 2) for performance conditions, compensation cost associated with the award will be recognized when achievement of the performance condition is probable, rather than upon achievement of the performance condition; and 3) the current requirement to reassess the classification (equity or liability) for nonemployee awards upon vesting will be eliminated, except for awards in the form of convertible instruments. The new guidance also clarifies that any share-based payment awards issued to customers should be evaluated under ASC 606, Revenue from Contracts with Customers. The Company's share-based payment awards to nonemployees consist only of grants made to the Company's BOD as compensation solely related to the individual's role as a Director. As such, in accordance with ASC 718, the Company accounts for these share-based payment awards to its Directors in the same manner as share-based payment awards for its employees. Accordingly, the adoption of this guidance did not have an impact on the accounting for the Company's share-based payment awards to its Directors.

In July 2018, the FASB issued guidance within ASU 2018-09, Codification Improvements. The amendments in ASU 2018-09 are intended to clarify or correct unintended guidance in the FASB Codification and affect a wide variety of Topics in the Codification. The topics that are applicable to the Company include: 1) debt modifications and extinguishments; 2) stock compensation; and 3) derivatives and hedging. For debt modifications and extinguishments, the amendment clarifies that, in an early extinguishment of debt for which the fair value option has been elected, the net carrying amount of the extinguished debt is equal to its fair value at the reacquisition date, and upon extinguishment, the cumulative amount of the gain or loss on the extinguished debt that resulted from changes in instrument-specific credit risk should be presented in net income. The Company has junior subordinated debt that is recorded at fair value at each reporting period due to election of the FVO. Accordingly, if in the future, the Company chooses to repay this debt prior to its contractual maturity, this amendment would be applicable. For stock compensation, the amendment clarifies that excess tax benefits or tax deficiencies should be recognized in the period in which the amount of the tax deduction is determined, which is typically when an award is exercised (in the case of share options) or vests (in the case of non-vested stock awards). The Company already records excess tax benefits or tax deficiencies in the periods in which the tax deduction is determined. Therefore, adoption of this amendment did not have an effect on the Company's accounting for excess tax benefits or tax deficiencies. For derivatives and hedging, previous guidance permits derivatives to be offset only when all four conditions (including the intent to set off) are met. This amendment clarifies that the intent to set off is not required to offset fair value amounts recognized for derivative instruments that are executed with the same counterparty under a master netting agreement. This amendment did not have an effect on the offsetting of the Company's derivative assets and liabilities.

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2. INVESTMENT SECURITIES

The carrying amounts and fair values of investment securities at March 31, 2019 and December 31, 2018 are summarized as follows:

	March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	310,865	$	20,218	$	—		$	331,083
Available-for-sale debt securities
CDO	$	50	$	14,976	$	—		$	15,026
Commercial MBS issued by GSEs	104,227		104		(5,232		)	99,099
Corporate debt securities	105,026		116		(8,100		)	97,042
Private label residential MBS	946,757		2,861		(14,271		)	935,347
Residential MBS issued by GSEs	1,509,590		2,408		(19,762		)	1,492,236
Tax-exempt	526,899		11,666		(1,575		)	536,990
Trust preferred securities	32,000		—		(3,383		)	28,617
U.S. government sponsored agency securities	40,000		—		(1,099		)	38,901
U.S. treasury securities	997		—		(8		)	989
Total AFS debt securities	$	3,265,546	$	32,131	$	(53,430	)	$	3,244,247
Equity securities
CRA investments	$	52,361	$	—	$	(747	)	$	51,614
Preferred stock	65,913		954		(476		)	66,391
Total equity securities	$	118,274	$	954	$	(1,223	)	$	118,005

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	302,905	$	3,163	$	(7,420	)	$	298,648
Available-for-sale debt securities
CDO	$	50	$	15,277	$	—		$	15,327
Commercial MBS issued by GSEs	106,385		82		(6,361		)	100,106
Corporate debt securities	105,029		—		(5,649		)	99,380
Private label residential MBS	948,161		945		(24,512		)	924,594
Residential MBS issued by GSEs	1,564,181		1,415		(35,472		)	1,530,124
Tax-exempt	542,086		4,335		(7,753		)	538,668
Trust preferred securities	32,000		—		(3,383		)	28,617
U.S. government sponsored agency securities	40,000		—		(1,812		)	38,188
U.S. treasury securities	1,996		—		(12		)	1,984
Total AFS debt securities	$	3,339,888	$	22,054	$	(84,954	)	$	3,276,988
Equity securities
CRA investments	$	52,210	$	—	$	(1,068	)	$	51,142
Preferred stock	65,954		148		(2,183		)	63,919
Total equity securities	$	118,164	$	148	$	(3,251	)	$	115,061

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The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI 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 debt securities, for the purpose of an OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates, credit spreads, and industry and issuer-specific factors), whether downgrades by bond rating agencies have occurred, 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.

At March 31, 2019 and December 31, 2018, the Company’s unrealized losses relate primarily to market interest rate increases since the securities' original purchase date. The total number of AFS securities in an unrealized loss position at March 31, 2019 is 230, compared to 373 at December 31, 2018. 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 are no impairment charges for the three months ended March 31, 2019 and 2018. The Company does not consider any securities to be other-than-temporarily impaired as of March 31, 2019 and December 31, 2018. No assurance can be made that OTTI will not occur in future periods.

Information pertaining to securities with gross unrealized losses at March 31, 2019 and December 31, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	March 31, 2019
	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 debt securities
Commercial MBS issued by GSEs	$	—	$	—	$	5,232	$	97,264	$	5,232	$	97,264
Corporate debt securities	—		—		8,100		91,900		8,100		91,900
Private label residential MBS	—		—		14,271		703,525		14,271		703,525
Residential MBS issued by GSEs	2		265		19,760		1,184,558		19,762		1,184,823
Tax-exempt	—		—		1,575		80,676		1,575		80,676
Trust preferred securities	—		—		3,383		28,617		3,383		28,617
U.S. government sponsored agency securities	—		—		1,099		33,901		1,099		33,901
U.S. treasury securities	—		—		8		989		8		989
Total AFS securities	$	2	$	265	$	53,428	$	2,221,430	$	53,430	$	2,221,695

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	December 31, 2018
	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)
Held-to-maturity debt securities
Tax-exempt	$	3,868	$	91,095	$	3,552	$	69,991	$	7,420	$	161,086
Available-for-sale debt securities
Commercial MBS issued by GSEs	$	—	$	—	$	6,361	$	98,275	$	6,361	$	98,275
Corporate debt securities	16		5,013		5,633		94,367		5,649		99,380
Private label residential MBS	5,173		217,982		19,339		537,316		24,512		755,298
Residential MBS issued by GSEs	1,363		141,493		34,109		1,215,490		35,472		1,356,983
Tax-exempt	3,562		209,767		4,191		72,382		7,753		282,149
Trust preferred securities	—		—		3,383		28,617		3,383		28,617
U.S. government sponsored agency securities	—		—		1,812		38,188		1,812		38,188
U.S. treasury securities	—		—		12		1,984		12		1,984
Total AFS securities	$	10,114	$	574,255	$	74,840	$	2,086,619	$	84,954	$	2,660,874

The amortized cost and fair value of securities as of March 31, 2019, 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. 

	March 31, 2019
	Amortized Cost		Estimated Fair Value
	(in thousands)
Held-to-maturity
Due in one year or less	$	10,100	$	10,147
After five years through ten years	14,386		14,984
After ten years	286,379		305,952
Total HTM securities	$	310,865	$	331,083
Available-for-sale
Due in one year or less	$	2,296	$	2,313
After one year through five years	12,036		12,206
After five years through ten years	211,149		203,258
After ten years	479,491		499,788
Mortgage-backed securities	2,560,574		2,526,682
Total AFS securities	$	3,265,546	$	3,244,247

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The following tables summarize the carrying amount of the Company’s investment ratings position as of March 31, 2019 and December 31, 2018: 

	March 31, 2019
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	310,865	$	310,865
Available-for-sale debt securities
CDO	$	—	$	—	$	—	$	—	$	—	$	15,026	$	—	$	15,026
Commercial MBS issued by GSEs	—		99,099		—		—		—		—		—		99,099
Corporate debt securities	—		—		—		64,300		32,742		—		—		97,042
Private label residential MBS	911,689		—		21,079		297		898		1,384		—		935,347
Residential MBS issued by GSEs	—		1,492,236		—		—		—		—		—		1,492,236
Tax-exempt	68,227		8,875		294,830		163,391		—		—		1,667		536,990
Trust preferred securities	—		—		—		—		28,617		—		—		28,617
U.S. government sponsored agency securities	—		38,901		—		—		—		—		—		38,901
U.S. treasury securities	—		989		—		—		—		—		—		989
Total AFS securities	$	979,916	$	1,640,100	$	315,909	$	227,988	$	62,257	$	16,410	$	1,667	$	3,244,247
Equity securities
CRA investments	$	—	$	25,375	$	—	$	—	$	—	$	—	$	26,239	$	51,614
Preferred stock	—		—		—		—		47,931		3,925		14,535		66,391
Total equity securities	$	—	$	25,375	$	—	$	—	$	47,931	$	3,925	$	40,774	$	118,005

(1)Where ratings differ, the Company uses an average of the available ratings by major credit agencies.

24

	December 31, 2018
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	302,905	$	302,905
Available-for-sale debt securities
CDO	$	—	$	—	$	—	$	—	$	—	$	15,327	$	—	$	15,327
Commercial MBS issued by GSEs	—		100,106		—		—		—		—		—		100,106
Corporate debt securities	—		—		—		66,515		32,865		—		—		99,380
Private label residential MBS	887,520		—		34,342		343		947		1,442		—		924,594
Residential MBS issued by GSEs	—		1,530,124		—		—		—		—		—		1,530,124
Tax-exempt	66,160		12,146		306,409		152,330		—		—		1,623		538,668
Trust preferred securities	—		—		—		—		28,617		—		—		28,617
U.S. government sponsored agency securities	—		38,188		—		—		—		—		—		38,188
U.S. treasury securities	—		1,984		—		—		—		—		—		1,984
Total AFS securities	$	953,680	$	1,682,548	$	340,751	$	219,188	$	62,429	$	16,769	$	1,623	$	3,276,988
Equity securities
CRA investments	$	—	$	25,375	$	—	$	—	$	—	$	—	$	25,767	$	51,142
Preferred stock	—		—		—		—		45,771		3,693		14,455		63,919
Total equity securities	$	—	$	25,375	$	—	$	—	$	45,771	$	3,693	$	40,222	$	115,061

(1) Where ratings differ, the Company uses an average of the available ratings by major credit agencies.

Securities with carrying amounts of approximately $940.0 million and $788.4 million at March 31, 2019 and December 31, 2018, respectively, were pledged for various purposes as required or permitted by law.

There were no gains and losses on sales of investment securities during the three months ended March 31, 2019 and March 31, 2018.

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3. LOANS, LEASES AND ALLOWANCE FOR CREDIT LOSSES

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

	March 31, 2019			December 31, 2018
	(in thousands)
Commercial and industrial	$	7,723,695		$	7,762,642
Commercial real estate - non-owner occupied	4,304,261			4,213,428
Commercial real estate - owner occupied	2,285,340			2,325,380
Construction and land development	2,283,527			2,134,753
Residential real estate	1,461,561			1,204,355
Consumer	58,364			70,071
Loans, net of deferred loan fees and costs	18,116,748			17,710,629
Allowance for credit losses	(154,987		)	(152,717		)
Total loans HFI	$	17,961,761		$	17,557,912

Net deferred loan fees and costs as of March 31, 2019 and December 31, 2018 total $34.8 million and $36.3 million, respectively, which is a reduction in the carrying value of loans. Net unamortized purchase discounts on secondary market loan purchases total $8.2 million and $2.0 million as of March 31, 2019 and December 31, 2018, respectively. Total loans held for investment are also net of interest rate and credit marks on acquired loans, which are a net reduction in the carrying value of loans. Interest rate marks were $6.1 million and $7.1 million as of March 31, 2019 and December 31, 2018, respectively. Credit marks were $13.1 million and $14.6 million as of March 31, 2019 and December 31, 2018, respectively.

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

	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 Days Past Due		Total Past Due		Total
	(in thousands)
Commercial and industrial	$	7,711,923	$	193	$	10,638	$	941	$	11,772	$	7,723,695
Commercial real estate
Owner occupied	2,281,389		2,630		1,321		—		3,951		2,285,340
Non-owner occupied	4,143,704		984		—		—		984		4,144,688
Multi-family	159,573		—		—		—		—		159,573
Construction and land development
Construction	1,497,960		—		—		—		—		1,497,960
Land	784,146		945		—		476		1,421		785,567
Residential real estate	1,439,763		13,660		2,736		5,402		21,798		1,461,561
Consumer	58,248		—		—		116		116		58,364
Total loans	$	18,076,706	$	18,412	$	14,695	$	6,935	$	40,042	$	18,116,748

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	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial and industrial	$	7,753,111	$	3,187	$	416	$	5,928	$	9,531	$	7,762,642
Commercial real estate
Owner occupied	2,320,321		4,441		—		618		5,059		2,325,380
Non-owner occupied	4,051,837		—		—		—		—		4,051,837
Multi-family	161,591		—		—		—		—		161,591
Construction and land development
Construction	1,382,664		—		—		—		—		1,382,664
Land	751,613		—		476		—		476		752,089
Residential real estate	1,182,933		9,316		4,010		8,096		21,422		1,204,355
Consumer	69,830		—		—		241		241		70,071
Total loans	$	17,673,900	$	16,944	$	4,902	$	14,883	$	36,729	$	17,710,629

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: 

	March 31, 2019								December 31, 2018
	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 and industrial	$	19,438	$	11,636	$	31,074	$	—	$	7,639	$	7,451	$	15,090	$	—
Commercial real estate
Owner occupied	420		—		420		—		—		—		—		594
Non-owner occupied	—		580		580		—		—		—		—		—
Multi-family	—		—		—		—		—		—		—		—
Construction and land development
Construction	3,307		—		3,307		—		—		476		476		—
Land	—		476		476		—		—		—		—		—
Residential real estate	1,168		6,746		7,914		—		552		11,387		11,939		—
Consumer	—		116		116		—		—		241		241		—
Total	$	24,333	$	19,554	$	43,887	$	—	$	8,191	$	19,555	$	27,746	$	594

The reduction in interest income associated with loans on non-accrual status was approximately $0.3 million and $0.6 million for the three months ended March 31, 2019 and 2018, 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 nine, 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 warrant management’s close attention, are deemed to be Special Mention. Risk ratings are updated, at a minimum, quarterly.

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The following tables present gross loans by risk rating: 

	March 31, 2019
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial and industrial	$	7,548,610	$	70,708	$	103,828	$	549	$	—	$	7,723,695
Commercial real estate
Owner occupied	2,206,311		23,044		55,985		—		—		2,285,340
Non-owner occupied	4,095,492		36,114		13,082		—		—		4,144,688
Multi-family	159,573		—		—		—		—		159,573
Construction and land development
Construction	1,470,710		4,088		23,162		—		—		1,497,960
Land	785,070		—		497		—		—		785,567
Residential real estate	1,452,919		365		8,277		—		—		1,461,561
Consumer	58,208		29		127		—		—		58,364
Total	$	17,776,893	$	134,348	$	204,958	$	549	$	—	$	18,116,748

	March 31, 2019
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	17,760,118	$	134,268	$	181,862	$	458	$	—	$	18,076,706
Past due 30 - 59 days	14,947		35		3,339		91		—		18,412
Past due 60 - 89 days	1,494		45		13,156		—		—		14,695
Past due 90 days or more	334		—		6,601		—		—		6,935
Total	$	17,776,893	$	134,348	$	204,958	$	549	$	—	$	18,116,748

	December 31, 2018
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial and industrial	$	7,574,506	$	61,202	$	126,356	$	578	$	—	$	7,762,642
Commercial real estate
Owner occupied	2,255,513		12,860		57,007		—		—		2,325,380
Non-owner occupied	4,030,350		12,982		8,505		—		—		4,051,837
Multi-family	161,591		—		—		—		—		161,591
Construction and land development
Construction	1,378,624		1,210		2,830		—		—		1,382,664
Land	751,012		—		1,077		—		—		752,089
Residential real estate	1,191,571		527		12,257		—		—		1,204,355
Consumer	69,755		75		241		—		—		70,071
Total	$	17,412,922	$	88,856	$	208,273	$	578	$	—	$	17,710,629

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	December 31, 2018
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	17,400,616	$	87,264	$	186,020	$	—	$	—	$	17,673,900
Past due 30 - 59 days	11,255		1,580		4,109		—		—		16,944
Past due 60 - 89 days	719		12		3,767		404		—		4,902
Past due 90 days or more	332		—		14,377		174		—		14,883
Total	$	17,412,922	$	88,856	$	208,273	$	578	$	—	$	17,710,629

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

	March 31, 2019			December 31, 2018
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	5,244		$	986
Impaired loans without a specific valuation allowance under ASC 310 (2)	138,154			111,266
Total impaired loans	$	143,398		$	112,252
Valuation allowance related to impaired loans	$	(1,357	)	$	(681	)

(1) Includes no TDR loans as of each of the periods ended at March 31, 2019 and December 31, 2018.

(2) Includes TDR loans of $68.9 million and $44.5 million at March 31, 2019 and December 31, 2018, respectively.

The following table presents impaired loans by class: 

	March 31, 2019		December 31, 2018
	(in thousands)
Commercial and industrial	$	78,768	$	63,896
Commercial real estate
Owner occupied	8,185		6,530
Non-owner occupied	12,268		12,407
Multi-family	—		—
Construction and land development
Construction	20,329		—
Land	8,286		9,403
Residential real estate	15,417		19,744
Consumer	145		272
Total	$	143,398	$	112,252

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 March 31, 2019 and December 31, 2018.

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Average balance on impaired loans	$	126,613	$	93,081
Interest income recognized on impaired loans	1,493		873
Interest recognized on non-accrual loans, cash basis	309		438

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Commercial and industrial	$	67,144	$	36,849
Commercial real estate
Owner occupied	7,569		9,043
Non-owner occupied	12,311		18,925
Multi-family	—		—
Construction and land development
Construction	12,451		—
Land	8,632		10,281
Residential real estate	18,278		17,799
Consumer	228		184
Total	$	126,613	$	93,081

The average investment in TDR loans was $51.6 million and $48.3 million for the three months ended March 31, 2019 and 2018, respectively.

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Commercial and industrial	$	769	$	250
Commercial real estate
Owner occupied	123		127
Non-owner occupied	187		262
Multi-family	—		—
Construction and land development
Construction	180		—
Land	129		130
Residential real estate	105		104
Consumer	—		—
Total	$	1,493	$	873

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

The following table summarizes nonperforming assets: 

	March 31, 2019		December 31, 2018
	(in thousands)
Non-accrual loans (1)	$	43,887	$	27,746
Loans past due 90 days or more on accrual status	—		594
Accruing troubled debt restructured loans	52,488		36,458
Total nonperforming loans	96,375		64,798
Other assets acquired through foreclosure, net	17,707		17,924
Total nonperforming assets	$	114,082	$	82,722

(1) Includes non-accrual TDR loans of $16.4 million and $8.0 million at March 31, 2019 and December 31, 2018, respectively.

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Loans Acquired with Deteriorated Credit Quality

Changes in the accretable yield for loans acquired with deteriorated credit quality are as follows:

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Balance, at beginning of period	$	3,768		$	9,324
Reclassifications from non-accretable to accretable yield (1)	—			683
Accretion to interest income	(161		)	(313		)
Reversal of fair value adjustments upon disposition of loans	(470		)	(1,586		)
Balance, at end of period	$	3,137		$	8,108

(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 March 31,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2019
Beginning Balance	$	22,513		$	34,829		$	11,276		$	83,118		$	981		$	152,717
Charge-offs	—			—			188			2,124			1			2,313
Recoveries	(55		)	(453		)	(93		)	(477		)	(5		)	(1,083		)
Provision	3,515			2,585			1,825			(4,217		)	(208		)	3,500
Ending balance	$	26,083		$	37,867		$	13,006		$	77,254		$	777		$	154,987
2018
Beginning Balance	$	19,511		$	31,495		$	5,478		$	82,793		$	773		$	140,050
Charge-offs	—			—			107			3,517			—			3,624
Recoveries	(1,388		)	(126		)	(250		)	(459		)	(10		)	(2,233		)
Provision	1,695			1,247			(102		)	3,143			17			6,000
Ending balance	$	22,594		$	32,868		$	5,519		$	82,878		$	800		$	144,659

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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		Consumer		Total Loans
	(in thousands)
Loans as of March 31, 2019;
Recorded Investment
Impaired loans with an allowance recorded	$	—	$	—	$	590	$	1,347	$	3,307	$	—	$	5,244
Impaired loans with no allowance recorded	8,185		12,268		78,178		14,070		25,308		145		138,154
Total loans individually evaluated for impairment	8,185		12,268		78,768		15,417		28,615		145		143,398
Loans collectively evaluated for impairment	2,273,235		4,232,710		7,644,927		1,446,125		2,254,912		58,219		17,910,128
Loans acquired with deteriorated credit quality	3,920		59,283		—		19		—		—		63,222
Total recorded investment	$	2,285,340	$	4,304,261	$	7,723,695	$	1,461,561	$	2,283,527	$	58,364	$	18,116,748
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	—	$	—	$	1,463	$	1,347	$	3,307	$	—	$	6,117
Impaired loans with no allowance recorded	13,479		14,398		117,839		22,428		41,528		10,505		220,177
Total loans individually evaluated for impairment	13,479		14,398		119,302		23,775		44,835		10,505		226,294
Loans collectively evaluated for impairment	2,273,235		4,232,710		7,644,927		1,446,125		2,254,912		58,219		17,910,128
Loans acquired with deteriorated credit quality	5,257		74,453		4,347		72		—		—		84,129
Total unpaid principal balance	$	2,291,971	$	4,321,561	$	7,768,576	$	1,469,972	$	2,299,747	$	68,724	$	18,220,551
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	—	$	—	$	297	$	250	$	810	$	—	$	1,357
Impaired loans with no allowance recorded	—		—		—		—		—		—		—
Total loans individually evaluated for impairment	—		—		297		250		810		—		1,357
Loans collectively evaluated for impairment	14,746		23,020		76,949		12,756		25,273		777		153,521
Loans acquired with deteriorated credit quality	—		101		8		—		—		—		109
Total allowance for credit losses	$	14,746	$	23,121	$	77,254	$	13,006	$	26,083	$	777	$	154,987

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	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2018;
Recorded Investment
Impaired loans with an allowance recorded	$	—	$	—	$	623	$	363	$	—	$	—	$	986
Impaired loans with no allowance recorded	6,530		12,407		63,273		19,381		9,403		272		111,266
Total loans individually evaluated for impairment	6,530		12,407		63,896		19,744		9,403		272		112,252
Loans collectively evaluated for impairment	2,314,871		4,121,464		7,698,746		1,184,592		2,125,350		69,799		17,514,822
Loans acquired with deteriorated credit quality	3,979		79,557		—		19		—		—		83,555
Total recorded investment	$	2,325,380	$	4,213,428	$	7,762,642	$	1,204,355	$	2,134,753	$	70,071	$	17,710,629
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	—	$	—	$	1,482	$	363	$	—	$	—	$	1,845
Impaired loans with no allowance recorded	11,852		18,155		103,992		27,979		25,624		10,632		198,234
Total loans individually evaluated for impairment	11,852		18,155		105,474		28,342		25,624		10,632		200,079
Loans collectively evaluated for impairment	2,314,871		4,121,464		7,698,746		1,184,592		2,125,350		69,799		17,514,822
Loans acquired with deteriorated credit quality	5,315		95,680		4,352		72		—		—		105,419
Total unpaid principal balance	$	2,332,038	$	4,235,299	$	7,808,572	$	1,213,006	$	2,150,974	$	80,431	$	17,820,320
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	—	$	—	$	621	$	60	$	—	$	—	$	681
Impaired loans with no allowance recorded	—		—		—		—		—		—		—
Total loans individually evaluated for impairment	—		—		621		60		—		—		681
Loans collectively evaluated for impairment	14,286		20,456		82,488		11,216		22,513		981		151,940
Loans acquired with deteriorated credit quality	—		87		9		—		—		—		96
Total allowance for credit losses	$	14,286	$	20,543	$	83,118	$	11,276	$	22,513	$	981	$	152,717

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.

During the three months ended March 31, 2019, the Company had two new TDR loans with a recorded investment of $27.1 million and five new TDR loans during the three months ended March 31, 2018 with a recorded investment of $15.0 million. No principal amounts were forgiven and there were no waived fees or other expenses resulting from these TDRs.

During the three months ended March 31, 2019 and 2018, there were no TDR loans for which there was a payment default.

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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 March 31, 2019 and December 31, 2018, commitments outstanding on TDR loans totaled $2.1 million and $1.5 million, respectively.

Loan Purchases and Sales

For the three months ended March 31, 2019 and 2018, secondary market loan purchases totaled $530.5 million and $141.5 million, respectively. For 2019, these purchased loans consisted of $312.5 million of residential real estate loans, $188.0 million of commercial and industrial loans, and $30.0 million of CRE, non-owner occupied loans. For 2018, these purchased loans consisted of $118.3 million of commercial and industrial loans and $23.2 million of residential real estate loans.

During the three months ended March 31, 2019, the Company sold commercial and industrial loans with carrying value of $15.5 million and recognized a net loss of $0.4 million. During the three months ended March 31, 2018, the Company sold loans which primarily consisted of commercial and industrial loans with a carrying value of $31.0 million and recognized a net gain of $0.7 million.

4. LEASES

Adoption of ASU 2016-02, Leases

On January 1, 2019, the Company adopted the amendments to ASC 842, Leases, which requires lessees to recognize lease assets and liabilities arising from operating leases on the balance sheet. The Company adopted the new lease guidance using the modified retrospective approach and elected the transition option issued under ASU 2018-11, Leases (Topic 842) Targeted Improvements, allowing entities to continue to apply the legacy guidance in ASC 840, Leases, to prior periods, including disclosure requirements. Accordingly, prior period financial results and disclosures have not been adjusted.

The Company has operating leases under which it leases its branch offices, corporate headquarters, other offices, and data facility centers. Upon adoption of the new lease guidance, on January 1, 2019, the Company recorded a ROU asset and corresponding lease liability of $42.5 million and $46.1 million, respectively, on the consolidated balance sheet. As of March 31, 2019, the Company's operating lease ROU asset and operating lease liability totaled $72.8 million and $77.8 million, respectively. The increase in the operating lease ROU asset and the operating lease liability from the adoption date is due to execution of a major office lease extension subsequent to the adoption date. A weighted average discount rate of 3.06% was used in the measurement of the ROU asset and lease liability as of March 31, 2019.

The Company's leases have remaining lease terms between one to twelve years, with a weighted average lease term of 9.03 years at March 31, 2019. Some leases include multiple five-year renewal options. The Company’s decision to exercise these renewal options is based on an assessment of its current business needs and market factors at the time of the renewal. Currently, the Company has no leases for which the option to renew is reasonably certain and therefore, options to renew were not factored into the calculation of its ROU asset and lease liability as of March 31, 2019.

The following is a schedule of the Company's operating lease liabilities by contractual maturity as of March 31, 2019:

	(in thousands)
2019	$	9,099
2020	11,200
2021	9,186
2022	7,992
2023	8,002
Thereafter	45,503
Total lease payments	$	90,982
Less: imputed interest	13,232
Total present value of lease liabilities	$	77,750

The Company also has additional operating leases, primarily related to its branch offices and corporate headquarters, that have not yet commenced as of March 31, 2019. The aggregate future commitment related to these additional leases totals $5.0 million. These operating leases will commence in fiscal year 2019 and have lease terms between six to twelve years.

34

Total operating lease costs of $3.3 million and other lease costs of $1.1 million, which include common area maintenance, parking, and taxes during the three months ended March 31, 2019 were included as part of occupancy expense. Short-term lease costs were not material during the three months ended March 31, 2019. For the three months ended March 31, 2018, rent expense associated with the Company's operating leases totaled $2.5 million.

The below table shows the supplemental cash flow information related to the Company's operating leases for the three months ended March 31, 2019:

	(in thousands)
Cash paid for amounts included in the measurement of operating lease liabilities	$	3,039
Right-of-use assets obtained in exchange for new operating lease liabilities	32,905

Lease Obligations as of December 31, 2018

As previously disclosed in the Company's Annual Report on Form 10-K as of and for the year ended December 31, 2018, the following is a schedule of future minimum rental payments under its non-cancelable operating leases, expiring through 2030:

	(in thousands)
2019	$	11,370
2020	10,322
2021	7,418
2022	6,294
2023	6,070
Thereafter	15,417
Total future minimum rental payments	$	56,891

5. OTHER ASSETS ACQUIRED THROUGH FORECLOSURE

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

	Three Months Ended March 31,
	2019
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	19,979		$	(2,055	)	$	17,924
Charitable contribution	(232		)	114			(118		)
Valuation adjustments, net	—			(99		)	(99		)
Balance, end of period	$	19,747		$	(2,040	)	$	17,707
	2018
Balance, beginning of period	$	32,552		$	(4,012	)	$	28,540
Transfers to other assets acquired through foreclosure, net	5,744			—			5,744
Proceeds from sale of other real estate owned and repossessed assets, net	(5,294		)	9			(5,285		)
Valuation adjustments, net	—			(47		)	(47		)
Gains (losses), net (1)	1,242			—			1,242
Balance, end of period	$	34,244		$	(4,050	)	$	30,194

(1) There were zero and $1.0 millioninnet gains related to initial transfers to other assets during the three months ended March 31, 2019 and 2018, respectively.

At March 31, 2019 and 2018, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 10 properties at March 31, 2019, compared to 11 at December 31, 2018, and 18 at March 31, 2018.

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6. OTHER BORROWINGS

The following table summarizes the Company’s borrowings as of March 31, 2019 and December 31, 2018: 

	March 31, 2019		December 31, 2018
	(in thousands)
Short-Term:
Federal funds purchased	$	—	$	256,000
FHLB advances	—		235,000
Total short-term borrowings	$	—	$	491,000

The Company maintains federal fund lines of credit totaling $955.0 million as of March 31, 2019, which have rates comparable to the federal funds effective rate plus 0.10% to 0.20%. As of March 31, 2019, there were no outstanding balances on the Company's lines of credit. As of December 31, 2018, outstanding balances on these federal fund lines of credit totaled $256.0 million.

The Company also 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 March 31, 2019, the Company had no FHLB overnight advances. At December 31, 2018, the Company had $235.0 million of FHLB overnight advances, with an interest rate of 2.56%.

Other short-term borrowing sources available to the Company include customer repurchase agreements, which have an average rate of 0.15%. At March 31, 2019 and December 31, 2018, customer repurchase agreements totaled $15.1 million and $22.4 million, respectively.

As of March 31, 2019 and December 31, 2018, the Company had additional available credit with the FHLB of approximately $2.97 billion and $2.52 billion, respectively, and with the FRB of approximately $1.32 billion and $1.31 billion, respectively.

7. QUALIFYING DEBT

Subordinated Debt

The Parent has $175.0 million of subordinated debentures, which were recorded net of issuance costs of $5.5 million, and mature July 1, 2056. Beginning on or after July 1, 2021, the Company may redeem the debentures, in whole or in part, at their principal amount plus any accrued and unpaid interest. The debentures have a fixed interest rate of 6.25% per annum.

WAB has $150.0 million of subordinated debt, which was recorded net of debt issuance costs of $1.8 million, and matures 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 on the Company's subordinated debt issuances, the Company entered into fair value interest rate hedges with receive fixed/pay variable swaps.

The carrying value of all subordinated debt issuances, which includes the fair value of the related hedges, totals $305.0 million and $299.4 million at March 31, 2019 and December 31, 2018, respectively.

Junior Subordinated Debt

The Company has formed or acquired through acquisition eight statutory business trusts, which exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities.

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 Company did not make the FVO election for the junior subordinated debt acquired as part of the Bridge acquisition. Accordingly, the carrying value of these trusts does not reflect the current fair value of the debt and includes a fair market value adjustment established at acquisition that is being accreted over the remaining life of the trusts.

The carrying value of junior subordinated debt was $69.0 million and $61.1 million as of March 31, 2019 and December 31, 2018, respectively. The weighted average interest rate of all junior subordinated debt as of March 31, 2019 was 4.94%, which is three-month LIBOR plus the contractual spread of 2.34%, compared to a weighted average interest rate of 5.15% at December 31, 2018.

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8. STOCKHOLDERS' EQUITY

Stock-Based Compensation

Restricted Stock Awards

Restricted stock awards granted to employees generally vest over a three-year period. Stock grants made to non-employee WAL directors in 2019 will be fully vested on July 1, 2019. The Company estimates the compensation expense for stock grants based upon the grant date fair value. Stock compensation expense is recognized on a straight-line basis over the requisite service period for the entire award. The aggregate grant date fair value for the restricted stock awards granted during the three months ended March 31, 2019 and 2018 was $20.7 million and $21.9 million, respectively. Stock compensation expense related to restricted stock awards and stock options granted to employees are included in Salaries and employee benefits in the Consolidated Income Statement. For restricted stock awards granted to WAL directors, the related stock compensation expense is included in Legal, professional, and directors' fees. For each of the three months ended March 31, 2019 and 2018, the Company recognized $4.3 million in stock-based compensation expense related to all restricted stock award grants.

In addition, the Company previously granted shares of restricted stock to certain members of executive management that had both performance and service conditions that affect vesting. There were no such grants made during the three months ended March 31, 2019 and 2018, however expense is still being recognized for the grants made in 2017 as they also have a three-year vesting period. For the three months ended March 31, 2019, the Company recognized $0.5 million in stock-based compensation expense related to these performance-based restricted stock grants, compared to $0.6 million for the three months ended March 31, 2018.

Performance Stock Units

The Company grants members of its executive management 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 months ended March 31, 2019, the Company recognized $1.7 million in stock-based compensation expense related to these performance stock units, compared to $1.6 million for the three months ended March 31, 2018.

The three-year performance period for the 2016 grant ended on December 31, 2018, 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, executive management members were entitled to the maximum award of 202,776 shares, which was paid out in the first quarter of 2019.

Common Stock Repurchase

On December 12, 2018, the Company announced that it had adopted a common stock repurchase plan, pursuant to which the Company is authorized to repurchase up to $250.0 million of its shares of common stock. During the three months ended March 31, 2019, the Company repurchased 940,915 shares of its common stock, representing approximately 1% of the Company's outstanding shares, pursuant to the repurchase plan. The shares were repurchased at a weighted average price of $40.30, for a total payment of $37.9 million.

Treasury Shares

Treasury share purchases represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. The Company purchased 173,007 treasury shares at a weighted average price of $45.66 per share and 180,867 treasury shares at a weighted average price of $59.02 per share during the three months ended March 31, 2019 and 2018, respectively.

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9. ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

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

	Three Months Ended March 31,
	Unrealized holding gains (losses) on AFS			Unrealized holding gains (losses) on SERP			Unrealized holding gains (losses) on junior subordinated debt			Impairment loss on securities		Total
	(in thousands)
Balance, December 31, 2018	$	(47,591	)	$	392		$	13,433		$	144	$	(33,622	)
Other comprehensive income (loss) before reclassifications	31,377			(18		)	(5,928		)	—		25,431
Amounts reclassified from AOCI	—			—			—			—		—
Net current-period other comprehensive income (loss)	31,377			(18		)	(5,928		)	—		25,431
Balance, March 31, 2019	$	(16,214	)	$	374		$	7,505		$	144	$	(8,191	)
Balance, December 31, 2017	$	(10,026	)	$	385		$	6,352		$	144	$	(3,145	)
Balance, January 1, 2018 (1)	(12,556		)	469			7,740			144		(4,203		)
Other comprehensive (loss) income before reclassifications	(38,914		)	(11		)	1,466			—		(37,459		)
Amounts reclassified from AOCI	—			—			—			—		—
Net current-period other comprehensive (loss) income	(38,914		)	(11		)	1,466			—		(37,459		)
Balance, March 31, 2018	$	(51,470	)	$	458		$	9,206		$	144	$	(41,662	)

(1) As adjusted for adoption of ASU 2016-01 and ASU 2018-02. The cumulative effect of adoption of this guidance at January 1, 2018 resulted in an increase to retained earnings of $1.1 million and a corresponding decrease to accumulated other comprehensive income.

During the three months ended March 31, 2019 and 2018, there were no amounts reclassified out of accumulated other comprehensive loss. 

10. DERIVATIVES AND HEDGING ACTIVITIES

The Company is a party to various derivative instruments. 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 March 31, 2019, December 31, 2018, and March 31, 2018, the Company does not have any outstanding cash flow hedges.

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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 has entered into pay fixed/receive variable interest rate swaps designated as fair value hedges of certain fixed rate loans. 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.

The Company has also entered into receive fixed/pay variable interest rate swaps, designated as fair value hedges on its fixed rate subordinated debt offerings. As a result, the Company is paying a floating rate of three-month LIBOR plus 3.16% and is receiving semi-annual fixed payments of 5.00% to match the payments on the $150.0 million subordinated debt. For the fair value hedge on the Parent's $175.0 million subordinated debentures issued on June 16, 2016, the Company is paying a floating rate of three-month LIBOR plus 3.25% and is receiving quarterly fixed payments of 6.25% to match the payments on the debt.

Derivatives Not Designated in Hedge Relationships

Management also enters into certain foreign exchange derivative contracts and back-to-back interest rate swaps which are not designated as accounting hedges. Foreign exchange derivative contracts include spot, forward, and forward window contracts. The purpose of these derivative contracts is to mitigate foreign currency risk on transactions entered into, or on behalf of customers. Contracts with customers, along with the related derivative trades that the Company places, are both remeasured at fair value, and are referred to as economic hedges since they economically offset the Company's exposure. The Company's back-to-back interest rate swaps are used to manage long-term interest rate risk.

As of March 31, 2019, derivatives not designated as hedging instruments were in a net asset position of $0.2 million, compared to a net asset position of $0.3 million at December 31, 2018 and March 31, 2018. For the three months ended March 31, 2019 and 2018, net changes in the fair value related to these derivative contracts totaled $1.2 million and $0.5 million, respectively, and are included as part of Foreign currency income in the Consolidated Income Statements.

As of March 31, 2019 and December 31, 2018, the following amounts are reflected in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges:

	March 31, 2019					December 31, 2018
	Carrying Value of Hedged Assets/(Liabilities)			Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)			Cumulative Fair Value Hedging Adjustment (1)
	(in thousands)
Loans - HFI, net of deferred loan fees and costs	$	656,346		$	33,123	$	650,428		$	23,039
Qualifying debt	(305,002		)	14,222		(299,401		)	19,691

(1) Included in the carrying value of the hedged assets/(liabilities).

For the Company's derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income and for subordinated debt, the gain or loss on the hedged item is included in interest expense.

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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 March 31, 2019, December 31, 2018, and March 31, 2018. 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:

	March 31, 2019						December 31, 2018						March 31, 2018
			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	$	961,493	$	987	$	48,332	$	965,705	$	2,162	$	44,892	$	989,379	$	3,533	$	42,789
Total	961,493		987		48,332		965,705		2,162		44,892		989,379		3,533		42,789
Netting adjustments (1)	—		987		987		—		2,162		2,162		—		3,493		3,493
Net derivatives in the balance sheet	$	961,493	$	—	$	47,345	$	965,705	$	—	$	42,730	$	989,379	$	40	$	39,296
Derivatives not designated as hedging instruments:
Foreign currency contracts	$	42,113	$	715	$	511	$	49,690	$	454	$	201	$	90,855	$	684	$	394
Interest rate swaps	2,348		12		12		2,378		27		27		36,840		1,170		1,170
Total	$	44,461	$	727	$	523	$	52,068	$	481	$	228	$	127,695	$	1,854	$	1,564

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

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 cash deposits or 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 $48.3 million at March 31, 2019, $44.9 million at December 31, 2018, and $40.1 million at March 31, 2018.

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The following table summarizes the Company's largest exposure to an individual counterparty at the dates indicated:

	March 31, 2019		December 31, 2018		March 31, 2018
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	987	$	1,411	$	2,515
Collateral posted by this counterparty	—		—		—
Derivative liability with this counterparty	32,250		23,906		20,624
Collateral pledged to this counterparty	40,035		25,761		29,719
Net exposure after netting adjustments and collateral	$	—	$	—	$	—

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 may be required to 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 March 31, 2019, December 31, 2018, and March 31, 2018 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 $47.3 million, $42.7 million, and $39.3 million, respectively. As of March 31, 2019, the Company was in an over-collateralized net position of $14.2 million after considering $62.5 million of collateral held in the form of cash and securities. As of December 31, 2018 and March 31, 2018, the Company was in an over-collateralized position of $7.6 million and $12.1 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 March 31,
	2019		2018
	(in thousands, except per share amounts)
Weighted average shares - basic	104,033		104,530
Dilutive effect of stock awards	442		794
Weighted average shares - diluted	104,475		105,324
Net income	$	120,796	$	100,900
Earnings per share - basic	1.16		0.97
Earnings per share - diluted	1.16		0.96

The Company had no anti-dilutive stock options outstanding at each of the periods ended March 31, 2019 and 2018.

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12. INCOME TAXES

The effective tax rate was 17.45% and 17.10% for the three months ended March 31, 2019 and 2018, respectively. The increase in the effective tax rate from the three months ended March 31, 2018 is due primarily to an increase in pre-tax book income and a smaller benefit from the excess stock compensation deduction.

As of March 31, 2019, the net deferred tax asset was $22.3 million, a decrease of $9.7 million from December 31, 2018. This overall decrease in the net deferred tax asset was primarily the result of an increase in the fair market value of AFS securities.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $22.3 million at March 31, 2019 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies that could be implemented if necessary to prevent a carryover from expiring.

At March 31, 2019 and December 31, 2018, the Company had a $2.4 million deferred tax valuation allowance related to net capital loss carryovers.

As of March 31, 2019, the Company’s gross federal NOL carryovers after current year-to-date utilization, all of which are subject to limitations under Section 382 of the IRC, totaled approximately $47.4 million for which an ending deferred tax asset of $5.8 million has been recorded, reflecting the expected benefit of these federal NOL carryovers remaining. The Company also has varying gross amounts of state NOL carryovers, with the most significant in Arizona. The ending gross Arizona NOL carryovers totaled approximately $5.0 million after current year-to-date utilization. A deferred tax asset of $0.3 million has been recorded to reflect the expected benefit of all state NOL carryovers remaining.

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 total $332.0 million and $342.4 million as of March 31, 2019 and December 31, 2018, respectively. Unfunded LIHTC obligations are included as part of other liabilities in the Consolidated Balance Sheets and total $147.3 million and $171.7 million as of March 31, 2019 and December 31, 2018, respectively. For the three months ended March 31, 2019 and 2018, $10.1 million and $8.1 million, respectively, of amortization related to LIHTC investments was recognized as a component of income tax expense.

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 one year.

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

	March 31, 2019		December 31, 2018
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $864,740 at March 31, 2019 and $770,114 at December 31, 2018	$	8,197,452	$	7,556,741
Credit card commitments and financial guarantees	251,675		237,312
Standby letters of credit, including unsecured letters of credit of $16,336 at March 31, 2019 and $21,879 at December 31, 2018	262,320		390,161
Total	$	8,711,447	$	8,184,214

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 included in other liabilities as a separate loss contingency and are not included in the allowance for credit losses reported in "Note 3. Loans, Leases and Allowance for Credit Losses" of these Unaudited Consolidated Financial Statements. This loss contingency for unfunded loan commitments and letters of credit was $9.2 millionand $8.2 million as of March 31, 2019 and December 31, 2018, respectively. Changes to this liability are adjusted through other expense in the Consolidated Income Statement.

