10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended June 30, 2015

or

¨ TRANSITION REPORT PURSUANT TO SECTION 13 OF 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from______ to ______

Commission File Number: 001-36372

SQUARE 1 FINANCIAL, INC.

(Exact name of registrant as specified in its charter)

Delaware	20-1872698
(State or other jurisdiction of incorporation or organization)	(IRS Employer Identification Number)
406 Blackwell Street, Suite 240 Durham, North Carolina	27701
(Address of principal executive offices)	(Zip Code)
(866) 355-0468
(Registrant’s telephone number, including area code)

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

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

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

Large accelerated filer	¨	Accelerated filer	¨
Non-accelerated filer	x  (Do not check if a smaller reporting company)	Smaller reporting company	¨

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

At July 31, 2015, 29,913,520 shares of the registrant’s common stock ($0.01 par value) were outstanding.

TABLE OF CONTENTS

		Page
PART I.	FINANCIAL INFORMATION
ITEM 1.	INTERIM CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)	3
	Interim Consolidated Balance Sheets as of June 30, 2015 (Unaudited) and December 31, 2014	3
	Interim Consolidated Statements of Income (Unaudited) for the three and six months ended June 30, 2015 and 2014	4
	Interim Consolidated Statements of Comprehensive Income (Unaudited) for the three and six months ended June 30, 2015 and 2014	5
	Interim Consolidated Statements of Changes in Shareholders’ Equity (Unaudited) for the six months ended June 30, 2015 and 2014	6
	Interim Consolidated Statements of Cash Flows (Unaudited) for the six months ended June 30, 2015 and 2014	7
	Notes to the Interim Consolidated Financial Statements (Unaudited)	8
ITEM 2.	MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	44
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	83
ITEM 4.	CONTROLS AND PROCEDURES	83
PART II.	OTHER INFORMATION
ITEM 1.	LEGAL PROCEEDINGS	84
ITEM 1A.	RISK FACTORS	84
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	84
ITEM 3.	DEFAULTS UPON SENIOR SECURITIES	84
ITEM 5.	OTHER INFORMATION	84
ITEM 6.	EXHIBITS	85

PART I - FINANCIAL INFORMATION

ITEM 1. INTERIM CONSOLIDATED FINANCIAL STATEMENTS

Square 1 Financial, Inc.

Interim Consolidated Balance Sheets

(in thousands, except share and per share data)	June 30, 2015			December 31, 2014
Assets	(Unaudited)
Cash and due from banks	$	39,579		$	13,650
Interest-bearing deposits in other banks	347,768			72,292
Total cash and cash equivalents	387,347			85,942
Investment in time deposits	1,002			1,251
Investment securities—available for sale, at fair value	1,541,342			1,294,533
Investment securities—held to maturity, at amortized cost	392,872			300,425
Loans, net of unearned income of $8.8 million and $7.9 million	1,516,032			1,346,449
Less allowance for loan losses	(25,037		)	(22,906		)
Net loans	1,490,995			1,323,543
Premises and equipment, net	4,015			4,026
Deferred income tax assets, net	10,666			9,672
Bank owned life insurance	51,582			50,723
Intangible assets	1,745			1,615
Other receivables	3,500			3,226
Warrant valuation	5,125			4,304
Prepaid expenses	1,779			2,063
Accrued interest receivable and other assets	20,533			13,543
Total assets	$	3,912,503		$	3,094,866
Liabilities and Shareholders’ Equity
Deposits:
Demand, noninterest-bearing	$	2,372,673		$	1,851,004
Demand, interest-bearing	100,496			71,598
Money market deposit accounts	1,081,211			837,630
Time deposits	9,384			16,320
Total deposits	3,563,764			2,776,552
Accrued interest payable and other liabilities	22,093			15,610
Total liabilities	3,585,857			2,792,162
Commitments and contingencies (Notes 11 and 16)
Shareholders’ equity:
Common stock, $.01 par value; 70,000,000 and 45,000,000 shares authorized, respectively (Note 9):
Class A common stock, $.01 par value; 26,485,682 shares and 25,487,568 shares issued and outstanding, respectively	265			255
Class B convertible common stock, $.01 par value; 3,395,110 shares issued and outstanding	34			34
Additional paid in capital	256,382			251,597
Accumulated other comprehensive income	8,479			7,404
Retained earnings	61,486			43,414
Total shareholders’ equity	326,646			302,704
Total liabilities and shareholders’ equity	$	3,912,503		$	3,094,866

The accompanying notes are an integral part of these consolidated financial statements.

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Square 1 Financial, Inc.

Interim Consolidated Statements of Income (Unaudited)

(in thousands, except per share data)	Three Months Ended   June 30,				Six Months Ended   June 30,
	2015		2014		2015		2014
Interest income:
Loans including fees on loans	$	22,207	$	17,720	$	42,341	$	34,123
Investment securities:
Taxable	6,795		5,382		13,693		9,943
Non-taxable	2,463		1,836		4,792		3,608
Federal funds and other short-term investments	128		137		168		201
Total interest income	31,593		25,075		60,994		47,875
Interest expense:
Deposits	193		143		404		273
Borrowings and repurchase agreements	1		—		46		4
Junior subordinated debt	—		56		—		215
Total interest expense	194		199		450		492
Net interest income	31,399		24,876		60,544		47,383
Provision for loan losses	3,758		3,150		9,205		6,114
Net interest income after provision for loan losses	27,641		21,726		51,339		41,269
Noninterest income:
Service charges and fees	1,325		1,126		2,583		2,194
Foreign exchange fees	1,620		1,363		3,338		3,004
Credit card and merchant income	1,100		765		2,121		1,401
Investment impairment	—		—		—		(43		)
Net gain on securities	1,025		38		821		47
Letter of credit fees	455		297		697		812
Warrant income	239		21		701		2,216
Gain on sale of loans	592		249		1,398		502
Bank owned life insurance	424		317		859		607
Other	852		2,196		1,326		2,771
Total noninterest income	7,632		6,372		13,844		13,511
Noninterest expense:
Personnel	12,541		10,725		24,768		21,359
Occupancy	880		773		1,703		1,513
Data processing	1,049		918		1,986		1,740
Furniture and equipment	793		660		1,558		1,362
Advertising and promotions	383		342		624		617
Professional fees	1,089		786		1,901		1,387
Telecommunications	286		285		577		545
Travel	285		292		482		458
FDIC assessment	497		347		916		752
Merger-related expenses	792		—		1,004		—
Other	1,712		1,472		3,125		2,450
Total noninterest expense	20,307		16,600		38,644		32,183
Income before income tax expense	14,966		11,498		26,539		22,597
Income tax expense	5,047		3,447		8,467		6,698
Net income	9,919		8,051		18,072		15,899
Dividends on preferred stock	—		1		—		63
Net income available to common shareholders	$	9,919	$	8,050	$	18,072	$	15,836
Earnings per share—basic	$	0.33	$	0.28	$	0.61	$	0.61
Earnings per share—diluted	$	0.33	$	0.27	$	0.60	$	0.58

The accompanying notes are an integral part of these consolidated financial statements.

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Square 1 Financial, Inc.

Interim Consolidated Statements of Comprehensive Income (Unaudited)

(in thousands)	Three Months Ended   June 30,						Six Months Ended   June 30,
	2015			2014			2015			2014
Net income	$	9,919		$	8,051		$	18,072		$	15,899
Other comprehensive income, net of tax:
Unrealized (losses) gains on securities:
Unrealized holding (losses) gains arising during period	(2,924		)	6,135			1,713			11,454
Less: reclassification adjustment for gains included in net income	(873		)	(50		)	(638		)	(50		)
Other comprehensive (loss) income	(3,797		)	6,085			1,075			11,404
Comprehensive income	6,122			14,136			19,147			27,303
Dividends on preferred stock	—			1			—			63
Comprehensive income available to common shareholders	$	6,122		$	14,135		$	19,147		$	27,240

The accompanying notes are an integral part of these consolidated financial statements.

5

Square 1 Financial, Inc.

Interim Consolidated Statements of Changes in Shareholders’ Equity (Unaudited)

(dollars in thousands)					Common Stock						Additional Paid in Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Total
	Preferred Stock				Class A			Class B
	Shares		Amount		Shares	Amount		Shares	Amount
Balance at December 31, 2013	5,000		$	—	19,699,136	$	197	3,912,610	$	39	$	183,716		$	(4,096	)	$	9,294		$	189,150
Issuance of common stock, net issuance costs of $2.3 million	—		—		3,786,810	38		—	—		59,531			—			—			59,569
Stock-based compensation	—		—		—	—		—	—		1,707			—			—			1,707
Conversion of preferred stock	(5,000	)	—		500,070	5		—	—		(4		)	—			—			1
Conversion of trust preferred securities	—		—		741,500	7		—	—		6,023			—			—			6,030
Dividends on preferred stock	—		—		—	—		—	—		—			—			(63		)	(63		)
Net income	—		—		—	—		—	—		—			—			15,899			15,899
Unrealized gain on securities net of tax of $3.2 million	—		—		—	—		—	—		—			11,404			—			11,404
Balance at June 30, 2014	—		$	—	24,727,516	$	247	3,912,610	$	39	$	250,973		$	7,308		$	25,130		$	283,697
Balance at December 31, 2014	—		$	—	25,487,568	$	255	3,395,110	$	34	$	251,597		$	7,404		$	43,414		$	302,704
Issuance of common stock	—		—		998,114	10		—	—		2,564			—			—			2,574
Stock-based compensation	—		—		—	—		—	—		2,221			—			—			2,221
Conversion of preferred stock	—		—		—	—		—	—		—			—			—			—
Conversion of trust preferred securities	—		—		—	—		—	—		—			—			—			—
Dividends on preferred stock	—		—		—	—		—	—		—			—			—			—
Net income	—		—		—	—		—	—		—			—			18,072			18,072
Unrealized gain on securities net of tax of $0.7 million	—		—		—	—		—	—		—			1,075			—			1,075
Balance at June 30, 2015	—		$	—	26,485,682	$	265	3,395,110	$	34	$	256,382		$	8,479		$	61,486		$	326,646

The accompanying notes are an integral part of these consolidated financial statements.

6

Square 1 Financial, Inc.

Interim Consolidated Statements of Cash Flows (Unaudited)

(in thousands)	Six Months Ended   June 30,
	2015			2014
Net income	$	18,072		$	15,899
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	631			465
Amortization on investment securities, net	11,900			8,211
Provision for loan losses	9,205			6,114
Stock-based compensation	2,221			1,707
Gain on sale of securities available for sale	(821		)	(47		)
Investment impairment	—			43
Deferred income tax provision	(1,674		)	(2,299		)
Earnings on bank owned life insurance	(859		)	(607		)
Changes in assets and liabilities:
Accrued interest receivable and other assets	(7,946		)	(630		)
Accrued interest payable and other liabilities	6,483			1,056
Net cash provided by operating activities	37,212			29,912
Cash flows from investing activities:
Net increase in investment in time deposits	249			—
Purchase of securities available for sale	(411,900		)	(229,866		)
Purchase of securities held to maturity	(103,951		)	(57,373		)
Proceeds from calls/maturities of securities available for sale	102,423			69,177
Proceeds from sales of securities available for sale	55,322			2,586
Proceeds from paydowns of securities held to maturity	9,539			—
Net increase in loans	(176,656		)	(72,017		)
Purchase of bank owned life insurance	—			(2,635		)
Purchases of premises and equipment	(619		)	(907		)
Net cash used in investing activities	(525,593		)	(291,035		)
Cash flows from financing activities:
Net increase in deposits	787,212			338,438
Net decrease in repurchase agreements	—			(12,737		)
Preferred dividends paid	—			(63		)
Proceeds from issuance of common stock, net of issuance costs	260			58,758
Issuance of shares under stock-based compensation plan	2,314			635
Net cash provided by financing activities	789,786			385,031
Net change in cash and cash equivalents	301,405			123,908
Cash and cash equivalents at beginning of period	85,942			105,730
Cash and cash equivalents at end of period	$	387,347		$	229,638
Supplemental statement of cash flow disclosures
Interest paid	$	449		$	293
Income taxes paid	$	7,285		$	4,268
Schedule of noncash investing transactions
Conversion of trust preferred securities to common stock	$	—		$	7,415

The accompanying notes are an integral part of these consolidated financial statements.

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Notes to the Interim Consolidated Financial Statements (Unaudited)

1. ORGANIZATION AND BASIS OF PRESENTATION

Organization and Nature of Operations

Square 1 Financial, Inc. (the “Company”) is a bank holding company incorporated under the laws of Delaware on October 6, 2004. The Company closed on its initial public offering ("IPO") on March 31, 2014. The Company’s primary function is to serve as the holding company for its wholly owned subsidiary, Square 1 Bank. Square 1 Bank (the “Bank”) was incorporated under the laws of North Carolina on July 11, 2005 and commenced banking operations on August 8, 2005. The Bank is not a member of the Federal Reserve System. The Bank provides a full range of commercial banking services primarily to companies that have received institutional investment, typically from venture capital and private equity sources. The Bank also provides a full range of services to venture capital and private equity firms. The Bank’s primary source of revenue is interest earned from loans to customers and from invested cash and securities and non-interest income derived from various fees. During 2007, the Company formed Square 1 Ventures, LLC (a Delaware limited liability company), a wholly owned subsidiary established to sponsor a fund of funds. Square 1 Ventures, LLC is consolidated into the Company’s financial statements. In 2013, the Bank formed Square 1 Asset Management, a wholly owned subsidiary of the Bank and SEC-registered investment adviser, to provide an investment alternative for clients. The Bank also acquired the business operations and key employees of Sand Hill Finance LLC, a factoring company, as part of the Bank's strategy to continue to grow its asset-based lending portfolio and has integrated the factoring product into its existing suite of asset-based lending products.

The Bank operates one branch in Durham, NC and loan production offices in Menlo Park, San Francisco, San Diego, Campbell, and Los Angeles and Orange County, CA; and Austin, Boston, Chicago, Denver, Minneapolis, New York, Seattle and the District of Columbia area. The Company’s corporate headquarters are located in Durham, NC.

Proposed Merger with PacWest Bancorp

On March 1, 2015, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with PacWest Bancorp ("PacWest"), pursuant to which the Company will merge with and into PacWest, with PacWest as the surviving corporation (the “Merger”). The Merger Agreement also provides that immediately following the Merger, the Bank will merge with and into Pacific Western Bank, a California state-chartered bank and wholly owned subsidiary of PacWest, with Pacific Western Bank as the surviving bank. Under the terms and subject to the conditions of the Merger Agreement, each issued and outstanding share of common stock of the Company will be converted into the right to receive 0.5997 of a share of PacWest common stock. The transaction is currently valued at approximately $867 million. Completion of the Merger is subject to certain customary conditions, including approval by the Company’s shareholders and the receipt of certain required regulatory approvals. The Merger was approved by the Company's shareholders on July 29, 2015. PacWest and Square 1 expect that the Merger will be completed during the fourth quarter of 2015. However, it is possible that factors outside the control of both companies, including whether or when the required regulatory approvals will be received, could result in the Merger being completed at a different time or not at all. The Company recorded $0.8 million and $1.0 million, respectively, in merger-related expenses during the three and six months ended June 30,2015.

Basis of Presentation

These unaudited interim consolidated financial statements have been prepared on a consistent basis with the accounting policies described in the notes to the audited financial statements for the fiscal year ended December 31, 2014 included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”), as filed with the Securities and Exchange Commission ("SEC") on March 20, 2015. These unaudited interim consolidated financial statements have also been prepared in accordance with the instructions for Form 10-Q pursuant to the rules and regulations of the SEC, and as such certain footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted. Because the accompanying interim financial statements do not include all of the information and footnotes required by GAAP for annual financial statements, they should be read in conjunction with the audited financial statements for the fiscal year ended December 31, 2014 and notes thereto included in the 2014 Form 10-K. Certain prior year amounts have been reclassified to conform to current year presentation. Credit card and merchant income, previously included in service charges and fees, is presented separately and income from loan documentation fees, previously presented separately, is included in other noninterest income. The amount of foreign exchange clearing, previously presented in other assets, changes daily based on transactions and is presented in cash and due from banks. Merger-related expenses previously included in Other noninterest expenses in the quarterly report for the period ending March 31, 2015 is presented separately.

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The amounts included in these financial statements are unaudited but, in the opinion of management, reflect all adjustments necessary to fairly present the Company’s financial position and results of operations for the interim periods. Unless otherwise noted, all adjustments are normal and recurring in nature. In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The results of operations for interim periods are not necessarily indicative of amounts expected for the entire year or future periods.

Principles of Consolidation

The consolidated financial statements include the financial statements of Square 1 Financial and its consolidated subsidiaries and other entities in which it has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. In addition, the Company evaluates its relationships with other entities to identify whether they are variable interest entities ("VIEs") and to assess whether it is the primary beneficiary of such entities. If the determination was made that the Company is the primary beneficiary, then that entity would be included in the consolidated financial statements. If an entity is not a VIE, the Company also evaluates arrangements in which there is a general partner or managing member to determine whether consolidation is appropriate.

Square 1 Venture 1, L.P.-The Company owns approximately a 2% partnership interest in Square 1 Venture 1, L.P., which was formed for the primary purpose of sponsoring a fund of funds. The Company has determined that Square 1 Venture 1, L.P. is not a VIE for all periods presented; accordingly, Square 1 Venture 1, L.P. is not consolidated with the Company. The Company accounts for the investment in Square 1 Venture 1, L.P. using the equity method of accounting. For the three and six months ended June 30,2015, gains of $0.1 million were recognized. For the three and six months ended June 30,2014, gains of $0.7 million were recognized. The fair value of the investment at June 30, 2015 and December 31, 2014 was $1.6 million and $1.5 million, respectively, and is included in other assets on the balance sheet.

On April 1, 2014, Square 1 Ventures, LLC transferred the contract for the management of Square 1 Venture 1, L.P. to Industry Ventures, a fund-of-funds manager in San Francisco, CA. In connection with this transfer, the Company recorded a gain of $0.5 million. The impact of the sale of the management contract has not had an ongoing material impact to the Company's results of operations or financial condition.

Use of Estimates in the Preparation of Financial Statements

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The more significant estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, the valuation of investment securities, recognition and measurement of income tax assets and liabilities and the valuation of equity warrant assets and foreclosed assets.

Cash and Cash Equivalents

Cash and cash equivalents include noninterest-earning and interest-earning deposits at other institutions, federal funds sold and other short term investments. Generally, federal funds are purchased and sold for one-day periods. At times, the Bank places deposits with high credit-quality financial institutions in amounts which may be in excess of federally insured limits. The Bank is required to maintain reserve and clearing balances with the Federal Reserve Bank. Accordingly, the Bank has amounts restricted for this purpose of $24.2 million and $19.8 million in the consolidated balance sheet at June 30, 2015 and December 31, 2014, respectively.

2. NEW ACCOUNTING STANDARDS

In May 2015, the FASB issued Accounting Standards Update (ASU) 2015-07, Fair Value Measurement (Topic 820), Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). Under the guidance in ASU 2015-07, investments for which fair value is measured using the net asset value per share practical expedient will no longer be categorized within the fair value hierarchy levels, but will be presented as a reconciling line item. Investments that calculate net asset value per share (or its equivalent), but for which the practical expedient is not applied will continue to be included in the fair value hierarchy. ASU 2015-07 also eliminates the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value by limiting

9

those disclosure requirements to investments for which the entity has elected to measure the fair value using that practical expedient. ASU 2015-07 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-07 must be applied retrospectively for all periods presented. The Company is currently assessing the impacts of adopting ASU 2015-07.

In April 2015, the FASB issued ASU No. 2015-05, Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40), Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance to customers to determine whether a cloud computing arrangement includes a software license. When a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses and when a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance in ASC 350-40 applies to hosting contracts where the customer has the contractual right to take possession of the software at any time during the hosting period without significant penalty and it is feasible for the customer to either run the software on its own hardware or contract with another party unrelated to the vendor to host the software. Otherwise, the arrangement should be considered a service contract. ASU 2015-05 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-05 may be adopted prospectively to all arrangements entered into or materially modified after the effective date or retrospectively. The Company is currently assessing the impacts of adopting ASU 2015-05.

In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 simplifies the presentation of debt issuance costs whereby debt issuance costs related to a recognized debt liability shall be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-03 should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. The Company does not expect the adoption of ASU 2015-03 to have a material effect on the Company's balance sheet presentation.

3. INVESTMENT SECURITIES

Investments in securities are classified into three categories and accounted for as follows:

Securities Held to Maturity—Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost; or

Trading Securities—Debt and equity securities that are bought and held principally for the purpose of selling in the near term are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings; or

Securities Available for Sale—Debt and equity securities not classified as either held to maturity securities or trading securities are classified as available for sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported as other comprehensive income, a separate component of shareholders’ equity.

The Company intends to hold its securities classified as available for sale securities for an indefinite period of time but may sell them prior to maturity. All other securities, which the Company has the positive intent and ability to hold to maturity, are classified as held to maturity securities. The initial classification of securities is determined at the date of purchase. Gains and losses on sales of securities, computed based on specific identification of the adjusted cost of each security, are included in noninterest income at the time of the sales. The Company's investments include agency direct obligations, Small Business Administration ("SBA") pools, agency and non-agency mortgage backed securities ("MBS"), corporate securities, municipal bonds, and asset backed securities ("ABS"). Equity securities include securities obtained from the exercise of equity warrants and required to be held until the expiration of their respective lock-up periods, which expire within one year. The Company intends to monetize these securities upon removal of all sale restrictions (see Note 14).

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The following tables summarize the amortized cost and fair value of securities available for sale and securities held to maturity at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
U.S. treasuries	$	159,264	$	243	$	(6	)	$	159,501
Agency direct obligations	30,323		112		—			30,435
SBA pools	162,014		2,606		(46		)	164,574
Agency MBS	666,405		9,871		(1,991		)	674,285
Municipal bonds	97,417		1,782		(268		)	98,931
Corporates	117,397		3,243		(15		)	120,625
Non-agency MBS	185,662		1,018		(1,567		)	185,113
Other ABS	107,495		233		(754		)	106,974
Equity securities	1,099		—		(195		)	904
Total	$	1,527,076	$	19,108	$	(4,842	)	$	1,541,342
Held to maturity securities:
Agency MBS	$	102,368	$	1,991	$	(2,481	)	$	101,878
Municipal bonds	230,582		5,752		(2,540		)	233,794
Corporates	59,922		341		(3,120		)	57,143
Total	$	392,872	$	8,084	$	(8,141	)	$	392,815

(in thousands)	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
U.S. treasuries	$	29,604	$	44	$	(7	)	$	29,641
Agency direct obligations	30,536		95		—			30,631
SBA pools	177,982		2,145		(305		)	179,822
Agency MBS	606,677		9,360		(1,115		)	614,922
Municipal bonds	96,016		2,477		(3		)	98,490
Corporates	117,025		1,732		(398		)	118,359
Non-agency MBS	173,322		1,237		(1,460		)	173,099
Other ABS	48,450		25		(854		)	47,621
Equity securities	2,422		17		(491		)	1,948
Total	$	1,282,034	$	17,132	$	(4,633	)	$	1,294,533
Held to maturity securities:
Agency MBS	$	58,851	$	1,015	$	(107	)	$	59,759
Municipal bonds	181,567		9,187		(445		)	190,309
Corporates	60,007		32		(3,701		)	56,338
Total	$	300,425	$	10,234	$	(4,253	)	$	306,406

Investment securities with a fair value of $335.5 million and $285.7 million at June 30, 2015 and December 31, 2014, respectively, were pledged to secure customer repurchase agreements and to secure prospective borrowing capacities at the Company's correspondent banks, the Federal Reserve Bank, and the Federal Home Loan Bank of Atlanta.

At June 30, 2015 and December 31, 2014, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholder's equity.

11

The proceeds from sales and calls of securities and the associated gains and losses were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2015		2014		2015		2014
Proceeds	$	95,671	$	41,554	$	157,745	71,763
Gross gains	1,184		100		1,296		109
Gross losses	159		62		475		62

The following tables show the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired. Investment securities contained in the table are aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available for sale securities:
U.S. treasuries	$	19,522	$	(6	)	$	—	$	—		$	19,522	$	(6	)
SBA pools	8,167		(46		)	$	3,483	—			11,650		(46		)
Agency MBS	120,677		(1,523		)	21,699		(468		)	142,376		(1,991		)
Municipal bonds	15,410		(268		)	—		—			15,410		(268		)
Corporates	—		—			5,005		(15		)	5,005		(15		)
Non-agency MBS	71,196		(888		)	26,823		(679		)	98,019		(1,567		)
Other ABS	35,830		(232		)	3,349		(522		)	39,179		(754		)
Equity securities	904		(195		)	—		—			904		(195		)
Total	$	271,706	$	(3,158	)	$	60,359	$	(1,684	)	$	332,065	$	(4,842	)
Held to maturity securities:
Agency MBS	$	49,421	$	(2,346	)	$	2,401	$	(135	)	$	51,822	$	(2,481	)
Municipal bonds	84,251		(2,176		)	8,755		(364		)	93,006		(2,540		)
Corporates	29,436		(1,254		)	6,420		(1,866		)	35,856		(3,120		)
Total	$	163,108	$	(5,776	)	$	17,576	$	(2,365	)	$	180,684	$	(8,141	)

12

(in thousands)	December 31, 2014
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available for sale securities:
U.S. treasuries	$	9,895	$	(7	)	$	—	$	—		$	9,895	$	(7	)
SBA pools	34,287		(296		)	4,186		(9		)	38,473		(305		)
Agency MBS	128,717		(889		)	17,935		(226		)	146,652		(1,115		)
Municipal bonds	1,671		(3		)	—		—			1,671		(3		)
Corporates	24,140		(398		)	—		—			24,140		(398		)
Non-agency MBS	61,284		(637		)	21,558		(823		)	82,842		(1,460		)
Other ABS	37,527		(146		)	4,708		(708		)	42,235		(854		)
Equity securities	1,859		(491		)	—		—			1,859		(491		)
Total	$	299,380	$	(2,867	)	$	48,387	$	(1,766	)	$	347,767	$	(4,633	)
Held to maturity securities:
Agency MBS	$	—	$	—		$	5,856	$	(107	)	$	5,856	$	(107	)
Municipal bonds	10,657		(116		)	12,688		(329		)	23,345		(445		)
Corporates	40,959		(1,846		)	6,420		(1,855		)	47,379		(3,701		)
Total	$	51,616	$	(1,962	)	$	24,964	$	(2,291	)	$	76,580	$	(4,253	)

At June 30, 2015, there were a total of 52 available for sale securities that were in an unrealized loss position, of which 24 investments had fair values less than their amortized cost for a period of time greater than 12 months. At December 31, 2014, there were a total of 78 available for sale securities that were in an unrealized loss position, of which 24 investments had fair values less than their amortized cost for a period of time greater than 12 months. At June 30, 2015, the fair value of equity securities included $0.1 million in equity securities obtained from the exercise of equity warrants, which the Company intends to monetize upon removal of all sale restrictions, and $0.8 million in other equity securities. At December 31, 2014, the fair value of equity securities included $0.9 million in equity securities obtained from the exercise of equity warrants, which the Company intends to monetize upon removal of all sale restrictions, and $1.0 million in other equity securities.

The Company performs extensive ongoing evaluations of the investment portfolio at the individual security level, including market valuations and impairment analyses. The Company had recorded no impairment for the three months ended June 30,2015 and 2014. The Company had recorded no impairment for the six months ended June 30,2015 and $43 thousand of impairment on certain mortgage-related securities for the six months ended June 30,2014. The Company deemed these securities permanently impaired and unlikely to receive full principal, even if the investments were held to maturity. The Company believes the remainder of the investment portfolio, based on the evaluation performed, will be paid in full and that any temporary impairment will be fully recoverable prior to or at maturity. The Company has the ability and intent to hold the investment securities until forecasted recovery of fair value or until maturity.

13

The amortized cost of debt securities at June 30, 2015, by contractual maturity, is shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in thousands)	June 30, 2015
	Total Amortized Cost		Less than One Year Amortized Cost		After One Year to Five Years Amortized Cost		After Five Years to Ten Years Amortized Cost		After Ten Years Amortized Cost
Available for sale securities:
Contractual maturity
U.S. treasuries	$	159,264	$	—	$	159,264	$	—	$	—
Agency direct obligations	30,323		20,272		10,051		—		—
SBA pools	162,014		—		4,136		82,765		75,113
Agency MBS	666,405		—		2,398		29,622		634,385
Municipal bonds	97,417		—		—		15,185		82,232
Corporates	117,397		13,928		41,843		12,954		48,672
Non-agency MBS	185,662		—		701		7,417		177,544
Other ABS	107,495		3,516		36,755		26,387		40,837
Total	$	1,525,977	$	37,716	$	255,148	$	174,330	$	1,058,783
Held to maturity securities:
Contractual maturity
Agency MBS	$	102,368	$	—	$	—	$	—	$	102,368
Municipal bonds	230,582		—		—		18,295		212,287
Corporates	59,922		—		—		—		59,922
Total	$	392,872	$	—	$	—	$	18,295	$	374,577

There were no transfers between the available for sale portfolio and the held to maturity portfolio for the three and six months ended June 30,2015 and 2014.

14

4. LOANS AND ALLOWANCE FOR LOAN LOSSES

Loans

The composition of loans, net of unearned income, broken out by portfolio segment at June 30, 2015 and December 31, 2014, are as follows:

(in thousands)	June 30, 2015			December 31, 2014
Commercial loans:
Technology	$	739,016		$	631,979
Life sciences	307,240			274,057
Asset-based loans	143,204			177,701
Venture capital/private equity	216,268			169,143
SBA and USDA	36,926			35,609
Other	14,062			6,854
Total commercial loans	1,456,716			1,295,343
Real estate loans:
SBA and USDA	37,995			36,978
Total real estate loans	37,995			36,978
Construction loans:
SBA and USDA	6,752			4,035
Total construction loans	6,752			4,035
Credit cards	23,379			17,980
Less unearned income, net	(8,810		)	(7,887		)
Total loans, net of unearned income	$	1,516,032		$	1,346,449

The Bank makes loans under the Small Business Administration (SBA) and United States Department of Agriculture (USDA) programs. At June 30, 2015 and December 31, 2014, the outstanding balances of these loans being serviced were $142.5 million and $135.3 million, respectively. The SBA/USDA guaranteed portions of five and seven of these loans were sold to the secondary market during the six months ended June 30,2015 and 2014, respectively. The cumulative outstanding sold balance at June 30, 2015 and December 31, 2014, was $57.5 million and $57.2 million, respectively.

The Company accounts for loan servicing rights or liabilities under Accounting Standards Codification (ASC) 860, “Transfers and Servicing.” ASC 860 requires the Company to recognize a servicing asset or servicing liability each time it undertakes an obligation to service a financial asset. Changes in the fair value of the servicing asset are recognized in other noninterest income. The valuation methodology estimates the present value of future cash flows based on the unique characteristics of the loan, market-based assumptions for prepayment speeds, and discount rate assumptions. The servicing asset is recorded in intangible assets in the financial statements.

See Note 15 for a summary of the activity for the Company's servicing assets.

15

Allowance for Loan Losses

The following tables summarize the activity in the allowance for loan losses during the three and six months ended June 30,2015 and 2014, broken out by portfolio segment:

(in thousands)	Three Months Ended June 30, 2015
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	12,714	$	1,630	$	6	$	3,369		$	14,459
Life sciences	4,581		600		—		(73		)	3,908
Asset-based loans	3,025		938		—		74			2,161
Venture capital/private equity	331		—		—		43			374
SBA and USDA	534		26		1		113			622
Other	2,474		246		—		291			2,519
Total commercial loans	23,659		3,440		7		3,817			24,043
Real estate loans:
SBA and USDA	826		27		—		(100		)	699
Total real estate loans	826		27		—		(100		)	699
Construction:
SBA and USDA	49		—		—		12			61
Total construction loans	49		—		—		12			61
Credit cards	205		—		—		29			234
Total loans	$	24,739	$	3,467	$	7	$	3,758		$	25,037

(in thousands)	Three Months Ended June 30, 2014
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	13,233	$	332	$	53	$	426		$	13,380
Life sciences	3,403		409		—		2,180			5,174
Asset-based loans	877		—		—		486			1,363
Venture capital/private equity	106		—		—		37			143
SBA and USDA	557		—		—		57			614
Other	9		—		—		2			11
Total commercial loans	18,185		741		53		3,188			20,685
Real estate loans:
SBA and USDA	703		—		—		(1		)	702
Total real estate loans	703		—		—		(1		)	702
Construction:
SBA and USDA	57		—		—		(38		)	19
Total construction loans	57		—		—		(38		)	19
Credit cards	149		—		—		1			150
Total loans	$	19,094	$	741	$	53	$	3,150		$	21,556

16

(in thousands)	Six Months Ended June 30, 2015
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	11,904	$	3,691	$	392	$	5,854		$	14,459
Life sciences	3,657		1,961		—		2,212			3,908
Asset based loans	3,364		938		—		(265		)	2,161
Venture capital/private equity	250		—		—		124			374
SBA and USDA	622		64		1		63			622
Other	1,576		246		—		1,189			2,519
Total commercial loans	21,373		6,900		393		9,177			24,043
Real estate loans:
SBA and USDA	1,310		567		—		(44		)	699
Total real estate loans	1,310		567		—		(44		)	699
Construction:
SBA and USDA	43		—		—		18			61
Total construction loans	43		—		—		18			61
Credit cards	180		—		—		54			234
Total loans	$	22,906	$	7,467	$	393	$	9,205		$	25,037

(in thousands)	Six Months Ended June 30, 2014
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	13,609	$	2,166	$	156	1,781			$	13,380
Life sciences	1,971		409		—		3,612			5,174
Asset based loans	684		—		—		679			1,363
Venture capital/private equity	197		—		—		(54		)	143
SBA and USDA	627		128		—		115			614
Other	2		—		—		9			11
Total commercial loans	17,090		2,703		156		6,142			20,685
Real estate loans:
SBA and USDA	1,163		390		—		(71		)	702
Total real estate loans	1,163		390		—		(71		)	702
Construction:
SBA and USDA	10		—		—		9			19
Total construction loans	10		—		—		9			19
Credit cards	116		—		—		34			150
Total loans	$	18,379	$	3,093	$	156	$	6,114		$	21,556

17

The following tables summarize the allowance for loan losses individually and collectively evaluated for impairment at June 30, 2015 and December 31, 2014, broken out by portfolio segment:

(in thousands)	June 30, 2015
	Ending Balance: Individually Evaluated for Impairment		Ending Balance: Collectively Evaluated for Impairment
Commercial loans
Technology	$	5,385	$	9,074
Life sciences	313		3,595
Asset based loans	—		2,161
Venture capital/private equity	—		374
SBA and USDA	—		622
Other	2,467		52
Total commercial loans	8,165		15,878
Real estate loans:
SBA and USDA	18		681
Total real estate loans	18		681
Construction:
SBA and USDA	—		61
Total construction loans	—		61
Credit cards	—		234
Total loans	$	8,183	$	16,854

(in thousands)	December 31, 2014
	Ending Balance: Individually Evaluated for Impairment		Ending Balance: Collectively Evaluated for Impairment
Commercial loans
Technology	$	4,523	$	7,381
Life sciences	1,181		2,476
Asset based loans	280		3,084
Venture capital/private equity	—		250
SBA and USDA	46		576
Other	1,564		12
Total commercial loans	7,594		13,779
Real estate loans:
SBA and USDA	510		800
Total real estate loans	510		800
Construction:
SBA and USDA	—		43
Total construction loans	—		43
Credit cards	—		180
Total loans	$	8,104	$	14,802

18

Credit Quality

The following table summarizes the aging of gross loans, broken out by portfolio segment, at June 30, 2015 and December 31, 2014. See Note 2 to the Consolidated Financial Statements in the Company's 2014 Form 10-K for a discussion of credit quality indicators.

(in thousands)	June 30, 2015
	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Loans Past Due		Current		Total Loans		Loans 90+ Days Past Due Still Accruing
Commercial loans:
Technology	$	2,381	$	2,289	$	1,200	$	5,870	$	733,146	$	739,016	$	—
Life sciences	—		—		—		—		307,240		307,240		—
Asset-based loans	—		—		—		—		143,204		143,204		—
Venture capital/private equity	—		—		—		—		216,268		216,268		—
SBA and USDA	—		—		539		539		36,387		36,926		—
Other	—		—		—		—		14,062		14,062		—
Total commercial loans	2,381		2,289		1,739		6,409		1,450,307		1,456,716		—
Real estate loans:
SBA and USDA	—		385		1,754		2,139		35,856		37,995		—
Total real estate loans	—		385		1,754		2,139		35,856		37,995		—
Construction loans:
SBA and USDA	—		—		—		—		6,752		6,752		—
Total construction loans	—		—		—		—		6,752		6,752		—
Credit cards	—		—		—		—		23,379		23,379		—
Total loans, gross	$	2,381	$	2,674	$	3,493	$	8,548	$	1,516,294	$	1,524,842	$	—

(in thousands)	December 31, 2014
	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Loans Past Due		Current		Total Loans		Loans 90+ Days Past Due Still Accruing
Commercial loans:
Technology	$	—	$	—	$	—	$	—	$	631,979	$	631,979	$	—
Life sciences	—		—		—		—		274,057		274,057		—
Asset-based loans	—		—		—		—		177,701		177,701		—
Venture capital/private equity	—		—		—		—		169,143		169,143		—
SBA and USDA	—		—		175		175		35,434		35,609		—
Other	3,245		—		—		3,245		3,609		6,854		—
Total commercial loans	3,245		—		175		3,420		1,291,923		1,295,343		—
Real estate loans:
SBA and USDA	—		—		408		408		36,570		36,978		—
Total real estate loans	—		—		408		408		36,570		36,978		—
Construction loans:
SBA and USDA	—		—		—		—		4,035		4,035		—
Total construction loans	—		—		—		—		4,035		4,035		—
Credit cards	—		—		—		—		17,980		17,980		—
Total loans, gross	$	3,245	$	—	$	583	$	3,828	$	1,350,508	$	1,354,336	$	—

19

The following tables summarize impaired loans as they relate to allowance for loan losses, broken out by portfolio segment, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Allowance for loan losses related to impaired loans		Impaired loans with related allowance for loan losses		Impaired loans with no related allowance for loan losses		Recorded investment in impaired loans		Total of unpaid principal of impaired loans
Commercial loans:
Technology	$	5,385	$	8,792	$	1,200	$	9,992	$	10,507
Life Sciences	313		1,911		—		1,911		1,976
SBA and USDA	—		—		539		539		611
Other	2,467		3,343		—		3,343		3,409
Total commercial loans	8,165		14,046		1,739		15,785		16,503
Real estate loans:
SBA and USDA	18		385		1,767		2,152		2,745
Total real estate loans	18		385		1,767		2,152		2,745
Total loans, gross	$	8,183	$	14,431	$	3,506	$	17,937	$	19,248

(in thousands)	December 31, 2014
	Allowance for loan losses related to impaired loans		Impaired loans with related allowance for loan losses		Impaired loans with no related allowance for loan losses		Recorded investment in impaired loans		Total of unpaid principal of impaired loans
Commercial loans:
Technology	$	4,523	$	8,757	$	730	$	9,487	$	10,398
Life Sciences	1,181		2,511		—		2,511		4,140
Asset-based loans	280		570		—		570		570
SBA and USDA	46		175		—		175		183
Other	1,564		3,245		—		3,245		3,261
Total commercial loans	7,594		15,258		730		15,988		18,552
Real estate loans:
SBA and USDA	510		1,251		—		1,251		1,261
Total real estate loans	510		1,251		—		1,251		1,261
Total loans, gross	$	8,104	$	16,509	$	730	$	17,239	$	19,813

20

The following table summarizes average impaired loans, broken out by portfolio segment, during the three and six months ended June 30,2015 and 2014:

(in thousands)	Three Months Ended June 30,
	2015				2014
	Average recorded investment in impaired loans		Interest income recognized		Average recorded investment in impaired loans		Interest income recognized
Commercial loans:
Technology	$	13,620	$	—	$	8,159	$	—
Life sciences	2,311		—		2,214		—
Asset-based loans	334		—		—		—
SBA and USDA	550		—		624		—
Other	3,337		—		—		—
Total commercial loans	20,152		—		10,997		—
Real estate loans:
SBA and USDA	2,872		—		1,283		—
Total real estate loans	2,872		—		1,283		—
Credit cards	—		—		—		—
Total loans, gross	$	23,024	$	—	$	12,280	$	—

(in thousands)	Six Months Ended June 30,
	2015				2014
	Average recorded investment in impaired loans		Interest income recognized		Average recorded investment in impaired loans		Interest income recognized
Commercial loans:
Technology	$	9,008	$	—	$	7,572	$	—
Life sciences	1,746		—		1,375		—
Asset-based loans	312		—		—		—
SBA and USDA	301		—		717		—
Other	2,882		—		—		—
Total commercial loans	14,249		—		9,664		—
Real estate loans:
SBA and USDA	1,465		—		1,283		—
Total real estate loans	1,465		—		1,283		—
Credit cards	—		—		10		—
Total loans, gross	$	15,714	$	—	$	10,957	$	—

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The following table summarizes the credit quality indicators, broken out by portfolio segment, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Pass		Performing (Criticized)		Impaired		Total
Commercial loans:
Technology	$	693,726	$	35,298	$	9,992	$	739,016
Life sciences	293,746		11,583		1,911		307,240
Asset-based loans	128,946		14,258		—		143,204
Venture capital/private equity	216,268		—		—		216,268
SBA and USDA	32,175		4,212		539		36,926
Other	10,719		—		3,343		14,062
Total commercial loans	1,375,580		65,351		15,785		1,456,716
Real estate loans:
SBA and USDA	35,843		—		2,152		37,995
Total real estate loans	35,843		—		2,152		37,995
Construction loans:
SBA and USDA	6,752		—		—		6,752
Total construction loans	6,752		—		—		6,752
Credit cards	23,379		—		—		23,379
Total loans, gross	$	1,441,554	$	65,351	$	17,937	$	1,524,842

(in thousands)	December 31, 2014
	Pass		Performing (Criticized)		Impaired		Total
Commercial loans:
Technology	$	575,483	$	47,009	$	9,487	$	631,979
Life sciences	257,143		14,403		2,511		274,057
Asset-based loans	160,558		16,573		570		177,701
Venture capital/private equity	169,143		—		—		169,143
SBA and USDA	35,040		394		175		35,609
Other	3,609		—		3,245		6,854
Total commercial loans	1,200,976		78,379		15,988		1,295,343
Real estate loans:
SBA and USDA	29,613		6,114		1,251		36,978
Total real estate loans	29,613		6,114		1,251		36,978
Construction loans:
SBA and USDA	4,035		—		—		4,035
Total construction loans	4,035		—		—		4,035
Credit cards	17,980		—		—		17,980
Total loans, gross	$	1,252,604	$	84,493	$	17,239	$	1,354,336

Troubled debt restructurings (“TDRs”)

Uncollateralized loans are measured for impairment based on the present value of expected future cash flows, discounted at the historical effective interest rate, while all collateral-dependent loans are measured for impairment based on the fair value of the collateral.

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The following table summarizes the Company's loans classified as TDRs, broken out by portfolio segment, during the three and six months ended June 30,2015:

(dollars in thousands)	Three Months Ended June 30, 2015
	Modifications					TDRs That Subsequently Defaulted
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts	Recorded Investment
Commercial loans:
Technology	—	$	—	$	—	—	$	—
Life Sciences	—	—		—		1	600
Other	1	3,343		3,343		—	—
Total commercial loans	1	3,343		3,343		1	600
Total loans, gross	1	$	3,343	$	3,343	1	$	600

(dollars in thousands)	Six Months Ended June 30, 2015
	Modifications					TDRs That Subsequently Defaulted
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts	Recorded Investment
Commercial loans:
Technology	—	$	—	$	—	1	$	366
Life Sciences	—	—		—		1	600
Other	1	3,343		3,343		—	—
Total commercial loans	1	3,343		3,343		2	966
Total loans, gross	1	3,343		3,343		2	966

The loan identified as a TDR during the three and six months ended June 30,2015, was restructured to defer interest payments. The loan is considered a nonperforming loan and, as such, was individually considered for allowance for loan losses calculations. There were no modifications of TDRs during the three and six months ended June 30,2014.

The Bank currently has no commitments to lend to borrowers with loans identified as TDRs.

5. INTANGIBLE ASSETS

The Bank recognizes servicing right intangibles related to obligations to service financial assets. See Note 15 for information about the Company's servicing assets. The Bank acquired certain intangible assets, consisting of non-compete agreements and existing customer relationships, as part of its acquisition of Sand Hill Finance LLC on December 31, 2013. The non-compete agreements and existing customer relationships are finite-lived intangible assets subject to amortization. The non-compete agreements intangible asset had a one-year amortization period and the existing customer relationships intangible asset has a three-year amortization period. The acquired intangible assets do not have renewal or extension provisions.

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The Company's finite-lived intangible assets at June 30, 2015 and December 31, 2014, are as follows:

(in thousands)	June 30, 2015			December 31, 2014
Non-compete agreements	$	210		$	210
Existing customer relationships	590			590
Total gross carrying amounts	800			800
Accumulated amortization - non-compete agreements	(210		)	(210		)
Accumulated amortization - existing customer relationships	(295		)	(197		)
Total accumulated amortization	(505		)	(407		)
Total intangible assets subject to amortization, net	$	295		$	393

Amortization expense, net of tax for the three and six months ended June 30,2015, amounted to $30 thousand and $62 thousand, respectively. Amortization expense, net of tax for the three and six months ended June 30,2014, amounted to $62 thousand and $125 thousand, respectively. Amortization expense, net of tax is included in other noninterest expense on the accompanying consolidated statements of income.

The following table shows the expected amortization for the next five years for intangible assets at June 30,2015:

(in thousands)
2015	99
2016	196
	$	295

6. DEPOSITS

Time deposits in denominations of $100,000 or more were approximately $9.2 million and $16.0 million at June 30, 2015 and December 31, 2014, respectively. Interest expense paid on time deposits individually exceeding $100,000 totaled $3 thousand and $8 thousand for the three and six months ended June 30,2015, respectively. Interest expense paid on time deposits individually exceeding $100,000 totaled $16 thousand and $30 thousand for the three and six months ended June 30,2014, respectively. At June 30, 2015, time deposits scheduled to mature on or before June 30,2016, totaled $8.2 million. The remaining $1.0 million is scheduled to mature in 2017. At June 30,2015 and December 31, 2014, the aggregate amount of overdrawn demand deposits reclassified to loans was $0.1 million and $0.9 million, respectively.