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 four broad categories: geography, industry, product, and collateral. The Company's loan portfolio includes significant credit exposure to the CRE market. As of each of the periods ended March 31, 2019 and December 31, 2018, CRE related loans accounted for approximately 49% of total loans. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 35% and 36% of these CRE loans, excluding construction and land loans, were owner-occupied at March 31, 2019 and December 31, 2018, 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.

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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 results in the recognition of unrealized gains and losses on these items at each reporting date. These unrealized gains and losses are recognized as part of other comprehensive income rather than earnings. The Company did not elect FVO treatment for the junior subordinated debt assumed in the Bridge Capital Holdings acquisition.

For the three months ended March 31, 2019 and 2018, unrealized gains and losses from fair value changes on junior subordinated debt were as follows:

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Unrealized gains/(losses)	$	(7,862	)	$	1,944
Changes included in OCI, net of tax	(5,928		)	1,466

Fair value on a recurring basis

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

AFS securities: 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.

Equity securities: Preferred stock and CRA investments are reported at fair value utilizing Level 1 inputs.

Independent pricing service: The Company's independent pricing service provides pricing information on the majority of the Company's Level 1 and 2 AFS securities. For a small subset of securities, other pricing sources are used, including observed prices on publicly-traded securities and dealer quotes. 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 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, including other pricing services and safekeeping statements, and evaluates those with notable variances.  In instances where there are discrepancies in pricing from various sources and management expectations, management may manually price

44

securities using currently observed market data to determine whether they can develop similar prices or may utilize bid information from broker dealers. Any remaining discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and/or the Company’s other valuation advisors.

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.

The fair value of assets and liabilities measured at fair value on a recurring basis was 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)
March 31, 2019
Assets:
Available-for-sale debt securities
CDO	$	—	$	15,026	$	—	$	15,026
Commercial MBS issued by GSEs	—		99,099		—		99,099
Corporate debt securities	5,142		91,900		—		97,042
Private label residential MBS	—		935,347		—		935,347
Residential MBS issued by GSEs	—		1,492,236		—		1,492,236
Tax-exempt	—		536,990		—		536,990
Trust preferred securities	—		28,617		—		28,617
U.S. government sponsored agency securities	—		38,901		—		38,901
U.S. treasury securities	—		989		—		989
Total AFS debt securities	$	5,142	$	3,239,105	$	—	$	3,244,247
Equity securities
CRA investments	$	51,614	$	—	$	—	$	51,614
Preferred stock	66,391		—		—		66,391
Total equity securities	$	118,005	$	—	$	—	$	118,005
Derivative assets (1)	$	—	$	1,714	$	—	$	1,714
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	56,546	$	56,546
Derivative liabilities (1)	—		48,855		—		48,855

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $33,123 and the net carrying value of subordinated debt is increased by $14,222 as of March 31, 2019 for the effective portion of the hedge, which relates to the fair value 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, 2018
Assets:
Available-for-sale debt securities
CDO	$	—	$	15,327	$	—	$	15,327
Commercial MBS issued by GSEs	—		100,106		—		100,106
Corporate debt securities	—		99,380		—		99,380
Private label residential MBS	—		924,594		—		924,594
Residential MBS issued by GSEs	—		1,530,124		—		1,530,124
Tax-exempt	—		538,668		—		538,668
Trust preferred securities	—		28,617		—		28,617
U.S. government sponsored agency securities	—		38,188		—		38,188
U.S. treasury securities	—		1,984		—		1,984
Total AFS debt securities	$	—	$	3,276,988	$	—	$	3,276,988
Equity securities
CRA investments	$	51,142	$	—	$	—	$	51,142
Preferred stock	63,919		—		—		63,919
Total equity securities	$	115,061	$	—	$	—	$	115,061
Derivative assets (1)	$	—	$	2,643	$	—	$	2,643
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	48,684	$	48,684
Derivative liabilities (1)	—		45,120		—		45,120

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $23,039 and the net carrying value of subordinated debt is decreased by $19,691 as of December 31, 2018 for the effective portion of the hedge, which relates to the fair value 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.

For the three months ended March 31, 2019 and 2018, the change in Level 3 liabilities measured at fair value on a recurring basis was as follows:

	Junior Subordinated Debt
	Three Months Ended March 31,
	2019			2018
	(in thousands)
Beginning balance	$	(48,684	)	$	(56,234	)
Change in fair value (1)	(7,862		)	1,944
Ending balance	$	(56,546	)	$	(54,290	)

(1) Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $(5.9) million and $1.5 million for three months ended March 31, 2019 and 2018, respectively.

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For Level 3 liabilities measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2019		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in thousands)
Junior subordinated debt	$	56,546	Discounted cash flow	Implied credit rating of the Company	6.65	%

	December 31, 2018		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in thousands)
Junior subordinated debt	$	48,684	Discounted cash flow	Implied credit rating of the Company	7.82	%

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of March 31, 2019 and December 31, 2018 was the implied credit risk for the Company, calculated as the difference between the 20-year 'BB' rated financial index over the corresponding swap index.

As of March 31, 2019, the Company estimates the discount rate at 6.65%, which represents an implied credit spread of 4.05% plus three-month LIBOR (2.60%). As of December 31, 2018, the Company estimated the discount rate at 7.82%, which was a 5.01% credit spread plus three-month LIBOR (2.81%).

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 March 31, 2019;
Impaired loans with specific valuation allowance	$	3,887	$	—	$	—	$	3,887
Impaired loans without specific valuation allowance (1)	122,723		—		—		122,723
Other assets acquired through foreclosure	17,707		—		—		17,707
As of December 31, 2018:
Impaired loans with specific valuation allowance	$	305	$	—	$	—	$	305
Impaired loans without specific valuation allowance (1)	91,821		—		—		91,821
Other assets acquired through foreclosure	17,924		—		—		17,924

(1) Net of loan balances with charge-offs of $15.4 million and $19.4 million as of March 31, 2019 and December 31, 2018, respectively.

47

For Level 3 assets measured at fair value on a nonrecurring basis as of March 31, 2019 and December 31, 2018, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2019		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in thousands)
Impaired loans	$	126,610	Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	4.0% to 7.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	17,707		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2018		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in thousands)
Impaired loans	$	92,126	Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	4.0% to 7.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	17,924		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

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 independent third-party appraisals or internally-developed discounted cash flow analyses. 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 addition, when adjustments are made to an appraised value to reflect various factors such as the age of the appraisal or known changes in the market or the collateral, such valuation inputs are considered unobservable and the fair value measurement is categorized as a Level 3 measurement. Internal discounted cash flow analyses are also utilized to estimate the fair value of impaired loans, which considers internally-developed, unobservable inputs such as discount rates, default rates, and loss severity.

Total Level 3 impaired loans had an estimated fair value of $126.6 million and $92.1 million at March 31, 2019 and December 31, 2018, respectively. Impaired loans with a specific valuation allowance had a gross estimated fair value of $5.2 million and $1.0 million at March 31, 2019 and December 31, 2018, respectively, which was reduced by a specific valuation allowance of $1.4 million and $0.7 million, 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.

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

48

there is no observable market price, the resulting fair value measurement has been categorized as a Level 3 measurement. The Company had $17.7 million and $17.9 million of such assets at March 31, 2019 and December 31, 2018, respectively.

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 months ended March 31, 2019 and 2018, the Company determined that no securities experienced credit losses.

There is no OTTI balance recognized in comprehensive income as of March 31, 2019 and 2018.

Fair Value of Financial Instruments

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

	March 31, 2019
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Federal funds sold	$	290,000	$	—	$	290,000	$	—	$	290,000
Investment securities:
HTM	310,865		—		331,083		—		331,083
AFS	3,244,247		5,142		3,239,105		—		3,244,247
Equity	118,005		118,005		—		—		118,005
Derivative assets	1,714		—		1,714		—		1,714
Loans, net	17,961,761		—		17,344,300		126,610		17,470,910
Accrued interest receivable	98,128		—		98,128		—		98,128
Financial liabilities:
Deposits	$	20,208,740	$	—	$	20,225,997	$	—	$	20,225,997
Customer repurchase agreements	15,141		—		15,141		—		15,141
Qualifying debt	373,996		—		332,988		67,730		400,718
Derivative liabilities	48,855		—		48,855		—		48,855
Accrued interest payable	15,853		—		15,853		—		15,853

	December 31, 2018
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
HTM	$	302,905	$	—	$	298,648	$	—	$	298,648
AFS	3,276,988		—		3,276,988		—		3,276,988
Equity securities	115,061		115,061		—		—		115,061
Derivative assets	2,643		—		2,643		—		2,643
Loans, net	17,557,912		—		16,857,852		92,126		16,949,978
Accrued interest receivable	101,275		—		101,275		—		101,275
Financial liabilities:
Deposits	$	19,177,447	$	—	$	19,188,216	$	—	$	19,188,216
Customer repurchase agreements	22,411		—		22,411		—		22,411
Other borrowings	491,000		—		491,000		—		491,000
Qualifying debt	360,458		—		323,572		57,924		381,496
Derivative liabilities	45,120		—		45,120		—		45,120
Accrued interest payable	20,463		—		20,463		—		20,463

49

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 the Company's 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.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to preclude an interest rate risk profile that does not conform to both management and BOD risk tolerances without ALCO approval. There is also ALCO reporting at the Parent level for reviewing interest rate risk for the Company, which gets reported to the BOD and its Finance and Investment Committee.

Fair value of commitments

The estimated fair value of standby letters of credit outstanding at March 31, 2019 and December 31, 2018 is insignificant. Loan commitments on which the committed interest rates are less than the current market rate are also insignificant at March 31, 2019 and December 31, 2018.

50

15. SEGMENTS

The Company's reportable segments are aggregated based primarily on geographic location, services offered, and markets served. The Company's regional segments, which include Arizona, Nevada, Southern California, and Northern California, provide full service banking and related services to their respective markets. The operations from the regional segments correspond to the following banking divisions: ABA in Arizona, BON and FIB in Nevada, TPB in Southern California, and Bridge in Northern California.

The Company's NBL segments provide specialized banking services to niche markets. The Company's NBL reportable segments include HOA Services, Public & Nonprofit Finance, Technology & Innovation, HFF, and Other NBLs. These NBLs are managed centrally and are broader in geographic scope than the Company's other segments, though still predominately located within the Company's core market areas.

The Corporate & Other segment consists of corporate-related items, income and expense items not allocated to the Company's 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 or deficient 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.

The net income amount 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.

51

The following is a summary of operating segment information for the periods indicated:

				Regional Segments
Balance Sheet:	Consolidated Company			Arizona			Nevada			Southern California			Northern California
At March 31, 2019	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	4,525.0		$	2.3		$	9.1		$	2.0		$	1.9
Loans, net of deferred loan fees and costs	18,116.7			3,653.9			2,069.4			2,249.8			1,197.2
Less: allowance for credit losses	(155.0		)	(31.9		)	(18.3		)	(20.1		)	(9.4		)
Total loans	17,961.7			3,622.0			2,051.1			2,229.7			1,187.8
Other assets acquired through foreclosure, net	17.7			0.7			13.9			—			—
Goodwill and other intangible assets, net	298.8			—			23.2			—			155.3
Other assets	989.6			47.6			58.4			15.2			24.3
Total assets	$	23,792.8		$	3,672.6		$	2,155.7		$	2,246.9		$	1,369.3
Liabilities:
Deposits	$	20,208.7		$	5,319.9		$	4,006.8		$	2,793.8		$	2,008.7
Borrowings and qualifying debt	374.0			—			—			—			—
Other liabilities	489.5			11.6			12.0			0.5			13.4
Total liabilities	21,072.2			5,331.5			4,018.8			2,794.3			2,022.1
Allocated equity:	2,720.6			447.7			283.1			260.5			298.9
Total liabilities and stockholders' equity	$	23,792.8		$	5,779.2		$	4,301.9		$	3,054.8		$	2,321.0
Excess funds provided (used)	—			2,106.6			2,146.2			807.9			951.7

Income Statement:
Three Months Ended March 31, 2019	(in thousands)
Net interest income	$	247,336		$	55,226		$	39,096		$	30,477		$	23,033
Provision for (recovery of) credit losses	3,500			161			533			733			(719		)
Net interest income after provision for credit losses	243,836			55,065			38,563			29,744			23,752
Non-interest income	15,410			1,521			2,573			1,001			2,220
Non-interest expense	(112,914		)	(22,248		)	(15,781		)	(14,583		)	(13,490		)
Income (loss) before income taxes	146,332			34,338			25,355			16,162			12,482
Income tax expense (benefit)	25,536			8,584			5,325			4,525			3,495
Net income	$	120,796		$	25,754		$	20,030		$	11,637		$	8,987

52

	National Business Lines
Balance Sheet:	HOA Services			Public & Nonprofit Finance			Technology & Innovation			Hotel Franchise Finance			Other NBLs			Corporate & Other
At March 31, 2019
Assets:	(in millions)
Cash, cash equivalents, and investment securities	$	—		$	—		$	—		$	—		$	—		$	4,509.7
Loans, net of deferred loan fees and costs	209.4			1,561.7			1,057.3			1,564.9			4,549.0			4.1
Less: allowance for credit losses	(1.9		)	(14.8		)	(8.4		)	(9.5		)	(40.7		)	—
Total loans	207.5			1,546.9			1,048.9			1,555.4			4,508.3			4.1
Other assets acquired through foreclosure, net	—			—			—			—			—			3.1
Goodwill and other intangible assets, net	—			—			120.2			0.1			—			—
Other assets	0.9			12.5			6.4			7.7			58.8			757.8
Total assets	$	208.4		$	1,559.4		$	1,175.5		$	1,563.2		$	4,567.1		$	5,274.7
Liabilities:
Deposits	$	2,963.0		$	—		$	2,404.7		$	—		$	5.3		$	706.5
Borrowings and qualifying debt	—			—			—			—			—			374.0
Other liabilities	2.0			34.0			—			(0.3		)	60.9			355.4
Total liabilities	2,965.0			34.0			2,404.7			(0.3		)	66.2			1,435.9
Allocated equity:	77.7			126.0			253.3			130.3			374.3			468.8
Total liabilities and stockholders' equity	$	3,042.7		$	160.0		$	2,658.0		$	130.0		$	440.5		$	1,904.7
Excess funds provided (used)	2,834.3			(1,399.4		)	1,482.5			(1,433.2		)	(4,126.6		)	(3,370.0		)

Income Statement:
Three Months Ended March 31, 2019	(in thousands)
Net interest income	$	20,641		$	3,423		$	29,403		$	12,944		$	25,691		$	7,402
Provision for (recovery of) credit losses	(27		)	(41		)	(917		)	799			2,978			—
Net interest income after provision for credit losses	20,668			3,464			30,320			12,145			22,713			7,402
Non-interest income	96			—			3,362			—			657			3,980
Non-interest expense	(8,460		)	(1,907		)	(11,889		)	(2,398		)	(9,336		)	(12,822		)
Income (loss) before income taxes	12,304			1,557			21,793			9,747			14,034			(1,440		)
Income tax expense (benefit)	2,830			358			5,012			2,242			3,228			(10,063		)
Net income	$	9,474		$	1,199		$	16,781		$	7,505		$	10,806		$	8,623

53

				Regional Segments
	Consolidated Company			Arizona			Nevada			Southern California			Northern California
At December 31, 2018	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	4,259.7		$	2.5		$	10.9		$	2.5		$	3.0
Loans, net of deferred loan fees and costs	17,710.6			3,647.9			2,003.5			2,161.1			1,300.2
Less: allowance for credit losses	(152.7		)	(30.7		)	(18.7		)	(19.8		)	(10.7		)
Total loans	17,557.9			3,617.2			1,984.8			2,141.3			1,289.5
Other assets acquired through foreclosure, net	17.9			0.8			13.9			—			—
Goodwill and other intangible assets, net	299.2			—			23.2			—			155.5
Other assets	974.8			46.9			57.8			14.2			23.9
Total assets	$	23,109.5		$	3,667.4		$	2,090.6		$	2,158.0		$	1,471.9
Liabilities:
Deposits	$	19,177.4		$	5,090.2		$	3,996.4		$	2,347.5		$	1,839.1
Borrowings and qualifying debt	851.5			—			—			—			—
Other liabilities	466.9			10.4			14.5			4.5			12.2
Total liabilities	20,495.8			5,100.6			4,010.9			2,352.0			1,851.3
Allocated equity:	2,613.7			441.0			277.4			242.9			304.1
Total liabilities and stockholders' equity	$	23,109.5		$	5,541.6		$	4,288.3		$	2,594.9		$	2,155.4
Excess funds provided (used)	—			1,874.2			2,197.7			436.9			683.5

Income Statement:
Three Months Ended March 31, 2018	(in thousands)
Net interest income (expense)	$	214,220		$	54,555		$	36,690		$	27,802		$	22,255
Provision for (recovery of) credit losses	6,000			1,434			(1,723		)	729			1,548
Net interest income (expense) after provision for credit losses	208,220			53,121			38,413			27,073			20,707
Non-interest income	11,643			1,416			3,333			1,001			2,547
Non-interest expense	(98,149		)	(21,504		)	(14,084		)	(13,646		)	(12,503		)
Income (loss) before income taxes	121,714			33,033			27,662			14,428			10,751
Income tax expense (benefit)	20,814			8,321			5,903			4,135			3,098
Net income	$	100,900		$	24,712		$	21,759		$	10,293		$	7,653

54

	National Business Lines
	HOA Services			Public & Nonprofit Finance			Technology & Innovation			Hotel Franchise Finance			Other NBLs			Corporate & Other
At December 31, 2018
Assets:	(in millions)
Cash, cash equivalents, and investment securities	$	—		$	—		$	—		$	—		$	—		$	4,240.8
Loans, net of deferred loan fees and costs	210.0			1,547.5			1,200.9			1,479.9			4,154.9			4.7
Less: allowance for credit losses	(1.9		)	(14.2		)	(10.0		)	(8.5		)	(38.2		)	—
Total loans	208.1			1,533.3			1,190.9			1,471.4			4,116.7			4.7
Other assets acquired through foreclosure, net	—			—			—			—			—			3.2
Goodwill and other intangible assets, net	—			—			120.4			0.1			—			—
Other assets	0.9			20.1			6.3			7.2			37.1			760.4
Total assets	$	209.0		$	1,553.4		$	1,317.6		$	1,478.7		$	4,153.8		$	5,009.1
Liabilities:
Deposits	$	2,607.2		$	—		$	2,559.0		$	—		$	—		$	738.0
Borrowings and qualifying debt	—			—			—			—			—			851.5
Other liabilities	2.1			25.2			0.1			0.4			49.6			347.9
Total liabilities	2,609.3			25.2			2,559.1			0.4			49.6			1,937.4
Allocated equity:	70.7			123.9			268.7			122.3			340.0			422.7
Total liabilities and stockholders' equity	$	2,680.0		$	149.1		$	2,827.8		$	122.7		$	389.6		$	2,360.1
Excess funds provided (used)	2,471.0			(1,404.3		)	1,510.2			(1,356.0		)	(3,764.2		)	(2,649.0		)

Income Statement:
Three Months Ended March 31, 2018	(in thousands)
Net interest income (expense)	$	15,359		$	3,746		$	22,821		$	14,185		$	18,811		$	(2,004	)
Provision for (recovery of) credit losses	47			(207		)	1,651			1,236			1,285			—
Net interest income (expense) after provision for credit losses	15,312			3,953			21,170			12,949			17,526			(2,004		)
Non-interest income	150			—			3,051			13			224			(92		)
Non-interest expense	(7,803		)	(2,174		)	(9,833		)	(2,206		)	(5,662		)	(8,734		)
Income (loss) before income taxes	7,659			1,779			14,388			10,756			12,088			(10,830		)
Income tax expense (benefit)	1,761			409			3,309			2,474			2,780			(11,376		)
Net income	$	5,898		$	1,370		$	11,079		$	8,282		$	9,308		$	546

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16. REVENUE FROM CONTRACTS WITH CUSTOMERS

ASC 606, Revenue from Contracts with Customers, requires revenue to be recognized at an amount that reflects the consideration to which the entity expects to be entitled in exchange for transferring goods or services to a customer. ASC 606 applies to all contracts with customers to provide goods or services in the ordinary course of business, except for contracts that are specifically excluded from its scope. The majority of the Company’s revenue streams including interest income, credit and debit card fees, income from equity investments including warrants and SBIC equity income, income from bank owned life insurance, foreign currency income, lending related income, and gains and losses on sales of investment securities are outside the scope of ASC 606. Revenue streams including service charges and fees, interchange fees on credit and debit cards, and success fees are within the scope of ASC 606.

Disaggregation of Revenue

The following table represents a disaggregation of revenue from contracts with customers for the periods indicated along with the reportable segment for each revenue category:

			Regional Segments
	Consolidated Company		Arizona		Nevada		Southern California		Northern California
Three Months Ended March 31, 2019	(in thousands)
Revenue from contracts with customers:
Service charges and fees	$	5,412	$	1,079	$	1,915	$	726	$	890
Debit and credit card interchange (1)	1,865		337		376		173		971
Success fees (2)	435		—		—		—		—
Other income	119		9		23		9		26
Total revenue from contracts with customers	$	7,831	$	1,425	$	2,314	$	908	$	1,887
Revenues outside the scope of ASC 606 (3)	7,579		96		259		93		333
Total non-interest income	$	15,410	$	1,521	$	2,573	$	1,001	$	2,220

	National Business Lines
	HOA Services		Public & Nonprofit Finance		Technology & Innovation		Hotel Franchise Finance		Other NBLs		Corporate & Other
Three Months Ended March 31, 2019	(in thousands)
Revenue from contracts with customers:
Service charges and fees	$	88	$	—	$	713	$	—	$	1	$	—
Debit and credit card interchange (1)	8		—		—		—		—		—
Success fees (2)	—		—		435		—		—		—
Other income	—		—		—		—		38		14
Total revenue from contracts with customers	$	96	$	—	$	1,148	$	—	$	39	$	14
Revenues outside the scope of ASC 606 (3)	—		—		2,214		—		618		3,966
Total non-interest income	$	96	$	—	$	3,362	$	—	$	657	$	3,980

			Regional Segments
	Consolidated Company		Arizona		Nevada		Southern California		Northern California
Three Months Ended March 31, 2018	(in thousands)
Revenue from contracts with customers:
Service charges and fees	$	5,745	$	917	$	2,069	$	738	$	1,059
Debit and credit card interchange (1)	1,508		257		272		139		837
Success fees (2)	781		—		—		—		2
Other income	235		61		69		27		73
Total revenue from contracts with customers	$	8,269	$	1,235	$	2,410	$	904	$	1,971
Revenues outside the scope of ASC 606 (3)	3,374		181		923		97		576
Total non-interest income	$	11,643	$	1,416	$	3,333	$	1,001	$	2,547

56

	National Business Lines
	HOA Services		Public & Nonprofit Finance		Technology & Innovation		Hotel Franchise Finance		Other NBLs		Corporate & Other
Three Months Ended March 31, 2018	(in thousands)
Revenue from contracts with customers:
Service charges and fees	$	146	$	—	$	815	$	—	$	—	$	1
Debit and credit card interchange (1)	3		—		—		—		—		—
Success fees (2)	—		—		779		—		—		—
Other income	—		—		—		—		—		5
Total revenue from contracts with customers	$	149	$	—	$	1,594	$	—	$	—	$	6
Revenues outside the scope of ASC 606 (3)	1		—		1,457		13		224		(98		)
Total non-interest income	$	150	$	—	$	3,051	$	13	$	224	$	(92	)

(1) Included as part of Card income in the Consolidated Income Statement.

(2) Included as part of Income from equity investments in the Consolidated Income Statement.

(3) Amounts are accounted for under separate guidance. Refer to discussion of revenue sources not subject to ASC 606 under the Non-interest income section in "Note 1. Summary of Significant Accounting Policies."

Performance Obligations

Many of the services the Company performs for its customers are ongoing, and either party may cancel at any time. The fees for these contracts are dependent upon various underlying factors, such as customer deposit balances, and as such may be considered variable. The Company’s performance obligations for these services are satisfied as the services are rendered and payment is collected on a monthly, quarterly, or semi-annual basis. Other contracts with customers are for services to be provided at a point in time, and fees are recognized at the time such services are rendered. The Company had no material unsatisfied performance obligations as of March 31, 2019. The revenue streams within the scope of ASC 606 are described in further detail below.

Service Charges and Fees

The Company performs deposit account services for its customers, which include analysis and treasury management services, use of safe deposit boxes, check upcharges, and other ancillary services. The depository arrangements the Company holds with its customers are considered day-to-day contracts with ongoing renewals and optional purchases, and as such, the contract duration does not extend beyond the services performed. Due to the short-term nature of such contracts, the Company generally recognizes revenue for deposit related fees as services are rendered. From time to time, the Company may waive certain fees for its customers. The Company considers historical experience when recognizing revenue from contracts with customers, and may reduce the transaction price to account for fee waivers or refunds.

Debit and Credit Card Interchange

When a credit or debit card issued by the Company is used to purchase goods or services from a merchant, the Company earns an interchange fee. The Company considers the merchant its customer in these transactions as the Company provides the merchant with the service of enabling the cardholder to purchase the merchant’s goods or services with increased convenience, and it enables the merchants to transact with a class of customer that may not have access to sufficient funds at the time of purchase. The Company acts as an agent to the payment network by providing nightly settlement services between the network and the merchant. This transmission of data and funds represents the Company’s performance obligation and is performed nightly. As the payment network is in direct control of setting the rates and the Company is acting as an agent, the interchange fee is recorded net of expenses as the services are provided.

Success Fees

Success fees are one-time fees detailed as part of certain loan agreements and are earned immediately upon occurrence of a triggering event. Examples of triggering events include: a borrower obtaining its next round of funding, an acquisition, or completion of a public offering. Success fees are variable consideration as the transaction price can vary and is contingent on the occurrence or non-occurrence of a future event. As the consideration is highly susceptible to factors outside of the Company’s influence and uncertainty about the amount of consideration is not expected to be resolved for an extended period of time, the variable consideration is constrained and is not recognized until the achievement of the triggering event.

57

Principal versus Agent Considerations

When more than one party is involved in providing goods or services to a customer, ASC 606 requires the Company to determine whether it is the principal or an agent in these transactions by evaluating the nature of its promise to the customer. An entity is a principal and therefore records revenue on a gross basis, if it controls a promised good or service before transferring that good or service to the customer. An entity is an agent and records as revenue the net amount it retains for its agency services if its role is to arrange for another entity to provide the goods or services. The Company most commonly acts as a principal and records revenue on a gross basis, except in certain circumstances. As an example, revenues earned from interchange fees, in which the Company acts as an agent, are recorded as non-interest income, net of the related expenses paid to the principal.

Contract Balances

The timing of revenue recognition may differ from the timing of cash settlements or invoicing to customers. The Company records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services to customers. The Company generally receives payments for its services during the period or at the time services are provided, therefore, does not have material contract liability balances at period-end. The Company records contract assets or receivables when revenue is recognized prior to receipt of cash from the customer. Accounts receivable totals $1.4 million at each of the periods ended March 31, 2019 and December 31, 2018 and are presented in Other assets in the Consolidated Balance Sheets.

58

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, 2018 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 March 31, 2019 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 the Company's current views about future events and financial performance and involve certain risks, uncertainties, assumptions, and changes in circumstances that may cause the Company's 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 the Company's 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 the real estate market; 3) high concentration of commercial real estate and commercial and industrial loans; 4) actual credit losses may exceed expected losses in the loan portfolio; 5) recent changes to FASB accounting standards and the impact on the recognition of credit losses; 6) results of any tax audit findings, challenges to the Company's tax positions, or adverse changes or interpretations of tax laws; 7) the geographic concentrations of the Company's assets increase the risks related to local economic conditions; 8) exposure of financial instruments to certain market risks may increase the volatility of earnings and AOCI; 9) dependence on low-cost deposits; 10) ability to borrow from the FHLB or the FRB; 11) perpetration of fraud; 12) information security breaches; 13) reliance on third parties to provide key components of the Company's infrastructure; 14) a change in the Company's creditworthiness; 15) the Company's ability to implement and improve its controls and processes to keep pace with its growth; 16) expansion strategies may not be successful; 17) risks associated with new lines of businesses or new products and services within existing lines of business; 18) the Company's ability to compete in a highly competitive market; 19) the Company's ability to recruit and retain qualified employees and implement adequate succession planning to mitigate the loss of key members of its senior management team; 20) inadequate or ineffective risk management practices and internal controls and procedures; 21) the Company's ability to adapt to technological change; 22) exposure to natural and manmade disasters in markets that the Company operates; 23) risk of operating in a highly regulated industry and the Company's ability to remain in compliance; 24) failure to comply with state and federal banking agency laws and regulations; 25) uncertainty about the future of LIBOR, changes in interest rates, and increased rate competition; 26) exposure to environmental liabilities related to the properties to which the Company acquires title; and 27) risks related to ownership and price of the Company's common stock.

For more information regarding risks that may cause the Company's actual results to differ materially from any forward-looking statements, see “Risk Factors” in Item 1A of the Company's Annual Report on Form 10-K for the year ended December 31, 2018.

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, international banking, and online banking products and services through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON and FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services.

59

Financial Results Highlights for the First Quarter of 2019

Effective for the first quarter 2019, annualized performance metrics are calculated on an actual/actual basis, from a previous 30/360 basis as management believes that this change results in quarterly results that are more comparable. Prior period amounts have been restated to conform to the current presentation.

• Net income of $120.8 million, compared to $100.9 million for the first quarter 2018

• Diluted earnings per share of $1.16, compared to $0.96 per share for the first quarter 2018

• Total loans of $18.12 billion, up $406.1 million from December 31, 2018

• Total deposits of $20.21 billion, up $1.03 billion from December 31, 2018

• Net interest margin of 4.71%, compared to 4.66% in the first quarter 2018

• Net operating revenue of $259.9 million, an increase of 14.5%, or $33.0 million, compared to the first quarter 2018, and an increase in operating non-interest expenses of 13.5%, or $13.4 million, compared to the first quarter 2018¹ 

• Operating PPNR of $147.1 million, up15.3% from $127.6 million in the first quarter 2018¹ 

• Efficiency ratio of 42.0% in the first quarter 2019, compared to 42.4% in the first quarter 2018

• Operating efficiency ratio of 42.4% in the first quarter 2019, compared to 42.7% in the first quarter 2018¹

• Nonperforming assets (nonaccrual loans and repossessed assets) increased to 0.26% of total assets, from 0.20% at December 31, 2018

• Annualized net loan charge-offs to average loans outstanding of 0.03%, compared to 0.04% for the first quarter 2018

• Tangible common equity ratio of 10.3%, compared to 9.8% at March 31, 2018¹

• Stockholders' equity of $2.72 billion, an increase of $106.9 million from December 31, 2018

• Book value per common share of $26.04, an increase of 20.2% from $21.67 at March 31, 2018

• Tangible book value per share, net of tax, of $23.20, an increase of $4.34 from $18.86 at March 31, 2018¹

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 months ended March 31, 2019.

¹ See Non-GAAP Financial Measures section beginning on page 62.

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As a bank holding company, management focuses on key ratios in evaluating the Company's financial condition and results of operations.

Results of Operations and Financial Condition

A summary of the Company's results of operations, financial condition, and selected metrics are included in the following tables: 

	Three Months Ended March 31,
	2019			2018
	(in thousands, except per share amounts)
Net income	$	120,796		$	100,900
Earnings per share - basic	1.16			0.97
Earnings per share - diluted	1.16			0.96
Return on average assets	2.12		%	2.02		%
Return on average tangible common equity (1)	20.49			20.74
Net interest margin	4.71			4.66

(1) See Non-GAAP Financial Measures section beginning on page 62.

	March 31, 2019		December 31, 2018
	(in thousands)
Total assets	$	23,792,846	$	23,109,486
Total loans, net of deferred loan fees and costs	18,116,748		17,710,629
Total deposits	20,208,740		19,177,447

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 the Company's key asset quality metrics: 

	March 31, 2019			December 31, 2018
	(dollars in thousands)
Non-accrual loans	$	43,887		$	27,746
Non-performing assets	114,082			82,722
Non-accrual loans to gross loans	0.24		%	0.16		%
Net charge-offs to average loans outstanding (1)	0.03			0.06

(1) Annualized on an actual/actual basis for the three months ended March 31, 2019. Actual year-to-date for the year ended December 31, 2018.

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 $23.79 billion at March 31, 2019 from $23.11 billion at December 31, 2018. The increase in total assets of $683.4 million, or 3.0%, relates primarily to loan growth. Total loans increased by $406.1 million, or 2.3%, to $18.12 billion as of March 31, 2019, compared to $17.71 billion as of December 31, 2018. The increase in loans from December 31, 2018 was driven by residential real estate loans of $257.2 million, construction and land development loans of $148.8 million, and CRE non-owner occupied loans of $90.8 million. These increases were partially offset by decreases in CRE owner-occupied loans of $40.0 million and commercial and industrial loans of $38.9 million. Total deposits increased $1.03 billion, or 5.4%, to $20.21 billion as of March 31, 2019 from $19.18 billion as of December 31, 2018.

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RESULTS OF OPERATIONS

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

	Three Months Ended March 31,				Increase
	2019		2018		(Decrease)
	(in thousands, except per share amounts)
Consolidated Income Statement Data:
Interest income	$	291,168	$	234,697	$	56,471
Interest expense	43,832		20,477		23,355
Net interest income	247,336		214,220		33,116
Provision for credit losses	3,500		6,000		(2,500		)
Net interest income after provision for credit losses	243,836		208,220		35,616
Non-interest income	15,410		11,643		3,767
Non-interest expense	112,914		98,149		14,765
Income before provision for income taxes	146,332		121,714		24,618
Income tax expense	25,536		20,814		4,722
Net income	$	120,796	$	100,900	$	19,896
Earnings per share - basic	$	1.16	$	0.97	$	0.19
Earnings per share - diluted	$	1.16	$	0.96	$	0.20

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 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.

Operating Pre-Provision Net Revenue

Operating PPNR is defined by the Federal Reserve in SR 14-3, which requires companies subject to the rule to project PPNR over the planning horizon for each of the economic scenarios defined annually by the regulators. Banking regulations define PPNR as net interest income plus non-interest income less non-interest expense. Management has further adjusted this metric to exclude any non-recurring or non-operational elements of non-interest income or non-interest expense, which are outlined in the table below. Management believes that this is an important metric as it illustrates the underlying performance of the Company, it enables investors and others to assess the Company's ability to generate capital to cover credit losses through the credit cycle, and provides consistent reporting with a key metric used by bank regulatory agencies.

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The following table shows the components of operating PPNR for the three months ended March 31, 2019 and 2018:

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Total non-interest income	$	15,410	$	11,643
Less:
Unrealized gains (losses) on assets measured at fair value, net (1)	2,834		(1,074		)
Total operating non-interest income	12,576		12,717
Plus: net interest income	247,336		214,220
Net operating revenue	$	259,912	$	226,937
Total non-interest expense	$	112,914	$	98,149
Less:
Net loss (gain) on sales / valuations of repossessed and other assets (1)	97		(1,228		)
Total operating non-interest expense	$	112,817	$	99,377
Operating pre-provision net revenue (2)	$	147,095	$	127,560
Plus:
Revenue adjustments	2,834		(1,074		)
Less:
Provision for credit losses	3,500		6,000
Expense adjustments	97		(1,228		)
Income before provision for income taxes	146,332		121,714
Income tax expense	25,536		20,814
Net income	$	120,796	$	100,900

(1) The operating PPNR non-GAAP performance metric is adjusted to exclude the effects of these non-operational items.

(2) There were no adjustments made for non-recurring items during thethree months ended March 31, 2019 and 2018.

Operating Efficiency Ratio

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

	Three Months Ended March 31,
	2019			2018
	(dollars in thousands)
Total operating non-interest expense	$	112,817		$	99,377
Divided by:
Total net interest income	$	247,336		$	214,220
Plus:
Tax equivalent interest adjustment	6,094			5,727
Operating non-interest income	12,576			12,717
Net operating revenue - TEB	$	266,006		$	232,664
Operating efficiency ratio - TEB	42.4		%	42.7		%

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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 and goodwill. 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.

	March 31, 2019			December 31, 2018
	(dollars and shares in thousands)
Total stockholders' equity	$	2,720,620		$	2,613,734
Less: goodwill and intangible assets	298,768			299,155
Total tangible stockholders' equity	2,421,852			2,314,579
Plus: deferred tax - attributed to intangible assets	2,183			1,885
Total tangible common equity, net of tax	$	2,424,035		$	2,316,464
Total assets	$	23,792,846		$	23,109,486
Less: goodwill and intangible assets, net	298,768			299,155
Tangible assets	23,494,078			22,810,331
Plus: deferred tax - attributed to intangible assets	2,183			1,885
Total tangible assets, net of tax	$	23,496,261		$	22,812,216
Tangible common equity ratio	10.3		%	10.2		%
Common shares outstanding	104,483			104,949
Book value per share	$	26.04		$	24.90
Tangible book value per share, net of tax	23.20			22.07

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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.

	March 31, 2019			December 31, 2018
	(dollars in thousands)
Common Equity Tier 1:
Common Equity	$	2,720,620		$	2,613,734
Less:
Non-qualifying goodwill and intangibles	296,496			296,769
Disallowed deferred tax asset	2,134			768
AOCI related adjustments	(15,695		)	(47,055		)
Unrealized gain on changes in fair value liabilities	7,490			13,432
Common Equity Tier 1	$	2,430,195		$	2,349,820
Divided by: Risk-weighted assets	$	22,610,882		$	21,983,976
Common Equity Tier 1 ratio	10.7		%	10.7		%
Common Equity Tier 1	$	2,430,195		$	2,349,820
Plus:
Trust preferred securities	81,500			81,500
Less:
Disallowed deferred tax asset	—			—
Unrealized gain on changes in fair value liabilities	—			—
Tier 1 capital	$	2,511,695		$	2,431,320
Divided by: Tangible average assets	$	22,867,069		$	22,204,799
Tier 1 leverage ratio	11.0		%	10.9		%
Total Capital:
Tier 1 capital	$	2,511,695		$	2,431,320
Plus:
Subordinated debt	304,903			305,131
Qualifying allowance for credit losses	154,987			152,717
Other	9,224			8,188
Less: Tier 2 qualifying capital deductions	—			—
Tier 2 capital	$	469,114		$	466,036
Total capital	$	2,980,809		$	2,897,356
Total capital ratio	13.2		%	13.2		%
Classified assets to Tier 1 capital plus allowance for credit losses:
Classified assets	$	238,241		$	242,101
Divided by:
Tier 1 capital	2,511,695			2,431,320
Plus: Allowance for credit losses	154,987			152,717
Total Tier 1 capital plus allowance for credit losses	$	2,666,682		$	2,584,037
Classified assets to Tier 1 capital plus allowance	8.9		%	9.4		%

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Net Interest Margin

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

	Three Months Ended March 31,
	2019							2018
	Average Balance			Interest		Average Yield / Cost		Average Balance			Interest		Average Yield / Cost
	(dollars in thousands)
Interest earning assets
Loans:
Commercial and industrial	$	7,538,711		$	109,089	6.03	%	$	6,580,935		$	85,547	5.46	%
CRE - non-owner-occupied	4,211,088			62,441		6.03		3,920,777			56,285		5.84
CRE - owner-occupied	2,327,495			30,084		5.35		2,241,787			28,551		5.28
Construction and land development	2,178,312			39,704		7.41		1,789,356			29,619		6.72
Residential real estate	1,391,109			16,567		4.83		425,267			5,280		5.04
Consumer	62,367			933		6.07		47,935			677		5.73
Total loans (1), (2), (3)	17,709,082			258,818		6.02		15,006,057			205,959		5.67
Securities:
Securities - taxable	2,762,640			20,336		2.99		2,875,345			19,149		2.70
Securities - tax-exempt	895,582			8,798		4.98		836,914			7,472		4.53
Total securities (1)	3,658,222			29,134		3.47		3,712,259			26,621		3.11
Other	450,837			3,216		2.89		425,667			2,117		2.02
Total interest earning assets	21,818,141			291,168		5.53		19,143,983			234,697		5.09
Non-interest earning assets
Cash and due from banks	162,167							142,356
Allowance for credit losses	(154,249		)					(141,030		)
Bank owned life insurance	170,480							168,070
Other assets	1,112,937							990,845
Total assets	$	23,109,476						$	20,304,224
Interest-bearing liabilities
Interest-bearing deposits:
Interest-bearing transaction accounts	$	2,495,848		$	5,583	0.91	%	$	1,654,720		$	1,380	0.34	%
Savings and money market accounts	7,446,639			22,007		1.20		6,226,611			8,915		0.58
Time certificates of deposit	1,817,787			8,198		1.83		1,579,940			3,878		1.00
Total interest-bearing deposits	11,760,274			35,788		1.23		9,461,271			14,173		0.61
Short-term borrowings	315,755			1,939		2.49		351,616			1,335		1.54
Qualifying debt	363,044			6,105		6.82		368,849			4,969		5.46
Total interest-bearing liabilities	12,439,073			43,832		1.43		10,181,736			20,477		0.82
Interest cost of funding earning assets						0.82							0.43
Non-interest-bearing liabilities
Non-interest-bearing demand deposits	7,555,584							7,510,614
Other liabilities	424,998							338,530
Stockholders’ equity	2,689,821							2,273,344
Total liabilities and stockholders' equity	$	23,109,476						$	20,304,224
Net interest income and margin (4)				$	247,336	4.71	%				$	214,220	4.66	%

(1) Yields on loans and securities have been adjusted to a TEB. The taxable-equivalent adjustment was $6.1 million and $5.7 million for the three months ended March 31, 2019 and 2018, respectively.

(2) Included in the yield computation are net loan fees of $12.3 million and accretion on acquired loans of $2.8 million for the three months ended March 31, 2019, compared to $10.0 million and $5.7 million for the three months ended March 31, 2018, respectively.

(3) Includes non-accrual loans.

(4) Net interest margin is computed by dividing net interest income by total average earning assets, annualized on an actual/actual basis.

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	Three Months Ended March 31,
	2019 versus 2018
	Increase (Decrease) Due to Changes in (1)
	Volume			Rate			Total
	(in thousands)
Interest income:
Loans:
Commercial and industrial	$	13,860		$	9,682		$	23,542
CRE - non-owner occupied	4,305			1,851			6,156
CRE - owner-occupied	1,108			425			1,533
Construction and land development	7,089			2,996			10,085
Residential real estate	11,502			(215		)	11,287
Consumer	216			40			256
Total loans	38,080			14,779			52,859
Securities:
Securities - taxable	(830		)	2,017			1,187
Securities - tax-exempt	576			750			1,326
Total securities	(254		)	2,767			2,513
Other	180			919			1,099
Total interest income	38,006			18,465			56,471
Interest expense:
Interest-bearing transaction accounts	$	1,882		$	2,321		$	4,203
Savings and money market	3,606			9,486			13,092
Time certificates of deposit	1,073			3,247			4,320
Short-term borrowings	(220		)	824			604
Qualifying debt	(98		)	1,234			1,136
Total interest expense	6,243			17,112			23,355
Net increase	$	31,763		$	1,353		$	33,116

(1) Changes attributable to both volume and rate are designated as volume changes.

Comparison of interest income, interest expense and net interest margin

The Company's primary source of revenue is interest income. For the three months ended March 31, 2019, interest income was $291.2 million, an increase of $56.5 million, or 24.1%, compared to $234.7 million for the three months ended March 31, 2018. This increase was primarily the result of a $2.70 billion increase in the average loan balance, which, together with the effect of the rising rate environment, drove a $52.9 million increase in loan interest income for the three months ended March 31, 2019. Interest income from investment securities increased by $2.5 million for the comparable period primarily due to an increase in interest rates from March 31, 2018. Average yield on interest earning assets increased to 5.53% for the three months ended March 31, 2019, compared to 5.09% for the same period in 2018, which was primarily the result of loan growth and increased yields on loans and investment securities, attributable to the rising interest rate environment.

For the three months ended March 31, 2019, interest expense was $43.8 million, an increase of $23.4 million, or 114.1%, compared to $20.5 million for the three months ended March 31, 2018. Interest expense on deposits increased $21.6 million for the same period as average interest-bearing deposits increased $2.30 billion, resulting in a 62 basis point increase in average cost of interest-bearing deposits. Interest expense on qualifying debt and short-term borrowings increased $1.1 million and $0.6 million, respectively, for the three months ended March 31, 2019 compared to the three months ended March 31, 2018, due to higher interest rates.

For the three months ended March 31, 2019, net interest income was $247.3 million, an increase of $33.1 million, or 15.5%, compared to $214.2 million for the three months ended March 31, 2018. The increase in net interest income reflects a $2.67 billion increase in average interest-earning assets, partially offset by an increase of $2.26 billion in average interest-bearing liabilities. The increase in net interest margin of 5 basis points to 4.71% is the result of increased yields on loans and investment securities, partially offset by higher deposit and funding costs for the three months ended March 31, 2019, compared to the same period in 2018.

67

Provision for Credit Losses

The provision for credit losses in each period is reflected as a reduction in earnings for 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. For the three months ended March 31, 2019, the provision for credit losses was $3.5 million compared to $6.0 million for the three months ended March 31, 2018. The decrease in the provision for credit losses was driven by loan mix. For the three months ended March 31, 2019, loan growth was driven by residential real estate loans, which carry a lower credit risk profile, compared to construction and land development and commercial and industrial loans, which were the drivers of loan growth for the three months ended March 31, 2018.

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 March 31, 2019 and December 31, 2018, the allowance for credit losses on PCI loans was $0.1 million.

Non-interest Income

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

	Three Months Ended March 31,
	2019		2018			Increase (Decrease)
	(in thousands)
Service charges and fees	$	5,412	$	5,745		$	(333	)
Income from equity investments	2,009		1,460			549
Card income	1,841		1,972			(131		)
Foreign currency income	1,095		1,202			(107		)
Income from bank owned life insurance	981		928			53
Lending related income and gains (losses) on sale of loans, net	251		978			(727		)
Unrealized gains (losses) on assets measured at fair value, net	2,834		(1,074		)	3,908
Other income	987		432			555
Total non-interest income	$	15,410	$	11,643		$	3,767

Total non-interest income for the three months ended March 31, 2019 compared to the same period in 2018, increased by $3.8 million, or 32.4%. The increase in non-interest income is due primarily to unrealized gains on assets measured at fair value of $2.8 million for the three months ended March 31, 2019, compared to an unrealized loss of $1.1 million for the three months ended March 31, 2018. Income from equity investments also increased $0.5 million from an increase in both warrant and SBIC income. These increases were partially offset by a decrease of $0.7 million in lending related income primarily related to $0.4 million in net losses on loan sales for the three months ended March 31, 2019, compared to net gains on loan sales of $0.7 million for the three months ended March 31, 2018.

68

Non-interest Expense

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

	Three Months Ended March 31,
	2019		2018			Increase (Decrease)
	(in thousands)
Salaries and employee benefits	$	68,556	$	62,133		$	6,423
Occupancy	8,227		6,864			1,363
Legal, professional, and directors' fees	7,532		6,003			1,529
Data processing	6,332		5,207			1,125
Deposit costs	5,724		2,926			2,798
Insurance	2,809		3,869			(1,060		)
Business development	2,085		1,728			357
Loan and repossessed asset expenses	2,006		583			1,423
Marketing	741		596			145
Card expense	634		942			(308		)
Intangible amortization	387		398			(11		)
Net loss (gain) on sales / valuations of repossessed and other assets	97		(1,228		)	1,325
Other expense	7,784		8,128			(344		)
Total non-interest expense	$	112,914	$	98,149		$	14,765

Total non-interest expense for the three months ended March 31, 2019, compared to the same period in 2018, increased$14.8 million, or 15.0%. This increase primarily relates to salaries and employee benefits, deposit costs, and legal, professional, and directors' fees. Salaries and employee benefits have increased as the Company supports its continued growth. Full-time equivalent employees increased 3.5% from 1,713 at March 31, 2018, compared to 1,773 at March 31, 2019. Deposits costs consist of fees to Promontory Interfinancial Network and others for reciprocal deposits as well as earnings credits on select non-interest bearing deposits. The increase in deposit costs for the three months ended March 31, 2019, compared to the same period in 2018, primarily relates to an increase in deposit earnings credits paid to account holders. The increase in legal, professional, and directors' fees largely relates to an increase in consulting fees.

Income Taxes

The effective tax rate was 17.45% and 17.10% for the three months ended March 31, 2019 and 2018, respectively. The increase in the effective tax rate from the three months ended March 31, 2018 is due primarily to an increase in pre-tax book income and a smaller benefit from the excess stock compensation deduction.

69

Business Segment Results

The Company's reportable segments are aggregated primarily based on geographic location, services offered, and markets served. The Company's regional segments, which include Arizona, Nevada, Southern California, and Northern California, provide full service banking and related services to their respective markets. The Company's NBL segments, which include HOA Services, Public & Nonprofit Finance, Technology & Innovation, HFF, and Other NBLs, provide specialized banking services to niche markets. These NBLs are managed centrally and are broader in geographic scope than the Company's other segments, though still predominately located within the Company's core market areas. The Corporate & Other segment consists of corporate-related items, income and expense items not allocated to the Company's other reportable segments, and inter-segment eliminations.

The following tables present selected operating segment information for the periods presented:

			Regional Segments
	Consolidated Company		Arizona		Nevada		Southern California		Northern California
At March 31, 2019	(in millions)
Loans, net of deferred loan fees and costs	$	18,116.7	$	3,653.9	$	2,069.4	$	2,249.8	$	1,197.2
Deposits	20,208.7		5,319.9		4,006.8		2,793.8		2,008.7
At December 31, 2018
Loans, net of deferred loan fees and costs	$	17,710.6	$	3,647.9	$	2,003.5	$	2,161.1	$	1,300.2
Deposits	19,177.4		5,090.2		3,996.4		2,347.5		1,839.1

	(in thousands)
Three Months Ended March 31, 2019
Pre-tax income	$	146,332	$	34,338	$	25,355	$	16,162	$	12,482
Three Months Ended March 31, 2018
Pre-tax income	$	121,714	$	33,033	$	27,662	$	14,428	$	10,751

	National Business Lines
	HOA Services		Public & Nonprofit Finance		Technology & Innovation		Hotel Franchise Finance		Other NBLs		Corporate & Other
At March 31, 2019	(in millions)
Loans, net of deferred loan fees and costs	$	209.4	$	1,561.7	$	1,057.3	$	1,564.9	$	4,549.0	$	4.1
Deposits	2,963.0		—		2,404.7		—		5.3		706.5
At December 31, 2018
Loans, net of deferred loan fees and costs	$	210.0	$	1,547.5	$	1,200.9	$	1,479.9	$	4,154.9	$	4.7
Deposits	2,607.2		—		2,559.0		—		—		738.0

	(in thousands)
Three Months Ended March 31, 2019
Pre-tax income	$	12,304	$	1,557	$	21,793	$	9,747	$	14,034	$	(1,440	)
Three Months Ended March 31, 2018
Pre-tax income	$	7,659	$	1,779	$	14,388	$	10,756	$	12,088	$	(10,830	)

70

BALANCE SHEET ANALYSIS

Total assets increased$683.4 million, or 3.0%, to $23.79 billion at March 31, 2019, compared to $23.11 billion at December 31, 2018. The increase in total assets relates primarily to organic loan growth. Loans increased $406.1 million, or 2.3%, to $18.12 billion at March 31, 2019, compared to $17.71 billion at December 31, 2018. The increase in loans from December 31, 2018 was driven by residential real estate loans of $257.2 million, construction and land development loans of $148.8 million, and CRE non-owner occupied loans of $90.8 million. These increases were partially offset by decreases in CRE owner-occupied loans of $40.0 million, commercial and industrial loans of $38.9 million, and consumer loans of $11.7 million.

Total liabilities increased$576.5 million, or 2.8%, to $21.07 billion at March 31, 2019, compared to $20.50 billion at December 31, 2018. The increase in liabilities is due primarily to an increase in total deposits of $1.03 billion, or 5.4%, to $20.21 billion, all of which is attributable to organic deposit growth. This increase was partially offset by a decrease of $491.0 million in overnight borrowings.

Total stockholders’ equity increased by $106.9 million, or 4.1%, to $2.72 billion at March 31, 2019, compared to $2.61 billion at December 31, 2018. The increase in stockholders' equity relates primarily to net income for the three months ended March 31, 2019 and an increase in the fair value of the Company's AFS portfolio, which is recognized as part of AOCI, partially offset by share repurchases.

Investment securities

Debt 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 debt 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. Trading securities are reported at fair value, with unrealized gains and losses included in current period earnings.

The Company's investment securities portfolio 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: 

	March 31, 2019		December 31, 2018
	(in thousands)
Debt securities
CDO	$	15,026	$	15,327
Commercial MBS issued by GSEs	99,099		100,106
Corporate debt securities	97,042		99,380
Private label residential MBS	935,347		924,594
Residential MBS issued by GSEs	1,492,236		1,530,124
Tax-exempt	847,855		841,573
Trust preferred securities	28,617		28,617
U.S. government sponsored agency securities	38,901		38,188
U.S. treasury securities	989		1,984
Total debt securities	$	3,555,112	$	3,579,893
Equity securities
CRA investments	$	51,614	$	51,142
Preferred stock	66,391		63,919
Total equity securities	$	118,005	$	115,061

71

Loans

The table below summarizes the distribution of the Company’s held for investment loan portfolio: 

	March 31, 2019			December 31, 2018
	(in thousands)
Commercial and industrial	$	7,723,695		$	7,762,642
Commercial real estate - non-owner occupied	4,304,261			4,213,428
Commercial real estate - owner occupied	2,285,340			2,325,380
Construction and land development	2,283,527			2,134,753
Residential real estate	1,461,561			1,204,355
Consumer	58,364			70,071
Loans, net of deferred loan fees and costs	18,116,748			17,710,629
Allowance for credit losses	(154,987		)	(152,717		)
Total loans HFI	$	17,961,761		$	17,557,912

Net deferred loan fees and costs as of March 31, 2019 and December 31, 2018 total $34.8 million and $36.3 million, respectively, which is a reduction in the carrying value of loans. Net unamortized purchase discounts on secondary market loan purchases total $8.2 million and $2.0 million as of March 31, 2019 and December 31, 2018, respectively. Total loans held for investment are also net of interest rate and credit marks on acquired loans, which are a net reduction in the carrying value of loans. Interest rate marks were $6.1 million and $7.1 million as of March 31, 2019 and December 31, 2018, respectively. Credit marks were $13.1 million and $14.6 million as of March 31, 2019 and December 31, 2018, respectively.

Concentrations of Lending Activities

The Company monitors concentrations within four broad categories: geography, industry, product, and collateral. The Company’s loan portfolio includes significant credit exposure to the CRE market. As of each of the periods ended March 31, 2019 and December 31, 2018, CRE related loans accounted for approximately 49% of total loans. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 35% and 36% of these CRE loans, excluding construction and land loans, were owner-occupied at March 31, 2019 and December 31, 2018, 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. 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 the Company's 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 increased by $31.6 million, or 48.7%, at March 31, 2019 to $96.4 million from $64.8 million at December 31, 2018. 

	March 31, 2019			December 31, 2018
	(dollars in thousands)
Total non-accrual loans (1)	$	43,887		$	27,746
Loans past due 90 days or more on accrual status	—			594
Accruing troubled debt restructured loans	52,488			36,458
Total nonperforming loans, excluding loans acquired with deteriorated credit quality	96,375			64,798
Other impaired loans	47,023			47,454
Total impaired loans	$	143,398		$	112,252
Other assets acquired through foreclosure, net	$	17,707		$	17,924
Non-accrual loans to gross loans held for investment	0.24		%	0.16		%
Loans past due 90 days or more on accrual status to gross loans held for investment	—			0.00

(1) Includes non-accrual TDR loans of $16.4 million and $8.0 million at March 31, 2019 and December 31, 2018, respectively.

72

Interest income received on non-accrual loans was $0.4 million for each of the three months ended March 31, 2019 and 2018. Interest income that would have been recorded under the original terms of non-accrual loans was $0.3 million and $0.6 million for the three months ended March 31, 2019 and 2018, respectively.

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

	March 31, 2019						December 31, 2018
	Non-accrual Balance		Percent of Non-Accrual Balance		Percent of Total Loans		Non-accrual Balance		Percent of Non-Accrual Balance		Percent of Total Loans
	(dollars in thousands)
Commercial and industrial	$	31,074	70.81	%	0.17	%	$	15,090	54.39	%	0.09	%
Commercial real estate	1,000		2.28		0.01		—		—		—
Construction and land development	3,783		8.62		0.02		476		1.71		0.00
Residential real estate	7,914		18.03		0.04		11,939		43.03		0.07
Consumer	116		0.26		0.00		241		0.87		0.00
Total non-accrual loans	$	43,887	100.00	%	0.24	%	$	27,746	100.00	%	0.16	%

	March 31, 2019				December 31, 2018
	Nonaccrual Loans		Percent of Segment's Total Loans		Nonaccrual Loans		Percent of Segment's Total Loans
	(dollars in thousands)
Arizona	$	5,332	0.15	%	$	8,312	0.23	%
Nevada	5,730		0.28		6,374		0.32
Southern California	3,768		0.17		8,564		0.40
Northern California	14,643		1.22		4,255		0.33
Public & Nonprofit Finance	3,307		0.21		—		—
Technology and Innovation	10,991		1.04		—		—
Other NBLS	116		0.00		241		0.00
Total non-accrual loans	$	43,887	0.24	%	$	27,746	0.16	%

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 March 31, 2019 and December 31, 2018, the aggregate amount of loans classified as impaired was $143.4 million and $112.3 million, respectively. The total specific allowance for credit losses related to these loans was $1.4 million and $0.7 million at March 31, 2019 and December 31, 2018, respectively. The Company had $52.5 million and $36.5 million in loans classified as accruing restructured loans at March 31, 2019 and December 31, 2018, respectively.

73

Impaired loans by segment at March 31, 2019 and December 31, 2018 were as follows:

	March 31, 2019		December 31, 2018
	(in thousands)
Arizona	$	32,217	$	34,899
Nevada	48,973		33,860
Southern California	4,080		8,576
Northern California	15,314		4,928
Public & Nonprofit Finance	3,307		—
Technology & Innovation	39,391		29,748
Other NBLs	116		241
Total impaired loans	$	143,398	$	112,252

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

	March 31, 2019
	Impaired Balance		Percent of Impaired Balance		Percent of Total Loans		Reserve Balance		Percent of Reserve Balance		Percent of Total Allowance
	(dollars in thousands)
Commercial and industrial	$	78,768	54.93	%	0.43	%	$	297	21.89	%	0.19	%
Commercial real estate	20,453		14.26		0.11		—		—		—
Construction and land development	28,615		19.96		0.16		810		59.69		0.52
Residential real estate	15,417		10.75		0.09		250		18.42		0.16
Consumer	145		0.10		—		—		—		—
Total impaired loans	$	143,398	100.00	%	0.79	%	$	1,357	100.00	%	0.88	%

	December 31, 2018
	Impaired Balance		Percent of Impaired Balance		Percent of Total Loans		Reserve Balance		Percent of Reserve Balance		Percent of Total Allowance
	(dollars in thousands)
Commercial and industrial	$	63,896	56.92	%	0.36	%	$	621	91.19	%	0.41	%
Commercial real estate	18,937		16.87		0.11		—		—		—
Construction and land development	9,403		8.38		0.05		—		—		—
Residential real estate	19,744		17.59		0.11		60		8.81		0.04
Consumer	272		0.24		0.00		—		—		—
Total impaired loans	$	112,252	100.00	%	0.63	%	$	681	100.00	%	0.45	%

74

Allowance for Credit Losses

The following table summarizes the activity in the Company's allowance for credit losses for the period indicated: 

	Three Months Ended March 31,
	2019			2018
	(dollars in thousands)
Allowance for credit losses:
Balance at beginning of period	$	152,717		$	140,050
Provision charged to operating expense:
Commercial and industrial	(4,217		)	3,143
Commercial real estate	2,585			1,247
Construction and land development	3,515			1,695
Residential real estate	1,825			(102		)
Consumer	(208		)	17
Total Provision	3,500			6,000
Recoveries of loans previously charged-off:
Commercial and industrial	(477		)	(459		)
Commercial real estate	(453		)	(126		)
Construction and land development	(55		)	(1,388		)
Residential real estate	(93		)	(250		)
Consumer	(5		)	(10		)
Total recoveries	(1,083		)	(2,233		)
Loans charged-off:
Commercial and industrial	2,124			3,517
Commercial real estate	—			—
Construction and land development	—			—
Residential real estate	188			107
Consumer	1			—
Total charged-off	2,313			3,624
Net charge-offs	1,230			1,391
Balance at end of period	$	154,987		$	144,659
Net charge-offs to average loans outstanding	0.03		%	0.04		%
Allowance for credit losses to gross loans	0.86			0.93
Allowance for credit losses to gross organic loans	0.90			1.02

75

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. 

	Commercial and Industrial			Commercial Real Estate			Construction and Land Development			Residential Real Estate			Consumer			Total
	(dollars in thousands)
March 31, 2019
Allowance for credit losses	$	77,254		$	37,867		$	26,083		$	13,006		$	777		$	154,987
Percent of total allowance for credit losses	49.9		%	24.4		%	16.8		%	8.4		%	0.5		%	100.0		%
Percent of loan type to total loans	42.6			36.4			12.6			8.1			0.3			100.0
December 31, 2018
Allowance for credit losses	$	83,118		$	34,829		$	22,513		$	11,276		$	981		$	152,717
Percent of total allowance for credit losses	54.4		%	22.8		%	14.8		%	7.4		%	0.6		%	100.0		%
Percent of loan type to total loans	43.8			36.9			12.1			6.8			0.4			100.0

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 for the year ended December 31, 2018. The following table presents information regarding potential and actual problem loans, consisting of loans graded Special Mention, Substandard, Doubtful, and Loss, but still performing, and excluding acquired loans: 

	March 31, 2019
	Number of Loans	Loan Balance		Percent of Loan Balance		Percent of Total Loans
	(dollars in thousands)
Commercial and industrial	94	$	77,909	40.27	%	0.43	%
Commercial real estate	50	108,166		55.92		0.60
Construction and land development	5	6,921		3.58		0.04
Residential real estate	2	412		0.21		0.00
Consumer	2	40		0.02		0.00
Total	153	$	193,448	100.00	%	1.07	%

	December 31, 2018
	Number of Loans	Loan Balance		Percent of Loan Balance		Percent of Total Loans
	(dollars in thousands)
Commercial and industrial	107	$	125,585	62.37	%	0.71	%
Commercial real estate	42	71,116		35.32		0.40
Construction and land development	3	4,040		2.01		0.02
Residential real estate	1	527		0.26		0.00
Consumer	2	75		0.04		0.00
Total	155	$	201,343	100.00	%	1.13	%

76

Other Assets Acquired Through Foreclosure

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

	Three Months Ended March 31,
	2019
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	19,979		$	(2,055	)	$	17,924
Charitable contribution	(232		)	114			(118		)
Valuation adjustments, net	—			(99		)	(99		)
Balance, end of period	$	19,747		$	(2,040	)	$	17,707
	2018
Balance, beginning of period	$	32,552		$	(4,012	)	$	28,540
Transfers to other assets acquired through foreclosure, net	5,744			—			5,744
Proceeds from sale of other real estate owned and repossessed assets, net	(5,294		)	9			(5,285		)
Valuation adjustments, net	—			(47		)	(47		)
Gains (losses), net (1)	1,242			—			1,242
Balance, end of period	$	34,244		$	(4,050	)	$	30,194

(1) There were zero and $1.0 millioninnet gains related to initial transfers to other assets during the three months ended March 31, 2019 and 2018, respectively.

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. The Company has $17.7 million, $17.9 million, and $30.2 million of such assets at March 31, 2019, December 31, 2018, and March 31, 2018, respectively.

At March 31, 2019 and 2018, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 10 properties at March 31, 2019, compared to 11 at December 31, 2018, and 18 at March 31, 2018.

Goodwill and Other Intangible Assets

Goodwill represents the excess consideration paid for net assets acquired in a business combination over their fair value. Goodwill and other intangible assets acquired in a business combination that are determined to have an indefinite useful life are not subject to amortization, but are subsequently evaluated for impairment at least annually. The Company has goodwill of $289.9 million and intangible assets totaling $8.9 million at March 31, 2019, which have been allocated to the Nevada, Northern California, Technology & Innovation, and HFF operating segments.

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 months ended March 31, 2019 and 2018, there were no events or circumstances that indicated an interim impairment test of goodwill or other intangible assets was necessary.

Deferred Tax Assets

As of March 31, 2019, the net deferred tax asset was $22.3 million, a decrease of $9.7 million from December 31, 2018. This overall decrease in the net deferred tax asset was primarily the result of an increase in the fair market value of AFS securities.

At March 31, 2019 and December 31, 2018, the Company had a $2.4 million deferred tax valuation allowance related to net capital loss carryovers.

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Deposits

Deposits are the primary source for funding the Company's asset growth. Total deposits increased to $20.21 billion at March 31, 2019, from $19.18 billion at December 31, 2018, an increase of $1.03 billion, or 5.4%. The increase in deposits is attributable to an increase across most deposit types, with the largest increases in savings and money market deposits of $467.6 million, time deposits of $396.3 million, and non-interest bearing deposits of $223.2 million from December 31, 2018, partially offset by a decrease in interest-bearing deposits of $55.9 million.

At March 31, 2019 and December 31, 2018, the Company also has $710.3 million and $718.2 million, respectively, of wholesale brokered deposits. In addition, non-interest bearing deposits for which the Company provides account holders with earnings credits totaled $2.79 billion and $2.29 billion at March 31, 2019 and December 31, 2018, respectively. The Company incurred $5.5 millionand $2.7 million in deposit related costs during the three months ended March 31, 2019 and 2018, respectively.

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

	Three Months Ended March 31,
	2019				2018
	Average Balance		Rate		Average Balance		Rate
	(dollars in thousands)
Interest-bearing transaction accounts	$	2,495,848	0.91	%	$	1,654,720	0.34	%
Savings and money market accounts	7,446,639		1.20		6,226,611		0.58
Time certificates of deposit	1,817,787		1.83		1,579,940		1.00
Total interest-bearing deposits	11,760,274		1.23		9,461,271		0.61
Non-interest-bearing demand deposits	7,555,584		—		7,510,614		—
Total deposits	$	19,315,858	0.75	%	$	16,971,885	0.34	%

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 customer repurchase agreements. The Company’s borrowing capacity with the FHLB 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 March 31, 2019, total short-term borrowed funds consist of customer repurchase agreements of $15.1 million. At December 31, 2018, total short-term borrowed funds consisted of federal funds purchased of $256.0 million, FHLB overnight advances of $235.0 million, and customer repurchase agreements of $22.4 million.

As of March 31, 2019 and December 31, 2018, the Company did not have any borrowings classified as long-term.

Qualifying Debt

Qualifying debt consists of subordinated debt and junior subordinated debt, inclusive of issuance costs and fair market value adjustments. At March 31, 2019, the carrying value of qualifying debt was $374.0 million, compared to $360.5 million at December 31, 2018.

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Capital Resources

The Company and the Bank 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 the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities, and certain off-balance sheet items (discussed in "Note 13. Commitments and Contingencies" to the Unaudited Consolidated Financial Statements) 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. The capital conservation buffer was established, and began being phased in on January 1, 2016 at 0.625% of risk-weighted assets and increased 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 March 31, 2019 and December 31, 2018, the Company and the Bank 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 the Bank 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)
March 31, 2019
WAL	$	2,980,809	$	2,511,695	$	22,610,882	$	22,867,069	13.2	%	11.1	%	11.0	%	10.7	%
WAB	2,708,654		2,394,443		22,666,493		22,901,348		12.0		10.6		10.5		10.6
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5
December 31, 2018
WAL	$	2,897,356	$	2,431,320	$	21,983,976	$	22,204,799	13.2	%	11.1	%	10.9	%	10.7	%
WAB	2,628,650		2,317,745		22,040,765		22,209,700		11.9		1.5		10.4		10.5
Well-capitalized ratios									10.0		8.0		5.0		6.5
Minimum capital ratios									8.0		6.0		4.0		4.5

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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, 2018, 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 the Company's 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. The Company's liquidity, represented by cash and amounts due from banks, federal funds sold, and non-pledged marketable securities, is a result of the Company's operating, investing, and financing activities and related cash flows. In order to ensure funds are available when necessary, on at least a quarterly basis, the Company projects the amount of funds that will be required over a twelve-month period and it also strives 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 on the Company's lines of credit:

	March 31, 2019
	Available Balance		Outstanding Balance
	(in millions)
Unsecured fed funds credit lines at correspondent banks
Committed amounts	$	261.0	$	—
Uncommitted amounts	694.0		—
Total other lines with correspondent banks	$	955.0	$	—

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 March 31, 2019 are presented in the following table:

	March 31, 2019
	(in millions)
FHLB:
Borrowing capacity	$	3,150.1
Outstanding borrowings	—
Letters of credit	181.0
Total available credit	$	2,969.1
FRB:
Borrowing capacity	$	1,319.8
Outstanding borrowings	—
Total available credit	$	1,319.8

The Company has a formal liquidity policy and, in the opinion of management, its liquid assets are considered adequate to meet cash flow needs for loan funding and deposit cash withdrawals for the next 90-120 days. At March 31, 2019, there was $3.11 billion in liquid assets, comprised of $770.2 million in cash, cash equivalents, and federal funds sold and $2.34 billion in unpledged marketable securities. At December 31, 2018, the Company maintained $3.03 billion in liquid assets, comprised of $498.6 million of cash, cash equivalents, and money market investments, and $2.53 billion of unpledged marketable securities.

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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 the Company's analysis of Parent liquidity, it is assumed 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 non-discretionary 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 twelve 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 its 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 March 31, 2019, the Company's 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 three months ended March 31, 2019 and 2018, net cash provided by operating activities was $151.3 million and $88.3 million, respectively.

The Company's primary investing activities are the origination of real estate and commercial loans, the collection of repayments of these loans, and the purchase and sale of securities. The Company's net cash provided by and used in investing activities has been primarily influenced by its loan and securities activities. The net increase in loans for the three months ended March 31, 2019 and 2018 was $385.5 million and $367.4 million, respectively. There was a net decrease in investment securities for the three months ended March 31, 2019 and 2018 of $63.4 million and $29.7 million, respectively.

Net cash provided by financing activities has been impacted significantly by increased deposit levels. During the three months ended March 31, 2019 and 2018, net deposits increased $1.03 billion and $382.0 million, respectively.

Fluctuations in core deposit levels may increase the Company's 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, the Company is 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, the Company participates in 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 March 31, 2019, the Company has $323.6 million of CDARS and $660.9 million of ICS deposits.

As of March 31, 2019, the Company has $710.3 million of wholesale brokered deposits outstanding. Brokered deposits are generally considered to be deposits that have been received from a third party who is engaged in the business of placing deposits on behalf of others. A traditional deposit broker will direct 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 not relationship based and 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. During the three months ended March 31, 2019, WAB paid dividends to the Parent of $40.0 million. Subsequent to March 31, 2019, WAB paid dividends to the Parent of $30.0 million.

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Recent accounting pronouncements

See "Note 1. Summary of Significant Accounting Policies," of the Notes to Unaudited Consolidated Financial Statements contained in Item 1. Financial Statements for information on recent and recently adopted accounting pronouncements and their expected impact, if any, on the Company's Consolidated Financial Statements.

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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. The Company's market risk arises primarily from interest rate risk inherent in its lending, investing, and deposit taking activities. To that end, management actively monitors and manages the Company's interest rate risk exposure. The Company generally manages its interest rate sensitivity by evaluating re-pricing opportunities on its earning assets to those on its funding liabilities.

Management uses various asset/liability strategies to manage the re-pricing characteristics of the Company's assets and liabilities, all of which are designed to ensure that exposure to interest rate fluctuations is limited to within the Company's guidelines of acceptable levels of risk-taking. Hedging strategies, including the terms and pricing of loans and deposits and management of the deployment of its 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, 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. The Company manages its balance sheet in part to maintain the potential impact on EVE and net interest income within acceptable ranges despite changes in interest rates.

The Company's 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 its 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 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 March 31, 2019, the Company uses a simulation model to project changes in net interest income that result from forecasted changes in interest rates. This analysis calculates the difference between a baseline net interest income forecast using current yield curves that do not take into consideration any future anticipated rate hikes, compared to forecasted net income resulting from an immediate parallel shift in rates upward or downward, along with other scenarios directed by ALCO. The income simulation model includes various assumptions regarding the re-pricing relationships for each of the Company's products. Many of the Company's 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, including the impact of caps or floors. Some loans and investments contain contractual prepayment features (embedded options) and, accordingly, the simulation model incorporates prepayment assumptions. The Company's non-term deposit products re-price more slowly, usually changing less than the change in market rates and at the Company's 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 the Company's results, including changes by management to mitigate interest rate changes or secondary factors, such as changes to the Company's 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 the Company's 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 over a twelve-month period. At March 31, 2019, the Company's net interest income exposure for the next twelve months related to these hypothetical changes in market interest rates was within the Company's current guidelines for all up-rate scenarios. The Company’s net interest income exposure in the down-rate scenario was not within the Company’s guideline of (5.0)%. The breach is the result of the increase in short-term interest rates over the past two years, resulting from fed funds rate increases. These rate increases have improved yields on floating-rate assets, while the Company’s deposit costs have not increased materially; thus in a current down-rate scenario, the Company will not see the full impact of a rate decrease on its deposit costs while it will see that impact on floating-rate assets. The Board and ALCO have accepted the breach and believe that as deposit costs increase over time, interest expense will be more sensitive in a down-rate scenario, dampening the Company’s overall net interest income sensitivity.

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	$	1,095,269		$	1,209,475	$	1,334,788		$	1,458,891		$	1,583,245		$	1,708,597
Interest Expense	143,884			191,537		243,275			295,011			346,741			398,465
Net Interest Income	$	951,385		$	1,017,938	$	1,091,513		$	1,163,880		$	1,236,504		$	1,310,132
% Change	(6.5		)%			7.2		%	14.3		%	21.5		%	28.7		%

Economic Value of Equity. The Company measures the impact of market interest rate changes on the NPV of estimated cash flows from its assets, liabilities, and off-balance sheet items, defined as EVE, using a simulation model. This simulation model 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 March 31, 2019, the Company's EVE exposure related to these hypothetical changes in market interest rates was within the Company's current guidelines. The following table shows the Company's projected change in EVE for this set of rate shocks at March 31, 2019:

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	$	24,364,198		$	23,897,897	$	23,399,623		$	22,921,308		$	22,486,388		$	22,063,822
Liabilities	19,585,436			19,098,672		18,708,135			18,370,937			18,076,868			17,819,255
Net Present Value	$	4,778,762		$	4,799,225	$	4,691,488		$	4,550,371		$	4,409,520		$	4,244,567
% Change	(0.4		)%			(2.2		)%	(5.2		)%	(8.1		)%	(11.6		)%

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 the Company 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 as of March 31, 2019 and December 31, 2018:

Outstanding Derivatives Positions

March 31, 2019						December 31, 2018
Notional		Net Value			Weighted Average Term (Years)	Notional		Net Value			Weighted Average Term (Years)
(dollars in thousands)
$	1,005,954	$	(47,141	)	15.7	$	1,017,773	$	(42,477	)	15.8

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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 it files or submits under the Exchange Act, as amended, is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms. Additionally, the Company's disclosure controls and procedures were also effective in ensuring that information required to be disclosed by the Company in the reports it files or is subject to under the Exchange Act is accumulated and communicated to the Company's management, including the CEO and CFO, to allow timely decisions regarding required disclosures.

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 March 31, 2019, which have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

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 its properties are subject. There are no material proceedings known to the Company to be contemplated by any governmental authority. From time to time, the Company is involved in a variety of litigation matters in the ordinary course of its business and anticipates that it 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, 2018.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Issuer Purchases of Equity Securities

The following table provides information about the Company's purchases of equity securities that are registered by the Company pursuant to Section 12 of the Exchange Act for the periods indicated:

	(a)	(b)		( c)	(d)
	Total Number of Shares Purchased (1)(2)	Average Price Paid Per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)	Approximate Dollar Value of Shares That May Yet be Purchased Under the Plans or Programs
1/1/2019 through 1/31/2019	99,757	$	45.15	—	214,339,618
2/1/2019 through 2/28/2019	—	—		—	214,339,618
3/1/2019 through 3/31/2019	1,014,165	40.74		940,915	176,418,392
Total	1,113,922	$	41.13	940,915	176,418,392

(1) Shares purchased during the period outside of the publicly announced repurchase program were transferred to the Company from employees in satisfaction of minimum tax withholding obligations associated with the vesting of restricted stock awards during the period.

(2) On December 12, 2018, the Company announced that it had adopted a common stock repurchase program, pursuant to which the Company is authorized to repurchase up to $250 million of its shares of common stock. The repurchase program will expire on December 31, 2019.

Item 5. Other Information

Not applicable.

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Item 6. Exhibits

EXHIBITS

3.1	Amended and Restated Certificate of Incorporation, effective as of May 19, 2015 (incorporated by reference to Exhibit 3.1 of Western Alliance's Form 10-K filed with the SEC on March 1, 2019.
3.2	Amended and Restated Bylaws of Western Alliance, 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).
3.3	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).
3.4	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).
10.1*	Employment Letter Agreement, dated February 1, 2018, by and between Barbara J. Kennedy and Western Alliance. ±
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.
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.

± Management contract or compensatory arrangement.

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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
April 30, 2019	By:	/s/ Kenneth A. Vecchione
		Kenneth A. Vecchione
		Chief Executive Officer
April 30, 2019	By:	/s/ Dale Gibbons
		Dale Gibbons
		Vice Chairman
		Chief Financial Officer
April 30, 2019	By:	/s/ J. Kelly Ardrey Jr.
		J. Kelly Ardrey Jr.
		Senior Vice President and
		Chief Accounting Officer

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EX-10.1

Exhibit 10.1

Barbara J. Kennedy

Subject:Terms of Employment

Dear Barbara:

This letter sets forth our agreement regarding the terms of your employment to fill the position of EVP and Chief Human Resources Officer of Western Alliance Bank (“WAB”) and Western Alliance Bancorporation (“WAL”) (collectively WAB and WAL are the “Company”).

Position/Duties: You will serve as Executive Vice President and Chief Human Resources Officer of the Company and will report to Kenneth A. Vecchione, the Company’s CEO. Start of employment shall be on or before April 16, 2018 (“Employment Date”). You will also serve as a member of the Senior Operating Committee (SOC).

Base Salary: Beginning on hire date, your base salary will be $355,000 annually.

Long Term Incentive: On your hire date, you will be eligible for annual grants of restricted stock under WAL’s 2005 Stock Incentive Plan (as amended) in accordance with our standard compensation policies and practices as these may change from time to time. Your 2018 equity grant will consist of 3,000 shares and a three year vesting schedule. Those shares will vest 50% at the end of year two and 50% at the end of year three. You will also be granted 3,000 shares of performance-based stock units with a three year performance period. The performance-based stock units will cliff vest at the end of a three year performance period if the cumulative EPS and relative TSR thresholds are achieved. You will also be granted 10,000 shares of restricted stock with a four year vesting cycle vesting 25% per year. Both one-time grants and the annual stock grants are subject to approval by the WAL Compensation Committee.

Annual Bonus: You will be eligible to participate in the WAL Annual Bonus Plan and will be eligible for an annual cash award based on the Company’s annual performance relative to pre-established targets that are subject to the WAL Compensation Committee’s review and approval. As EVP/CHRO of the Company, your target bonus percentage for 2018 will be 65% of your Base Salary, and payment will be prorated based on base salary received in 2018.

Change in Control: As an Executive Vice President of WAL, you will be eligible to participate in the Change in Control (CIC) plan. The CIC Plan provides for the payment of severance benefits upon a “double trigger” event. Following a double trigger event, benefits are payable in a lump sum cash payment equal to two times the sum of your base salary and target annual bonus amount.

Auto Allowance: You will be eligible for a monthly auto allowance beginning April 16, 2018 or before (hire date) equal to $1,000/month.

Benefits: Subject to proper documentation and applicable Company policies, you will be reimbursed for ordinary and necessary business expenses. You will be able to participate in any group benefits plan established by the Company for which you are or may be eligible, including medical plans, disability insurance plans, life insurance plans, 401(k), restoration plans, profit sharing or other similar plans. You will also be covered as an executive officer under the Company’s D&O insurance policy. These benefits are governed by the terms and conditions contained in the applicable plans or policies, and they are subject to change or discontinuation at any time.

No Restrictions: You represent and warrant that you are not subject to any non-competition, non-solicitation or similar obligations to any former employer that could impair your ability to perform your duties and responsibilities in connection with the Company. In addition, you agree that you will not use or disclose any confidential or proprietary information of any former employer in performing these duties and responsibilities. You also agree to execute such documentation and to comply with such procedures as the Company may require or establish from time to time to confirm the above representations and warranties and ensure your compliance with these obligations.

Confidentiality: You agree to hold in the strictest confidence all confidential business information of the Company, including, without limitation, information relating to customers, employees, costs, marketing, trading, investment, sales activities, promotion, credit and financial data, financing methods, or plans of the Company and will not disclose or communicate (directly or indirectly) any such information to any other person, firm or corporation in any manner whatsoever without the Company’s prior written consent.

Governing Law: The terms of your employment shall be governed by the laws of the State of Arizona for so long as you are an employee of WAL and, thereafter, by the laws of the State in which WAL’s successor in interest has its main office.

Employment Policies: You agree to observe and comply with all applicable Company policies and guidelines, including, without limitation, WAL’s Employee Guide, Code of Business Conduct and Ethics, and Related Party Transactions Policy.

Screening: Your employment and these terms are subject to your successful completion of WAL’s drug testing, fingerprinting and other pre-employment background check requirements.

If you agree to these terms, please sign where indicated below.