7. REPURCHASE AGREEMENTS AND REVERSE REPURCHASE AGREEMENTS

Securities purchased under agreements to resell generally mature within one to four days from the transaction date. The Company had no reverse repurchase agreements outstanding at June 30, 2015 or December 31, 2014.

Securities sold under agreements to repurchase generally mature within one to four days from the transaction date. Securities sold under agreements to repurchase are reflected at the amount of cash received in connection with the transaction. The Company may be required to provide additional collateral based on the fair value of the underlying securities. The Company had no repurchase agreements outstanding at June 30, 2015 or December 31, 2014.

8. BORROWINGS

The Company may purchase federal funds through unsecured federal funds lines of credit totaling $60.0 million. These lines of credit are intended for short-term borrowings and are subject to restrictions limiting the frequency and terms of advances. These lines of credit are payable on demand and bear interest based upon the daily federal funds rate. The Company also has the ability to utilize short-term borrowings from the Federal Reserve Bank with interest based upon the Federal Reserve US Primary Credit Discount Rate. This $83.4 million line is secured by loans and investment securities. There were no outstanding borrowings for these lines at June 30, 2015 and December 31, 2014.

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In addition, the Company has the ability to borrow longer term from the Federal Home Loan Bank ("FHLB"), with a $250.4 million line of credit available. The rate on these advances varies based on borrowing terms. Advances from this line of credit must be adequately collateralized with securities. There were no outstanding borrowings for this line at June 30, 2015 and December 31, 2014.

In September 2008, the Company issued $7.4 million of convertible trust preferred securities. These securities were placed through Square 1 Financial Capital Trust I (the “Trust”), a Delaware trust that was formed by the Company, as sponsor, in order to facilitate the issuance of convertible trust preferred securities. The Trust held, as its sole asset, the subordinated debentures issued by the Company. The Company did not consolidate the Trust into its consolidated financial statements. The subordinated debentures issued by the Company amounted to $7.6 million. A debt discount of $1.5 million was recorded and was to be amortized over 30 years.

In 2014, the Company notified the holders of all trust preferred securities of its intent to redeem such securities as of June 30, 2014. All outstanding trust preferred securities were converted by the holders into shares of Company common stock prior to that date and the Trust was dissolved. During the three and six months ended June 30,2014, investors converted $3.7 million and $7.4 million, respectively, of the outstanding convertible trust preferred securities into 366,500 Class A common shares and 741,500 Class A common shares, respectively, at $10.00 per share. For the three and six months ended June 30,2014, interest expense on the trust preferred securities was $56 thousand and $215 thousand, respectively.

9. EQUITY

Preferred Stock

In December 2008, the Company issued 5,000 shares of Series A, 5% Fixed Rate Cumulative Convertible Preferred Stock. Dividends were paid quarterly, in arrears. The preferred stock was convertible into shares of the Company’s common stock at the option of the holder and had a conversion price of $10.00 per share. On April 2, 2014, all shares of preferred stock were converted by the holder into 500,070 shares of common stock.

Issuances of Common Stock

During the three months ended June 30,2015 and 2014, the Company issued 3,139 shares and 2,290 shares, respectively, of common stock related to vesting of restricted stock units issued under the Company's stock-based incentive compensation plan, and issued 93,925 shares and 78,600 shares, respectively, of common stock related to the exercise of stock options issued under the stock-based incentive compensation plan. During the six months ended June 30,2015 and 2014, the Company issued 49,600 shares and 42,330 shares, respectively, of common stock related to vesting of restricted stock units issued under the Company's stock-based incentive compensation plan, and issued 319,078 shares and 118,730 shares, respectively, of common stock related to the exercise of stock options issued under the stock-based incentive compensation plan.

In 2005, the Company's organizers received warrants to purchase one additional share of common stock for every share of common stock purchased. These warrants expire 10 years after issuance. At June 30, 2015 and December 31, 2014, there were 4,000 warrants and 30,000 warrants outstanding, respectively, with an exercise price of $10.00 per share. During the three and six months ended June 30,2015, the Company issued 26,000 shares of common stock related to the exercise of a portion of the outstanding warrants. During the three and six months ended June 30,2014, the Company issued 28,000 shares and 32,000 shares of common stock related to the exercise of a portion of the outstanding warrants.

On March 31, 2014, the Company sold a total of 3,125,000 shares of Class A common stock in its initial public offering at an initial public offering price of $18.00 and received net proceeds of $51.1 million after expenses. On April 1, 2014, the underwriters exercised in full the underwriters’ purchase option granted in connection with the initial public offering, at the initial public offering price of $18.00, resulting in an additional 468,750 shares purchased from the Company for which it received $7.9 million in net proceeds on April 4, 2014.

During the three and six months ended June 30,2014, the Company issued shares of its Class A common stock in connection with the conversion of the outstanding convertible trust preferred securities into common shares (see Note 8).

In 2010, in connection with a private placement of Company common stock, the Company issued warrants to purchase 750,000 shares of common stock at any time. The exercise price of the warrants was $5.15 per share. In February 2015, all of the warrants were net exercised for 603,436 shares of common stock. These warrants were originally valued at $1.8

25

million using a Black-Scholes-Merton fair value model and are included in additional paid in capital in the accompanying consolidated balance sheet at December 31, 2014.

Earnings Per Share

Basic and diluted earnings per share are computed based on the weighted average number of shares outstanding during each period. Diluted earnings per share reflects the potential dilution that could occur if convertible preferred stock, convertible trust preferred securities, stock options or warrants were exercised, resulting in the issuance of common stock that then shared in the net income of the Company.

Basic and diluted earnings per common share are calculated as follows:

(in thousands except per share data)		Three Months Ended   June 30,				Six Months Ended   June 30,
		2015		2014		2015		2014
Basic:
Net income		$	9,919	$	8,051	$	18,072	$	15,899
Less:	dividends on preferred stock	—		1		—		63
Net income attributable to common shares		9,919		8,050		18,072		15,836
Basic weighted-average common shares outstanding		29,825		28,333		29,549		26,042
Earnings per share—basic		$	0.33	$	0.28	$	0.61	$	0.61
Diluted:
Net income attributable to common shares		$	9,919	$	8,050	$	18,072	$	15,836
Plus:	dividends on preferred stock	—		1		—		63
	convertible trust preferred securities	—		39		—		148
Net income attributable to common shares after assumed conversions		9,919		8,090		18,072		16,047
Basic weighted-average common shares outstanding		29,825		28,333		29,549		26,042
Effect of dilutive stock options and warrants		670		1,331		842		1,711
Diluted weighted-average common shares outstanding		30,495		29,664		30,391		27,753
Earnings per share—diluted		$	0.33	$	0.27	$	0.60	$	0.58

Accumulated Other Comprehensive Income (Loss)

The Company’s only components of accumulated other comprehensive income (loss) relate to unrealized gains and losses on available for sale securities and their related tax effects. Reclassification adjustments out of accumulated other comprehensive income for the three and six months ended June 30,2015 and 2014 are presented in the following table:

(in thousands)		Three Months Ended June 30,						Six Months Ended   June 30,
	Location	2015			2014			2015			2014
Reclassification adjustment for gains included in net income	Net gain (loss) on securities	$	(1,396	)	$	(80	)	$	(1,021	)	$	(80	)
Related tax expense	Income tax expense	523			30			383			30
Reclassification adjustment for gains included in net income, net of tax		$	(873	)	$	(50	)	$	(638	)	$	(50	)

10. INCOME TAXES

The Company and its subsidiaries file a consolidated U.S. federal income tax return. The Company is no longer subject to the assessment of tax with respect to returns that have been filed for years prior to 2009. The Company's effective tax rate is lower than the federal statutory rate primarily as a result of the Company's portion of income from non-taxable investments.

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Realization of the Company’s net deferred tax assets is dependent upon the Company generating sufficient taxable income in future years to obtain a benefit from the reversal of deductible temporary differences and from tax loss carry-forwards. The Company has concluded that, based on expected future results and the future reversals of existing taxable temporary differences, it is more likely than not that its deferred tax assets will be realized, except for a $0.3 million valuation allowance for North Carolina. The Company’s net operating loss carry-forwards will begin to expire in 2029.

The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. At June 30, 2015 and December 31, 2014, the Company did not record a liability for uncertain tax positions because no material positions existed.

The Company classifies tax related interest and penalties as a component of income taxes. Interest and penalties for all periods presented were immaterial.

11. REGULATORY MATTERS AND RESTRICTIONS

The Company and the Bank are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios, as set forth in the table below. Management believes that at June 30, 2015, the Company and the Bank met all capital requirements to which they are subject and are “well-capitalized”.

On January 1, 2015, the Basel III regulatory standard on bank capital adequacy became effective. The rule establishes a new Common Equity Tier 1 minimum capital requirement (4.5% of risk-weighted assets), increases the minimum Tier 1 capital to risk-based assets requirement (from 4.0% to 6.0% of risk-weighted assets), and requires institutions to hold 8.0% total capital and 4.0% Tier 1 capital to average consolidated assets (“Leverage Ratio”). It also increases the Tier 1 capital to risk-based assets threshold ratio for "well capitalized" from 6.0% to 8.0% or risk-weighted assets.

The Bank, as a North Carolina banking corporation, may pay dividends only out of undivided profits as determined pursuant to North Carolina General Statutes Section 53-87. Regulatory authorities may further limit payment of dividends by any bank when it is determined that such a limitation is in the public interest and is necessary to ensure financial soundness of the bank.

The Company’s actual capital amounts and ratios at June 30, 2015 and December 31, 2014, and the minimum capital requirements, are presented in the following table:

(dollars in thousands)
	Minimum Requirements to be:
COMPANY	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital ratio	$	344,658	13.12	%	$	210,097	8.00	%	$	262,621	10.00	%
Tier 1 risk-based capital ratio	317,608		12.09		157,572		6.00		210,097		8.00
Common equity Tier 1 capital ratio	317,608		12.09		118,179		4.50		170,703		6.50
Tier 1 leverage ratio	317,608		9.07		140,118		4.00		175,148		5.00
December 31, 2014
Total risk-based capital ratio	$	318,344	14.95	%	$	170,340	8.00	%	$	212,925	10.00	%
Tier 1 risk-based capital ratio	294,441		13.83		85,170		4.00		127,755		6.00
Tier 1 leverage ratio	294,441		9.71		121,289		4.00		151,611		5.00

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The Bank’s actual capital amounts and ratios at June 30, 2015 and December 31, 2014, and the minimum capital requirements, are presented in the following table:

(dollars in thousands)
	Minimum Requirements to be:
BANK	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital ratio	$	335,229	12.82	%	$	209,186	8.00	%	$	261,483	10.00	%
Tier 1 risk-based capital ratio	308,179		11.79		156,890		6.00		209,186		8.00
Common equity Tier 1 capital ratio	308,179		11.79		117,667		4.50		169,964		6.50
Tier 1 leverage ratio	308,179		8.82		139,787		4.00		174,733		5.00
December 31, 2014
Total risk-based capital ratio	$	309,928	14.61	%	$	169,752	8.00	%	$	212,190	10.00	%
Tier 1 risk-based capital ratio	286,025		13.48		84,876		4.00		127,314		6.00
Tier 1 leverage ratio	286,025		9.44		121,186		4.00		151,483		5.00

12. RETIREMENT PLAN

The Company approved in January 2006 the establishment of an employee benefit plan (the “Plan”) pursuant to Section 401(k) of the Internal Revenue Code for the benefit of its employees. The Plan includes provisions for discretionary employee contributions, subject to limitation under the Internal Revenue Code. Under the Plan, employees may contribute up to an annual maximum as determined by the Internal Revenue Code. During 2015 and 2014, the Company matched 100% of the first 3% of employee contributions and 50% on contributions between 3-5%. The expense related to the plan for the three and six months ended June 30,2015 amounted to $0.3 million and $0.7 million, respectively. The expense related to the plan for the three and six months ended June 30,2014 amounted to $0.2 million and $0.6 million, respectively.

13. STOCK-BASED COMPENSATION PLAN

The Company maintains a stock-based incentive compensation plan covering certain officers, directors and employees. Grants of options are made by the Compensation Committee of the Board of Directors. Excluding minimal exceptions, all grants must be at no less than fair market value on the date of grant, must be exercised no later than seven years from the date of grant, and may be subject to some vesting provisions. Grants generally vest over five years from the date of grant. The 2009 Stock Incentive Plan, as amended, provides for the issuance of up to 2,820,542 restricted stock units and options to purchase shares of the Company’s stock. At June 30, 2015, 932,818 shares of common stock remained available for future issuance through stock options or restricted stock units.

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The following table presents a rollforward of the Company’s stock options outstanding during the six months ended June 30,2015:

					Weighted Average Remaining Contractual Life in Years
	Shares		Weighted Average Exercise Price
Outstanding at beginning of period	1,175,675		$	6.12	3.37
Granted	—		—
Exercised	(325,986	)	6.07
Forfeited	(660	)	6.00
Outstanding at end of period	849,029		$	6.14	3.97
Options exercisable at period end	533,319		$	6.07	3.94

The following table provides information for restricted stock units issued under the stock-based incentive compensation plan during the six months ended June 30,2015:

	Shares		Weighted Average Grant Date Fair Value
Nonvested at beginning of period	376,372		$	10.01
Granted	101,548		26.22
Vested	(70,210	)	17.01
Forfeited	(13,626	)	9.83
Nonvested at end of period	394,084		$	12.94

The Company’s pre-tax compensation cost for stock-based employee compensation was $0.9 million and $2.2 million, respectively, for the three and six months ended June 30,2015. The Company’s pre-tax compensation cost for stock-based employee compensation was $0.7 million and $1.7 million, respectively, for the three and six months ended June 30,2014. At June 30, 2015, there was $4.2 million of unrecognized compensation cost related to non-vested stock-based compensation under this plan to be recognized over five years.

14. DERIVATIVES

The Company receives equity warrants with net settlement terms in connection with extending loan commitments to certain of its customers. These warrants are obtained at the inception of a loan facility or the amendment of a loan facility. These warrants are not obtained in lieu of other fees, interest or payments. These warrants potentially provide an additional return, in addition to the traditional loan yield from interest and fees, in the event of a liquidity event of the borrowing company. The Company holds these equity warrants for future investment gains, rather than to hedge economic risks. In general, the equity warrants entitle the Company to buy a specific number of shares of the customer’s stock at a specific price over a specific time period. The warrants may also include contingent provisions which provide for additional shares to be purchased at a specific price if defined future events occur, such as future rounds of equity financing by the customer, or upon additional borrowings by the customer. All of the Company’s equity warrants contain net share settlement provisions, which permit the customer to deliver to the Company, upon the Company’s exercise of the warrant, the amount of shares with a current fair value equal to the net gain under the warrant agreement.

ASC 815 Derivatives and Hedging requires that all derivative instruments be recorded on the balance sheet at fair value. Equity warrants with net share settlement provisions are considered derivatives. The Company's equity warrants portfolio is primarily comprised of holdings in non-public companies and the Company’s practice generally is to monetize its positions as soon as a liquidity event occurs. Often there is a lock-up period requiring the Company to hold its equity position in a publicly traded security until the expiration of the lock-up period. The Company estimates the initial fair value of non-public company equity warrants using a Black-Scholes option pricing model to approximate fair market value. The model estimates market value for each warrant based on the most recent equity offering at the time of issuance, the warrant specific exercise price, the warrant’s expected life, a risk-free interest rate based on a duration matched U.S. Treasury rate and volatility factors derived from indices of comparable publicly traded companies. On a monthly basis, the Company

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adjusts the value of equity warrants in non-public companies using a Black-Scholes model to approximate fair market value based on changes to the risk-free interest rate, the volatility rate and the warrant’s expected life.

The Company also holds warrants in public companies. When a private company goes public there is often a lock-up period requiring the Company to hold its equity position in a publicly traded security until the expiration of the lock-up period. The Company adjusts the value of equity warrants in public companies on a monthly basis based on the month-end closing stock price adjusted for the option value of the warrant. The model estimates market value for each warrant based on the share price as of the evaluation date, the warrant specific exercise price, the warrant’s expected life, a risk-free interest rate based on a duration matched U.S. Treasury rate and uses a company specific volatility factor. See Note 15 for further information regarding the fair value of the Company's equity warrants. Any changes from the grant date in the fair value of equity warrant assets will be recognized as increases or decreases to warrant valuation and as unrealized gains or losses in non-interest income. When a portfolio company completes an initial public offering on a publicly reported market or is acquired, the Company may exercise these equity warrant assets for shares or cash. Shares received from the exercise of warrants and subject to lock-up agreements are held as equity securities in the Company's available for sale portfolio.

The grant date fair values of equity warrants received in connection with extending loan commitments are considered to be loan fees and are recognized over the life of the loan commitment as an adjustment to loan yield through loan interest income. At June 30, 2015 and December 31, 2014, unearned income on loans included $2.2 million and $2.0 million, respectively, related to the initial valuation of equity warrant assets. For the three and six months ended June 30,2015, the Company recognized $0.6 million and $1.0 million, respectively, in income from the amortization of loan fees related to the initial valuation of equity warrant assets. For the three and six months ended June 30,2014, the Company recognized $0.3 million and $0.6 million, respectively, in income from the amortization of loan fees related to the initial valuation of equity warrant assets.

Warrants held, which amounted to $5.1 million and $4.3 million in 484 and 461 companies at June 30, 2015 and December 31, 2014, respectively, are shown as warrant valuation in the accompanying consolidated balance sheets. At June 30, 2015, included in the $5.1 million in equity warrant assets in 484 companies are $0.6 million of equity warrant assets held in nine publicly traded companies. At December 31, 2014, included in the $4.3 million in equity warrant assets in 461 companies are $0.2 million of equity warrant assets held in six publicly traded companies.

During the three months ended June 30,2015, the Company did not exercise any warrants for equity securities. During the three months ended June 30,2015, the Company monetized equity securities for $0.1 million in proceeds following the expiration of their applicable lock-up periods. These equity securities had an initial value of $0.1 million. The Company had obtained these equity securities through the exercise of warrants in two public companies.

During the six months ended June 30,2015, the Company exercised warrants with a total value of $33 thousand and received equity securities in one publicly traded company. During the six months ended June 30,2015, the Company monetized equity securities for $0.9 million in proceeds following the expiration of their applicable lock-up periods. These equity securities had an initial value of $1.2 million and the Company recognized a loss of $0.3 million. The Company had obtained these equity securities through the exercise of warrants in four public companies.

During the three and six months ended June 30,2014, the Company exercised warrants with a total value of $1.4 million and received equity securities in four publicly traded companies of which one was monetized for $0.3 million. During the three and six months ended June 30,2014, the Company exited $0.8 million in warrants in one publicly traded company and $0.8 million in warrants in warrants in three publicly traded companies, respectively.

At June 30, 2015 and December 31, 2014, the fair value of equity securities included in investments obtained through the exercise of warrants and still held was $0.1 million and $0.9 million, respectively (see Note 3).

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The following table presents gains and losses on equity warrant exercises and the number of companies on which warrants were exercised, broken out by stage of emerging companies:

(in thousands except number of companies)	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Equity warrant assets:
Gains:
Early stage	$	60		$	889		$	206		$	1,030
Expansion stage	90			1,144			197			1,534
Late stage	10			127			496			454
Total gains on exercise of equity warrant assets	160			2,160			899			3,018
Losses:
Expansion stage	—			(2		)	—			(2		)
Late stage	(4		)	—			(4		)	—
Total losses on exercise of equity warrant assets (1)	(4		)	(2		)	(4		)	(2		)
Net gains on exercise of equity warrant assets	156			2,158			895			3,016
Non-monetized write off of warrant assets	(66		)	(97		)	(125		)	(176		)
Net realized gains on equity warrants	90			2,061			770			2,840
Change in fair value of equity warrant assets	149			(2,040		)	(69		)	(624		)
Warrant income	$	239		$	21		$	701		$	2,216
Number of companies on which warrant gains were realized:
Early stage	4			6			9			11
Expansion stage	8			12			14			17
Late stage	1			2			6			5
Total number of companies	13			20			29			33

(1) Realized warrant losses for the three and six months ended June 30,2015 related to one late stage company. Realized warrant losses for the three and six months ended June 30,2014 related to one expansion stage company.

15. FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

Fair Value Measurements

The Company's marketable investment securities and derivative instruments are financial instruments recorded at fair value on a recurring basis. The Company makes estimates regarding valuation of assets and liabilities measured at fair value in preparing its consolidated financial statements. ASC 825-10 provides an option to report selected financial assets and liabilities at fair value. The Company has not elected to measure any financial assets or liabilities using the fair value option under ASC 825-10.

ASC 820, Fair Value Measurements and Disclosures defines fair value as the price that would be received to sell an asset or paid to transfer a liability (the “exit price”) in an orderly transaction between market participants at the measurement date. Fair value is a market-based measurement considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measurement.

ASC 820 establishes a three-level hierarchy for disclosure of assets and liabilities recorded at fair value. The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company's estimates about market data.

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The three levels for measuring fair value are based on the reliability of inputs and are as follows:

Level 1 Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Valuation adjustments and block discounts are not applied to instruments utilizing Level 1 inputs. Since valuations are based on quoted prices that are readily available in an active market, valuation of these products does not entail a significant degree of judgment. Assets utilizing Level 1 inputs include exchange-traded equity securities.

Level 2

Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly. Assets and liabilities utilizing Level 2 inputs include: U.S. treasury and agency securities, mortgage-backed securities, collateralized mortgage obligations, commercial mortgage-backed securities, municipal bonds and notes, Over-the-Counter (“OTC”) derivative instruments (foreign exchange forwards and option contracts, interest rate swaps related to the Company's senior notes, subordinated notes and junior subordinated debentures), and equity warrant assets for shares of public company capital stock.

Level 3

Valuations based on inputs that are unobservable and significant to the overall fair value measurement. Assets utilizing Level 3 inputs include: limited partnership interests in private equity funds, direct equity investments in private companies, mortgage-backed securities, and equity warrant assets for shares of private company capital stock.

For inactive markets, there is little information, if any, to evaluate if individual transactions are orderly. Accordingly, the Company is required to estimate, based upon all available facts and circumstances, the degree to which orderly transactions are occurring. Price quotes based upon transactions that are not orderly are not considered to be determinative of fair value and are given little, if any, weight in measuring fair value. Price quotes based upon transactions that are orderly are considered in determining fair value, with the weight given based upon the facts and circumstances. If sufficient information is not available to determine if price quotes are based upon orderly transactions, less weight is given to the price quote relative to other transactions that are known to be orderly.

To the extent that the 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 that the Company uses to determine 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 is determined is based on the lowest level input that is significant to the fair value measurement in its entirety.

Investment securities are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted market prices, if available. If quoted market prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions.

The types of instruments valued based on quoted market prices in active markets include the Company’s U.S. government and agency securities, mortgage-backed securities and asset-backed securities (“ABS”). Such instruments are generally classified within level 1 or level 2 of the fair value hierarchy. As required by ASC 820, the Company does not adjust the quoted price for such instruments.

Level 3 valuations are for instruments that are not traded in active markets or are subject to transfer restrictions, and may be adjusted to reflect illiquidity and/or non-transferability, with such adjustment generally based on available market evidence. In the absence of such evidence, management’s best estimate is used. Such instruments in this category include some investment securities, all impaired loans, warrants and foreclosed assets.

Transfers between fair value hierarchy levels would represent assets or liabilities that were previously categorized at a higher level for which the inputs to the estimate became less observable or classified at a lower level for which the inputs became more observable during the period. The Company's policy is to recognize transfers between levels at the end of the period.

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The following is a summary of the valuation methods and significant assumptions used to estimate fair value:

Available for sale securities

Valuations for the available-for-sale securities are provided by third party external pricing service providers. The Company reviews the methodologies used to determine the fair value, including understanding the nature and observability of the inputs used to determine the price. The Company obtains additional corroboration depending on the type of security, the frequency of trades of the security and the level of liquidity or depth of the market.

Following is a summary of the significant inputs used for each class of assets and liabilities:

U.S. pass-through government mortgages are evaluated based on benchmark curves as well as security set-ups, to be announced (TBA) market, and broker feeds. Fixed-rate Ginnie Mae pools backed by fixed rate reverse mortgages are evaluated based on prepayment speeds, cash flows, swap curves, spread adjustments, coupon and average life. New issue data, monthly payment information and collateral performance are also monitored.

U.S. government collateralized mortgage obligations are evaluated based on benchmark curves, security set-up, prepayment speeds, cashflow scenario analysis, supporting collateral identification and collateral performance. Adjustments are made for spread, yield, price and prepayment speeds. Volatility-driven, multi-dimensional spread tables as well as Option Adjusted Spread model applications are applied.

Non-agency mortgage evaluation methodology is based on security set-up, prepayment speeds, cashflow scenario analysis, benchmark comparisons and supporting collateral identification and performance. Depending on the characteristics of a given tranche, Option Adjust Spread model or multi-dimensional single cash flow stream model is applied.

Municipal bonds are evaluated based on stated coupon rates, final maturity dates, callable options and yield analysis including benchmark comparisons, yield to maturity and yield to worst. Adjustments are made for ratings updates and material event notices. Quotes are based on spreads to other municipal benchmark bonds with similar characteristics or relative to market rates on U.S. treasury bonds of similar maturity.

Corporate and trust preferred security methodology is based on security set up, benchmark comparisons, yield to maturity, issuer name, coupon rate, maturity date and any applicable issuer call option feature. An option adjusted spread model is used for issues that have early redemption features. Adjustments are made for corporate actions. The Floating Rate Note model is applied to variable rate note evaluations.

The methodology for fixed and floating rate asset backed securities is based on benchmark curves as well as security set-up, prepayment speeds, benchmark yields, spread adjustments, ratings updates, collateral performance and price history. Tranche level attributes, cash flows and market color (as available) are also monitored.

SBA pool evaluation methodology is determined by benchmark rates and swap curves, cashflow scenario analysis, coupon, maturity, and supporting collateral identification and collateral performance. The unique structures associated with SBA and SBIC programs are taken into account. Additional adjustments can be made based on the original and remaining terms, coupon, seasonality of the pools and default factors.

U.S. treasury securities are evaluated based on security set up, yield to maturity and through reviewing Treasury trading platform feeds (both active market makers and inter-dealer brokers) for consistency and outliers.

Equity warrant assets

Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on a modified Black-Scholes pricing model. The model uses the stock price of publicly-traded companies, stated exercise prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions for companies with 90 or more days of trading history. For public companies with less than 90 days of trading history, the iShares Russell Microcap index (IWC) is used to estimate volatility. Further, option expiration dates are modified to account for estimates to actual life relative to stated expiration.

Fair value measurements of equity warrant assets of private portfolio companies are priced based on a modified Black-Scholes option pricing model to estimate asset value by using stated exercise prices, option expiration dates, risk-free interest rates and option volatility assumptions. Option volatility assumptions used in the modified Black-Scholes model are based on the iShares Russell Microcap index (IWC). Option expiration dates are modified to account for estimates to actual life relative to stated expiration.

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Servicing asset

Valuation for the Company's servicing asset is provided by a third party external pricing service provider. The Company reviews the methodology used to determine the fair value, including understanding the nature and observability of the inputs used to determine the fair value. The valuation uses generated future cashflows for each asset based on the asset's unique characteristics, market-based assumptions for prepayment speeds and, in the case of non-guaranteed portions of SBA loans, losses and recoveries. The present value of the future cash flows are then calculated utilizing market-based discount rate assumptions. In all cases, each loan’s expected payment for each monthly period is modeled in order to create the most detailed cash flow stream possible.

Venture capital fund investments

To determine the estimated fair value of the Company's venture capital fund investments, the Company evaluates various factors related to the underlying private company entities. The factors are specific to each underlying private company. The factors evaluated include, but are not limited to, actual and forecasted results, cash position, and market comparable companies.

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The following tables present quantitative information about Level 3 fair value measurements:

(dollars in thousands)	June 30, 2015
	Fair Value		Valuation Technique	Unobservable Input	Weighted Average Range
Available for sale securities:
Corporates	$	3,011	Sensitivity analyses	Indicative pricing	(1)
Non-agency MBS	185,113		Volatility-driven, multi-dimensional spread tables, optional adjusted spread model and prepayment model	Indicative pricing	(1)
				Collateral performance	(1)
Other ABS	106,974		Multi-dimensional, collateral specific spread tables	Indicative pricing	(1)
				Collateral performance	(1)
Warrants	5,125		Modified Black-Scholes option pricing model	Volatility	19.5% - 127.2% (2)
				Risk-free interest rate	0.6% - 1.2% (2)
				Remaining life assumption	21.8% - 50.8% (2)
Servicing asset	1,450		Discounted cash flow	Discount rates	(1)
				Default rates	(1)
				Prepayment rates	(1)
				Servicing costs	(1)
Venture capital fund investments	4,232		Private company equity pricing	Actual and forecasted results, cash position, market comparable companies	(3)

(dollars in thousands)	December 31, 2014
	Fair Value		Valuation Technique	Unobservable Input	Weighted Average Range
Available for sale securities:
Non-agency MBS	$	173,099	Volatility-driven, multi-dimensional spread tables, optional adjusted spread model and prepayment model	Indicative pricing	(1)
				Collateral performance	(1)
Other ABS	47,621		Multi-dimensional, collateral specific spread tables	Indicative pricing	(1)
				Collateral performance	(1)
Warrants	4,304		Modified Black-Scholes option pricing model	Volatility	20.2% - 67.0% (2)
				Risk-free interest rate	1.2 % - 1.5% (2)
				Remaining life assumption	54.0% - 89.4% (2)
Servicing asset	1,222		Discounted cash flow	Discount rates	(1)
				Default rates	(1)
				Prepayment rates	(1)
				Servicing costs	(1)
Venture capital fund investments	3,704		Private company equity pricing	Actual and forecasted results, cash position, market comparable companies	(3)

(1) The Company uses third-party pricing information without adjustment for this Level 3 fair value measurement.

(2) Low end of range relates to private equity warrant assets portfolio and high end of range relates to public equity warrant assets portfolio.

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(3) The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

Following are tables that present information about the Company's investment securities, warrants, servicing asset, and venture capital fund investments, measured at fair value on a recurring basis:

(in thousands)	At June 30, 2015
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
Available for sale securities:
U.S. treasuries	$	159,501	$	—	$	—	$	159,501
Agency direct obligations	30,435		—		—		30,435
SBA pools	—		164,574		—		164,574
Agency MBS	—		674,285		—		674,285
Municipal bonds	—		98,931		—		98,931
Corporates	—		117,614		3,011		120,625
Non-agency MBS	—		—		185,113		185,113
Other ABS	—		—		106,974		106,974
Equity securities	904		—		—		904
Total available for sale securities	$	190,840	$	1,055,404	$	295,098	$	1,541,342
Warrants	$	—	$	—	$	5,125	$	5,125
Servicing asset	$	—	$	—	$	1,450	$	1,450
Venture capital fund investments	$	—	$	—	$	4,232	$	4,232

(in thousands)	At December 31, 2014
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
Available for sale securities:
U.S. treasuries	$	29,641	$	—	$	—	$	29,641
Agency direct obligations	30,631		—		—		30,631
SBA pools	—		179,822		—		179,822
Agency MBS	—		614,922		—		614,922
Municipal bonds	—		98,490		—		98,490
Corporates	—		118,359		—		118,359
Non-agency MBS	—		—		173,099		173,099
Other ABS	—		—		47,621		47,621
Equity securities	1,948		—		—		1,948
Total available for sale securities	$	62,220	$	1,011,593	$	220,720	$	1,294,533
Warrants	$	—	$	—	$	4,304	$	4,304
Servicing asset	$	—	$	—	$	1,222	$	1,222
Venture capital fund investments	$	—	$	—	$	3,704	$	3,704

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The following tables present additional information about Level 3 securities, venture capital fund investments, servicing assets and warrants, measured at fair value on a recurring basis:

(dollars in thousands)	Three Months Ended June 30, 2015
	Available for sale securities
	Corporates		Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at March 31, 2015	$	—	$	164,749		$	67,043		$	3,834		$	1,393		$	4,649		$	241,668
Transfers into Level 3	3,011		—			—			—			—			—			3,011
Transfers out of Level 3	—		—			—			—			—			(29		)	(29		)
Total gains (losses):
included in net income	—		—			—			337			(14		)	239			562
included in other comprehensive income	—		(12,688		)	(4,785		)	—			—			—			(17,473		)
Purchases, sales, issuances and settlements:
Purchases	—		47,787			46,009			231			—			—			94,027
Sales	—		(14,735		)	(1,293		)	—			—			(137		)	(16,165		)
Issuances	—		—			—			—			147			403			550
Settlements	—		—			—			(170		)	(76		)	—			(246		)
Balance at June 30, 2015	$	3,011	$	185,113		$	106,974		$	4,232		$	1,450		$	5,125		$	305,905

(dollars in thousands)	Three Months Ended June 30, 2014
	Available for sale securities
	Corporates			Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at March 31, 2014	$	29,391		$	66,651		$	24,605		$	3,958		$	1,298		$	6,596		$	132,499
Transfers into Level 3	—			—			—			—			—			—			—
Transfers out of Level 3	(23,389		)	—			—			(953		)	—			(1,369		)	(25,711		)
Total gains (losses):
included in net income	—			—			—			1,415			6			21			1,442
included in other comprehensive income	83			(2,773		)	(6,810		)	—			—			—			(9,500		)
Purchases, sales, issuances and settlements:
Purchases	—			23,759			16,252			170			—			—			40,181
Sales	—			(2,203		)	—			—			—			(994		)	(3,197		)
Issuances	—			—			—			—			55			493			548
Settlements	—			—			—			(257		)	(34		)	—			(291		)
Balance at June 30, 2014	$	6,085		$	85,434		$	34,047		$	4,333		$	1,325		$	4,747		$	135,971

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(dollars in thousands)	Six Months Ended June 30, 2015
	Available for sale securities
	Corporates		Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at December 31, 2014	$	—	$	173,099		$	47,621		$	3,704		$	1,222		$	4,304		$	229,950
Transfers into Level 3	3,011		—			—			—			—			—			3,011
Transfers out of Level 3	—		—			—			—			—			(38		)	(38		)
Total gains (losses):
included in net income	—		—			—			337			(9		)	701			1,029
included in other comprehensive income	—		(22,929		)	(8,252		)	—			—			—			(31,181		)
Purchases, sales, issuances and settlements:
Purchases	—		60,677			68,898			474			—			—			130,049
Sales	—		(25,734		)	(1,293		)	—			—			(942		)	(27,969		)
Issuances	—		—			—			—			331			1,100			1,431
Settlements			—			—			(283		)	(94		)	—			(377		)
Balance at June 30, 2015	$	3,011	$	185,113		$	106,974		$	4,232		$	1,450		$	5,125		$	305,905

(dollars in thousands)	Six Months Ended June 30, 2014
	Available for sale securities
	Corporates			Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at December 31, 2013	$	26,301		$	52,170		$	22,091		$	4,066		$	1,265		$	5,105		$	110,998
Transfers into Level 3	2,994			—			2,762			—			—			—			5,756
Transfers out of Level 3	(23,389		)	—			—			(953		)	—			(1,369		)	(25,711		)
Total gains (losses):
included in net income	—			—			—			1,415			18			2,216			3,649
included in other comprehensive income	179			(4,405		)	(7,058		)	—			—			—			(11,284		)
Purchases, sales, issuances and settlements:
Purchases	—			39,872			16,252			170			—			—			56,294
Sales	—			(2,203		)	—			—			—			(1,800		)	(4,003		)
Issuances	—			—			—			—			110			595			705
Settlements	—			—			—			(365		)	(68		)	—			(433		)
Balance at June 30, 2014	$	6,085		$	85,434		$	34,047		$	4,333		$	1,325		$	4,747		$	135,971

For the three and six months ended June 30,2015, one available for sale securities was transferred from Level 2 due to lack of observable inputs to substantiate a Level 2 valuation. For the three months ended June 30,2014, no available for sale securities were transferred from Level 2 due to lack of observable inputs to substantiate a Level 2 valuation. For the six months ended June 30,2014, two available for sale securities were transferred from Level 2 due to lack of observable inputs to substantiate a Level 2 valuation.

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Investments in Entities that Calculate Net Asset Value Per Share

FASB guidance (ASC 825-10-50-6A) requires disclosures about the fair value measurements of investments in certain entities that calculate net asset value per share or its equivalents. These disclosures include the fair value of funds; significant investment strategies of the investees; for investments that cannot be redeemed, estimates of the time periods over which underlying assets are expected to be liquidated; the amounts of the Company's unfunded commitments; redemption features of the investments; restrictions on the ability to sell the investments; and information about sales in certain circumstances.

The Company has investments in venture capital funds that calculate net asset value per share. The Company's investments in venture capital funds generally cannot be redeemed. Alternatively, the Company expects distributions, if any, to be received primarily through M&A activity and IPOs of the underlying assets of the fund. The Company currently does not have any plans to sell any of these fund investments. If the Company decides to sell these investments in the future, generally the investee fund’s management must approve of the buyer before the sale of the investments can be completed. The fair values of the fund investments have been estimated using the net asset value per share of the investments, adjusted for any differences between the Company's measurement date and the date of the fund investment’s net asset value based on the most recently available financial information from the investee general partner. The most recently available financial information is generally as of the end of the previous quarter. For example, the June 30, 2015 financial statements reflect the March 31, 2015 financial information from the investee general partner, adjusted for any contributions paid, distributions received from the investment, and significant fund transactions or market events during the reporting period.

The following tables summarize the estimated fair values and remaining unfunded commitments for these investments:

(in thousands)	June 30, 2015
	Carrying Value		Fair Value		Unfunded Commitments
Venture capital fund investments	$	4,232	$	4,232	$	1,634
Total	$	4,232	$	4,232	$	1,634

(in thousands)	December 31, 2014
	Carrying Value		Fair Value		Unfunded Commitments
Venture capital fund investments	$	3,704	$	3,704	$	2,076
Total	$	3,704	$	3,704	$	2,076

Venture capital fund investments include investments made by Square 1 Financial, Inc. and Square 1 Bank. These investments represent commitments to venture capital funds that invest in or lend money to primarily U.S. and global technology and life sciences companies and invest in U.S. based venture capital funds themselves. It is estimated that the Company will receive distributions from the fund investments over the next 10 to 13 years, depending on the age of the funds and any potential extensions of terms of the funds.

At June 30, 2015, the $4.2 million venture capital fund investments valuation consisted of $1.6 million of Bank investments primarily for CRA purposes, $1.6 million from Square 1 Ventures, and $1.0 million of holding company investments.

Fair Value of Assets Measured on a Non-recurring Basis

Foreclosed Assets — Upon acquisition, foreclosed assets are initially recorded at the fair value of the asset less cost to sell. Any excess of the recorded investment over the fair value of the property received is charged to the allowance for loan losses. Subsequently, foreclosed assets are carried at the lower of carrying value or net realizable value. Reviews will be performed by management and any subsequent write-downs due to the excess of carrying value of a property over its estimated fair value (less estimated costs to sell) are charged against other expenses. Foreclosed assets are included in other assets in the accompanying consolidated balance sheets.

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The following table presents information about the Company's assets measured at fair value on a non-recurring basis:

(in thousands)	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
June 30, 2015
Impaired loans	$	—	$	—	$	9,754	$	9,754
December 31, 2014
Impaired loans	$	—	$	—	$	9,135	$	9,135

Financial Instruments Not Carried at Fair Value

FASB issued guidance over financial instruments (ASC 825-10-65) requires that the Company disclose estimated fair values for the Company's financial instruments not carried at fair value. Fair value estimates, methods and assumptions, set forth below for the Company's financial instruments, are made solely to comply with the requirements of ASC 825.

Fair values are based on estimates or calculations at the transaction level using present value techniques in instances where quoted market prices are not available. Because broadly traded markets do not exist for many of the Company's financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. Fair valuations are management’s estimates of the values, and they are calculated based on indicator prices corroborated by observable market quotes or pricing models, the economic and competitive environment, the characteristics of the financial instruments, expected losses, and other such factors.

These calculations are subjective in nature, involve uncertainties and matters of significant judgment, and do not include tax ramifications; therefore, the results cannot be determined with precision or substantiated by comparison to independent markets, and they may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein does not represent, and should not be construed to represent, the underlying value of the Company.

The following describes the methods and assumptions used in estimating the fair values of financial instruments, excluding financial instruments already recorded at fair value as described above.

Cash and due from banks, federal funds sold and short-term investments

The carrying amounts for cash and due from banks, federal funds sold and short-term investments approximate fair value because of the short maturities of those instruments.

Loans

The fair value of the net loan portfolio has been estimated based on management’s assumptions with respect to present value of expected cash flows, discounted at an interest rate giving consideration to estimated prepayment risk and credit loss factors. There is no material difference between carrying value and fair value of loans as outstanding loans are predominately at variable rates.

Investment securities—held to maturity

The fair value of investment securities held to maturity are based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly.

FHLB stock

The carrying amount of FHLB stock approximates fair value as it is not practicable to determine the fair value due to restrictions placed on its transferability.

Accrued Interest Receivable

The carrying amount of accrued interest receivable approximates fair value due to the short-term nature of the balance.

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Deposits

The fair values of deposits with no stated maturities are predominately at variable rates and, accordingly, the fair values have been estimated to equal the carrying amounts (the amount payable on demand). The fair values of certificates of deposits are estimated by discounting the future cash flows using the current rates offered for similar deposits with the same remaining maturities.

Short-term borrowings

The Company’s short-term borrowings include securities sold under repurchase agreements, federal funds purchased and short-term lines of credit. The carrying amount is a reasonable estimate of fair value because of the relatively short time between the origination of the borrowing and its contractual maturity.

Long-term debt

The Company’s long-term debt includes the Company’s convertible subordinated debentures. Fair value of long-term debt is estimated by discounting the future cash flows using current rates offered with the same maturities, price indications from reputable dealers or utilizing observable market prices of the underlying instrument, whichever is deemed more reliable.

Financial instruments with off-balance sheet risk

With regard to financial instruments with off-balance sheet risk discussed in Note 16, carrying amounts are reasonable estimates of the fair values for such financial instruments. Commitments to extend credit generally result in loans with a market interest rate if funded.

The following tables present the estimated fair values of the Company's financial instruments that are not carried at fair value:

(in thousands)	June 30, 2015
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Estimated Fair Value Ending Balance
Financial assets:
Cash and cash equivalents	$	387,347	$	387,347	$	—	$	—	$	387,347
Investment in time deposits	1,002		1,002		—		—		1,002
Investment securities—held to maturity	392,872		—		386,395		6,420		392,815
Loans, net of unearned income	1,516,032		—		—		1,512,363		1,512,363
FHLB stock	2,787		—		—		2,787		2,787
Accrued interest receivable	13,110		—		13,110		—		13,110
Financial liabilities:
Non-maturity deposits(1)	3,554,380		3,554,380		—		—		3,554,380
Time deposits	9,384		—		9,369		—		9,369
Off-balance sheet financial assets:
Future financing commitments	—		—		—		1,431,391		1,431,391

(1)Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

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(in thousands)	December 31, 2014
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Estimated Fair Value Ending Balance
Financial assets:
Cash and cash equivalents	$	85,942	$	85,942	$	—	$	—	$	85,942
Investment in time deposits	1,251		1,251		—		—		1,251
Investment securities—held to maturity	300,425		—		299,986		6,420		306,406
Loans, net of unearned income	1,346,449		—		—		1,336,470		1,336,470
FHLB stock	2,091		—		—		2,091		2,091
Accrued interest receivable	11,878		—		11,878		—		11,878
Financial liabilities:
Non-maturity deposits(1)	2,760,232		2,760,232		—		—		2,760,232
Time deposits	16,320		—		16,268		—		16,268
Off-balance sheet financial assets:
Future financing commitments	—		—		—		1,232,078		1,232,078

(1)Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

16. OFF-BALANCE SHEET RISK, COMMITMENTS AND CONTINGENCIES

To meet the financial needs of its customers, the Company is party to financial instruments with off-balance sheet risk in the normal course of business. These financial instruments are comprised of unfunded lines of credit and financial standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amounts recognized in the accompanying consolidated balance sheet.

The Company’s exposure to credit loss in the event of nonperformance by the other party is represented by the contractual amount of these instruments. The Company uses the same credit policies in making these commitments as it does for on-balance sheet instruments. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies but may include cash in deposit accounts, trade accounts receivable, property, plant, and equipment and intellectual property. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.

At June 30, 2015 and December 31, 2014, unfunded lines of credit were $1.4 billion and $1.2 billion, respectively, and outstanding standby letters of credit amounted to $78.5 million and $68.4 million, respectively.

Three putative stockholder class action lawsuits were filed in connection with the previously disclosed proposed merger between us and PacWest (see Note 1). Manganaro v. Burke et al., Case No. 10817-VCL,  was filed in the Court of Chancery of the State of Delaware on March 20, 2015, and was voluntarily dismissed without prejudice on May 5, 2015. Lakowitz v. Bowers et al., Case No. 1:15-CV-371, was filed in the federal district court for the Middle District of North Carolina on May 6, 2015 and was voluntarily dismissed without prejudice on May 7, 2015. 

Li v. Bowers et al., Case No. 1:15-CV-373 (the “Li Action”), was filed in federal district court for the Middle District of North Carolina on May 7, 2015. The Li Action alleged that the members of the Square 1 board of directors breached their fiduciary duties to Square 1 stockholders and failed to take steps to maximize the value to be paid to the Square 1 stockholders. In addition, the Li Action alleged that PacWest aided and abetted these alleged breaches of fiduciary duties. The Li Action also alleged violations of federal securities laws with respect to allegedly misleading statements contained in the registration statement filed with the SEC in connection with the merger. The plaintiffs in the Li Action sought, among other things, declaratory and injunctive relief, attorneys’ fees and costs, and other and further relief. 

On June 1, 2015, the parties to the Li Action entered into a Memorandum of Understanding which sets forth the parties’ agreement in principle to a settlement of that action. In connection with the settlement of the Li Action, Square 1 and PacWest agreed to make certain additional disclosures, which were contained in the definitive proxy statement and prospectus filed with the SEC with respect to the merger. The settlement remains subject to a number of conditions,

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including, among other things, final documentation and court approval following notice to the settlement class. There can be no assurance that the settlement will ultimately be approved by the court.

 From time to time, the Company is party, either as a defendant or plaintiff, to other lawsuits in the normal course of its business. While any litigation involves an element of uncertainty, management is of the opinion that the liability, if any, resulting from these other pending legal proceedings in the normal course of business will not have a material adverse effect on our financial condition, liquidity or results of operations.

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

This document contains forward-looking statements within the meaning of section 27A of the Securities Act and 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). These forward-looking statements reflect our current views with respect to, among other things, future events and our financial performance. These statements are often, but not always, made through the use of words or phrases such as “may,” “should,” “could,” “predict,” “potential,” “believe,” “will likely result,” “expect,” “continue,” “will,” “anticipate,” “seek,” “estimate,” “intend,” “plan,” “projection,” “would” and “outlook,” or the negative version of those words or other comparable of a future or forward-looking nature. These forward-looking statements are not historical facts, and are based on current expectations, estimates and projections about our industry, management’s beliefs and certain assumptions made by management, many of which, by their nature, are inherently uncertain and beyond our control. Accordingly, we caution you that any such forward-looking statements are not guarantees of future performance and are subject to risks, assumptions and uncertainties that are difficult to predict. Although we believe that the expectations reflected in these forward-looking statements are reasonable as of the date made, actual results may prove to be materially different from the results expressed or implied by the forward-looking statements.

There are or will be important factors that could cause our actual results to differ materially from those indicated in these forward-looking statements, including, but are not limited to, the following:

• market and economic conditions (including interest rate environment, levels of public offerings, mergers and acquisitions (“M&A”) and venture capital financing activities) and the associated impact on us;

• our ability to obtain regulatory approvals and meet other closing conditions to the planned merger of the Company with and into PacWest Bancorp (“PacWest”), with PacWest surviving the merger (the “Merger”), including approval by the Company’s shareholders;

• delay in closing the Merger;

• difficulties and delays in integrating the Company’s businesses with those of PacWest or fully realizing cost savings and other benefits of the Merger;

• changes in management personnel;

• the sufficiency of our capital, including sources of capital (such as funds generated through retained earnings) and the extent to which capital may be used or required;

• our overall investment plans, strategies and activities, including our investment of excess cash/liquidity;

• venture capital/private equity funding and investments;

• operational, liquidity and credit risks associated with our business;

• deterioration of our asset quality;

• our overall management of interest rate risk, including managing the sensitivity of our interest-earning assets and interest-bearing liabilities to interest rates, and the impact to earnings from a change in interest rates;

• our ability to execute our strategy and to achieve organic loan and deposit growth;

• increased competition in the financial services industry, nationally, regionally or locally, which may adversely affect pricing and terms;

• the adequacy of reserves (including allowance for loan and lease losses) and the appropriateness of our methodology for calculating such reserves;

• the level of client investment fees and associated margins;

• changes in federal tax law or policy;

• volatility and direction of market interest rates;

• changes in the regulatory environment;

• changes in trade, monetary and fiscal policies and laws;

• governmental legislation and regulation, including changes in accounting regulation or standards, the nature and timing of the adoption and effectiveness of new requirements under the Dodd-Frank Act, Basel guidelines, capital requirements and other applicable laws and regulations;

• changes in interpretation of existing law and regulation;

• further government intervention in the U.S. financial system; and

• other factors that are discussed in the section titled “Risk Factors,” which are set forth in the Company's 2014 Form 10-K, as filed with the SEC on March 20, 2015.

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The foregoing factors should not be construed as exhaustive and should be read together with the other cautionary statements included in this filing. If one or more events related to these or other risks or uncertainties materialize, or if our underlying assumptions prove to be incorrect, actual results may differ materially from what we anticipate. Accordingly, you should not place undue reliance on any such forward-looking statements. Any forward-looking statement speaks only as of the date on which it is made, and we do not undertake any obligation to publicly update or review any forward-looking statement, whether as a result of new information, future developments or otherwise. New factors emerge from time to time, and it is not possible for us to predict which will arise. In addition, we cannot assess the impact of each factor on our business or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements.

The objective of this section is to help potential investors understand our views on our results of operations and financial condition. You should read this discussion in conjunction with the unaudited interim consolidated financial statements and notes thereto in this Form 10-Q and in conjunction with Square 1's consolidated balance sheets as of December 31, 2014 and 2013, and the related consolidated statements of income and comprehensive income, changes in shareholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2014, and notes thereto included in the 2014 Form 10-K.

Management’s Discussion and Analysis includes financial information prepared in accordance with GAAP, as well as certain non-GAAP financial measures such as “efficiency ratio,” “tangible common equity to tangible assets,” “net operating income,” "net interest income," and "core banking noninterest income" (see "Non-GAAP Financial Measures").

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Summary Financial Information

The following summary financial information is derived in part from our consolidated financial statements. The following is only a summary and you should read it in conjunction with the unaudited interim consolidated financial statements and the related notes.

(Dollars in thousands)	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Financial Condition Data:
Average total assets	$	3,503,389	$	2,644,511	$	3,347,745	$	2,510,087
Average cash and cash equivalents	211,733		223,988		148,754		171,998
Average investment securities - available-for-sale	1,337,891		1,054,438		1,323,749		1,011,040
Average investment securities - held-to-maturity	373,227		194,781		366,322		179,895
Average loans, net of unearned income	1,513,504		1,119,867		1,441,864		1,094,482
Average on-balance sheet deposits	3,165,466		2,359,042		2,990,659		2,255,351
Average total client investment funds	1,592,218		749,976		1,516,454		690,340
Average borrowings	440		2,236		24,641		5,189
Average repurchase agreements	—		—		—		3,029
Average total shareholders' equity	325,094		275,014		317,643		236,804
Operating Data:
Interest income	$	31,593	$	25,075	$	60,994	$	47,875
Interest expense	194		199		450		492
Net interest income	31,399		24,876		60,544		47,383
Provision for loan losses	3,758		3,150		9,205		6,114
Net interest income after provision for loan losses	27,641		21,726		51,339		41,269
Noninterest income	7,632		6,372		13,844		13,511
Noninterest expense	20,307		16,600		38,644		32,183
Income before income tax expense	14,966		11,498		26,539		22,597
Income tax expense	5,047		3,447		8,467		6,698
Preferred stock dividends and discount accretion	—		1		—		63
Net income available to common shareholders	9,919		8,050		18,072		15,836

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	At or For the
	Three Months Ended June 30,				Six Months Ended June 30,
	2015		2014		2015		2014
Performance Ratios:	(Dollars in thousands)
Return on average assets	1.14	%	1.22	%	1.09	%	1.27	%
Return on average common equity	12.24		11.74		11.47		13.63
Net interest margin(1)	3.83		4.03		3.89		4.07
Efficiency ratio(2)	49.33		51.29		49.13		50.96
Average equity to average assets	9.28		10.40		9.49		9.43
Capital Ratios (consolidated):
Tier 1 leverage capital	9.07		10.42		9.07		10.42
Common equity Tier 1 capital	12.09		14.70		12.09		14.70
Tier 1 risk-based capital	12.09		14.70		12.09		14.70
Total risk-based capital	13.12		15.88		13.12		15.88
Total shareholders’ equity to assets	8.35		10.35		8.35		10.35
Tangible common equity to tangible assets(3)	8.34		10.33		8.34		10.33
Asset Quality Ratios:
Allowance for loan losses as a percent of total loans	1.65		1.87		1.65		1.87
Allowance for loan losses as a percent of nonperforming loans	139.58		175.54		139.58		175.54
Net charge-offs to average outstanding loans (annualized)	0.92		0.25		0.99		0.54
Nonperforming loans as a percent of total loans	1.18		1.07		1.18		1.07
Nonperforming assets as a percent of total assets	0.46		0.45		0.46		0.45

(1) Represents net interest income as a percent of average interest-earning assets.

(2) Represents noninterest expense, excluding merger-related expenses divided by the sum of net interest income and other income, excluding gains or losses on the impairment and sale of securities. Efficiency ratio, as calculated, is a non-GAAP financial measure. See “Non-GAAP Financial Measures.”

(3) Tangible common equity to tangible assets is a non-GAAP financial measure. Tangible common equity is computed as total shareholders’ equity less intangible assets. Tangible assets are calculated as total assets less intangible assets other than loan servicing intangible assets. We believe that the most directly comparable GAAP financial measure is total shareholders’ equity to assets. See “Non-GAAP Financial Measures.”

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Non-GAAP Financial Measures

The information set forth above contains certain financial information determined by methods other than in accordance with GAAP. Generally, a non-GAAP financial measure is a numerical measure of financial performance, financial position or cash flows that excludes (or includes) amounts that are included in (or excluded from) the most directly comparable measure calculated and presented in accordance with GAAP. These non-GAAP financial measures for us are “efficiency ratio,” “tangible common equity to tangible assets,” “net operating income,” "net interest income," "core banking noninterest income," and "earnings per diluted share excluding merger-related expenses." Although we believe these non-GAAP financial measures provide a greater understanding of our business, these measures are not necessarily comparable to similar measures that may be presented by other companies. The non-GAAP financial measures should be viewed as a supplement to, and not a substitute for, financial measures presented in accordance with GAAP.

Efficiency ratio represents noninterest expense, excluding merger-related expenses divided by the sum of net interest income and other income, excluding gains or losses on the impairment and sale of securities. This measure is used by management to evaluate our operational efficiency.

Tangible common equity to tangible assets ratio is used by management to evaluate the adequacy of our capital levels. Tangible common equity is computed as total shareholders’ equity less intangible assets. Tangible assets are calculated as total assets less intangible assets other than loan servicing intangible assets. We believe that the most directly comparable GAAP financial measure is total shareholders’ equity to assets.

Tangible common equity is computed as total shareholders’ equity less intangible assets. Tangible book value per common share is calculated as tangible common equity divided by common shares outstanding. We believe that the most directly comparable GAAP financial measure is book value per common share.

Non-GAAP net operating income represents net operating income before income tax expense on a fully tax equivalent basis excluding the impact of gains and losses on the sale of securities and impairments. We believe that the most directly comparable GAAP financial measure is income before income tax expense.

Our discussions of net interest income and the net interest margin are presented on a fully taxable equivalent basis based on the federal statutory rate of 35% to consistently reflect income from taxable loans and securities and tax-exempt securities. We believe that the most directly comparable GAAP financial measure is net interest income.

Core banking noninterest income represents recurring income from traditional banking services provided to our customers and excludes line items where results are typically subject to market or other conditions beyond our control. We believe that the most directly comparable GAAP financial measure is noninterest income.

Non-GAAP earnings per diluted share excluding merger-related expenses represents earnings per diluted share on a GAAP basis excluding the impact of recorded charges for merger expenses related to the PacWest Bancorp and Square 1 merger. Merger expenses include merger transaction and integration costs. Management does not consider these expenses to be representative of our fundamental earnings as we would not otherwise incur these expenses as part of our operations in the periods presented. We believe that the most directly comparable GAAP financial measure is earnings per share - diluted.

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The information provided below reconciles each non-GAAP measure to its most comparable GAAP measure:

	At or For the
(Dollars in thousands)	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Efficiency Ratio
Noninterest expense (GAAP)	$	20,307		$	16,600		$	38,644		$	32,183
Less: merger-related expenses	792			—			1,004			—
Adjusted noninterest expense	$	19,515		$	16,600		$	37,640		$	32,183
Net interest taxable equivalent income	32,725			25,863			63,124			49,321
Noninterest taxable equivalent income	7,861			6,543			14,307			13,840
Less: gain on sale of securities and impairment	1,025			38			821			4
Adjusted operating revenue	$	39,561		$	32,368		$	76,610		$	63,157
Efficiency ratio	49.33		%	51.29		%	49.13		%	50.96		%
Tangible Common Equity/Tangible Assets
Total equity	$	326,646		$	283,696		$	326,646		$	283,696
Less: Intangible assets(1)	295			597			295			597
Tangible common equity	$	326,351		$	283,099		$	326,351		$	283,099
Total assets	$	3,912,503		$	2,741,524		$	3,912,503		$	2,741,524
Less: intangible assets(1)	295			597			295			597
Tangible assets	$	3,912,208		$	2,740,927		$	3,912,208		$	2,740,927
Tangible common equity/tangible assets	8.34		%	10.33		%	8.34		%	10.33		%
Net Operating Income
GAAP income before taxes	$	14,966		$	11,498		$	26,539		$	22,597
Add: gain on sale of securities and impairment	1,025			38			821			4
Add: tax equivalent adjustment	1,555			1,157			3,043			2,266
Non-GAAP net operating income before taxes	$	15,496		$	12,617		$	28,761		$	24,859
Net Interest Income
GAAP net interest income	$	31,399		$	24,876		$	60,544		$	47,383
Add: tax equivalent adjustment	1,326			987			2,580			1,938
Non-GAAP net interest income (fully tax equivalent basis)	$	32,725		$	25,863		$	63,124		$	49,321
Core Banking Noninterest Income
GAAP noninterest income	$	7,632		$	6,372		$	13,844		$	13,511
Less: net gain on securities and impairment	1,025			38			821			4
Warrant income	239			21			$	701		$	2,216
Gain on sale of loans	592			249			1,398			502
Bank owned life insurance	424			317			859			607
Other	565			2,035			826			2,432
Non-GAAP core banking noninterest income	$	4,787		$	3,712		$	9,239		$	7,750
Earnings Per Diluted Share Excluding Merger-related Expenses
GAAP earnings per share - diluted	$	0.33		$	0.27		$	0.60		$	0.58
Add: merger related expenses	0.02			—			0.02			—
Non-GAAP earnings per diluted share excluding merger costs	$	0.35		$	0.27		$	0.62		$	0.58

(1) Does not include a loan servicing asset of $1.4 million and $1.3 million at June 30, 2015 and June 30,2014, respectively.

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Executive Overview of Recent Financial Performance

Our strategy is to grow organically in the key U.S. innovation markets. As part of this growth strategy, we expect to continue to evolve our mix of loan business to include more expansion and later stage companies and more business with venture capital firms. We believe this loan mix tilt will help us continue to lower credit costs. Certain elements of our business, such as warrant gains, deposit inflows and to some extent credit quality, can create a degree of quarterly variability to our numbers.

Continued strong balance sheet and revenue growth during the three and six months ended June 30,2015 resulted in increased net operating income. Consolidated net income available to common shareholders was $9.9 million and diluted earnings per share was $0.33 for the three months ended June 30,2015, compared to net income available to common shareholders of $8.1 million and diluted earnings per share of $0.27 for the three months ended June 30,2014. Earnings per share excluding the impact of merger-related expenses was $0.35 per diluted share for the three months ended June 30,2015 compared to $0.27 for the three months ended June 30,2014. Consolidated net income available to common shareholders was $18.1 million and diluted earnings per share was $0.60 for the six months ended June 30,2015, compared to net income available to common shareholders of $15.8 million and diluted earnings per share of $0.58 for the six months ended June 30,2014. Earnings per share excluding the impact of merger-related expenses was $0.62 per diluted share for the three months ended June 30,2015 compared to $0.58 for the three months ended June 30,2014. Return on average common equity was 12.24% and return on average assets was 1.14% for the three months ended June 30,2015. Return on average common equity was 11.47% and return on average assets was 1.09% for the six months ended June 30,2015.

During the three and six months ended June 30,2015, net interest income increased $6.5 million, or 26.2%, and $13.2 million, or 27.8%, respectively, as a result of solid growth in both our loan and investment portfolios driven by significant growth in deposits. Average loan balances for the three and six months ended June 30,2015, grew 35.2% and 31.7%, respectively, compared to the three and six months ended June 30,2014. Period-end loans increased 12.6% from December 31, 2014. The loan growth is the result of further deepening of our coverage in key markets and expansion into new markets, more loans to later stage clients, and an increase in our overall brand awareness. Increases in the average balances of our investment portfolio of 37.0% and 41.9%, respectively, for the three and six months ended June 30,2015 compared to the three and six months ended June 30,2014, also drove the increase in net interest income. Period-end investment securities increased 21.3% from December 31, 2014.

We also continue to experience favorable funding of our interest earning assets with 67.1% and 66.7%, respectively, of our average deposits for the three and six months ended June 30,2015 coming from noninterest-bearing deposits, compared to 64.4% and 64.5%, respectively, for the three and six months ended June 30,2014. Net interest margin decreased to 3.83% and 3.89%, respectively, for the three and six months ended June 30,2015 compared to 4.03% and 4.07%, respectively, for the same periods in the prior year.

Loan growth was funded by our continued success in growing our low cost deposits from new and existing venture firms and entrepreneurial companies. Our average client funds, which consist of on-balance sheet deposits and client investment funds, increased 53.0% for both the three and six months ended June 30,2015, compared to the three and six months ended June 30,2014. Our ability to move deposits off balance sheet is key to managing our balance sheet growth and capital ratios. Our period end client investment funds grew 19.2% from December 31, 2014, reflecting our continuing ability to manage deposits off balance sheet in a manner that benefits both our clients and us.

Credit quality exceeded historical experience during 2014 while credit quality during the three and six months ended June 30,2015 was more reflective of historical experience. At June 30, 2015, our ratio of nonperforming loans to total loans decreased from December 31, 2014, but increased from June 30,2014. Net loan charge-offs were 0.92% and 0.99%, respectively, of average loans (annualized) for the three and six months ended June 30,2015, compared to 0.25% and 0.54%, respectively, for the three and six months ended June 30,2014. The impact of loan growth and higher net charge offs drove increases of $0.6 million and $3.1 million, respectively, in our provision for loan losses for the three and six months ended June 30,2015, compared to the three and six months ended June 30,2014.

Core banking noninterest income, which represents income from traditional banking services provided to our customers, increased $1.1 million and $1.5 million, respectively, for the three and six months ended June 30,2015 compared to the three months ended June 30,2014, as we continued to focus on enhancing our product offerings and adding new customers. Total noninterest income increased $1.3 million compared to the three months ended June 30,2014, as increases of $1.1 million in core banking noninterest income and $1.0 million in the net gain on securities were partially offset by a $1.1 million decrease in unrealized gains from our venture capital fund investments. Total noninterest income increased $0.3 million compared to the six months ended June 30,2014, as increases of $1.5 million in core banking noninterest income, $0.8 million in the net gain

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on securities and $0.9 million in the gain on sale of loans were largely offset by decreases of $1.1 million in the unrealized gains from our venture capital fund investments and $1.5 million in warrant income.

Noninterest expense increased $3.7 million compared to the three months ended June 30,2014 primarily due to $1.8 million higher personnel expenses, $0.3 million higher professional fees and merger-related expenses of $0.8 million. Noninterest expense increased $6.5 million compared to the six months ended June 30,2014 primarily due to increases in personnel expenses, professional fees and the provision for unfunded credit commitments of $3.4 million, $0.5 million and $0.5 million, respectively, and merger-related expenses of $1.0 million. The increase in personnel expense primarily resulted from an increase in our full-time equivalent employees to 280 at June 30,2015, from 245 at June 30,2014, and higher incentive compensation expense. Throughout 2015, we anticipate hiring a similar number of full-time equivalent employees as were hired during the year ended December 31, 2014 mixed between bankers and support staff. Overall, we anticipate an increase in our expenses in the mid-teens in 2015 as we continue to hire additional employees and invest in our franchise to support growth.

Proposed Merger with PacWest Bancorp

On March 1, 2015, we entered into an Agreement and Plan of Merger (the "Merger Agreement") with PacWest Bancorp, a Delaware corporation ("PacWest"), pursuant to which we will merge with and into PacWest, with PacWest as the surviving corporation (the "Merger"). The Merger Agreement also provides that immediately following the Merger, Square 1 Bank, our wholly-owned subsidiary, will merge with and into Pacific Western Bank, a California state-chartered bank and wholly-owned subsidiary of PacWest, with Pacific Western Bank as the surviving bank. Under the terms and subject to the conditions of the Merger Agreement, each issued and outstanding share of common stock of Square 1 will be converted into the right to receive 0.5997 of a share of PacWest common stock. The transaction is currently valued at approximately $867 million. Completion of the Merger is subject to certain customary conditions, including approval by our stockholders and the receipt of certain required regulatory approvals. The Merger was approved by our stockholders on July 29, 2015.

Additional information regarding the Merger is included in our Current Report on Form 8-K filed with the SEC on March 5, 2015 and in the registration statement filed by PacWest with the SEC which includes a proxy statement of Square 1 and a prospectus of PacWest.

Critical Accounting Policies and Estimates

Our management's discussion and analysis of financial condition and results of operations is based on our unaudited interim consolidated financial statements, which were prepared in accordance with GAAP. In preparing our unaudited interim consolidated financial statements, we made certain estimates that were critical in nature to our financial condition and results of operations as they require us to make especially difficult, subjective and/or complex judgments about matters that are inherently uncertain and because it is likely that materially different amounts would be reported using different conditions and assumptions. We have discussed the development and selection of these critical accounting policies and estimates with the Audit Committee of our Board of Directors.

There have been no material changes to critical accounting policies and estimates discussed under "Management’s Discussion and Analysis of Financial Condition and Results of Operations - Critical Accounting Policies and Estimates" in the 2014 Form 10-K.

Impact of Recent Accounting Pronouncements

The information required by this item is included in Note 2 to the consolidated financial statements included in this Form 10-Q.

RESULTS OF OPERATIONS

Performance Summary

Three Months Ended June 30,2015 and 2014. For the three months ended June 30,2015, we reported net income available to common shareholders of $9.9 million, an increase of $1.9 million, or 23.2%, compared to net income available to common shareholders of $8.1 million for the three months ended June 30,2014. The increase resulted from a $6.5 million, or

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26.2%, increase in net interest income and a $1.3 million, or 19.8%, increase in noninterest income, partially offset by a $0.6 million, or 19.3%, increase in the provision for loan losses, a $3.7 million, or 22.3%, increase in noninterest expense and a $1.6 million, or 46.4%, increase in income tax expense.

The increase in net interest income compared to the three months ended June 30,2014 was primarily driven by the higher average balances of our loan and investment securities portfolios, partially offset by lower yields. The increase in noninterest income was primarily due to a $1.1 million increase in core banking noninterest income and a $1.0 million increase in the net gain on securities, partially offset by a $1.1 million decrease in unrealized gains from our venture capital fund investments. The increase in noninterest expense compared to the three months ended June 30,2014 was primarily due to $1.8 million higher personnel expenses along with merger-related expenses and higher professional fee expense in the three months ended June 30,2015. Higher personnel expenses were driven by an increase of 35 full-time equivalent employees and higher incentive compensation expense. The increase in income tax expense was driven by higher pre-tax net income and a higher effective tax rate.

Six Months Ended June 30,2015 and 2014. For the six months ended June 30,2015, we reported net income available to common shareholders of $18.1 million, an increase of $2.2 million, or 14.1%, compared to net income available to common shareholders of $15.8 million for the six months ended June 30,2014. The increase resulted from a $13.2 million, or 27.8%, increase in net interest income, partially offset by a $3.1 million, or 50.6%, increase in the provision for loan losses, a $6.5 million, or 20.1%, increase in noninterest expense, and a $1.8 million, or 26.4%, increase in income tax expense.

The increase in net interest income compared to the six months ended June 30,2014 was primarily the result of our continued success in attracting low cost deposits and growing our loan portfolio, along with higher balances on our investment portfolio, partially offset by lower yields on our loan and investment portfolios. Noninterest income was relatively flat increasing 2.5% as increases of $1.5 million in core banking noninterest income, $0.8 million in the net gain on securities and $0.9 million in the gain on sale of loans were mostly offset by decreases of $1.1 million in the unrealized gains from our venture capital fund investments and $1.5 million in warrant income. The increase in noninterest expense compared to the six months ended June 30,2014 was primarily due to $3.4 million higher personnel expenses in the six months ended June 30,2015 driven by the increase in full-time equivalent employees and higher incentive compensation expense. Merger-related expenses and increases in the provision for unfunded credit commitments and professional fee expense also contributed to higher total noninterest expense. The higher income tax expense was driven by the growth in pre-tax net income and a higher effective tax rate.

Net Interest Income and Net Interest Margin (Fully Tax Equivalent Basis)

The information set forth below contains certain financial information determined by methods other than in accordance with GAAP. See "Non-GAAP Financial Measures" section for a reconciliation of this non-GAAP measure to its most comparable GAAP measure.

Net interest income, the primary contributor to our earnings, represents the difference between the income that we earn on our interest-earning assets and the cost to us of our interest-bearing liabilities. Our net interest income depends upon the volume of interest-earning assets and interest-bearing liabilities and the interest rates that we earn or pay on them. Net interest income is affected by changes in the amount and mix of interest-earning assets and interest-bearing liabilities, referred to as “volume changes.” It is also affected by changes in yields earned on interest-earning assets and rates paid on interest-bearing deposits and other borrowed funds, referred to as “rate changes.” The yield earned on loans includes loan fees, which are primarily loan origination fees and loan documentation fees related to loan origination. While a loan is classified as nonaccrual and the future collectability of the recorded loan balance is doubtful, collections of interest and principal are generally applied as a reduction to the principal outstanding and no interest income is recognized. Net interest income and the net interest margin are presented on a fully taxable equivalent basis based on the federal statutory rate of 35% to consistently reflect income from taxable loans and securities and tax-exempt securities.

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Net Interest Income (Fully Tax Equivalent Basis)

Three Months Ended June 30,2015 and 2014. For the three months ended June 30,2015, net interest income increased $6.9 million, or 26.5%, to $32.7 million compared to the three months ended June 30,2014. This increase was primarily driven by a $6.9 million, or 26.3%, increase in interest income. Our interest income increase primarily resulted from:

• a $4.5 million, or 25.3%, increase to $22.2 million in interest income on loans, resulting from a 35.2% higher average balance, partially offset by a 46 basis point decline in the yield earned. The 46 basis point decline in the yield earned resulted from increased competitive pressure in the current low rate environment;

• a $1.4 million, or 26.3%, increase to $6.8 million in interest income on taxable securities due to a 38.5% higher average balance, partially offset by a 18 basis point decrease in the yield earned. The higher taxable securities balance was driven by investments purchased as a result of deposit growth, and the lower yield was primarily a result of purchases of lower yielding securities; and

• a $1.0 million, or 34.2%, increase to $3.8 million in interest income on nontaxable securities caused by a 30.3% higher average balance and a 14 basis point increase in the yield earned on nontaxable securities. The higher nontaxable securities balance and yield was primarily a result of our continued purchases of higher yielding municipal securities.

Interest expense of $0.2 million was flat compared to the three months ended June 30,2014, and as the impact of the conversion to common stock of the trust preferred securities in the first half of 2014 was offset by the higher average balance and higher yields paid on money market accounts.

Six Months Ended June 30,2015 and 2014. For the six months ended June 30,2015, net interest income increased $13.8 million, or 28.0%, to $63.1 million compared to the six months ended June 30,2014. This increase was primarily driven by a $13.8 million, or 27.6%, increase in interest income. Our interest income increase primarily resulted from:

• a $8.2 million, or 24.1%, increase to $42.3 million in interest income on loans, resulting from a 31.7% higher average balance, partially offset by a 37 basis point decline in the yield earned. The 37 basis point decline in the yield earned resulted from increased competitive pressure in the current low rate environment;

• a $3.8 million, or 37.7%, increase to $13.7 million in interest income on taxable securities due to a 45.2% higher average balance, partially offset by a 11 basis point decrease in the yield earned. The higher taxable securities balance was driven by investments purchased as a result of deposit growth, and the lower yield was primarily a result of purchases of lower yielding securities; and

• a $1.8 million, or 32.9%, increase to $7.4 million in interest income on nontaxable securities caused by a 28.1% higher average balance and a 18 basis point increase in the yield earned on nontaxable securities. The higher nontaxable securities balance and yield was primarily a result of our continued purchases of higher yielding municipal securities.

Interest expense of $0.5 million represented an 8.5% decrease from the six months ended June 30,2014, and was primarily driven by the conversion to common stock of the trust preferred securities in the first half of 2014, partially offset by higher average deposit balances and higher yields paid on money market accounts.

Net Interest Margin (Fully Tax Equivalent Basis)

Three and Six Months Ended June 30,2015 and 2014. Our net interest margin decreased to 3.83% and 3.89%, respectively, for the three and six months ended June 30,2015 compared to 4.03% and 4.07%, respectively, compared to the three and six months ended June 30,2014.

The primary reasons for the decrease were:

• lower loan interest yields in the current low rate environment that continues in 2015; and

• an increase in the purchasing of lower yielding securities

These decreases were slightly offset by lower funding costs driven by the redemption of our junior subordinated debt in 2014.

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Average Balances and Yields

The following table presents information regarding average balances for assets and liabilities, the total dollar amounts of interest income and dividends from average interest-earning assets, the total dollar amounts of interest expense on average interest-bearing liabilities, and the resulting average yields and costs. The yields and costs for the periods indicated are derived by dividing the income or expense by the average balances for assets or liabilities, respectively, for the periods presented. Loan fees are included in interest income on loans. Yields are presented on a tax equivalent basis.

	Three Months Ended June 30,
	2015							2014
	Average Balance			Interest and Dividends		Yield/ Cost		Average Balance			Interest and Dividends		Yield/ Cost
	(Dollars in thousands)
Interest-earning assets:
Interest-bearing deposits in other banks	$	204,375		$	127	0.25	%	$	204,385		$	134	0.27	%
Federal funds sold and other short-term investments	1,001			1		0.35		1,648			3		0.75
Loans, net of unearned income	1,513,504			22,207		5.89		1,119,867			17,720		6.35
Nontaxable securities	303,692			3,789		5.00		233,137			2,823		4.86
Taxable securities	1,407,426			6,795		1.94		1,016,082			5,382		2.12
Total interest-earning assets	3,429,998			32,919		3.85		2,575,119			26,062		4.06
Less: Allowance for loan losses	(24,919		)					(20,086		)
Noninterest-earning assets	98,310							89,478
Total assets	$	3,503,389						$	2,644,511
Interest-bearing liabilities:
Demand deposits	$	96,817		18		0.08		$	117,542		21		0.07
Money market	933,385			172		0.07		692,727			106		0.06
Time deposits	11,733			3		0.09		30,133			16		0.22
Total interest-bearing deposits	1,041,935			193		0.07		840,402			143		0.07
FHLB advances	440			1		0.38		—			—		—
Junior subordinated debt	—			—		—		2,236			56		10.09
Total interest-bearing liabilities	1,042,375			194		0.07		842,638			199		0.09
Noninterest-bearing deposits	2,123,531							1,518,640
Other noninterest-bearing liabilities	12,389							8,219
Total liabilities	3,178,295							2,369,497
Total shareholders’ equity	325,094							275,014
Total liabilities and shareholders’ equity	$	3,503,389						$	2,644,511
Net interest income				$	32,725						$	25,863
Interest rate spread						3.78	%						3.97	%
Net interest margin						3.83	%						4.03	%
Ratio of average interest-earning assets to average interest-bearing liabilities						329.06	%						305.60	%

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	Six Months Ended June 30,
	2015							2014
	Average Balance			Interest and Dividends		Yield/ Cost		Average Balance			Interest and Dividends		Yield/ Cost
	(Dollars in thousands)
Interest-earning assets:
Interest-bearing deposits in other banks	$	140,056		$	166	0.24	%	$	155,595		$	196	0.25	%
Federal funds sold and other short-term investments	1,124			2		0.32		1,538			5		0.63
Loans, net of unearned income	1,441,864			42,341		5.92		1,094,482			34,123		6.29
Nontaxable securities	295,499			7,372		5.03		230,629			5,546		4.85
Taxable securities	1,394,572			13,693		1.98		960,306			9,943		2.09
Total interest-earning assets	3,273,115			63,574		3.92		2,442,550			49,813		4.11
Less: Allowance for loan losses	(24,224		)					(19,780		)
Noninterest-earning assets	98,854							87,317
Total assets	$	3,347,745						$	2,510,087
Interest-bearing liabilities:
Demand deposits	$	94,620		45		0.10		$	117,097		44		0.08
Money market	887,462			352		0.08		654,990			199		0.06
Time deposits	14,186			7		0.10		28,138			30		0.22
Total interest-bearing deposits	996,268			404		0.08		800,225			273		0.07
FHLB advances	24,641			46		0.37		995			2		0.41
Repurchase agreements	—			—		—		3,029			1		0.10
Junior subordinated debt	—			—		—		4,194			216		10.36
Other borrowings	166			—		0.30		—			—		—
Total interest-bearing liabilities	1,021,075			450		0.09		808,443			492		0.12
Noninterest-bearing deposits	1,994,391							1,455,126
Other noninterest-bearing liabilities	14,636							9,714
Total liabilities	3,030,102							2,273,283
Total shareholders’ equity	317,643							236,804
Total liabilities and shareholders’ equity	$	3,347,745						$	2,510,087
Net interest income				$	63,124						$	49,321
Interest rate spread						3.83	%						3.99	%
Net interest margin						3.89	%						4.07	%
Ratio of average interest-earning assets to average interest-bearing liabilities						320.56	%						302.13	%

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Rate/Volume Analysis

The following table sets forth the effects of changing rates and volumes on our net interest income. The rate column shows the effects attributable to changes in rate (changes in rate multiplied by current volume). The volume column shows the effects attributable to changes in volume (changes in volume multiplied by prior rate). The net column represents the sum of the prior columns. For purposes of this table, changes attributable to changes in both rate and volume that cannot be segregated have been allocated proportionally based on the changes due to rate and the changes due to volume.

	Three Months Ended June 30, 2015
	Compared to
	Three Months Ended June 30, 2014
	Increase (Decrease) Due to
	Rate			Volume			Net
	(Dollars in thousands)
Interest income:
Interest-bearing deposits in other banks	$	(7	)	$	—		$	(7	)
Federal funds sold and other short-term investments	(2		)	—			(2		)
Loans, net of unearned income	(1,742		)	6,229			4,487
Nontaxable securities(1)	8			958			966
Taxable securities	(775		)	2,188			1,413
Total interest-earning assets	(2,518		)	9,375			6,857
Interest expense:
Demand deposits	1			(4		)	(3		)
Money market	29			37			66
Time deposits	(3		)	(10		)	(13		)
Borrowings	(10		)	(45		)	(55		)
Total interest-bearing liabilities	17			(22		)	(5		)
Change in net interest income	$	(2,535	)	$	9,397		$	6,862

(1) Tax equivalent income.

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	Six Months Ended June 30, 2015
	Compared to
	Six Months Ended June 30, 2014
	Increase (Decrease) Due to
	Rate			Volume			Net
	(Dollars in thousands)
Interest income:
Interest-bearing deposits in other banks	$	(10	)	$	(23	)	$	(33	)
Loans, net of unearned income	(2,612		)	10,830			8,218
Nontaxable securities(1)	25			1,801			1,826
Taxable securities	(1,570		)	5,320			3,750
Total interest-earning assets	(4,167		)	17,928			13,761
Interest expense:
Demand deposits	10			(9		)	1
Money market	82			71			153
Time deposits	(8		)	(15		)	(23		)
Borrowings	(12		)	(161		)	(173		)
Total interest-bearing liabilities	72			(114		)	(42		)
Change in net interest income	$	(4,239	)	$	18,042		$	13,803

(1) Tax equivalent income.

Provision for Loan Losses

We consider a number of factors in determining the required level of our loan reserves and the provision required to achieve what we believe is the appropriate reserve level, including loan growth, credit risk rating trends, nonperforming loan levels, delinquencies, loan portfolio concentrations and economic and market trends. The provision for loan losses represents our determination of the amount necessary to be charged against the current period’s earnings to maintain the allowance for loan losses at a level that we consider adequate in relation to the estimated losses inherent in the loan portfolio.

Three and Six Months Ended June 30,2015 and 2014. For the three months ended June 30,2015, the provision for loan losses was $3.8 million, an increase of $0.6 million, or 19.3%, compared to the three months ended June 30,2014. For the six months ended June 30,2015, the provision for loan losses was $9.2 million, an increase of $3.1 million, or 50.6%, compared to the six months ended June 30,2014.

The higher provision for the three and six months ended June 30,2015 reflected the 31.6% growth in our loan portfolio from June 30, 2014 and higher net charge offs, which were lower than historical experience in 2014 but more reflective of historical experience during the three and six months ended June 30,2015. At June 30,2015, nonperforming loans totaled $17.9 million, or 1.18%, of total loans compared to $17.2 million, or 1.28%, of total loans, at December 31, 2014, and $12.3 million, or 1.07%, at June 30,2014. Net loan charge-offs were 0.92% and 0.99%, respectively, of average loans (annualized) for the three and six months ended June 30,2015 compared to 0.25% and 0.54%, respectively, for the three and six months ended June 30,2014. The allowance for loan losses to nonperforming loans at June 30, 2015 was 139.58%, compared to 132.87% at December 31, 2014 and 175.54% at June 30, 2014. Specific loan loss allowances relating to nonperforming loans increased to $8.2 million and were 45.6% of nonperforming loans at June 30,2015, compared to $8.1 million, or 47.0% of nonperforming loans at December 31, 2014 and $6.4 million, or 51.9%, of nonperforming loans at June 30, 2014.

See "Management's Discussion and Analysis of Financial Condition and Results of Operations - Risk Management" for further information about credit risk and credit quality.

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Noninterest Income

Three and Six Months Ended June 30,2015 and 2014.The following tables show the components of noninterest income and the related dollar and percentage changes:

	Three Months Ended June 30,				Change
	2015		2014		Dollars			Percent
	(Dollars in thousands)
Core banking income:
Service charges and fees	$	1,325	$	1,126	$	199		17.7	%
Foreign exchange fees	1,620		1,363		257			18.9
Credit card and merchant income	1,100		765		335			43.8
Letter of credit fees	455		297		158			53.2
Client investment fees(1)	172		65		107			164.6
Loan documentation fees(1)	115		96		19			19.8
Total core banking noninterest income	4,787		3,712		1,075			29.0
Net gain on securities	1,025		38		987			2,597.4
Warrant income	239		21		218			1,038.1
Gain on sale of loans	592		249		343			137.8
Bank owned life insurance	424		317		107			33.8
Other	565		2,035		(1,470		)	(72.2	)
Total noninterest income	$	7,632	$	6,372	$	1,260		19.8	%

(1) Included in other noninterest income in the consolidated statements of income.

	Six Months Ended June 30,				Change
	2015		2014		Dollars			Percent
	(Dollars in thousands)
Core banking income:
Service charges and fees	$	2,583	$	2,194	$	389		17.7	%
Foreign exchange fees	3,338		3,004		334			11.1
Credit card and merchant income	2,121		1,401		720			51.4
Letter of credit fees	697		812		(115		)	(14.2	)
Client investment fees(1)	305		106		199			187.7
Loan documentation fees(1)	195		233		(38		)	(16.3	)
Total core banking noninterest income	9,239		7,750		1,489			19.2
Net gain on securities	821		4		817			20,425.0
Warrant income	701		2,216		(1,515		)	(68.4	)
Gain on sale of loans	1,398		502		896			178.5
Bank owned life insurance	859		607		252			41.5
Other(1)	826		2,432		(1,606		)	(66.0	)
Total noninterest income	$	13,844	$	13,511	$	333		2.5	%

(1) Included in other noninterest income in the consolidated statements of income.

Core banking noninterest income represents recurring income from traditional banking services provided to our customers (see "Non-GAAP Financial Measures"). The increase in core banking noninterest income for the three and six months ended June 30,2015, was primarily due to an increased customer base combined with increased utilization of our core banking services by our customers. Service charges and fees represent fees earned on our deposit accounts. Foreign exchange fees are primarily transaction-based fees earned from our customers for performing foreign currency-based transactions on their behalf.

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Credit card and merchant income represents fees earned on credit card accounts and transactions. Letters of credit fees represent fees charged to issue and process letters of credit for customers. Client investment fees represent fees charged to customers for asset management services.

The increases in service charges and fees for the three and six months ended June 30,2015 compared to the same periods in 2014 reflects the increase in deposits. Higher foreign exchange fees were driven by increases in our customer's foreign currency-based transactions. The increase in credit card and merchant income was driven by growth in credit card accounts. Credit card balances outstanding were $23.4 million, $18.0 million and $15.0 million at June 30,2015, December 31, 2014 and June 30,2014, respectively. Letters of credit fees are driven by the volume of letters of credit. The decrease for the six months ended June 30,2015 compared to the six months ended June 30,2014 reflects the impact of higher than typical volume of letters of credit in the first quarter of 2014. Client investment fees have increased as a result of the strong growth in client investment assets under management.

Total noninterest income increased $1.3 million compared to the three months ended June 30,2014, as the increases in core banking noninterest income and the net gain on securities were partially offset by a $1.1 million decrease in unrealized gains from our venture capital fund investments. An increase in the gain on sale of loans and higher warrant income also contributed to higher noninterest income compared to the three months ended June 30,2014. Total noninterest income increased $0.3 million compared to the six months ended June 30,2014, as increases in core banking noninterest income, the net gain on securities and the gain on sale of loans were largely offset by decreases of in warrant income and other noninterest income. The decrease in other noninterest income was driven by a $1.1 million decrease in the unrealized gains from our venture capital fund investments and $0.5 million in fees earned in 2014 on the Square 1 Venture 1, L.P. management contract that was sold on April 1, 2014. The increases in the net gain on securities for the three and six months ended June 30,2015 were primarily due to gains on sales of mortgage-backed securities during the three months ended June 30,2015. The higher gains on sale of loans for the three and six months ended June 30,2015 were due to our strategic decision to sell more SBA loans from our loan portfolio.

Warrant income includes income realized upon the exercise of a warrant, as well as unrealized gains and losses from the quarterly mark-to-market of our warrant portfolio. The timing and volume of successful liquidity events, including IPOs, for the clients in which we had taken warrant positions, and changes in the fair value of our equity warrant assets drive variances in warrant income. The variances in warrant income demonstrate the volatility of this income which is created, in part, by the erratic nature of public equity markets and their receptivity to IPOs.

The following tables show the components of warrant income and the period-to-period changes (see further discussion of our equity warrant assets in Note 14 to the interim consolidated financial statements):

	Three Months Ended June 30,						Change
	2015			2014			Dollars			Percent
	(Dollars in thousands)
Equity warrant assets:
Net gains on exercise of equity warrant assets	$	156		$	2,158		$	(2,002	)	(92.8	)%
Non-monetized write off of warrant assets	(66		)	(97		)	31			32.0
Net realized gains on equity warrants	90			2,061			(1,971		)	(95.6	)
Change in fair value	149			(2,040		)	2,189			107.3
Warrant income	$	239		$	21		$	218		1,038.1	%

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	Six Months Ended June 30,						Change
	2014			2013			Dollars			Percent
	(Dollars in thousands)
Equity warrant assets:
Net gains on exercise of equity warrant assets	$	895		$	3,016		$	(2,121	)	(70.3	)%
Non-monetized write off of warrant assets	(125		)	(176		)	51			29.0
Net realized gains on equity warrants	770			2,840			(2,070		)	(72.9	)
Change in fair value	(69		)	(624		)	555			88.9
Warrant income	$	701		$	2,216		$	(1,515	)	(68.4	)%

During the three and six months ended June 30,2015, our net realized gains were primarily driven by equity warrants in private companies that experienced liquidity events, such as an acquisition. During the three months ended June 30,2015, we did not exercise any warrants for equity securities and realized warrant gains in 13 companies. During the six months ended June 30,2015, we exercised warrants with a total value of $33 thousand and received equity securities in one publicly traded company that conducted an IPO in 2015 and realized gains in 29 companies.

During the three months ended June 30,2014, we realized warrant gains in 20 companies, including the monetization of warrants and a realized gain of $0.8 million on warrants exercised upon expiration of the respective lock-up periods that we held in one portfolio company client that conducted IPOs. During the six months ended June 30,2014, we realized warrant gains in 33 companies, including the monetization of warrants and a realized gain of $0.8 million on warrants exercised upon expiration of the respective lock-up periods that we held in three portfolio company client that conducted IPOs. We also exercised warrants with a total value of $1.4 million and received equity securities in four publicly traded companies during the three and six months ended June 30, 2014.

Noninterest Expense

Three and Six Months Ended June 30,2015 and 2014. The following table shows the components of noninterest expense and the related dollar and percentage changes:

	Three Months Ended June 30,				Change
	2015		2014		Dollars			Percent
	(Dollars in thousands)
Personnel	$	12,541	$	10,725	$	1,816		16.9	%
Occupancy	880		773		107			13.8
Data processing	1,049		918		131			14.3
Furniture and equipment	793		660		133			20.2
Advertising and promotions	383		342		41			12.0
Professional fees	1,089		786		303			38.5
Telecommunications	286		285		1			0.4
Travel	285		292		(7		)	(2.4	)
FDIC assessment	497		347		150			43.2
Merger-related expenses	792		—		792			100.0
Other	1,712		1,472		240			16.3
Total noninterest expense	$	20,307	$	16,600	$	3,707		22.3	%

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	Six Months Ended June 30,				Change
	2015		2014		Dollars		Percent
	(Dollars in thousands)
Personnel	24,768		$	21,359	$	3,409	16.0	%
Occupancy	1,703		1,513		190		12.6
Data processing	1,986		1,740		246		14.1
Furniture and equipment	1,558		1,362		196		14.4
Advertising and promotions	624		617		7		1.1
Professional fees	1,901		1,387		514		37.1
Telecommunications	577		545		32		5.9
Travel	482		458		24		5.2
FDIC assessment	916		752		164		21.8
Merger-related expenses	1,004		—		1,004		100.0
Other	3,125		2,450		675		27.6
Total noninterest expense	$	38,644	$	32,183	$	6,461	20.1	%

The increases in noninterest expense three and six months ended June 30,2015 compared to the three and six months ended June 30,2014 were primarily due to higher personnel expenses, higher professional fees and merger-related expenses. Personnel represented 61.8% of our total noninterest expense and increased $1.8 million, or 16.9%, for the three months ended June 30,2015 compared to the three months ended June 30,2014 and increased $3.4 million, or 16.0%, for the six months ended June 30,2015 compared to the six months ended June 30,2014. The increase in personnel expense primarily resulted from an increase in our full-time equivalent employees to 280 at June 30,2015, from 258 at December 31, 2014 and 245 at June 30,2014, to drive and support our balance sheet and income growth and higher incentive compensation expense. Over the past year we have added 9 venture bankers and client managers in key markets, including California, New York, Boston and Chicago. In addition, our occupancy and furniture and equipment expenses have increased in 2015 due to the addition of a new loan production office in Minneapolis which opened in the first quarter of 2015, San Francisco which opened in the second quarter of 2014, and Chicago which opened in the fourth quarter of 2014, as well as an increase in our lease expenses for our New York loan production office. Data processing fees have also increased to support our overall growth in connection with upgrades for our lending and credit operations. These updates have and will continue to result in increased expenses in 2015 as we continue to hire additional bankers and invest in our franchise. Higher other noninterest expense was primarily driven by increases of $0.1 million and $0.5 million, respectively, in the provision for unfunded credit commitments for the three and six months ended June 30,2015, compared to the respective periods in the prior year. The provision for unfunded credit commitments was $0.6 million and $1.0 million, respectively, for the three and six months ended June 30,2015.