Sincerely,

/s/ Kenneth A. Vecchione

Kenneth A. Vecchione

CEO/Western Alliance Bank

AGREED:

/s/ Barbara J. Kennedy

Barbara J. Kennedy

Dated: February 7, 2018

EX-31.1

EXHIBIT 31.1

CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER

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

I, Kenneth A. Vecchione, 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/ Kenneth A. Vecchione
		Kenneth A. Vecchione
		Chief Executive Officer
Date:	April 30, 2019	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:	April 30, 2019	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 quarter ended March 31, 2019, 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:	April 30, 2019	/s/ Kenneth A. Vecchione
		Chief Executive Officer
		Western Alliance Bancorporation
Date:	April 30, 2019	/s/ Dale Gibbons
		Chief Financial Officer
		Western Alliance Bancorporation

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 25, 2019
Entity Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Entity Emerging Growth Company	false
Entity Small Business	false
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Trading Symbol	WAL
Entity Registrant Name	WESTERN ALLIANCE BANCORPORATION
Entity Central Index Key	0001212545
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		104,473,076

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Assets:
Cash and due from banks	$ 160,329	$ 180,053
Interest-bearing deposits in other financial institutions	335,282	318,519
Federal Funds Sold	290,000	0
Cash, cash equivalents, and restricted cash	785,611	498,572
Money Market Funds, at Carrying Value	0	7
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247	3,276,988
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	310,865	302,905
Investment securities - equity	118,005	115,061
Investments in restricted stock, at cost	66,287	66,132
Loans:
Loans, net of deferred loan fees and costs	18,116,748	17,710,629
Less: Allowance for credit losses	(154,987)	(152,717)
Net loans held for investment	17,961,761	17,557,912
Premises and equipment, net	119,827	119,474
Operating Lease, Right-of-Use Asset	72,841	0
Other assets acquired through foreclosure, net	17,707	17,924
Bank owned life insurance	171,126	170,145
Goodwill	289,895	289,895
Other intangible assets, net	8,873	9,260
Deferred tax assets, net	22,309	31,990
Amortization Method Qualified Affordable Housing Project Investments	331,972	342,381
Other assets	271,520	310,840
Total assets	23,792,846	23,109,486
Deposits:
Non-interest-bearing demand	7,679,361	7,456,141
Interest-bearing	12,529,379	11,721,306
Total deposits	20,208,740	19,177,447
Customer repurchase agreements	15,141	22,411
Other borrowings	0	491,000
Qualifying debt	373,996	360,458
Operating Lease, Liability	77,750	0
Other liabilities	396,599	444,436
Total liabilities	21,072,226	20,495,752
Commitments and Contingencies
Stockholders’ equity:
Common stock - par value $0.0001; 200,000,000 authorized; 106,449,184 shares issued at March 31, 2019 and 106,741,870 at December 31, 2018	10	10
Treasury stock, at cost (1,966,238 shares at March 31, 2019 and 1,793,231 shares at December 31, 2018)	(60,983)	(53,083)
Additional paid in capital	1,390,569	1,417,724
Accumulated other comprehensive (loss)	(8,191)	(33,622)
Retained earnings	1,399,215	1,282,705
Total stockholders’ equity	2,720,620	2,613,734
Total liabilities and stockholders’ equity	$ 23,792,846	$ 23,109,486

XML

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale, Amortized Cost	$ 3,265,546	$ 3,339,888
Debt Securities, Held-to-maturity, Fair Value	$ 331,083	$ 298,648
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	106,449,184	106,741,870
Common stock, shares outstanding	104,482,946	104,948,639

XML

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Interest income:
Loans, including fees	$ 258,818	$ 205,959
Investment securities	28,178	25,772
Dividends	1,633	1,478
Other	2,539	1,488
Total interest income	291,168	234,697
Interest expense:
Deposits	35,788	14,173
Other borrowings	1,277	1,326
Qualifying debt	6,105	4,969
Other	662	9
Total interest expense	43,832	20,477
Net interest income	247,336	214,220
Provision for credit losses	3,500	6,000
Net interest income after provision for credit losses	243,836	208,220
Non-interest income:
Service charges and fees	5,412	5,745
Foreign currency income	2,009	1,460
Card Income	1,841	1,972
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	1,095	1,202
Income from bank owned life insurance	981	928
Lending related income and gains (losses) on sale of loans, net	251	978
Equity Securities, FV-NI, Unrealized Gain (Loss)	2,834	(1,074)
Other income	987	432
Total non-interest income	15,410	11,643
Non-interest expense:
Salaries and employee benefits	68,556	62,133
Occupancy	8,227	6,864
Legal, professional, and directors' fees	7,532	6,003
Data processing	6,332	5,207
Deposit costs	5,724	2,926
Insurance	2,809	3,869
Business development	2,085	1,728
Loan and repossessed asset expenses	2,006	583
Marketing	634	942
Card expense	741	596
Intangible amortization	387	398
Net loss (gain) on sales / valuations of repossessed and other assets	97	(1,228)
Other expense	7,784	8,128
Total non-interest expense	112,914	98,149
Income before provision for income taxes	146,332	121,714
Income tax expense	25,536	20,814
Net income	$ 120,796	$ 100,900
Earnings per share:
Basic	$ 1.16	$ 0.97
Diluted	$ 1.16	$ 0.96
Weighted average number of common shares outstanding:
Basic	104,033	104,530
Diluted	104,475	105,324

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 120,796	$ 100,900
Other comprehensive income (loss), net:
Unrealized gain (loss) on AFS securities, net of tax effect of $(10,222) and $12,714, respectively	31,377	(38,914)
Unrealized (loss) gain on SERP, net of tax effect of $6 and $2, respectively	(18)	(11)
Unrealized (loss) gain on junior subordinated debt, net of tax effect of $1,934 and $(478), respectively	(5,928)	1,466
Net other comprehensive income (loss)	25,431	(37,459)
Comprehensive income	$ 146,227	$ 63,441

XML

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized gain on securities available-for-sale securities, tax	$ 10,222	$ (12,714)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax	6	2
Unrealized (loss) gain on junior subordinated debt, net of tax effect of $661, $(394), $(61), and $1,649, respectively	1,934	(478)
Realized gain on sale of securities, tax	$ 0	$ 0

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid in Capital [Member]	Treasury Stock [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Accumulated (Deficit) [Member]	Restricted Stock [Member]	Performance Shares [Member]	Executive Officer [Member] Restricted Stock [Member]
Stock Granted, Value, Share-based Compensation, Gross							$ 21,900
Allocated Share-based Compensation Expense								$ 1,600	$ 600
Beginning balance at Dec. 31, 2017	$ 2,229,698	$ 10	$ 1,424,540	$ (40,173)	$ (3,145)	$ 848,466
Beginning balance, shares at Dec. 31, 2017		105,487,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	100,900					100,900
Exercise of stock options, shares		9,000
Exercise of stock options	215		215
Restricted stock grants, net, shares		546,000
Restricted stock grants, net	$ 6,705		6,705
Treasury Stock, Shares, Acquired	(180,867)	(181,000)
Treasury Stock Acquired, Average Cost Per Share	$ 59.02
Restricted Stock Award, Forfeitures	$ (6,296)			6,296
Other comprehensive (loss) income, net	(37,459)				(37,459)
Ending Balance at Mar. 31, 2018	2,293,763	$ 10	1,431,460	(46,469)	(41,662)	950,424
Ending balance, shares at Mar. 31, 2018		105,861,000
Retained earnings	1,282,705
Stock Granted, Value, Share-based Compensation, Gross							20,700
Allocated Share-based Compensation Expense							$ 4,300	$ 1,700	$ 500
Beginning balance at Dec. 31, 2018	2,613,734	$ 10	1,417,724	(53,083)	(33,622)	1,282,705
Beginning balance, shares at Dec. 31, 2018		104,949,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	120,796					120,796
Exercise of stock options, shares		1,000
Exercise of stock options	36		36
Restricted stock grants, net, shares		647,000
Restricted stock grants, net	$ 6,472		6,472
Treasury Stock, Shares, Acquired	(173,007)	(173,000)
Treasury Stock Acquired, Average Cost Per Share	$ 0
Restricted Stock Award, Forfeitures	$ (7,900)			(7,900)
Stock Repurchased and Retired During Period, Shares	941,000	(941,000)
Stock Repurchased and Retired During Period, Value	$ (37,949)		(33,663)			(4,286)
Other comprehensive (loss) income, net	25,431				25,431
Ending Balance at Mar. 31, 2019	2,720,620	$ 10	$ 1,390,569	$ (60,983)	$ (8,191)	$ 1,399,215
Ending balance, shares at Mar. 31, 2019		104,483,000
Retained earnings	$ 1,399,215

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 120,796	$ 100,900
Adjustments to reconcile net income to cash provided by operating activities:
Provision for credit losses	3,500	6,000
Depreciation and amortization	4,209	3,407
Stock-based compensation	6,472	6,705
Deferred income taxes	1,398	(9,372)
Amortization of net premiums for investment securities	3,004	3,920
Amortization of tax credit investments	10,145	8,128
Operating Lease, Expense	2,601	0
Accretion of fair market value adjustments on loans acquired from business combinations	(2,817)	(5,738)
Accretion and amortization of fair market value adjustments on other assets and liabilities acquired from business combinations	463	475
Income from bank owned life insurance	(981)	(928)
Losses / (Gains) on:
Assets measured at fair value, net	(2,834)	1,074
Sale of loans	408	(678)
Other assets acquired through foreclosure, net	0	(1,242)
Valuation adjustments of other repossessed assets, net	99	47
Sale of premises, equipment, and other assets, net	(2)	(33)
Changes in:
Other assets	(33,071)	5,773
Other liabilities	37,924	(30,122)
Net cash provided by operating activities	151,314	88,316
Investment securities - AFS
Purchases	(26,342)	(67,949)
Principal pay downs and maturities	97,732	105,242
Debt Securities, Held-to-maturity [Abstract]
Purchases	10,825	7,800
Principal pay downs and maturities	2,868	243
Equity Securities, FV-NI, Gain (Loss) [Abstract]
Reinvestments of dividend proceeds	(151)	0
Purchase of investment tax credits	(24,400)	(13,376)
Purchase of SBIC investments	1,570	263
Sale (purchase) of money market investments, net	7	(5)
Sale (purchase) of money market investments, net	0	72
(Purchase) liquidation of restricted stock, net	155	734
Loan fundings and principal collections, net	(385,497)	(367,437)
Purchase of premises, equipment, and other assets, net	(3,152)	(576)
Proceeds from sale of other real estate owned and repossessed assets, net	0	5,285
Net cash used in investing activities	(351,485)	(347,298)
Net cash used in investing activities
Net increase (decrease) in deposits	1,031,293	382,006
Net increase (decrease) in borrowings	(498,270)	(94,340)
Proceeds from exercise of common stock options	36	215
Cash paid for tax withholding on vested restricted stock	(7,900)	(6,296)
Payments for Repurchase of Common Stock	37,949	0
Net cash provided by financing activities	487,210	281,585
Net increase (decrease) in cash, cash equivalents, and restricted cash	287,039	22,603
Cash, cash equivalents, and restricted cash at beginning of period	498,572	416,768
Cash, cash equivalents, and restricted cash at end of period	785,611	439,371
Cash paid (received) during the period for:
Interest	43,832	25,303
Income Taxes Paid, Net	(34,619)	9,881
Non-cash operating, investing, and financing activity:
Transfers to other assets acquired through foreclosure, net	0	5,744
Unfunded commitments originated	1,735	30,000
Unrealized gain (loss) on AFS securities, net of tax effect of $(10,222) and $12,714, respectively	31,377	(38,914)
Unrealized (loss) gain on junior subordinated debt, net of tax effect of $1,934 and $(478), respectively	(5,928)	1,466
Net increase (decrease) in unfunded obligations	$ 12,787	$ 120,512

XML

Summary of Significant Accounting Policies

3 Months Ended

Mar. 31, 2019

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

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, international banking, and online banking products and services through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services. In addition, the Company has two non-bank subsidiaries, LVSP, which holds and manages certain OREO properties, and a captive insurance company formed and licensed under the laws of the State of Arizona, CSI. CSI was established as part of the Company's overall enterprise risk management strategy.

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 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. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; certain assets and liabilities carried at fair value; and accounting for income taxes.

Principles of consolidation

As of March 31, 2019, WAL has the following significant wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

The Bank has the following significant wholly-owned subsidiaries: WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; WA PWI, which holds certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; and BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities.

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 reported in prior periods may have been reclassified in the Consolidated Financial Statements 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 months ended March 31, 2019 and 2018 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, 2018.

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.

Investment securities

Investment securities include debt securities and equity securities. Debt securities may be classified as HTM, AFS, or measured at fair value. 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 an HTM 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 securities are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS debt securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS debt 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 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 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

WAB is 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 Bank 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, adjusted for net deferred fees and costs, purchase accounting fair value adjustments, and an allowance for credit losses. In addition, the book values of loans subject to a fair value hedge are adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk.

The Company may also acquire loans through a business combination. These acquired loans are recorded at estimated fair value on the date of purchase, which is comprised of unpaid principal adjusted for estimated credit losses and interest rate fair value adjustments. Loans are evaluated individually at the acquisition date 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 purchased loans that are not deemed impaired at the acquisition date, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 3. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

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 a 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 a 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: 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.

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. 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 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 general allowance covers all non-impaired loans and incorporates several quantitative and qualitative factors, which are used for all of the Company's portfolio segments. Quantitative factors include company-specific, ten-year historical net charge-offs stratified by loans with similar characteristics. Qualitative factors include: 1) levels of and trends in delinquencies and impaired loans; 2) levels of and trends in charge-offs and recoveries; 3) trends in volume and terms of loans; 4) changes in underwriting standards or lending policies; 5) experience, ability, depth of lending staff; 6) national and local economic trends and conditions; 7) changes in credit concentrations; 8) out-of-market exposures; 9) changes in quality of loan review system; and 10) changes in the value of underlying collateral.

Due to the credit concentration of the Company's loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Arizona, Nevada, 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 the Bank 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.

Leases

At inception, contracts are evaluated to determine whether the contract constitutes a lease agreement. For contracts that are determined to be an operating lease, a corresponding ROU asset and operating lease liability are recorded in separate line items on the consolidated balance sheets. A ROU asset represents the Company’s right to use an underlying asset during the lease term and a lease liability represents the Company’s commitment to make contractually obligated lease payments. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease and are based on the present value of lease payments over the lease term. The measurement of the operating lease ROU asset includes any lease payments made and is reduced by lease incentives that are paid or are payable to the Company. Variable lease payments that depend on an index or rate such as the Consumer Price Index are included in lease payments based on the rate in effect at the commencement date of the lease. Lease payments are recognized on a straight-line basis as part of occupancy expense over the lease term.

As the rate implicit in the lease is not readily determinable, the incremental collateralized borrowing rate is used to determine the present value of lease payments. This rate gives consideration to the applicable FHLB collateralized borrowing rates and is based on the information available at the commencement date. The Company has elected to apply the short-term lease measurement and recognition exemption to leases with an initial term of 12 months or less; therefore, these leases are not recorded on the Company’s consolidated balance sheet, but rather, lease expense is recognized over the lease term on a straight-line basis. The Company’s lease agreements may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain that the options will be exercised.

In addition to the package of practical expedients, the Company also elected the practical expedient that allows lessees to make an accounting policy election to not separate non-lease components from the associated lease component, and instead account for them all together as part of the applicable lease component. This practical expedient can be elected separately for each underlying class of asset. The majority of the Company’s non-lease components such as common area maintenance, parking, and taxes are variable, and are expensed as incurred. Variable payment amounts are determined in arrears by the landlord depending on actual costs incurred. See “Note 4. Leases” of these Notes to Unaudited Consolidated Financial Statements for further disclosures required under the new standard.

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.

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price over the fair value of the identifiable net assets acquired in accordance with applicable guidance. 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. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. If the qualitative assessment indicates potential impairment, a quantitative impairment test is necessary. If, based on the quantitative test, a reporting unit's carrying amount exceeds its fair value, a goodwill impairment charge for this difference is recorded to current period earnings as non-interest expense.

The Company’s intangible assets consist primarily of core deposit intangible assets that are amortized over periods ranging from 5 to 10 years. The Company considers the remaining useful lives of its core deposit intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its core deposit intangibles during the three months ended March 31, 2019 or 2018.

Treasury shares

The Company separately presents treasury shares, which represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. Treasury shares are carried at cost.

Common Stock Repurchases

On December 11, 2018, the Company adopted its common stock repurchase program, pursuant to which the Company is authorized to repurchase up to $250 million of its shares of common stock. All shares repurchased under the plan are retired upon settlement. The Company has elected to allocate the excess of the repurchase price over the par value of its common stock between additional paid-in capital and retained earnings. The allocation of the excess repurchase price to additional paid-in capital is limited to the amount of additional paid-in capital that was recorded at the time that the shares were initially issued, which is calculated on a last-in, first-out basis. 

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to the fair value of certain fixed-rate financial instruments (fair value 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. 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.

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. Changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value 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 after the derivative contract is executed. At inception, the Company performs a quantitative assessment to determine whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in the fair value of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. After the initial quantitative assessment is performed, on a quarterly basis, the Company performs a qualitative hedge effectiveness assessment. This assessment takes into consideration any adverse developments related to the counterparty's risk of default and any negative events or circumstances that affect the factors that originally enabled the Company to assess that it could reasonably support, qualitatively, an expectation that the hedging relationship was and will continue to be highly effective. 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 the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and 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 the host contract is measured at fair value, with changes in fair value reported in current earnings, or 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.

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.

The Company also has off-balance sheet arrangements related to its derivative instruments. Derivative instruments are recognized in the Consolidated Financial Statements at fair value and their notional values are carried off-balance sheet. See "Note 10. Derivatives and Hedging Activities" of these Notes to Unaudited Consolidated Financial Statements for further discussion.

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. Changes to estimated fair values from a business combination are recognized as an adjustment to goodwill during the measurement period and are recognized in the proper reporting period in which the adjustment amounts are determined. 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.

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 may purchase the asset or assume 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 March 31, 2019 and 2018. The estimated fair value amounts for March 31, 2019 and 2018 have been measured as of period-end, and have not been re-evaluated 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, cash equivalents, and restricted cash

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, exchange-listed preferred stock, and certain corporate debt securities are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of debt 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.

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 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 and customer repurchase agreements

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 and customer repurchase agreements have been categorized as Level 2 in the fair value hierarchy due to their short durations.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued based on a discounted cash flow model which uses as inputs Treasury Bond rates and the 'BB' rated financial index. 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.

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 is considered, 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 the related tax liability line with other liabilities in the Consolidated Balance Sheet. See "Note 12. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements for further discussion on income taxes.

Non-interest income

Non-interest income includes service charges and fees, income from equity investments, card income, foreign currency income, income from bank owned life insurance, lending related income, net gain or loss on sales of investment securities, net unrealized gains or losses on assets measured at fair value, and other income. Service charges and fees consist of fees earned from performance of account analysis, general account services, and other deposit account services. These fees are recognized as the related services are provided in accordance with ASC 606, Revenue from Contracts with Customers. Income from equity investments includes gains on equity warrant assets, SBIC equity income, and success fees. Card income includes fees earned from customer use of debit and credit cards, interchange income from merchants, and international charges. Card income is generally within the scope of ASC 310, Receivables; however, certain processing transactions for merchants, such as interchange fees, are within the scope of ASC 606. Beginning on October 1, 2018, interchange fees are being recorded net of customer rewards earned, which is more in line with current industry practice. Foreign currency income represents fees earned on the differential between purchases and sales of foreign currency on behalf of the Company’s clients. Income from bank owned life insurance is accounted for in accordance with ASC 325, Investments - Other. Lending related income includes fees earned from gains or losses on the sale of loans, SBA income, and letter of credit fees. Gains and losses on the sale of loans and SBA income are recognized pursuant to ASC 860, Transfers and Servicing. Net unrealized gains or losses on assets measured at fair value represent fair value changes in equity securities and are accounted for in accordance with ASC 321, Investments - Equity Securities. Fees related to standby letters of credit are accounted for in accordance with ASC 440, Commitments. Other income includes operating lease income, which is recognized on a straight-line basis over the lease term in accordance with ASC 840, Leases. Net gain or loss on sales / valuations of repossessed and other assets is presented as a component of non-interest expense, but may also be presented as a component of non-interest income in the event that a net gain is recognized. Net gain or loss on sales of repossessed and other assets are accounted for in accordance with ASC 610, Other Income - Gains and Losses from the Derecognition of Nonfinancial Assets. See "Note 16. Revenue from Contracts with Customers" of these Notes to Unaudited Consolidated Financial Statements for further details related to the nature and timing of revenue recognition for non-interest income revenue streams within the scope of the new standard.

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Investment Securities

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Investment Securities

d fair values of investment securities at March 31, 2019 and December 31, 2018 are summarized as follows:

	March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	310,865	$	20,218	$	—		$	331,083
Available-for-sale debt securities
CDO	$	50	$	14,976	$	—		$	15,026
Commercial MBS issued by GSEs	104,227		104		(5,232		)	99,099
Corporate debt securities	105,026		116		(8,100		)	97,042
Private label residential MBS	946,757		2,861		(14,271		)	935,347
Residential MBS issued by GSEs	1,509,590		2,408		(19,762		)	1,492,236
Tax-exempt	526,899		11,666		(1,575		)	536,990
Trust preferred securities	32,000		—		(3,383		)	28,617
U.S. government sponsored agency securities	40,000		—		(1,099		)	38,901
U.S. treasury securities	997		—		(8		)	989
Total AFS debt securities	$	3,265,546	$	32,131	$	(53,430	)	$	3,244,247
Equity securities
CRA investments	$	52,361	$	—	$	(747	)	$	51,614
Preferred stock	65,913		954		(476		)	66,391
Total equity securities	$	118,274	$	954	$	(1,223	)	$	118,005

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	302,905	$	3,163	$	(7,420	)	$	298,648
Available-for-sale debt securities
CDO	$	50	$	15,277	$	—		$	15,327
Commercial MBS issued by GSEs	106,385		82		(6,361		)	100,106
Corporate debt securities	105,029		—		(5,649		)	99,380
Private label residential MBS	948,161		945		(24,512		)	924,594
Residential MBS issued by GSEs	1,564,181		1,415		(35,472		)	1,530,124
Tax-exempt	542,086		4,335		(7,753		)	538,668
Trust preferred securities	32,000		—		(3,383		)	28,617
U.S. government sponsored agency securities	40,000		—		(1,812		)	38,188
U.S. treasury securities	1,996		—		(12		)	1,984
Total AFS debt securities	$	3,339,888	$	22,054	$	(84,954	)	$	3,276,988
Equity securities
CRA investments	$	52,210	$	—	$	(1,068	)	$	51,142
Preferred stock	65,954		148		(2,183		)	63,919
Total equity securities	$	118,164	$	148	$	(3,251	)	$	115,061

The Company conducts an OTTI analysis on a quarterly basis. The initial indication of OTTI 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 debt securities, for the purpose of an OTTI analysis, the Company also considers the cause of the price decline (general level of interest rates, credit spreads, and industry and issuer-specific factors), whether downgrades by bond rating agencies have occurred, 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.

At March 31, 2019 and December 31, 2018, the Company’s unrealized losses relate primarily to market interest rate increases since the securities' original purchase date. The total number of AFS securities in an unrealized loss position at March 31, 2019 is 230, compared to 373 at December 31, 2018. 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 are no impairment charges for the three months ended March 31, 2019 and 2018. The Company does not consider any securities to be other-than-temporarily impaired as of March 31, 2019 and December 31, 2018. No assurance can be made that OTTI will not occur in future periods.

Information pertaining to securities with gross unrealized losses at March 31, 2019 and December 31, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	March 31, 2019
	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 debt securities
Commercial MBS issued by GSEs	$	—	$	—	$	5,232	$	97,264	$	5,232	$	97,264
Corporate debt securities	—		—		8,100		91,900		8,100		91,900
Private label residential MBS	—		—		14,271		703,525		14,271		703,525
Residential MBS issued by GSEs	2		265		19,760		1,184,558		19,762		1,184,823
Tax-exempt	—		—		1,575		80,676		1,575		80,676
Trust preferred securities	—		—		3,383		28,617		3,383		28,617
U.S. government sponsored agency securities	—		—		1,099		33,901		1,099		33,901
U.S. treasury securities	—		—		8		989		8		989
Total AFS securities	$	2	$	265	$	53,428	$	2,221,430	$	53,430	$	2,221,695

	December 31, 2018
	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)
Held-to-maturity debt securities
Tax-exempt	$	3,868	$	91,095	$	3,552	$	69,991	$	7,420	$	161,086
Available-for-sale debt securities
Commercial MBS issued by GSEs	$	—	$	—	$	6,361	$	98,275	$	6,361	$	98,275
Corporate debt securities	16		5,013		5,633		94,367		5,649		99,380
Private label residential MBS	5,173		217,982		19,339		537,316		24,512		755,298
Residential MBS issued by GSEs	1,363		141,493		34,109		1,215,490		35,472		1,356,983
Tax-exempt	3,562		209,767		4,191		72,382		7,753		282,149
Trust preferred securities	—		—		3,383		28,617		3,383		28,617
U.S. government sponsored agency securities	—		—		1,812		38,188		1,812		38,188
U.S. treasury securities	—		—		12		1,984		12		1,984
Total AFS securities	$	10,114	$	574,255	$	74,840	$	2,086,619	$	84,954	$	2,660,874

The amortized cost and fair value of securities as of March 31, 2019, 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. 

	March 31, 2019
	Amortized Cost		Estimated Fair Value
	(in thousands)
Held-to-maturity
Due in one year or less	$	10,100	$	10,147
After five years through ten years	14,386		14,984
After ten years	286,379		305,952
Total HTM securities	$	310,865	$	331,083
Available-for-sale
Due in one year or less	$	2,296	$	2,313
After one year through five years	12,036		12,206
After five years through ten years	211,149		203,258
After ten years	479,491		499,788
Mortgage-backed securities	2,560,574		2,526,682
Total AFS securities	$	3,265,546	$	3,244,247

The following tables summarize the carrying amount of the Company’s investment ratings position as of March 31, 2019 and December 31, 2018: 

	March 31, 2019
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	310,865	$	310,865
Available-for-sale debt securities
CDO	$	—	$	—	$	—	$	—	$	—	$	15,026	$	—	$	15,026
Commercial MBS issued by GSEs	—		99,099		—		—		—		—		—		99,099
Corporate debt securities	—		—		—		64,300		32,742		—		—		97,042
Private label residential MBS	911,689		—		21,079		297		898		1,384		—		935,347
Residential MBS issued by GSEs	—		1,492,236		—		—		—		—		—		1,492,236
Tax-exempt	68,227		8,875		294,830		163,391		—		—		1,667		536,990
Trust preferred securities	—		—		—		—		28,617		—		—		28,617
U.S. government sponsored agency securities	—		38,901		—		—		—		—		—		38,901
U.S. treasury securities	—		989		—		—		—		—		—		989
Total AFS securities	$	979,916	$	1,640,100	$	315,909	$	227,988	$	62,257	$	16,410	$	1,667	$	3,244,247
Equity securities
CRA investments	$	—	$	25,375	$	—	$	—	$	—	$	—	$	26,239	$	51,614
Preferred stock	—		—		—		—		47,931		3,925		14,535		66,391
Total equity securities	$	—	$	25,375	$	—	$	—	$	47,931	$	3,925	$	40,774	$	118,005

(1)Where ratings differ, the Company uses an average of the available ratings by major credit agencies.

	December 31, 2018
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	302,905	$	302,905
Available-for-sale debt securities
CDO	$	—	$	—	$	—	$	—	$	—	$	15,327	$	—	$	15,327
Commercial MBS issued by GSEs	—		100,106		—		—		—		—		—		100,106
Corporate debt securities	—		—		—		66,515		32,865		—		—		99,380
Private label residential MBS	887,520		—		34,342		343		947		1,442		—		924,594
Residential MBS issued by GSEs	—		1,530,124		—		—		—		—		—		1,530,124
Tax-exempt	66,160		12,146		306,409		152,330		—		—		1,623		538,668
Trust preferred securities	—		—		—		—		28,617		—		—		28,617
U.S. government sponsored agency securities	—		38,188		—		—		—		—		—		38,188
U.S. treasury securities	—		1,984		—		—		—		—		—		1,984
Total AFS securities	$	953,680	$	1,682,548	$	340,751	$	219,188	$	62,429	$	16,769	$	1,623	$	3,276,988
Equity securities
CRA investments	$	—	$	25,375	$	—	$	—	$	—	$	—	$	25,767	$	51,142
Preferred stock	—		—		—		—		45,771		3,693		14,455		63,919
Total equity securities	$	—	$	25,375	$	—	$	—	$	45,771	$	3,693	$	40,222	$	115,061

(1) Where ratings differ, the Company uses an average of the available ratings by major credit agencies.

Securities with carrying amounts of approximately $940.0 million and $788.4 million at March 31, 2019 and December 31, 2018, respectively, were pledged for various purposes as required or permitted by law.

There were no gains and losses on sales of investment securities during the three months ended March 31, 2019 and March 31, 2018.

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Loans, Leases and Allowance for Credit Losses

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Loans, Leases and Allowance for Credit Losses

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

	March 31, 2019			December 31, 2018
	(in thousands)
Commercial and industrial	$	7,723,695		$	7,762,642
Commercial real estate - non-owner occupied	4,304,261			4,213,428
Commercial real estate - owner occupied	2,285,340			2,325,380
Construction and land development	2,283,527			2,134,753
Residential real estate	1,461,561			1,204,355
Consumer	58,364			70,071
Loans, net of deferred loan fees and costs	18,116,748			17,710,629
Allowance for credit losses	(154,987		)	(152,717		)
Total loans HFI	$	17,961,761		$	17,557,912

Net deferred loan fees and costs as of March 31, 2019 and December 31, 2018 total $34.8 million and $36.3 million, respectively, which is a reduction in the carrying value of loans. Net unamortized purchase discounts on secondary market loan purchases total $8.2 million and $2.0 million as of March 31, 2019 and December 31, 2018, respectively. Total loans held for investment are also net of interest rate and credit marks on acquired loans, which are a net reduction in the carrying value of loans. Interest rate marks were $6.1 million and $7.1 million as of March 31, 2019 and December 31, 2018, respectively. Credit marks were $13.1 million and $14.6 million as of March 31, 2019 and December 31, 2018, respectively.

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

	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 Days Past Due		Total Past Due		Total
	(in thousands)
Commercial and industrial	$	7,711,923	$	193	$	10,638	$	941	$	11,772	$	7,723,695
Commercial real estate
Owner occupied	2,281,389		2,630		1,321		—		3,951		2,285,340
Non-owner occupied	4,143,704		984		—		—		984		4,144,688
Multi-family	159,573		—		—		—		—		159,573
Construction and land development
Construction	1,497,960		—		—		—		—		1,497,960
Land	784,146		945		—		476		1,421		785,567
Residential real estate	1,439,763		13,660		2,736		5,402		21,798		1,461,561
Consumer	58,248		—		—		116		116		58,364
Total loans	$	18,076,706	$	18,412	$	14,695	$	6,935	$	40,042	$	18,116,748

	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial and industrial	$	7,753,111	$	3,187	$	416	$	5,928	$	9,531	$	7,762,642
Commercial real estate
Owner occupied	2,320,321		4,441		—		618		5,059		2,325,380
Non-owner occupied	4,051,837		—		—		—		—		4,051,837
Multi-family	161,591		—		—		—		—		161,591
Construction and land development
Construction	1,382,664		—		—		—		—		1,382,664
Land	751,613		—		476		—		476		752,089
Residential real estate	1,182,933		9,316		4,010		8,096		21,422		1,204,355
Consumer	69,830		—		—		241		241		70,071
Total loans	$	17,673,900	$	16,944	$	4,902	$	14,883	$	36,729	$	17,710,629

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: 

	March 31, 2019								December 31, 2018
	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 and industrial	$	19,438	$	11,636	$	31,074	$	—	$	7,639	$	7,451	$	15,090	$	—
Commercial real estate
Owner occupied	420		—		420		—		—		—		—		594
Non-owner occupied	—		580		580		—		—		—		—		—
Multi-family	—		—		—		—		—		—		—		—
Construction and land development
Construction	3,307		—		3,307		—		—		476		476		—
Land	—		476		476		—		—		—		—		—
Residential real estate	1,168		6,746		7,914		—		552		11,387		11,939		—
Consumer	—		116		116		—		—		241		241		—
Total	$	24,333	$	19,554	$	43,887	$	—	$	8,191	$	19,555	$	27,746	$	594

The reduction in interest income associated with loans on non-accrual status was approximately $0.3 million and $0.6 million for the three months ended March 31, 2019 and 2018, 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 nine, 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 warrant 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: 

	March 31, 2019
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial and industrial	$	7,548,610	$	70,708	$	103,828	$	549	$	—	$	7,723,695
Commercial real estate
Owner occupied	2,206,311		23,044		55,985		—		—		2,285,340
Non-owner occupied	4,095,492		36,114		13,082		—		—		4,144,688
Multi-family	159,573		—		—		—		—		159,573
Construction and land development
Construction	1,470,710		4,088		23,162		—		—		1,497,960
Land	785,070		—		497		—		—		785,567
Residential real estate	1,452,919		365		8,277		—		—		1,461,561
Consumer	58,208		29		127		—		—		58,364
Total	$	17,776,893	$	134,348	$	204,958	$	549	$	—	$	18,116,748

	March 31, 2019
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	17,760,118	$	134,268	$	181,862	$	458	$	—	$	18,076,706
Past due 30 - 59 days	14,947		35		3,339		91		—		18,412
Past due 60 - 89 days	1,494		45		13,156		—		—		14,695
Past due 90 days or more	334		—		6,601		—		—		6,935
Total	$	17,776,893	$	134,348	$	204,958	$	549	$	—	$	18,116,748

	December 31, 2018
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial and industrial	$	7,574,506	$	61,202	$	126,356	$	578	$	—	$	7,762,642
Commercial real estate
Owner occupied	2,255,513		12,860		57,007		—		—		2,325,380
Non-owner occupied	4,030,350		12,982		8,505		—		—		4,051,837
Multi-family	161,591		—		—		—		—		161,591
Construction and land development
Construction	1,378,624		1,210		2,830		—		—		1,382,664
Land	751,012		—		1,077		—		—		752,089
Residential real estate	1,191,571		527		12,257		—		—		1,204,355
Consumer	69,755		75		241		—		—		70,071
Total	$	17,412,922	$	88,856	$	208,273	$	578	$	—	$	17,710,629

	December 31, 2018
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	17,400,616	$	87,264	$	186,020	$	—	$	—	$	17,673,900
Past due 30 - 59 days	11,255		1,580		4,109		—		—		16,944
Past due 60 - 89 days	719		12		3,767		404		—		4,902
Past due 90 days or more	332		—		14,377		174		—		14,883
Total	$	17,412,922	$	88,856	$	208,273	$	578	$	—	$	17,710,629

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

	March 31, 2019			December 31, 2018
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	5,244		$	986
Impaired loans without a specific valuation allowance under ASC 310 (2)	138,154			111,266
Total impaired loans	$	143,398		$	112,252
Valuation allowance related to impaired loans	$	(1,357	)	$	(681	)

(1) Includes no TDR loans as of each of the periods ended at March 31, 2019 and December 31, 2018.

(2) Includes TDR loans of $68.9 million and $44.5 million at March 31, 2019 and December 31, 2018, respectively.

The following table presents impaired loans by class: 

	March 31, 2019		December 31, 2018
	(in thousands)
Commercial and industrial	$	78,768	$	63,896
Commercial real estate
Owner occupied	8,185		6,530
Non-owner occupied	12,268		12,407
Multi-family	—		—
Construction and land development
Construction	20,329		—
Land	8,286		9,403
Residential real estate	15,417		19,744
Consumer	145		272
Total	$	143,398	$	112,252

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 March 31, 2019 and December 31, 2018.

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Average balance on impaired loans	$	126,613	$	93,081
Interest income recognized on impaired loans	1,493		873
Interest recognized on non-accrual loans, cash basis	309		438

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Commercial and industrial	$	67,144	$	36,849
Commercial real estate
Owner occupied	7,569		9,043
Non-owner occupied	12,311		18,925
Multi-family	—		—
Construction and land development
Construction	12,451		—
Land	8,632		10,281
Residential real estate	18,278		17,799
Consumer	228		184
Total	$	126,613	$	93,081

The average investment in TDR loans was $51.6 million and $48.3 million for the three months ended March 31, 2019 and 2018, respectively.

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Commercial and industrial	$	769	$	250
Commercial real estate
Owner occupied	123		127
Non-owner occupied	187		262
Multi-family	—		—
Construction and land development
Construction	180		—
Land	129		130
Residential real estate	105		104
Consumer	—		—
Total	$	1,493	$	873

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

The following table summarizes nonperforming assets: 

	March 31, 2019		December 31, 2018
	(in thousands)
Non-accrual loans (1)	$	43,887	$	27,746
Loans past due 90 days or more on accrual status	—		594
Accruing troubled debt restructured loans	52,488		36,458
Total nonperforming loans	96,375		64,798
Other assets acquired through foreclosure, net	17,707		17,924
Total nonperforming assets	$	114,082	$	82,722

(1) Includes non-accrual TDR loans of $16.4 million and $8.0 million at March 31, 2019 and December 31, 2018, respectively.

Loans Acquired with Deteriorated Credit Quality

Changes in the accretable yield for loans acquired with deteriorated credit quality are as follows:

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Balance, at beginning of period	$	3,768		$	9,324
Reclassifications from non-accretable to accretable yield (1)	—			683
Accretion to interest income	(161		)	(313		)
Reversal of fair value adjustments upon disposition of loans	(470		)	(1,586		)
Balance, at end of period	$	3,137		$	8,108

(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 March 31,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2019
Beginning Balance	$	22,513		$	34,829		$	11,276		$	83,118		$	981		$	152,717
Charge-offs	—			—			188			2,124			1			2,313
Recoveries	(55		)	(453		)	(93		)	(477		)	(5		)	(1,083		)
Provision	3,515			2,585			1,825			(4,217		)	(208		)	3,500
Ending balance	$	26,083		$	37,867		$	13,006		$	77,254		$	777		$	154,987
2018
Beginning Balance	$	19,511		$	31,495		$	5,478		$	82,793		$	773		$	140,050
Charge-offs	—			—			107			3,517			—			3,624
Recoveries	(1,388		)	(126		)	(250		)	(459		)	(10		)	(2,233		)
Provision	1,695			1,247			(102		)	3,143			17			6,000
Ending balance	$	22,594		$	32,868		$	5,519		$	82,878		$	800		$	144,659

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		Consumer		Total Loans
	(in thousands)
Loans as of March 31, 2019;
Recorded Investment
Impaired loans with an allowance recorded	$	—	$	—	$	590	$	1,347	$	3,307	$	—	$	5,244
Impaired loans with no allowance recorded	8,185		12,268		78,178		14,070		25,308		145		138,154
Total loans individually evaluated for impairment	8,185		12,268		78,768		15,417		28,615		145		143,398
Loans collectively evaluated for impairment	2,273,235		4,232,710		7,644,927		1,446,125		2,254,912		58,219		17,910,128
Loans acquired with deteriorated credit quality	3,920		59,283		—		19		—		—		63,222
Total recorded investment	$	2,285,340	$	4,304,261	$	7,723,695	$	1,461,561	$	2,283,527	$	58,364	$	18,116,748
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	—	$	—	$	1,463	$	1,347	$	3,307	$	—	$	6,117
Impaired loans with no allowance recorded	13,479		14,398		117,839		22,428		41,528		10,505		220,177
Total loans individually evaluated for impairment	13,479		14,398		119,302		23,775		44,835		10,505		226,294
Loans collectively evaluated for impairment	2,273,235		4,232,710		7,644,927		1,446,125		2,254,912		58,219		17,910,128
Loans acquired with deteriorated credit quality	5,257		74,453		4,347		72		—		—		84,129
Total unpaid principal balance	$	2,291,971	$	4,321,561	$	7,768,576	$	1,469,972	$	2,299,747	$	68,724	$	18,220,551
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	—	$	—	$	297	$	250	$	810	$	—	$	1,357
Impaired loans with no allowance recorded	—		—		—		—		—		—		—
Total loans individually evaluated for impairment	—		—		297		250		810		—		1,357
Loans collectively evaluated for impairment	14,746		23,020		76,949		12,756		25,273		777		153,521
Loans acquired with deteriorated credit quality	—		101		8		—		—		—		109
Total allowance for credit losses	$	14,746	$	23,121	$	77,254	$	13,006	$	26,083	$	777	$	154,987

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2018;
Recorded Investment
Impaired loans with an allowance recorded	$	—	$	—	$	623	$	363	$	—	$	—	$	986
Impaired loans with no allowance recorded	6,530		12,407		63,273		19,381		9,403		272		111,266
Total loans individually evaluated for impairment	6,530		12,407		63,896		19,744		9,403		272		112,252
Loans collectively evaluated for impairment	2,314,871		4,121,464		7,698,746		1,184,592		2,125,350		69,799		17,514,822
Loans acquired with deteriorated credit quality	3,979		79,557		—		19		—		—		83,555
Total recorded investment	$	2,325,380	$	4,213,428	$	7,762,642	$	1,204,355	$	2,134,753	$	70,071	$	17,710,629
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	—	$	—	$	1,482	$	363	$	—	$	—	$	1,845
Impaired loans with no allowance recorded	11,852		18,155		103,992		27,979		25,624		10,632		198,234
Total loans individually evaluated for impairment	11,852		18,155		105,474		28,342		25,624		10,632		200,079
Loans collectively evaluated for impairment	2,314,871		4,121,464		7,698,746		1,184,592		2,125,350		69,799		17,514,822
Loans acquired with deteriorated credit quality	5,315		95,680		4,352		72		—		—		105,419
Total unpaid principal balance	$	2,332,038	$	4,235,299	$	7,808,572	$	1,213,006	$	2,150,974	$	80,431	$	17,820,320
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	—	$	—	$	621	$	60	$	—	$	—	$	681
Impaired loans with no allowance recorded	—		—		—		—		—		—		—
Total loans individually evaluated for impairment	—		—		621		60		—		—		681
Loans collectively evaluated for impairment	14,286		20,456		82,488		11,216		22,513		981		151,940
Loans acquired with deteriorated credit quality	—		87		9		—		—		—		96
Total allowance for credit losses	$	14,286	$	20,543	$	83,118	$	11,276	$	22,513	$	981	$	152,717

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.

During the three months ended March 31, 2019, the Company had two new TDR loans with a recorded investment of $27.1 million and five new TDR loans during the three months ended March 31, 2018 with a recorded investment of $15.0 million. No principal amounts were forgiven and there were no waived fees or other expenses resulting from these TDRs.

During the three months ended March 31, 2019 and 2018, there were no TDR loans for which there was a payment default.

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 March 31, 2019 and December 31, 2018, commitments outstanding on TDR loans totaled $2.1 million and $1.5 million, respectively.

Loan Purchases and Sales

For the three months ended March 31, 2019 and 2018, secondary market loan purchases totaled $530.5 million and $141.5 million, respectively. For 2019, these purchased loans consisted of $312.5 million of residential real estate loans, $188.0 million of commercial and industrial loans, and $30.0 million of CRE, non-owner occupied loans. For 2018, these purchased loans consisted of $118.3 million of commercial and industrial loans and $23.2 million of residential real estate loans.

During the three months ended March 31, 2019, the Company sold commercial and industrial loans with carrying value of $15.5 million and recognized a net loss of $0.4 million. During the three months ended March 31, 2018, the Company sold loans which primarily consisted of commercial and industrial loans with a carrying value of $31.0 million and recognized a net gain of $0.7 million.

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Leases (Notes)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lessee, Operating Leases [Text Block]

4. LEASES

Adoption of ASU 2016-02, Leases

On January 1, 2019, the Company adopted the amendments to ASC 842, Leases, which requires lessees to recognize lease assets and liabilities arising from operating leases on the balance sheet. The Company adopted the new lease guidance using the modified retrospective approach and elected the transition option issued under ASU 2018-11, Leases (Topic 842) Targeted Improvements, allowing entities to continue to apply the legacy guidance in ASC 840, Leases, to prior periods, including disclosure requirements. Accordingly, prior period financial results and disclosures have not been adjusted.

The Company has operating leases under which it leases its branch offices, corporate headquarters, other offices, and data facility centers. Upon adoption of the new lease guidance, on January 1, 2019, the Company recorded a ROU asset and corresponding lease liability of $42.5 million and $46.1 million, respectively, on the consolidated balance sheet. As of March 31, 2019, the Company's operating lease ROU asset and operating lease liability totaled $72.8 million and $77.8 million, respectively. The increase in the operating lease ROU asset and the operating lease liability from the adoption date is due to execution of a major office lease extension subsequent to the adoption date. A weighted average discount rate of 3.06% was used in the measurement of the ROU asset and lease liability as of March 31, 2019.

The Company's leases have remaining lease terms between one to twelve years, with a weighted average lease term of 9.03 years at March 31, 2019. Some leases include multiple five-year renewal options. The Company’s decision to exercise these renewal options is based on an assessment of its current business needs and market factors at the time of the renewal. Currently, the Company has no leases for which the option to renew is reasonably certain and therefore, options to renew were not factored into the calculation of its ROU asset and lease liability as of March 31, 2019.

The following is a schedule of the Company's operating lease liabilities by contractual maturity as of March 31, 2019:

	(in thousands)
2019	$	9,099
2020	11,200
2021	9,186
2022	7,992
2023	8,002
Thereafter	45,503
Total lease payments	$	90,982
Less: imputed interest	13,232
Total present value of lease liabilities	$	77,750

The Company also has additional operating leases, primarily related to its branch offices and corporate headquarters, that have not yet commenced as of March 31, 2019. The aggregate future commitment related to these additional leases totals $5.0 million. These operating leases will commence in fiscal year 2019 and have lease terms between six to twelve years.

Total operating lease costs of $3.3 million and other lease costs of $1.1 million, which include common area maintenance, parking, and taxes during the three months ended March 31, 2019 were included as part of occupancy expense. Short-term lease costs were not material during the three months ended March 31, 2019. For the three months ended March 31, 2018, rent expense associated with the Company's operating leases totaled $2.5 million.

The below table shows the supplemental cash flow information related to the Company's operating leases for the three months ended March 31, 2019:

	(in thousands)
Cash paid for amounts included in the measurement of operating lease liabilities	$	3,039
Right-of-use assets obtained in exchange for new operating lease liabilities	32,905

Lease Obligations as of December 31, 2018

As previously disclosed in the Company's Annual Report on Form 10-K as of and for the year ended December 31, 2018, the following is a schedule of future minimum rental payments under its non-cancelable operating leases, expiring through 2030:

	(in thousands)
2019	$	11,370
2020	10,322
2021	7,418
2022	6,294
2023	6,070
Thereafter	15,417
Total future minimum rental payments	$	56,891

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Other Assets Acquired Through Foreclosure

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	19,979		$	(2,055	)	$	17,924
Charitable contribution	(232		)	114			(118		)
Valuation adjustments, net	—			(99		)	(99		)
Balance, end of period	$	19,747		$	(2,040	)	$	17,707
	2018
Balance, beginning of period	$	32,552		$	(4,012	)	$	28,540
Transfers to other assets acquired through foreclosure, net	5,744			—			5,744
Proceeds from sale of other real estate owned and repossessed assets, net	(5,294		)	9			(5,285		)
Valuation adjustments, net	—			(47		)	(47		)
Gains (losses), net (1)	1,242			—			1,242
Balance, end of period	$	34,244		$	(4,050	)	$	30,194

(1) There were zero and $1.0 millioninnet gains related to initial transfers to other assets during the three months ended March 31, 2019 and 2018, respectively.

At March 31, 2019 and 2018, the majority of the Company’s repossessed assets consisted of properties located in Nevada. The Company held 10 properties at March 31, 2019, compared to 11 at December 31, 2018, and 18 at March 31, 2018.