Income Tax Provision

Three and Six Months Ended June 30,2015 and 2014. Income tax expense increased $1.6 million, or 46.4%, for the three months ended June 30,2015 as compared to the same period in the prior year, primarily due to a $3.5 million, or 30.2%, increase in pre-tax income and a higher effective tax rate. Income tax expense increased $1.8 million, or 26.4%, for the six months ended June 30,2015 as compared to the same period in the prior year, primarily due to a $3.9 million, or 17.4%, increase in pre-tax income and a higher effective tax rate. Our effective tax rate increased to 33.7% for the three months ended June 30,2015 from 30.0% for the three months ended June 30,2014 and increased to 31.9% for the six months ended June 30,2015 from 29.6% for the six months ended June 30,2014 due to an increase in the proportion of taxable income to nontaxable income.

DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION

Our total assets increased $817.6 million, or 26.4%, to $3.9 billion at June 30,2015, from $3.1 billion at December 31, 2014, primarily due to deposit growth of $787.2 million, which resulted in $301.4 million in additional period end cash and cash equivalents, a $339.3 million increase in our investment securities portfolio, and a $169.6 million increase in our loan portfolio.

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Our loan and deposit portfolios include entrepreneurial companies at all stages of their life cycles, as well as venture firms. The following table provides a summary of total loans outstanding, total unfunded loan commitments and deposit balances by stage and type at June 30, 2015 and December 31, 2014:

	June 30, 2015
	Loans Outstanding					Unfunded Loan Commitments				Deposit Balances
	Amount			Percent		Amount		Percent		Amount		Percent
	(Dollars in thousands)
Stage:
Early	$	322,153		21.13	%	$	191,305	13.37	%	$	1,724,307	48.38	%
Expansion	706,156			46.31		293,630		20.51		910,224		25.54
Late	175,213			11.49		275,213		19.23		379,729		10.66
Total portfolio company	1,203,522			78.93		760,148		53.11		3,014,260		84.58
Venture capital/private equity	216,268			14.18		642,839		44.91		548,957		15.40
SBA and USDA	81,673			5.36		2,735		0.19		547		0.02
Credit cards	23,379			1.53		25,669		1.79		—		—
Total	1,524,842			100.00	%	$	1,431,391	100.00	%	$	3,563,764	100.00	%
Less unearned income	(8,810		)
Total loans, net of unearned income	$	1,516,032

	December 31, 2014
	Loans Outstanding					Unfunded Loan Commitments				Deposit Balances
	Amount			Percent		Amount		Percent		Amount		Percent
	(Dollars in thousands)
Stage:
Early	$	235,649		17.40	%	$	124,973	10.14	%	$	1,255,847	45.23	%
Expansion	620,456			45.81		250,327		20.32		590,974		21.29
Late	234,486			17.31		206,492		16.76		347,666		12.52
Total portfolio company	1,090,591			80.52		581,792		47.22		2,194,487		79.04
Venture capital/private equity	169,143			12.49		613,594		49.80		581,491		20.94
SBA and USDA	76,622			5.66		6,953		0.57		574		0.02
Credit cards	17,980			1.33		29,739		2.41		—		—
Total	1,354,336			100.00	%	$	1,232,078	100.00	%	$	2,776,552	100.00	%
Less unearned income	(7,887		)
Total loans, net of unearned income	$	1,346,449

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Loans

The following table presents the loan balances and associated percentage of each category of loans within our loan portfolio at the dates indicated:

	June 30, 2015					December 31, 2014
	Amount			Percent		Amount			Percent
	(Dollars in thousands)
Commercial loans:
Technology	$	739,016		48.47	%	$	631,979		46.66	%
Life sciences	307,240			20.15		274,057			20.24
Asset-based loans	143,204			9.39		177,701			13.12
Venture capital/private equity	216,268			14.18		169,143			12.49
SBA and USDA	36,926			2.42		35,609			2.63
Other	14,062			0.93		6,854			0.50
Total commercial loans	1,456,716			95.54		1,295,343			95.64
Real estate loans:
SBA and USDA	37,995			2.49		36,978			2.73
Total real estate loans	37,995			2.49		36,978			2.73
Construction:
SBA and USDA	6,752			0.44		4,035			0.30
Total construction loans	6,752			0.44		4,035			0.30
Credit cards	23,379			1.53		17,980			1.33
Total loans	1,524,842			100.00	%	1,354,336			100.00	%
Less unearned income(1)	(8,810		)			(7,887		)
Total loans, net of unearned income	$	1,516,032				$	1,346,449

(1) Unearned income consists of unearned loan fees, the discount on SBA loans and the unearned initial warrant value.

The 12.5% increase in commercial loans from December 31, 2014 to June 30, 2015 was primarily driven by increases in total loans to venture-backed companies consisting of the technology and life sciences client sector and asset-based loans, and the venture firm client industry segment. Total loans to venture-backed companies were up $105.7 million, or 9.8%, as increases in loans in the life sciences and technology segments were partially offset by an increase in payoffs in asset-based loans and loans to venture firms were up $47.1 million, or 27.9%, at June 30, 2015 compared to December 31, 2014. Within our commercial loan portfolio, our loans to venture firm clients fluctuate from period-to-period based on funding needs driven by investment cycles and timing. The amount of loan commitments that are utilized by these clients vary during the year and often increase at the end of the year when these clients may increase the amount drawn on their lines of credit for various business reasons.

Growth in SBA and USDA loans also contributed to the overall growth in commercial loans from December 31, 2014 to June 30, 2015. Total SBA and USDA loans increased $5.1 million, or 6.6%, from December 31, 2014 to June 30, 2015. We also made a strategic decision to sell more SBA loans in our loan portfolio during the first quarter of 2015. At June 30, 2015, SBA and USDA loans represented 5.4% of our loan portfolio compared to 5.7% at December 31, 2014.

Loan Concentration

Loan concentrations may exist when there are borrowers engaged in similar activities or when there is a diverse group of borrowers that could be similarly impacted by economic or other conditions.

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The breakdown of total loans by industry sector at June 30, 2015 and December 31, 2014, is as follows:

	June 30, 2015					December 31, 2014
	Amount			Percent		Amount			Percent
	(Dollars in thousands)
Venture portfolio industry:
Software	$	256,180		16.90	%	$	193,622		14.38	%
Business products and services	127,602			8.42		118,451			8.80
Hardware	95,682			6.31		103,667			7.70
Consumer products and services	115,706			7.63		81,603			6.06
Media and telecom	102,224			6.74		86,187			6.40
Biotech	122,146			8.06		103,818			7.71
Healthcare services	80,536			5.31		76,094			5.65
IT services	67,865			4.48		61,805			4.59
Medical devices and equipment	73,421			4.84		65,714			4.88
Financial services	41,832			2.76		37,919			2.82
Other industries	120,335			7.94		151,136			11.22
Total venture portfolio industry	1,203,529			79.39		1,080,016			80.21
Venture capital/private equity	216,268			14.26		169,143			12.56
SBA and USDA	81,673			5.39		76,622			5.69
Credit cards	23,379			1.54		17,980			1.34
Other (overdrafts and in-process)	(7		)	—		10,575			0.79
Total loans	1,524,842			100.58		1,354,336			100.59
Less unearned income	(8,810		)	(0.58	)	(7,887		)	(0.59	)
Loans, net of unearned income	$	1,516,032		100.00	%	$	1,346,449		100.00	%

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The following tables provide a summary of total loans by size and category. The breakout of the categories is based on total client balances (individually or in the aggregate) at June 30, 2015 and December 31, 2014:

	June 30, 2015
	Total				Less than $5 Million			$5 Million - $10 Million			Greater than $10 Million
	Amount			Number	Amount		Number	Amount		Number	Amount		Number
	(Dollars in thousands)
Commercial loans:
Technology	$	739,016		273	$	381,897	231	$	231,276	33	$	125,843	9
Life sciences	307,240			78	124,039		56	106,934		17	76,267		5
Asset-based loans	143,204			92	33,930		81	42,274		6	67,000		5
Venture capital/private equity	216,268			78	66,159		63	67,019		9	83,090		6
SBA and USDA	36,926			60	36,926		60	—		—	—		—
Other	14,062			13	9,062		12	5,000		1	—		—
Total commercial loans	1,456,716			594	652,013		503	452,503		66	352,200		25
Real estate loans:
SBA and USDA	37,995			66	32,191		65	5,804		1	—		—
Total real estate loans	37,995			66	32,191		65	5,804		1	—		—
Construction loans:
SBA and USDA	6,752			5	6,752		5	—		—	—		—
Total construction loans	6,752			5	6,752		5	—		—	—		—
Credit cards	23,379			597	23,379		597	—		—	—		—
Total loans	1,524,842			1,262	$	714,335	1,170	$	458,307	67	$	352,200	25
Less unearned income	(8,810		)
Loans, net of unearned income	$	1,516,032

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	December 31, 2014
	Total				Less than $5 Million			$5 Million - $10 Million			Greater than $10 Million
	Amount			Number	Amount		Number	Amount		Number	Amount		Number
	(Dollars in thousands)
Commercial loans:
Technology	$	631,979		256	$	375,727	224	$	177,063	26	$	79,189	6
Life sciences	274,057			76	113,053		57	87,404		14	73,600		5
Asset-based loans	177,701			67	32,717		54	43,481		6	101,503		7
Venture firm	169,143			72	49,099		61	31,558		5	88,486		6
SBA and USDA	35,609			50	35,609		50	—		—	—		—
Other	6,854			11	6,854		11	—		—	—		—
Total commercial loans	1,295,343			532	613,059		457	339,506		51	342,778		24
Real estate loans:
SBA and USDA	36,978			60	31,120		59	5,858		1	—		—
Total real estate loans	36,978			60	31,120		59	5,858		1	—		—
Construction loans:
SBA and USDA	4,035			4	4,035		4	—		—	—		—
Total construction loans	4,035			4	4,035		4	—		—	—		—
Credit cards	17,980			519	17,980		519	—		—	—		—
Total loans	1,354,336			1,115	$	666,194	1,039	$	345,364	52	$	342,778	24
Less unearned income	(7,887		)
Loans, net of unearned income	$	1,346,449

Loan Maturity

At June 30, 2015, 89.7%, or $1.4 billion, of our total outstanding gross loans were variable rate loans that adjust at specified dates based on our prime lending rate or other variable indices, compared to 91.5%, or $1.2 billion, at December 31, 2014. At June 30, 2015, just over 38% of the loans had floors above the floating rate coupon. After an increase in rates of 100 bps, only 6% of these loans will continue to have floors above the floating rate coupon.

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The following table sets forth the remaining contractual maturity distribution of our gross loan portfolio, by industry sector, at June 30, 2015 and December 31, 2014, for fixed and variable rate loans:

	June 30, 2015
	Remaining Contractual Maturity of Gross Loans
	One Year or Less		After One Year and Through Five Years		After Five Years		Total
	(In thousands)
Fixed-rate loans:
Commercial loans:
Technology	$	1,821	$	34,868	$	—	$	36,689
Life sciences	716		79,802		—		80,518
Asset-based loans	26,585		137		—		26,722
Venture capital/private equity	—		261		—		261
SBA and USDA	—		—		763		763
Other	2,500		—		3,950		6,450
Total commercial loans	31,622		115,068		4,713		151,403
Real estate loans:
SBA and USDA	—		—		6,065		6,065
Total real estate loans	—		—		6,065		6,065
Total construction loans	—		—		—		—
Credit cards	—		—		—		—
Total fixed-rate loans	$	31,622	$	115,068	$	10,778	$	157,468
Variable-rate loans:
Commercial loans:
Technology	$	342,787	$	359,540	$	—	$	702,327
Life sciences	75,171		151,551		—		226,722
Asset-based loans	102,228		14,254		—		116,482
Venture capital/private equity	170,387		41,729		3,891		216,007
SBA and USDA	—		359		35,804		36,163
Other	2,612		5,000		—		7,612
Total commercial loans	693,185		572,433		39,695		1,305,313
Real estate loans:
SBA and USDA	—		33		31,897		31,930
Total real estate loans	—		33		31,897		31,930
Construction loans:
SBA and USDA	—		—		6,752		6,752
Total construction loans	—		—		6,752		6,752
Credit cards	23,379		—		—		23,379
Total variable rate loans	$	716,564	$	572,466	$	78,344	1,367,374
Less unearned income							(8,810		)
Total loans, net of unearned income							$	1,516,032

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	December 31, 2014
	Remaining Contractual Maturity of Gross Loans
	One Year or Less		After One Year and Through Five Years		After Five Years		Total
	(In thousands)
Fixed-rate loans:
Commercial loans:
Technology	$	2,320	$	24,967	$	—	$	27,287
Life sciences	500		56,138		—		56,638
Asset-based loans	24,669		622		—		25,291
Venture capital/private equity	—		337		—		337
SBA and USDA	—		—		795		795
Other	—		—		611		611
Total commercial loans	27,489		82,064		1,406		110,959
Real estate loans:
SBA and USDA	1,008		—		3,363		4,371
Total real estate loans	1,008		—		3,363		4,371
Total fixed-rate loans	$	28,497	$	82,064	$	4,769	$	115,330
Variable-rate loans:
Commercial loans:
Technology	$	286,017	$	318,675	$	—	$	604,692
Life sciences	57,046		160,373		—		217,419
Asset-based loans	100,010		52,400		—		152,410
Venture capital/private equity	133,303		32,596		2,907		168,806
SBA and USDA	235		180		34,399		34,814
Other	2,998		—		3,245		6,243
Total commercial loans	579,609		564,224		40,551		1,184,384
Real estate loans:
SBA and USDA	—		36		32,571		32,607
Total real estate loans	—		36		32,571		32,607
Construction loans:
SBA and USDA	—		—		4,035		4,035
Total construction loans	—		—		4,035		4,035
Credit cards	17,980		—		—		17,980
Total variable rate loans	$	597,589	$	564,260	$	77,157	1,239,006
Less unearned income							(7,887		)
Total loans, net of unearned income							$	1,346,449

Upon maturity, loans satisfying our credit quality standards may be renewed. Renewals are subject to the same underwriting and credit administration practices as we utilize for new loans. It is not our practice to grant loans with unconditional extension or renewal terms.

Investment Securities

Investment securities totaled $1.9 billion at June 30, 2015, an increase of $339.3 million, or 21.3%, compared to $1.6 billion at December 31, 2014. See Notes 3 and 15 to the unaudited interim consolidated financial statements.

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Our investment securities portfolio is comprised of both available-for-sale securities and securities that we intend to hold to maturity. We purchase securities for our investment securities portfolio to manage interest rate risk, ensure a stable source of liquidity, and to provide a steady source of income in excess of our cost of funds.

Our available-for-sale securities portfolio totaled $1.5 billion at June 30, 2015, an increase of $246.8 million, or 19.1%, compared to $1.3 billion at December 31, 2014.

Legacy non-agency mortgage-backed securities are those that were purchased prior to 2008 before the onset of the financial crisis and represent $17.5 million of the $185.1 million of non-agency mortgage-backed securities held at June 30, 2015, compared to $18.7 million of the $173.1 million of non-agency mortgage-backed securities held at December 31, 2014. The $17.5 million of legacy non-agency mortgage-backed securities purchased before 2008 is spread across multiple originators and issuers. There are 16 unique securities that have an average balance of $1.1 million, with the largest single security having a fair value of $2.8 million at June 30, 2015. The $17.5 million of legacy non-agency mortgage-backed securities have been impaired $5.9 million and represent 0.9% of the $1.9 billion in investment securities at June 30, 2015. The underlying loans in the group are comprised of prime (13%), Alt-A (38%) and sub-prime (49%) loans.

The balance of the $185.1 million is in investment grade non-agency mortgage-backed securities that have been purchased since 2013. The loans underlying these securities are comprised of prime (62%), Alt-A (18%) and sub-prime (20%) loans.

Other asset-backed securities totaled $107.0 million at June 30, 2015, compared to $47.6 million at December 31, 2014. Other asset-backed securities are investment grade and are comprised of student loan securities, a trust preferred collateralized debt obligation ("CDO"), venture debt obligations and securities with underlying consumer loans. The loans underlying the venture debt obligations are similar to the loans in our venture banking portfolio and have an estimated average life of one year or less.

We monitor our non-agency mortgage-backed securities and other asset-backed securities on an ongoing basis. Principal repayment, delinquencies, prepayments and default rates are tracked monthly. In addition, we perform a discounted cash flow analysis for our non-agency mortgage-backed securities on a quarterly basis as part of our other-than-temporary impairment ("OTTI") review. The student loan securities and the trust preferred CDO are monitored semi-annually.

Our held to maturity securities portfolio is mainly comprised of municipal bonds. Our held to maturity securities portfolio had an amortized cost of $392.9 million at June 30,2015, an increase of $92.4 million, or 30.8%, compared to $300.4 million at December 31, 2014. The increase in this portfolio was primarily due to our purchase of new municipal bond securities and agency mortgage backed securities that we intend to hold until they are either called or reach maturity.

At June 30,2015, the duration of our available-for-sale securities portfolio was approximately 2.3 years and the overall investment securities portfolio duration was 3.0 years.

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The following table sets forth the stated maturities and weighted average yields of debt securities at June 30,2015. Weighted average yields on tax-exempt securities are presented on a tax equivalent basis. While not reflected in the table below, 26.0% of the investment portfolio is either floating rate or adjustable rate securities and will reprice either immediately or within the first year based on the repricing of the underlying loans.

			June 30, 2015
			Less than One Year				After One to Five Years				After Five to Ten Years				After Ten Years
	Total Amortized Cost		Amortized Cost		Average Yield		Amortized Cost		Average Yield		Amortized Cost		Average Yield		Amortized Cost		Average Yield
	(Dollars in thousands)
Available-for sale-securities:
U.S. Treasuries	$	159,264	$	—			$	159,264	1.02	%	$	—			$	—
Agency direct obligations	30,323		20,272		0.69		10,051		0.93		—				—
SBA pools	162,014		—				4,136		1.59		82,765		1.59		75,113		1.59
Agency mortgage-backed securities	666,405		—				2,398		0.51		29,622		1.64		634,385		2.49
Municipal bonds	97,417		—				—				15,185		3.88		82,232		4.43
Corporates	117,397		13,928		2.50		41,843		1.31		12,954		1.37		48,672		2.54
Non-agency mortgage-backed securities	185,662		—				701		3.62		7,417		3.96		177,544		3.21
Other asset-backed securities	107,495		3,516		1.89		36,755		3.20		26,387		2.81		40,837		2.40
Total available for sale securities	$	1,525,977	$	37,716	1.47	%	$	255,148	1.39	%	$	174,330	2.07	%	$	1,058,783	2.70	%
Held-to-maturity securities:
Agency mortgage-backed securities	$	102,368	$	—			$	—			$	—			$	102,368	3.85	%
Municipal bonds	230,582		—				—				18,295		3.81		212,287		5.49
Corporates	59,922		—				—				—				59,922		4.34
Total held-to-maturity	$	392,872	$	—	—	%	$	—	—	%	$	18,295	3.81	%	$	374,577	4.86	%
Total securities	$	1,918,849	$	37,716	1.47	%	$	255,148	1.39	%	$	192,625	2.23	%	$	1,433,360	3.26	%

Derivatives

Derivative instruments are recorded as a component of other assets and other liabilities on the balance sheet.

Equity Warrant Assets. In most cases, we seek equity warrants in connection with extending loan commitments to our customers. In general, the equity warrants entitle us to purchase a specific number of shares of a client’s stock at a specific price over a specified time period. The warrants may also include contingent provisions which provide for additional shares to be purchased at a specific price if defined future events occur, such as future rounds of equity financing by the client, or additional borrowings by the client. These warrants are obtained at the inception of a loan facility or the amendment of a loan facility. These warrants are not obtained in lieu of other fees, interest or payments. These warrants potentially provide an additional return, in addition to the traditional loan yield from interest and fees, in the event of a liquidity event of the borrowing company. The grant date fair values of equity warrants received in connection with extending loan commitments are considered to be loan fees and are recognized over the life of the loan commitment as an adjustment to the loan yield through loan interest income. Any changes from the grant date in the fair value of equity warrant assets are recognized as increases or decreases to warrant valuation and as net gains or losses in noninterest income during the period in which the change is recognized. These changes in warrant valuation and related gains or losses may occur as a result of a change in the Black Scholes value of the warrant, or when a portfolio company completes an initial public offering on a publicly reported market or is acquired. We may exercise these equity warrant assets for either shares or cash. When a private company goes public there is

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often a lock-up period requiring us to hold our equity position in a publicly traded security until the expiration of the lock-up period. Shares received from the exercise of warrants and subject to lock-up agreements are held as equity securities in our available for sale portfolio.

Our equity warrants portfolio is primarily comprised of warrants in non-public companies and our practice generally is to monetize our positions as soon as a liquidity event occurs. Often there is a lock-up period requiring us to hold our equity position in a publicly traded security until the expiration of the lock-up period. Warrants held, which amounted to $5.1 million and $4.3 million in 484 and 461 companies at June 30, 2015 and December 31, 2014, respectively, are shown as warrant valuation in the accompanying consolidated balance sheets. At June 30, 2015, the $5.1 million valuation on warrants held included $0.6 million in equity securities of nine publicly traded companies compared to $0.2 million held in equity securities of six publicly traded companies at December 31, 2014.

During the three months ended June 30,2015, we did not exercise any warrants for equity securities. During the six months ended June 30,2015, we exercised warrants with a total value of $33 thousand and received equity securities in one publicly traded company. During the three and six months ended June 30,2014, we exercised warrants with a total value of $1.4 million and received equity securities in four publicly traded companies of which one was monetized for $0.3 million.

At June 30, 2015, the fair value of equity securities included in equity securities within our available-for-sale investments obtained through the exercise of warrants and still held was $0.1 million, compared to $0.9 million at December 31, 2014 (see Note 3). See Notes 14 and 15 and "Results of Operations - Noninterest Income" for further information regarding our equity warrant assets.

Foreign Exchange Forward Contracts. We enter into foreign exchange forward contracts with clients involved in foreign activities, either as the purchaser or seller, depending upon the clients’ needs. For each forward contract entered into with our clients, we enter into an opposite way forward contract with a correspondent bank, which mitigates the risk of fluctuations in currency rates. At June 30, 2015, we had $9.4 million in gross notional customer outstanding forward contracts and an offsetting $9.3 million in gross notional correspondent bank outstanding forward contracts. At December 31, 2014, we had $5.7 million in gross notional customer outstanding forward contracts and an offsetting $5.6 million in gross notional correspondent bank outstanding forward contracts.

Deposits

The following table sets forth the composition of our deposits at June 30, 2015 and December 31, 2014:

	June 30, 2015				December 31, 2014
	Amount		Percent		Amount		Percent
	(Dollars in thousands)
Period-end:
Noninterest-bearing demand deposits	$	2,372,673	66.58	%	$	1,851,004	66.67	%
Interest-bearing deposits:
Demand deposits	100,496		2.82		71,598		2.58
Money market	1,081,211		30.34		837,630		30.16
Time deposits	9,384		0.26		16,320		0.59
Total period end deposits	$	3,563,764	100.00	%	$	2,776,552	100.00	%

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The following tables set forth the composition of our average deposits for the three and six months ended June 30,2015 and 2014:

	Three Months Ended June 30,
	2015				2014
	Amount		Percent		Amount		Percent
	(Dollars in thousands)
Average:
Noninterest-bearing demand deposits	$	2,123,531	67.08	%	$	1,518,640	64.38	%
Interest-bearing deposits:
Demand deposits	96,817		3.06		117,542		4.98
Money market	933,385		29.49		692,727		29.36
Time deposits	11,733		0.37		30,133		1.28
Total average deposits	$	3,165,466	100.00	%	$	2,359,042	100.00	%

	Six Months Ended June 30,
	2015				2014
	Amount		Percent		Amount		Percent
	(Dollars in thousands)
Average:
Noninterest-bearing demand deposits	$	1,994,391	66.69	%	$	1,455,126	64.52	%
Interest-bearing deposits:
Demand deposits	94,620		3.16		117,097		5.19
Money market	887,462		29.68		654,990		29.04
Time deposits	14,186		0.47		28,138		1.25
Total average deposits	$	2,990,659	100.00	%	$	2,255,351	100.00	%

Our deposits increased to $3.6 billion at June 30, 2015, from $2.8 billion at December 31, 2014, an increase of $787.2 million, or 28.4%. This increase was primarily due to growth of our client base and a continued strong funding environment for venture-backed firms. Our noninterest-bearing deposits increased $521.7 million, or 28.2%, and our interest-bearing deposits increased $265.5 million, or 28.7%, during the period.

At June 30, 2015, the aggregate balance of time deposit accounts individually equal to or greater than $100,000 totaled $9.2 million, of which $8.2 million is scheduled to mature within one year. The remaining $1.0 million is scheduled to mature in 2017.

Client Investment Funds

We utilize alternative cash investment vehicles to manage our on-balance sheet deposit growth, which tends to be volatile as is typical in the market in which we operate. For example, we offer our clients alternative cash investment vehicles such as sweep accounts and investments in the CDARS, the latter of which allows us to place client deposits in one or more insured depository institutions. Square 1 Asset Management, our registered investment advisor, offers customized solutions to our clients that are tailored to meet the unique corporate cash management needs of entrepreneurial companies and venture firms. The growth in our client investment funds reflects our continuing ability to manage deposits off balance sheet in a manner that benefits our clients and the Bank. We expect to continue to manage our on-balance sheet deposit growth through these alternative investment vehicles for our clients and to grow the amount of assets under management by Square 1 Asset Management.

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The following table sets forth the composition of our client investment funds at June 30, 2015 and December 31, 2014:

	June 30, 2015		December 31, 2014		% Change
Period-end:	(Dollars in thousands)
Client investment assets under management	$	1,222,834	$	976,075	25.3	%
Sweep money market funds	458,683		404,357		13.4
CDARS	31,507		56,201		(43.9	)
Total period-end client investment funds	$	1,713,024	$	1,436,633	19.2	%

The following tables set forth the composition of average client investment funds for the three and six months ended June 30,2015 and 2014:

	Three Months Ended June 30,
	2015		2014		% Change
Average:	(Dollars in thousands)
Client investment assets under management	$	1,089,403	$	210,551	417.4	%
Sweep money market funds	466,521		301,154		54.9
CDARS	36,294		238,271		(84.8	)
Total average client investment funds	$	1,592,218	$	749,976	112.3	%

	Six Months Ended June 30,
	2015		2014		% Change
Average:	(Dollars in thousands)
Client investment assets under management	$	1,017,224	$	177,015	474.7
Sweep money market funds	457,645		305,979		49.6
CDARS	41,585		207,346		(79.9	)
Total average client investment funds	$	1,516,454	$	690,340	119.7

Repurchase Agreements and Borrowings

See Note 7 for further information regarding our repurchase agreements and Note 8 for further information regarding our borrowings.

Off-Balance Sheet Arrangements

In the normal course of operations, we engage in a variety of financial transactions that, in accordance with accounting principles generally accepted in the United States of America, are not recorded in our financial statements. These transactions involve, to varying degrees, elements of credit, interest rate and liquidity risk. Such transactions are used primarily to manage customers’ requests for funding and take the form of loan commitments, lines of credit and letters of credit.

The contractual amounts of commitments to extend credit represent the amounts of potential accounting loss should the contract be fully drawn upon, the customer defaults and any existing collateral has no value. We use the same credit policies in making commitments and conditional obligations as we do for on-balance sheet instruments. Financial instruments whose contract amounts represent credit risk at June 30, 2015 and December 31, 2014, are as follows:

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	June 30, 2015		December 31, 2014
	(In thousands)
Commitments to extend credit(1):
Future loan commitments	$	1,431,391	$	1,232,078
Standby letters of credit(2)	78,518		68,372
Total commitments	$	1,509,909	$	1,300,450

(1) 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 may require payment of a fee and generally have fixed expiration dates or other termination clauses.

(2) Standby letters of credit are conditional commitments issued to guarantee the performance of a customer to a third party.

For the three and six months ended June 30,2015, we engaged in no off-balance sheet transactions reasonably likely to have a material effect on our financial condition, results of operations or cash flows.

RISK MANAGEMENT

Overview

Managing risk is an essential part of successfully managing a financial institution. Our most prominent risk exposures are credit risk, interest rate risk and market risk. Credit risk is the risk of not collecting the interest and/or the principal balance of a loan or investment when it is due. Interest rate risk is the potential reduction of net interest income as a result of changes in interest rates. Market risk arises from fluctuations in interest rates that may result in changes in the values of financial instruments, such as available for sale securities, which are accounted for on a mark-to-market basis. Other risks that we face are operational risks, liquidity risks and reputation risk. Operational risks include risks related to fraud, regulatory compliance, processing errors, technology and disaster recovery. Liquidity risk is the possible inability to fund obligations to depositors, lenders or borrowers due to unforeseen circumstances. Reputation risk is the risk that negative publicity or press, whether true or not, could cause a decline in our customer base or revenue.

Credit Risk

Analysis of Nonperforming and Classified Assets. We place loans that are 90 days or more past due as to principal or interest payments on nonaccrual status, or prior to that if we have determined based upon current information available to us that the timely collection of principal or interest is not probable. When a loan is placed on nonaccrual status, any previously recorded interest is reversed and recorded as a reduction of loan interest and fee income. Typically, collections of interest and principal received on a nonaccrual loan are applied to the outstanding principal as determined at the time of collection of the loan.

Troubled debt restructurings occur when debtors are granted concessions we would not otherwise consider, because of economic or legal reasons pertaining to the debtor’s financial difficulties. Such concessions would include, but are not limited to, the transfer of assets or the issuance of equity interests by the debtor to satisfy all or part of the debt, modification of the terms of debt or the substitution or addition of debtor(s).

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The following table provides information with respect to our nonperforming assets and troubled debt restructurings at the dates indicated:

	June 30, 2015			December 31, 2014
	(Dollars in thousands)
Nonaccrual loans:
Commercial loans:
Technology	$	9,992		$	9,487
Life sciences	1,911			2,511
Asset-based loans	—			570
SBA and USDA	539			175
Other	3,343			3,245
Total commercial loans	15,785			15,988
Real estate loans:
SBA and USDA	2,152			1,251
Total real estate loans	2,152			1,251
Total nonaccrual loans	17,937			17,239
Total nonperforming loans	$	17,937		$	17,239
Nonaccrual troubled debt restructurings	$	5,713		$	5,859
Total troubled debt restructurings	6,158			5,859
Less nonaccrual troubled debt restructurings included in total nonaccrual loans	(5,713		)	(5,859		)
Total nonperforming assets and troubled debt restructurings	$	18,382		$	17,239
Total nonperforming loans to total loans	1.18		%	1.28		%
Total nonperforming loans to total assets	0.46		%	0.56		%
Total nonperforming assets and troubled debt restructurings to total assets	0.47		%	0.56		%

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The following tables present the composition of portfolio company nonperforming loans by stage at June 30, 2015 and December 31, 2014:

	June 30, 2015
	Amount		Number	Percent
	(Dollars in thousands)
Stage:
Early	$	8,499	5	55.74	%
Expansion	4,332		3	28.41
Late	2,416		1	15.85
Total portfolio company loans	$	15,247	9	100.00	%

	December 31, 2014
	Amount		Number	Percent
	(Dollars in thousands)
Stage:
Early	$	3,764	3	23.80	%
Expansion	6,398		5	40.46
Late	5,652		2	35.74
Total portfolio company loans	$	15,814	10	100.00	%

At June 30, 2015, our total nonperforming assets and troubled debt restructurings were $18.4 million, a $1.1 million, or 6.6%, increase from December 31, 2014. At June 30, 2015, nonperforming loans represented 1.18% of our total loans and were comprised of 14 credits that had $8.2 million in specific reserves held against them.

At June 30, 2015, our criticized (performing) and impaired loans represented approximately 5.5% of our total gross loans. This compares to 7.5% at December 31, 2014. 54.4% of our criticized and impaired loans at June 30, 2015 are to companies in the technology sector, across all growth stages compared to 55.5% at December 31, 2014. Loans to technology sector companies represented approximately 48.5% of our loan portfolio at June 30, 2015 and 46.7% of our loan portfolio at December 31, 2014. Loans to early and expansion stage portfolio company clients comprised 71.5% of our nonperforming loans at June 30, 2015 compared to 58.9% at December 31, 2014. It is common for an early or expansion stage client’s remaining liquidity to fall temporarily below the threshold necessary for a pass-rated credit during its capital-raising period for a new round of funding. This situation typically lasts only a few weeks and, in our experience, generally resolves itself with a subsequent round of venture funding. As a result, we expect that some of our early-stage and expansion stage clients will be managed through our criticized portfolio during a portion of their life cycle without resulting in net charge-offs.

Management is proactive in its approach to identifying and resolving problem loans and is focused on working with the borrowers and guarantors of these loans to provide loan modifications when warranted. The level of nonperforming assets fluctuates in response to changing economic and market conditions, the relative size and composition of the loan portfolio, as well as management’s degree of success in resolving problem assets.

Interest income that would have been recorded had nonaccruing loans and troubled debt restructurings been current in accordance with their original terms and had been outstanding throughout the period, amounted to $0.3 million and $0.1 million, respectively, for the three months ended June 30,2015, and 2014 and amounted to $0.5 million and $0.3 million, respectively, for the six months ended June 30,2015, and 2014.

Allowance for Loan Losses. The allowance for loan losses, a material estimate which could change significantly in the near-term, is established through a provision for loan losses charged to earnings to account for losses that are inherent in the loan portfolio and estimated to occur, and is maintained at a level that management believes is adequate to absorb losses in the loan portfolio. Loan losses are charged against the allowance for loan losses when management believes that the uncollectibility of the principal loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance for loan losses when received.

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Management’s judgment in determining the adequacy of the allowance is inherently subjective, as it requires estimates that are susceptible to significant revision as more information becomes available and as situations change.

The allowance for loan losses is evaluated on a monthly basis by management and takes into consideration such factors as changes in the nature and volume of the loan portfolio, overall portfolio quality, review of specific problem loans and current economic conditions and trends that may affect the borrower’s ability to repay.

The allowance for loan losses consists of the following key elements:

• Specific allowance for identified impaired loans. For such loans that are identified as impaired, an allowance is established when the discounted cash flows (or collateral value if the loan is collateral dependent) or observable market price of the impaired loan are lower than the carrying value of that loan.

• General valuation allowance, which represents a valuation allowance on the remainder of the loan portfolio, after excluding impaired loans. For this portion of the allowance, loans are reviewed based on industry, stage and structure, and are assigned allowance percentages based on historical loan loss experience adjusted for qualitative factors. Qualitative factors that, in management’s judgment, affect the collectibility of the portfolio as of the evaluation date, may include changes in lending policies and procedures; changes in national and local economic and business conditions, including the condition of various market segments; changes in the nature and volume of the portfolio; changes in the experience, ability and depth of lending management and staff; changes in the volume and severity of past due and classified loans and in the volume of nonaccruals, trouble debt restructurings, and other loan modifications; the existence and effect of any concentrations of credit and changes in the level of such concentrations; and the effect of external factors, such as competition and legal and regulatory requirements, on the level of estimated and inherent credit losses in the Bank’s current portfolio.

The following table sets forth the breakdown of the allowance for loan losses by loan category at the dates indicated:

	June 30, 2015						December 31, 2014
	Amount		% of Allowance of Total Allowance		% of Loans in Category to Total Loans		Amount		% of Allowance of Total Allowance		% of Loans in Category to Total Loans
	(Dollars in thousands)
Commercial loans:
Technology	$	14,459	57.75	%	48.47	%	$	11,904	51.97	%	46.66	%
Life sciences	3,908		15.61		20.15		3,657		15.96		20.24
Asset-based loans	2,161		8.63		9.39		3,364		14.69		13.12
Venture capital/private equity	374		1.49		14.18		250		1.09		12.49
SBA and USDA	622		2.49		2.42		622		2.72		2.63
Other	2,519		10.06		0.93		1,576		6.88		0.50
Total commercial loans	24,043		96.03		95.54		21,373		93.31		95.64
Real estate loans:
SBA and USDA	699		2.79		2.49		1,310		5.72		2.73
Total real estate loans	699		2.79		2.49		1,310		5.72		2.73
Construction:
SBA and USDA	61		0.24		0.44		43		0.19		0.30
Total construction loans	61		0.24		0.44		43		0.19		0.30
Credit cards	234		0.94		1.53		180		0.78		1.33
Total	$	25,037	100.00	%	100.00	%	$	22,906	100.00	%	100.00	%

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Analysis of Loan Loss Experience. The following table sets forth an analysis of the allowance for loan losses for the periods indicated:

	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
	(Dollars in thousands)
Allowance at beginning of period	$	24,739		$	19,094		$	22,906		$	18,379
Provision for loan losses	3,758			3,150			9,205			6,114
Charge-offs:
Commercial loans:
Technology	1,630			332			3,691			2,166
Life sciences	600			409			1,961			409
Asset-based loans	938			—			938			—
SBA and USDA	26			—			64			—
Other	246			—			246			128
Total commercial loans	3,440			741			6,900			2,703
Real estate loans:
SBA and USDA	27			—			567			390
Total real estate loans	27			—			567			390
Total charge offs	3,467			741			7,467			3,093
Recoveries:
Commercial loans:
Technology	(6		)	(53		)	(392		)	(156		)
SBA and USDA	(1		)	—			(1		)	—
Total commercial loans	(7		)	(53		)	(393		)	(156		)
Total recoveries	(7		)	(53		)	(393		)	(156		)
Net charge offs	3,460			688			7,074			2,937
Allowance at end of period	$	25,037		$	21,556		$	25,037		$	21,556
Allowance for loan losses to total loans at end of period	1.65		%	1.87		%	1.65		%	1.87		%
Net charge offs to average loans outstanding during period (annualized)	0.92		%	0.25		%	0.49		%	0.54		%

Market Risk

Market risk is defined as the risk of adverse fluctuations in the market value of financial assets and liabilities due to changes in market rates. Interest rate risk is our primary market risk and can result from timing and volume differences in the repricing of our rate-sensitive assets and liabilities, widening or tightening of credit spreads, changes in the general level of market interest rates and changes in the shape and level of market yield curves. Additionally, changes in interest rates can influence the rate of principal prepayments on mortgage securities, which affects the rate of amortization of purchase premiums and discounts, and ultimately the yield, of such securities. Other market risks include foreign currency exchange risk and equity price risk. These risks are not considered significant and no separate quantitative information concerning them is presented herein.

Interest Rate Risk Management. We manage the interest rate sensitivity of our interest-bearing liabilities and interest-earning assets in an effort to minimize the adverse effects of changes in the interest rate environment. Management of interest rate risk is carried out primarily through strategies involving our investment securities and available funding sources. In addition, our policies permit the use of on- and off-balance sheet derivative financial instruments to assist in managing interest rate risk, although to date we have not entered into any derivative financial instruments for such purposes.

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We have a Management Asset/Liability Committee to communicate, coordinate and control all aspects involving interest rate risk management. The Management Asset/Liability Committee, with oversight from the Board Asset/Liability Committee (“BALCO”), establishes and monitors the volume, maturities, pricing and mix of assets and funding sources with the objective of managing assets and funding sources to provide results that are consistent with liquidity, growth, risk limits and profitability goals. Adherence to relevant policies is monitored on an ongoing basis.

Net Interest Income Simulation and Economic Value of Equity Analysis. The matching of assets and liabilities may be analyzed by examining the extent to which such assets and liabilities are “interest sensitive.” An asset or liability is said to be interest rate sensitive within a specific time period if it will mature or reprice within that time period. We analyze our interest rate sensitivity position to manage the risk associated with interest rate movements through the use of two simulation models: net interest income (“NII”) simulation and economic value of equity ("EVE"). The EVE simulation provides a long term view of interest rate risk because it analyzes all of the Bank's future cash flows. EVE is defined as the present value of the Bank's assets less the present value of its liabilities, adjusted for any off balance sheet items. The results show a theoretical change in the value of our shareholders' equity as interest rates change.

The NII and EVE simulations are completed monthly and presented to the Asset/Liability Committee. The simulations provide an estimate of the impact of changes in interest rates on net interest income and equity under a range of assumptions. The numerous assumptions used in the simulation process are reviewed by the Asset/Liability Committee on a monthly basis. Changes to these assumptions can significantly affect the results of the simulations. The simulations incorporate assumptions regarding the potential timing in the repricing of certain assets and liabilities when market rates change and the changes in spreads between different market rates. The simulation analysis incorporates management’s current assessment of the risk that pricing margins will change adversely over time due to competition or other factors.

Simulation analysis is only an estimate of our interest rate risk exposure at a particular point in time. We continually review the potential effect changes in interest rates could have on the repayment of rate sensitive assets and funding requirements of rate sensitive liabilities.

The tables below set forth an approximation of our NII sensitivity exposure for the 12-month periods beginning June 30,2015 and December 31, 2014, and our EVE sensitivity at June 30,2015 and December 31, 2014. The simulations use projected repricing of assets and liabilities beginning June 30,2015 and December 31, 2014, on the basis of contractual maturities, anticipated repayments and scheduled rate adjustments. Prepayment rates can have a significant impact on interest income simulation. Because of the large percentage of variable rate loans and mortgage-backed securities we hold, rising or falling interest rates have a significant impact on the prepayment speeds of our earning assets that in turn affect the rate sensitivity position. Generally, when interest rates rise, prepayments tend to slow. When interest rates fall, mortgage prepayments tend to rise. Our asset sensitivity would be reduced if mortgage prepayments slow and vice versa. While we believe such assumptions to be reasonable, there can be no assurance that assumed prepayment rates will approximate actual future mortgage-backed security and loan repayment activity.

Numerous assumptions are used to model deposits since they do not have a contractual maturity and rates are internally set based on market conditions and management goals. Our assumption is that the rate paid on interest-bearing deposits is tied to the fed funds rate. We also use a pricing beta that represents the correlation between the fed funds rate and the actual rate modeled on interest-bearing deposits. We currently model interest-bearing deposits using a pricing beta of approximately 50% such that for an assumed 1.00% move in the fed funds rate there would be a 0.50% change in the modeled rate that we would pay on interest-bearing deposits. The deposit pricing beta was updated beginning with the first quarter of 2015 and was moved from 70% to 50% based on an updated review of our deposit assumptions. The change will have an impact on our reported interest rate sensitivity. In isolation, reducing the deposit pricing sensitivity from 70% to 50% will reduce the sensitivity of our interest bearing deposits to changes in interest rates. In addition, we also make assumptions as to how deposits will shift between interest-bearing products and non-interest bearing products in response to changes in rates. As rates increase we assume that an increasing percentage of deposits will shift from non-interest bearing to interest-bearing resulting in higher rates being paid on larger balances. The opposite would be true when rates are assumed to decrease.

Caution should be used when interpreting the results of the simulation models as presented in the following tables. There are limitations to our ability to fully model important assumptions such as the shape of the yield curve, actual prepayment speeds, the mix of interest bearing to non-interest bearing deposits and the basis risk between different rate indices. Also rates do not normally move instantaneously as our modeling results indicate. The results should not be interpreted as precise measures and do not represent the actual net interest income or market value of our equity for a given change in rates.

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	Estimated Increase/Decrease in Net Interest Income	Estimated Percentage Change in EVE
Basis Point (“bp”) Change in Interest Rates	12 Months Beginning
	June 30, 2015	At June 30, 2015
300	18.1%	(14.4)%
200	12.6	(8.5)
100	6.2	(3.0)
(100)	(3.9)	(0.6)
(200)	(6.0)	1.6

	Estimated Increase/Decrease in Net Interest Income	Estimated Percentage Change in EVE
Basis Point (“bp”) Change in Interest Rates	12 Months Beginning
	December 31, 2014	At December 31, 2014
300	9.7%	(12.8)%
200	8.6	(5.5)
100	5.3	(2.0)
(100)	(3.4)	(0.4)
(200)	(4.9)	2.4

Rates are immediately increased at the beginning of the projection. The results show that we are asset sensitive and that net interest income will increase as rates rise and will decrease as rates decline. Interest rates do not normally move instantaneously, but the analysis is useful to understanding the potential direction and magnitude of net interest income changes due to changing interest rates.

The EVE analysis shows that we would theoretically lose market value in a rising rate environment. This is primarily due to the fixed rate securities in our investment portfolio, which will lose value as rates rise. The analysis also assumes that amortizing assets will experience slower prepayments as rates increase, which will also cause asset values to decline. The opposite will be true for a declining rate environment where the EVE numbers will improve as the fixed rate securities will increase in value.

When compared to the December 31, 2014 results, the NII sensitivity increased in both the rising interest rate and the falling rate scenarios.

The EVE sensitivity showed a modest increase from December 31, 2014 to June 30,2015 for the rising rate scenarios and one of the two declining interest rate scenarios. The small increase in sensitivity across most scenarios was primarily caused by interest rate sensitivity in the investment portfolio whose balances will tend to decline in value as rates increase.

Liquidity Risk

Liquidity Management. Liquidity management is the ability to meet current and future financial obligations of a short-term nature. Our primary sources of funds consist of deposit inflows, loan repayments and sales, maturities and sales of securities. While maturities and scheduled amortization of loans and securities are predictable sources of funds, deposit flows, mortgage prepayments and loan and security sales are greatly influenced by general interest rates, economic conditions and competition.

We regularly adjust our investment in liquid assets based upon our assessment of (1) expected loan demand, (2) expected deposit flows, (3) yields available on interest-earning deposits and securities, and (4) the objectives of our asset/liability management, funds management and liquidity policies. The objective of the liquidity policy is to reduce the risk to our earnings and capital arising from the inability to meet obligations in a timely manner without incurring unacceptable losses. This entails ensuring sufficient funds are available at a reasonable cost to meet potential demands from both fund providers and borrowers. Liquid assets, defined as cash, due from banks, federal funds sold, repurchase agreements, and available-for-sale securities,

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were 49.4% of total assets at June 30, 2015. Excess liquid assets are generally invested in investment grade available-for-sale securities.

Our most liquid assets are cash and cash equivalents. The levels of these assets depend on our operating, financing, lending and investing activities during any given period. At June 30, 2015, cash and cash equivalents totaled $387.3 million. Securities classified as available-for-sale, which provide additional sources of liquidity, totaled $1.5 billion at June 30, 2015. In addition, at June 30, 2015, we had the ability to borrow $250.4 million from the FHLB. There were no outstanding borrowings under this line at June 30, 2015. Additionally, at June 30, 2015, we had the ability to access $83.4 million from the Federal Reserve Bank’s Discount Window on a collateralized basis. There were no outstanding borrowings under this line at June 30, 2015. We also maintain $60.0 million of unsecured lines of credit from four financial institutions to access federal funds. We had not accessed these unsecured lines of credit as of June 30, 2015. We believe that our liquid assets combined with the available credit lines provide adequate liquidity to meet our current financial obligations.

The following table presents our contractual obligations at June 30, 2015:

	Payments Due by Period
	Total		Less Than One Year		One to Three Years		Three to Five Years		More Than Five Years
	(In thousands)
Contractual Obligations
Deposits without stated maturity	$	3,554,380	$	3,554,380	$	—	$	—	$	—
Time deposits	9,384		8,381		1,003		—		—
Operating lease obligations	16,041		1,487		4,580		4,607		5,367
Total	$	3,579,805	$	3,564,248	$	5,583	$	4,607	$	5,367

Capital Management. Our management seeks to maintain adequate capital to support anticipated asset growth, operating needs and unexpected risks, and to ensure that Square 1 Financial and Square 1 Bank are in compliance with all current and anticipated regulatory capital guidelines. Our primary sources of new capital include retained earnings and proceeds from the sale and issuance of capital stock or other securities. Our management engages, in consultation with the BALCO, in an annual capital planning process in an effort to optimize the use of the capital available to us and to appropriately plan for our future capital needs. The capital plan, approved annually by the Board of Directors, considers capital needs for the foreseeable future and allocates capital to both existing and future business activities. Expected future use or activities for which capital may be set aside include balance sheet growth and associated relative increases in market or credit exposure, investment activity, potential product and business expansions, acquisitions and strategic or infrastructure investments.

Regulatory capital ratios for Square 1 Financial and the Bank exceeded minimum federal regulatory guidelines for a well-capitalized depository institution as of June 30, 2015 and December 31, 2014. See Note 11 to the interim consolidated financial statements for further information.

On January 1, 2015, the Basel III regulatory standard on bank capital adequacy became effective. The rule establishes a new Common Equity Tier 1 minimum capital requirement (4.5% of risk-weighted assets), increases the minimum Tier 1 capital to risk-based assets requirement (from 4.0% to 6.0% of risk-weighted assets), and requires institutions to hold 8.0% total capital and 4.0% Tier 1 capital to average consolidated assets (“Leverage Ratio”). It also increases the Tier 1 capital to risk-based assets threshold ratio for "well capitalized" from 6.0% to 8.0% or risk-weighted assets.

The rule also includes changes in what constitutes regulatory capital, some of which are subject to a two-year transition period. These changes include the phasing-out of certain instruments as qualifying capital. Under the new capital rule, Tier 1 capital consists of Common Equity Tier 1 capital and “Additional Tier 1 capital” instruments meeting certain revised requirements. In addition, Tier 2 capital is no longer limited to the amount of Tier 1 capital included in total capital. Mortgage servicing rights, certain deferred tax assets and investments in unconsolidated subsidiaries over designated percentages of common stock will be required to be deducted from capital, subject to a two-year transition period. Finally, Tier 1 capital generally will include accumulated other comprehensive income (which includes all unrealized gains and losses on available for sale debt and equity securities), subject to a two-year transition period, unless an opt-out election is made.

The new capital requirements also include changes in the risk-weights of assets to better reflect credit risk and other risk exposures. These include a 150% risk weight (up from 100%) for certain high volatility commercial real estate acquisition, development and construction loans and non-residential mortgage loans that are 90 days past due or otherwise on nonaccrual status; a 20% (up from 0%) credit conversion factor for the unused portion of a commitment with an original maturity of one

81

year or less that is not unconditionally cancellable; a 250% risk weight (up from 100%) for mortgage servicing rights and deferred tax assets that are not deducted from capital; and increased risk-weights (from 0% to up to 600%) for equity exposures. See “Supervision and Regulation-State Bank Regulation-New Capital Rule” under Item 1. Business of our 2014 Form 10-K for further information. Our and the Bank's Risk-Based Capital ratios decreased as a result of the changes to both qualifying regulatory capital and risk-weighted assets under the new rules.

Capital ratios for Square 1 Financial and Square 1 Bank, compared to the minimum regulatory ratios to be considered “well capitalized” and “adequately capitalized,” are set forth below.

	June 30, 2015		December 31, 2014		Minimum Ratio to be “Well Capitalized”		Minimum Ratio to be “Adequately Capitalized”
Square 1 Financial:
Total risk-based capital ratio	13.12	%	14.95	%	10.00	%	8.00	%
Tier 1 risk-based capital ratio	12.09		13.83		8.00		6.00
Common equity Tier 1 capital ratio	12.09		11.73		6.50		4.50
Tier 1 leverage ratio	9.07		9.71		5.00		4.00
Tangible equity to risk-weighted assets ratio	12.43		14.20		N/A		N/A
Square 1 Bank:
Total risk-based capital ratio	12.82	%	12.21	%	10.00	%	8.00	%
Tier 1 risk-based capital ratio	11.79		11.13		8.00		6.00
Common equity Tier 1 capital ratio	11.79		11.13		6.50		4.50
Tier 1 leverage ratio	8.82		8.16		5.00		4.00

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

See "Management's Discussion and Analysis of Financial Condition and Results of Operations - Risk Management" for discussion of quantitative and qualitative disclosures about market risk.

ITEM 4. CONTROLS AND PROCEDURES

As of the end of the period covered by this report, we carried out an evaluation, under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures. Based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the design and operation of these disclosure controls and procedures were effective, in all material respects, as of the end of the period covered by this report, in ensuring that information required to be disclosed in the reports that we file or submit under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and is accumulated and communicated to management, including the Chief Executive Officer and our Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure. There were no changes in our internal control over financial reporting identified in management's evaluation pursuant to Rules 13a-15(d) or 15d-15(d) of the Exchange Act during the last fiscal quarter that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II - OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

Three putative stockholder class action lawsuits were filed in connection with the previously disclosed proposed merger between us and PacWest (see Note 1). Manganaro v. Burke et al., Case No. 10817-VCL,  was filed in the Court of Chancery of the State of Delaware on March 20, 2015, and was voluntarily dismissed without prejudice on May 5, 2015. Lakowitz v. Bowers et al., Case No. 1:15-CV-371, was filed in the federal district court for the Middle District of North Carolina on May 6, 2015 and was voluntarily dismissed without prejudice on May 7, 2015. Li v. Bowers et al., Case No. 1:15-CV-373 (the “Li Action”), was filed in federal district court for the Middle District of North Carolina on May 7, 2015. On June 1, 2015, the parties to the Li Action entered into a Memorandum of Understanding which sets forth the parties’ agreement in principle to a settlement of that action, which remains subject to a number of conditions, including, among other things, final documentation and court approval following notice to the settlement class. There can be no assurance that the settlement will ultimately be approved by the court. See Note 1 "Organization and Basis of Presentation" and Note 16 "Off-balance Sheet Risk, Commitments and Contingencies" of the "Notes to Interim Consolidated Financial Statements (Unaudited)" under Part I, Item 1 of this Form 10-Q for discussions of the merger agreement and related legal proceedings.

We are also party to other legal actions that are routine and incidental to our business. In management’s opinion, the outcome of these matters, individually or in the aggregate, will not have a material effect on our results of operations or financial position. See Note 16 "Off-balance Sheet Risk, Commitments and Contingencies" of the "Notes to Interim Consolidated Financial Statements (Unaudited)" under Part I, Item 1 of this Form 10-Q.

ITEM 1A. RISK FACTORS

There have been no material changes in our assessment of our risk factors from those set forth in the 2014 Form 10-K.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

From April 1, 2015 through June 30, 2015, the Company issued an aggregate of 26,000 shares of its Class A common stock in connection with the exercise by investors of certain founder warrants to purchase the Company’s Class A common stock, at an exercise price of $10.00 per share. The shares of Class A common stock issued upon exercise of the warrants were issued pursuant to the exemption from registration contained in Section 4(a)(2) of the Securities Act, and the regulations promulgated thereunder, as a transaction by an issuer not involving any public offering.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 5. OTHER INFORMATION

None.

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ITEM 6. EXHIBITS

List of Exhibits

Exhibit	Description	Method of Filing
2.1	Agreement and Plan of Merger, dated March 1, 2015, by and between Square 1 Financial, Inc. and PacWest Bancorp	(incorporated by reference to Exhibit 2.1 in the Registrant’s Current Report on Form 8-K, filed with the SEC on March 5, 2015, File No. 001-36372)
3.1	Second Amended and Restated Certificate of Incorporation of Square 1 Financial, Inc.	(incorporated by reference to the Exhibit 3.1 in the Registrant’s Quarterly Report on Form 10-Q for the period ended June 30, 2014, File No. 001-36372)
3.2	Bylaws of Square 1 Financial, Inc.	(incorporated by reference to the Exhibit 3.2 in the Registrant’s Registration Statement on Form S-1, File No. 333-193197)
4.1	Specimen Stock Certificate for Class A Common Stock of Square 1 Financial, Inc.	(incorporated by reference to the Exhibit 4.1 in the Registrant’s Registration Statement on Form S-1, File No. 333-193197)
10.1	Square 1 Financial, Inc. 2009 Stock Incentive Plan, as amended	(incorporated by reference to the Exhibit 99.1 in the Registrant’s Registration Statement on Form S-8, File No. 333-195221)
10.2	Letter Agreement, dated March 1, 2015, by and between Square 1 Financial, Inc., Square 1 Bank and Patrick Oakes*+	(incorporated by reference from Exhibit 10.8 in the Registrant’s Annual Report on Form 10-K for the period ended December 31, 2014, filed with the SEC on March 20, 2015, File No. 001-36372)
10.3	Letter Agreement, dated March 1, 2015, by and between Square 1 Financial, Inc., Square 1 Bank and Gregory Thompson*+	(incorporated by reference from Exhibit 10.10 in the Registrant’s Annual Report on Form 10-K for the period ended December 31, 2014, filed with the SEC on March 20, 2015, File No. 001-36372)
10.4	Employment Agreement, dated March 1, 2015, by and between Square 1 Financial, Inc., Square 1 Bank and Jason Kranack*+	(incorporated by reference from Exhibit 10.11 in the Registrant’s Annual Report on Form 10-K for the period ended December 31, 2014, filed with the SEC on March 20, 2015, File No. 001-36372)
10.5	Employment Agreement, dated March 1, 2015, by and between Square 1 Financial, Inc., Square 1 Bank and Frank Tower*+	(incorporated by reference from Exhibit 10.12 in the Registrant’s Annual Report on Form 10-K for the period ended December 31, 2014, filed with the SEC on March 20, 2015, File No. 001-36372)
31.1	Certification of the Chief Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	Filed herewith
31.2	Certification of the Chief Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.	Filed herewith
32.1	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	Filed herewith

85

32.2	Certification Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.	Filed herewith
101.INS	XBRL Instance Document	Filed herewith
101.SCH	XBRL Taxonomy Extension Schema Document	Filed herewith
101.CAL	XBRL Taxonomy Calculation Linkbase Document	Filed herewith
101.DEF	XBRL Taxonomy Definition Linkbase Document	Filed herewith
101.LAB	XBRL Taxonomy Label Linkbase Document	Filed herewith
101.PRE	XBRL Taxonomy Presentation Linkbase Document	Filed herewith

86

SIGNATURES

Pursuant to the requirements of the Securities Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Durham, State of North Carolina on August 12, 2015.

Square 1 Financial, Inc.
By:	/s/ Douglas H. Bowers
	Douglas H. Bowers President and Chief Executive Officer
	/s/ Patrick Oakes
	Patrick Oakes Executive Vice President and Chief Financial Officer (principal financial and accounting officer)

87

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, Douglas H. Bowers, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Square 1 Financial, Inc.;

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 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 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 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.

Date:	August 12, 2015	/s/ Douglas H. Bowers
		Douglas H. Bowers
		President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

SECTION 302 OF THE

SARBANES-OXLEY ACT OF 2002

I, Patrick Oakes, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Square 1 Financial, Inc.;

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 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 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 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.

Date:	August 12, 2015	/s/ Patrick Oakes
		Patrick Oakes
		Executive Vice President and Chief Financial Officer (principal financial and accounting officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. 1350, the undersigned officer of Square 1 Financial, Inc. (the “Company”) hereby certifies that the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 12, 2015	/s/ Douglas H. Bowers
		Douglas H. Bowers
		President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

SECTION 906 OF THE

SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. 1350, the undersigned officer of Square 1 Financial, Inc. (the “Company”) hereby certifies that the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2015 (the “Report”) fully complies with the requirements of Section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 and that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	August 12, 2015	/s/ Patrick Oakes
		Patrick Oakes
		Executive Vice President and Chief Financial Officer (principal financial and accounting officer)

XML

Fair Value of Financial Assets and Liabilities (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block]

The following tables present quantitative information about Level 3 fair value measurements:

(dollars in thousands)	June 30, 2015
	Fair Value		Valuation Technique	Unobservable Input	Weighted Average Range
Available for sale securities:
Corporates	$	3,011	Sensitivity analyses	Indicative pricing	(1)
Non-agency MBS	185,113		Volatility-driven, multi-dimensional spread tables, optional adjusted spread model and prepayment model	Indicative pricing	(1)
				Collateral performance	(1)
Other ABS	106,974		Multi-dimensional, collateral specific spread tables	Indicative pricing	(1)
				Collateral performance	(1)
Warrants	5,125		Modified Black-Scholes option pricing model	Volatility	19.5% - 127.2% (2)
				Risk-free interest rate	0.6% - 1.2% (2)
				Remaining life assumption	21.8% - 50.8% (2)
Servicing asset	1,450		Discounted cash flow	Discount rates	(1)
				Default rates	(1)
				Prepayment rates	(1)
				Servicing costs	(1)
Venture capital fund investments	4,232		Private company equity pricing	Actual and forecasted results, cash position, market comparable companies	(3)

(dollars in thousands)	December 31, 2014
	Fair Value		Valuation Technique	Unobservable Input	Weighted Average Range
Available for sale securities:
Non-agency MBS	$	173,099	Volatility-driven, multi-dimensional spread tables, optional adjusted spread model and prepayment model	Indicative pricing	(1)
				Collateral performance	(1)
Other ABS	47,621		Multi-dimensional, collateral specific spread tables	Indicative pricing	(1)
				Collateral performance	(1)
Warrants	4,304		Modified Black-Scholes option pricing model	Volatility	20.2% - 67.0% (2)
				Risk-free interest rate	1.2 % - 1.5% (2)
				Remaining life assumption	54.0% - 89.4% (2)
Servicing asset	1,222		Discounted cash flow	Discount rates	(1)
				Default rates	(1)
				Prepayment rates	(1)
				Servicing costs	(1)
Venture capital fund investments	3,704		Private company equity pricing	Actual and forecasted results, cash position, market comparable companies	(3)

(1) The Company uses third-party pricing information without adjustment for this Level 3 fair value measurement.

(2) Low end of range relates to private equity warrant assets portfolio and high end of range relates to public equity warrant assets portfolio.

(3) The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

Following are tables that present information about the Company's investment securities, warrants, servicing asset, and venture capital fund investments, measured at fair value on a recurring basis:

(in thousands)	At June 30, 2015
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
Available for sale securities:
U.S. treasuries	$	159,501	$	—	$	—	$	159,501
Agency direct obligations	30,435		—		—		30,435
SBA pools	—		164,574		—		164,574
Agency MBS	—		674,285		—		674,285
Municipal bonds	—		98,931		—		98,931
Corporates	—		117,614		3,011		120,625
Non-agency MBS	—		—		185,113		185,113
Other ABS	—		—		106,974		106,974
Equity securities	904		—		—		904
Total available for sale securities	$	190,840	$	1,055,404	$	295,098	$	1,541,342
Warrants	$	—	$	—	$	5,125	$	5,125
Servicing asset	$	—	$	—	$	1,450	$	1,450
Venture capital fund investments	$	—	$	—	$	4,232	$	4,232

(in thousands)	At December 31, 2014
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
Available for sale securities:
U.S. treasuries	$	29,641	$	—	$	—	$	29,641
Agency direct obligations	30,631		—		—		30,631
SBA pools	—		179,822		—		179,822
Agency MBS	—		614,922		—		614,922
Municipal bonds	—		98,490		—		98,490
Corporates	—		118,359		—		118,359
Non-agency MBS	—		—		173,099		173,099
Other ABS	—		—		47,621		47,621
Equity securities	1,948		—		—		1,948
Total available for sale securities	$	62,220	$	1,011,593	$	220,720	$	1,294,533
Warrants	$	—	$	—	$	4,304	$	4,304
Servicing asset	$	—	$	—	$	1,222	$	1,222
Venture capital fund investments	$	—	$	—	$	3,704	$	3,704

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

The following tables present additional information about Level 3 securities, venture capital fund investments, servicing assets and warrants, measured at fair value on a recurring basis:

(dollars in thousands)	Three Months Ended June 30, 2015
	Available for sale securities
	Corporates		Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at March 31, 2015	$	—	$	164,749		$	67,043		$	3,834		$	1,393		$	4,649		$	241,668
Transfers into Level 3	3,011		—			—			—			—			—			3,011
Transfers out of Level 3	—		—			—			—			—			(29		)	(29		)
Total gains (losses):
included in net income	—		—			—			337			(14		)	239			562
included in other comprehensive income	—		(12,688		)	(4,785		)	—			—			—			(17,473		)
Purchases, sales, issuances and settlements:
Purchases	—		47,787			46,009			231			—			—			94,027
Sales	—		(14,735		)	(1,293		)	—			—			(137		)	(16,165		)
Issuances	—		—			—			—			147			403			550
Settlements	—		—			—			(170		)	(76		)	—			(246		)
Balance at June 30, 2015	$	3,011	$	185,113		$	106,974		$	4,232		$	1,450		$	5,125		$	305,905

(dollars in thousands)	Three Months Ended June 30, 2014
	Available for sale securities
	Corporates			Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at March 31, 2014	$	29,391		$	66,651		$	24,605		$	3,958		$	1,298		$	6,596		$	132,499
Transfers into Level 3	—			—			—			—			—			—			—
Transfers out of Level 3	(23,389		)	—			—			(953		)	—			(1,369		)	(25,711		)
Total gains (losses):
included in net income	—			—			—			1,415			6			21			1,442
included in other comprehensive income	83			(2,773		)	(6,810		)	—			—			—			(9,500		)
Purchases, sales, issuances and settlements:
Purchases	—			23,759			16,252			170			—			—			40,181
Sales	—			(2,203		)	—			—			—			(994		)	(3,197		)
Issuances	—			—			—			—			55			493			548
Settlements	—			—			—			(257		)	(34		)	—			(291		)
Balance at June 30, 2014	$	6,085		$	85,434		$	34,047		$	4,333		$	1,325		$	4,747		$	135,971

(dollars in thousands)	Six Months Ended June 30, 2015
	Available for sale securities
	Corporates		Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at December 31, 2014	$	—	$	173,099		$	47,621		$	3,704		$	1,222		$	4,304		$	229,950
Transfers into Level 3	3,011		—			—			—			—			—			3,011
Transfers out of Level 3	—		—			—			—			—			(38		)	(38		)
Total gains (losses):
included in net income	—		—			—			337			(9		)	701			1,029
included in other comprehensive income	—		(22,929		)	(8,252		)	—			—			—			(31,181		)
Purchases, sales, issuances and settlements:
Purchases	—		60,677			68,898			474			—			—			130,049
Sales	—		(25,734		)	(1,293		)	—			—			(942		)	(27,969		)
Issuances	—		—			—			—			331			1,100			1,431
Settlements			—			—			(283		)	(94		)	—			(377		)
Balance at June 30, 2015	$	3,011	$	185,113		$	106,974		$	4,232		$	1,450		$	5,125		$	305,905

(dollars in thousands)	Six Months Ended June 30, 2014
	Available for sale securities
	Corporates			Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at December 31, 2013	$	26,301		$	52,170		$	22,091		$	4,066		$	1,265		$	5,105		$	110,998
Transfers into Level 3	2,994			—			2,762			—			—			—			5,756
Transfers out of Level 3	(23,389		)	—			—			(953		)	—			(1,369		)	(25,711		)
Total gains (losses):
included in net income	—			—			—			1,415			18			2,216			3,649
included in other comprehensive income	179			(4,405		)	(7,058		)	—			—			—			(11,284		)
Purchases, sales, issuances and settlements:
Purchases	—			39,872			16,252			170			—			—			56,294
Sales	—			(2,203		)	—			—			—			(1,800		)	(4,003		)
Issuances	—			—			—			—			110			595			705
Settlements	—			—			—			(365		)	(68		)	—			(433		)
Balance at June 30, 2014	$	6,085		$	85,434		$	34,047		$	4,333		$	1,325		$	4,747		$	135,971

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]

The following tables summarize the estimated fair values and remaining unfunded commitments for these investments:

(in thousands)	June 30, 2015
	Carrying Value		Fair Value		Unfunded Commitments
Venture capital fund investments	$	4,232	$	4,232	$	1,634
Total	$	4,232	$	4,232	$	1,634

(in thousands)	December 31, 2014
	Carrying Value		Fair Value		Unfunded Commitments
Venture capital fund investments	$	3,704	$	3,704	$	2,076
Total	$	3,704	$	3,704	$	2,076

Fair Value Measurements, Nonrecurring [Table Text Block]

The following table presents information about the Company's assets measured at fair value on a non-recurring basis:

(in thousands)	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
June 30, 2015
Impaired loans	$	—	$	—	$	9,754	$	9,754
December 31, 2014
Impaired loans	$	—	$	—	$	9,135	$	9,135

Financial Instruments Not Carried at Fair Value [Table Text Block]

The following tables present the estimated fair values of the Company's financial instruments that are not carried at fair value:

(in thousands)	June 30, 2015
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Estimated Fair Value Ending Balance
Financial assets:
Cash and cash equivalents	$	387,347	$	387,347	$	—	$	—	$	387,347
Investment in time deposits	1,002		1,002		—		—		1,002
Investment securities—held to maturity	392,872		—		386,395		6,420		392,815
Loans, net of unearned income	1,516,032		—		—		1,512,363		1,512,363
FHLB stock	2,787		—		—		2,787		2,787
Accrued interest receivable	13,110		—		13,110		—		13,110
Financial liabilities:
Non-maturity deposits(1)	3,554,380		3,554,380		—		—		3,554,380
Time deposits	9,384		—		9,369		—		9,369
Off-balance sheet financial assets:
Future financing commitments	—		—		—		1,431,391		1,431,391

(1)Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

(in thousands)	December 31, 2014
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Estimated Fair Value Ending Balance
Financial assets:
Cash and cash equivalents	$	85,942	$	85,942	$	—	$	—	$	85,942
Investment in time deposits	1,251		1,251		—		—		1,251
Investment securities—held to maturity	300,425		—		299,986		6,420		306,406
Loans, net of unearned income	1,346,449		—		—		1,336,470		1,336,470
FHLB stock	2,091		—		—		2,091		2,091
Accrued interest receivable	11,878		—		11,878		—		11,878
Financial liabilities:
Non-maturity deposits(1)	2,760,232		2,760,232		—		—		2,760,232
Time deposits	16,320		—		16,268		—		16,268
Off-balance sheet financial assets:
Future financing commitments	—		—		—		1,232,078		1,232,078

(1)Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

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Loans and Allowance for Loan Losses Narrative (Details) - SBA and USDA [Member] $ in Millions	6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014	Dec. 31, 2014 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding customer balance on SBA and USDA loans sold	$ 142.5		$ 135.3
Number of SBA/USDA guaranteed portion loans sold	5	7
Outstanding sold balance of loans	$ 57.5		$ 57.2

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Loans and Allowance for Loan Losses Schedule of Loan Losses Individually and Collectively Evaluated for Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	$ 8,183	$ 8,104
Ending Balance: Collectively Evaluated for Impairment	16,854	14,802
Commercial loans [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	8,165	7,594
Ending Balance: Collectively Evaluated for Impairment	15,878	13,779
Commercial loans [Member] | Technology [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	5,385	4,523
Ending Balance: Collectively Evaluated for Impairment	9,074	7,381
Commercial loans [Member] | Life sciences [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	313	1,181
Ending Balance: Collectively Evaluated for Impairment	3,595	2,476
Commercial loans [Member] | Asset based loans [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	0	280
Ending Balance: Collectively Evaluated for Impairment	2,161	3,084
Commercial loans [Member] | Venture capital/private equity [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	0	0
Ending Balance: Collectively Evaluated for Impairment	374	250
Commercial loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	0	46
Ending Balance: Collectively Evaluated for Impairment	622	576
Commercial loans [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	2,467	1,564
Ending Balance: Collectively Evaluated for Impairment	52	12
Real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	18	510
Ending Balance: Collectively Evaluated for Impairment	681	800
Real estate loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	18	510
Ending Balance: Collectively Evaluated for Impairment	681	800
Construction loans [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	0	0
Ending Balance: Collectively Evaluated for Impairment	61	43
Construction loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	0	0
Ending Balance: Collectively Evaluated for Impairment	61	43
Credit cards [Member]
Financing Receivable, Impaired [Line Items]
Ending Balance: Individually Evaluated for Impairment	0	0
Ending Balance: Collectively Evaluated for Impairment	$ 234	$ 180

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Derivatives Gains and Losses on Equity Warrants (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Warrant income		$ 239	$ 21	$ 701	$ 2,216
Warrant [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains on exercise of equity warrant assets		160	2,160	899	3,018
Derivative Instruments Not Designated as Hedging Instruments, Realized Losses	[1]	(4)	(2)	(4)	(2)
Net gains on exercise of equity warrant assets		156	2,158	895	3,016
Non-monetized write off of warrant assets		(66)	(97)	(125)	(176)
Net realized gains on equity warrant assets		90	2,061	770	2,840
Change in fair value of equity warrant assets		149	(2,040)	(69)	(624)
Warrant income		$ 239	$ 21	$ 701	$ 2,216
Number of companies in which warrant gains were realized		13	20	29	33
Warrant [Member] | Early stage [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains on exercise of equity warrant assets		$ 60	$ 889	$ 206	$ 1,030
Number of companies in which warrant gains were realized		4	6	9	11
Warrant [Member] | Expansion stage [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains on exercise of equity warrant assets		$ 90	$ 1,144	$ 197	$ 1,534
Derivative Instruments Not Designated as Hedging Instruments, Realized Losses		$ 0	$ (2)	$ 0	$ (2)
Number of companies in which warrant gains were realized		8	12	14	17
Number of companies in which warrant losses were realized			1		1
Warrant [Member] | Late stage [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Gains on exercise of equity warrant assets		$ 10	$ 127	$ 496	$ 454
Derivative Instruments Not Designated as Hedging Instruments, Realized Losses		$ (4)	$ 0	$ (4)	$ 0
Number of companies in which warrant gains were realized		1	2	6	5
Number of companies in which warrant losses were realized		1		1
Public Company [Member] | Warrant [Member]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net [Abstract]
Net gains on exercise of equity warrant assets			$ 800		$ 800
Number of companies in which warrant gains were realized		0	4	1	4

[1] (1) Realized warrant losses for the three and six months ended June 30, 2015 related to one late stage company. Realized warrant losses for the three and six months ended June 30, 2014 related to one expansion stage company.

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Intangible Assets Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 800	$ 800
Accumulated amortization	(505)	(407)
Total intangible assets subject to amortization, net	295	393
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	210	210
Accumulated amortization	(210)	(210)
Existing customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	590	590
Accumulated amortization	$ (295)	$ (197)

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Loans and Allowance for Loan Losses Schedule of Composition of Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Commercial loans:
Commercial loans, gross	$ 1,456,716	$ 1,295,343
Real estate loans:
Real estate loans, gross	37,995	36,978
Construction loans:
Construction loans, gross	6,752	4,035
Credit cards	23,379	17,980
Less unearned income, net	(8,810)	(7,887)
Loans, net of unearned income	1,516,032	1,346,449
Technology [Member] | Commercial loans [Member]
Commercial loans:
Commercial loans, gross	739,016	631,979
Life sciences [Member] | Commercial loans [Member]
Commercial loans:
Commercial loans, gross	307,240	274,057
Asset based loans [Member] | Commercial loans [Member]
Commercial loans:
Commercial loans, gross	143,204	177,701
Venture capital/private equity [Member] | Commercial loans [Member]
Commercial loans:
Commercial loans, gross	216,268	169,143
SBA and USDA [Member] | Commercial loans [Member]
Commercial loans:
Commercial loans, gross	36,926	35,609
SBA and USDA [Member] | Real estate loans [Member]
Real estate loans:
Real estate loans, gross	37,995	36,978
SBA and USDA [Member] | Construction loans [Member]
Construction loans:
Construction loans, gross	6,752	4,035
Other [Member] | Commercial loans [Member]
Commercial loans:
Commercial loans, gross	$ 14,062	$ 6,854

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Loans and Allowance for Loan Losses (Tables)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

The composition of loans, net of unearned income, broken out by portfolio segment at June 30, 2015 and December 31, 2014, are as follows:

(in thousands)	June 30, 2015			December 31, 2014
Commercial loans:
Technology	$	739,016		$	631,979
Life sciences	307,240			274,057
Asset-based loans	143,204			177,701
Venture capital/private equity	216,268			169,143
SBA and USDA	36,926			35,609
Other	14,062			6,854
Total commercial loans	1,456,716			1,295,343
Real estate loans:
SBA and USDA	37,995			36,978
Total real estate loans	37,995			36,978
Construction loans:
SBA and USDA	6,752			4,035
Total construction loans	6,752			4,035
Credit cards	23,379			17,980
Less unearned income, net	(8,810		)	(7,887		)
Total loans, net of unearned income	$	1,516,032		$	1,346,449

Summary of Activity in the Allowance for Loan Losses [Table Text Block]

The following tables summarize the activity in the allowance for loan losses during the three and six months ended June 30,2015 and 2014, broken out by portfolio segment:

(in thousands)	Three Months Ended June 30, 2015
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	12,714	$	1,630	$	6	$	3,369		$	14,459
Life sciences	4,581		600		—		(73		)	3,908
Asset-based loans	3,025		938		—		74			2,161
Venture capital/private equity	331		—		—		43			374
SBA and USDA	534		26		1		113			622
Other	2,474		246		—		291			2,519
Total commercial loans	23,659		3,440		7		3,817			24,043
Real estate loans:
SBA and USDA	826		27		—		(100		)	699
Total real estate loans	826		27		—		(100		)	699
Construction:
SBA and USDA	49		—		—		12			61
Total construction loans	49		—		—		12			61
Credit cards	205		—		—		29			234
Total loans	$	24,739	$	3,467	$	7	$	3,758		$	25,037

(in thousands)	Three Months Ended June 30, 2014
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	13,233	$	332	$	53	$	426		$	13,380
Life sciences	3,403		409		—		2,180			5,174
Asset-based loans	877		—		—		486			1,363
Venture capital/private equity	106		—		—		37			143
SBA and USDA	557		—		—		57			614
Other	9		—		—		2			11
Total commercial loans	18,185		741		53		3,188			20,685
Real estate loans:
SBA and USDA	703		—		—		(1		)	702
Total real estate loans	703		—		—		(1		)	702
Construction:
SBA and USDA	57		—		—		(38		)	19
Total construction loans	57		—		—		(38		)	19
Credit cards	149		—		—		1			150
Total loans	$	19,094	$	741	$	53	$	3,150		$	21,556

(in thousands)	Six Months Ended June 30, 2015
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	11,904	$	3,691	$	392	$	5,854		$	14,459
Life sciences	3,657		1,961		—		2,212			3,908
Asset based loans	3,364		938		—		(265		)	2,161
Venture capital/private equity	250		—		—		124			374
SBA and USDA	622		64		1		63			622
Other	1,576		246		—		1,189			2,519
Total commercial loans	21,373		6,900		393		9,177			24,043
Real estate loans:
SBA and USDA	1,310		567		—		(44		)	699
Total real estate loans	1,310		567		—		(44		)	699
Construction:
SBA and USDA	43		—		—		18			61
Total construction loans	43		—		—		18			61
Credit cards	180		—		—		54			234
Total loans	$	22,906	$	7,467	$	393	$	9,205		$	25,037

(in thousands)	Six Months Ended June 30, 2014
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	13,609	$	2,166	$	156	1,781			$	13,380
Life sciences	1,971		409		—		3,612			5,174
Asset based loans	684		—		—		679			1,363
Venture capital/private equity	197		—		—		(54		)	143
SBA and USDA	627		128		—		115			614
Other	2		—		—		9			11
Total commercial loans	17,090		2,703		156		6,142			20,685
Real estate loans:
SBA and USDA	1,163		390		—		(71		)	702
Total real estate loans	1,163		390		—		(71		)	702
Construction:
SBA and USDA	10		—		—		9			19
Total construction loans	10		—		—		9			19
Credit cards	116		—		—		34			150
Total loans	$	18,379	$	3,093	$	156	$	6,114		$	21,556

Allowance for Loan Losses Individually and Collectively Evaluated for Impairment [Table Text Block]

The following tables summarize the allowance for loan losses individually and collectively evaluated for impairment at June 30, 2015 and December 31, 2014, broken out by portfolio segment:

(in thousands)	June 30, 2015
	Ending Balance: Individually Evaluated for Impairment		Ending Balance: Collectively Evaluated for Impairment
Commercial loans
Technology	$	5,385	$	9,074
Life sciences	313		3,595
Asset based loans	—		2,161
Venture capital/private equity	—		374
SBA and USDA	—		622
Other	2,467		52
Total commercial loans	8,165		15,878
Real estate loans:
SBA and USDA	18		681
Total real estate loans	18		681
Construction:
SBA and USDA	—		61
Total construction loans	—		61
Credit cards	—		234
Total loans	$	8,183	$	16,854

(in thousands)	December 31, 2014
	Ending Balance: Individually Evaluated for Impairment		Ending Balance: Collectively Evaluated for Impairment
Commercial loans
Technology	$	4,523	$	7,381
Life sciences	1,181		2,476
Asset based loans	280		3,084
Venture capital/private equity	—		250
SBA and USDA	46		576
Other	1,564		12
Total commercial loans	7,594		13,779
Real estate loans:
SBA and USDA	510		800
Total real estate loans	510		800
Construction:
SBA and USDA	—		43
Total construction loans	—		43
Credit cards	—		180
Total loans	$	8,104	$	14,802

Past Due Financing Receivables [Table Text Block]

The following table summarizes the aging of gross loans, broken out by portfolio segment, at June 30, 2015 and December 31, 2014. See Note 2 to the Consolidated Financial Statements in the Company's 2014 Form 10-K for a discussion of credit quality indicators.

(in thousands)	June 30, 2015
	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Loans Past Due		Current		Total Loans		Loans 90+ Days Past Due Still Accruing
Commercial loans:
Technology	$	2,381	$	2,289	$	1,200	$	5,870	$	733,146	$	739,016	$	—
Life sciences	—		—		—		—		307,240		307,240		—
Asset-based loans	—		—		—		—		143,204		143,204		—
Venture capital/private equity	—		—		—		—		216,268		216,268		—
SBA and USDA	—		—		539		539		36,387		36,926		—
Other	—		—		—		—		14,062		14,062		—
Total commercial loans	2,381		2,289		1,739		6,409		1,450,307		1,456,716		—
Real estate loans:
SBA and USDA	—		385		1,754		2,139		35,856		37,995		—
Total real estate loans	—		385		1,754		2,139		35,856		37,995		—
Construction loans:
SBA and USDA	—		—		—		—		6,752		6,752		—
Total construction loans	—		—		—		—		6,752		6,752		—
Credit cards	—		—		—		—		23,379		23,379		—
Total loans, gross	$	2,381	$	2,674	$	3,493	$	8,548	$	1,516,294	$	1,524,842	$	—

(in thousands)	December 31, 2014
	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Loans Past Due		Current		Total Loans		Loans 90+ Days Past Due Still Accruing
Commercial loans:
Technology	$	—	$	—	$	—	$	—	$	631,979	$	631,979	$	—
Life sciences	—		—		—		—		274,057		274,057		—
Asset-based loans	—		—		—		—		177,701		177,701		—
Venture capital/private equity	—		—		—		—		169,143		169,143		—
SBA and USDA	—		—		175		175		35,434		35,609		—
Other	3,245		—		—		3,245		3,609		6,854		—
Total commercial loans	3,245		—		175		3,420		1,291,923		1,295,343		—
Real estate loans:
SBA and USDA	—		—		408		408		36,570		36,978		—
Total real estate loans	—		—		408		408		36,570		36,978		—
Construction loans:
SBA and USDA	—		—		—		—		4,035		4,035		—
Total construction loans	—		—		—		—		4,035		4,035		—
Credit cards	—		—		—		—		17,980		17,980		—
Total loans, gross	$	3,245	$	—	$	583	$	3,828	$	1,350,508	$	1,354,336	$	—

Impaired Financing Receivables [Table Text Block]

The following tables summarize impaired loans as they relate to allowance for loan losses, broken out by portfolio segment, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Allowance for loan losses related to impaired loans		Impaired loans with related allowance for loan losses		Impaired loans with no related allowance for loan losses		Recorded investment in impaired loans		Total of unpaid principal of impaired loans
Commercial loans:
Technology	$	5,385	$	8,792	$	1,200	$	9,992	$	10,507
Life Sciences	313		1,911		—		1,911		1,976
SBA and USDA	—		—		539		539		611
Other	2,467		3,343		—		3,343		3,409
Total commercial loans	8,165		14,046		1,739		15,785		16,503
Real estate loans:
SBA and USDA	18		385		1,767		2,152		2,745
Total real estate loans	18		385		1,767		2,152		2,745
Total loans, gross	$	8,183	$	14,431	$	3,506	$	17,937	$	19,248

(in thousands)	December 31, 2014
	Allowance for loan losses related to impaired loans		Impaired loans with related allowance for loan losses		Impaired loans with no related allowance for loan losses		Recorded investment in impaired loans		Total of unpaid principal of impaired loans
Commercial loans:
Technology	$	4,523	$	8,757	$	730	$	9,487	$	10,398
Life Sciences	1,181		2,511		—		2,511		4,140
Asset-based loans	280		570		—		570		570
SBA and USDA	46		175		—		175		183
Other	1,564		3,245		—		3,245		3,261
Total commercial loans	7,594		15,258		730		15,988		18,552
Real estate loans:
SBA and USDA	510		1,251		—		1,251		1,261
Total real estate loans	510		1,251		—		1,251		1,261
Total loans, gross	$	8,104	$	16,509	$	730	$	17,239	$	19,813

Average Impaired Loans By Segment And Class [Table Text Block]

The following table summarizes average impaired loans, broken out by portfolio segment, during the three and six months ended June 30,2015 and 2014:

(in thousands)	Three Months Ended June 30,
	2015				2014
	Average recorded investment in impaired loans		Interest income recognized		Average recorded investment in impaired loans		Interest income recognized
Commercial loans:
Technology	$	13,620	$	—	$	8,159	$	—
Life sciences	2,311		—		2,214		—
Asset-based loans	334		—		—		—
SBA and USDA	550		—		624		—
Other	3,337		—		—		—
Total commercial loans	20,152		—		10,997		—
Real estate loans:
SBA and USDA	2,872		—		1,283		—
Total real estate loans	2,872		—		1,283		—
Credit cards	—		—		—		—
Total loans, gross	$	23,024	$	—	$	12,280	$	—

(in thousands)	Six Months Ended June 30,
	2015				2014
	Average recorded investment in impaired loans		Interest income recognized		Average recorded investment in impaired loans		Interest income recognized
Commercial loans:
Technology	$	9,008	$	—	$	7,572	$	—
Life sciences	1,746		—		1,375		—
Asset-based loans	312		—		—		—
SBA and USDA	301		—		717		—
Other	2,882		—		—		—
Total commercial loans	14,249		—		9,664		—
Real estate loans:
SBA and USDA	1,465		—		1,283		—
Total real estate loans	1,465		—		1,283		—
Credit cards	—		—		10		—
Total loans, gross	$	15,714	$	—	$	10,957	$	—

Financing Receivable Credit Quality Indicators [Table Text Block]

The following table summarizes the credit quality indicators, broken out by portfolio segment, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Pass		Performing (Criticized)		Impaired		Total
Commercial loans:
Technology	$	693,726	$	35,298	$	9,992	$	739,016
Life sciences	293,746		11,583		1,911		307,240
Asset-based loans	128,946		14,258		—		143,204
Venture capital/private equity	216,268		—		—		216,268
SBA and USDA	32,175		4,212		539		36,926
Other	10,719		—		3,343		14,062
Total commercial loans	1,375,580		65,351		15,785		1,456,716
Real estate loans:
SBA and USDA	35,843		—		2,152		37,995
Total real estate loans	35,843		—		2,152		37,995
Construction loans:
SBA and USDA	6,752		—		—		6,752
Total construction loans	6,752		—		—		6,752
Credit cards	23,379		—		—		23,379
Total loans, gross	$	1,441,554	$	65,351	$	17,937	$	1,524,842

(in thousands)	December 31, 2014
	Pass		Performing (Criticized)		Impaired		Total
Commercial loans:
Technology	$	575,483	$	47,009	$	9,487	$	631,979
Life sciences	257,143		14,403		2,511		274,057
Asset-based loans	160,558		16,573		570		177,701
Venture capital/private equity	169,143		—		—		169,143
SBA and USDA	35,040		394		175		35,609
Other	3,609		—		3,245		6,854
Total commercial loans	1,200,976		78,379		15,988		1,295,343
Real estate loans:
SBA and USDA	29,613		6,114		1,251		36,978
Total real estate loans	29,613		6,114		1,251		36,978
Construction loans:
SBA and USDA	4,035		—		—		4,035
Total construction loans	4,035		—		—		4,035
Credit cards	17,980		—		—		17,980
Total loans, gross	$	1,252,604	$	84,493	$	17,239	$	1,354,336

Troubled Debt Restructurings on Financing Receivables [Table Text Block]

The following table summarizes the Company's loans classified as TDRs, broken out by portfolio segment, during the three and six months ended June 30,2015:

(dollars in thousands)	Three Months Ended June 30, 2015
	Modifications					TDRs That Subsequently Defaulted
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts	Recorded Investment
Commercial loans:
Technology	—	$	—	$	—	—	$	—
Life Sciences	—	—		—		1	600
Other	1	3,343		3,343		—	—
Total commercial loans	1	3,343		3,343		1	600
Total loans, gross	1	$	3,343	$	3,343	1	$	600

(dollars in thousands)	Six Months Ended June 30, 2015
	Modifications					TDRs That Subsequently Defaulted
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts	Recorded Investment
Commercial loans:
Technology	—	$	—	$	—	1	$	366
Life Sciences	—	—		—		1	600
Other	1	3,343		3,343		—	—
Total commercial loans	1	3,343		3,343		2	966
Total loans, gross	1	3,343		3,343		2	966

The loan identified as a TDR during the three and six months ended June 30,2015, was restructured to defer interest payments. The loan is considered a nonperforming loan and, as such, was individually considered for allowance for loan losses calculations. There were no modifications of TDRs during the three and six months ended June 30,2014.

The Bank currently has no commitments to lend to borrowers with loans identified as TDRs.