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Other Borrowings

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Other Borrowings

The following table summarizes the Company’s borrowings as of March 31, 2019 and December 31, 2018: 

	March 31, 2019		December 31, 2018
	(in thousands)
Short-Term:
Federal funds purchased	$	—	$	256,000
FHLB advances	—		235,000
Total short-term borrowings	$	—	$	491,000

The Company maintains federal fund lines of credit totaling $955.0 million as of March 31, 2019, which have rates comparable to the federal funds effective rate plus 0.10% to 0.20%. As of March 31, 2019, there were no outstanding balances on the Company's lines of credit. As of December 31, 2018, outstanding balances on these federal fund lines of credit totaled $256.0 million.

The Company also 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 March 31, 2019, the Company had no FHLB overnight advances. At December 31, 2018, the Company had $235.0 million of FHLB overnight advances, with an interest rate of 2.56%.

Other short-term borrowing sources available to the Company include customer repurchase agreements, which have an average rate of 0.15%. At March 31, 2019 and December 31, 2018, customer repurchase agreements totaled $15.1 million and $22.4 million, respectively.

As of March 31, 2019 and December 31, 2018, the Company had additional available credit with the FHLB of approximately $2.97 billion and $2.52 billion, respectively, and with the FRB of approximately $1.32 billion and $1.31 billion, respectively.

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Qualifying Debt

3 Months Ended

Mar. 31, 2019

Qualifying Debt Disclosure [Abstract]

Qualifying Debt

Subordinated Debt

The Parent has $175.0 million of subordinated debentures, which were recorded net of issuance costs of $5.5 million, and mature July 1, 2056. Beginning on or after July 1, 2021, the Company may redeem the debentures, in whole or in part, at their principal amount plus any accrued and unpaid interest. The debentures have a fixed interest rate of 6.25% per annum.

WAB has $150.0 million of subordinated debt, which was recorded net of debt issuance costs of $1.8 million, and matures 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 on the Company's subordinated debt issuances, the Company entered into fair value interest rate hedges with receive fixed/pay variable swaps.

The carrying value of all subordinated debt issuances, which includes the fair value of the related hedges, totals $305.0 million and $299.4 million at March 31, 2019 and December 31, 2018, respectively.

Junior Subordinated Debt

The Company has formed or acquired through acquisition eight statutory business trusts, which exist for the exclusive purpose of issuing Cumulative Trust Preferred Securities.

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 Company did not make the FVO election for the junior subordinated debt acquired as part of the Bridge acquisition. Accordingly, the carrying value of these trusts does not reflect the current fair value of the debt and includes a fair market value adjustment established at acquisition that is being accreted over the remaining life of the trusts.

The carrying value of junior subordinated debt was $69.0 million and $61.1 million as of March 31, 2019 and December 31, 2018, respectively. The weighted average interest rate of all junior subordinated debt as of March 31, 2019 was 4.94%, which is three-month LIBOR plus the contractual spread of 2.34%, compared to a weighted average interest rate of 5.15% at December 31, 2018.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2019

Stockholders' Equity Note [Abstract]

Stockholder's Equity

Stock-Based Compensation

Restricted Stock Awards

Restricted stock awards granted to employees generally vest over a three-year period. Stock grants made to non-employee WAL directors in 2019 will be fully vested on July 1, 2019. The Company estimates the compensation expense for stock grants based upon the grant date fair value. Stock compensation expense is recognized on a straight-line basis over the requisite service period for the entire award. The aggregate grant date fair value for the restricted stock awards granted during the three months ended March 31, 2019 and 2018 was $20.7 million and $21.9 million, respectively. Stock compensation expense related to restricted stock awards and stock options granted to employees are included in Salaries and employee benefits in the Consolidated Income Statement. For restricted stock awards granted to WAL directors, the related stock compensation expense is included in Legal, professional, and directors' fees. For each of the three months ended March 31, 2019 and 2018, the Company recognized $4.3 million in stock-based compensation expense related to all restricted stock award grants.

In addition, the Company previously granted shares of restricted stock to certain members of executive management that had both performance and service conditions that affect vesting. There were no such grants made during the three months ended March 31, 2019 and 2018, however expense is still being recognized for the grants made in 2017 as they also have a three-year vesting period. For the three months ended March 31, 2019, the Company recognized $0.5 million in stock-based compensation expense related to these performance-based restricted stock grants, compared to $0.6 million for the three months ended March 31, 2018.

Performance Stock Units

The Company grants members of its executive management 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 months ended March 31, 2019, the Company recognized $1.7 million in stock-based compensation expense related to these performance stock units, compared to $1.6 million for the three months ended March 31, 2018.

The three-year performance period for the 2016 grant ended on December 31, 2018, 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, executive management members were entitled to the maximum award of 202,776 shares, which was paid out in the first quarter of 2019.

Common Stock Repurchase

On December 12, 2018, the Company announced that it had adopted a common stock repurchase plan, pursuant to which the Company is authorized to repurchase up to $250.0 million of its shares of common stock. During the three months ended March 31, 2019, the Company repurchased 940,915 shares of its common stock, representing approximately 1% of the Company's outstanding shares, pursuant to the repurchase plan. The shares were repurchased at a weighted average price of $40.30, for a total payment of $37.9 million.

Treasury Shares

Treasury share purchases represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. The Company purchased 173,007 treasury shares at a weighted average price of $45.66 per share and 180,867 treasury shares at a weighted average price of $59.02 per share during the three months ended March 31, 2019 and 2018, respectively.

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Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2019

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 March 31,
	Unrealized holding gains (losses) on AFS			Unrealized holding gains (losses) on SERP			Unrealized holding gains (losses) on junior subordinated debt			Impairment loss on securities		Total
	(in thousands)
Balance, December 31, 2018	$	(47,591	)	$	392		$	13,433		$	144	$	(33,622	)
Other comprehensive income (loss) before reclassifications	31,377			(18		)	(5,928		)	—		25,431
Amounts reclassified from AOCI	—			—			—			—		—
Net current-period other comprehensive income (loss)	31,377			(18		)	(5,928		)	—		25,431
Balance, March 31, 2019	$	(16,214	)	$	374		$	7,505		$	144	$	(8,191	)
Balance, December 31, 2017	$	(10,026	)	$	385		$	6,352		$	144	$	(3,145	)
Balance, January 1, 2018 (1)	(12,556		)	469			7,740			144		(4,203		)
Other comprehensive (loss) income before reclassifications	(38,914		)	(11		)	1,466			—		(37,459		)
Amounts reclassified from AOCI	—			—			—			—		—
Net current-period other comprehensive (loss) income	(38,914		)	(11		)	1,466			—		(37,459		)
Balance, March 31, 2018	$	(51,470	)	$	458		$	9,206		$	144	$	(41,662	)

(1) As adjusted for adoption of ASU 2016-01 and ASU 2018-02. The cumulative effect of adoption of this guidance at January 1, 2018 resulted in an increase to retained earnings of $1.1 million and a corresponding decrease to accumulated other comprehensive income.

During the three months ended March 31, 2019 and 2018, there were no amounts reclassified out of accumulated other comprehensive loss.

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Derivatives and Hedging

3 Months Ended

Mar. 31, 2019

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives and Hedging Activities

The Company is a party to various derivative instruments. 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 March 31, 2019, December 31, 2018, and March 31, 2018, the Company does not have any outstanding cash flow hedges.

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 has entered into pay fixed/receive variable interest rate swaps designated as fair value hedges of certain fixed rate loans. 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.

The Company has also entered into receive fixed/pay variable interest rate swaps, designated as fair value hedges on its fixed rate subordinated debt offerings. As a result, the Company is paying a floating rate of three-month LIBOR plus 3.16% and is receiving semi-annual fixed payments of 5.00% to match the payments on the $150.0 million subordinated debt. For the fair value hedge on the Parent's $175.0 million subordinated debentures issued on June 16, 2016, the Company is paying a floating rate of three-month LIBOR plus 3.25% and is receiving quarterly fixed payments of 6.25% to match the payments on the debt.

Derivatives Not Designated in Hedge Relationships

Management also enters into certain foreign exchange derivative contracts and back-to-back interest rate swaps which are not designated as accounting hedges. Foreign exchange derivative contracts include spot, forward, and forward window contracts. The purpose of these derivative contracts is to mitigate foreign currency risk on transactions entered into, or on behalf of customers. Contracts with customers, along with the related derivative trades that the Company places, are both remeasured at fair value, and are referred to as economic hedges since they economically offset the Company's exposure. The Company's back-to-back interest rate swaps are used to manage long-term interest rate risk.

As of March 31, 2019, derivatives not designated as hedging instruments were in a net asset position of $0.2 million, compared to a net asset position of $0.3 million at December 31, 2018 and March 31, 2018. For the three months ended March 31, 2019 and 2018, net changes in the fair value related to these derivative contracts totaled $1.2 million and $0.5 million, respectively, and are included as part of Foreign currency income in the Consolidated Income Statements.

As of March 31, 2019 and December 31, 2018, the following amounts are reflected in the Consolidated Balance Sheet related to cumulative basis adjustments for fair value hedges:

	March 31, 2019					December 31, 2018
	Carrying Value of Hedged Assets/(Liabilities)			Cumulative Fair Value Hedging Adjustment (1)		Carrying Value of Hedged Assets/(Liabilities)			Cumulative Fair Value Hedging Adjustment (1)
	(in thousands)
Loans - HFI, net of deferred loan fees and costs	$	656,346		$	33,123	$	650,428		$	23,039
Qualifying debt	(305,002		)	14,222		(299,401		)	19,691

(1) Included in the carrying value of the hedged assets/(liabilities).

For the Company's derivative instruments that are designated and qualify as a fair value hedge, the gain or loss on the derivative instrument as well as the offsetting loss or gain on the hedged item attributable to the hedged risk are recognized in current earnings in the same line item as the offsetting loss or gain on the related interest rate swaps. For loans, the gain or loss on the hedged item is included in interest income and for subordinated debt, the gain or loss on the hedged item is included in interest expense.

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 March 31, 2019, December 31, 2018, and March 31, 2018. 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:

	March 31, 2019						December 31, 2018						March 31, 2018
			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	$	961,493	$	987	$	48,332	$	965,705	$	2,162	$	44,892	$	989,379	$	3,533	$	42,789
Total	961,493		987		48,332		965,705		2,162		44,892		989,379		3,533		42,789
Netting adjustments (1)	—		987		987		—		2,162		2,162		—		3,493		3,493
Net derivatives in the balance sheet	$	961,493	$	—	$	47,345	$	965,705	$	—	$	42,730	$	989,379	$	40	$	39,296
Derivatives not designated as hedging instruments:
Foreign currency contracts	$	42,113	$	715	$	511	$	49,690	$	454	$	201	$	90,855	$	684	$	394
Interest rate swaps	2,348		12		12		2,378		27		27		36,840		1,170		1,170
Total	$	44,461	$	727	$	523	$	52,068	$	481	$	228	$	127,695	$	1,854	$	1,564

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

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 cash deposits or 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 $48.3 million at March 31, 2019, $44.9 million at December 31, 2018, and $40.1 million at March 31, 2018.

The following table summarizes the Company's largest exposure to an individual counterparty at the dates indicated:

	March 31, 2019		December 31, 2018		March 31, 2018
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	987	$	1,411	$	2,515
Collateral posted by this counterparty	—		—		—
Derivative liability with this counterparty	32,250		23,906		20,624
Collateral pledged to this counterparty	40,035		25,761		29,719
Net exposure after netting adjustments and collateral	$	—	$	—	$	—

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 may be required to 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 March 31, 2019, December 31, 2018, and March 31, 2018 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 $47.3 million, $42.7 million, and $39.3 million, respectively. As of March 31, 2019, the Company was in an over-collateralized net position of $14.2 million after considering $62.5 million of collateral held in the form of cash and securities. As of December 31, 2018 and March 31, 2018, the Company was in an over-collateralized position of $7.6 million and $12.1 million, respectively.

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Earnings per Share

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019		2018
	(in thousands, except per share amounts)
Weighted average shares - basic	104,033		104,530
Dilutive effect of stock awards	442		794
Weighted average shares - diluted	104,475		105,324
Net income	$	120,796	$	100,900
Earnings per share - basic	1.16		0.97
Earnings per share - diluted	1.16		0.96

The Company had no anti-dilutive stock options outstanding at each of the periods ended March 31, 2019 and 2018.

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Income Taxes

3 Months Ended

Mar. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

The effective tax rate was 17.45% and 17.10% for the three months ended March 31, 2019 and 2018, respectively. The increase in the effective tax rate from the three months ended March 31, 2018 is due primarily to an increase in pre-tax book income and a smaller benefit from the excess stock compensation deduction.

As of March 31, 2019, the net deferred tax asset was $22.3 million, a decrease of $9.7 million from December 31, 2018. This overall decrease in the net deferred tax asset was primarily the result of an increase in the fair market value of AFS securities.

Although realization is not assured, the Company believes that the realization of the recognized deferred tax asset of $22.3 million at March 31, 2019 is more-likely-than-not based on expectations as to future taxable income and based on available tax planning strategies that could be implemented if necessary to prevent a carryover from expiring.

At March 31, 2019 and December 31, 2018, the Company had a $2.4 million deferred tax valuation allowance related to net capital loss carryovers.

As of March 31, 2019, the Company’s gross federal NOL carryovers after current year-to-date utilization, all of which are subject to limitations under Section 382 of the IRC, totaled approximately $47.4 million for which an ending deferred tax asset of $5.8 million has been recorded, reflecting the expected benefit of these federal NOL carryovers remaining. The Company also has varying gross amounts of state NOL carryovers, with the most significant in Arizona. The ending gross Arizona NOL carryovers totaled approximately $5.0 million after current year-to-date utilization. A deferred tax asset of $0.3 million has been recorded to reflect the expected benefit of all state NOL carryovers remaining.

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 total $332.0 million and $342.4 million as of March 31, 2019 and December 31, 2018, respectively. Unfunded LIHTC obligations are included as part of other liabilities in the Consolidated Balance Sheets and total $147.3 million and $171.7 million as of March 31, 2019 and December 31, 2018, respectively. For the three months ended March 31, 2019 and 2018, $10.1 million and $8.1 million, respectively, of amortization related to LIHTC investments was recognized as a component of income tax expense.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2019

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 one year.

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

	March 31, 2019		December 31, 2018
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $864,740 at March 31, 2019 and $770,114 at December 31, 2018	$	8,197,452	$	7,556,741
Credit card commitments and financial guarantees	251,675		237,312
Standby letters of credit, including unsecured letters of credit of $16,336 at March 31, 2019 and $21,879 at December 31, 2018	262,320		390,161
Total	$	8,711,447	$	8,184,214

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 included in other liabilities as a separate loss contingency and are not included in the allowance for credit losses reported in "Note 3. Loans, Leases and Allowance for Credit Losses" of these Unaudited Consolidated Financial Statements. This loss contingency for unfunded loan commitments and letters of credit was $9.2 millionand $8.2 million as of March 31, 2019 and December 31, 2018, respectively. Changes to this liability are adjusted through other expense in the Consolidated Income Statement.

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 four broad categories: geography, industry, product, and collateral. The Company's loan portfolio includes significant credit exposure to the CRE market. As of each of the periods ended March 31, 2019 and December 31, 2018, CRE related loans accounted for approximately 49% of total loans. Substantially all of these loans are secured by first liens with an initial loan to value ratio of generally not more than 75%. Approximately 35% and 36% of these CRE loans, excluding construction and land loans, were owner-occupied at March 31, 2019 and December 31, 2018, 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.

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Fair Value Accounting

3 Months Ended

Mar. 31, 2019

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 results in the recognition of unrealized gains and losses on these items at each reporting date. These unrealized gains and losses are recognized as part of other comprehensive income rather than earnings. The Company did not elect FVO treatment for the junior subordinated debt assumed in the Bridge Capital Holdings acquisition.

For the three months ended March 31, 2019 and 2018, unrealized gains and losses from fair value changes on junior subordinated debt were as follows:

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Unrealized gains/(losses)	$	(7,862	)	$	1,944
Changes included in OCI, net of tax	(5,928		)	1,466

Fair value on a recurring basis

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

AFS securities: 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.

Equity securities: Preferred stock and CRA investments are reported at fair value utilizing Level 1 inputs.

Independent pricing service: The Company's independent pricing service provides pricing information on the majority of the Company's Level 1 and 2 AFS securities. For a small subset of securities, other pricing sources are used, including observed prices on publicly-traded securities and dealer quotes. 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 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, including other pricing services and safekeeping statements, and evaluates those with notable variances.  In instances where there are discrepancies in pricing from various sources and management expectations, management may manually price securities using currently observed market data to determine whether they can develop similar prices or may utilize bid information from broker dealers. Any remaining discrepancies between management’s review and the prices provided by the vendor are discussed with the vendor and/or the Company’s other valuation advisors.

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.

The fair value of assets and liabilities measured at fair value on a recurring basis was 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)
March 31, 2019
Assets:
Available-for-sale debt securities
CDO	$	—	$	15,026	$	—	$	15,026
Commercial MBS issued by GSEs	—		99,099		—		99,099
Corporate debt securities	5,142		91,900		—		97,042
Private label residential MBS	—		935,347		—		935,347
Residential MBS issued by GSEs	—		1,492,236		—		1,492,236
Tax-exempt	—		536,990		—		536,990
Trust preferred securities	—		28,617		—		28,617
U.S. government sponsored agency securities	—		38,901		—		38,901
U.S. treasury securities	—		989		—		989
Total AFS debt securities	$	5,142	$	3,239,105	$	—	$	3,244,247
Equity securities
CRA investments	$	51,614	$	—	$	—	$	51,614
Preferred stock	66,391		—		—		66,391
Total equity securities	$	118,005	$	—	$	—	$	118,005
Derivative assets (1)	$	—	$	1,714	$	—	$	1,714
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	56,546	$	56,546
Derivative liabilities (1)	—		48,855		—		48,855

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $33,123 and the net carrying value of subordinated debt is increased by $14,222 as of March 31, 2019 for the effective portion of the hedge, which relates to the fair value 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, 2018
Assets:
Available-for-sale debt securities
CDO	$	—	$	15,327	$	—	$	15,327
Commercial MBS issued by GSEs	—		100,106		—		100,106
Corporate debt securities	—		99,380		—		99,380
Private label residential MBS	—		924,594		—		924,594
Residential MBS issued by GSEs	—		1,530,124		—		1,530,124
Tax-exempt	—		538,668		—		538,668
Trust preferred securities	—		28,617		—		28,617
U.S. government sponsored agency securities	—		38,188		—		38,188
U.S. treasury securities	—		1,984		—		1,984
Total AFS debt securities	$	—	$	3,276,988	$	—	$	3,276,988
Equity securities
CRA investments	$	51,142	$	—	$	—	$	51,142
Preferred stock	63,919		—		—		63,919
Total equity securities	$	115,061	$	—	$	—	$	115,061
Derivative assets (1)	$	—	$	2,643	$	—	$	2,643
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	48,684	$	48,684
Derivative liabilities (1)	—		45,120		—		45,120

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $23,039 and the net carrying value of subordinated debt is decreased by $19,691 as of December 31, 2018 for the effective portion of the hedge, which relates to the fair value 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.

For the three months ended March 31, 2019 and 2018, the change in Level 3 liabilities measured at fair value on a recurring basis was as follows:

	Junior Subordinated Debt
	Three Months Ended March 31,
	2019			2018
	(in thousands)
Beginning balance	$	(48,684	)	$	(56,234	)
Change in fair value (1)	(7,862		)	1,944
Ending balance	$	(56,546	)	$	(54,290	)

(1) Unrealized gains/(losses) attributable to changes in the fair value of junior subordinated debt are recorded as part of OCI, net of tax, and totaled $(5.9) million and $1.5 million for three months ended March 31, 2019 and 2018, respectively.

For Level 3 liabilities measured at fair value on a recurring basis as of March 31, 2019 and December 31, 2018, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2019		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in thousands)
Junior subordinated debt	$	56,546	Discounted cash flow	Implied credit rating of the Company	6.65	%

	December 31, 2018		Valuation Technique	Significant Unobservable Inputs	Input Value
	(in thousands)
Junior subordinated debt	$	48,684	Discounted cash flow	Implied credit rating of the Company	7.82	%

The significant unobservable inputs used in the fair value measurement of the Company’s junior subordinated debt as of March 31, 2019 and December 31, 2018 was the implied credit risk for the Company, calculated as the difference between the 20-year 'BB' rated financial index over the corresponding swap index.

As of March 31, 2019, the Company estimates the discount rate at 6.65%, which represents an implied credit spread of 4.05% plus three-month LIBOR (2.60%). As of December 31, 2018, the Company estimated the discount rate at 7.82%, which was a 5.01% credit spread plus three-month LIBOR (2.81%).

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 March 31, 2019;
Impaired loans with specific valuation allowance	$	3,887	$	—	$	—	$	3,887
Impaired loans without specific valuation allowance (1)	122,723		—		—		122,723
Other assets acquired through foreclosure	17,707		—		—		17,707
As of December 31, 2018:
Impaired loans with specific valuation allowance	$	305	$	—	$	—	$	305
Impaired loans without specific valuation allowance (1)	91,821		—		—		91,821
Other assets acquired through foreclosure	17,924		—		—		17,924

(1) Net of loan balances with charge-offs of $15.4 million and $19.4 million as of March 31, 2019 and December 31, 2018, respectively.

For Level 3 assets measured at fair value on a nonrecurring basis as of March 31, 2019 and December 31, 2018, the significant unobservable inputs used in the fair value measurements were as follows:

	March 31, 2019		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in thousands)
Impaired loans	$	126,610	Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	4.0% to 7.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	17,707		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

	December 31, 2018		Valuation Technique(s)		Significant Unobservable Inputs	Range
	(in thousands)
Impaired loans	$	92,126	Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%
			Discounted cash flow method	Discount rate	Contractual loan rate	4.0% to 7.0%
				Scheduled cash collections	Probability of default	0% to 20.0%
				Proceeds from non-real estate collateral	Loss given default	0% to 70.0%
Other assets acquired through foreclosure	17,924		Collateral method	Third party appraisal	Costs to sell	4.0% to 10.0%

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 independent third-party appraisals or internally-developed discounted cash flow analyses. 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 addition, when adjustments are made to an appraised value to reflect various factors such as the age of the appraisal or known changes in the market or the collateral, such valuation inputs are considered unobservable and the fair value measurement is categorized as a Level 3 measurement. Internal discounted cash flow analyses are also utilized to estimate the fair value of impaired loans, which considers internally-developed, unobservable inputs such as discount rates, default rates, and loss severity.

Total Level 3 impaired loans had an estimated fair value of $126.6 million and $92.1 million at March 31, 2019 and December 31, 2018, respectively. Impaired loans with a specific valuation allowance had a gross estimated fair value of $5.2 million and $1.0 million at March 31, 2019 and December 31, 2018, respectively, which was reduced by a specific valuation allowance of $1.4 million and $0.7 million, 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.

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. The Company had $17.7 million and $17.9 million of such assets at March 31, 2019 and December 31, 2018, respectively.

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 months ended March 31, 2019 and 2018, the Company determined that no securities experienced credit losses.

There is no OTTI balance recognized in comprehensive income as of March 31, 2019 and 2018.

Fair Value of Financial Instruments

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

	March 31, 2019
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Federal funds sold	$	290,000	$	—	$	290,000	$	—	$	290,000
Investment securities:
HTM	310,865		—		331,083		—		331,083
AFS	3,244,247		5,142		3,239,105		—		3,244,247
Equity	118,005		118,005		—		—		118,005
Derivative assets	1,714		—		1,714		—		1,714
Loans, net	17,961,761		—		17,344,300		126,610		17,470,910
Accrued interest receivable	98,128		—		98,128		—		98,128
Financial liabilities:
Deposits	$	20,208,740	$	—	$	20,225,997	$	—	$	20,225,997
Customer repurchase agreements	15,141		—		15,141		—		15,141
Qualifying debt	373,996		—		332,988		67,730		400,718
Derivative liabilities	48,855		—		48,855		—		48,855
Accrued interest payable	15,853		—		15,853		—		15,853

	December 31, 2018
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
HTM	$	302,905	$	—	$	298,648	$	—	$	298,648
AFS	3,276,988		—		3,276,988		—		3,276,988
Equity securities	115,061		115,061		—		—		115,061
Derivative assets	2,643		—		2,643		—		2,643
Loans, net	17,557,912		—		16,857,852		92,126		16,949,978
Accrued interest receivable	101,275		—		101,275		—		101,275
Financial liabilities:
Deposits	$	19,177,447	$	—	$	19,188,216	$	—	$	19,188,216
Customer repurchase agreements	22,411		—		22,411		—		22,411
Other borrowings	491,000		—		491,000		—		491,000
Qualifying debt	360,458		—		323,572		57,924		381,496
Derivative liabilities	45,120		—		45,120		—		45,120
Accrued interest payable	20,463		—		20,463		—		20,463

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 the Company's 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.

WAB has an ALCO charged with managing interest rate risk within the BOD-approved limits. Limits are structured to preclude an interest rate risk profile that does not conform to both management and BOD risk tolerances without ALCO approval. There is also ALCO reporting at the Parent level for reviewing interest rate risk for the Company, which gets reported to the BOD and its Finance and Investment Committee.

Fair value of commitments

The estimated fair value of standby letters of credit outstanding at March 31, 2019 and December 31, 2018 is insignificant. Loan commitments on which the committed interest rates are less than the current market rate are also insignificant at March 31, 2019 and December 31, 2018.

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Segments

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Segments

The Company's reportable segments are aggregated based primarily on geographic location, services offered, and markets served. The Company's regional segments, which include Arizona, Nevada, Southern California, and Northern California, provide full service banking and related services to their respective markets. The operations from the regional segments correspond to the following banking divisions: ABA in Arizona, BON and FIB in Nevada, TPB in Southern California, and Bridge in Northern California.

The Company's NBL segments provide specialized banking services to niche markets. The Company's NBL reportable segments include HOA Services, Public & Nonprofit Finance, Technology & Innovation, HFF, and Other NBLs. These NBLs are managed centrally and are broader in geographic scope than the Company's other segments, though still predominately located within the Company's core market areas.

The Corporate & Other segment consists of corporate-related items, income and expense items not allocated to the Company's 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 or deficient 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.

The net income amount 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.

The following is a summary of operating segment information for the periods indicated:

				Regional Segments
Balance Sheet:	Consolidated Company			Arizona			Nevada			Southern California			Northern California
At March 31, 2019	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	4,525.0		$	2.3		$	9.1		$	2.0		$	1.9
Loans, net of deferred loan fees and costs	18,116.7			3,653.9			2,069.4			2,249.8			1,197.2
Less: allowance for credit losses	(155.0		)	(31.9		)	(18.3		)	(20.1		)	(9.4		)
Total loans	17,961.7			3,622.0			2,051.1			2,229.7			1,187.8
Other assets acquired through foreclosure, net	17.7			0.7			13.9			—			—
Goodwill and other intangible assets, net	298.8			—			23.2			—			155.3
Other assets	989.6			47.6			58.4			15.2			24.3
Total assets	$	23,792.8		$	3,672.6		$	2,155.7		$	2,246.9		$	1,369.3
Liabilities:
Deposits	$	20,208.7		$	5,319.9		$	4,006.8		$	2,793.8		$	2,008.7
Borrowings and qualifying debt	374.0			—			—			—			—
Other liabilities	489.5			11.6			12.0			0.5			13.4
Total liabilities	21,072.2			5,331.5			4,018.8			2,794.3			2,022.1
Allocated equity:	2,720.6			447.7			283.1			260.5			298.9
Total liabilities and stockholders' equity	$	23,792.8		$	5,779.2		$	4,301.9		$	3,054.8		$	2,321.0
Excess funds provided (used)	—			2,106.6			2,146.2			807.9			951.7

Income Statement:
Three Months Ended March 31, 2019	(in thousands)
Net interest income	$	247,336		$	55,226		$	39,096		$	30,477		$	23,033
Provision for (recovery of) credit losses	3,500			161			533			733			(719		)
Net interest income after provision for credit losses	243,836			55,065			38,563			29,744			23,752
Non-interest income	15,410			1,521			2,573			1,001			2,220
Non-interest expense	(112,914		)	(22,248		)	(15,781		)	(14,583		)	(13,490		)
Income (loss) before income taxes	146,332			34,338			25,355			16,162			12,482
Income tax expense (benefit)	25,536			8,584			5,325			4,525			3,495
Net income	$	120,796		$	25,754		$	20,030		$	11,637		$	8,987

	National Business Lines
Balance Sheet:	HOA Services			Public & Nonprofit Finance			Technology & Innovation			Hotel Franchise Finance			Other NBLs			Corporate & Other
At March 31, 2019
Assets:	(in millions)
Cash, cash equivalents, and investment securities	$	—		$	—		$	—		$	—		$	—		$	4,509.7
Loans, net of deferred loan fees and costs	209.4			1,561.7			1,057.3			1,564.9			4,549.0			4.1
Less: allowance for credit losses	(1.9		)	(14.8		)	(8.4		)	(9.5		)	(40.7		)	—
Total loans	207.5			1,546.9			1,048.9			1,555.4			4,508.3			4.1
Other assets acquired through foreclosure, net	—			—			—			—			—			3.1
Goodwill and other intangible assets, net	—			—			120.2			0.1			—			—
Other assets	0.9			12.5			6.4			7.7			58.8			757.8
Total assets	$	208.4		$	1,559.4		$	1,175.5		$	1,563.2		$	4,567.1		$	5,274.7
Liabilities:
Deposits	$	2,963.0		$	—		$	2,404.7		$	—		$	5.3		$	706.5
Borrowings and qualifying debt	—			—			—			—			—			374.0
Other liabilities	2.0			34.0			—			(0.3		)	60.9			355.4
Total liabilities	2,965.0			34.0			2,404.7			(0.3		)	66.2			1,435.9
Allocated equity:	77.7			126.0			253.3			130.3			374.3			468.8
Total liabilities and stockholders' equity	$	3,042.7		$	160.0		$	2,658.0		$	130.0		$	440.5		$	1,904.7
Excess funds provided (used)	2,834.3			(1,399.4		)	1,482.5			(1,433.2		)	(4,126.6		)	(3,370.0		)

Income Statement:
Three Months Ended March 31, 2019	(in thousands)
Net interest income	$	20,641		$	3,423		$	29,403		$	12,944		$	25,691		$	7,402
Provision for (recovery of) credit losses	(27		)	(41		)	(917		)	799			2,978			—
Net interest income after provision for credit losses	20,668			3,464			30,320			12,145			22,713			7,402
Non-interest income	96			—			3,362			—			657			3,980
Non-interest expense	(8,460		)	(1,907		)	(11,889		)	(2,398		)	(9,336		)	(12,822		)
Income (loss) before income taxes	12,304			1,557			21,793			9,747			14,034			(1,440		)
Income tax expense (benefit)	2,830			358			5,012			2,242			3,228			(10,063		)
Net income	$	9,474		$	1,199		$	16,781		$	7,505		$	10,806		$	8,623

				Regional Segments
	Consolidated Company			Arizona			Nevada			Southern California			Northern California
At December 31, 2018	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	4,259.7		$	2.5		$	10.9		$	2.5		$	3.0
Loans, net of deferred loan fees and costs	17,710.6			3,647.9			2,003.5			2,161.1			1,300.2
Less: allowance for credit losses	(152.7		)	(30.7		)	(18.7		)	(19.8		)	(10.7		)
Total loans	17,557.9			3,617.2			1,984.8			2,141.3			1,289.5
Other assets acquired through foreclosure, net	17.9			0.8			13.9			—			—
Goodwill and other intangible assets, net	299.2			—			23.2			—			155.5
Other assets	974.8			46.9			57.8			14.2			23.9
Total assets	$	23,109.5		$	3,667.4		$	2,090.6		$	2,158.0		$	1,471.9
Liabilities:
Deposits	$	19,177.4		$	5,090.2		$	3,996.4		$	2,347.5		$	1,839.1
Borrowings and qualifying debt	851.5			—			—			—			—
Other liabilities	466.9			10.4			14.5			4.5			12.2
Total liabilities	20,495.8			5,100.6			4,010.9			2,352.0			1,851.3
Allocated equity:	2,613.7			441.0			277.4			242.9			304.1
Total liabilities and stockholders' equity	$	23,109.5		$	5,541.6		$	4,288.3		$	2,594.9		$	2,155.4
Excess funds provided (used)	—			1,874.2			2,197.7			436.9			683.5

Income Statement:
Three Months Ended March 31, 2018	(in thousands)
Net interest income (expense)	$	214,220		$	54,555		$	36,690		$	27,802		$	22,255
Provision for (recovery of) credit losses	6,000			1,434			(1,723		)	729			1,548
Net interest income (expense) after provision for credit losses	208,220			53,121			38,413			27,073			20,707
Non-interest income	11,643			1,416			3,333			1,001			2,547
Non-interest expense	(98,149		)	(21,504		)	(14,084		)	(13,646		)	(12,503		)
Income (loss) before income taxes	121,714			33,033			27,662			14,428			10,751
Income tax expense (benefit)	20,814			8,321			5,903			4,135			3,098
Net income	$	100,900		$	24,712		$	21,759		$	10,293		$	7,653

	National Business Lines
	HOA Services			Public & Nonprofit Finance			Technology & Innovation			Hotel Franchise Finance			Other NBLs			Corporate & Other
At December 31, 2018
Assets:	(in millions)
Cash, cash equivalents, and investment securities	$	—		$	—		$	—		$	—		$	—		$	4,240.8
Loans, net of deferred loan fees and costs	210.0			1,547.5			1,200.9			1,479.9			4,154.9			4.7
Less: allowance for credit losses	(1.9		)	(14.2		)	(10.0		)	(8.5		)	(38.2		)	—
Total loans	208.1			1,533.3			1,190.9			1,471.4			4,116.7			4.7
Other assets acquired through foreclosure, net	—			—			—			—			—			3.2
Goodwill and other intangible assets, net	—			—			120.4			0.1			—			—
Other assets	0.9			20.1			6.3			7.2			37.1			760.4
Total assets	$	209.0		$	1,553.4		$	1,317.6		$	1,478.7		$	4,153.8		$	5,009.1
Liabilities:
Deposits	$	2,607.2		$	—		$	2,559.0		$	—		$	—		$	738.0
Borrowings and qualifying debt	—			—			—			—			—			851.5
Other liabilities	2.1			25.2			0.1			0.4			49.6			347.9
Total liabilities	2,609.3			25.2			2,559.1			0.4			49.6			1,937.4
Allocated equity:	70.7			123.9			268.7			122.3			340.0			422.7
Total liabilities and stockholders' equity	$	2,680.0		$	149.1		$	2,827.8		$	122.7		$	389.6		$	2,360.1
Excess funds provided (used)	2,471.0			(1,404.3		)	1,510.2			(1,356.0		)	(3,764.2		)	(2,649.0		)

Income Statement:
Three Months Ended March 31, 2018	(in thousands)
Net interest income (expense)	$	15,359		$	3,746		$	22,821		$	14,185		$	18,811		$	(2,004	)
Provision for (recovery of) credit losses	47			(207		)	1,651			1,236			1,285			—
Net interest income (expense) after provision for credit losses	15,312			3,953			21,170			12,949			17,526			(2,004		)
Non-interest income	150			—			3,051			13			224			(92		)
Non-interest expense	(7,803		)	(2,174		)	(9,833		)	(2,206		)	(5,662		)	(8,734		)
Income (loss) before income taxes	7,659			1,779			14,388			10,756			12,088			(10,830		)
Income tax expense (benefit)	1,761			409			3,309			2,474			2,780			(11,376		)
Net income	$	5,898		$	1,370		$	11,079		$	8,282		$	9,308		$	546

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Summary of Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2019

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, international banking, and online banking products and services through its wholly-owned banking subsidiary, WAB.

WAB operates the following full-service banking divisions: ABA, BON, FIB, Bridge, and TPB. The Company also serves business customers through a national platform of specialized financial services. In addition, the Company has two non-bank subsidiaries, LVSP, which holds and manages certain OREO properties, and a captive insurance company formed and licensed under the laws of the State of Arizona, CSI. CSI was established as part of the Company's overall enterprise risk management strategy.

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 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. Management's estimates and judgments are ongoing and are based on experience, current and expected future conditions, third-party evaluations and various other assumptions that management believes are reasonable under the circumstances. The results of these estimates form the basis for making judgments about the carrying values of assets and liabilities, as well as identifying and assessing the accounting treatment with respect to commitments and contingencies. Actual results may differ from those estimates and assumptions used in the Consolidated Financial Statements and related notes. Material estimates that are particularly susceptible to significant changes in the near term relate to the determination of the allowance for credit losses; certain assets and liabilities carried at fair value; and accounting for income taxes.

Principles of Consolidation

Principles of consolidation

As of March 31, 2019, WAL has the following significant wholly-owned subsidiaries: WAB, LVSP, and eight unconsolidated subsidiaries used as business trusts in connection with the issuance of trust-preferred securities.

The Bank has the following significant wholly-owned subsidiaries: WABT, which holds certain investment securities, municipal and nonprofit loans, and leases; WA PWI, which holds certain limited partnerships invested primarily in low income housing tax credits and small business investment corporations; and BW Real Estate, Inc., which operates as a real estate investment trust and holds certain of WAB's real estate loans and related securities.

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 reported in prior periods may have been reclassified in the Consolidated Financial Statements to conform to the current presentation. The reclassifications have no effect on net income or stockholders’ equity as previously reported.

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. Changes to estimated fair values from a business combination are recognized as an adjustment to goodwill during the measurement period and are recognized in the proper reporting period in which the adjustment amounts are determined. 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 include debt securities and equity securities. Debt securities may be classified as HTM, AFS, or measured at fair value. 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 an HTM 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 securities are reported as an asset in the Consolidated Balance Sheet at their estimated fair value. As the fair value of AFS debt securities changes, the changes are reported net of income tax as an element of OCI, except for other-than-temporarily-impaired securities. When AFS debt 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 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 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

WAB is 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 Bank 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, adjusted for net deferred fees and costs, purchase accounting fair value adjustments, and an allowance for credit losses. In addition, the book values of loans subject to a fair value hedge are adjusted for changes in value attributable to the effective portion of the hedged benchmark interest rate risk.

The Company may also acquire loans through a business combination. These acquired loans are recorded at estimated fair value on the date of purchase, which is comprised of unpaid principal adjusted for estimated credit losses and interest rate fair value adjustments. Loans are evaluated individually at the acquisition date 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 purchased loans that are not deemed impaired at the acquisition date, fair value adjustments attributable to both credit and interest rates are accreted (or amortized) over the contractual life of the individual loan. For additional information, see "Note 3. Loans, Leases and Allowance for Credit Losses" of these Notes to Unaudited Consolidated Financial Statements.

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 a 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 a 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: 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.

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. 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 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 general allowance covers all non-impaired loans and incorporates several quantitative and qualitative factors, which are used for all of the Company's portfolio segments. Quantitative factors include company-specific, ten-year historical net charge-offs stratified by loans with similar characteristics. Qualitative factors include: 1) levels of and trends in delinquencies and impaired loans; 2) levels of and trends in charge-offs and recoveries; 3) trends in volume and terms of loans; 4) changes in underwriting standards or lending policies; 5) experience, ability, depth of lending staff; 6) national and local economic trends and conditions; 7) changes in credit concentrations; 8) out-of-market exposures; 9) changes in quality of loan review system; and 10) changes in the value of underlying collateral.

Due to the credit concentration of the Company's loan portfolio in real estate secured loans, the value of collateral is heavily dependent on real estate values in Arizona, Nevada, 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 the Bank 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.

Lessee, Leases [Policy Text Block]

Leases

At inception, contracts are evaluated to determine whether the contract constitutes a lease agreement. For contracts that are determined to be an operating lease, a corresponding ROU asset and operating lease liability are recorded in separate line items on the consolidated balance sheets. A ROU asset represents the Company’s right to use an underlying asset during the lease term and a lease liability represents the Company’s commitment to make contractually obligated lease payments. Operating lease ROU assets and liabilities are recognized at the commencement date of the lease and are based on the present value of lease payments over the lease term. The measurement of the operating lease ROU asset includes any lease payments made and is reduced by lease incentives that are paid or are payable to the Company. Variable lease payments that depend on an index or rate such as the Consumer Price Index are included in lease payments based on the rate in effect at the commencement date of the lease. Lease payments are recognized on a straight-line basis as part of occupancy expense over the lease term.

As the rate implicit in the lease is not readily determinable, the incremental collateralized borrowing rate is used to determine the present value of lease payments. This rate gives consideration to the applicable FHLB collateralized borrowing rates and is based on the information available at the commencement date. The Company has elected to apply the short-term lease measurement and recognition exemption to leases with an initial term of 12 months or less; therefore, these leases are not recorded on the Company’s consolidated balance sheet, but rather, lease expense is recognized over the lease term on a straight-line basis. The Company’s lease agreements may include options to extend or terminate the lease. These options are included in the lease term when it is reasonably certain that the options will be exercised.

In addition to the package of practical expedients, the Company also elected the practical expedient that allows lessees to make an accounting policy election to not separate non-lease components from the associated lease component, and instead account for them all together as part of the applicable lease component. This practical expedient can be elected separately for each underlying class of asset. The majority of the Company’s non-lease components such as common area maintenance, parking, and taxes are variable, and are expensed as incurred. Variable payment amounts are determined in arrears by the landlord depending on actual costs incurred. See “Note 4. Leases” of these Notes to Unaudited Consolidated Financial Statements for further disclosures required under the new standard.

Goodwill and Other Intangible Assets

Goodwill and other intangible assets

The Company records as goodwill the excess of the purchase price over the fair value of the identifiable net assets acquired in accordance with applicable guidance. 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. The Company can first elect to assess, through qualitative factors, whether it is more likely than not that goodwill is impaired. If the qualitative assessment indicates potential impairment, a quantitative impairment test is necessary. If, based on the quantitative test, a reporting unit's carrying amount exceeds its fair value, a goodwill impairment charge for this difference is recorded to current period earnings as non-interest expense.

The Company’s intangible assets consist primarily of core deposit intangible assets that are amortized over periods ranging from 5 to 10 years. The Company considers the remaining useful lives of its core deposit intangible assets each reporting period, as required by ASC 350, Intangibles—Goodwill and Other, to determine whether events and circumstances warrant a revision to the remaining period of amortization. If the estimate of an intangible asset’s remaining useful life has changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company has not revised its estimates of the useful lives of its core deposit intangibles during the three months ended March 31, 2019 or 2018.

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.

Treasury Shares

Treasury shares

The Company separately presents treasury shares, which represent shares surrendered to the Company equal in value to the statutory payroll tax withholding obligations arising from the vesting of employee restricted stock awards. Treasury shares are carried at cost.

Derivative Financial Instruments

Derivative financial instruments

The Company uses interest-rate swaps to mitigate interest-rate risk associated with changes to the fair value of certain fixed-rate financial instruments (fair value 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. 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.