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Fair Value of Financial Assets and Liabilities Fair Value of Financial Assets Measured on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands		Jun. 30, 2015		Dec. 31, 2014
Recurring [Member]
Available for sale securities:
Available for sale securities		$ 1,541,342		$ 1,294,533
Warrants		5,125		4,304
Servicing asset		1,450		1,222
Venture capital fund investments		4,232		3,704
Recurring [Member] | US Treasury Securities [Member]
Available for sale securities:
Available for sale securities		159,501		29,641
Recurring [Member] | Agency direct obligations [Member]
Available for sale securities:
Available for sale securities		30,435		30,631
Recurring [Member] | SBA pools [Member]
Available for sale securities:
Available for sale securities		164,574		179,822
Recurring [Member] | Agency MBS [Member]
Available for sale securities:
Available for sale securities		674,285		614,922
Recurring [Member] | Municipal bonds [Member]
Available for sale securities:
Available for sale securities		98,931		98,490
Recurring [Member] | Corporates [Member]
Available for sale securities:
Available for sale securities		120,625		118,359
Recurring [Member] | Non-agency MBS [Member]
Available for sale securities:
Available for sale securities		185,113		173,099
Recurring [Member] | Other ABS [Member]
Available for sale securities:
Available for sale securities		106,974		47,621
Recurring [Member] | Equity securities [Member]
Available for sale securities:
Available for sale securities		904		1,948
Recurring [Member] | Level 1 [Member]
Available for sale securities:
Available for sale securities		190,840		62,220
Warrants		0		0
Servicing asset		0		0
Venture capital fund investments		0		0
Recurring [Member] | Level 1 [Member] | US Treasury Securities [Member]
Available for sale securities:
Available for sale securities		159,501		29,641
Recurring [Member] | Level 1 [Member] | Agency direct obligations [Member]
Available for sale securities:
Available for sale securities		30,435		30,631
Recurring [Member] | Level 1 [Member] | SBA pools [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 1 [Member] | Agency MBS [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 1 [Member] | Municipal bonds [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 1 [Member] | Corporates [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 1 [Member] | Non-agency MBS [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 1 [Member] | Other ABS [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 1 [Member] | Equity securities [Member]
Available for sale securities:
Available for sale securities		904		1,948
Recurring [Member] | Level 2 [Member]
Available for sale securities:
Available for sale securities		1,055,404		1,011,593
Warrants		0		0
Servicing asset		0		0
Venture capital fund investments		0		0
Recurring [Member] | Level 2 [Member] | US Treasury Securities [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 2 [Member] | Agency direct obligations [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 2 [Member] | SBA pools [Member]
Available for sale securities:
Available for sale securities		164,574		179,822
Recurring [Member] | Level 2 [Member] | Agency MBS [Member]
Available for sale securities:
Available for sale securities		674,285		614,922
Recurring [Member] | Level 2 [Member] | Municipal bonds [Member]
Available for sale securities:
Available for sale securities		98,931		98,490
Recurring [Member] | Level 2 [Member] | Corporates [Member]
Available for sale securities:
Available for sale securities		117,614		118,359
Recurring [Member] | Level 2 [Member] | Non-agency MBS [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 2 [Member] | Other ABS [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 2 [Member] | Equity securities [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member]
Available for sale securities:
Available for sale securities		295,098		220,720
Warrants	[1]	5,125		4,304
Servicing asset	[2]	1,450		1,222
Venture capital fund investments	[3]	4,232		3,704
Recurring [Member] | Level 3 [Member] | Venture Capital Fund Investments [Member]
Available for sale securities:
Venture capital fund investments		4,232		3,704
Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Agency direct obligations [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | SBA pools [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Agency MBS [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Municipal bonds [Member]
Available for sale securities:
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Corporates [Member]
Available for sale securities:
Available for sale securities		3,011	[2]	0
Recurring [Member] | Level 3 [Member] | Non-agency MBS [Member]
Available for sale securities:
Available for sale securities	[2]	185,113		173,099
Recurring [Member] | Level 3 [Member] | Other ABS [Member]
Available for sale securities:
Available for sale securities	[2]	106,974		47,621
Recurring [Member] | Level 3 [Member] | Equity securities [Member]
Available for sale securities:
Available for sale securities		0		0
Nonrecurring [Member] | Impaired Loans [Member]
Available for sale securities:
Other Assets, Fair Value Disclosure		9,754		9,135
Nonrecurring [Member] | Level 1 [Member] | Impaired Loans [Member]
Available for sale securities:
Other Assets, Fair Value Disclosure		0		0
Nonrecurring [Member] | Level 2 [Member] | Impaired Loans [Member]
Available for sale securities:
Other Assets, Fair Value Disclosure		0		0
Nonrecurring [Member] | Level 3 [Member] | Impaired Loans [Member]
Available for sale securities:
Other Assets, Fair Value Disclosure		$ 9,754		$ 9,135

[1] Low end of range relates to private equity warrant assets portfolio and high end of range relates to public equity warrant assets portfolio.

[2] The Company uses third-party pricing information without adjustment for this Level 3 fair value measurement.

[3] The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

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Intangible Assets Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 30	$ 62	$ 62	$ 125
Non-compete agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			1 year
Existing customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life			3 years

XML

Fair Value of Financial Assets and Liabilities Financial Instruments Not Carried at Fair Value, Estimated Fair Value (Details) - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014	Dec. 31, 2013
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents		$ 387,347	$ 85,942	$ 229,638	$ 105,730
Fair Value, Estimate Not Practicable, Cash and Cash Equivalents		387,347	85,942
Investment in time deposits		1,002	1,251
Investment securities—held to maturity, at amortized cost		392,872	300,425
Loans, net of unearned income		1,516,032	1,346,449
FHLB stock		2,787	2,091
Interest Receivable		13,110	11,878
Assets, Fair Value Disclosure [Abstract]
Investment in time deposits, fair value		1,002	1,251
Investment securities—held to maturity, fair value		392,815	306,406
Loans, net of unearned income, fair value		1,512,363	1,336,470
FHLB stock, fair value		2,787	2,091
Accrued interest receivable, fair value		13,110	11,878
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Non-maturity deposits	[1]	3,554,380	2,760,232
Time deposits		9,384	16,320
Liabilities, Fair Value Disclosure [Abstract]
Non-maturity deposits(1), fair value	[1]	3,554,380	2,760,232
Time deposits, estimated fair value		9,369	16,268
Future financing commitments, fair value		1,431,391	1,232,078
Level 1 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value, Estimate Not Practicable, Cash and Cash Equivalents		387,347	85,942
Assets, Fair Value Disclosure [Abstract]
Investment in time deposits, fair value		1,002	1,251
Investment securities—held to maturity, fair value		0	0
Loans, net of unearned income, fair value		0	0
FHLB stock, fair value		0	0
Accrued interest receivable, fair value		0	0
Liabilities, Fair Value Disclosure [Abstract]
Non-maturity deposits(1), fair value	[1]	3,554,380	2,760,232
Time deposits, estimated fair value		0	0
Future financing commitments, fair value		0	0
Level 2 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value, Estimate Not Practicable, Cash and Cash Equivalents		0	0
Assets, Fair Value Disclosure [Abstract]
Investment in time deposits, fair value		0	0
Investment securities—held to maturity, fair value		386,395	299,986
Loans, net of unearned income, fair value		0	0
FHLB stock, fair value		0	0
Accrued interest receivable, fair value		13,110	11,878
Liabilities, Fair Value Disclosure [Abstract]
Non-maturity deposits(1), fair value	[1]	0	0
Time deposits, estimated fair value		9,369	16,268
Future financing commitments, fair value		0	0
Level 3 [Member]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value, Estimate Not Practicable, Cash and Cash Equivalents		0	0
Assets, Fair Value Disclosure [Abstract]
Investment in time deposits, fair value		0	0
Investment securities—held to maturity, fair value		6,420	6,420
Loans, net of unearned income, fair value		1,512,363	1,336,470
FHLB stock, fair value		2,787	2,091
Accrued interest receivable, fair value		0	0
Liabilities, Fair Value Disclosure [Abstract]
Non-maturity deposits(1), fair value	[1]	0	0
Time deposits, estimated fair value		0	0
Future financing commitments, fair value		$ 1,431,391	$ 1,232,078

[1] Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

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Off-balance Sheet Risk, Commitments & Contingencies (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Unfunded lines of Credit [Member]
Other Commitments [Line Items]
Unused Commitments to Extend Credit	$ 1,400.0	$ 1,200.0
Standby Letters of Credit [Member]
Other Commitments [Line Items]
Unused Commitments to Extend Credit	$ 78.5	$ 68.4

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Fair Value of Financial Assets and Liabilities Narrative (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Level 3 Transfers in, Description		1	2	1	2
Maximum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated period of distributions from entities that calculate net asset value per share				13 years
Minimum [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Estimated period of distributions from entities that calculate net asset value per share				10 years
Recurring [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Venture capital fund investments		$ 4,232		$ 4,232		$ 3,704
Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Value, Investments, Entities that Calculate Net Asset Value Per Share		4,232		4,232		3,704
Venture capital fund investments	[1]	4,232		4,232		3,704
Recurring [Member] | Venture capital fund investments [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Value, Investments, Entities that Calculate Net Asset Value Per Share		4,232		4,232		3,704
Venture capital fund investments		4,232		4,232		$ 3,704
Recurring [Member] | Venture capital fund investments [Member] | Fair Value, Inputs, Level 3 [Member] | CRA Purposes [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Venture capital fund investments		1,600		1,600
Recurring [Member] | Venture capital fund investments [Member] | Fair Value, Inputs, Level 3 [Member] | Square 1 Ventures [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Venture capital fund investments		1,600		1,600
Recurring [Member] | Venture capital fund investments [Member] | Fair Value, Inputs, Level 3 [Member] | Parent Company [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Venture capital fund investments		$ 1,000		$ 1,000

[1] The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

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Organization and Basis of Presentation (Policies)

6 Months Ended

Jun. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting, Policy [Policy Text Block]

Basis of Presentation

These unaudited interim consolidated financial statements have been prepared on a consistent basis with the accounting policies described in the notes to the audited financial statements for the fiscal year ended December 31, 2014 included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”), as filed with the Securities and Exchange Commission ("SEC") on March 20, 2015. These unaudited interim consolidated financial statements have also been prepared in accordance with the instructions for Form 10-Q pursuant to the rules and regulations of the SEC, and as such certain footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted. Because the accompanying interim financial statements do not include all of the information and footnotes required by GAAP for annual financial statements, they should be read in conjunction with the audited financial statements for the fiscal year ended December 31, 2014 and notes thereto included in the 2014 Form 10-K. Certain prior year amounts have been reclassified to conform to current year presentation. Credit card and merchant income, previously included in service charges and fees, is presented separately and income from loan documentation fees, previously presented separately, is included in other noninterest income. The amount of foreign exchange clearing, previously presented in other assets, changes daily based on transactions and is presented in cash and due from banks. Merger-related expenses previously included in Other noninterest expenses in the quarterly report for the period ending March 31, 2015 is presented separately.

The amounts included in these financial statements are unaudited but, in the opinion of management, reflect all adjustments necessary to fairly present the Company’s financial position and results of operations for the interim periods. Unless otherwise noted, all adjustments are normal and recurring in nature. In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The results of operations for interim periods are not necessarily indicative of amounts expected for the entire year or future periods.

Consolidation, Policy [Policy Text Block]

Principles of Consolidation

The consolidated financial statements include the financial statements of Square 1 Financial and its consolidated subsidiaries and other entities in which it has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. In addition, the Company evaluates its relationships with other entities to identify whether they are variable interest entities ("VIEs") and to assess whether it is the primary beneficiary of such entities. If the determination was made that the Company is the primary beneficiary, then that entity would be included in the consolidated financial statements. If an entity is not a VIE, the Company also evaluates arrangements in which there is a general partner or managing member to determine whether consolidation is appropriate.

Square 1 Venture 1, L.P.-The Company owns approximately a 2% partnership interest in Square 1 Venture 1, L.P., which was formed for the primary purpose of sponsoring a fund of funds. The Company has determined that Square 1 Venture 1, L.P. is not a VIE for all periods presented; accordingly, Square 1 Venture 1, L.P. is not consolidated with the Company. The Company accounts for the investment in Square 1 Venture 1, L.P. using the equity method of accounting. For the three and six months ended June 30,2015, gains of $0.1 million were recognized. For the three and six months ended June 30,2014, gains of $0.7 million were recognized. The fair value of the investment at June 30, 2015 and December 31, 2014 was $1.6 million and $1.5 million, respectively, and is included in other assets on the balance sheet.

Use of Estimates, Policy [Policy Text Block]

Use of Estimates in the Preparation of Financial Statements

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The more significant estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, the valuation of investment securities, recognition and measurement of income tax assets and liabilities and the valuation of equity warrant assets and foreclosed assets.

Cash and Cash Equivalents, Policy [Policy Text Block]

Cash and Cash Equivalents

Cash and cash equivalents include noninterest-earning and interest-earning deposits at other institutions, federal funds sold and other short term investments. Generally, federal funds are purchased and sold for one-day periods. At times, the Bank places deposits with high credit-quality financial institutions in amounts which may be in excess of federally insured limits. The Bank is required to maintain reserve and clearing balances with the Federal Reserve Bank.

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Loans and Allowance for Loan Losses Schedule of Impaired Loans as they Relate to Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	$ 8,183	$ 8,104
Impaired loans with related allowance for loan losses	14,431	16,509
Impaired loans with no related allowance for loan losses	3,506	730
Recorded investment in impaired loans	17,937	17,239
Total of unpaid principal of impaired loans	19,248	19,813
Commercial loans [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	8,165	7,594
Impaired loans with related allowance for loan losses	14,046	15,258
Impaired loans with no related allowance for loan losses	1,739	730
Recorded investment in impaired loans	15,785	15,988
Total of unpaid principal of impaired loans	16,503	18,552
Commercial loans [Member] | Technology [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	5,385	4,523
Impaired loans with related allowance for loan losses	8,792	8,757
Impaired loans with no related allowance for loan losses	1,200	730
Recorded investment in impaired loans	9,992	9,487
Total of unpaid principal of impaired loans	10,507	10,398
Commercial loans [Member] | Life sciences [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	313	1,181
Impaired loans with related allowance for loan losses	1,911	2,511
Impaired loans with no related allowance for loan losses	0	0
Recorded investment in impaired loans	1,911	2,511
Total of unpaid principal of impaired loans	1,976	4,140
Commercial loans [Member] | Asset based loans [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans		280
Impaired loans with related allowance for loan losses		570
Impaired loans with no related allowance for loan losses		0
Recorded investment in impaired loans		570
Total of unpaid principal of impaired loans		570
Commercial loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	0	46
Impaired loans with related allowance for loan losses	0	175
Impaired loans with no related allowance for loan losses	539	0
Recorded investment in impaired loans	539	175
Total of unpaid principal of impaired loans	611	183
Commercial loans [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	2,467	1,564
Impaired loans with related allowance for loan losses	3,343	3,245
Impaired loans with no related allowance for loan losses	0	0
Recorded investment in impaired loans	3,343	3,245
Total of unpaid principal of impaired loans	3,409	3,261
Real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	18	510
Impaired loans with related allowance for loan losses	385	1,251
Impaired loans with no related allowance for loan losses	1,767	0
Recorded investment in impaired loans	2,152	1,251
Total of unpaid principal of impaired loans	2,745	1,261
Real estate loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Allowance for loan losses related to impaired loans	18	510
Impaired loans with related allowance for loan losses	385	1,251
Impaired loans with no related allowance for loan losses	1,767	0
Recorded investment in impaired loans	2,152	1,251
Total of unpaid principal of impaired loans	$ 2,745	$ 1,261

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Investment Securities Schedule of Available for Sale Securities, Gross Realized Gain (Loss), Disclosures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 95,671	$ 41,554	$ 157,745	$ 71,763
Gross gains	1,184	100	1,296	109
Gross losses	$ 159	$ 62	$ 475	$ 62

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Fair Value of Financial Assets and Liabilities Fair Value, Investments, Entities that Calculate Net Asset Value Per Share (Details) - Recurring [Member] - USD ($) $ in Thousands		Jun. 30, 2015	Dec. 31, 2014
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share		$ 4,232	$ 3,704
Level 1 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share		0	0
Level 2 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share		0	0
Level 3 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Value, Investments, Entities that Calculate Net Asset Value Per Share		4,232	3,704
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share	[1]	4,232	3,704
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		1,634	2,076
Level 3 [Member] | Venture capital fund investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Carrying Value, Investments, Entities that Calculate Net Asset Value Per Share		4,232	3,704
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share		4,232	3,704
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments		$ 1,634	$ 2,076

[1] The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

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Stock-based Compensation Plan (Tables)

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table presents a rollforward of the Company’s stock options outstanding during the six months ended June 30,2015:

					Weighted Average Remaining Contractual Life in Years
	Shares		Weighted Average Exercise Price
Outstanding at beginning of period	1,175,675		$	6.12	3.37
Granted	—		—
Exercised	(325,986	)	6.07
Forfeited	(660	)	6.00
Outstanding at end of period	849,029		$	6.14	3.97
Options exercisable at period end	533,319		$	6.07	3.94

Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block]

The following table provides information for restricted stock units issued under the stock-based incentive compensation plan during the six months ended June 30,2015:

	Shares		Weighted Average Grant Date Fair Value
Nonvested at beginning of period	376,372		$	10.01
Granted	101,548		26.22
Vested	(70,210	)	17.01
Forfeited	(13,626	)	9.83
Nonvested at end of period	394,084		$	12.94

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Loans and Allowance for Loan Losses Schedule of Credit Quality Indicators (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 1,524,842	$ 1,354,336
Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,441,554	1,252,604
Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	65,351	84,493
Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	17,937	17,239
Commercial loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,456,716	1,295,343
Commercial loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,375,580	1,200,976
Commercial loans [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	65,351	78,379
Commercial loans [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	15,785	15,988
Commercial loans [Member] | Technology [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	739,016	631,979
Commercial loans [Member] | Technology [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	693,726	575,483
Commercial loans [Member] | Technology [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	35,298	47,009
Commercial loans [Member] | Technology [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	9,992	9,487
Commercial loans [Member] | Life sciences [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	307,240	274,057
Commercial loans [Member] | Life sciences [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	293,746	257,143
Commercial loans [Member] | Life sciences [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	11,583	14,403
Commercial loans [Member] | Life sciences [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,911	2,511
Commercial loans [Member] | Asset based loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	143,204	177,701
Commercial loans [Member] | Asset based loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	128,946	160,558
Commercial loans [Member] | Asset based loans [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,258	16,573
Commercial loans [Member] | Asset based loans [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	570
Commercial loans [Member] | Venture capital/private equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	216,268	169,143
Commercial loans [Member] | Venture capital/private equity [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	216,268	169,143
Commercial loans [Member] | Venture capital/private equity [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial loans [Member] | Venture capital/private equity [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial loans [Member] | SBA and USDA [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	36,926	35,609
Commercial loans [Member] | SBA and USDA [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	32,175	35,040
Commercial loans [Member] | SBA and USDA [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	4,212	394
Commercial loans [Member] | SBA and USDA [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	539	175
Commercial loans [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	14,062	6,854
Commercial loans [Member] | Other [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	10,719	3,609
Commercial loans [Member] | Other [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Commercial loans [Member] | Other [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	3,343	3,245
Real estate loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	37,995	36,978
Real estate loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	35,843	29,613
Real estate loans [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	6,114
Real estate loans [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,152	1,251
Real estate loans [Member] | SBA and USDA [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	37,995	36,978
Real estate loans [Member] | SBA and USDA [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	35,843	29,613
Real estate loans [Member] | SBA and USDA [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	6,114
Real estate loans [Member] | SBA and USDA [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	2,152	1,251
Construction loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,752	4,035
Construction loans [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,752	4,035
Construction loans [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction loans [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction loans [Member] | SBA and USDA [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,752	4,035
Construction loans [Member] | SBA and USDA [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	6,752	4,035
Construction loans [Member] | SBA and USDA [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Construction loans [Member] | SBA and USDA [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Credit cards [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	23,379	17,980
Credit cards [Member] | Pass [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	23,379	17,980
Credit cards [Member] | Performing Criticized [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	0	0
Credit cards [Member] | Impaired [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0

XML

Stock-based Compensation Plan Restricted Stock Units (Details) - 6 months ended Jun. 30, 2015 - Restricted Stock Units (RSUs) [Member] - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested at beginning of period	376,372
Granted	101,548
Vested	(70,210)
Forfeited	(13,626)
Nonvested at end of period	394,084
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Nonvested at beginning of period, Weighted Average Grant Date Fair Value	$ 10.01
Granted, Weighted Average Grant Date Fair Value	26.22
Vested, Weighted Average Grant Date Fair Value	17.01
Forfeited, Weighted Average Grant Date Fair Value	9.83
Nonvested at end of period, Weighted Average Grant Date Fair Value	$ 12.94

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Equity Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Basic:
Net income	$ 9,919	$ 8,051	$ 18,072	$ 15,899
Less: dividends on preferred stock	0	1	0	63
Net income attributable to common shareholders	$ 9,919	$ 8,050	$ 18,072	$ 15,836
Basic weighted-average common shares outstanding	29,825	28,333	29,549	26,042
Earnings per share—basic	$ 0.33	$ 0.28	$ 0.61	$ 0.61
Diluted:
Net income attributable to common shareholders	$ 9,919	$ 8,050	$ 18,072	$ 15,836
Dividends on preferred stock	0	1	0	63
Convertible trust preferred securities	0	39	0	148
Net income attributable to common shares after assumed conversions	$ 9,919	$ 8,090	$ 18,072	$ 16,047
Basic weighted-average common shares outstanding	29,825	28,333	29,549	26,042
Effect of dilutive stock options and warrants	670	1,331	842	1,711
Diluted weighted-average common shares outstanding	30,495	29,664	30,391	27,753
Earnings per share—diluted	$ 0.33	$ 0.27	$ 0.60	$ 0.58

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Loans and Allowance for Loan Losses Schedule of Allowance for Loan Losses Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Allowance for Loan Losses [Roll Forward]
Beginning Balance	$ 24,739	$ 19,094	$ 22,906	$ 18,379
Charge Offs	3,467	741	7,467	3,093
Recoveries	7	53	393	156
Provision (Benefit)	3,758	3,150	9,205	6,114
Ending Balance	25,037	21,556	25,037	21,556
Commercial loans [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	23,659	18,185	21,373	17,090
Charge Offs	3,440	741	6,900	2,703
Recoveries	7	53	393	156
Provision (Benefit)	3,817	3,188	9,177	6,142
Ending Balance	24,043	20,685	24,043	20,685
Commercial loans [Member] | Technology [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	12,714	13,233	11,904	13,609
Charge Offs	1,630	332	3,691	2,166
Recoveries	6	53	392	156
Provision (Benefit)	3,369	426	5,854	1,781
Ending Balance	14,459	13,380	14,459	13,380
Commercial loans [Member] | Life sciences [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	4,581	3,403	3,657	1,971
Charge Offs	600	409	1,961	409
Recoveries	0	0	0	0
Provision (Benefit)	(73)	2,180	2,212	3,612
Ending Balance	3,908	5,174	3,908	5,174
Commercial loans [Member] | Asset based loans [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	3,025	877	3,364	684
Charge Offs	938	0	938	0
Recoveries	0	0	0	0
Provision (Benefit)	74	486	(265)	679
Ending Balance	2,161	1,363	2,161	1,363
Commercial loans [Member] | Venture capital/private equity [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	331	106	250	197
Charge Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (Benefit)	43	37	124	(54)
Ending Balance	374	143	374	143
Commercial loans [Member] | SBA and USDA [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	534	557	622	627
Charge Offs	26	0	64	128
Recoveries	1	0	1	0
Provision (Benefit)	113	57	63	115
Ending Balance	622	614	622	614
Commercial loans [Member] | Other [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	2,474	9	1,576	2
Charge Offs	246	0	246	0
Recoveries	0	0	0	0
Provision (Benefit)	291	2	1,189	9
Ending Balance	2,519	11	2,519	11
Real estate loans [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	826	703	1,310	1,163
Charge Offs	27	0	567	390
Recoveries	0	0	0	0
Provision (Benefit)	(100)	(1)	(44)	(71)
Ending Balance	699	702	699	702
Real estate loans [Member] | SBA and USDA [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	826	703	1,310	1,163
Charge Offs	27	0	567	390
Recoveries	0	0	0	0
Provision (Benefit)	(100)	(1)	(44)	(71)
Ending Balance	699	702	699	702
Construction loans [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	49	57	43	10
Charge Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (Benefit)	12	(38)	18	9
Ending Balance	61	19	61	19
Construction loans [Member] | SBA and USDA [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	49	57	43	10
Charge Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (Benefit)	12	(38)	18	9
Ending Balance	61	19	61	19
Credit cards [Member]
Allowance for Loan Losses [Roll Forward]
Beginning Balance	205	149	180	116
Charge Offs	0	0	0	0
Recoveries	0	0	0	0
Provision (Benefit)	29	1	54	34
Ending Balance	$ 234	$ 150	$ 234	$ 150

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Organization and Basis of Presentation (Notes)

6 Months Ended

Jun. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Basis of Presentation

ORGANIZATION AND BASIS OF PRESENTATION

Organization and Nature of Operations

Square 1 Financial, Inc. (the “Company”) is a bank holding company incorporated under the laws of Delaware on October 6, 2004. The Company closed on its initial public offering ("IPO") on March 31, 2014. The Company’s primary function is to serve as the holding company for its wholly owned subsidiary, Square 1 Bank. Square 1 Bank (the “Bank”) was incorporated under the laws of North Carolina on July 11, 2005 and commenced banking operations on August 8, 2005. The Bank is not a member of the Federal Reserve System. The Bank provides a full range of commercial banking services primarily to companies that have received institutional investment, typically from venture capital and private equity sources. The Bank also provides a full range of services to venture capital and private equity firms. The Bank’s primary source of revenue is interest earned from loans to customers and from invested cash and securities and non-interest income derived from various fees. During 2007, the Company formed Square 1 Ventures, LLC (a Delaware limited liability company), a wholly owned subsidiary established to sponsor a fund of funds. Square 1 Ventures, LLC is consolidated into the Company’s financial statements. In 2013, the Bank formed Square 1 Asset Management, a wholly owned subsidiary of the Bank and SEC-registered investment adviser, to provide an investment alternative for clients. The Bank also acquired the business operations and key employees of Sand Hill Finance LLC, a factoring company, as part of the Bank's strategy to continue to grow its asset-based lending portfolio and has integrated the factoring product into its existing suite of asset-based lending products.

The Bank operates one branch in Durham, NC and loan production offices in Menlo Park, San Francisco, San Diego, Campbell, and Los Angeles and Orange County, CA; and Austin, Boston, Chicago, Denver, Minneapolis, New York, Seattle and the District of Columbia area. The Company’s corporate headquarters are located in Durham, NC.

Proposed Merger with PacWest Bancorp

On March 1, 2015, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”) with PacWest Bancorp ("PacWest"), pursuant to which the Company will merge with and into PacWest, with PacWest as the surviving corporation (the “Merger”). The Merger Agreement also provides that immediately following the Merger, the Bank will merge with and into Pacific Western Bank, a California state-chartered bank and wholly owned subsidiary of PacWest, with Pacific Western Bank as the surviving bank. Under the terms and subject to the conditions of the Merger Agreement, each issued and outstanding share of common stock of the Company will be converted into the right to receive 0.5997 of a share of PacWest common stock. The transaction is currently valued at approximately $867 million. Completion of the Merger is subject to certain customary conditions, including approval by the Company’s shareholders and the receipt of certain required regulatory approvals. The Merger was approved by the Company's shareholders on July 29, 2015. PacWest and Square 1 expect that the Merger will be completed during the fourth quarter of 2015. However, it is possible that factors outside the control of both companies, including whether or when the required regulatory approvals will be received, could result in the Merger being completed at a different time or not at all. The Company recorded $0.8 million and $1.0 million, respectively, in merger-related expenses during the three and six months ended June 30,2015.

Basis of Presentation

These unaudited interim consolidated financial statements have been prepared on a consistent basis with the accounting policies described in the notes to the audited financial statements for the fiscal year ended December 31, 2014 included in the Company's Annual Report on Form 10-K for the year ended December 31, 2014 (“2014 Form 10-K”), as filed with the Securities and Exchange Commission ("SEC") on March 20, 2015. These unaudited interim consolidated financial statements have also been prepared in accordance with the instructions for Form 10-Q pursuant to the rules and regulations of the SEC, and as such certain footnote disclosures normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been condensed or omitted. Because the accompanying interim financial statements do not include all of the information and footnotes required by GAAP for annual financial statements, they should be read in conjunction with the audited financial statements for the fiscal year ended December 31, 2014 and notes thereto included in the 2014 Form 10-K. Certain prior year amounts have been reclassified to conform to current year presentation. Credit card and merchant income, previously included in service charges and fees, is presented separately and income from loan documentation fees, previously presented separately, is included in other noninterest income. The amount of foreign exchange clearing, previously presented in other assets, changes daily based on transactions and is presented in cash and due from banks. Merger-related expenses previously included in Other noninterest expenses in the quarterly report for the period ending March 31, 2015 is presented separately.

The amounts included in these financial statements are unaudited but, in the opinion of management, reflect all adjustments necessary to fairly present the Company’s financial position and results of operations for the interim periods. Unless otherwise noted, all adjustments are normal and recurring in nature. In preparing financial statements that conform to GAAP, management must make estimates and assumptions that affect the reported amounts of assets and liabilities, the reported amounts of revenues and expenses and the disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The results of operations for interim periods are not necessarily indicative of amounts expected for the entire year or future periods.

Principles of Consolidation

The consolidated financial statements include the financial statements of Square 1 Financial and its consolidated subsidiaries and other entities in which it has a controlling financial interest. All significant intercompany balances and transactions have been eliminated in consolidation. In addition, the Company evaluates its relationships with other entities to identify whether they are variable interest entities ("VIEs") and to assess whether it is the primary beneficiary of such entities. If the determination was made that the Company is the primary beneficiary, then that entity would be included in the consolidated financial statements. If an entity is not a VIE, the Company also evaluates arrangements in which there is a general partner or managing member to determine whether consolidation is appropriate.

Square 1 Venture 1, L.P.-The Company owns approximately a 2% partnership interest in Square 1 Venture 1, L.P., which was formed for the primary purpose of sponsoring a fund of funds. The Company has determined that Square 1 Venture 1, L.P. is not a VIE for all periods presented; accordingly, Square 1 Venture 1, L.P. is not consolidated with the Company. The Company accounts for the investment in Square 1 Venture 1, L.P. using the equity method of accounting. For the three and six months ended June 30,2015, gains of $0.1 million were recognized. For the three and six months ended June 30,2014, gains of $0.7 million were recognized. The fair value of the investment at June 30, 2015 and December 31, 2014 was $1.6 million and $1.5 million, respectively, and is included in other assets on the balance sheet.

On April 1, 2014, Square 1 Ventures, LLC transferred the contract for the management of Square 1 Venture 1, L.P. to Industry Ventures, a fund-of-funds manager in San Francisco, CA. In connection with this transfer, the Company recorded a gain of $0.5 million. The impact of the sale of the management contract has not had an ongoing material impact to the Company's results of operations or financial condition.

Use of Estimates in the Preparation of Financial Statements

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The more significant estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, the valuation of investment securities, recognition and measurement of income tax assets and liabilities and the valuation of equity warrant assets and foreclosed assets.

Cash and Cash Equivalents

Cash and cash equivalents include noninterest-earning and interest-earning deposits at other institutions, federal funds sold and other short term investments. Generally, federal funds are purchased and sold for one-day periods. At times, the Bank places deposits with high credit-quality financial institutions in amounts which may be in excess of federally insured limits. The Bank is required to maintain reserve and clearing balances with the Federal Reserve Bank. Accordingly, the Bank has amounts restricted for this purpose of $24.2 million and $19.8 million in the consolidated balance sheet at June 30, 2015 and December 31, 2014, respectively.

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Equity Accumulated Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification adjustment for losses (gains) included in net income	$ (1,396)	$ (80)	$ (1,021)	$ (80)
Related tax (expense) benefit	523	30	383	30
Reclassification adjustment for gains included in net income, net of tax	$ (873)	$ (50)	$ (638)	$ (50)

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Investment Securities Schedule of Investments in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available for sale securities:
Less Than 12 Months, Fair Value	$ 271,706	$ 299,380
Less Than 12 Months, Unrealized Losses	(3,158)	(2,867)
12 Months or Greater, Fair Value	60,359	48,387
12 Months or Greater, Unrealized Losses	(1,684)	(1,766)
Total, Fair Value	332,065	347,767
Total, Unrealized Losses	(4,842)	(4,633)
Held to maturity securities:
Less Than 12 Months, Fair Value	163,108	51,616
Less Than 12 Months, Unrealized Losses	(5,776)	(1,962)
12 Months or Greater, Fair Value	17,576	24,964
12 Months or Greater, Unrealized Losses	(2,365)	(2,291)
Total, Fair Value	180,684	76,580
Total, Unrealized Losses	(8,141)	(4,253)
US Treasury Securities [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	19,522	9,895
Less Than 12 Months, Unrealized Losses	(6)	(7)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	19,522	9,895
Total, Unrealized Losses	(6)	(7)
SBA pools [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	8,167	34,287
Less Than 12 Months, Unrealized Losses	(46)	(296)
12 Months or Greater, Fair Value	3,483	4,186
12 Months or Greater, Unrealized Losses	0	(9)
Total, Fair Value	11,650	38,473
Total, Unrealized Losses	(46)	(305)
Agency MBS [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	120,677	128,717
Less Than 12 Months, Unrealized Losses	(1,523)	(889)
12 Months or Greater, Fair Value	21,699	17,935
12 Months or Greater, Unrealized Losses	(468)	(226)
Total, Fair Value	142,376	146,652
Total, Unrealized Losses	(1,991)	(1,115)
Held to maturity securities:
Less Than 12 Months, Fair Value	49,421	0
Less Than 12 Months, Unrealized Losses	(2,346)	0
12 Months or Greater, Fair Value	2,401	5,856
12 Months or Greater, Unrealized Losses	(135)	(107)
Total, Fair Value	51,822	5,856
Total, Unrealized Losses	(2,481)	(107)
Municipal bonds [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	15,410	1,671
Less Than 12 Months, Unrealized Losses	(268)	(3)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	15,410	1,671
Total, Unrealized Losses	(268)	(3)
Held to maturity securities:
Less Than 12 Months, Fair Value	84,251	10,657
Less Than 12 Months, Unrealized Losses	(2,176)	(116)
12 Months or Greater, Fair Value	8,755	12,688
12 Months or Greater, Unrealized Losses	(364)	(329)
Total, Fair Value	93,006	23,345
Total, Unrealized Losses	(2,540)	(445)
Corporates [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	0	24,140
Less Than 12 Months, Unrealized Losses	0	(398)
12 Months or Greater, Fair Value	5,005	0
12 Months or Greater, Unrealized Losses	(15)	0
Total, Fair Value	5,005	24,140
Total, Unrealized Losses	(15)	(398)
Held to maturity securities:
Less Than 12 Months, Fair Value	29,436	40,959
Less Than 12 Months, Unrealized Losses	(1,254)	(1,846)
12 Months or Greater, Fair Value	6,420	6,420
12 Months or Greater, Unrealized Losses	(1,866)	(1,855)
Total, Fair Value	35,856	47,379
Total, Unrealized Losses	(3,120)	(3,701)
Non-agency MBS [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	71,196	61,284
Less Than 12 Months, Unrealized Losses	(888)	(637)
12 Months or Greater, Fair Value	26,823	21,558
12 Months or Greater, Unrealized Losses	(679)	(823)
Total, Fair Value	98,019	82,842
Total, Unrealized Losses	(1,567)	(1,460)
Other ABS [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	35,830	37,527
Less Than 12 Months, Unrealized Losses	(232)	(146)
12 Months or Greater, Fair Value	3,349	4,708
12 Months or Greater, Unrealized Losses	(522)	(708)
Total, Fair Value	39,179	42,235
Total, Unrealized Losses	(754)	(854)
Equity securities [Member]
Available for sale securities:
Less Than 12 Months, Fair Value	904	1,859
Less Than 12 Months, Unrealized Losses	(195)	(491)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Unrealized Losses	0	0
Total, Fair Value	904	1,859
Total, Unrealized Losses	$ (195)	$ (491)

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Derivatives (Policies)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives, Policy [Policy Text Block]

The Company receives equity warrants with net settlement terms in connection with extending loan commitments to certain of its customers. These warrants are obtained at the inception of a loan facility or the amendment of a loan facility. These warrants are not obtained in lieu of other fees, interest or payments. These warrants potentially provide an additional return, in addition to the traditional loan yield from interest and fees, in the event of a liquidity event of the borrowing company. The Company holds these equity warrants for future investment gains, rather than to hedge economic risks. In general, the equity warrants entitle the Company to buy a specific number of shares of the customer’s stock at a specific price over a specific time period. The warrants may also include contingent provisions which provide for additional shares to be purchased at a specific price if defined future events occur, such as future rounds of equity financing by the customer, or upon additional borrowings by the customer. All of the Company’s equity warrants contain net share settlement provisions, which permit the customer to deliver to the Company, upon the Company’s exercise of the warrant, the amount of shares with a current fair value equal to the net gain under the warrant agreement.

ASC 815 Derivatives and Hedging requires that all derivative instruments be recorded on the balance sheet at fair value. Equity warrants with net share settlement provisions are considered derivatives. The Company's equity warrants portfolio is primarily comprised of holdings in non-public companies and the Company’s practice generally is to monetize its positions as soon as a liquidity event occurs. Often there is a lock-up period requiring the Company to hold its equity position in a publicly traded security until the expiration of the lock-up period. The Company estimates the initial fair value of non-public company equity warrants using a Black-Scholes option pricing model to approximate fair market value. The model estimates market value for each warrant based on the most recent equity offering at the time of issuance, the warrant specific exercise price, the warrant’s expected life, a risk-free interest rate based on a duration matched U.S. Treasury rate and volatility factors derived from indices of comparable publicly traded companies. On a monthly basis, the Company adjusts the value of equity warrants in non-public companies using a Black-Scholes model to approximate fair market value based on changes to the risk-free interest rate, the volatility rate and the warrant’s expected life.

The Company also holds warrants in public companies. When a private company goes public there is often a lock-up period requiring the Company to hold its equity position in a publicly traded security until the expiration of the lock-up period. The Company adjusts the value of equity warrants in public companies on a monthly basis based on the month-end closing stock price adjusted for the option value of the warrant. The model estimates market value for each warrant based on the share price as of the evaluation date, the warrant specific exercise price, the warrant’s expected life, a risk-free interest rate based on a duration matched U.S. Treasury rate and uses a company specific volatility factor. See Note 15 for further information regarding the fair value of the Company's equity warrants. Any changes from the grant date in the fair value of equity warrant assets will be recognized as increases or decreases to warrant valuation and as unrealized gains or losses in non-interest income. When a portfolio company completes an initial public offering on a publicly reported market or is acquired, the Company may exercise these equity warrant assets for shares or cash. Shares received from the exercise of warrants and subject to lock-up agreements are held as equity securities in the Company's available for sale portfolio.

The grant date fair values of equity warrants received in connection with extending loan commitments are considered to be loan fees and are recognized over the life of the loan commitment as an adjustment to loan yield through loan interest income.

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Loans and Allowance for Loan Losses (Policies)

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Transfers and Servicing of Financial Assets, Policy [Policy Text Block]

The Company accounts for loan servicing rights or liabilities under Accounting Standards Codification (ASC) 860, “Transfers and Servicing.” ASC 860 requires the Company to recognize a servicing asset or servicing liability each time it undertakes an obligation to service a financial asset. Changes in the fair value of the servicing asset are recognized in other noninterest income. The valuation methodology estimates the present value of future cash flows based on the unique characteristics of the loan, market-based assumptions for prepayment speeds, and discount rate assumptions. The servicing asset is recorded in intangible assets in the financial statements.

See Note 15 for a summary of the activity for the Company's servicing assets.

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Intangible Assets Schedule of Finite-Lived Intangible Assets Expected Amortization (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$ 99
2016	196
Total	$ 295

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Investment Securities Investment Securities Amortized Cost by Contractual Maturity (Details) $ in Thousands	Jun. 30, 2015 USD ($)
Available for sale securities:
Total Amortized Cost	$ 1,525,977
Less than One Year Amortized Cost	37,716
After One Year to Five Years Amortized Cost	255,148
After Five Years to Ten Years Amortized Cost	174,330
After Ten Years Amortized Cost	1,058,783
Held to maturity securities:
Total Amortized Cost	392,872
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	0
After Five Years to Ten Years Amortized Cost	18,295
After Ten Years Amortized Cost	374,577
US Treasury Securities [Member]
Available for sale securities:
Total Amortized Cost	159,264
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	159,264
After Five Years to Ten Years Amortized Cost	0
After Ten Years Amortized Cost	0
Agency direct obligations [Member]
Available for sale securities:
Total Amortized Cost	30,323
Less than One Year Amortized Cost	20,272
After One Year to Five Years Amortized Cost	10,051
After Five Years to Ten Years Amortized Cost	0
After Ten Years Amortized Cost	0
SBA pools [Member]
Available for sale securities:
Total Amortized Cost	162,014
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	4,136
After Five Years to Ten Years Amortized Cost	82,765
After Ten Years Amortized Cost	75,113
Agency MBS [Member]
Available for sale securities:
Total Amortized Cost	666,405
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	2,398
After Five Years to Ten Years Amortized Cost	29,622
After Ten Years Amortized Cost	634,385
Held to maturity securities:
Total Amortized Cost	102,368
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	0
After Five Years to Ten Years Amortized Cost	0
After Ten Years Amortized Cost	102,368
Municipal bonds [Member]
Available for sale securities:
Total Amortized Cost	97,417
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	0
After Five Years to Ten Years Amortized Cost	15,185
After Ten Years Amortized Cost	82,232
Held to maturity securities:
Total Amortized Cost	230,582
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	0
After Five Years to Ten Years Amortized Cost	18,295
After Ten Years Amortized Cost	212,287
Corporates [Member]
Available for sale securities:
Total Amortized Cost	117,397
Less than One Year Amortized Cost	13,928
After One Year to Five Years Amortized Cost	41,843
After Five Years to Ten Years Amortized Cost	12,954
After Ten Years Amortized Cost	48,672
Held to maturity securities:
Total Amortized Cost	59,922
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	0
After Five Years to Ten Years Amortized Cost	0
After Ten Years Amortized Cost	59,922
Non-agency MBS [Member]
Available for sale securities:
Total Amortized Cost	185,662
Less than One Year Amortized Cost	0
After One Year to Five Years Amortized Cost	701
After Five Years to Ten Years Amortized Cost	7,417
After Ten Years Amortized Cost	177,544
Other ABS [Member]
Available for sale securities:
Total Amortized Cost	107,495
Less than One Year Amortized Cost	3,516
After One Year to Five Years Amortized Cost	36,755
After Five Years to Ten Years Amortized Cost	26,387
After Ten Years Amortized Cost	$ 40,837

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Fair Value of Financial Assets and Liabilities (Policies)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurement, Policy [Policy Text Block]

Fair Value Measurements

The Company's marketable investment securities and derivative instruments are financial instruments recorded at fair value on a recurring basis. The Company makes estimates regarding valuation of assets and liabilities measured at fair value in preparing its consolidated financial statements. ASC 825-10 provides an option to report selected financial assets and liabilities at fair value. The Company has not elected to measure any financial assets or liabilities using the fair value option under ASC 825-10.

ASC 820, Fair Value Measurements and Disclosures defines fair value as the price that would be received to sell an asset or paid to transfer a liability (the “exit price”) in an orderly transaction between market participants at the measurement date. Fair value is a market-based measurement considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measurement.

ASC 820 establishes a three-level hierarchy for disclosure of assets and liabilities recorded at fair value. The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company's estimates about market data.

The three levels for measuring fair value are based on the reliability of inputs and are as follows:

Level 1 Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Valuation adjustments and block discounts are not applied to instruments utilizing Level 1 inputs. Since valuations are based on quoted prices that are readily available in an active market, valuation of these products does not entail a significant degree of judgment. Assets utilizing Level 1 inputs include exchange-traded equity securities.

Level 2

Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly. Assets and liabilities utilizing Level 2 inputs include: U.S. treasury and agency securities, mortgage-backed securities, collateralized mortgage obligations, commercial mortgage-backed securities, municipal bonds and notes, Over-the-Counter (“OTC”) derivative instruments (foreign exchange forwards and option contracts, interest rate swaps related to the Company's senior notes, subordinated notes and junior subordinated debentures), and equity warrant assets for shares of public company capital stock.

Level 3

Valuations based on inputs that are unobservable and significant to the overall fair value measurement. Assets utilizing Level 3 inputs include: limited partnership interests in private equity funds, direct equity investments in private companies, mortgage-backed securities, and equity warrant assets for shares of private company capital stock.

For inactive markets, there is little information, if any, to evaluate if individual transactions are orderly. Accordingly, the Company is required to estimate, based upon all available facts and circumstances, the degree to which orderly transactions are occurring. Price quotes based upon transactions that are not orderly are not considered to be determinative of fair value and are given little, if any, weight in measuring fair value. Price quotes based upon transactions that are orderly are considered in determining fair value, with the weight given based upon the facts and circumstances. If sufficient information is not available to determine if price quotes are based upon orderly transactions, less weight is given to the price quote relative to other transactions that are known to be orderly.

To the extent that the 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 that the Company uses to determine 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 is determined is based on the lowest level input that is significant to the fair value measurement in its entirety.

Investment securities are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted market prices, if available. If quoted market prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions.

The types of instruments valued based on quoted market prices in active markets include the Company’s U.S. government and agency securities, mortgage-backed securities and asset-backed securities (“ABS”). Such instruments are generally classified within level 1 or level 2 of the fair value hierarchy. As required by ASC 820, the Company does not adjust the quoted price for such instruments.

Level 3 valuations are for instruments that are not traded in active markets or are subject to transfer restrictions, and may be adjusted to reflect illiquidity and/or non-transferability, with such adjustment generally based on available market evidence. In the absence of such evidence, management’s best estimate is used. Such instruments in this category include some investment securities, all impaired loans, warrants and foreclosed assets.

Transfers between fair value hierarchy levels would represent assets or liabilities that were previously categorized at a higher level for which the inputs to the estimate became less observable or classified at a lower level for which the inputs became more observable during the period. The Company's policy is to recognize transfers between levels at the end of the period.

The following is a summary of the valuation methods and significant assumptions used to estimate fair value:

Available for sale securities

Valuations for the available-for-sale securities are provided by third party external pricing service providers. The Company reviews the methodologies used to determine the fair value, including understanding the nature and observability of the inputs used to determine the price. The Company obtains additional corroboration depending on the type of security, the frequency of trades of the security and the level of liquidity or depth of the market.

Following is a summary of the significant inputs used for each class of assets and liabilities:

U.S. pass-through government mortgages are evaluated based on benchmark curves as well as security set-ups, to be announced (TBA) market, and broker feeds. Fixed-rate Ginnie Mae pools backed by fixed rate reverse mortgages are evaluated based on prepayment speeds, cash flows, swap curves, spread adjustments, coupon and average life. New issue data, monthly payment information and collateral performance are also monitored.

U.S. government collateralized mortgage obligations are evaluated based on benchmark curves, security set-up, prepayment speeds, cashflow scenario analysis, supporting collateral identification and collateral performance. Adjustments are made for spread, yield, price and prepayment speeds. Volatility-driven, multi-dimensional spread tables as well as Option Adjusted Spread model applications are applied.

Non-agency mortgage evaluation methodology is based on security set-up, prepayment speeds, cashflow scenario analysis, benchmark comparisons and supporting collateral identification and performance. Depending on the characteristics of a given tranche, Option Adjust Spread model or multi-dimensional single cash flow stream model is applied.

Municipal bonds are evaluated based on stated coupon rates, final maturity dates, callable options and yield analysis including benchmark comparisons, yield to maturity and yield to worst. Adjustments are made for ratings updates and material event notices. Quotes are based on spreads to other municipal benchmark bonds with similar characteristics or relative to market rates on U.S. treasury bonds of similar maturity.

Corporate and trust preferred security methodology is based on security set up, benchmark comparisons, yield to maturity, issuer name, coupon rate, maturity date and any applicable issuer call option feature. An option adjusted spread model is used for issues that have early redemption features. Adjustments are made for corporate actions. The Floating Rate Note model is applied to variable rate note evaluations.

The methodology for fixed and floating rate asset backed securities is based on benchmark curves as well as security set-up, prepayment speeds, benchmark yields, spread adjustments, ratings updates, collateral performance and price history. Tranche level attributes, cash flows and market color (as available) are also monitored.

SBA pool evaluation methodology is determined by benchmark rates and swap curves, cashflow scenario analysis, coupon, maturity, and supporting collateral identification and collateral performance. The unique structures associated with SBA and SBIC programs are taken into account. Additional adjustments can be made based on the original and remaining terms, coupon, seasonality of the pools and default factors.

U.S. treasury securities are evaluated based on security set up, yield to maturity and through reviewing Treasury trading platform feeds (both active market makers and inter-dealer brokers) for consistency and outliers.

Equity warrant assets

Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on a modified Black-Scholes pricing model. The model uses the stock price of publicly-traded companies, stated exercise prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions for companies with 90 or more days of trading history. For public companies with less than 90 days of trading history, the iShares Russell Microcap index (IWC) is used to estimate volatility. Further, option expiration dates are modified to account for estimates to actual life relative to stated expiration.

Fair value measurements of equity warrant assets of private portfolio companies are priced based on a modified Black-Scholes option pricing model to estimate asset value by using stated exercise prices, option expiration dates, risk-free interest rates and option volatility assumptions. Option volatility assumptions used in the modified Black-Scholes model are based on the iShares Russell Microcap index (IWC). Option expiration dates are modified to account for estimates to actual life relative to stated expiration.

Servicing asset

Valuation for the Company's servicing asset is provided by a third party external pricing service provider. The Company reviews the methodology used to determine the fair value, including understanding the nature and observability of the inputs used to determine the fair value. The valuation uses generated future cashflows for each asset based on the asset's unique characteristics, market-based assumptions for prepayment speeds and, in the case of non-guaranteed portions of SBA loans, losses and recoveries. The present value of the future cash flows are then calculated utilizing market-based discount rate assumptions. In all cases, each loan’s expected payment for each monthly period is modeled in order to create the most detailed cash flow stream possible.

Venture capital fund investments

To determine the estimated fair value of the Company's venture capital fund investments, the Company evaluates various factors related to the underlying private company entities. The factors are specific to each underlying private company. The factors evaluated include, but are not limited to, actual and forecasted results, cash position, and market comparable companies.

Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Policy Text Block]

FASB guidance (ASC 825-10-50-6A) requires disclosures about the fair value measurements of investments in certain entities that calculate net asset value per share or its equivalents. These disclosures include the fair value of funds; significant investment strategies of the investees; for investments that cannot be redeemed, estimates of the time periods over which underlying assets are expected to be liquidated; the amounts of the Company's unfunded commitments; redemption features of the investments; restrictions on the ability to sell the investments; and information about sales in certain circumstances.

The Company has investments in venture capital funds that calculate net asset value per share. The Company's investments in venture capital funds generally cannot be redeemed. Alternatively, the Company expects distributions, if any, to be received primarily through M&A activity and IPOs of the underlying assets of the fund. The Company currently does not have any plans to sell any of these fund investments. If the Company decides to sell these investments in the future, generally the investee fund’s management must approve of the buyer before the sale of the investments can be completed. The fair values of the fund investments have been estimated using the net asset value per share of the investments, adjusted for any differences between the Company's measurement date and the date of the fund investment’s net asset value based on the most recently available financial information from the investee general partner. The most recently available financial information is generally as of the end of the previous quarter. For example, the June 30, 2015 financial statements reflect the March 31, 2015 financial information from the investee general partner, adjusted for any contributions paid, distributions received from the investment, and significant fund transactions or market events during the reporting period.

Foreclosed Assets Policy [Policy Text Block]

Foreclosed Assets — Upon acquisition, foreclosed assets are initially recorded at the fair value of the asset less cost to sell. Any excess of the recorded investment over the fair value of the property received is charged to the allowance for loan losses. Subsequently, foreclosed assets are carried at the lower of carrying value or net realizable value. Reviews will be performed by management and any subsequent write-downs due to the excess of carrying value of a property over its estimated fair value (less estimated costs to sell) are charged against other expenses. Foreclosed assets are included in other assets in the accompanying consolidated balance sheets.

Fair Value of Financial Instruments, Policy [Policy Text Block]

Financial Instruments Not Carried at Fair Value

FASB issued guidance over financial instruments (ASC 825-10-65) requires that the Company disclose estimated fair values for the Company's financial instruments not carried at fair value. Fair value estimates, methods and assumptions, set forth below for the Company's financial instruments, are made solely to comply with the requirements of ASC 825.

Fair values are based on estimates or calculations at the transaction level using present value techniques in instances where quoted market prices are not available. Because broadly traded markets do not exist for many of the Company's financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. Fair valuations are management’s estimates of the values, and they are calculated based on indicator prices corroborated by observable market quotes or pricing models, the economic and competitive environment, the characteristics of the financial instruments, expected losses, and other such factors.

These calculations are subjective in nature, involve uncertainties and matters of significant judgment, and do not include tax ramifications; therefore, the results cannot be determined with precision or substantiated by comparison to independent markets, and they may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein does not represent, and should not be construed to represent, the underlying value of the Company.

The following describes the methods and assumptions used in estimating the fair values of financial instruments, excluding financial instruments already recorded at fair value as described above.

Cash and due from banks, federal funds sold and short-term investments

The carrying amounts for cash and due from banks, federal funds sold and short-term investments approximate fair value because of the short maturities of those instruments.

Loans

The fair value of the net loan portfolio has been estimated based on management’s assumptions with respect to present value of expected cash flows, discounted at an interest rate giving consideration to estimated prepayment risk and credit loss factors. There is no material difference between carrying value and fair value of loans as outstanding loans are predominately at variable rates.

Investment securities—held to maturity

The fair value of investment securities held to maturity are based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly.

FHLB stock

The carrying amount of FHLB stock approximates fair value as it is not practicable to determine the fair value due to restrictions placed on its transferability.

Accrued Interest Receivable

The carrying amount of accrued interest receivable approximates fair value due to the short-term nature of the balance.

Deposits

The fair values of deposits with no stated maturities are predominately at variable rates and, accordingly, the fair values have been estimated to equal the carrying amounts (the amount payable on demand). The fair values of certificates of deposits are estimated by discounting the future cash flows using the current rates offered for similar deposits with the same remaining maturities.

Short-term borrowings

The Company’s short-term borrowings include securities sold under repurchase agreements, federal funds purchased and short-term lines of credit. The carrying amount is a reasonable estimate of fair value because of the relatively short time between the origination of the borrowing and its contractual maturity.

Long-term debt

The Company’s long-term debt includes the Company’s convertible subordinated debentures. Fair value of long-term debt is estimated by discounting the future cash flows using current rates offered with the same maturities, price indications from reputable dealers or utilizing observable market prices of the underlying instrument, whichever is deemed more reliable.

Financial instruments with off-balance sheet risk

With regard to financial instruments with off-balance sheet risk discussed in Note 16, carrying amounts are reasonable estimates of the fair values for such financial instruments. Commitments to extend credit generally result in loans with a market interest rate if funded.

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Off-balance Sheet Risk, Commitments & Contingencies (Policies)

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Off-Balance-Sheet Credit Exposure, Policy [Policy Text Block]

The Company’s exposure to credit loss in the event of nonperformance by the other party is represented by the contractual amount of these instruments. The Company uses the same credit policies in making these commitments as it does for on-balance sheet instruments. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies but may include cash in deposit accounts, trade accounts receivable, property, plant, and equipment and intellectual property. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.

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Interim Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 18,072	$ 15,899
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	631	465
Amortization on investment securities, net	11,900	8,211
Provision for loan losses	9,205	6,114
Stock-based compensation	2,221	1,707
Gain on sale of securities available for sale	(821)	(47)
Investment impairment	0	43
Deferred income tax provision	(1,674)	(2,299)
Earnings on bank owned life insurance	(859)	(607)
Changes in assets and liabilities:
Accrued interest receivable and other assets	(7,946)	(630)
Accrued interest payable and other liabilities	6,483	1,056
Net cash provided by operating activities	37,212	29,912
Cash flows from investing activities:
Net increase in investment in time deposits	249	0
Purchase of securities available for sale	(411,900)	(229,866)
Purchase of securities held to maturity	(103,951)	(57,373)
Proceeds from calls/maturities of securities available for sale	102,423	69,177
Proceeds from sales of securities available for sale	55,322	2,586
Proceeds from paydowns of securities held to maturity	9,539	0
Net increase in loans	(176,656)	(72,017)
Purchase of bank owned life insurance	0	(2,635)
Purchases of premises and equipment	(619)	(907)
Net cash used in investing activities	(525,593)	(291,035)
Cash flows from financing activities:
Net increase in deposits	787,212	338,438
Net decrease in repurchase agreements	0	(12,737)
Preferred dividends paid	0	(63)
Issuance of common stock, net of issuance costs	260	58,758
Proceeds from issuance of shares under stock-based compensation plan	2,314	635
Net cash provided by financing activities	789,786	385,031
Net change in cash and cash equivalents	301,405	123,908
Cash and cash equivalents at beginning of period	85,942	105,730
Cash and cash equivalents at end of period	387,347	229,638
Supplemental statement of cash flow disclosures
Interest paid	449	293
Income taxes paid	7,285	4,268
Conversion of trust preferred securities to common stock	$ 0	$ 7,415

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Investment Securities (Tables)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Marketable Securities [Table Text Block]

The following tables summarize the amortized cost and fair value of securities available for sale and securities held to maturity at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
U.S. treasuries	$	159,264	$	243	$	(6	)	$	159,501
Agency direct obligations	30,323		112		—			30,435
SBA pools	162,014		2,606		(46		)	164,574
Agency MBS	666,405		9,871		(1,991		)	674,285
Municipal bonds	97,417		1,782		(268		)	98,931
Corporates	117,397		3,243		(15		)	120,625
Non-agency MBS	185,662		1,018		(1,567		)	185,113
Other ABS	107,495		233		(754		)	106,974
Equity securities	1,099		—		(195		)	904
Total	$	1,527,076	$	19,108	$	(4,842	)	$	1,541,342
Held to maturity securities:
Agency MBS	$	102,368	$	1,991	$	(2,481	)	$	101,878
Municipal bonds	230,582		5,752		(2,540		)	233,794
Corporates	59,922		341		(3,120		)	57,143
Total	$	392,872	$	8,084	$	(8,141	)	$	392,815

(in thousands)	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
U.S. treasuries	$	29,604	$	44	$	(7	)	$	29,641
Agency direct obligations	30,536		95		—			30,631
SBA pools	177,982		2,145		(305		)	179,822
Agency MBS	606,677		9,360		(1,115		)	614,922
Municipal bonds	96,016		2,477		(3		)	98,490
Corporates	117,025		1,732		(398		)	118,359
Non-agency MBS	173,322		1,237		(1,460		)	173,099
Other ABS	48,450		25		(854		)	47,621
Equity securities	2,422		17		(491		)	1,948
Total	$	1,282,034	$	17,132	$	(4,633	)	$	1,294,533
Held to maturity securities:
Agency MBS	$	58,851	$	1,015	$	(107	)	$	59,759
Municipal bonds	181,567		9,187		(445		)	190,309
Corporates	60,007		32		(3,701		)	56,338
Total	$	300,425	$	10,234	$	(4,253	)	$	306,406

Available-for-sale Securities [Table Text Block]

The proceeds from sales and calls of securities and the associated gains and losses were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2015		2014		2015		2014
Proceeds	$	95,671	$	41,554	$	157,745	71,763
Gross gains	1,184		100		1,296		109
Gross losses	159		62		475		62

Schedule of Unrealized Loss on Investments [Table Text Block]

The following tables show the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired. Investment securities contained in the table are aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available for sale securities:
U.S. treasuries	$	19,522	$	(6	)	$	—	$	—		$	19,522	$	(6	)
SBA pools	8,167		(46		)	$	3,483	—			11,650		(46		)
Agency MBS	120,677		(1,523		)	21,699		(468		)	142,376		(1,991		)
Municipal bonds	15,410		(268		)	—		—			15,410		(268		)
Corporates	—		—			5,005		(15		)	5,005		(15		)
Non-agency MBS	71,196		(888		)	26,823		(679		)	98,019		(1,567		)
Other ABS	35,830		(232		)	3,349		(522		)	39,179		(754		)
Equity securities	904		(195		)	—		—			904		(195		)
Total	$	271,706	$	(3,158	)	$	60,359	$	(1,684	)	$	332,065	$	(4,842	)
Held to maturity securities:
Agency MBS	$	49,421	$	(2,346	)	$	2,401	$	(135	)	$	51,822	$	(2,481	)
Municipal bonds	84,251		(2,176		)	8,755		(364		)	93,006		(2,540		)
Corporates	29,436		(1,254		)	6,420		(1,866		)	35,856		(3,120		)
Total	$	163,108	$	(5,776	)	$	17,576	$	(2,365	)	$	180,684	$	(8,141	)

(in thousands)	December 31, 2014
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available for sale securities:
U.S. treasuries	$	9,895	$	(7	)	$	—	$	—		$	9,895	$	(7	)
SBA pools	34,287		(296		)	4,186		(9		)	38,473		(305		)
Agency MBS	128,717		(889		)	17,935		(226		)	146,652		(1,115		)
Municipal bonds	1,671		(3		)	—		—			1,671		(3		)
Corporates	24,140		(398		)	—		—			24,140		(398		)
Non-agency MBS	61,284		(637		)	21,558		(823		)	82,842		(1,460		)
Other ABS	37,527		(146		)	4,708		(708		)	42,235		(854		)
Equity securities	1,859		(491		)	—		—			1,859		(491		)
Total	$	299,380	$	(2,867	)	$	48,387	$	(1,766	)	$	347,767	$	(4,633	)
Held to maturity securities:
Agency MBS	$	—	$	—		$	5,856	$	(107	)	$	5,856	$	(107	)
Municipal bonds	10,657		(116		)	12,688		(329		)	23,345		(445		)
Corporates	40,959		(1,846		)	6,420		(1,855		)	47,379		(3,701		)
Total	$	51,616	$	(1,962	)	$	24,964	$	(2,291	)	$	76,580	$	(4,253	)

Investments Classified by Contractual Maturity Date [Table Text Block]

The amortized cost of debt securities at June 30, 2015, by contractual maturity, is shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in thousands)	June 30, 2015
	Total Amortized Cost		Less than One Year Amortized Cost		After One Year to Five Years Amortized Cost		After Five Years to Ten Years Amortized Cost		After Ten Years Amortized Cost
Available for sale securities:
Contractual maturity
U.S. treasuries	$	159,264	$	—	$	159,264	$	—	$	—
Agency direct obligations	30,323		20,272		10,051		—		—
SBA pools	162,014		—		4,136		82,765		75,113
Agency MBS	666,405		—		2,398		29,622		634,385
Municipal bonds	97,417		—		—		15,185		82,232
Corporates	117,397		13,928		41,843		12,954		48,672
Non-agency MBS	185,662		—		701		7,417		177,544
Other ABS	107,495		3,516		36,755		26,387		40,837
Total	$	1,525,977	$	37,716	$	255,148	$	174,330	$	1,058,783
Held to maturity securities:
Contractual maturity
Agency MBS	$	102,368	$	—	$	—	$	—	$	102,368
Municipal bonds	230,582		—		—		18,295		212,287
Corporates	59,922		—		—		—		59,922
Total	$	392,872	$	—	$	—	$	18,295	$	374,577

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Organization and Basis of Presentation (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Mar. 01, 2015	Dec. 31, 2014 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Conversion ratio of stock, business combination					0.5997
Business combination, estimated transaction value	$ 867,000		$ 867,000
Merger-related expenses	792	$ 0	1,004	$ 0
Income from Equity Method Investment	100	700	100	700
Fair value of Equity Method Investments	1,600		1,600			$ 1,500
Gain on Transfer of Management Contract		$ 500		$ 500
Restricted Cash and Cash Equivalents	$ 24,200		$ 24,200			$ 19,800

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Loans and Allowance for Loan Losses Schedule of Troubled Debt Restructurings (Details) - Jun. 30, 2015 $ in Thousands	USD ($)	USD ($)
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 3,343	$ 3,343
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,343	$ 3,343
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 600	$ 966
Commercial loans [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 3,343	$ 3,343
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,343	$ 3,343
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	2
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 600	$ 966
Commercial loans [Member] | Technology [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 366
Commercial loans [Member] | Life sciences [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	0	0
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 0	$ 0
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	1	1
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 600	$ 600
Commercial loans [Member] | Other [Member]
Financing Receivable, Modifications [Line Items]
Financing Receivable, Modifications, Number of Contracts	1	1
Financing Receivable, Modifications, Pre-Modification Recorded Investment	$ 3,343	$ 3,343
Financing Receivable, Modifications, Post-Modification Recorded Investment	$ 3,343	$ 3,343
Financing Receivable, Modifications, Subsequent Default, Number of Contracts	0	0
Financing Receivable, Modifications, Subsequent Default, Recorded Investment	$ 0	$ 0

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Fair Value of Financial Assets and Liabilities Summary of Level 3 Valuation Techniques (Details) - USD ($) $ in Thousands		6 Months Ended		12 Months Ended
		Jun. 30, 2015		Dec. 31, 2014
Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		$ 1,541,342		$ 1,294,533
Warrants		5,125		4,304
Servicing asset		1,450		1,222
Venture capital fund investments		4,232		3,704
Recurring [Member] | US Treasury Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		159,501		29,641
Recurring [Member] | Agency direct obligations [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		30,435		30,631
Recurring [Member] | SBA pools [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		164,574		179,822
Recurring [Member] | Agency MBS [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		674,285		614,922
Recurring [Member] | Municipal bonds [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		98,931		98,490
Recurring [Member] | Corporates [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		120,625		118,359
Recurring [Member] | Non-agency MBS [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		185,113		173,099
Recurring [Member] | Other ABS [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		106,974		47,621
Recurring [Member] | Equity securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		904		1,948
Recurring [Member] | Level 3 [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		295,098		220,720
Warrants	[1]	5,125		4,304
Servicing asset	[2]	1,450		1,222
Venture capital fund investments	[3]	4,232		3,704
Recurring [Member] | Level 3 [Member] | US Treasury Securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Agency direct obligations [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | SBA pools [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Agency MBS [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Municipal bonds [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		0		0
Recurring [Member] | Level 3 [Member] | Corporates [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		3,011	[2]	0
Recurring [Member] | Level 3 [Member] | Non-agency MBS [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities	[2]	185,113		173,099
Recurring [Member] | Level 3 [Member] | Other ABS [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities	[2]	106,974		47,621
Recurring [Member] | Level 3 [Member] | Equity securities [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Available for sale securities		$ 0		$ 0
Minimum [Member] | Warrant [Member] | Level 3 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Weighted Average Volatility Rate	[1]	19.50%		20.20%
Risk Free Interest Rate	[1]	0.60%		1.20%
Remaining life assumption	[1]	21.80%		54.00%
Maximum [Member] | Warrant [Member] | Level 3 [Member]
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]
Weighted Average Volatility Rate	[1]	127.20%		67.00%
Risk Free Interest Rate	[1]	1.20%		1.50%
Remaining life assumption	[1]	50.80%		89.40%

[1] Low end of range relates to private equity warrant assets portfolio and high end of range relates to public equity warrant assets portfolio.

[2] The Company uses third-party pricing information without adjustment for this Level 3 fair value measurement.

[3] The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

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Interim Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Assets
Cash and due from banks	$ 39,579	$ 13,650
Interest-bearing deposits in other banks	347,768	72,292
Total cash and cash equivalents	387,347	85,942
Investment in time deposits	1,002	1,251
Investment securities—available for sale, at fair value	1,541,342	1,294,533
Investment securities—held to maturity, at amortized cost	392,872	300,425
Loans, net of unearned income of $8.8 million and $7.9 million	1,516,032	1,346,449
Less allowance for loan losses	(25,037)	(22,906)
Net loans	1,490,995	1,323,543
Premises and equipment, net	4,015	4,026
Deferred income tax assets, net	10,666	9,672
Bank owned life insurance	51,582	50,723
Intangible assets	1,745	1,615
Other receivables	3,500	3,226
Warrant valuation	5,125	4,304
Prepaid expenses	1,779	2,063
Accrued interest receivable and other assets	20,533	13,543
Total assets	3,912,503	3,094,866
Deposits:
Demand, noninterest-bearing	2,372,673	1,851,004
Demand, interest-bearing	100,496	71,598
Money market deposit accounts	1,081,211	837,630
Time deposits	9,384	16,320
Total deposits	3,563,764	2,776,552
Accrued interest payable and other liabilities	22,093	15,610
Total liabilities	$ 3,585,857	$ 2,792,162
Commitments and contingencies (Notes 11 and 16)
Shareholders’ equity:
Additional paid in capital	$ 256,382	$ 251,597
Accumulated other comprehensive income	8,479	7,404
Retained earnings	61,486	43,414
Total shareholders’ equity	326,646	302,704
Total liabilities and shareholders’ equity	3,912,503	3,094,866
Common Class A [Member]
Shareholders’ equity:
Common stock, $.01 par value; 70,000,000 and 45,000,000 shares authorized, 26,485,682 shares and 25,487,568 shares of Class A common stock issued and outstanding, respectively, and 3,395,110 shares of Class B common stock issued and outstanding	265	255
Common Class B [Member]
Shareholders’ equity:
Common stock, $.01 par value; 70,000,000 and 45,000,000 shares authorized, 26,485,682 shares and 25,487,568 shares of Class A common stock issued and outstanding, respectively, and 3,395,110 shares of Class B common stock issued and outstanding	$ 34	$ 34

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Investment Securities Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Investments [Line Items]
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value		$ 335,500	$ 285,700
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions		52	78
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year		24	24
Other Short-term Investments		$ 1,002	$ 1,251
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Period Increase (Decrease)	$ 43
Equity Securities from Warrant Exercises [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Fair Value		100	900
Other Security Investments [Member]
Schedule of Investments [Line Items]
Available-for-sale securities, Fair Value		$ 800	$ 1,000

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Interim Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Total	Additional Paid in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained (Deficit) Earnings [Member]	Preferred Stock [Member]	Common Class A [Member] Common Stock [Member]	Common Class B [Member] Common Stock [Member]
Balance at Dec. 31, 2013	$ 189,150	$ 183,716	$ (4,096)	$ 9,294	$ 0	$ 197	$ 39
Balance preferred shares at Dec. 31, 2013					5,000
Balance common shares at Dec. 31, 2013						19,699,136	3,912,610
Issuance of common stock (shares)						3,786,810	0
Issuance of common stock (value), net of issuance costs	59,569	59,531				$ 38	$ 0
Stock-based compensation	1,707	1,707
Conversion of stock, shares converted					(5,000)
Common shares issued upon conversion of preferred stock						500,070
Conversion of preferred stock, value	1	(4)				$ 5
Conversion of trust preferred securities, common shares issued						741,500
Debt Conversion, Converted Instrument, Amount						$ 7
Conversion of trust preferred securities, adjustment to additional paid in capital		6,023
Stock Issued During Period, Value, Conversion of Convertible Securities, Net of Adjustments	6,030
Dividends on preferred stock	(63)			(63)
Net income	15,899			15,899
Unrealized gain on securities net of tax	11,404		11,404
Balance at Jun. 30, 2014	283,697	250,973	7,308	25,130	$ 0	$ 247	$ 39
Balance preferred shares at Jun. 30, 2014					0
Balance common shares at Jun. 30, 2014						24,727,516	3,912,610
Balance at Dec. 31, 2014	302,704	251,597	7,404	43,414	$ 0	$ 255	$ 34
Balance preferred shares at Dec. 31, 2014					0
Balance common shares at Dec. 31, 2014						25,487,568	3,395,110
Issuance of common stock (shares)						998,114	0
Issuance of common stock (value), net of issuance costs	2,574	2,564				$ 10	$ 0
Stock-based compensation	2,221	2,221
Net income	18,072			18,072
Unrealized gain on securities net of tax	1,075		1,075
Balance at Jun. 30, 2015	$ 326,646	$ 256,382	$ 8,479	$ 61,486	$ 0	$ 265	$ 34
Balance preferred shares at Jun. 30, 2015					0
Balance common shares at Jun. 30, 2015						26,485,682	3,395,110

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Borrowings (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2014	Jun. 30, 2015	Sep. 30, 2008
Subordinated Borrowings [Abstract]
Trust preferred securities, original amount				$ 7,400
Subordinated debentures original amount				7,600
Subordinated debentures, original unamortized discount				$ 1,500
Convertible trust preferred securities, conversion price per share	$ 10.00
Convertible Trust Preferred Securities Converted to Other Securities	$ 3,700	$ 7,400
Interest Expense, Trust Preferred Securities	$ 56	$ 215
Unsecured Debt [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity			$ 60,000
Federal Reserve Bank Advances [Member] | Secured Debt [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity			83,400
Federal Home Loan Bank Advances [Member] | Secured Debt [Member]
Line of Credit Facility [Line Items]
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available			$ 250,400
Common Stock [Member]
Subordinated Borrowings [Abstract]
Conversion of trust preferred securities, common shares issued	366,500	741,500

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Equity (Tables)

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

Basic and diluted earnings per common share are calculated as follows:

(in thousands except per share data)		Three Months Ended   June 30,				Six Months Ended   June 30,
		2015		2014		2015		2014
Basic:
Net income		$	9,919	$	8,051	$	18,072	$	15,899
Less:	dividends on preferred stock	—		1		—		63
Net income attributable to common shares		9,919		8,050		18,072		15,836
Basic weighted-average common shares outstanding		29,825		28,333		29,549		26,042
Earnings per share—basic		$	0.33	$	0.28	$	0.61	$	0.61
Diluted:
Net income attributable to common shares		$	9,919	$	8,050	$	18,072	$	15,836
Plus:	dividends on preferred stock	—		1		—		63
	convertible trust preferred securities	—		39		—		148
Net income attributable to common shares after assumed conversions		9,919		8,090		18,072		16,047
Basic weighted-average common shares outstanding		29,825		28,333		29,549		26,042
Effect of dilutive stock options and warrants		670		1,331		842		1,711
Diluted weighted-average common shares outstanding		30,495		29,664		30,391		27,753
Earnings per share—diluted		$	0.33	$	0.27	$	0.60	$	0.58

Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]

Reclassification adjustments out of accumulated other comprehensive income for the three and six months ended June 30,2015 and 2014 are presented in the following table:

(in thousands)		Three Months Ended June 30,						Six Months Ended   June 30,
	Location	2015			2014			2015			2014
Reclassification adjustment for gains included in net income	Net gain (loss) on securities	$	(1,396	)	$	(80	)	$	(1,021	)	$	(80	)
Related tax expense	Income tax expense	523			30			383			30
Reclassification adjustment for gains included in net income, net of tax		$	(873	)	$	(50	)	$	(638	)	$	(50	)

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Retirement Plan (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Cost Recognized	$ 0.3	$ 0.2	$ 0.7	$ 0.6
First 3% of Employee Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			100.00%
3-5% Employee Contribution [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match			50.00%

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Derivatives

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

DERIVATIVES

The Company receives equity warrants with net settlement terms in connection with extending loan commitments to certain of its customers. These warrants are obtained at the inception of a loan facility or the amendment of a loan facility. These warrants are not obtained in lieu of other fees, interest or payments. These warrants potentially provide an additional return, in addition to the traditional loan yield from interest and fees, in the event of a liquidity event of the borrowing company. The Company holds these equity warrants for future investment gains, rather than to hedge economic risks. In general, the equity warrants entitle the Company to buy a specific number of shares of the customer’s stock at a specific price over a specific time period. The warrants may also include contingent provisions which provide for additional shares to be purchased at a specific price if defined future events occur, such as future rounds of equity financing by the customer, or upon additional borrowings by the customer. All of the Company’s equity warrants contain net share settlement provisions, which permit the customer to deliver to the Company, upon the Company’s exercise of the warrant, the amount of shares with a current fair value equal to the net gain under the warrant agreement.

ASC 815 Derivatives and Hedging requires that all derivative instruments be recorded on the balance sheet at fair value. Equity warrants with net share settlement provisions are considered derivatives. The Company's equity warrants portfolio is primarily comprised of holdings in non-public companies and the Company’s practice generally is to monetize its positions as soon as a liquidity event occurs. Often there is a lock-up period requiring the Company to hold its equity position in a publicly traded security until the expiration of the lock-up period. The Company estimates the initial fair value of non-public company equity warrants using a Black-Scholes option pricing model to approximate fair market value. The model estimates market value for each warrant based on the most recent equity offering at the time of issuance, the warrant specific exercise price, the warrant’s expected life, a risk-free interest rate based on a duration matched U.S. Treasury rate and volatility factors derived from indices of comparable publicly traded companies. On a monthly basis, the Company adjusts the value of equity warrants in non-public companies using a Black-Scholes model to approximate fair market value based on changes to the risk-free interest rate, the volatility rate and the warrant’s expected life.

The Company also holds warrants in public companies. When a private company goes public there is often a lock-up period requiring the Company to hold its equity position in a publicly traded security until the expiration of the lock-up period. The Company adjusts the value of equity warrants in public companies on a monthly basis based on the month-end closing stock price adjusted for the option value of the warrant. The model estimates market value for each warrant based on the share price as of the evaluation date, the warrant specific exercise price, the warrant’s expected life, a risk-free interest rate based on a duration matched U.S. Treasury rate and uses a company specific volatility factor. See Note 15 for further information regarding the fair value of the Company's equity warrants. Any changes from the grant date in the fair value of equity warrant assets will be recognized as increases or decreases to warrant valuation and as unrealized gains or losses in non-interest income. When a portfolio company completes an initial public offering on a publicly reported market or is acquired, the Company may exercise these equity warrant assets for shares or cash. Shares received from the exercise of warrants and subject to lock-up agreements are held as equity securities in the Company's available for sale portfolio.

The grant date fair values of equity warrants received in connection with extending loan commitments are considered to be loan fees and are recognized over the life of the loan commitment as an adjustment to loan yield through loan interest income. At June 30, 2015 and December 31, 2014, unearned income on loans included $2.2 million and $2.0 million, respectively, related to the initial valuation of equity warrant assets. For the three and six months ended June 30,2015, the Company recognized $0.6 million and $1.0 million, respectively, in income from the amortization of loan fees related to the initial valuation of equity warrant assets. For the three and six months ended June 30,2014, the Company recognized $0.3 million and $0.6 million, respectively, in income from the amortization of loan fees related to the initial valuation of equity warrant assets.

Warrants held, which amounted to $5.1 million and $4.3 million in 484 and 461 companies at June 30, 2015 and December 31, 2014, respectively, are shown as warrant valuation in the accompanying consolidated balance sheets. At June 30, 2015, included in the $5.1 million in equity warrant assets in 484 companies are $0.6 million of equity warrant assets held in nine publicly traded companies. At December 31, 2014, included in the $4.3 million in equity warrant assets in 461 companies are $0.2 million of equity warrant assets held in six publicly traded companies.

During the three months ended June 30,2015, the Company did not exercise any warrants for equity securities. During the three months ended June 30,2015, the Company monetized equity securities for $0.1 million in proceeds following the expiration of their applicable lock-up periods. These equity securities had an initial value of $0.1 million. The Company had obtained these equity securities through the exercise of warrants in two public companies.

During the six months ended June 30,2015, the Company exercised warrants with a total value of $33 thousand and received equity securities in one publicly traded company. During the six months ended June 30,2015, the Company monetized equity securities for $0.9 million in proceeds following the expiration of their applicable lock-up periods. These equity securities had an initial value of $1.2 million and the Company recognized a loss of $0.3 million. The Company had obtained these equity securities through the exercise of warrants in four public companies.

During the three and six months ended June 30,2014, the Company exercised warrants with a total value of $1.4 million and received equity securities in four publicly traded companies of which one was monetized for $0.3 million. During the three and six months ended June 30,2014, the Company exited $0.8 million in warrants in one publicly traded company and $0.8 million in warrants in warrants in three publicly traded companies, respectively.

At June 30, 2015 and December 31, 2014, the fair value of equity securities included in investments obtained through the exercise of warrants and still held was $0.1 million and $0.9 million, respectively (see Note 3).

The following table presents gains and losses on equity warrant exercises and the number of companies on which warrants were exercised, broken out by stage of emerging companies:

(in thousands except number of companies)	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Equity warrant assets:
Gains:
Early stage	$	60		$	889		$	206		$	1,030
Expansion stage	90			1,144			197			1,534
Late stage	10			127			496			454
Total gains on exercise of equity warrant assets	160			2,160			899			3,018
Losses:
Expansion stage	—			(2		)	—			(2		)
Late stage	(4		)	—			(4		)	—
Total losses on exercise of equity warrant assets (1)	(4		)	(2		)	(4		)	(2		)
Net gains on exercise of equity warrant assets	156			2,158			895			3,016
Non-monetized write off of warrant assets	(66		)	(97		)	(125		)	(176		)
Net realized gains on equity warrants	90			2,061			770			2,840
Change in fair value of equity warrant assets	149			(2,040		)	(69		)	(624		)
Warrant income	$	239		$	21		$	701		$	2,216
Number of companies on which warrant gains were realized:
Early stage	4			6			9			11
Expansion stage	8			12			14			17
Late stage	1			2			6			5
Total number of companies	13			20			29			33

(1) Realized warrant losses for the three and six months ended June 30,2015 related to one late stage company. Realized warrant losses for the three and six months ended June 30,2014 related to one expansion stage company.

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Regulatory Matters and Restrictions (Tables)

6 Months Ended

Jun. 30, 2015

Regulatory Capital Requirements [Abstract]

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

The Company’s actual capital amounts and ratios at June 30, 2015 and December 31, 2014, and the minimum capital requirements, are presented in the following table:

(dollars in thousands)
	Minimum Requirements to be:
COMPANY	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital ratio	$	344,658	13.12	%	$	210,097	8.00	%	$	262,621	10.00	%
Tier 1 risk-based capital ratio	317,608		12.09		157,572		6.00		210,097		8.00
Common equity Tier 1 capital ratio	317,608		12.09		118,179		4.50		170,703		6.50
Tier 1 leverage ratio	317,608		9.07		140,118		4.00		175,148		5.00
December 31, 2014
Total risk-based capital ratio	$	318,344	14.95	%	$	170,340	8.00	%	$	212,925	10.00	%
Tier 1 risk-based capital ratio	294,441		13.83		85,170		4.00		127,755		6.00
Tier 1 leverage ratio	294,441		9.71		121,289		4.00		151,611		5.00

The Bank’s actual capital amounts and ratios at June 30, 2015 and December 31, 2014, and the minimum capital requirements, are presented in the following table:

(dollars in thousands)
	Minimum Requirements to be:
BANK	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital ratio	$	335,229	12.82	%	$	209,186	8.00	%	$	261,483	10.00	%
Tier 1 risk-based capital ratio	308,179		11.79		156,890		6.00		209,186		8.00
Common equity Tier 1 capital ratio	308,179		11.79		117,667		4.50		169,964		6.50
Tier 1 leverage ratio	308,179		8.82		139,787		4.00		174,733		5.00
December 31, 2014
Total risk-based capital ratio	$	309,928	14.61	%	$	169,752	8.00	%	$	212,190	10.00	%
Tier 1 risk-based capital ratio	286,025		13.48		84,876		4.00		127,314		6.00
Tier 1 leverage ratio	286,025		9.44		121,186		4.00		151,483		5.00

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Off-balance Sheet Risk, Commitments & Contingencies

6 Months Ended

Jun. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Off-balance Sheet Risk, Commitments and Contingencies

OFF-BALANCE SHEET RISK, COMMITMENTS AND CONTINGENCIES

To meet the financial needs of its customers, the Company is party to financial instruments with off-balance sheet risk in the normal course of business. These financial instruments are comprised of unfunded lines of credit and financial standby letters of credit. These instruments involve, to varying degrees, elements of credit risk in excess of the amounts recognized in the accompanying consolidated balance sheet.

The Company’s exposure to credit loss in the event of nonperformance by the other party is represented by the contractual amount of these instruments. The Company uses the same credit policies in making these commitments as it does for on-balance sheet instruments. The amount of collateral obtained, if deemed necessary by the Company upon extension of credit, is based on management’s credit evaluation of the borrower. Collateral held varies but may include cash in deposit accounts, trade accounts receivable, property, plant, and equipment and intellectual property. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.

At June 30, 2015 and December 31, 2014, unfunded lines of credit were $1.4 billion and $1.2 billion, respectively, and outstanding standby letters of credit amounted to $78.5 million and $68.4 million, respectively.

Three putative stockholder class action lawsuits were filed in connection with the previously disclosed proposed merger between us and PacWest (see Note 1). Manganaro v. Burke et al., Case No. 10817-VCL,  was filed in the Court of Chancery of the State of Delaware on March 20, 2015, and was voluntarily dismissed without prejudice on May 5, 2015. Lakowitz v. Bowers et al., Case No. 1:15-CV-371, was filed in the federal district court for the Middle District of North Carolina on May 6, 2015 and was voluntarily dismissed without prejudice on May 7, 2015. 

Li v. Bowers et al., Case No. 1:15-CV-373 (the “Li Action”), was filed in federal district court for the Middle District of North Carolina on May 7, 2015. The Li Action alleged that the members of the Square 1 board of directors breached their fiduciary duties to Square 1 stockholders and failed to take steps to maximize the value to be paid to the Square 1 stockholders. In addition, the Li Action alleged that PacWest aided and abetted these alleged breaches of fiduciary duties. The Li Action also alleged violations of federal securities laws with respect to allegedly misleading statements contained in the registration statement filed with the SEC in connection with the merger. The plaintiffs in the Li Action sought, among other things, declaratory and injunctive relief, attorneys’ fees and costs, and other and further relief. 

On June 1, 2015, the parties to the Li Action entered into a Memorandum of Understanding which sets forth the parties’ agreement in principle to a settlement of that action. In connection with the settlement of the Li Action, Square 1 and PacWest agreed to make certain additional disclosures, which were contained in the definitive proxy statement and prospectus filed with the SEC with respect to the merger. The settlement remains subject to a number of conditions, including, among other things, final documentation and court approval following notice to the settlement class. There can be no assurance that the settlement will ultimately be approved by the court.

 From time to time, the Company is party, either as a defendant or plaintiff, to other lawsuits in the normal course of its business. While any litigation involves an element of uncertainty, management is of the opinion that the liability, if any, resulting from these other pending legal proceedings in the normal course of business will not have a material adverse effect on our financial condition, liquidity or results of operations.

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Stock-based Compensation Plan Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of shares authorized under the 2009 Stock Incentive Plan, as amended	2,820,542		2,820,542
Number of shares available for future issuance under the 2009 Stock Incentive Plan, as amended	932,818		932,818
Grant expiration period from date of grant under the 2009 Stock Incentive Plan, as amended			7 years
Grant vesting period from date of grant under the 2009 Stock Incentive Plan, as amended			5 years
Allocated Share-based Compensation Expense	$ 0.9	$ 0.7	$ 2.2	$ 1.7
Unrecognized compensation cost related to non-vested stock-based compensation under 2009 Stock Incentive Plan, as amended	$ 4.2		$ 4.2
Period for recognition of unrecognized compensation cost for 2009 Stock Incentive Plan, as amended			5 years

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Interim Consolidated Statements of Shareholders' Equity Parenthetical (Parentheticals) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Unrealized gain (loss) on securities, net of tax - TAX AMOUNT	$ 700	$ 3,200
Issuance of common stock, net of issuance costs - ISSUANCE COSTS		$ 2,300

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Interim Consolidated Balance Sheets Parenthetical (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Unearned income on loans	$ (8,810)	$ (7,887)
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	70,000,000	45,000,000
Common Class A [Member]
Common stock, par value	$ 0.01	$ 0.01
Common Class B [Member]
Common stock, par value	$ 0.01	$ 0.01
Common Stock [Member] | Common Class A [Member]
Common Stock, Shares Issued and Outstanding	26,485,682	25,487,568
Common Stock [Member] | Common Class B [Member]
Common Stock, Shares Issued and Outstanding	3,395,110	3,395,110

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Equity

6 Months Ended

Jun. 30, 2015

Equity [Abstract]

Equity

EQUITY

Preferred Stock

In December 2008, the Company issued 5,000 shares of Series A, 5% Fixed Rate Cumulative Convertible Preferred Stock. Dividends were paid quarterly, in arrears. The preferred stock was convertible into shares of the Company’s common stock at the option of the holder and had a conversion price of $10.00 per share. On April 2, 2014, all shares of preferred stock were converted by the holder into 500,070 shares of common stock.

Issuances of Common Stock

During the three months ended June 30,2015 and 2014, the Company issued 3,139 shares and 2,290 shares, respectively, of common stock related to vesting of restricted stock units issued under the Company's stock-based incentive compensation plan, and issued 93,925 shares and 78,600 shares, respectively, of common stock related to the exercise of stock options issued under the stock-based incentive compensation plan. During the six months ended June 30,2015 and 2014, the Company issued 49,600 shares and 42,330 shares, respectively, of common stock related to vesting of restricted stock units issued under the Company's stock-based incentive compensation plan, and issued 319,078 shares and 118,730 shares, respectively, of common stock related to the exercise of stock options issued under the stock-based incentive compensation plan.

In 2005, the Company's organizers received warrants to purchase one additional share of common stock for every share of common stock purchased. These warrants expire 10 years after issuance. At June 30, 2015 and December 31, 2014, there were 4,000 warrants and 30,000 warrants outstanding, respectively, with an exercise price of $10.00 per share. During the three and six months ended June 30,2015, the Company issued 26,000 shares of common stock related to the exercise of a portion of the outstanding warrants. During the three and six months ended June 30,2014, the Company issued 28,000 shares and 32,000 shares of common stock related to the exercise of a portion of the outstanding warrants.

On March 31, 2014, the Company sold a total of 3,125,000 shares of Class A common stock in its initial public offering at an initial public offering price of $18.00 and received net proceeds of $51.1 million after expenses. On April 1, 2014, the underwriters exercised in full the underwriters’ purchase option granted in connection with the initial public offering, at the initial public offering price of $18.00, resulting in an additional 468,750 shares purchased from the Company for which it received $7.9 million in net proceeds on April 4, 2014.

During the three and six months ended June 30,2014, the Company issued shares of its Class A common stock in connection with the conversion of the outstanding convertible trust preferred securities into common shares (see Note 8).

In 2010, in connection with a private placement of Company common stock, the Company issued warrants to purchase 750,000 shares of common stock at any time. The exercise price of the warrants was $5.15 per share. In February 2015, all of the warrants were net exercised for 603,436 shares of common stock. These warrants were originally valued at $1.8 million using a Black-Scholes-Merton fair value model and are included in additional paid in capital in the accompanying consolidated balance sheet at December 31, 2014.

Earnings Per Share

Basic and diluted earnings per share are computed based on the weighted average number of shares outstanding during each period. Diluted earnings per share reflects the potential dilution that could occur if convertible preferred stock, convertible trust preferred securities, stock options or warrants were exercised, resulting in the issuance of common stock that then shared in the net income of the Company.

Basic and diluted earnings per common share are calculated as follows:

(in thousands except per share data)		Three Months Ended   June 30,				Six Months Ended   June 30,
		2015		2014		2015		2014
Basic:
Net income		$	9,919	$	8,051	$	18,072	$	15,899
Less:	dividends on preferred stock	—		1		—		63
Net income attributable to common shares		9,919		8,050		18,072		15,836
Basic weighted-average common shares outstanding		29,825		28,333		29,549		26,042
Earnings per share—basic		$	0.33	$	0.28	$	0.61	$	0.61
Diluted:
Net income attributable to common shares		$	9,919	$	8,050	$	18,072	$	15,836
Plus:	dividends on preferred stock	—		1		—		63
	convertible trust preferred securities	—		39		—		148
Net income attributable to common shares after assumed conversions		9,919		8,090		18,072		16,047
Basic weighted-average common shares outstanding		29,825		28,333		29,549		26,042
Effect of dilutive stock options and warrants		670		1,331		842		1,711
Diluted weighted-average common shares outstanding		30,495		29,664		30,391		27,753
Earnings per share—diluted		$	0.33	$	0.27	$	0.60	$	0.58

Accumulated Other Comprehensive Income (Loss)

The Company’s only components of accumulated other comprehensive income (loss) relate to unrealized gains and losses on available for sale securities and their related tax effects. Reclassification adjustments out of accumulated other comprehensive income for the three and six months ended June 30,2015 and 2014 are presented in the following table:

(in thousands)		Three Months Ended June 30,						Six Months Ended   June 30,
	Location	2015			2014			2015			2014
Reclassification adjustment for gains included in net income	Net gain (loss) on securities	$	(1,396	)	$	(80	)	$	(1,021	)	$	(80	)
Related tax expense	Income tax expense	523			30			383			30
Reclassification adjustment for gains included in net income, net of tax		$	(873	)	$	(50	)	$	(638	)	$	(50	)

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Document and Entity Information Document - shares	6 Months Ended
	Jun. 30, 2015	Jul. 31, 2015
Entity Information [Line Items]
Entity Registrant Name	Square 1 Financial Inc
Entity Central Index Key	0001329799
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		29,913,520

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Income Taxes

6 Months Ended

Jun. 30, 2015

Income Tax Disclosure [Abstract]

Income Taxes

INCOME TAXES

The Company and its subsidiaries file a consolidated U.S. federal income tax return. The Company is no longer subject to the assessment of tax with respect to returns that have been filed for years prior to 2009. The Company's effective tax rate is lower than the federal statutory rate primarily as a result of the Company's portion of income from non-taxable investments.

Realization of the Company’s net deferred tax assets is dependent upon the Company generating sufficient taxable income in future years to obtain a benefit from the reversal of deductible temporary differences and from tax loss carry-forwards. The Company has concluded that, based on expected future results and the future reversals of existing taxable temporary differences, it is more likely than not that its deferred tax assets will be realized, except for a $0.3 million valuation allowance for North Carolina. The Company’s net operating loss carry-forwards will begin to expire in 2029.