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. Changes in the fair value of derivatives not considered to be highly effective in hedging the change in fair value 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 after the derivative contract is executed. At inception, the Company performs a quantitative assessment to determine whether the derivatives used in hedging transactions are highly effective (as defined in the guidance) in offsetting changes in the fair value of the hedged item. Retroactive effectiveness is assessed, as well as the continued expectation that the hedge will remain effective prospectively. After the initial quantitative assessment is performed, on a quarterly basis, the Company performs a qualitative hedge effectiveness assessment. This assessment takes into consideration any adverse developments related to the counterparty's risk of default and any negative events or circumstances that affect the factors that originally enabled the Company to assess that it could reasonably support, qualitatively, an expectation that the hedging relationship was and will continue to be highly effective. 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 the embedded derivative possesses economic characteristics that are not clearly and closely related to the economic characteristics of the host contract and 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 the host contract is measured at fair value, with changes in fair value reported in current earnings, or 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 is considered, 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 the related tax liability line with other liabilities in the Consolidated Balance Sheet. See "Note 12. Income Taxes" of these Notes to Unaudited Consolidated Financial Statements for further discussion on income taxes.

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.

The Company also has off-balance sheet arrangements related to its derivative instruments. Derivative instruments are recognized in the Consolidated Financial Statements at fair value and their notional values are carried off-balance sheet. See "Note 10. Derivatives and Hedging Activities" of these Notes to Unaudited Consolidated Financial Statements for further discussion.

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 may purchase the asset or assume 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 March 31, 2019 and 2018. The estimated fair value amounts for March 31, 2019 and 2018 have been measured as of period-end, and have not been re-evaluated 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, cash equivalents, and restricted cash

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, exchange-listed preferred stock, and certain corporate debt securities are based on quoted market prices and are categorized as Level 1 in the fair value hierarchy.

The fair values of debt 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.

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 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 and customer repurchase agreements

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 and customer repurchase agreements have been categorized as Level 2 in the fair value hierarchy due to their short durations.

Subordinated debt

The fair value of subordinated debt is based on the market rate for the respective subordinated debt security. Subordinated debt has been categorized as Level 3 in the fair value hierarchy.

Junior subordinated debt

Junior subordinated debt is valued based on a discounted cash flow model which uses as inputs Treasury Bond rates and the 'BB' rated financial index. 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 2016, the FASB issued guidance within ASU 2016-13, Measurement of Credit Losses on Financial Instruments. The new standard significantly changes the impairment model for most financial assets that are measured at amortized cost, including off-balance sheet credit exposures, from an incurred loss model to an expected loss model. The amendments in ASU 2016-13 to Topic 326, Financial Instruments - Credit Losses, require that an organization measure all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The ASU also requires enhanced disclosures, including qualitative and quantitative disclosures that provide additional information about the amounts recorded in the financial statements. Additionally, the ASU amends the accounting for credit losses on AFS debt securities and purchased financial assets with credit deterioration. The amendments in this ASU are effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Management has formed a Steering Committee and established an implementation team made up of subject matter experts across different functions within the Company, including Finance, Risk, Credit, and IT, that will coordinate and facilitate all phases of planning and implementation of the new guidance. The Company has completed its loan portfolio stratification, with methodologies for measuring expected credit losses that include a combination of third-party vended models, internally-developed models, and simplified approaches. In addition, the Company has completed substantive pre-production runs and model validation activities, which encompass a majority of the Company’s loan portfolio. The implementation team is also updating the Company's accounting policies, designing key controls, and governance processes that are planned for implementation prior to adoption.

In August 2018, the FASB issued guidance within ASU 2018-13, Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The amendments within ASU 2018-13 remove, modify, and supplement the disclosure requirements for fair value measurements. Disclosure requirements that were removed include: the amount and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy, the policy for timing of transfers between levels, and the valuation processes for Level 3 fair value measurements. The amendments clarify that the measurement uncertainty disclosure is to communicate information about the uncertainty in measurement as of the reporting date. Additional disclosure requirements include: the changes in unrealized gains and losses for the period included in other comprehensive income for recurring Level 3 fair value measurements held at the end of the reporting period, and the range and weighted average of significant unobservable inputs used to develop Level 3 fair value measurements. With the exception of the above additional disclosure requirements, which will be applied prospectively, all other amendments should be applied retrospectively to all periods presented upon their effective date. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company's Consolidated Financial Statements.

In August 2018, the FASB issued guidance within ASU 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40). The amendments in this ASU align the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). Accordingly, the amendments in this Update require an entity (customer) in a hosting arrangement that is a service contract to follow the guidance in Subtopic 350-40 to determine which implementation costs to capitalize as an asset related to the service contract and which costs to expense. The amendments in this Update also require that the capitalized implementation costs of a hosting arrangement that is a service contract be expensed over the term of the hosting arrangement. Presentation requirements include: expense related to the capitalized implementation costs should be presented in the same line item in the statement of income as the fees associated with the hosting element (service) of the arrangement, payments for capitalized implementation costs in the statement of cash flows should be classified in the same manner as payments made for fees associated with the hosting element, and capitalized implementation costs in the statement of financial position should be presented in the same line item that a prepayment for the fees of the associated hosting arrangement would be presented. The amendments in this ASU should be applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The adoption of this guidance is not expected to have a significant impact on the Company's Consolidated Financial Statements.

Recently adopted accounting guidance

In February 2016, the FASB issued guidance within ASU 2016-02, Leases. The amendments in ASU 2016-02 to Topic 842, Leases, require lessees to recognize the lease assets and lease liabilities arising from operating leases in the statement of financial position. The accounting applied by a lessor is largely unchanged from that applied under previous GAAP. The Company adopted the amendments to Topic 842 on January 1, 2019 using the modified retrospective approach. The Company elected the transition option issued under ASU 2018-11, Leases (Topic 842) Targeted Improvements, which allows entities to continue to apply the legacy guidance in ASC 840, Leases, to prior periods, including disclosure requirements. Accordingly, prior period financial results and disclosures have not been adjusted. The Company also elected to apply the package of practical expedients permitting entities to forgo reassessment of 1) expired or existing contracts that may contain leases; 2) lease classification of expired or existing leases; and 3) initial direct costs for any existing leases. The Company established internal controls and implemented lease accounting software to facilitate the preparation of financial information and disclosures related to leases. The most significant impact of the new standard on the Company’s consolidated financial statements was the recognition of a ROU asset and lease liability for operating leases for which the Company is the lessee. The accounting for finance and operating leases for which the Company is the lessor remains substantially unchanged. Upon adoption of this guidance, on January 1, 2019, the Company recorded a ROU asset and corresponding lease liability of $42.5 million and $46.1 million, respectively, on the consolidated balance sheet. No cumulative effect adjustment to retained earnings resulted from adoption of this guidance. The new standard did not have a material impact on the Company’s results of operations or cash flows.

In March 2017, the FASB issued guidance within ASU 2017-08, Premium Amortization on Purchased Callable Debt Securities. The amendments in ASU 2017-08 to Subtopic 310-20, Receivables-Nonrefundable Fees and Other Costs, shorten the amortization period for certain purchased callable debt securities held at a premium to the earliest call date, which more closely align the amortization period of premiums and discounts to expectations incorporated in market pricing on the underlying securities. Under current GAAP, entities generally amortize the premium as an adjustment of yield over the contractual life of the instrument. The amendments do not require an accounting change for securities held at a discount; the discount continues to be amortized to maturity. The amendments in this ASU should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. As of March 31, 2019, the Company does not hold these types of securities, therefore, adoption of this guidance did not have an impact on the Company's Consolidated Financial Statements.

In June 2018, the FASB issued guidance within ASU 2018-07, Improvements to Nonemployee Share-Based Payment Accounting. The amendments in ASU 2018-07 to Topic 718, Compensation-Stock Compensation, are intended to align the accounting for share-based payment awards issued to employees and nonemployees. Changes to the accounting for nonemployee awards include: 1) equity classified share-based payment awards issued to nonemployees will now be measured on the grant date, instead of the previous requirement to remeasure the awards through the performance completion date; 2) for performance conditions, compensation cost associated with the award will be recognized when achievement of the performance condition is probable, rather than upon achievement of the performance condition; and 3) the current requirement to reassess the classification (equity or liability) for nonemployee awards upon vesting will be eliminated, except for awards in the form of convertible instruments. The new guidance also clarifies that any share-based payment awards issued to customers should be evaluated under ASC 606, Revenue from Contracts with Customers. The Company's share-based payment awards to nonemployees consist only of grants made to the Company's BOD as compensation solely related to the individual's role as a Director. As such, in accordance with ASC 718, the Company accounts for these share-based payment awards to its Directors in the same manner as share-based payment awards for its employees. Accordingly, the adoption of this guidance did not have an impact on the accounting for the Company's share-based payment awards to its Directors.

In July 2018, the FASB issued guidance within ASU 2018-09, Codification Improvements. The amendments in ASU 2018-09 are intended to clarify or correct unintended guidance in the FASB Codification and affect a wide variety of Topics in the Codification. The topics that are applicable to the Company include: 1) debt modifications and extinguishments; 2) stock compensation; and 3) derivatives and hedging. For debt modifications and extinguishments, the amendment clarifies that, in an early extinguishment of debt for which the fair value option has been elected, the net carrying amount of the extinguished debt is equal to its fair value at the reacquisition date, and upon extinguishment, the cumulative amount of the gain or loss on the extinguished debt that resulted from changes in instrument-specific credit risk should be presented in net income. The Company has junior subordinated debt that is recorded at fair value at each reporting period due to election of the FVO. Accordingly, if in the future, the Company chooses to repay this debt prior to its contractual maturity, this amendment would be applicable. For stock compensation, the amendment clarifies that excess tax benefits or tax deficiencies should be recognized in the period in which the amount of the tax deduction is determined, which is typically when an award is exercised (in the case of share options) or vests (in the case of non-vested stock awards). The Company already records excess tax benefits or tax deficiencies in the periods in which the tax deduction is determined. Therefore, adoption of this amendment did not have an effect on the Company's accounting for excess tax benefits or tax deficiencies. For derivatives and hedging, previous guidance permits derivatives to be offset only when all four conditions (including the intent to set off) are met. This amendment clarifies that the intent to set off is not required to offset fair value amounts recognized for derivative instruments that are executed with the same counterparty under a master netting agreement. This amendment did not have an effect on the offsetting of the Company's derivative assets and liabilities.

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Investment Securities (Tables)

3 Months Ended

Mar. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Carrying Amounts and Fair Values of Investment Securities

The carrying amounts and fair values of investment securities at March 31, 2019 and December 31, 2018 are summarized as follows:

	March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	310,865	$	20,218	$	—		$	331,083
Available-for-sale debt securities
CDO	$	50	$	14,976	$	—		$	15,026
Commercial MBS issued by GSEs	104,227		104		(5,232		)	99,099
Corporate debt securities	105,026		116		(8,100		)	97,042
Private label residential MBS	946,757		2,861		(14,271		)	935,347
Residential MBS issued by GSEs	1,509,590		2,408		(19,762		)	1,492,236
Tax-exempt	526,899		11,666		(1,575		)	536,990
Trust preferred securities	32,000		—		(3,383		)	28,617
U.S. government sponsored agency securities	40,000		—		(1,099		)	38,901
U.S. treasury securities	997		—		(8		)	989
Total AFS debt securities	$	3,265,546	$	32,131	$	(53,430	)	$	3,244,247
Equity securities
CRA investments	$	52,361	$	—	$	(747	)	$	51,614
Preferred stock	65,913		954		(476		)	66,391
Total equity securities	$	118,274	$	954	$	(1,223	)	$	118,005

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized (Losses)			Fair Value
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	302,905	$	3,163	$	(7,420	)	$	298,648
Available-for-sale debt securities
CDO	$	50	$	15,277	$	—		$	15,327
Commercial MBS issued by GSEs	106,385		82		(6,361		)	100,106
Corporate debt securities	105,029		—		(5,649		)	99,380
Private label residential MBS	948,161		945		(24,512		)	924,594
Residential MBS issued by GSEs	1,564,181		1,415		(35,472		)	1,530,124
Tax-exempt	542,086		4,335		(7,753		)	538,668
Trust preferred securities	32,000		—		(3,383		)	28,617
U.S. government sponsored agency securities	40,000		—		(1,812		)	38,188
U.S. treasury securities	1,996		—		(12		)	1,984
Total AFS debt securities	$	3,339,888	$	22,054	$	(84,954	)	$	3,276,988
Equity securities
CRA investments	$	52,210	$	—	$	(1,068	)	$	51,142
Preferred stock	65,954		148		(2,183		)	63,919
Total equity securities	$	118,164	$	148	$	(3,251	)	$	115,061

Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position

Information pertaining to securities with gross unrealized losses at March 31, 2019 and December 31, 2018, aggregated by investment category and length of time that individual securities have been in a continuous loss position follows: 

	March 31, 2019
	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 debt securities
Commercial MBS issued by GSEs	$	—	$	—	$	5,232	$	97,264	$	5,232	$	97,264
Corporate debt securities	—		—		8,100		91,900		8,100		91,900
Private label residential MBS	—		—		14,271		703,525		14,271		703,525
Residential MBS issued by GSEs	2		265		19,760		1,184,558		19,762		1,184,823
Tax-exempt	—		—		1,575		80,676		1,575		80,676
Trust preferred securities	—		—		3,383		28,617		3,383		28,617
U.S. government sponsored agency securities	—		—		1,099		33,901		1,099		33,901
U.S. treasury securities	—		—		8		989		8		989
Total AFS securities	$	2	$	265	$	53,428	$	2,221,430	$	53,430	$	2,221,695

	December 31, 2018
	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)
Held-to-maturity debt securities
Tax-exempt	$	3,868	$	91,095	$	3,552	$	69,991	$	7,420	$	161,086
Available-for-sale debt securities
Commercial MBS issued by GSEs	$	—	$	—	$	6,361	$	98,275	$	6,361	$	98,275
Corporate debt securities	16		5,013		5,633		94,367		5,649		99,380
Private label residential MBS	5,173		217,982		19,339		537,316		24,512		755,298
Residential MBS issued by GSEs	1,363		141,493		34,109		1,215,490		35,472		1,356,983
Tax-exempt	3,562		209,767		4,191		72,382		7,753		282,149
Trust preferred securities	—		—		3,383		28,617		3,383		28,617
U.S. government sponsored agency securities	—		—		1,812		38,188		1,812		38,188
U.S. treasury securities	—		—		12		1,984		12		1,984
Total AFS securities	$	10,114	$	574,255	$	74,840	$	2,086,619	$	84,954	$	2,660,874

Amortized Cost and Fair Value of Investment Securities by Contractual Maturities

The amortized cost and fair value of securities as of March 31, 2019, 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. 

	March 31, 2019
	Amortized Cost		Estimated Fair Value
	(in thousands)
Held-to-maturity
Due in one year or less	$	10,100	$	10,147
After five years through ten years	14,386		14,984
After ten years	286,379		305,952
Total HTM securities	$	310,865	$	331,083
Available-for-sale
Due in one year or less	$	2,296	$	2,313
After one year through five years	12,036		12,206
After five years through ten years	211,149		203,258
After ten years	479,491		499,788
Mortgage-backed securities	2,560,574		2,526,682
Total AFS securities	$	3,265,546	$	3,244,247

Investment Securities by Credit Rating Type

The following tables summarize the carrying amount of the Company’s investment ratings position as of March 31, 2019 and December 31, 2018: 

	March 31, 2019
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	310,865	$	310,865
Available-for-sale debt securities
CDO	$	—	$	—	$	—	$	—	$	—	$	15,026	$	—	$	15,026
Commercial MBS issued by GSEs	—		99,099		—		—		—		—		—		99,099
Corporate debt securities	—		—		—		64,300		32,742		—		—		97,042
Private label residential MBS	911,689		—		21,079		297		898		1,384		—		935,347
Residential MBS issued by GSEs	—		1,492,236		—		—		—		—		—		1,492,236
Tax-exempt	68,227		8,875		294,830		163,391		—		—		1,667		536,990
Trust preferred securities	—		—		—		—		28,617		—		—		28,617
U.S. government sponsored agency securities	—		38,901		—		—		—		—		—		38,901
U.S. treasury securities	—		989		—		—		—		—		—		989
Total AFS securities	$	979,916	$	1,640,100	$	315,909	$	227,988	$	62,257	$	16,410	$	1,667	$	3,244,247
Equity securities
CRA investments	$	—	$	25,375	$	—	$	—	$	—	$	—	$	26,239	$	51,614
Preferred stock	—		—		—		—		47,931		3,925		14,535		66,391
Total equity securities	$	—	$	25,375	$	—	$	—	$	47,931	$	3,925	$	40,774	$	118,005

(1)Where ratings differ, the Company uses an average of the available ratings by major credit agencies.

	December 31, 2018
	AAA		Split-rated AAA/AA+		AA+ to AA-		A+ to A-		BBB+ to BBB-		BB+ and below		Unrated		Totals
	(in thousands)
Held-to-maturity debt securities
Tax-exempt	$	—	$	—	$	—	$	—	$	—	$	—	$	302,905	$	302,905
Available-for-sale debt securities
CDO	$	—	$	—	$	—	$	—	$	—	$	15,327	$	—	$	15,327
Commercial MBS issued by GSEs	—		100,106		—		—		—		—		—		100,106
Corporate debt securities	—		—		—		66,515		32,865		—		—		99,380
Private label residential MBS	887,520		—		34,342		343		947		1,442		—		924,594
Residential MBS issued by GSEs	—		1,530,124		—		—		—		—		—		1,530,124
Tax-exempt	66,160		12,146		306,409		152,330		—		—		1,623		538,668
Trust preferred securities	—		—		—		—		28,617		—		—		28,617
U.S. government sponsored agency securities	—		38,188		—		—		—		—		—		38,188
U.S. treasury securities	—		1,984		—		—		—		—		—		1,984
Total AFS securities	$	953,680	$	1,682,548	$	340,751	$	219,188	$	62,429	$	16,769	$	1,623	$	3,276,988
Equity securities
CRA investments	$	—	$	25,375	$	—	$	—	$	—	$	—	$	25,767	$	51,142
Preferred stock	—		—		—		—		45,771		3,693		14,455		63,919
Total equity securities	$	—	$	25,375	$	—	$	—	$	45,771	$	3,693	$	40,222	$	115,061

(1) Where ratings differ, the Company uses an average of the available ratings by major credit agencies.

Gross Gains and (Losses) on Sales of Investment Securities

There were no gains and losses on sales of investment securities during the three months ended March 31, 2019 and March 31, 2018

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Loans, Leases and Allowance for Credit Losses (Tables)

3 Months Ended

Mar. 31, 2019

Receivables [Abstract]

Schedule of Held for Investment Loan Portfolio Composition of Loans, Leases and Allowance for Credit Losses

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

	March 31, 2019			December 31, 2018
	(in thousands)
Commercial and industrial	$	7,723,695		$	7,762,642
Commercial real estate - non-owner occupied	4,304,261			4,213,428
Commercial real estate - owner occupied	2,285,340			2,325,380
Construction and land development	2,283,527			2,134,753
Residential real estate	1,461,561			1,204,355
Consumer	58,364			70,071
Loans, net of deferred loan fees and costs	18,116,748			17,710,629
Allowance for credit losses	(154,987		)	(152,717		)
Total loans HFI	$	17,961,761		$	17,557,912

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:

	March 31, 2019
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 Days Past Due		Total Past Due		Total
	(in thousands)
Commercial and industrial	$	7,711,923	$	193	$	10,638	$	941	$	11,772	$	7,723,695
Commercial real estate
Owner occupied	2,281,389		2,630		1,321		—		3,951		2,285,340
Non-owner occupied	4,143,704		984		—		—		984		4,144,688
Multi-family	159,573		—		—		—		—		159,573
Construction and land development
Construction	1,497,960		—		—		—		—		1,497,960
Land	784,146		945		—		476		1,421		785,567
Residential real estate	1,439,763		13,660		2,736		5,402		21,798		1,461,561
Consumer	58,248		—		—		116		116		58,364
Total loans	$	18,076,706	$	18,412	$	14,695	$	6,935	$	40,042	$	18,116,748

	December 31, 2018
	Current		30-59 Days Past Due		60-89 Days Past Due		Over 90 days Past Due		Total Past Due		Total
	(in thousands)
Commercial and industrial	$	7,753,111	$	3,187	$	416	$	5,928	$	9,531	$	7,762,642
Commercial real estate
Owner occupied	2,320,321		4,441		—		618		5,059		2,325,380
Non-owner occupied	4,051,837		—		—		—		—		4,051,837
Multi-family	161,591		—		—		—		—		161,591
Construction and land development
Construction	1,382,664		—		—		—		—		1,382,664
Land	751,613		—		476		—		476		752,089
Residential real estate	1,182,933		9,316		4,010		8,096		21,422		1,204,355
Consumer	69,830		—		—		241		241		70,071
Total loans	$	17,673,900	$	16,944	$	4,902	$	14,883	$	36,729	$	17,710,629

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: 

	March 31, 2019								December 31, 2018
	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 and industrial	$	19,438	$	11,636	$	31,074	$	—	$	7,639	$	7,451	$	15,090	$	—
Commercial real estate
Owner occupied	420		—		420		—		—		—		—		594
Non-owner occupied	—		580		580		—		—		—		—		—
Multi-family	—		—		—		—		—		—		—		—
Construction and land development
Construction	3,307		—		3,307		—		—		476		476		—
Land	—		476		476		—		—		—		—		—
Residential real estate	1,168		6,746		7,914		—		552		11,387		11,939		—
Consumer	—		116		116		—		—		241		241		—
Total	$	24,333	$	19,554	$	43,887	$	—	$	8,191	$	19,555	$	27,746	$	594

Loans by Risk Rating

The following tables present gross loans by risk rating: 

	March 31, 2019
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial and industrial	$	7,548,610	$	70,708	$	103,828	$	549	$	—	$	7,723,695
Commercial real estate
Owner occupied	2,206,311		23,044		55,985		—		—		2,285,340
Non-owner occupied	4,095,492		36,114		13,082		—		—		4,144,688
Multi-family	159,573		—		—		—		—		159,573
Construction and land development
Construction	1,470,710		4,088		23,162		—		—		1,497,960
Land	785,070		—		497		—		—		785,567
Residential real estate	1,452,919		365		8,277		—		—		1,461,561
Consumer	58,208		29		127		—		—		58,364
Total	$	17,776,893	$	134,348	$	204,958	$	549	$	—	$	18,116,748

	March 31, 2019
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	17,760,118	$	134,268	$	181,862	$	458	$	—	$	18,076,706
Past due 30 - 59 days	14,947		35		3,339		91		—		18,412
Past due 60 - 89 days	1,494		45		13,156		—		—		14,695
Past due 90 days or more	334		—		6,601		—		—		6,935
Total	$	17,776,893	$	134,348	$	204,958	$	549	$	—	$	18,116,748

	December 31, 2018
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Commercial and industrial	$	7,574,506	$	61,202	$	126,356	$	578	$	—	$	7,762,642
Commercial real estate
Owner occupied	2,255,513		12,860		57,007		—		—		2,325,380
Non-owner occupied	4,030,350		12,982		8,505		—		—		4,051,837
Multi-family	161,591		—		—		—		—		161,591
Construction and land development
Construction	1,378,624		1,210		2,830		—		—		1,382,664
Land	751,012		—		1,077		—		—		752,089
Residential real estate	1,191,571		527		12,257		—		—		1,204,355
Consumer	69,755		75		241		—		—		70,071
Total	$	17,412,922	$	88,856	$	208,273	$	578	$	—	$	17,710,629

	December 31, 2018
	Pass		Special Mention		Substandard		Doubtful		Loss		Total
	(in thousands)
Current (up to 29 days past due)	$	17,400,616	$	87,264	$	186,020	$	—	$	—	$	17,673,900
Past due 30 - 59 days	11,255		1,580		4,109		—		—		16,944
Past due 60 - 89 days	719		12		3,767		404		—		4,902
Past due 90 days or more	332		—		14,377		174		—		14,883
Total	$	17,412,922	$	88,856	$	208,273	$	578	$	—	$	17,710,629

Impaired Loans by Loan Class

The following table presents impaired loans by class: 

	March 31, 2019		December 31, 2018
	(in thousands)
Commercial and industrial	$	78,768	$	63,896
Commercial real estate
Owner occupied	8,185		6,530
Non-owner occupied	12,268		12,407
Multi-family	—		—
Construction and land development
Construction	20,329		—
Land	8,286		9,403
Residential real estate	15,417		19,744
Consumer	145		272
Total	$	143,398	$	112,252

Recorded Investment in Loans Classified as Impaired

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

	March 31, 2019			December 31, 2018
	(in thousands)
Impaired loans with a specific valuation allowance under ASC 310 (1)	$	5,244		$	986
Impaired loans without a specific valuation allowance under ASC 310 (2)	138,154			111,266
Total impaired loans	$	143,398		$	112,252
Valuation allowance related to impaired loans	$	(1,357	)	$	(681	)

(1) Includes no TDR loans as of each of the periods ended at March 31, 2019 and December 31, 2018.

(2) Includes TDR loans of $68.9 million and $44.5 million at March 31, 2019 and December 31, 2018, respectively.

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Average balance on impaired loans	$	126,613	$	93,081
Interest income recognized on impaired loans	1,493		873
Interest recognized on non-accrual loans, cash basis	309		438

Average Investment in Impaired Loans by Loan Class

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Commercial and industrial	$	67,144	$	36,849
Commercial real estate
Owner occupied	7,569		9,043
Non-owner occupied	12,311		18,925
Multi-family	—		—
Construction and land development
Construction	12,451		—
Land	8,632		10,281
Residential real estate	18,278		17,799
Consumer	228		184
Total	$	126,613	$	93,081

Interest Income on Impaired Loans by Loan Class

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

	Three Months Ended March 31,
	2019		2018
	(in thousands)
Commercial and industrial	$	769	$	250
Commercial real estate
Owner occupied	123		127
Non-owner occupied	187		262
Multi-family	—		—
Construction and land development
Construction	180		—
Land	129		130
Residential real estate	105		104
Consumer	—		—
Total	$	1,493	$	873

Tabular Disclosure of Nonperforming Assets

The following table summarizes nonperforming assets: 

	March 31, 2019		December 31, 2018
	(in thousands)
Non-accrual loans (1)	$	43,887	$	27,746
Loans past due 90 days or more on accrual status	—		594
Accruing troubled debt restructured loans	52,488		36,458
Total nonperforming loans	96,375		64,798
Other assets acquired through foreclosure, net	17,707		17,924
Total nonperforming assets	$	114,082	$	82,722

(1) Includes non-accrual TDR loans of $16.4 million and $8.0 million at March 31, 2019 and December 31, 2018, respectively.

Accretable Yield Table

Changes in the accretable yield for loans acquired with deteriorated credit quality are as follows:

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Balance, at beginning of period	$	3,768		$	9,324
Reclassifications from non-accretable to accretable yield (1)	—			683
Accretion to interest income	(161		)	(313		)
Reversal of fair value adjustments upon disposition of loans	(470		)	(1,586		)
Balance, at end of period	$	3,137		$	8,108

(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 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		Consumer		Total Loans
	(in thousands)
Loans as of March 31, 2019;
Recorded Investment
Impaired loans with an allowance recorded	$	—	$	—	$	590	$	1,347	$	3,307	$	—	$	5,244
Impaired loans with no allowance recorded	8,185		12,268		78,178		14,070		25,308		145		138,154
Total loans individually evaluated for impairment	8,185		12,268		78,768		15,417		28,615		145		143,398
Loans collectively evaluated for impairment	2,273,235		4,232,710		7,644,927		1,446,125		2,254,912		58,219		17,910,128
Loans acquired with deteriorated credit quality	3,920		59,283		—		19		—		—		63,222
Total recorded investment	$	2,285,340	$	4,304,261	$	7,723,695	$	1,461,561	$	2,283,527	$	58,364	$	18,116,748
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	—	$	—	$	1,463	$	1,347	$	3,307	$	—	$	6,117
Impaired loans with no allowance recorded	13,479		14,398		117,839		22,428		41,528		10,505		220,177
Total loans individually evaluated for impairment	13,479		14,398		119,302		23,775		44,835		10,505		226,294
Loans collectively evaluated for impairment	2,273,235		4,232,710		7,644,927		1,446,125		2,254,912		58,219		17,910,128
Loans acquired with deteriorated credit quality	5,257		74,453		4,347		72		—		—		84,129
Total unpaid principal balance	$	2,291,971	$	4,321,561	$	7,768,576	$	1,469,972	$	2,299,747	$	68,724	$	18,220,551
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	—	$	—	$	297	$	250	$	810	$	—	$	1,357
Impaired loans with no allowance recorded	—		—		—		—		—		—		—
Total loans individually evaluated for impairment	—		—		297		250		810		—		1,357
Loans collectively evaluated for impairment	14,746		23,020		76,949		12,756		25,273		777		153,521
Loans acquired with deteriorated credit quality	—		101		8		—		—		—		109
Total allowance for credit losses	$	14,746	$	23,121	$	77,254	$	13,006	$	26,083	$	777	$	154,987

	Commercial Real Estate-Owner Occupied		Commercial Real Estate-Non-Owner Occupied		Commercial and Industrial		Residential Real Estate		Construction and Land Development		Consumer		Total Loans
	(in thousands)
Loans as of December 31, 2018;
Recorded Investment
Impaired loans with an allowance recorded	$	—	$	—	$	623	$	363	$	—	$	—	$	986
Impaired loans with no allowance recorded	6,530		12,407		63,273		19,381		9,403		272		111,266
Total loans individually evaluated for impairment	6,530		12,407		63,896		19,744		9,403		272		112,252
Loans collectively evaluated for impairment	2,314,871		4,121,464		7,698,746		1,184,592		2,125,350		69,799		17,514,822
Loans acquired with deteriorated credit quality	3,979		79,557		—		19		—		—		83,555
Total recorded investment	$	2,325,380	$	4,213,428	$	7,762,642	$	1,204,355	$	2,134,753	$	70,071	$	17,710,629
Unpaid Principal Balance
Impaired loans with an allowance recorded	$	—	$	—	$	1,482	$	363	$	—	$	—	$	1,845
Impaired loans with no allowance recorded	11,852		18,155		103,992		27,979		25,624		10,632		198,234
Total loans individually evaluated for impairment	11,852		18,155		105,474		28,342		25,624		10,632		200,079
Loans collectively evaluated for impairment	2,314,871		4,121,464		7,698,746		1,184,592		2,125,350		69,799		17,514,822
Loans acquired with deteriorated credit quality	5,315		95,680		4,352		72		—		—		105,419
Total unpaid principal balance	$	2,332,038	$	4,235,299	$	7,808,572	$	1,213,006	$	2,150,974	$	80,431	$	17,820,320
Related Allowance for Credit Losses
Impaired loans with an allowance recorded	$	—	$	—	$	621	$	60	$	—	$	—	$	681
Impaired loans with no allowance recorded	—		—		—		—		—		—		—
Total loans individually evaluated for impairment	—		—		621		60		—		—		681
Loans collectively evaluated for impairment	14,286		20,456		82,488		11,216		22,513		981		151,940
Loans acquired with deteriorated credit quality	—		87		9		—		—		—		96
Total allowance for credit losses	$	14,286	$	20,543	$	83,118	$	11,276	$	22,513	$	981	$	152,717

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

	Three Months Ended March 31,
	Construction and Land Development			Commercial Real Estate			Residential Real Estate			Commercial and Industrial			Consumer			Total
	(in thousands)
2019
Beginning Balance	$	22,513		$	34,829		$	11,276		$	83,118		$	981		$	152,717
Charge-offs	—			—			188			2,124			1			2,313
Recoveries	(55		)	(453		)	(93		)	(477		)	(5		)	(1,083		)
Provision	3,515			2,585			1,825			(4,217		)	(208		)	3,500
Ending balance	$	26,083		$	37,867		$	13,006		$	77,254		$	777		$	154,987
2018
Beginning Balance	$	19,511		$	31,495		$	5,478		$	82,793		$	773		$	140,050
Charge-offs	—			—			107			3,517			—			3,624
Recoveries	(1,388		)	(126		)	(250		)	(459		)	(10		)	(2,233		)
Provision	1,695			1,247			(102		)	3,143			17			6,000
Ending balance	$	22,594		$	32,868		$	5,519		$	82,878		$	800		$	144,659

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Leases (Tables)

3 Months Ended

Mar. 31, 2019

Leases [Abstract]

Lessee, Operating Lease, Liability, Maturity [Table Text Block]

The following is a schedule of the Company's operating lease liabilities by contractual maturity as of March 31, 2019:

	(in thousands)
2019	$	9,099
2020	11,200
2021	9,186
2022	7,992
2023	8,002
Thereafter	45,503
Total lease payments	$	90,982
Less: imputed interest	13,232
Total present value of lease liabilities	$	77,750

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Lease Obligations as of December 31, 2018

As previously disclosed in the Company's Annual Report on Form 10-K as of and for the year ended December 31, 2018, the following is a schedule of future minimum rental payments under its non-cancelable operating leases, expiring through 2030:

	(in thousands)
2019	$	11,370
2020	10,322
2021	7,418
2022	6,294
2023	6,070
Thereafter	15,417
Total future minimum rental payments	$	56,891

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Other Assets Acquired Through Foreclosure (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019
	Gross Balance			Valuation Allowance			Net Balance
	(in thousands)
Balance, beginning of period	$	19,979		$	(2,055	)	$	17,924
Charitable contribution	(232		)	114			(118		)
Valuation adjustments, net	—			(99		)	(99		)
Balance, end of period	$	19,747		$	(2,040	)	$	17,707
	2018
Balance, beginning of period	$	32,552		$	(4,012	)	$	28,540
Transfers to other assets acquired through foreclosure, net	5,744			—			5,744
Proceeds from sale of other real estate owned and repossessed assets, net	(5,294		)	9			(5,285		)
Valuation adjustments, net	—			(47		)	(47		)
Gains (losses), net (1)	1,242			—			1,242
Balance, end of period	$	34,244		$	(4,050	)	$	30,194

(1) There were zero and $1.0 millioninnet gains related to initial transfers to other assets during the three months ended March 31, 2019

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Other Borrowings (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Company's Borrowings

The following table summarizes the Company’s borrowings as of March 31, 2019 and December 31, 2018: 

	March 31, 2019		December 31, 2018
	(in thousands)
Short-Term:
Federal funds purchased	$	—	$	256,000
FHLB advances	—		235,000
Total short-term borrowings	$	—	$	491,000

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Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	Unrealized holding gains (losses) on AFS			Unrealized holding gains (losses) on SERP			Unrealized holding gains (losses) on junior subordinated debt			Impairment loss on securities		Total
	(in thousands)
Balance, December 31, 2018	$	(47,591	)	$	392		$	13,433		$	144	$	(33,622	)
Other comprehensive income (loss) before reclassifications	31,377			(18		)	(5,928		)	—		25,431
Amounts reclassified from AOCI	—			—			—			—		—
Net current-period other comprehensive income (loss)	31,377			(18		)	(5,928		)	—		25,431
Balance, March 31, 2019	$	(16,214	)	$	374		$	7,505		$	144	$	(8,191	)
Balance, December 31, 2017	$	(10,026	)	$	385		$	6,352		$	144	$	(3,145	)
Balance, January 1, 2018 (1)	(12,556		)	469			7,740			144		(4,203		)
Other comprehensive (loss) income before reclassifications	(38,914		)	(11		)	1,466			—		(37,459		)
Amounts reclassified from AOCI	—			—			—			—		—
Net current-period other comprehensive (loss) income	(38,914		)	(11		)	1,466			—		(37,459		)
Balance, March 31, 2018	$	(51,470	)	$	458		$	9,206		$	144	$	(41,662	)

(1) As adjusted for adoption of ASU 2016-01 and ASU 2018-02. The cumulative effect of adoption of this guidance at January 1, 2018 resulted in an increase to retained earnings of $1.1 million and a corresponding decrease to accumulated other comprehensive income.

Schedule of Reclassifications Out of Accumulated Other Comprehensive Income

reclassified out of accumulated other comprehensive loss. 

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Derivatives and Hedging (Tables)

3 Months Ended

Mar. 31, 2019

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:

	March 31, 2019						December 31, 2018						March 31, 2018
			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	$	961,493	$	987	$	48,332	$	965,705	$	2,162	$	44,892	$	989,379	$	3,533	$	42,789
Total	961,493		987		48,332		965,705		2,162		44,892		989,379		3,533		42,789
Netting adjustments (1)	—		987		987		—		2,162		2,162		—		3,493		3,493
Net derivatives in the balance sheet	$	961,493	$	—	$	47,345	$	965,705	$	—	$	42,730	$	989,379	$	40	$	39,296
Derivatives not designated as hedging instruments:
Foreign currency contracts	$	42,113	$	715	$	511	$	49,690	$	454	$	201	$	90,855	$	684	$	394
Interest rate swaps	2,348		12		12		2,378		27		27		36,840		1,170		1,170
Total	$	44,461	$	727	$	523	$	52,068	$	481	$	228	$	127,695	$	1,854	$	1,564

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

Largest Exposure To Individual Counterparty

The following table summarizes the Company's largest exposure to an individual counterparty at the dates indicated:

	March 31, 2019		December 31, 2018		March 31, 2018
	(in thousands)
Largest gross exposure (derivative asset) to an individual counterparty	$	987	$	1,411	$	2,515
Collateral posted by this counterparty	—		—		—
Derivative liability with this counterparty	32,250		23,906		20,624
Collateral pledged to this counterparty	40,035		25,761		29,719
Net exposure after netting adjustments and collateral	$	—	$	—	$	—

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Earnings per Share (Tables)

3 Months Ended

Mar. 31, 2019

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 March 31,
	2019		2018
	(in thousands, except per share amounts)
Weighted average shares - basic	104,033		104,530
Dilutive effect of stock awards	442		794
Weighted average shares - diluted	104,475		105,324
Net income	$	120,796	$	100,900
Earnings per share - basic	1.16		0.97
Earnings per share - diluted	1.16		0.96

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2019

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: 

	March 31, 2019		December 31, 2018
	(in thousands)
Commitments to extend credit, including unsecured loan commitments of $864,740 at March 31, 2019 and $770,114 at December 31, 2018	$	8,197,452	$	7,556,741
Credit card commitments and financial guarantees	251,675		237,312
Standby letters of credit, including unsecured letters of credit of $16,336 at March 31, 2019 and $21,879 at December 31, 2018	262,320		390,161
Total	$	8,711,447	$	8,184,214

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Fair Value Accounting (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

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

For the three months ended March 31, 2019 and 2018, unrealized gains and losses from fair value changes on junior subordinated debt were as follows:

	Three Months Ended March 31,
	2019			2018
	(in thousands)
Unrealized gains/(losses)	$	(7,862	)	$	1,944
Changes included in OCI, net of tax	(5,928		)	1,466

Fair Value of Assets and Liabilities

The fair value of assets and liabilities measured at fair value on a recurring basis was 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)
March 31, 2019
Assets:
Available-for-sale debt securities
CDO	$	—	$	15,026	$	—	$	15,026
Commercial MBS issued by GSEs	—		99,099		—		99,099
Corporate debt securities	5,142		91,900		—		97,042
Private label residential MBS	—		935,347		—		935,347
Residential MBS issued by GSEs	—		1,492,236		—		1,492,236
Tax-exempt	—		536,990		—		536,990
Trust preferred securities	—		28,617		—		28,617
U.S. government sponsored agency securities	—		38,901		—		38,901
U.S. treasury securities	—		989		—		989
Total AFS debt securities	$	5,142	$	3,239,105	$	—	$	3,244,247
Equity securities
CRA investments	$	51,614	$	—	$	—	$	51,614
Preferred stock	66,391		—		—		66,391
Total equity securities	$	118,005	$	—	$	—	$	118,005
Derivative assets (1)	$	—	$	1,714	$	—	$	1,714
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	56,546	$	56,546
Derivative liabilities (1)	—		48,855		—		48,855

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans is decreased by $33,123 and the net carrying value of subordinated debt is increased by $14,222 as of March 31, 2019 for the effective portion of the hedge, which relates to the fair value 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, 2018
Assets:
Available-for-sale debt securities
CDO	$	—	$	15,327	$	—	$	15,327
Commercial MBS issued by GSEs	—		100,106		—		100,106
Corporate debt securities	—		99,380		—		99,380
Private label residential MBS	—		924,594		—		924,594
Residential MBS issued by GSEs	—		1,530,124		—		1,530,124
Tax-exempt	—		538,668		—		538,668
Trust preferred securities	—		28,617		—		28,617
U.S. government sponsored agency securities	—		38,188		—		38,188
U.S. treasury securities	—		1,984		—		1,984
Total AFS debt securities	$	—	$	3,276,988	$	—	$	3,276,988
Equity securities
CRA investments	$	51,142	$	—	$	—	$	51,142
Preferred stock	63,919		—		—		63,919
Total equity securities	$	115,061	$	—	$	—	$	115,061
Derivative assets (1)	$	—	$	2,643	$	—	$	2,643
Liabilities:
Junior subordinated debt (2)	$	—	$	—	$	48,684	$	48,684
Derivative liabilities (1)	—		45,120		—		45,120

(1) Derivative assets and liabilities relate to interest rate swaps, see "Note 10. Derivatives and Hedging Activities." In addition, the carrying value of loans is increased by $23,039 and the net carrying value of subordinated debt is decreased by $19,691 as of December 31, 2018 for the effective portion of the hedge, which relates to the fair value 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.

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

For the three months ended March 31, 2019 and 2018, the change in Level 3 liabilities measured at fair value on a recurring basis was as follows:

	Junior Subordinated Debt
	Three Months Ended March 31,
	2019			2018
	(in thousands)
Beginning balance	$	(48,684	)	$	(56,234	)
Change in fair value (1)	(7,862		)	1,944
Ending balance	$	(56,546	)	$	(54,290	)

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 March 31, 2019;
Impaired loans with specific valuation allowance	$	3,887	$	—	$	—	$	3,887
Impaired loans without specific valuation allowance (1)	122,723		—		—		122,723
Other assets acquired through foreclosure	17,707		—		—		17,707
As of December 31, 2018:
Impaired loans with specific valuation allowance	$	305	$	—	$	—	$	305
Impaired loans without specific valuation allowance (1)	91,821		—		—		91,821
Other assets acquired through foreclosure	17,924		—		—		17,924

(1) Net of loan balances with charge-offs of $15.4 million and $19.4 million as of March 31, 2019 and December 31, 2018, respectively.

Estimated Fair Value of Financial Instruments

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

	March 31, 2019
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Federal funds sold	$	290,000	$	—	$	290,000	$	—	$	290,000
Investment securities:
HTM	310,865		—		331,083		—		331,083
AFS	3,244,247		5,142		3,239,105		—		3,244,247
Equity	118,005		118,005		—		—		118,005
Derivative assets	1,714		—		1,714		—		1,714
Loans, net	17,961,761		—		17,344,300		126,610		17,470,910
Accrued interest receivable	98,128		—		98,128		—		98,128
Financial liabilities:
Deposits	$	20,208,740	$	—	$	20,225,997	$	—	$	20,225,997
Customer repurchase agreements	15,141		—		15,141		—		15,141
Qualifying debt	373,996		—		332,988		67,730		400,718
Derivative liabilities	48,855		—		48,855		—		48,855
Accrued interest payable	15,853		—		15,853		—		15,853

	December 31, 2018
	Carrying Amount		Fair Value
			Level 1		Level 2		Level 3		Total
	(in thousands)
Financial assets:
Investment securities:
HTM	$	302,905	$	—	$	298,648	$	—	$	298,648
AFS	3,276,988		—		3,276,988		—		3,276,988
Equity securities	115,061		115,061		—		—		115,061
Derivative assets	2,643		—		2,643		—		2,643
Loans, net	17,557,912		—		16,857,852		92,126		16,949,978
Accrued interest receivable	101,275		—		101,275		—		101,275
Financial liabilities:
Deposits	$	19,177,447	$	—	$	19,188,216	$	—	$	19,188,216
Customer repurchase agreements	22,411		—		22,411		—		22,411
Other borrowings	491,000		—		491,000		—		491,000
Qualifying debt	360,458		—		323,572		57,924		381,496
Derivative liabilities	45,120		—		45,120		—		45,120
Accrued interest payable	20,463		—		20,463		—		20,463

XML

Segments (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Operating Segment Information

The following is a summary of operating segment information for the periods indicated:

				Regional Segments
Balance Sheet:	Consolidated Company			Arizona			Nevada			Southern California			Northern California
At March 31, 2019	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	4,525.0		$	2.3		$	9.1		$	2.0		$	1.9
Loans, net of deferred loan fees and costs	18,116.7			3,653.9			2,069.4			2,249.8			1,197.2
Less: allowance for credit losses	(155.0		)	(31.9		)	(18.3		)	(20.1		)	(9.4		)
Total loans	17,961.7			3,622.0			2,051.1			2,229.7			1,187.8
Other assets acquired through foreclosure, net	17.7			0.7			13.9			—			—
Goodwill and other intangible assets, net	298.8			—			23.2			—			155.3
Other assets	989.6			47.6			58.4			15.2			24.3
Total assets	$	23,792.8		$	3,672.6		$	2,155.7		$	2,246.9		$	1,369.3
Liabilities:
Deposits	$	20,208.7		$	5,319.9		$	4,006.8		$	2,793.8		$	2,008.7
Borrowings and qualifying debt	374.0			—			—			—			—
Other liabilities	489.5			11.6			12.0			0.5			13.4
Total liabilities	21,072.2			5,331.5			4,018.8			2,794.3			2,022.1
Allocated equity:	2,720.6			447.7			283.1			260.5			298.9
Total liabilities and stockholders' equity	$	23,792.8		$	5,779.2		$	4,301.9		$	3,054.8		$	2,321.0
Excess funds provided (used)	—			2,106.6			2,146.2			807.9			951.7

Income Statement:
Three Months Ended March 31, 2019	(in thousands)
Net interest income	$	247,336		$	55,226		$	39,096		$	30,477		$	23,033
Provision for (recovery of) credit losses	3,500			161			533			733			(719		)
Net interest income after provision for credit losses	243,836			55,065			38,563			29,744			23,752
Non-interest income	15,410			1,521			2,573			1,001			2,220
Non-interest expense	(112,914		)	(22,248		)	(15,781		)	(14,583		)	(13,490		)
Income (loss) before income taxes	146,332			34,338			25,355			16,162			12,482
Income tax expense (benefit)	25,536			8,584			5,325			4,525			3,495
Net income	$	120,796		$	25,754		$	20,030		$	11,637		$	8,987

	National Business Lines
Balance Sheet:	HOA Services			Public & Nonprofit Finance			Technology & Innovation			Hotel Franchise Finance			Other NBLs			Corporate & Other
At March 31, 2019
Assets:	(in millions)
Cash, cash equivalents, and investment securities	$	—		$	—		$	—		$	—		$	—		$	4,509.7
Loans, net of deferred loan fees and costs	209.4			1,561.7			1,057.3			1,564.9			4,549.0			4.1
Less: allowance for credit losses	(1.9		)	(14.8		)	(8.4		)	(9.5		)	(40.7		)	—
Total loans	207.5			1,546.9			1,048.9			1,555.4			4,508.3			4.1
Other assets acquired through foreclosure, net	—			—			—			—			—			3.1
Goodwill and other intangible assets, net	—			—			120.2			0.1			—			—
Other assets	0.9			12.5			6.4			7.7			58.8			757.8
Total assets	$	208.4		$	1,559.4		$	1,175.5		$	1,563.2		$	4,567.1		$	5,274.7
Liabilities:
Deposits	$	2,963.0		$	—		$	2,404.7		$	—		$	5.3		$	706.5
Borrowings and qualifying debt	—			—			—			—			—			374.0
Other liabilities	2.0			34.0			—			(0.3		)	60.9			355.4
Total liabilities	2,965.0			34.0			2,404.7			(0.3		)	66.2			1,435.9
Allocated equity:	77.7			126.0			253.3			130.3			374.3			468.8
Total liabilities and stockholders' equity	$	3,042.7		$	160.0		$	2,658.0		$	130.0		$	440.5		$	1,904.7
Excess funds provided (used)	2,834.3			(1,399.4		)	1,482.5			(1,433.2		)	(4,126.6		)	(3,370.0		)

Income Statement:
Three Months Ended March 31, 2019	(in thousands)
Net interest income	$	20,641		$	3,423		$	29,403		$	12,944		$	25,691		$	7,402
Provision for (recovery of) credit losses	(27		)	(41		)	(917		)	799			2,978			—
Net interest income after provision for credit losses	20,668			3,464			30,320			12,145			22,713			7,402
Non-interest income	96			—			3,362			—			657			3,980
Non-interest expense	(8,460		)	(1,907		)	(11,889		)	(2,398		)	(9,336		)	(12,822		)
Income (loss) before income taxes	12,304			1,557			21,793			9,747			14,034			(1,440		)
Income tax expense (benefit)	2,830			358			5,012			2,242			3,228			(10,063		)
Net income	$	9,474		$	1,199		$	16,781		$	7,505		$	10,806		$	8,623

				Regional Segments
	Consolidated Company			Arizona			Nevada			Southern California			Northern California
At December 31, 2018	(in millions)
Assets:
Cash, cash equivalents, and investment securities	$	4,259.7		$	2.5		$	10.9		$	2.5		$	3.0
Loans, net of deferred loan fees and costs	17,710.6			3,647.9			2,003.5			2,161.1			1,300.2
Less: allowance for credit losses	(152.7		)	(30.7		)	(18.7		)	(19.8		)	(10.7		)
Total loans	17,557.9			3,617.2			1,984.8			2,141.3			1,289.5
Other assets acquired through foreclosure, net	17.9			0.8			13.9			—			—
Goodwill and other intangible assets, net	299.2			—			23.2			—			155.5
Other assets	974.8			46.9			57.8			14.2			23.9
Total assets	$	23,109.5		$	3,667.4		$	2,090.6		$	2,158.0		$	1,471.9
Liabilities:
Deposits	$	19,177.4		$	5,090.2		$	3,996.4		$	2,347.5		$	1,839.1
Borrowings and qualifying debt	851.5			—			—			—			—
Other liabilities	466.9			10.4			14.5			4.5			12.2
Total liabilities	20,495.8			5,100.6			4,010.9			2,352.0			1,851.3
Allocated equity:	2,613.7			441.0			277.4			242.9			304.1
Total liabilities and stockholders' equity	$	23,109.5		$	5,541.6		$	4,288.3		$	2,594.9		$	2,155.4
Excess funds provided (used)	—			1,874.2			2,197.7			436.9			683.5

Income Statement:
Three Months Ended March 31, 2018	(in thousands)
Net interest income (expense)	$	214,220		$	54,555		$	36,690		$	27,802		$	22,255
Provision for (recovery of) credit losses	6,000			1,434			(1,723		)	729			1,548
Net interest income (expense) after provision for credit losses	208,220			53,121			38,413			27,073			20,707
Non-interest income	11,643			1,416			3,333			1,001			2,547
Non-interest expense	(98,149		)	(21,504		)	(14,084		)	(13,646		)	(12,503		)
Income (loss) before income taxes	121,714			33,033			27,662			14,428			10,751
Income tax expense (benefit)	20,814			8,321			5,903			4,135			3,098
Net income	$	100,900		$	24,712		$	21,759		$	10,293		$	7,653

	National Business Lines
	HOA Services			Public & Nonprofit Finance			Technology & Innovation			Hotel Franchise Finance			Other NBLs			Corporate & Other
At December 31, 2018
Assets:	(in millions)
Cash, cash equivalents, and investment securities	$	—		$	—		$	—		$	—		$	—		$	4,240.8
Loans, net of deferred loan fees and costs	210.0			1,547.5			1,200.9			1,479.9			4,154.9			4.7
Less: allowance for credit losses	(1.9		)	(14.2		)	(10.0		)	(8.5		)	(38.2		)	—
Total loans	208.1			1,533.3			1,190.9			1,471.4			4,116.7			4.7
Other assets acquired through foreclosure, net	—			—			—			—			—			3.2
Goodwill and other intangible assets, net	—			—			120.4			0.1			—			—
Other assets	0.9			20.1			6.3			7.2			37.1			760.4
Total assets	$	209.0		$	1,553.4		$	1,317.6		$	1,478.7		$	4,153.8		$	5,009.1
Liabilities:
Deposits	$	2,607.2		$	—		$	2,559.0		$	—		$	—		$	738.0
Borrowings and qualifying debt	—			—			—			—			—			851.5
Other liabilities	2.1			25.2			0.1			0.4			49.6			347.9
Total liabilities	2,609.3			25.2			2,559.1			0.4			49.6			1,937.4
Allocated equity:	70.7			123.9			268.7			122.3			340.0			422.7
Total liabilities and stockholders' equity	$	2,680.0		$	149.1		$	2,827.8		$	122.7		$	389.6		$	2,360.1
Excess funds provided (used)	2,471.0			(1,404.3		)	1,510.2			(1,356.0		)	(3,764.2		)	(2,649.0		)

Income Statement:
Three Months Ended March 31, 2018	(in thousands)
Net interest income (expense)	$	15,359		$	3,746		$	22,821		$	14,185		$	18,811		$	(2,004	)
Provision for (recovery of) credit losses	47			(207		)	1,651			1,236			1,285			—
Net interest income (expense) after provision for credit losses	15,312			3,953			21,170			12,949			17,526			(2,004		)
Non-interest income	150			—			3,051			13			224			(92		)
Non-interest expense	(7,803		)	(2,174		)	(9,833		)	(2,206		)	(5,662		)	(8,734		)
Income (loss) before income taxes	7,659			1,779			14,388			10,756			12,088			(10,830		)
Income tax expense (benefit)	1,761			409			3,309			2,474			2,780			(11,376		)
Net income	$	5,898		$	1,370		$	11,079		$	8,282		$	9,308		$	546

XML

Summary of Significant Accounting Policies - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Subsidiary	Dec. 31, 2018 USD ($)
Significant Of Accounting Policies [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018 | $	$ 3,244,247	$ 3,276,988
Number Of Wholly Owned Subsidiaries Non Bank Subsidiaries	2
Number Of Unconsolidated Subsidiaries	8

XML

Investment Securities - Carrying Amounts and Fair Values of Investment Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	$ 118,005	$ 115,061
Debt Securities, Held-to-maturity	310,865	302,905
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	20,218	3,163
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	0	(7,420)
Debt Securities, Held-to-maturity, Fair Value	331,083	298,648
Securities available for sale Total, Amortized Cost	3,265,546	3,339,888
Securities available-for-sale, Gross Unrealized Gains	32,131	22,054
Securities available-for-sale, Gross Unrealized (Losses)	(53,430)	(84,954)
Securities available for sale Total, Estimated Fair Value	3,244,247	3,276,988
Equity Securities, FV-NI, Cost	118,274	118,164
Equity Securities, FV-NI, Unrealized Gain	954	148
Equity Securities, FV-NI, Unrealized Loss	1,223	3,251
Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	50	50
Securities available-for-sale, Gross Unrealized Gains	14,976	15,277
Securities available-for-sale, Gross Unrealized (Losses)	0	0
Securities available for sale Total, Estimated Fair Value	15,026	15,327
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	104,227	106,385
Securities available-for-sale, Gross Unrealized Gains	104	82
Securities available-for-sale, Gross Unrealized (Losses)	(5,232)	(6,361)
Securities available for sale Total, Estimated Fair Value	99,099	100,106
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	105,026	105,029
Securities available-for-sale, Gross Unrealized Gains	116	0
Securities available-for-sale, Gross Unrealized (Losses)	(8,100)	(5,649)
Securities available for sale Total, Estimated Fair Value	97,042	99,380
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	946,757	948,161
Securities available-for-sale, Gross Unrealized Gains	2,861	945
Securities available-for-sale, Gross Unrealized (Losses)	(14,271)	(24,512)
Securities available for sale Total, Estimated Fair Value	935,347	924,594
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	1,509,590	1,564,181
Securities available-for-sale, Gross Unrealized Gains	2,408	1,415
Securities available-for-sale, Gross Unrealized (Losses)	(19,762)	(35,472)
Securities available for sale Total, Estimated Fair Value	1,492,236	1,530,124
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	310,865	302,905
Securities available for sale Total, Amortized Cost	526,899	542,086
Securities available-for-sale, Gross Unrealized Gains	11,666	4,335
Securities available-for-sale, Gross Unrealized (Losses)	(1,575)	(7,753)
Securities available for sale Total, Estimated Fair Value	536,990	538,668
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	32,000	32,000
Securities available-for-sale, Gross Unrealized Gains	0	0
Securities available-for-sale, Gross Unrealized (Losses)	(3,383)	(3,383)
Securities available for sale Total, Estimated Fair Value	28,617	28,617
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	40,000	40,000
Securities available-for-sale, Gross Unrealized Gains	0	0
Securities available-for-sale, Gross Unrealized (Losses)	(1,099)	(1,812)
Securities available for sale Total, Estimated Fair Value	38,901	38,188
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Amortized Cost	997	1,996
Securities available-for-sale, Gross Unrealized Gains	0	0
Securities available-for-sale, Gross Unrealized (Losses)	(8)	(12)
Securities available for sale Total, Estimated Fair Value	989	1,984
CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	51,614	51,142
Equity Securities, FV-NI, Cost	52,361	52,210
Equity Securities, FV-NI, Unrealized Gain	0	0
Equity Securities, FV-NI, Unrealized Loss	747	1,068
Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	66,391	63,919
Equity Securities, FV-NI, Cost	65,913	65,954
Equity Securities, FV-NI, Unrealized Gain	954	148
Equity Securities, FV-NI, Unrealized Loss	476	2,183
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Securities available for sale Total, Estimated Fair Value	979,916	953,680
AAA [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	911,689	887,520
AAA [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0	0
Securities available for sale Total, Estimated Fair Value	68,227	66,160
AAA [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AAA [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
AAA [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Split-rated AAA/AA Plus [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	25,375	25,375
Securities available for sale Total, Estimated Fair Value	1,640,100	1,682,548
Split-rated AAA/AA Plus [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	99,099	100,106
Split-rated AAA/AA Plus [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Split-rated AAA/AA Plus [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Split-rated AAA/AA Plus [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	1,492,236	1,530,124
Split-rated AAA/AA Plus [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0	0
Securities available for sale Total, Estimated Fair Value	8,875	12,146
Split-rated AAA/AA Plus [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Split-rated AAA/AA Plus [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	38,901	38,188
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	989	1,984
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	25,375	25,375
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
AA Plus to AA- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Securities available for sale Total, Estimated Fair Value	315,909	340,751
AA Plus to AA- [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	21,079	34,342
AA Plus to AA- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0	0
Securities available for sale Total, Estimated Fair Value	294,830	306,409
AA Plus to AA- [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
AA Plus to AA- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
AA Plus to AA- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
A Plus to A- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Securities available for sale Total, Estimated Fair Value	227,988	219,188
A Plus to A- [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
A Plus to A- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	64,300	66,515
A Plus to A- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	297	343
A Plus to A- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
A Plus to A- [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0	0
Securities available for sale Total, Estimated Fair Value	163,391	152,330
A Plus to A- [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
A Plus to A- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
A Plus to A- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
A Plus to A- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
A Plus to A- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
BBB Plus to BBB- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	47,931	45,771
Securities available for sale Total, Estimated Fair Value	62,257	62,429
BBB Plus to BBB- [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BBB Plus to BBB- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	32,742	32,865
BBB Plus to BBB- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	898	947
BBB Plus to BBB- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BBB Plus to BBB- [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0	0
Securities available for sale Total, Estimated Fair Value	0	0
BBB Plus to BBB- [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	28,617	28,617
BBB Plus to BBB- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BBB Plus to BBB- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	47,931	45,771
BB Plus and below [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	3,925	3,693
Securities available for sale Total, Estimated Fair Value	16,410	16,769
BB Plus and below [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	15,026	15,327
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	1,384	1,442
BB Plus and below [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	0	0
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
BB Plus and below [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
BB Plus and below [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	3,925	3,693
Corporate Credit Quality Indicator Unrated [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	40,774	40,222
Securities available for sale Total, Estimated Fair Value	1,667	1,623
Corporate Credit Quality Indicator Unrated [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity	310,865	302,905
Securities available for sale Total, Estimated Fair Value	1,667	1,623
Corporate Credit Quality Indicator Unrated [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Securities available for sale Total, Estimated Fair Value	0	0
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	26,239	25,767
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	$ 14,535	$ 14,455

XML

Investment Securities - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2019 USD ($) positions	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($) positions
Investment Identifier [Line Items]
Number Of Securities In Unrealized Position | positions	230		373
Amount of impairment losses reclassified out of accumulated other comprehensive income into earnings	$ 0	$ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	53,430,000		$ 84,954,000
Securities with carrying amounts were pledged	$ 940,000,000		$ 788,400,000

XML

Investment Securities - Unrealized Losses and Fair Value of Investment Securities in Continuous Unrealized Loss Position (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss			$ 3,868
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, Less than 12 Months, Fair Value			91,095
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss			3,552
Debt Securities, Held-to-maturity, Continuous Unrealized Loss Position, 12 Months or Longer, Fair Value			69,991
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain			7,420
Held-to-maturity Securities, Fair Value			161,086
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	$ 2		10,114
Available-for-sale securities, Less Than Twelve Months, Fair Value	265		574,255
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	53,428		74,840
Available-for-sale securities, Twelve Months or Longer, Fair Value	2,221,430		2,086,619
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	53,430		84,954
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	2,221,695		2,660,874
Equity Securities, FV-NI, Unrealized Gain (Loss)	2,834	$ (1,074)
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [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	1,099		1,812
Available-for-sale securities, Twelve Months or Longer, Fair Value	33,901		38,188
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	1,099		1,812
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	33,901		38,188
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0		16
Available-for-sale securities, Less Than Twelve Months, Fair Value	0		5,013
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	8,100		5,633
Available-for-sale securities, Twelve Months or Longer, Fair Value	91,900		94,367
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	8,100		5,649
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	91,900		99,380
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	2		1,363
Available-for-sale securities, Less Than Twelve Months, Fair Value	265		141,493
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	19,760		34,109
Available-for-sale securities, Twelve Months or Longer, Fair Value	1,184,558		1,215,490
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	19,762		35,472
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	1,184,823		1,356,983
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0		3,562
Available-for-sale securities, Less Than Twelve Months, Fair Value	0		209,767
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	1,575		4,191
Available-for-sale securities, Twelve Months or Longer, Fair Value	80,676		72,382
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	1,575		7,753
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	80,676		282,149
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Available-for-sale securities, Less Than Twelve Months, Aggregate Losses	0		5,173
Available-for-sale securities, Less Than Twelve Months, Fair Value	0		217,982
Available-for-sale securities, Twelve Months or Longer, Aggregate Losses	14,271		19,339
Available-for-sale securities, Twelve Months or Longer, Fair Value	703,525		537,316
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	14,271		24,512
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	703,525		755,298
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [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	3,383		3,383
Available-for-sale securities, Twelve Months or Longer, Fair Value	28,617		28,617
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	3,383		3,383
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	28,617		28,617
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [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	5,232		6,361
Available-for-sale securities, Twelve Months or Longer, Fair Value	97,264		98,275
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	5,232		6,361
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	97,264		98,275
US Treasury Securities [Member]
Debt Securities, Available-for-sale [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	8		12
Available-for-sale securities, Twelve Months or Longer, Fair Value	989		1,984
Available-for-sale securities, Continuous Unrealized Loss Position, Aggregate Losses, Total	8		12
Available-for-sale securities, Continuous Unrealized Loss Position, Fair Value, Total	$ 989		$ 1,984

XML

Investment Securities - Amortized Cost and Fair Value of Investment Securities by Contractual Maturities (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Amortized Cost	$ 10,100
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, within One Year, Fair Value	10,147
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after Five Through Ten Years, Amortized Cost	14,386
Held-to-maturity Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value	14,984
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Amortized Cost	286,379
Debt Securities, Held-to-maturity, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value	305,952
Debt Securities, Held-to-maturity	310,865	$ 302,905
Debt Securities, Held-to-maturity, Fair Value	331,083	298,648
Securities available for sale, Due in one year or less, Amortized Cost	2,296
Securities available for sale, After one year through five years, Amortized Cost	12,036
Securities available for sale, After five years through ten years, Amortized Cost	211,149
Securities available for sale, After ten years, Amortized Cost	479,491
Securities available for sale, Mortgage backed securities, Amortized Cost	2,560,574
Securities available for sale Total, Amortized Cost	3,265,546	3,339,888
Securities available for sale, Due in one year or less, Estimated Fair Value	2,313
Securities available for sale, After one year through five years, Estimated Fair Value	12,206
Securities available for sale, After five years through ten years, Estimated Fair Value	203,258
Securities available for sale, After ten years, Estimated Fair Value	499,788
Securities available for sale, Mortgage backed securities, Estimated Fair Value	2,526,682
Securities available for sale Total, Estimated Fair Value	$ 3,244,247	$ 3,276,988

XML

Investment Securities - Investment Securities by Credit Rating Type (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	$ 310,865	$ 302,905
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247	3,276,988
Investment securities - equity	118,005	115,061
Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	310,865	302,905
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	536,990	538,668
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	1,492,236	1,530,124
Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	99,099	100,106
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	935,347	924,594
US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	38,901	38,188
US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	989	1,984
Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	66,391	63,919
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	28,617	28,617
Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	15,026	15,327
Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	97,042	99,380
CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	51,614	51,142
AAA [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	979,916	953,680
Investment securities - equity	0	0
AAA [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	68,227	66,160
AAA [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	911,689	887,520
AAA [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
AAA [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AAA [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Split-rated AAA/AA Plus [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	1,640,100	1,682,548
Investment securities - equity	25,375	25,375
Split-rated AAA/AA Plus [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	8,875	12,146
Split-rated AAA/AA Plus [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	1,492,236	1,530,124
Split-rated AAA/AA Plus [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	99,099	100,106
Split-rated AAA/AA Plus [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Split-rated AAA/AA Plus [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	38,901	38,188
Split-rated AAA/AA Plus [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	989	1,984
Split-rated AAA/AA Plus [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Split-rated AAA/AA Plus [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Split-rated AAA/AA Plus [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Split-rated AAA/AA Plus [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Split-rated AAA/AA Plus [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	25,375	25,375
AA Plus to AA- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	315,909	340,751
Investment securities - equity	0	0
AA Plus to AA- [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	294,830	306,409
AA Plus to AA- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	21,079	34,342
AA Plus to AA- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
AA Plus to AA- [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
AA Plus to AA- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
A Plus to A- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	227,988	219,188
Investment securities - equity	0	0
A Plus to A- [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	163,391	152,330
A Plus to A- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
A Plus to A- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
A Plus to A- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	297	343
A Plus to A- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
A Plus to A- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
A Plus to A- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
A Plus to A- [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
A Plus to A- [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
A Plus to A- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	64,300	66,515
A Plus to A- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
BBB Plus to BBB- [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	62,257	62,429
Investment securities - equity	47,931	45,771
BBB Plus to BBB- [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BBB Plus to BBB- [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BBB Plus to BBB- [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BBB Plus to BBB- [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	898	947
BBB Plus to BBB- [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BBB Plus to BBB- [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BBB Plus to BBB- [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	47,931	45,771
BBB Plus to BBB- [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	28,617	28,617
BBB Plus to BBB- [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BBB Plus to BBB- [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	32,742	32,865
BBB Plus to BBB- [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
BB Plus and below [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	16,410	16,769
Investment securities - equity	3,925	3,693
BB Plus and below [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	1,384	1,442
BB Plus and below [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	3,925	3,693
BB Plus and below [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	15,026	15,327
BB Plus and below [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
BB Plus and below [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	0	0
Corporate Credit Quality Indicator Unrated [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	1,667	1,623
Investment securities - equity	40,774	40,222
Corporate Credit Quality Indicator Unrated [Member] | Municipal Bonds [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	310,865	302,905
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	1,667	1,623
Corporate Credit Quality Indicator Unrated [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | Commercial Mortgage Backed Securities Issued By US Government Sponsored Enterprise [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | US Government-sponsored Enterprises Debt Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | US Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | Preferred Stock [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	14,535	14,455
Corporate Credit Quality Indicator Unrated [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | Collateralized Debt Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | Corporate Bond Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Corporate Credit Quality Indicator Unrated [Member] | CRA investments [Member]
Debt Securities, Available-for-sale [Line Items]
Investment securities - equity	$ 26,239	$ 25,767

XML

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	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Credit Mark on Acquired Loans	$ 13,100	$ 14,600
Net deferred loan fees and costs	(34,800)	(36,300)
Receivable with Imputed Interest, Discount	8,200	2,000
Loans, net of deferred loan fees and costs	18,116,748	17,710,629
Allowance for credit losses	(154,987)	(152,717)
Loans, net	17,961,761	17,557,912
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	7,723,695	7,762,642
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	4,304,261	4,213,428
Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	2,285,340	2,325,380
Allowance for credit losses	(14,746)	(14,286)
Construction and land development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	2,283,527	2,134,753
Allowance for credit losses	(26,083)	(22,513)
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	1,461,561	1,204,355
Allowance for credit losses	(13,006)	(11,276)
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans, net of deferred loan fees and costs	58,364	70,071
Allowance for credit losses	$ (777)	$ (981)

XML

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	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	$ 18,076,706	$ 17,673,900
Past Due	40,042	36,729
Total	18,116,748	17,710,629
Financing Receivable, Recorded Investment, Nonaccrual Status	43,887	27,746
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	594
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	2,281,389	2,320,321
Past Due	3,951	5,059
Total	2,285,340	2,325,380
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	594
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	4,143,704	4,051,837
Past Due	984	0
Total	4,144,688	4,051,837
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	159,573	161,591
Past Due	0	0
Total	159,573	161,591
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	7,711,923	7,753,111
Past Due	11,772	9,531
Total	7,723,695	7,762,642
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,497,960	1,382,664
Past Due	0	0
Total	1,497,960	1,382,664
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	784,146	751,613
Past Due	1,421	476
Total	785,567	752,089
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,439,763	1,182,933
Past Due	21,798	21,422
Total	1,461,561	1,204,355
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	58,248	69,830
Past Due	116	241
Total	58,364	70,071
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0	0
Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	24,333	8,191
Past Due	19,554	19,555
Financing Receivable, Recorded Investment, Nonaccrual Status	43,887	27,746
Non-accrual loans [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	420	0
Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	420	0
Non-accrual loans [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
Past Due	580	0
Financing Receivable, Recorded Investment, Nonaccrual Status	580	0
Non-accrual loans [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
Past Due	0	0
Financing Receivable, Recorded Investment, Nonaccrual Status	0	0
Non-accrual loans [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	19,438	7,639
Past Due	11,636	7,451
Financing Receivable, Recorded Investment, Nonaccrual Status	31,074	15,090
Non-accrual loans [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	3,307	0
Past Due	0	476
Financing Receivable, Recorded Investment, Nonaccrual Status	3,307	476
Non-accrual loans [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
Past Due	476	0
Financing Receivable, Recorded Investment, Nonaccrual Status	476	0
Non-accrual loans [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	1,168	552
Past Due	6,746	11,387
Financing Receivable, Recorded Investment, Nonaccrual Status	7,914	11,939
Non-accrual loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Current	0	0
Past Due	116	241
Financing Receivable, Recorded Investment, Nonaccrual Status	116	241
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	18,412	16,944
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,630	4,441
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]
Past Due	984	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	193	3,187
Financing Receivables, 30 to 59 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
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]
Past Due	945	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	13,660	9,316
Financing Receivables, 30 to 59 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	14,695	4,902
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	1,321	0
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]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	10,638	416
Financing Receivables, 60 to 89 Days Past Due [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
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]
Past Due	0	476
Financing Receivables, 60 to 89 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	2,736	4,010
Financing Receivables, 60 to 89 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	6,935	14,883
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]
Past Due	0	618
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]
Past Due	0	0
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]
Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	941	5,928
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]
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]
Past Due	476	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	5,402	8,096
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Past Due	$ 116	$ 241

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	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 40,042	$ 36,729
Total Non-accrual	43,887	27,746
Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,772	9,531
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,951	5,059
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	984	0
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,421	476
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	21,798	21,422
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	116	241
Non-accrual loans [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,554	19,555
Total Non-accrual	43,887	27,746
Non-accrual loans [Member] | Commercial and industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	11,636	7,451
Total Non-accrual	31,074	15,090
Non-accrual loans [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Total Non-accrual	420	0
Non-accrual loans [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	580	0
Total Non-accrual	580	0
Non-accrual loans [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Total Non-accrual	0	0
Non-accrual loans [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	476
Total Non-accrual	3,307	476
Non-accrual loans [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	476	0
Total Non-accrual	476	0
Non-accrual loans [Member] | Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,746	11,387
Total Non-accrual	7,914	11,939
Non-accrual loans [Member] | Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	116	241
Total Non-accrual	$ 116	$ 241

XML

Loans, Leases and Allowance for Credit Losses - Additional Information (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) SecurityLoan	Mar. 31, 2018 USD ($) SecurityLoan	Dec. 31, 2018 USD ($)
Leases [Line Items]
Loans and Leases Receivable, Deferred Income	$ 34,800		$ 36,300
Receivable with Imputed Interest, Discount	8,200		2,000
Interest Rate and Credit Marks on Acquired Loans	6,100		7,100
Credit Mark on Acquired Loans	13,100		14,600
Reduction in interest income due to nonaccrual loans	300	$ 600
Aggregate carrying amount of impaired loans	5,244		986
Impaired loans with no allowance recorded	138,154		111,266
Impaired loans with an allowance recorded	1,357		681
Impaired Financing Receivable, Average Recorded Investment	126,613	$ 93,081
Financing Receivable, Recorded Investment, Nonaccrual Status	43,887		27,746
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	0		594
Financing Receivable, Net	$ 18,116,748		17,710,629
Financing Receivable, Modifications, Number of Contracts | SecurityLoan	2	5
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 27,100	$ 15,000
Financing Receivable, Modifications, Subsequent Default, Number of Contracts | SecurityLoan	0
Loans And Loans Receivable Purchases	$ 530,500	141,500
Financing Receivable, Significant Sales	15,500	31,000
Loans and Leases Receivable, Gain (Loss) on Sales, Net	(400)	700
Troubled Debt Restructured Loans [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans	0
Impaired loans with no allowance recorded	68,900		44,500
Impaired Financing Receivable, Average Recorded Investment	51,600	48,300
Financing Receivable, Recorded Investment, Nonaccrual Status	16,400		8,000
Loan commitments outstanding	2,100		1,500
Non-owner occupied [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans	0		0
Impaired loans with no allowance recorded	12,268		12,407
Impaired loans with an allowance recorded	0		0
Loans And Loans Receivable Purchases	30,000
Construction and land development [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans	3,307		0
Impaired loans with no allowance recorded	25,308		9,403
Impaired loans with an allowance recorded	810		0
Residential real estate [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans	1,347		363
Impaired loans with no allowance recorded	14,070		19,381
Impaired loans with an allowance recorded	250		60
Loans And Loans Receivable Purchases	312,500	23,200
Commercial and industrial [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans	590		623
Impaired loans with no allowance recorded	78,178		63,273
Impaired loans with an allowance recorded	297		621
Loans And Loans Receivable Purchases	188,000	118,300
Consumer [Member]
Leases [Line Items]
Aggregate carrying amount of impaired loans	0		0
Impaired loans with no allowance recorded	145		272
Impaired loans with an allowance recorded	0		0
Non-owner occupied [Member] | Commercial real estate [Member]
Leases [Line Items]
Impaired Financing Receivable, Average Recorded Investment	12,311	$ 18,925
Financing Receivable, Net	4,144,688		4,051,837
Financial Asset Acquired with Credit Deterioration [Member]
Leases [Line Items]
Impaired loans with an allowance recorded	109		96
Financial Asset Acquired with Credit Deterioration [Member] | Non-owner occupied [Member]
Leases [Line Items]
Impaired loans with an allowance recorded	101		87
Financial Asset Acquired with Credit Deterioration [Member] | Construction and land development [Member]
Leases [Line Items]
Impaired loans with an allowance recorded	0		0
Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Leases [Line Items]
Impaired loans with an allowance recorded	0		0
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Leases [Line Items]
Impaired loans with an allowance recorded	8		9
Financial Asset Acquired with Credit Deterioration [Member] | Consumer [Member]
Leases [Line Items]
Impaired loans with an allowance recorded	$ 0		$ 0

XML

Loans, Leases and Allowance for Credit Losses - Loans by Risk Rating (Detail) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	$ 18,116,748,000	$ 17,710,629,000
Current	18,076,706,000	17,673,900,000
Past Due	40,042,000	36,729,000
Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	7,723,695,000	7,762,642,000
Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	1,461,561,000	1,204,355,000
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	58,364,000	70,071,000
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	2,285,340,000	2,325,380,000
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	4,144,688,000	4,051,837,000
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	159,573,000	161,591,000
Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	1,497,960,000	1,382,664,000
Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	785,567,000	752,089,000
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	17,776,893,000	17,412,922,000
Current	17,760,118,000	17,400,616,000
Pass [Member] | Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	7,548,610,000	7,574,506,000
Pass [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	1,452,919,000	1,191,571,000
Pass [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	58,208,000	69,755,000
Pass [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	2,206,311,000	2,255,513,000
Pass [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	4,095,492,000	4,030,350,000
Pass [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	159,573,000	161,591,000
Pass [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	1,470,710,000	1,378,624,000
Pass [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	785,070,000	751,012,000
Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	134,348,000	88,856,000
Current	134,268,000	87,264,000
Watch [Member] | Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	70,708,000	61,202,000
Watch [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	365,000	527,000
Watch [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	29,000	75,000
Watch [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	23,044,000	12,860,000
Watch [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	36,114,000	12,982,000
Watch [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Watch [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	4,088,000	1,210,000
Watch [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	204,958,000	208,273,000
Current	181,862,000	186,020,000
Substandard [Member] | Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	103,828,000	126,356,000
Substandard [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	8,277,000	12,257,000
Substandard [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	127,000	241,000
Substandard [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	55,985,000	57,007,000
Substandard [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	13,082,000	8,505,000
Substandard [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Substandard [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	23,162,000	2,830,000
Substandard [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	497,000	1,077,000
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	549,000	578,000
Current	458,000	0
Doubtful [Member] | Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	549,000	578,000
Doubtful [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Doubtful [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Current	0	0
Loss [Member] | Commercial and industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Residential real estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Construction and land development [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Loss [Member] | Construction and land development [Member] | Land [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Net	0	0
Financing Receivables, 30 to 59 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	18,412,000	16,944,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	14,947,000	11,255,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	35,000	1,580,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	3,339,000	4,109,000
Financing Receivables, 30 to 59 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	91,000	0
Financing Receivables, 30 to 59 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	0	0
Financing Receivables, 60 to 89 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	14,695,000	4,902,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	1,494,000	719,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	45,000	12,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	13,156,000	3,767,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	0	404,000
Financing Receivables, 60 to 89 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	6,935,000	14,883,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	334,000	332,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Watch [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	0	0
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Substandard [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	6,601,000	14,377,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	0	174,000
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Loss [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Past Due	$ 0	$ 0

XML

Loans, Leases and Allowance for Credit Losses - Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	$ 143,398	$ 112,252
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	78,768	63,896
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	15,417	19,744
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	145	272
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	8,185	6,530
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	12,268	12,407
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	78,768	63,896
Construction and land development [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	20,329	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Impaired [Line Items]
Total impaired loans by class	$ 8,286	$ 9,403

XML

Loans, Leases and Allowance for Credit Losses - Recorded Investment in Loans Classified as Impaired (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Receivables [Abstract]
Impaired loans with an allowance recorded	$ 5,244	$ 986
Impaired loans with no allowance recorded	138,154	111,266
Total impaired loans	143,398	112,252
Valuation allowance related to impaired loans	$ (1,357)	$ (681)

XML

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
	Mar. 31, 2019	Mar. 31, 2018
Receivables [Abstract]
Impaired Financing Receivable, Average Recorded Investment	$ 126,613	$ 93,081
Interest income recognized on impaired loans	1,493	873
Interest recognized on nonaccrual loans, cash basis	$ 309	$ 438

XML

Loans, Leases and Allowance for Credit Losses - Average Investment in Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	$ 126,613	$ 93,081
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	67,144	36,849
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	18,278	17,799
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	228	184
Commercial real estate [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	7,569	9,043
Commercial real estate [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	12,311	18,925
Commercial real estate [Member] | Multi-family [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	0	0
Construction and land development [Member] | Construction [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	12,451	0
Construction and land development [Member] | Land [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	8,632	10,281
Troubled Debt Restructured Loans [Member]
Financing Receivable, Impaired [Line Items]
Total average investment in impaired loans by loan class	$ 51,600	$ 48,300

XML

Loans, Leases and Allowance for Credit Losses - Interest Income on Impaired Loans by Loan Class (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	$ 1,493	$ 873
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	769	250
Owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	123	127
Non-owner occupied [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	187	262
Multi-family [Member] | Commercial real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	0	0
Construction [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	180	0
Land [Member] | Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	129	130
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	105	104
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Total interest income on impaired loans by class	$ 0	$ 0

XML

Loans, Leases and Allowance for Credit Losses - Tabular Disclosure of Nonperforming Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 43,887	$ 27,746
Loans past due 90 days or more on accrual status	0	594
Troubled debt restructured loans	52,488	36,458
Total nonperforming loans	96,375	64,798
Other assets acquired through foreclosure, net	17,707	17,924	$ 30,194	$ 28,540
Total nonperforming assets	114,082	82,722
Troubled Debt Restructured Loans [Member]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 16,400	$ 8,000

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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
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Reclassifications from non-accretable to accretable yield (1)	$ 0
Accretion to interest income	(161)	$ (313)
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance at beginning of period	3,768	9,324
Reclassifications from non-accretable to accretable yield (1)		683
Reversal of fair value adjustments upon disposition of loans	(470)	(1,586)
Balance at end of period	$ 3,137	$ 8,108

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Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Valuation Allowance [Line Items]
Beginning Balance	$ 152,717	$ 140,050
Charge-offs	2,313	3,624
Recoveries	(1,083)	(2,233)
Provision for credit losses	3,500	6,000
Ending balance	154,987	144,659
Construction and land development [Member]
Valuation Allowance [Line Items]
Beginning Balance	22,513	19,511
Charge-offs	0	0
Recoveries	(55)	(1,388)
Provision for credit losses	3,515	1,695
Ending balance	26,083	22,594
Commercial real estate [Member]
Valuation Allowance [Line Items]
Beginning Balance	34,829	31,495
Charge-offs	0	0
Recoveries	(453)	(126)
Provision for credit losses	2,585	1,247
Ending balance	37,867	32,868
Residential real estate [Member]
Valuation Allowance [Line Items]
Beginning Balance	11,276	5,478
Charge-offs	188	107
Recoveries	(93)	(250)
Provision for credit losses	1,825	(102)
Ending balance	13,006	5,519
Commercial and industrial [Member]
Valuation Allowance [Line Items]
Beginning Balance	83,118	82,793
Charge-offs	2,124	3,517
Recoveries	(477)	(459)
Provision for credit losses	(4,217)	3,143
Ending balance	77,254	82,878
Consumer [Member]
Valuation Allowance [Line Items]
Beginning Balance	981	773
Charge-offs	1	0
Recoveries	(5)	(10)
Provision for credit losses	(208)	17
Ending balance	$ 777	$ 800

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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	Mar. 31, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	$ 5,244	$ 986
Impaired loans with no allowance recorded	138,154	111,266
Total loans individually evaluated for impairment	143,398	112,252
Loans collectively evaluated for impairment	17,910,128	17,514,822
Impaired Financing Receivable, Recorded Investment	143,398	112,252
Total recorded investment	18,116,748	17,710,629
Impaired loans with an allowance recorded	6,117	1,845
Impaired loans with no allowance recorded	220,177	198,234
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	226,294	200,079
Loans collectively evaluated for impairment	17,910,128	17,514,822
Financing Receivable Unpaid Principal Balance	18,220,551	17,820,320
Impaired loans with an allowance recorded	1,357	681
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	1,357	681
Loans collectively evaluated for impairment	153,521	151,940
Total loans held for investment	154,987	152,717
Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	8,185	6,530
Total loans individually evaluated for impairment	8,185	6,530
Loans collectively evaluated for impairment	2,273,235	2,314,871
Total recorded investment	2,285,340	2,325,380
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	13,479	11,852
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	13,479	11,852
Loans collectively evaluated for impairment	2,273,235	2,314,871
Financing Receivable Unpaid Principal Balance	2,291,971	2,332,038
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	14,746	14,286
Total loans held for investment	14,746	14,286
Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	12,268	12,407
Total loans individually evaluated for impairment	12,268	12,407
Loans collectively evaluated for impairment	4,232,710	4,121,464
Total recorded investment	4,304,261	4,213,428
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	14,398	18,155
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	14,398	18,155
Loans collectively evaluated for impairment	4,232,710	4,121,464
Financing Receivable Unpaid Principal Balance	4,321,561	4,235,299
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	23,020	20,456
Total loans held for investment	23,121	20,543
Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	590	623
Impaired loans with no allowance recorded	78,178	63,273
Total loans individually evaluated for impairment	78,768	63,896
Loans collectively evaluated for impairment	7,644,927	7,698,746
Total recorded investment	7,723,695	7,762,642
Impaired loans with an allowance recorded	1,463	1,482
Impaired loans with no allowance recorded	117,839	103,992
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	119,302	105,474
Loans collectively evaluated for impairment	7,644,927	7,698,746
Financing Receivable Unpaid Principal Balance	7,768,576	7,808,572
Impaired loans with an allowance recorded	297	621
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	297	621
Loans collectively evaluated for impairment	76,949	82,488
Total loans held for investment	77,254	83,118
Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	1,347	363
Impaired loans with no allowance recorded	14,070	19,381
Total loans individually evaluated for impairment	15,417	19,744
Loans collectively evaluated for impairment	1,446,125	1,184,592
Total recorded investment	1,461,561	1,204,355
Impaired loans with an allowance recorded	1,347	363
Impaired loans with no allowance recorded	22,428	27,979
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	23,775	28,342
Loans collectively evaluated for impairment	1,446,125	1,184,592
Financing Receivable Unpaid Principal Balance	1,469,972	1,213,006
Impaired loans with an allowance recorded	250	60
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	250	60
Loans collectively evaluated for impairment	12,756	11,216
Total loans held for investment	13,006	11,276
Construction and land development [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	3,307	0
Impaired loans with no allowance recorded	25,308	9,403
Total loans individually evaluated for impairment	28,615	9,403
Loans collectively evaluated for impairment	2,254,912	2,125,350
Total recorded investment	2,283,527	2,134,753
Impaired loans with an allowance recorded	3,307	0
Impaired loans with no allowance recorded	41,528	25,624
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	44,835	25,624
Loans collectively evaluated for impairment	2,254,912	2,125,350
Financing Receivable Unpaid Principal Balance	2,299,747	2,150,974
Impaired loans with an allowance recorded	810	0
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	810	0
Loans collectively evaluated for impairment	25,273	22,513
Total loans held for investment	26,083	22,513
Consumer [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	145	272
Total loans individually evaluated for impairment	145	272
Loans collectively evaluated for impairment	58,219	69,799
Total recorded investment	58,364	70,071
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	10,505	10,632
Impaired Financing Receivable Unpaid Principal Balance Individually Evaluated For Impairment	10,505	10,632
Loans collectively evaluated for impairment	58,219	69,799
Financing Receivable Unpaid Principal Balance	68,724	80,431
Impaired loans with an allowance recorded	0	0
Impaired loans with no allowance recorded	0	0
Total loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	777	981
Total loans held for investment	777	981
Financial Asset Acquired with Credit Deterioration [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	63,222	83,555
Loans acquired with deteriorated credit quality	84,129	105,419
Impaired loans with an allowance recorded	109	96
Financial Asset Acquired with Credit Deterioration [Member] | Owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	3,920	3,979
Loans acquired with deteriorated credit quality	5,257	5,315
Impaired loans with an allowance recorded	0	0
Financial Asset Acquired with Credit Deterioration [Member] | Non-owner occupied [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	59,283	79,557
Loans acquired with deteriorated credit quality	74,453	95,680
Impaired loans with an allowance recorded	101	87
Financial Asset Acquired with Credit Deterioration [Member] | Commercial and industrial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	0	0
Loans acquired with deteriorated credit quality	4,347	4,352
Impaired loans with an allowance recorded	8	9
Financial Asset Acquired with Credit Deterioration [Member] | Residential real estate [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, Recorded Investment	19	19
Loans acquired with deteriorated credit quality	72	72
Impaired loans with an allowance recorded	0	0
Financial Asset Acquired with Credit Deterioration [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
Financial Asset Acquired with Credit Deterioration [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

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Leases (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 72,841,000		$ 0
Lessee, Operating Lease, Discount Rate	3.06%
Operating Lease, Weighted Average Remaining Lease Term	9 years 11 days
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 9,099,000
Operating Leases, Future Minimum Payments, Due in Two Years	11,200,000
Operating Leases, Future Minimum Payments, Due in Three Years	9,186,000
Operating Leases, Future Minimum Payments, Due in Four Years	7,992,000
Operating Leases, Future Minimum Payments, Due in Five Years	8,002,000
Operating Leases, Future Minimum Payments, Due Thereafter	45,503,000
Operating Leases, Future Minimum Payments Due	90,982,000
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	13,232,000
Operating Lease, Liability	77,750,000		0
Lessee, operating lease, leases not yet commenced, aggregated commitment	5,000,000
Lease, Cost	3,251,000	$ 2,500,000
Lessee, operating lease, other cost	$ 1,072,000
Operating Leases, Future Minimum Payments Due, Next Twelve Months			11,000
Operating Leases, Future Minimum Payments, Due in Two Years			10,000
Operating Leases, Future Minimum Payments, Due in Three Years			7,000
Operating Leases, Future Minimum Payments, Due in Four Years			6,000
Operating Leases, Future Minimum Payments, Due in Five Years			6,000
Operating Leases, Future Minimum Payments, Due Thereafter			15,000
Operating Leases, Future Minimum Payments Due			$ 57,000

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Other Assets Acquired through Foreclosure - Changes in Other Assets Acquired through Foreclosure (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) Property	Mar. 31, 2018 USD ($) Property	Dec. 31, 2018 Property
Real Estate Properties [Line Items]
Balance, beginning of the period, Gross Balance	$ 19,979	$ 32,552
Real estate donated, gross	(232)
Valuation allowance related to donated real estate	114
Real estate donated, net	118
Real Estate Owned, Valuation Allowance, Amounts Applied		9
Transfers to other assets acquired through foreclosure, net, Gross Balance	0	5,744
Proceeds From Sale Of Other Real Estate Owned Gross		(5,294)
Proceeds from sale of other real estate owned and repossessed assets, net, Gross Balance	0	5,285
Gains (losses), net, Gross Balance		1,242
Balance, end of period, Gross Balance	19,747	34,244
Balance, beginning of the period, Valuation Allowance	(2,055)	(4,012)
Balance, end of period, Valuation Allowance	(2,040)	(4,050)
Balance, beginning of the period, Net Balance	17,924	28,540
Valuation adjustments of other repossessed assets, net	(99)	(47)
Gains (losses), net, Net Balance		1,242
Balance, end of period, Net Balance	17,707	30,194
Gains Losses On Transfers To Other Real Estate And Foreclosed Assets	$ 0	$ 1,000
Number of Real Estate Properties | Property	10	18	11

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Other Borrowings - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Debt [Line Items]
FHLB advances	$ 235,000,000	$ 0
Short-term Debt	491,000,000	0
Revolving line of credit	$ 0
Weighted average interest rate of FHLB and FRB Short-term advances	2.56%
Customer repurchase agreements	$ 22,411,000	15,141,000
Federal Funds Purchased	256,000,000	0
Federal Home Loan Bank Advances [Member]
Debt [Line Items]
Additional available credit with the entity	2,520,000,000	2,970,000,000
FRB [Member]
Debt [Line Items]
Additional available credit with the entity	$ 1,310,000,000	1,320,000,000
Unsecured Credit Facility [Member]
Debt [Line Items]
Secured borrowing credit line		$ 955,000,000

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Qualifying Debt (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) Trust	Dec. 31, 2018 USD ($)	Jun. 16, 2016 USD ($)	Jun. 29, 2015 USD ($)
Debt Instrument [Line Items]
Subordinated Debt	$ 305,000,000	$ 299,400,000
Number of Statutory Business Trusts Formed or Acquired | Trust	8
Junior Subordinated Debenture Owed to Unconsolidated Subsidiary Trust	$ 69,000,000	$ 61,100,000
Subordinated Debt [Member] | Subordinated Debentures Maturing July 2056 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 175,000,000.0
Debt Issuance Cost			$ 5,500,000
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Subordinated Debt [Member] | Subordinated Debentures Maturing July 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 150,000,000.0
Debt Issuance Cost				$ 1,800,000
Debt Instrument, Interest Rate, Stated Percentage	0.00%
Junior Subordinated Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Weighted Average Interest Rate, at Point in Time	4.94%	5.15%

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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Treasury Stock, Shares, Acquired	173,007	180,867
Treasury Stock Acquired, Average Cost Per Share	$ 0	$ 59.02
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 1.7	$ 1.6
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Granted, Value, Share-based Compensation, Gross	20.7	21.9
Allocated Share-based Compensation Expense	4.3
Executive Officer [Member] | Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated Share-based Compensation Expense	$ 0.5	$ 0.6

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Stockholders' Equity Common Stock Repurchase (Details) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchase Program, Authorized Amount | $	$ 250,000
Stock Repurchased and Retired During Period, Shares | shares	941
Stock Repurchased and Retired During Period, Value | $	$ 37,949
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Repurchased and Retired During Period, Shares | shares	(941)

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Accumulated Other Comprehensive Income - Summary of Changes in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (33,622)	$ (3,145)
Other comprehensive income before reclassifications	25,431	(37,459)
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income (loss)	25,431	(37,459)
Ending balance	(8,191)	(41,662)
Unrealized holding gains (losses) on AFS
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(47,591)	(10,026)
Other comprehensive income before reclassifications	31,377	(38,914)
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income (loss)	31,377	(38,914)
Ending balance	(16,214)	(51,470)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	13,433	6,352
Other comprehensive income before reclassifications	(5,928)	1,466
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income (loss)	(5,928)	1,466
Ending balance	7,505	9,206
Impairment loss on securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	144	144
Other comprehensive income before reclassifications	0	0
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income (loss)	0	0
Ending balance	144	144
Supplemental Employee Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	392	385
Other comprehensive income before reclassifications	(18)	(11)
Amounts reclassified from accumulated other comprehensive income	0	0
Net other comprehensive income (loss)	(18)	(11)
Ending balance	$ 374	$ 458

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Accumulated Other Comprehensive Income - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount reclassified from accumulated other comprehensive income	$ 0	$ 0

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Derivatives and Hedging Fair Value of Derivative Contracts (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Other Derivatives Not Designated as Hedging Instruments at Fair Value, Net	$ 200	$ 300
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	44,461	52,068	$ 127,695
Derivative Liability, Fair Value	523	228	1,564
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	727	481	1,854
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	2,348	2,378	36,840
Derivative Liability, Fair Value	12	27	1,170
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	12	27	1,170
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	42,113	49,690	90,855
Derivative Liability, Fair Value	511	201	394
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value	715	454	684
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	961,493	965,705	989,379
Derivative Asset, Fair Value	987	2,162	3,533
Derivative Liability, Fair Value	48,332	44,892	42,789
Notional Amount, Netting Adjustments	0	0	0
Derivative Netting Adjustments	987	2,162	3,493
Positive NPVs	0	0	40
Negative NPVs	47,345	42,730	39,296
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Derivatives, Fair Value [Line Items]
Notional Amount	961,493	965,705	989,379
Derivative Asset, Fair Value	987	2,162	3,533
Derivative Liability, Fair Value	$ 48,332	$ 44,892	$ 42,789

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Derivatives and Hedging Largest Exposure to Individual Counterparty (Detail) - Largest individual counterparty [Member] - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Largest gross exposure (positive derivative NPV) to an individual counterparty	$ 987	$ 1,411	$ 2,515
Collateral posted by this counterparty	0	0	0
Negative derivative NPV with this counterparty	32,250	23,906	20,624
Collateral pledged to this counterparty	40,035	25,761	29,719
Net exposure after netting adjustments and collateral	$ 0	$ 0	$ 0

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Derivatives and Hedging Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 1,200,000	$ 500,000
Collateral netted against derivative liabilities	48,300,000	40,100,000	$ 44,900,000
Over collateralization net position	14,200,000	$ 12,100,000	7,600,000
Additional collateral held in securities	62,500,000
Derivative, Amount of Hedged Item, Loans	656,346,000		650,428,000
Fair Value Hedge Assets, Loans	33,123,000		23,039,000
Derivative, Amount of Hedged Item	(305,002,000)		(299,401,000)
Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease)	14,222,000		$ 19,691,000
Subordinated Debentures Maturing July 2025 [Member] | Subordinated Debt [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	150,000,000.0
Subordinated Debentures Maturing July 2056 [Member] | Subordinated Debt [Member]
Derivative [Line Items]
Debt Instrument, Face Amount	$ 175,000,000.0

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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Basic	104,033	104,530
Dilutive Effect Of Stock Options Restricted Stock And Equity Settled Awards	442	794
Diluted	104,475	105,324
Net income available to common shareholders	$ 120,796	$ 100,900
Earnings (loss) per share - basic	$ 1.16	$ 0.97
Earnings (loss) per share - diluted	$ 1.16	$ 0.96
Anti-dilutive stock options outstanding that were not included in computation of diluted earnings per common share	0

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Income Taxes Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate Reconciliation, Percent	17.45%	17.10%
Deferred tax assets, net	$ 22,309		$ 31,990
Increase (Decrease) in Deferred Income Taxes	(9,700)
Operating Loss Carryforwards, Valuation Allowance	2,400		2,373
Amortization Method Qualified Affordable Housing Project Investments	331,972		342,381
Affordable Housing Program Obligation	147,300		$ 171,700
Amortization of tax credit investments	10,145	$ 8,128
Internal Revenue Service (IRS) [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards	47,400
Deferred Tax Assets, Operating Loss Carryforwards	5,800
ARIZONA
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Amount	5,000
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Deferred Tax Assets, Operating Loss Carryforwards, State and Local	$ 300

XML

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Loss Contingencies [Line Items]
Letters of credit expiration period	1 year
Percentage of first liens initial loan to value ratio	75.00%
Percentage Of Commercial Real Estate Loans Occupied By Owners	35.00%		35.60%
Commercial Real Estate Portfolio Segment [Member] | Loans Receivable [Member] | Credit Concentration Risk [Member]
Loss Contingencies [Line Items]
Percent of commercial real estate related loans	49.00%	49.00%
Unfunded Loan Commitment [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual	$ 9.2		$ 8.2

XML

Commitments and Contingencies - Summary of Contractual Amounts for Unfunded Commitments and Letters of Credit (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Other Commitments [Line Items]
Total amount	$ 8,711,447		$ 8,184,214
Percentage Of Commercial Real Estate Loans Occupied By Owners	35.00%		35.60%
Commitments to extend credit [Member]
Other Commitments [Line Items]
Unsecured Loan Commitments	$ 864,740		$ 770,114
Total amount	8,197,452		7,556,741
Credit card guarantees [Member]
Other Commitments [Line Items]
Total amount	251,675		237,312
Standby letters of credit [Member]
Other Commitments [Line Items]
Total amount	262,320		390,161
Unsecured Letters Of Credit	$ 16,336		$ 21,879
Commercial Real Estate Portfolio Segment [Member] | Credit Concentration Risk [Member] | Loans Receivable [Member]
Other Commitments [Line Items]
Concentration Risk, Percentage	49.00%	49.00%

XML

Fair Value Accounting - Gains and Losses from Fair Value Changes Included in Consolidated Statement of Operations (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure	$ 56,546		$ 48,684
Unrealized (loss) gain on junior subordinated debt, net of tax effect of $1,934 and $(478), respectively	$ (5,928)	$ 1,466
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Instrument, Measurement Input	0.06645		0.07820
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (7,862)	$ 1,944
Period of basis point spread	4.05%	5.01%
Percentage of LIBOR	2.60%	2.81%

XML

Fair Value Accounting - Fair Value of Assets and Liabilities (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	$ 3,244,247		$ 3,276,988
Investment securities - equity	118,005		115,061
Subordinated Debt Obligations, Fair Value Disclosure	56,546		48,684
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	3,244,247		3,276,988
Investment securities - equity	118,005		115,061
Derivative Liability	48,855		45,120
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	5,142		0
Investment securities - equity	118,005		115,061
Subordinated Debt Obligations, Fair Value Disclosure	0		0
Derivative Liability	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	3,239,105		3,276,988
Investment securities - equity	0		0
Subordinated Debt Obligations, Fair Value Disclosure	0		0
Derivative Liability	48,855		45,120
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	0		0
Investment securities - equity	0		0
Subordinated Debt Obligations, Fair Value Disclosure	56,546		48,684
Derivative Liability	0		0
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,492,236		1,530,124
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [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] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	1,492,236		1,530,124
Fair Value, Measurements, Recurring [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [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] | Residential Mortgage Backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	935,347		924,594
Fair Value, Measurements, Recurring [Member] | 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	0		0
Fair Value, Measurements, Recurring [Member] | 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	935,347		924,594
Fair Value, Measurements, Recurring [Member] | 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	99,099		100,106
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	0		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	99,099		100,106
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 Bond Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	97,042		99,380
Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	5,142		0
Fair Value, Measurements, Recurring [Member] | Corporate Bond Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	91,900		99,380
Fair Value, Measurements, Recurring [Member] | Corporate Bond 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 Bonds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	536,990		538,668
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [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] | Municipal Bonds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	536,990		538,668
Fair Value, Measurements, Recurring [Member] | Municipal Bonds [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			63,919
Investment securities - equity	66,391
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			63,919
Investment securities - equity	66,391
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
Investment securities - equity	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
Investment securities - equity	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			51,142
Investment securities - equity	51,614
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			51,142
Investment securities - equity	51,614
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
Investment securities - equity	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
Investment securities - equity	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	15,026		15,327
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	15,026		15,327
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	0		0
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities Subject to Mandatory Redemption [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	28,617		28,617
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities Subject to Mandatory Redemption [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 Subject to Mandatory Redemption [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale	28,617		28,617
Fair Value, Measurements, Recurring [Member] | Trust Preferred Securities Subject to Mandatory Redemption [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	38,901		38,188
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	0		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	38,901		38,188
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	989		1,984
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	0		0
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	989		1,984
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		0
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings Fair Value Disclosure			491,000
Securities available for sale	3,244,247		3,276,988
Investment securities - equity	118,005		115,061
Derivative Liability	48,855		45,120
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings Fair Value Disclosure			491,000
Securities available for sale	3,244,247		3,276,988
Investment securities - equity	118,005		115,061
Derivative Liability	48,855		45,120
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings Fair Value Disclosure			0
Securities available for sale	5,142		0
Investment securities - equity	118,005		115,061
Derivative Liability	0		0
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings Fair Value Disclosure			491,000
Securities available for sale	3,239,105		3,276,988
Investment securities - equity	0		0
Derivative Liability	48,855		45,120
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other Borrowings Fair Value Disclosure			0
Securities available for sale	0		0
Investment securities - equity	0		0
Derivative Liability	0		0
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(7,862)	$ 1,944
Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Subordinated Debt Obligations, Fair Value Disclosure	$ 56,546		$ 48,684

XML

Fair Value Accounting - Change in Level 3 Liabilities Measured at Fair Value on Recurring Basis (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (loss) gain on junior subordinated debt, net of tax effect of $1,934 and $(478), respectively	$ (5,928)		$ 1,466
Junior subordinated debt	56,546	$ 48,684
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt	$ 56,546	$ 48,684
Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discounted cash flow method	Discounted cash flow method
Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Collateral method	Collateral method
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	$ (7,862)		$ 1,944
Debt Instrument, Measurement Input	0.06645	0.07820
Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Junior subordinated debt	$ 56,546	$ 48,684
Fair Value Measurements, Valuation Processes, Description	Implied credit rating of the Company		Implied credit rating of the Company
Junior Subordinated Debt [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ (48,684)		$ 56,234
Closing balance	$ (56,546)	$ (48,684)	$ (54,290)
Valuation Technique, Discounted Cash Flow [Member] | Junior Subordinated Debt [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discounted cash flow		Discounted cash flow
Collateral Method [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Collateral method	Collateral method
Third Party Appraisal [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Third party appraisal	Third party appraisal
Third Party Appraisal [Member] | Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Third party appraisal	Third party appraisal
Discount Rate [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discount rate	Discount rate
Scheduled Cash Collections [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Scheduled cash collections	Scheduled cash collections
Proceeds from Non-Real Estate Collateral [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Proceeds from non-real estate collateral	Proceeds from non-real estate collateral

XML

Fair Value Accounting - Assets Measured at Fair Value on Nonrecurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans without specific valuation allowance	$ 138,154	$ 111,266
Other assets acquired through foreclosure	17,707	17,924	$ 30,194	$ 28,540
Impaired Financing Receivables, With No related Allowance, Balances with Charge-offs	15,400	19,400
Impaired Financing Receivable, Recorded Investment	143,398	112,252
Impaired loans with an allowance recorded	5,244	986
Impaired loans with an allowance recorded	1,357	681
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans with an allowance recorded	1,400	700
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans without specific valuation allowance	122,723	91,821
Other assets acquired through foreclosure	17,707	17,924
Impaired loans with an allowance recorded	3,887	305
Fair Value, Measurements, Nonrecurring [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired loans without specific valuation allowance	0	0
Other assets acquired through foreclosure	0	0
Impaired loans with an allowance recorded	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 without specific valuation allowance	0	0
Other assets acquired through foreclosure	0	0
Impaired loans with an allowance recorded	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 without specific valuation allowance	122,723	91,821
Other assets acquired through foreclosure	17,707	17,924
Impaired Financing Receivable, Recorded Investment	126,610	92,126
Impaired loans with an allowance recorded	$ 3,887	$ 305
Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discounted cash flow method	Discounted cash flow method
Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Collateral method	Collateral method
Collateral Method [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Collateral method	Collateral method
Third Party Appraisal [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Third party appraisal	Third party appraisal
Level 3 Fair Value Measurement Inputs	Costs to sell	Costs to sell
Third Party Appraisal [Member] | Other Assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Third party appraisal	Third party appraisal
Level 3 Fair Value Measurement Inputs	Costs to sell	Costs to sell
Discount Rate [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Discount rate	Discount rate
Level 3 Fair Value Measurement Inputs	Contractual loan rate	Contractual loan rate
Scheduled Cash Collections [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Scheduled cash collections	Scheduled cash collections
Level 3 Fair Value Measurement Inputs	Probability of default	Probability of default
Proceeds from Non-Real Estate Collateral [Member] | Loans and Finance Receivables [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurements, Valuation Processes, Description	Proceeds from non-real estate collateral	Proceeds from non-real estate collateral
Level 3 Fair Value Measurement Inputs	Loss given default	Loss given default

XML

Fair Value Accounting - Estimated Fair Value of Financial Instruments (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Sold	$ 290,000	$ 0
Impaired Financing Receivable, Recorded Investment	143,398	112,252
Other Repossessed Assets	17,700	17,900
Financial assets
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	310,865	302,905
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247	3,276,988
Investment securities - equity	118,005	115,061
Loans, net	17,961,761	17,557,912
Financial liabilities
Deposits	20,208,740	19,177,447
Customer repurchase agreements	15,141	22,411
Junior subordinated debt	56,546	48,684
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	126,610	92,126
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Financial assets
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	310,865	302,905
Loans, net	17,961,761	17,557,912
Financial liabilities
Deposits	20,208,740	19,177,447
Junior subordinated debt	373,996	360,458
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Financial assets
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	331,083	298,648
Loans, net	17,470,910	16,949,978
Financial liabilities
Deposits	20,225,997	19,188,216
Junior subordinated debt	400,718	381,496
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Financial assets
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Loans, net	0	0
Financial liabilities
Deposits	0	0
Junior subordinated debt	0	0
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Financial assets
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	331,083	298,648
Loans, net	17,344,300	16,857,852
Financial liabilities
Deposits	20,225,997	19,188,216
Junior subordinated debt	332,988	323,572
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Financial assets
Investment securities - HTM, at amortized cost; fair value of $331,083 at March 31, 2019 and $298,648 at December 31, 2018	0	0
Loans, net	126,610	92,126
Financial liabilities
Deposits	0	0
Junior subordinated debt	67,730	57,924
Fair Value, Measurements, Recurring [Member]
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247	3,276,988
Investment securities - equity	118,005	115,061
Derivative Asset	1,714	2,643
Financial liabilities
Derivative Liability	48,855	45,120
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	5,142	0
Investment securities - equity	118,005	115,061
Derivative Asset	0	0
Financial liabilities
Junior subordinated debt	0	0
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,239,105	3,276,988
Investment securities - equity	0	0
Derivative Asset	1,714	2,643
Financial liabilities
Junior subordinated debt	0	0
Derivative Liability	48,855	45,120
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Investment securities - equity	0	0
Derivative Asset	0	0
Financial liabilities
Junior subordinated debt	56,546	48,684
Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] | Reported Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Sold	290,000
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247	3,276,988
Investment securities - equity	118,005	115,061
Derivative Asset	1,714	2,643
Accrued Investment Income Receivable	98,128	101,275
Financial liabilities
Customer repurchase agreements	15,141	22,411
Derivative Liability	48,855	45,120
Interest Payable, Current	15,853	20,463
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Sold	290,000
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,244,247	3,276,988
Investment securities - equity	118,005	115,061
Derivative Asset	1,714	2,643
Accrued Investment Income Receivable	98,128	101,275
Financial liabilities
Customer repurchase agreements	15,141	22,411
Derivative Liability	48,855	45,120
Interest Payable, Current	15,853	20,463
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Sold	0
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	5,142	0
Investment securities - equity	118,005	115,061
Derivative Asset	0	0
Accrued Investment Income Receivable	0	0
Financial liabilities
Customer repurchase agreements	0	0
Derivative Liability	0	0
Interest Payable, Current	0	0
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Sold	290,000
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	3,239,105	3,276,988
Investment securities - equity	0	0
Derivative Asset	1,714	2,643
Accrued Investment Income Receivable	98,128	101,275
Financial liabilities
Customer repurchase agreements	15,141	22,411
Derivative Liability	48,855	45,120
Interest Payable, Current	15,853	20,463
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Federal Funds Sold	0
Financial assets
Investment securities - AFS, at fair value; amortized cost of $3,265,546 at March 31, 2019 and $3,339,888 at December 31, 2018	0	0
Investment securities - equity	0	0
Derivative Asset	0	0
Accrued Investment Income Receivable	0	0
Financial liabilities
Customer repurchase agreements	0	0
Derivative Liability	0	0
Interest Payable, Current	$ 0	$ 0

XML

Fair Value Accounting - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	$ 143,398		$ 112,252
Aggregate carrying amount of impaired loans	5,244		986
Impaired loans with an allowance recorded	(1,357)		(681)
Other assets acquired through foreclosure	17,700		17,900
Goodwill	$ 289,895		$ 289,895
Common Stock, Shares, Issued	106,449,184		106,741,870
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]
Impaired loans with an allowance recorded	$ (1,400)		$ (700)
Junior Subordinated Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Period of basis point spread	4.05%	5.01%
Percentage of LIBOR	2.60%	2.81%
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Aggregate carrying amount of impaired loans	$ 3,887		305
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Financing Receivable, Recorded Investment	126,610		92,126
Aggregate carrying amount of impaired loans	$ 3,887		$ 305

XML

Segments - Operating Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Operating Statistics [Line Items]
Service charges and fees	$ 5,412	$ 5,745
Cash, Cash Equivalents and Investment Securities	4,525,000		$ 4,259,700
Loans, net of deferred loan fees and costs	18,116,748		17,710,629
Less: Allowance for credit losses	(154,987)		(152,717)
Loans, net	17,961,761		17,557,912
Total loans held for investment	17,961,700
Other Repossessed Assets	17,700		17,900
Intangible Assets, Net (Including Goodwill)	298,800		299,200
Other Assets Segment	989,600		974,800
Assets	23,792,846		23,109,486
Deposits	20,208,740		19,177,447
Other borrowings	374,000		851,500
Other Liabilities Segment	489,500		466,900
Total liabilities	21,072,226		20,495,752
Stockholders' equity	2,720,620	2,293,763	2,613,734	$ 2,229,698	$ 2,229,698
Liabilities and Equity	23,792,846		23,109,486
Excess Funds Provided by (Used in) Segment Basis	0		0
Net interest income	247,336	214,220
Provision for Loan, Lease, and Other Losses	3,500	6,000
Net interest income (loss) after provision for credit losses	243,836	208,220
Total non-interest income	15,410	11,643
Non-interest expense	(112,914)	(98,149)
Income from continuing operations before income taxes	146,332	121,714
Income tax expense (benefit)	25,536	20,814
Net income	120,796	100,900
Debit and credit card interchange fees	1,865	1,508
Success fees (2)	435	781
Other income	119	235
Total revenue from contracts with customers	7,831	8,269
Revenues outside the scope of ASC 606 (3)	7,579	3,374
Operating Segments [Member] | HOA Services [Member]
Operating Statistics [Line Items]
Service charges and fees	88	146
Cash, Cash Equivalents and Investment Securities	0		0
Loans, net of deferred loan fees and costs	209,400		210,000
Less: Allowance for credit losses	(1,900)		(1,900)
Loans, net	207,500		208,100
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	0		0
Other Assets Segment	900		900
Assets	208,400		209,000
Deposits	2,963,000		2,607,200
Other borrowings	0		0
Other Liabilities Segment	2,000		2,100
Total liabilities	2,965,000		2,609,300
Stockholders' equity	77,700		70,700
Liabilities and Equity	3,042,700		2,680,000
Excess Funds Provided by (Used in) Segment Basis	2,834,300		2,471,000
Net interest income	20,641	15,359
Provision for Loan, Lease, and Other Losses	(27)	47
Net interest income (loss) after provision for credit losses	20,668	15,312
Total non-interest income	96	150
Non-interest expense	(8,460)	(7,803)
Income from continuing operations before income taxes	12,304	7,659
Income tax expense (benefit)	2,830	1,761
Net income	9,474	5,898
Debit and credit card interchange fees	8	3
Success fees (2)	0	0
Other income	0	0
Total revenue from contracts with customers	96	149
Revenues outside the scope of ASC 606 (3)	0	1
Operating Segments [Member] | Public and Non-Profit Finance [Member]
Operating Statistics [Line Items]
Service charges and fees	0	0
Cash, Cash Equivalents and Investment Securities	0		0
Loans, net of deferred loan fees and costs	1,561,700		1,547,500
Less: Allowance for credit losses	(14,800)		(14,200)
Loans, net	1,546,900		1,533,300
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	0		0
Other Assets Segment	12,500		20,100
Assets	1,559,400		1,553,400
Deposits	0		0
Other borrowings	0		0
Other Liabilities Segment	34,000		25,200
Total liabilities	34,000		25,200
Stockholders' equity	126,000		123,900
Liabilities and Equity	160,000		149,100
Excess Funds Provided by (Used in) Segment Basis	(1,399,400)		(1,404,300)
Net interest income	3,423	3,746
Provision for Loan, Lease, and Other Losses	(41)	(207)
Net interest income (loss) after provision for credit losses	3,464	3,953
Total non-interest income	0	0
Non-interest expense	(1,907)	(2,174)
Income from continuing operations before income taxes	1,557	1,779
Income tax expense (benefit)	358	409
Net income	1,199	1,370
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	0	0
Total revenue from contracts with customers	0	0
Revenues outside the scope of ASC 606 (3)	0	0
Operating Segments [Member] | Technology and Innovation [Member]
Operating Statistics [Line Items]
Service charges and fees	713	815
Cash, Cash Equivalents and Investment Securities	0		0
Loans, net of deferred loan fees and costs	1,057,300		1,200,900
Less: Allowance for credit losses	(8,400)		(10,000)
Loans, net	1,048,900		1,190,900
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	120,200		120,400
Other Assets Segment	6,400		6,300
Assets	1,175,500		1,317,600
Deposits	2,404,700		2,559,000
Other borrowings	0		0
Other Liabilities Segment	0		100
Total liabilities	2,404,700		2,559,100
Stockholders' equity	253,300		268,700
Liabilities and Equity	2,658,000		2,827,800
Excess Funds Provided by (Used in) Segment Basis	1,482,500		1,510,200
Net interest income	29,403	22,821
Provision for Loan, Lease, and Other Losses	(917)	1,651
Net interest income (loss) after provision for credit losses	30,320	21,170
Total non-interest income	3,362	3,051
Non-interest expense	(11,889)	(9,833)
Income from continuing operations before income taxes	21,793	14,388
Income tax expense (benefit)	5,012	3,309
Net income	16,781	11,079
Debit and credit card interchange fees	0	0
Success fees (2)	435	779
Other income	0	0
Total revenue from contracts with customers	1,148	1,594
Revenues outside the scope of ASC 606 (3)	2,214	1,457
Operating Segments [Member] | HFF Loan Portfolio [Member]
Operating Statistics [Line Items]
Service charges and fees	0	0
Cash, Cash Equivalents and Investment Securities	0		0
Loans, net of deferred loan fees and costs	1,564,900		1,479,900
Less: Allowance for credit losses	(9,500)		(8,500)
Loans, net	1,555,400		1,471,400
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	100		100
Other Assets Segment	7,700		7,200
Assets	1,563,200		1,478,700
Deposits	0		0
Other borrowings	0		0
Other Liabilities Segment	(300)		400
Total liabilities	(300)		400
Stockholders' equity	130,300		122,300
Liabilities and Equity	130,000		122,700
Excess Funds Provided by (Used in) Segment Basis	(1,433,200)		(1,356,000)
Net interest income	12,944	14,185
Provision for Loan, Lease, and Other Losses	799	1,236
Net interest income (loss) after provision for credit losses	12,145	12,949
Total non-interest income	0	13
Non-interest expense	(2,398)	(2,206)
Income from continuing operations before income taxes	9,747	10,756
Income tax expense (benefit)	2,242	2,474
Net income	7,505	8,282
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	0	0
Total revenue from contracts with customers	0	0
Revenues outside the scope of ASC 606 (3)	0	13
Operating Segments [Member] | Other National Business Lines [Member]
Operating Statistics [Line Items]
Service charges and fees	1	0
Cash, Cash Equivalents and Investment Securities	0		0
Loans, net of deferred loan fees and costs	4,549,000		4,154,900
Less: Allowance for credit losses	(40,700)		(38,200)
Loans, net	4,508,300		4,116,700
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	0		0
Other Assets Segment	58,800		37,100
Assets	4,567,100		4,153,800
Deposits	5,300		0
Other borrowings	0		0
Other Liabilities Segment	60,900		49,600
Total liabilities	66,200		49,600
Stockholders' equity	374,300		340,000
Liabilities and Equity	440,500		389,600
Excess Funds Provided by (Used in) Segment Basis	(4,126,600)		(3,764,200)
Net interest income	25,691	18,811
Provision for Loan, Lease, and Other Losses	2,978	1,285
Net interest income (loss) after provision for credit losses	22,713	17,526
Total non-interest income	657	224
Non-interest expense	(9,336)	(5,662)
Income from continuing operations before income taxes	14,034	12,088
Income tax expense (benefit)	3,228	2,780
Net income	10,806	9,308
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	38	0
Total revenue from contracts with customers	39	0
Revenues outside the scope of ASC 606 (3)	618	224
Corporate & Other
Operating Statistics [Line Items]
Service charges and fees	0	1
Cash, Cash Equivalents and Investment Securities	4,509,700		4,240,800
Loans, net of deferred loan fees and costs	4,100		4,700
Less: Allowance for credit losses	0		0
Loans, net	4,100		4,700
Other Repossessed Assets	3,100		3,200
Intangible Assets, Net (Including Goodwill)	0		0
Other Assets Segment	757,800		760,400
Assets	5,274,700		5,009,100
Deposits	706,500		738,000
Other borrowings	374,000		851,500
Other Liabilities Segment	355,400		347,900
Total liabilities	1,435,900		1,937,400
Stockholders' equity	468,800		422,700
Liabilities and Equity	1,904,700		2,360,100
Excess Funds Provided by (Used in) Segment Basis	(3,370,000)		(2,649,000)
Net interest income	7,402	(2,004)
Provision for Loan, Lease, and Other Losses	0	0
Net interest income (loss) after provision for credit losses	7,402	(2,004)
Total non-interest income	3,980	(92)
Non-interest expense	(12,822)	(8,734)
Income from continuing operations before income taxes	(1,440)	(10,830)
Income tax expense (benefit)	(10,063)	(11,376)
Net income	8,623	546
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	14	5
Total revenue from contracts with customers	14	6
Revenues outside the scope of ASC 606 (3)	3,966	(98)
Reportable Geographical Components [Member] | ARIZONA
Operating Statistics [Line Items]
Service charges and fees	1,079	917
Cash, Cash Equivalents and Investment Securities	2,300		2,500
Loans, net of deferred loan fees and costs	3,653,900		3,647,900
Less: Allowance for credit losses	(31,900)		(30,700)
Loans, net			3,617,200
Total loans held for investment	3,622,000
Other Repossessed Assets	700		800
Intangible Assets, Net (Including Goodwill)	0		0
Other Assets Segment	47,600		46,900
Assets	3,672,600		3,667,400
Deposits	5,319,900		5,090,200
Other borrowings	0		0
Other Liabilities Segment	11,600		10,400
Total liabilities	5,331,500		5,100,600
Stockholders' equity	447,700		441,000
Liabilities and Equity	5,779,200		5,541,600
Excess Funds Provided by (Used in) Segment Basis	2,106,600		1,874,200
Net interest income	55,226	54,555
Provision for Loan, Lease, and Other Losses	161	1,434
Net interest income (loss) after provision for credit losses	55,065	53,121
Total non-interest income	1,521	1,416
Non-interest expense	(22,248)	(21,504)
Income from continuing operations before income taxes	34,338	33,033
Income tax expense (benefit)	8,584	8,321
Net income	25,754	24,712
Debit and credit card interchange fees	337	257
Success fees (2)	0	0
Other income	9	61
Total revenue from contracts with customers	1,425	1,235
Revenues outside the scope of ASC 606 (3)	96	181
Reportable Geographical Components [Member] | NEVADA
Operating Statistics [Line Items]
Service charges and fees	1,915	2,069
Cash, Cash Equivalents and Investment Securities	9,100		10,900
Loans, net of deferred loan fees and costs	2,069,400		2,003,500
Less: Allowance for credit losses	(18,300)		(18,700)
Loans, net			1,984,800
Total loans held for investment	2,051,100
Other Repossessed Assets	13,900		13,900
Intangible Assets, Net (Including Goodwill)	23,200		23,200
Other Assets Segment	58,400		57,800
Assets	2,155,700		2,090,600
Deposits	4,006,800		3,996,400
Other borrowings	0		0
Other Liabilities Segment	12,000		14,500
Total liabilities	4,018,800		4,010,900
Stockholders' equity	283,100		277,400
Liabilities and Equity	4,301,900		4,288,300
Excess Funds Provided by (Used in) Segment Basis	2,146,200		2,197,700
Net interest income	39,096	36,690
Provision for Loan, Lease, and Other Losses	533	(1,723)
Net interest income (loss) after provision for credit losses	38,563	38,413
Total non-interest income	2,573	3,333
Non-interest expense	(15,781)	(14,084)
Income from continuing operations before income taxes	25,355	27,662
Income tax expense (benefit)	5,325	5,903
Net income	20,030	21,759
Debit and credit card interchange fees	376	272
Success fees (2)	0	0
Other income	23	69
Total revenue from contracts with customers	2,314	2,410
Revenues outside the scope of ASC 606 (3)	259	923
Reportable Geographical Components [Member] | Southern California [Member]
Operating Statistics [Line Items]
Service charges and fees	726	738
Cash, Cash Equivalents and Investment Securities	2,000		2,500
Loans, net of deferred loan fees and costs	2,249,800		2,161,100
Less: Allowance for credit losses	(20,100)		(19,800)
Loans, net			2,141,300
Total loans held for investment	2,229,700
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	0		0
Other Assets Segment	15,200		14,200
Assets	2,246,900		2,158,000
Deposits	2,793,800		2,347,500
Other borrowings	0		0
Other Liabilities Segment	500		4,500
Total liabilities	2,794,300		2,352,000
Stockholders' equity	260,500		242,900
Liabilities and Equity	3,054,800		2,594,900
Excess Funds Provided by (Used in) Segment Basis	807,900		436,900
Net interest income	30,477	27,802
Provision for Loan, Lease, and Other Losses	733	729
Net interest income (loss) after provision for credit losses	29,744	27,073
Total non-interest income	1,001	1,001
Non-interest expense	(14,583)	(13,646)
Income from continuing operations before income taxes	16,162	14,428
Income tax expense (benefit)	4,525	4,135
Net income	11,637	10,293
Debit and credit card interchange fees	173	139
Success fees (2)	0	0
Other income	9	27
Total revenue from contracts with customers	908	904
Revenues outside the scope of ASC 606 (3)	93	97
Reportable Geographical Components [Member] | Northern California [Member]
Operating Statistics [Line Items]
Service charges and fees	890	1,059
Cash, Cash Equivalents and Investment Securities	1,900		3,000
Loans, net of deferred loan fees and costs	1,197,200		1,300,200
Less: Allowance for credit losses	(9,400)		(10,700)
Loans, net			1,289,500
Total loans held for investment	1,187,800
Other Repossessed Assets	0		0
Intangible Assets, Net (Including Goodwill)	155,300		155,500
Other Assets Segment	24,300		23,900
Assets	1,369,300		1,471,900
Deposits	2,008,700		1,839,100
Other borrowings	0		0
Other Liabilities Segment	13,400		12,200
Total liabilities	2,022,100		1,851,300
Stockholders' equity	298,900		304,100
Liabilities and Equity	2,321,000		2,155,400
Excess Funds Provided by (Used in) Segment Basis	951,700		$ 683,500
Net interest income	23,033	22,255
Provision for Loan, Lease, and Other Losses	(719)	1,548
Net interest income (loss) after provision for credit losses	23,752	20,707
Total non-interest income	2,220	2,547
Non-interest expense	(13,490)	(12,503)
Income from continuing operations before income taxes	12,482	10,751
Income tax expense (benefit)	3,495	3,098
Net income	8,987	7,653
Debit and credit card interchange fees	971	837
Success fees (2)	0	2
Other income	26	73
Total revenue from contracts with customers	1,887	1,971
Revenues outside the scope of ASC 606 (3)	$ 333	$ 576

XML

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Service charges and fees	$ 5,412	$ 5,745
Accounts Receivable, Net	1,400		$ 1,400
Debit and credit card interchange fees	1,865	1,508
Success fees (2)	435	781
Other income	119	235
Total revenue from contracts with customers	7,831	8,269
Revenues outside the scope of ASC 606 (3)	7,579	3,374
Total non-interest income	15,410	11,643
Operating Segments [Member] | HOA Services [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	88	146
Debit and credit card interchange fees	8	3
Success fees (2)	0	0
Other income	0	0
Total revenue from contracts with customers	96	149
Revenues outside the scope of ASC 606 (3)	0	1
Total non-interest income	96	150
Operating Segments [Member] | Public and Non-Profit Finance [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	0	0
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	0	0
Total revenue from contracts with customers	0	0
Revenues outside the scope of ASC 606 (3)	0	0
Total non-interest income	0	0
Operating Segments [Member] | Technology and Innovation [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	713	815
Debit and credit card interchange fees	0	0
Success fees (2)	435	779
Other income	0	0
Total revenue from contracts with customers	1,148	1,594
Revenues outside the scope of ASC 606 (3)	2,214	1,457
Total non-interest income	3,362	3,051
Operating Segments [Member] | HFF Loan Portfolio [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	0	0
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	0	0
Total revenue from contracts with customers	0	0
Revenues outside the scope of ASC 606 (3)	0	13
Total non-interest income	0	13
Operating Segments [Member] | Other National Business Lines [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	1	0
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	38	0
Total revenue from contracts with customers	39	0
Revenues outside the scope of ASC 606 (3)	618	224
Total non-interest income	657	224
Reportable Geographical Components [Member] | ARIZONA
Disaggregation of Revenue [Line Items]
Service charges and fees	1,079	917
Debit and credit card interchange fees	337	257
Success fees (2)	0	0
Other income	9	61
Total revenue from contracts with customers	1,425	1,235
Revenues outside the scope of ASC 606 (3)	96	181
Total non-interest income	1,521	1,416
Reportable Geographical Components [Member] | NEVADA
Disaggregation of Revenue [Line Items]
Service charges and fees	1,915	2,069
Debit and credit card interchange fees	376	272
Success fees (2)	0	0
Other income	23	69
Total revenue from contracts with customers	2,314	2,410
Revenues outside the scope of ASC 606 (3)	259	923
Total non-interest income	2,573	3,333
Reportable Geographical Components [Member] | Southern California [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	726	738
Debit and credit card interchange fees	173	139
Success fees (2)	0	0
Other income	9	27
Total revenue from contracts with customers	908	904
Revenues outside the scope of ASC 606 (3)	93	97
Total non-interest income	1,001	1,001
Reportable Geographical Components [Member] | Northern California [Member]
Disaggregation of Revenue [Line Items]
Service charges and fees	890	1,059
Debit and credit card interchange fees	971	837
Success fees (2)	0	2
Other income	26	73
Total revenue from contracts with customers	1,887	1,971
Revenues outside the scope of ASC 606 (3)	333	576
Total non-interest income	2,220	2,547
Corporate & Other
Disaggregation of Revenue [Line Items]
Service charges and fees	0	1
Debit and credit card interchange fees	0	0
Success fees (2)	0	0
Other income	14	5
Total revenue from contracts with customers	14	6
Revenues outside the scope of ASC 606 (3)	3,966	(98)
Total non-interest income	$ 3,980	$ (92)

XML

Label	Element	Value
Supplemental Employee Retirement Plan [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ 469,000
Retained Earnings [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	849,524,000
AOCI Attributable to Parent [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(4,203,000)
Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	7,740,000
Common Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 10,000
Shares, Issued	us-gaap_SharesIssued	105,487,000
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	$ (12,556,000)
Treasury Stock [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	(40,173,000)
Accumulated Other-than-Temporary Impairment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax	us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax	144,000
Additional Paid-in Capital [Member]
Stockholders' Equity Attributable to Parent	us-gaap_StockholdersEquity	$ 1,424,540,000