The Company recognizes the financial statement benefit of a tax position only after determining that the relevant tax authority would more-likely-than-not sustain the position following an audit. For tax positions meeting the more-likely-than-not threshold, the amount recognized in the financial statements is the largest benefit that has a greater than 50% likelihood of being realized upon ultimate settlement with the relevant tax authority. At June 30, 2015 and December 31, 2014, the Company did not record a liability for uncertain tax positions because no material positions existed.

The Company classifies tax related interest and penalties as a component of income taxes. Interest and penalties for all periods presented were immaterial.

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Interim Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Interest income:
Loans including fees on loans	$ 22,207	$ 17,720	$ 42,341	$ 34,123
Investment securities:
Taxable	6,795	5,382	13,693	9,943
Non-taxable	2,463	1,836	4,792	3,608
Federal funds and other short-term investments	128	137	168	201
Total interest income	31,593	25,075	60,994	47,875
Interest expense:
Deposits	193	143	404	273
Borrowings and repurchase agreements	1	0	46	4
Junior subordinated debt	0	56	0	215
Total interest expense	194	199	450	492
Net interest income	31,399	24,876	60,544	47,383
Provision for loan losses	3,758	3,150	9,205	6,114
Net interest income after provision for loan losses	27,641	21,726	51,339	41,269
Noninterest income:
Service charges and fees	1,325	1,126	2,583	2,194
Foreign exchange fees	1,620	1,363	3,338	3,004
Credit card and merchant income	1,100	765	2,121	1,401
Investment impairment	0	0	0	(43)
Net gain on securities	1,025	38	821	47
Letter of credit fees	455	297	697	812
Warrant income	239	21	701	2,216
Gain on sale of loans	592	249	1,398	502
Bank owned life insurance	424	317	859	607
Other	852	2,196	1,326	2,771
Total noninterest income	7,632	6,372	13,844	13,511
Noninterest expense:
Personnel	12,541	10,725	24,768	21,359
Occupancy	880	773	1,703	1,513
Data processing	1,049	918	1,986	1,740
Furniture and equipment	793	660	1,558	1,362
Advertising and promotions	383	342	624	617
Professional fees	1,089	786	1,901	1,387
Telecommunications	286	285	577	545
Travel	285	292	482	458
FDIC assessment	497	347	916	752
Merger-related expenses	792	0	1,004	0
Other	1,712	1,472	3,125	2,450
Total noninterest expense	20,307	16,600	38,644	32,183
Income before income tax expense	14,966	11,498	26,539	22,597
Income tax expense	5,047	3,447	8,467	6,698
Net income	9,919	8,051	18,072	15,899
Dividends on preferred stock	0	1	0	63
Net income available to common shareholders	$ 9,919	$ 8,050	$ 18,072	$ 15,836
Earnings per share—basic	$ 0.33	$ 0.28	$ 0.61	$ 0.61
Earnings per share—diluted	$ 0.33	$ 0.27	$ 0.60	$ 0.58

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Loans and Allowance for Loan Losses

6 Months Ended

Jun. 30, 2015

Receivables [Abstract]

Loans and Allowance for Loan Losses

LOANS AND ALLOWANCE FOR LOAN LOSSES

Loans

The composition of loans, net of unearned income, broken out by portfolio segment at June 30, 2015 and December 31, 2014, are as follows:

(in thousands)	June 30, 2015			December 31, 2014
Commercial loans:
Technology	$	739,016		$	631,979
Life sciences	307,240			274,057
Asset-based loans	143,204			177,701
Venture capital/private equity	216,268			169,143
SBA and USDA	36,926			35,609
Other	14,062			6,854
Total commercial loans	1,456,716			1,295,343
Real estate loans:
SBA and USDA	37,995			36,978
Total real estate loans	37,995			36,978
Construction loans:
SBA and USDA	6,752			4,035
Total construction loans	6,752			4,035
Credit cards	23,379			17,980
Less unearned income, net	(8,810		)	(7,887		)
Total loans, net of unearned income	$	1,516,032		$	1,346,449

The Bank makes loans under the Small Business Administration (SBA) and United States Department of Agriculture (USDA) programs. At June 30, 2015 and December 31, 2014, the outstanding balances of these loans being serviced were $142.5 million and $135.3 million, respectively. The SBA/USDA guaranteed portions of five and seven of these loans were sold to the secondary market during the six months ended June 30,2015 and 2014, respectively. The cumulative outstanding sold balance at June 30, 2015 and December 31, 2014, was $57.5 million and $57.2 million, respectively.

The Company accounts for loan servicing rights or liabilities under Accounting Standards Codification (ASC) 860, “Transfers and Servicing.” ASC 860 requires the Company to recognize a servicing asset or servicing liability each time it undertakes an obligation to service a financial asset. Changes in the fair value of the servicing asset are recognized in other noninterest income. The valuation methodology estimates the present value of future cash flows based on the unique characteristics of the loan, market-based assumptions for prepayment speeds, and discount rate assumptions. The servicing asset is recorded in intangible assets in the financial statements.

See Note 15 for a summary of the activity for the Company's servicing assets.

Allowance for Loan Losses

The following tables summarize the activity in the allowance for loan losses during the three and six months ended June 30,2015 and 2014, broken out by portfolio segment:

(in thousands)	Three Months Ended June 30, 2015
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	12,714	$	1,630	$	6	$	3,369		$	14,459
Life sciences	4,581		600		—		(73		)	3,908
Asset-based loans	3,025		938		—		74			2,161
Venture capital/private equity	331		—		—		43			374
SBA and USDA	534		26		1		113			622
Other	2,474		246		—		291			2,519
Total commercial loans	23,659		3,440		7		3,817			24,043
Real estate loans:
SBA and USDA	826		27		—		(100		)	699
Total real estate loans	826		27		—		(100		)	699
Construction:
SBA and USDA	49		—		—		12			61
Total construction loans	49		—		—		12			61
Credit cards	205		—		—		29			234
Total loans	$	24,739	$	3,467	$	7	$	3,758		$	25,037

(in thousands)	Three Months Ended June 30, 2014
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	13,233	$	332	$	53	$	426		$	13,380
Life sciences	3,403		409		—		2,180			5,174
Asset-based loans	877		—		—		486			1,363
Venture capital/private equity	106		—		—		37			143
SBA and USDA	557		—		—		57			614
Other	9		—		—		2			11
Total commercial loans	18,185		741		53		3,188			20,685
Real estate loans:
SBA and USDA	703		—		—		(1		)	702
Total real estate loans	703		—		—		(1		)	702
Construction:
SBA and USDA	57		—		—		(38		)	19
Total construction loans	57		—		—		(38		)	19
Credit cards	149		—		—		1			150
Total loans	$	19,094	$	741	$	53	$	3,150		$	21,556

(in thousands)	Six Months Ended June 30, 2015
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	11,904	$	3,691	$	392	$	5,854		$	14,459
Life sciences	3,657		1,961		—		2,212			3,908
Asset based loans	3,364		938		—		(265		)	2,161
Venture capital/private equity	250		—		—		124			374
SBA and USDA	622		64		1		63			622
Other	1,576		246		—		1,189			2,519
Total commercial loans	21,373		6,900		393		9,177			24,043
Real estate loans:
SBA and USDA	1,310		567		—		(44		)	699
Total real estate loans	1,310		567		—		(44		)	699
Construction:
SBA and USDA	43		—		—		18			61
Total construction loans	43		—		—		18			61
Credit cards	180		—		—		54			234
Total loans	$	22,906	$	7,467	$	393	$	9,205		$	25,037

(in thousands)	Six Months Ended June 30, 2014
	Beginning Balance		Charge Offs		Recoveries		Provision (Benefit)			Ending Balance
Commercial loans
Technology	$	13,609	$	2,166	$	156	1,781			$	13,380
Life sciences	1,971		409		—		3,612			5,174
Asset based loans	684		—		—		679			1,363
Venture capital/private equity	197		—		—		(54		)	143
SBA and USDA	627		128		—		115			614
Other	2		—		—		9			11
Total commercial loans	17,090		2,703		156		6,142			20,685
Real estate loans:
SBA and USDA	1,163		390		—		(71		)	702
Total real estate loans	1,163		390		—		(71		)	702
Construction:
SBA and USDA	10		—		—		9			19
Total construction loans	10		—		—		9			19
Credit cards	116		—		—		34			150
Total loans	$	18,379	$	3,093	$	156	$	6,114		$	21,556

The following tables summarize the allowance for loan losses individually and collectively evaluated for impairment at June 30, 2015 and December 31, 2014, broken out by portfolio segment:

(in thousands)	June 30, 2015
	Ending Balance: Individually Evaluated for Impairment		Ending Balance: Collectively Evaluated for Impairment
Commercial loans
Technology	$	5,385	$	9,074
Life sciences	313		3,595
Asset based loans	—		2,161
Venture capital/private equity	—		374
SBA and USDA	—		622
Other	2,467		52
Total commercial loans	8,165		15,878
Real estate loans:
SBA and USDA	18		681
Total real estate loans	18		681
Construction:
SBA and USDA	—		61
Total construction loans	—		61
Credit cards	—		234
Total loans	$	8,183	$	16,854

(in thousands)	December 31, 2014
	Ending Balance: Individually Evaluated for Impairment		Ending Balance: Collectively Evaluated for Impairment
Commercial loans
Technology	$	4,523	$	7,381
Life sciences	1,181		2,476
Asset based loans	280		3,084
Venture capital/private equity	—		250
SBA and USDA	46		576
Other	1,564		12
Total commercial loans	7,594		13,779
Real estate loans:
SBA and USDA	510		800
Total real estate loans	510		800
Construction:
SBA and USDA	—		43
Total construction loans	—		43
Credit cards	—		180
Total loans	$	8,104	$	14,802

Credit Quality

The following table summarizes the aging of gross loans, broken out by portfolio segment, at June 30, 2015 and December 31, 2014. See Note 2 to the Consolidated Financial Statements in the Company's 2014 Form 10-K for a discussion of credit quality indicators.

(in thousands)	June 30, 2015
	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Loans Past Due		Current		Total Loans		Loans 90+ Days Past Due Still Accruing
Commercial loans:
Technology	$	2,381	$	2,289	$	1,200	$	5,870	$	733,146	$	739,016	$	—
Life sciences	—		—		—		—		307,240		307,240		—
Asset-based loans	—		—		—		—		143,204		143,204		—
Venture capital/private equity	—		—		—		—		216,268		216,268		—
SBA and USDA	—		—		539		539		36,387		36,926		—
Other	—		—		—		—		14,062		14,062		—
Total commercial loans	2,381		2,289		1,739		6,409		1,450,307		1,456,716		—
Real estate loans:
SBA and USDA	—		385		1,754		2,139		35,856		37,995		—
Total real estate loans	—		385		1,754		2,139		35,856		37,995		—
Construction loans:
SBA and USDA	—		—		—		—		6,752		6,752		—
Total construction loans	—		—		—		—		6,752		6,752		—
Credit cards	—		—		—		—		23,379		23,379		—
Total loans, gross	$	2,381	$	2,674	$	3,493	$	8,548	$	1,516,294	$	1,524,842	$	—

(in thousands)	December 31, 2014
	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Loans Past Due		Current		Total Loans		Loans 90+ Days Past Due Still Accruing
Commercial loans:
Technology	$	—	$	—	$	—	$	—	$	631,979	$	631,979	$	—
Life sciences	—		—		—		—		274,057		274,057		—
Asset-based loans	—		—		—		—		177,701		177,701		—
Venture capital/private equity	—		—		—		—		169,143		169,143		—
SBA and USDA	—		—		175		175		35,434		35,609		—
Other	3,245		—		—		3,245		3,609		6,854		—
Total commercial loans	3,245		—		175		3,420		1,291,923		1,295,343		—
Real estate loans:
SBA and USDA	—		—		408		408		36,570		36,978		—
Total real estate loans	—		—		408		408		36,570		36,978		—
Construction loans:
SBA and USDA	—		—		—		—		4,035		4,035		—
Total construction loans	—		—		—		—		4,035		4,035		—
Credit cards	—		—		—		—		17,980		17,980		—
Total loans, gross	$	3,245	$	—	$	583	$	3,828	$	1,350,508	$	1,354,336	$	—

The following tables summarize impaired loans as they relate to allowance for loan losses, broken out by portfolio segment, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Allowance for loan losses related to impaired loans		Impaired loans with related allowance for loan losses		Impaired loans with no related allowance for loan losses		Recorded investment in impaired loans		Total of unpaid principal of impaired loans
Commercial loans:
Technology	$	5,385	$	8,792	$	1,200	$	9,992	$	10,507
Life Sciences	313		1,911		—		1,911		1,976
SBA and USDA	—		—		539		539		611
Other	2,467		3,343		—		3,343		3,409
Total commercial loans	8,165		14,046		1,739		15,785		16,503
Real estate loans:
SBA and USDA	18		385		1,767		2,152		2,745
Total real estate loans	18		385		1,767		2,152		2,745
Total loans, gross	$	8,183	$	14,431	$	3,506	$	17,937	$	19,248

(in thousands)	December 31, 2014
	Allowance for loan losses related to impaired loans		Impaired loans with related allowance for loan losses		Impaired loans with no related allowance for loan losses		Recorded investment in impaired loans		Total of unpaid principal of impaired loans
Commercial loans:
Technology	$	4,523	$	8,757	$	730	$	9,487	$	10,398
Life Sciences	1,181		2,511		—		2,511		4,140
Asset-based loans	280		570		—		570		570
SBA and USDA	46		175		—		175		183
Other	1,564		3,245		—		3,245		3,261
Total commercial loans	7,594		15,258		730		15,988		18,552
Real estate loans:
SBA and USDA	510		1,251		—		1,251		1,261
Total real estate loans	510		1,251		—		1,251		1,261
Total loans, gross	$	8,104	$	16,509	$	730	$	17,239	$	19,813

The following table summarizes average impaired loans, broken out by portfolio segment, during the three and six months ended June 30,2015 and 2014:

(in thousands)	Three Months Ended June 30,
	2015				2014
	Average recorded investment in impaired loans		Interest income recognized		Average recorded investment in impaired loans		Interest income recognized
Commercial loans:
Technology	$	13,620	$	—	$	8,159	$	—
Life sciences	2,311		—		2,214		—
Asset-based loans	334		—		—		—
SBA and USDA	550		—		624		—
Other	3,337		—		—		—
Total commercial loans	20,152		—		10,997		—
Real estate loans:
SBA and USDA	2,872		—		1,283		—
Total real estate loans	2,872		—		1,283		—
Credit cards	—		—		—		—
Total loans, gross	$	23,024	$	—	$	12,280	$	—

(in thousands)	Six Months Ended June 30,
	2015				2014
	Average recorded investment in impaired loans		Interest income recognized		Average recorded investment in impaired loans		Interest income recognized
Commercial loans:
Technology	$	9,008	$	—	$	7,572	$	—
Life sciences	1,746		—		1,375		—
Asset-based loans	312		—		—		—
SBA and USDA	301		—		717		—
Other	2,882		—		—		—
Total commercial loans	14,249		—		9,664		—
Real estate loans:
SBA and USDA	1,465		—		1,283		—
Total real estate loans	1,465		—		1,283		—
Credit cards	—		—		10		—
Total loans, gross	$	15,714	$	—	$	10,957	$	—

The following table summarizes the credit quality indicators, broken out by portfolio segment, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Pass		Performing (Criticized)		Impaired		Total
Commercial loans:
Technology	$	693,726	$	35,298	$	9,992	$	739,016
Life sciences	293,746		11,583		1,911		307,240
Asset-based loans	128,946		14,258		—		143,204
Venture capital/private equity	216,268		—		—		216,268
SBA and USDA	32,175		4,212		539		36,926
Other	10,719		—		3,343		14,062
Total commercial loans	1,375,580		65,351		15,785		1,456,716
Real estate loans:
SBA and USDA	35,843		—		2,152		37,995
Total real estate loans	35,843		—		2,152		37,995
Construction loans:
SBA and USDA	6,752		—		—		6,752
Total construction loans	6,752		—		—		6,752
Credit cards	23,379		—		—		23,379
Total loans, gross	$	1,441,554	$	65,351	$	17,937	$	1,524,842

(in thousands)	December 31, 2014
	Pass		Performing (Criticized)		Impaired		Total
Commercial loans:
Technology	$	575,483	$	47,009	$	9,487	$	631,979
Life sciences	257,143		14,403		2,511		274,057
Asset-based loans	160,558		16,573		570		177,701
Venture capital/private equity	169,143		—		—		169,143
SBA and USDA	35,040		394		175		35,609
Other	3,609		—		3,245		6,854
Total commercial loans	1,200,976		78,379		15,988		1,295,343
Real estate loans:
SBA and USDA	29,613		6,114		1,251		36,978
Total real estate loans	29,613		6,114		1,251		36,978
Construction loans:
SBA and USDA	4,035		—		—		4,035
Total construction loans	4,035		—		—		4,035
Credit cards	17,980		—		—		17,980
Total loans, gross	$	1,252,604	$	84,493	$	17,239	$	1,354,336

Troubled debt restructurings (“TDRs”)

Uncollateralized loans are measured for impairment based on the present value of expected future cash flows, discounted at the historical effective interest rate, while all collateral-dependent loans are measured for impairment based on the fair value of the collateral.

The following table summarizes the Company's loans classified as TDRs, broken out by portfolio segment, during the three and six months ended June 30,2015:

(dollars in thousands)	Three Months Ended June 30, 2015
	Modifications					TDRs That Subsequently Defaulted
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts	Recorded Investment
Commercial loans:
Technology	—	$	—	$	—	—	$	—
Life Sciences	—	—		—		1	600
Other	1	3,343		3,343		—	—
Total commercial loans	1	3,343		3,343		1	600
Total loans, gross	1	$	3,343	$	3,343	1	$	600

(dollars in thousands)	Six Months Ended June 30, 2015
	Modifications					TDRs That Subsequently Defaulted
	Number of Contracts	Pre-Modification Outstanding Recorded Investment		Post-Modification Outstanding Recorded Investment		Number of Contracts	Recorded Investment
Commercial loans:
Technology	—	$	—	$	—	1	$	366
Life Sciences	—	—		—		1	600
Other	1	3,343		3,343		—	—
Total commercial loans	1	3,343		3,343		2	966
Total loans, gross	1	3,343		3,343		2	966

The loan identified as a TDR during the three and six months ended June 30,2015, was restructured to defer interest payments. The loan is considered a nonperforming loan and, as such, was individually considered for allowance for loan losses calculations. There were no modifications of TDRs during the three and six months ended June 30,2014.

The Bank currently has no commitments to lend to borrowers with loans identified as TDRs.

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Investment Securities

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investment Securities

INVESTMENT SECURITIES

Investments in securities are classified into three categories and accounted for as follows:

Securities Held to Maturity—Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost; or

Trading Securities—Debt and equity securities that are bought and held principally for the purpose of selling in the near term are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings; or

Securities Available for Sale—Debt and equity securities not classified as either held to maturity securities or trading securities are classified as available for sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported as other comprehensive income, a separate component of shareholders’ equity.

The Company intends to hold its securities classified as available for sale securities for an indefinite period of time but may sell them prior to maturity. All other securities, which the Company has the positive intent and ability to hold to maturity, are classified as held to maturity securities. The initial classification of securities is determined at the date of purchase. Gains and losses on sales of securities, computed based on specific identification of the adjusted cost of each security, are included in noninterest income at the time of the sales. The Company's investments include agency direct obligations, Small Business Administration ("SBA") pools, agency and non-agency mortgage backed securities ("MBS"), corporate securities, municipal bonds, and asset backed securities ("ABS"). Equity securities include securities obtained from the exercise of equity warrants and required to be held until the expiration of their respective lock-up periods, which expire within one year. The Company intends to monetize these securities upon removal of all sale restrictions (see Note 14).

The following tables summarize the amortized cost and fair value of securities available for sale and securities held to maturity at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
U.S. treasuries	$	159,264	$	243	$	(6	)	$	159,501
Agency direct obligations	30,323		112		—			30,435
SBA pools	162,014		2,606		(46		)	164,574
Agency MBS	666,405		9,871		(1,991		)	674,285
Municipal bonds	97,417		1,782		(268		)	98,931
Corporates	117,397		3,243		(15		)	120,625
Non-agency MBS	185,662		1,018		(1,567		)	185,113
Other ABS	107,495		233		(754		)	106,974
Equity securities	1,099		—		(195		)	904
Total	$	1,527,076	$	19,108	$	(4,842	)	$	1,541,342
Held to maturity securities:
Agency MBS	$	102,368	$	1,991	$	(2,481	)	$	101,878
Municipal bonds	230,582		5,752		(2,540		)	233,794
Corporates	59,922		341		(3,120		)	57,143
Total	$	392,872	$	8,084	$	(8,141	)	$	392,815

(in thousands)	December 31, 2014
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available for sale securities:
U.S. treasuries	$	29,604	$	44	$	(7	)	$	29,641
Agency direct obligations	30,536		95		—			30,631
SBA pools	177,982		2,145		(305		)	179,822
Agency MBS	606,677		9,360		(1,115		)	614,922
Municipal bonds	96,016		2,477		(3		)	98,490
Corporates	117,025		1,732		(398		)	118,359
Non-agency MBS	173,322		1,237		(1,460		)	173,099
Other ABS	48,450		25		(854		)	47,621
Equity securities	2,422		17		(491		)	1,948
Total	$	1,282,034	$	17,132	$	(4,633	)	$	1,294,533
Held to maturity securities:
Agency MBS	$	58,851	$	1,015	$	(107	)	$	59,759
Municipal bonds	181,567		9,187		(445		)	190,309
Corporates	60,007		32		(3,701		)	56,338
Total	$	300,425	$	10,234	$	(4,253	)	$	306,406

Investment securities with a fair value of $335.5 million and $285.7 million at June 30, 2015 and December 31, 2014, respectively, were pledged to secure customer repurchase agreements and to secure prospective borrowing capacities at the Company's correspondent banks, the Federal Reserve Bank, and the Federal Home Loan Bank of Atlanta.

At June 30, 2015 and December 31, 2014, there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of shareholder's equity.

The proceeds from sales and calls of securities and the associated gains and losses were as follows:

	Three Months Ended June 30,				Six Months Ended June 30,
(in thousands)	2015		2014		2015		2014
Proceeds	$	95,671	$	41,554	$	157,745	71,763
Gross gains	1,184		100		1,296		109
Gross losses	159		62		475		62

The following tables show the gross unrealized losses and fair value of the Company’s investments with unrealized losses that are not deemed to be other-than-temporarily impaired. Investment securities contained in the table are aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2015 and December 31, 2014:

(in thousands)	June 30, 2015
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available for sale securities:
U.S. treasuries	$	19,522	$	(6	)	$	—	$	—		$	19,522	$	(6	)
SBA pools	8,167		(46		)	$	3,483	—			11,650		(46		)
Agency MBS	120,677		(1,523		)	21,699		(468		)	142,376		(1,991		)
Municipal bonds	15,410		(268		)	—		—			15,410		(268		)
Corporates	—		—			5,005		(15		)	5,005		(15		)
Non-agency MBS	71,196		(888		)	26,823		(679		)	98,019		(1,567		)
Other ABS	35,830		(232		)	3,349		(522		)	39,179		(754		)
Equity securities	904		(195		)	—		—			904		(195		)
Total	$	271,706	$	(3,158	)	$	60,359	$	(1,684	)	$	332,065	$	(4,842	)
Held to maturity securities:
Agency MBS	$	49,421	$	(2,346	)	$	2,401	$	(135	)	$	51,822	$	(2,481	)
Municipal bonds	84,251		(2,176		)	8,755		(364		)	93,006		(2,540		)
Corporates	29,436		(1,254		)	6,420		(1,866		)	35,856		(3,120		)
Total	$	163,108	$	(5,776	)	$	17,576	$	(2,365	)	$	180,684	$	(8,141	)

(in thousands)	December 31, 2014
	Less Than 12 Months					12 Months or Greater					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
Available for sale securities:
U.S. treasuries	$	9,895	$	(7	)	$	—	$	—		$	9,895	$	(7	)
SBA pools	34,287		(296		)	4,186		(9		)	38,473		(305		)
Agency MBS	128,717		(889		)	17,935		(226		)	146,652		(1,115		)
Municipal bonds	1,671		(3		)	—		—			1,671		(3		)
Corporates	24,140		(398		)	—		—			24,140		(398		)
Non-agency MBS	61,284		(637		)	21,558		(823		)	82,842		(1,460		)
Other ABS	37,527		(146		)	4,708		(708		)	42,235		(854		)
Equity securities	1,859		(491		)	—		—			1,859		(491		)
Total	$	299,380	$	(2,867	)	$	48,387	$	(1,766	)	$	347,767	$	(4,633	)
Held to maturity securities:
Agency MBS	$	—	$	—		$	5,856	$	(107	)	$	5,856	$	(107	)
Municipal bonds	10,657		(116		)	12,688		(329		)	23,345		(445		)
Corporates	40,959		(1,846		)	6,420		(1,855		)	47,379		(3,701		)
Total	$	51,616	$	(1,962	)	$	24,964	$	(2,291	)	$	76,580	$	(4,253	)

At June 30, 2015, there were a total of 52 available for sale securities that were in an unrealized loss position, of which 24 investments had fair values less than their amortized cost for a period of time greater than 12 months. At December 31, 2014, there were a total of 78 available for sale securities that were in an unrealized loss position, of which 24 investments had fair values less than their amortized cost for a period of time greater than 12 months. At June 30, 2015, the fair value of equity securities included $0.1 million in equity securities obtained from the exercise of equity warrants, which the Company intends to monetize upon removal of all sale restrictions, and $0.8 million in other equity securities. At December 31, 2014, the fair value of equity securities included $0.9 million in equity securities obtained from the exercise of equity warrants, which the Company intends to monetize upon removal of all sale restrictions, and $1.0 million in other equity securities.

The Company performs extensive ongoing evaluations of the investment portfolio at the individual security level, including market valuations and impairment analyses. The Company had recorded no impairment for the three months ended June 30,2015 and 2014. The Company had recorded no impairment for the six months ended June 30,2015 and $43 thousand of impairment on certain mortgage-related securities for the six months ended June 30,2014. The Company deemed these securities permanently impaired and unlikely to receive full principal, even if the investments were held to maturity. The Company believes the remainder of the investment portfolio, based on the evaluation performed, will be paid in full and that any temporary impairment will be fully recoverable prior to or at maturity. The Company has the ability and intent to hold the investment securities until forecasted recovery of fair value or until maturity.

The amortized cost of debt securities at June 30, 2015, by contractual maturity, is shown below. Expected maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(in thousands)	June 30, 2015
	Total Amortized Cost		Less than One Year Amortized Cost		After One Year to Five Years Amortized Cost		After Five Years to Ten Years Amortized Cost		After Ten Years Amortized Cost
Available for sale securities:
Contractual maturity
U.S. treasuries	$	159,264	$	—	$	159,264	$	—	$	—
Agency direct obligations	30,323		20,272		10,051		—		—
SBA pools	162,014		—		4,136		82,765		75,113
Agency MBS	666,405		—		2,398		29,622		634,385
Municipal bonds	97,417		—		—		15,185		82,232
Corporates	117,397		13,928		41,843		12,954		48,672
Non-agency MBS	185,662		—		701		7,417		177,544
Other ABS	107,495		3,516		36,755		26,387		40,837
Total	$	1,525,977	$	37,716	$	255,148	$	174,330	$	1,058,783
Held to maturity securities:
Contractual maturity
Agency MBS	$	102,368	$	—	$	—	$	—	$	102,368
Municipal bonds	230,582		—		—		18,295		212,287
Corporates	59,922		—		—		—		59,922
Total	$	392,872	$	—	$	—	$	18,295	$	374,577

There were no transfers between the available for sale portfolio and the held to maturity portfolio for the three and six months ended June 30,2015 and 2014.

XML

Fair Value of Financial Assets and Liabilities

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES

Fair Value Measurements

The Company's marketable investment securities and derivative instruments are financial instruments recorded at fair value on a recurring basis. The Company makes estimates regarding valuation of assets and liabilities measured at fair value in preparing its consolidated financial statements. ASC 825-10 provides an option to report selected financial assets and liabilities at fair value. The Company has not elected to measure any financial assets or liabilities using the fair value option under ASC 825-10.

ASC 820, Fair Value Measurements and Disclosures defines fair value as the price that would be received to sell an asset or paid to transfer a liability (the “exit price”) in an orderly transaction between market participants at the measurement date. Fair value is a market-based measurement considered from the perspective of a market participant who holds the asset or owes the liability rather than an entity-specific measurement.

ASC 820 establishes a three-level hierarchy for disclosure of assets and liabilities recorded at fair value. The classification of assets and liabilities within the hierarchy is based on whether the inputs to the valuation methodology used for measurement are observable or unobservable. Observable inputs reflect market-derived or market-based information obtained from independent sources, while unobservable inputs reflect the Company's estimates about market data.

The three levels for measuring fair value are based on the reliability of inputs and are as follows:

Level 1 Valuations based on quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. Valuation adjustments and block discounts are not applied to instruments utilizing Level 1 inputs. Since valuations are based on quoted prices that are readily available in an active market, valuation of these products does not entail a significant degree of judgment. Assets utilizing Level 1 inputs include exchange-traded equity securities.

Level 2

Valuations based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly. Assets and liabilities utilizing Level 2 inputs include: U.S. treasury and agency securities, mortgage-backed securities, collateralized mortgage obligations, commercial mortgage-backed securities, municipal bonds and notes, Over-the-Counter (“OTC”) derivative instruments (foreign exchange forwards and option contracts, interest rate swaps related to the Company's senior notes, subordinated notes and junior subordinated debentures), and equity warrant assets for shares of public company capital stock.

Level 3

Valuations based on inputs that are unobservable and significant to the overall fair value measurement. Assets utilizing Level 3 inputs include: limited partnership interests in private equity funds, direct equity investments in private companies, mortgage-backed securities, and equity warrant assets for shares of private company capital stock.

For inactive markets, there is little information, if any, to evaluate if individual transactions are orderly. Accordingly, the Company is required to estimate, based upon all available facts and circumstances, the degree to which orderly transactions are occurring. Price quotes based upon transactions that are not orderly are not considered to be determinative of fair value and are given little, if any, weight in measuring fair value. Price quotes based upon transactions that are orderly are considered in determining fair value, with the weight given based upon the facts and circumstances. If sufficient information is not available to determine if price quotes are based upon orderly transactions, less weight is given to the price quote relative to other transactions that are known to be orderly.

To the extent that the 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 that the Company uses to determine 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 is determined is based on the lowest level input that is significant to the fair value measurement in its entirety.

Investment securities are recorded at fair value on a recurring basis. Fair value measurement is based upon quoted market prices, if available. If quoted market prices are not available, fair values are measured using independent pricing models or other model-based valuation techniques such as the present value of future cash flows, adjusted for the security’s credit rating, prepayment assumptions and other factors such as credit loss assumptions.

The types of instruments valued based on quoted market prices in active markets include the Company’s U.S. government and agency securities, mortgage-backed securities and asset-backed securities (“ABS”). Such instruments are generally classified within level 1 or level 2 of the fair value hierarchy. As required by ASC 820, the Company does not adjust the quoted price for such instruments.

Level 3 valuations are for instruments that are not traded in active markets or are subject to transfer restrictions, and may be adjusted to reflect illiquidity and/or non-transferability, with such adjustment generally based on available market evidence. In the absence of such evidence, management’s best estimate is used. Such instruments in this category include some investment securities, all impaired loans, warrants and foreclosed assets.

Transfers between fair value hierarchy levels would represent assets or liabilities that were previously categorized at a higher level for which the inputs to the estimate became less observable or classified at a lower level for which the inputs became more observable during the period. The Company's policy is to recognize transfers between levels at the end of the period.

The following is a summary of the valuation methods and significant assumptions used to estimate fair value:

Available for sale securities

Valuations for the available-for-sale securities are provided by third party external pricing service providers. The Company reviews the methodologies used to determine the fair value, including understanding the nature and observability of the inputs used to determine the price. The Company obtains additional corroboration depending on the type of security, the frequency of trades of the security and the level of liquidity or depth of the market.

Following is a summary of the significant inputs used for each class of assets and liabilities:

U.S. pass-through government mortgages are evaluated based on benchmark curves as well as security set-ups, to be announced (TBA) market, and broker feeds. Fixed-rate Ginnie Mae pools backed by fixed rate reverse mortgages are evaluated based on prepayment speeds, cash flows, swap curves, spread adjustments, coupon and average life. New issue data, monthly payment information and collateral performance are also monitored.

U.S. government collateralized mortgage obligations are evaluated based on benchmark curves, security set-up, prepayment speeds, cashflow scenario analysis, supporting collateral identification and collateral performance. Adjustments are made for spread, yield, price and prepayment speeds. Volatility-driven, multi-dimensional spread tables as well as Option Adjusted Spread model applications are applied.

Non-agency mortgage evaluation methodology is based on security set-up, prepayment speeds, cashflow scenario analysis, benchmark comparisons and supporting collateral identification and performance. Depending on the characteristics of a given tranche, Option Adjust Spread model or multi-dimensional single cash flow stream model is applied.

Municipal bonds are evaluated based on stated coupon rates, final maturity dates, callable options and yield analysis including benchmark comparisons, yield to maturity and yield to worst. Adjustments are made for ratings updates and material event notices. Quotes are based on spreads to other municipal benchmark bonds with similar characteristics or relative to market rates on U.S. treasury bonds of similar maturity.

Corporate and trust preferred security methodology is based on security set up, benchmark comparisons, yield to maturity, issuer name, coupon rate, maturity date and any applicable issuer call option feature. An option adjusted spread model is used for issues that have early redemption features. Adjustments are made for corporate actions. The Floating Rate Note model is applied to variable rate note evaluations.

The methodology for fixed and floating rate asset backed securities is based on benchmark curves as well as security set-up, prepayment speeds, benchmark yields, spread adjustments, ratings updates, collateral performance and price history. Tranche level attributes, cash flows and market color (as available) are also monitored.

SBA pool evaluation methodology is determined by benchmark rates and swap curves, cashflow scenario analysis, coupon, maturity, and supporting collateral identification and collateral performance. The unique structures associated with SBA and SBIC programs are taken into account. Additional adjustments can be made based on the original and remaining terms, coupon, seasonality of the pools and default factors.

U.S. treasury securities are evaluated based on security set up, yield to maturity and through reviewing Treasury trading platform feeds (both active market makers and inter-dealer brokers) for consistency and outliers.

Equity warrant assets

Fair value measurements of equity warrant assets of publicly-traded portfolio companies are valued based on a modified Black-Scholes pricing model. The model uses the stock price of publicly-traded companies, stated exercise prices, warrant expiration dates, the risk-free interest rate and market-observable option volatility assumptions for companies with 90 or more days of trading history. For public companies with less than 90 days of trading history, the iShares Russell Microcap index (IWC) is used to estimate volatility. Further, option expiration dates are modified to account for estimates to actual life relative to stated expiration.

Fair value measurements of equity warrant assets of private portfolio companies are priced based on a modified Black-Scholes option pricing model to estimate asset value by using stated exercise prices, option expiration dates, risk-free interest rates and option volatility assumptions. Option volatility assumptions used in the modified Black-Scholes model are based on the iShares Russell Microcap index (IWC). Option expiration dates are modified to account for estimates to actual life relative to stated expiration.

Servicing asset

Valuation for the Company's servicing asset is provided by a third party external pricing service provider. The Company reviews the methodology used to determine the fair value, including understanding the nature and observability of the inputs used to determine the fair value. The valuation uses generated future cashflows for each asset based on the asset's unique characteristics, market-based assumptions for prepayment speeds and, in the case of non-guaranteed portions of SBA loans, losses and recoveries. The present value of the future cash flows are then calculated utilizing market-based discount rate assumptions. In all cases, each loan’s expected payment for each monthly period is modeled in order to create the most detailed cash flow stream possible.

Venture capital fund investments

To determine the estimated fair value of the Company's venture capital fund investments, the Company evaluates various factors related to the underlying private company entities. The factors are specific to each underlying private company. The factors evaluated include, but are not limited to, actual and forecasted results, cash position, and market comparable companies.

The following tables present quantitative information about Level 3 fair value measurements:

(dollars in thousands)	June 30, 2015
	Fair Value		Valuation Technique	Unobservable Input	Weighted Average Range
Available for sale securities:
Corporates	$	3,011	Sensitivity analyses	Indicative pricing	(1)
Non-agency MBS	185,113		Volatility-driven, multi-dimensional spread tables, optional adjusted spread model and prepayment model	Indicative pricing	(1)
				Collateral performance	(1)
Other ABS	106,974		Multi-dimensional, collateral specific spread tables	Indicative pricing	(1)
				Collateral performance	(1)
Warrants	5,125		Modified Black-Scholes option pricing model	Volatility	19.5% - 127.2% (2)
				Risk-free interest rate	0.6% - 1.2% (2)
				Remaining life assumption	21.8% - 50.8% (2)
Servicing asset	1,450		Discounted cash flow	Discount rates	(1)
				Default rates	(1)
				Prepayment rates	(1)
				Servicing costs	(1)
Venture capital fund investments	4,232		Private company equity pricing	Actual and forecasted results, cash position, market comparable companies	(3)

(dollars in thousands)	December 31, 2014
	Fair Value		Valuation Technique	Unobservable Input	Weighted Average Range
Available for sale securities:
Non-agency MBS	$	173,099	Volatility-driven, multi-dimensional spread tables, optional adjusted spread model and prepayment model	Indicative pricing	(1)
				Collateral performance	(1)
Other ABS	47,621		Multi-dimensional, collateral specific spread tables	Indicative pricing	(1)
				Collateral performance	(1)
Warrants	4,304		Modified Black-Scholes option pricing model	Volatility	20.2% - 67.0% (2)
				Risk-free interest rate	1.2 % - 1.5% (2)
				Remaining life assumption	54.0% - 89.4% (2)
Servicing asset	1,222		Discounted cash flow	Discount rates	(1)
				Default rates	(1)
				Prepayment rates	(1)
				Servicing costs	(1)
Venture capital fund investments	3,704		Private company equity pricing	Actual and forecasted results, cash position, market comparable companies	(3)

(1) The Company uses third-party pricing information without adjustment for this Level 3 fair value measurement.

(2) Low end of range relates to private equity warrant assets portfolio and high end of range relates to public equity warrant assets portfolio.

(3) The factors are specific to each underlying private company, and as such, a weighted average or range of values for the unobservable inputs is not meaningful.

Following are tables that present information about the Company's investment securities, warrants, servicing asset, and venture capital fund investments, measured at fair value on a recurring basis:

(in thousands)	At June 30, 2015
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
Available for sale securities:
U.S. treasuries	$	159,501	$	—	$	—	$	159,501
Agency direct obligations	30,435		—		—		30,435
SBA pools	—		164,574		—		164,574
Agency MBS	—		674,285		—		674,285
Municipal bonds	—		98,931		—		98,931
Corporates	—		117,614		3,011		120,625
Non-agency MBS	—		—		185,113		185,113
Other ABS	—		—		106,974		106,974
Equity securities	904		—		—		904
Total available for sale securities	$	190,840	$	1,055,404	$	295,098	$	1,541,342
Warrants	$	—	$	—	$	5,125	$	5,125
Servicing asset	$	—	$	—	$	1,450	$	1,450
Venture capital fund investments	$	—	$	—	$	4,232	$	4,232

(in thousands)	At December 31, 2014
	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
Available for sale securities:
U.S. treasuries	$	29,641	$	—	$	—	$	29,641
Agency direct obligations	30,631		—		—		30,631
SBA pools	—		179,822		—		179,822
Agency MBS	—		614,922		—		614,922
Municipal bonds	—		98,490		—		98,490
Corporates	—		118,359		—		118,359
Non-agency MBS	—		—		173,099		173,099
Other ABS	—		—		47,621		47,621
Equity securities	1,948		—		—		1,948
Total available for sale securities	$	62,220	$	1,011,593	$	220,720	$	1,294,533
Warrants	$	—	$	—	$	4,304	$	4,304
Servicing asset	$	—	$	—	$	1,222	$	1,222
Venture capital fund investments	$	—	$	—	$	3,704	$	3,704

The following tables present additional information about Level 3 securities, venture capital fund investments, servicing assets and warrants, measured at fair value on a recurring basis:

(dollars in thousands)	Three Months Ended June 30, 2015
	Available for sale securities
	Corporates		Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at March 31, 2015	$	—	$	164,749		$	67,043		$	3,834		$	1,393		$	4,649		$	241,668
Transfers into Level 3	3,011		—			—			—			—			—			3,011
Transfers out of Level 3	—		—			—			—			—			(29		)	(29		)
Total gains (losses):
included in net income	—		—			—			337			(14		)	239			562
included in other comprehensive income	—		(12,688		)	(4,785		)	—			—			—			(17,473		)
Purchases, sales, issuances and settlements:
Purchases	—		47,787			46,009			231			—			—			94,027
Sales	—		(14,735		)	(1,293		)	—			—			(137		)	(16,165		)
Issuances	—		—			—			—			147			403			550
Settlements	—		—			—			(170		)	(76		)	—			(246		)
Balance at June 30, 2015	$	3,011	$	185,113		$	106,974		$	4,232		$	1,450		$	5,125		$	305,905

(dollars in thousands)	Three Months Ended June 30, 2014
	Available for sale securities
	Corporates			Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at March 31, 2014	$	29,391		$	66,651		$	24,605		$	3,958		$	1,298		$	6,596		$	132,499
Transfers into Level 3	—			—			—			—			—			—			—
Transfers out of Level 3	(23,389		)	—			—			(953		)	—			(1,369		)	(25,711		)
Total gains (losses):
included in net income	—			—			—			1,415			6			21			1,442
included in other comprehensive income	83			(2,773		)	(6,810		)	—			—			—			(9,500		)
Purchases, sales, issuances and settlements:
Purchases	—			23,759			16,252			170			—			—			40,181
Sales	—			(2,203		)	—			—			—			(994		)	(3,197		)
Issuances	—			—			—			—			55			493			548
Settlements	—			—			—			(257		)	(34		)	—			(291		)
Balance at June 30, 2014	$	6,085		$	85,434		$	34,047		$	4,333		$	1,325		$	4,747		$	135,971

(dollars in thousands)	Six Months Ended June 30, 2015
	Available for sale securities
	Corporates		Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at December 31, 2014	$	—	$	173,099		$	47,621		$	3,704		$	1,222		$	4,304		$	229,950
Transfers into Level 3	3,011		—			—			—			—			—			3,011
Transfers out of Level 3	—		—			—			—			—			(38		)	(38		)
Total gains (losses):
included in net income	—		—			—			337			(9		)	701			1,029
included in other comprehensive income	—		(22,929		)	(8,252		)	—			—			—			(31,181		)
Purchases, sales, issuances and settlements:
Purchases	—		60,677			68,898			474			—			—			130,049
Sales	—		(25,734		)	(1,293		)	—			—			(942		)	(27,969		)
Issuances	—		—			—			—			331			1,100			1,431
Settlements			—			—			(283		)	(94		)	—			(377		)
Balance at June 30, 2015	$	3,011	$	185,113		$	106,974		$	4,232		$	1,450		$	5,125		$	305,905

(dollars in thousands)	Six Months Ended June 30, 2014
	Available for sale securities
	Corporates			Non-Agency MBS			Other ABS			Venture Capital Fund Investments			Servicing Asset			Warrants			Total
Balance at December 31, 2013	$	26,301		$	52,170		$	22,091		$	4,066		$	1,265		$	5,105		$	110,998
Transfers into Level 3	2,994			—			2,762			—			—			—			5,756
Transfers out of Level 3	(23,389		)	—			—			(953		)	—			(1,369		)	(25,711		)
Total gains (losses):
included in net income	—			—			—			1,415			18			2,216			3,649
included in other comprehensive income	179			(4,405		)	(7,058		)	—			—			—			(11,284		)
Purchases, sales, issuances and settlements:
Purchases	—			39,872			16,252			170			—			—			56,294
Sales	—			(2,203		)	—			—			—			(1,800		)	(4,003		)
Issuances	—			—			—			—			110			595			705
Settlements	—			—			—			(365		)	(68		)	—			(433		)
Balance at June 30, 2014	$	6,085		$	85,434		$	34,047		$	4,333		$	1,325		$	4,747		$	135,971

For the three and six months ended June 30,2015, one available for sale securities was transferred from Level 2 due to lack of observable inputs to substantiate a Level 2 valuation. For the three months ended June 30,2014, no available for sale securities were transferred from Level 2 due to lack of observable inputs to substantiate a Level 2 valuation. For the six months ended June 30,2014, two available for sale securities were transferred from Level 2 due to lack of observable inputs to substantiate a Level 2 valuation.

Investments in Entities that Calculate Net Asset Value Per Share

FASB guidance (ASC 825-10-50-6A) requires disclosures about the fair value measurements of investments in certain entities that calculate net asset value per share or its equivalents. These disclosures include the fair value of funds; significant investment strategies of the investees; for investments that cannot be redeemed, estimates of the time periods over which underlying assets are expected to be liquidated; the amounts of the Company's unfunded commitments; redemption features of the investments; restrictions on the ability to sell the investments; and information about sales in certain circumstances.

The Company has investments in venture capital funds that calculate net asset value per share. The Company's investments in venture capital funds generally cannot be redeemed. Alternatively, the Company expects distributions, if any, to be received primarily through M&A activity and IPOs of the underlying assets of the fund. The Company currently does not have any plans to sell any of these fund investments. If the Company decides to sell these investments in the future, generally the investee fund’s management must approve of the buyer before the sale of the investments can be completed. The fair values of the fund investments have been estimated using the net asset value per share of the investments, adjusted for any differences between the Company's measurement date and the date of the fund investment’s net asset value based on the most recently available financial information from the investee general partner. The most recently available financial information is generally as of the end of the previous quarter. For example, the June 30, 2015 financial statements reflect the March 31, 2015 financial information from the investee general partner, adjusted for any contributions paid, distributions received from the investment, and significant fund transactions or market events during the reporting period.

The following tables summarize the estimated fair values and remaining unfunded commitments for these investments:

(in thousands)	June 30, 2015
	Carrying Value		Fair Value		Unfunded Commitments
Venture capital fund investments	$	4,232	$	4,232	$	1,634
Total	$	4,232	$	4,232	$	1,634

(in thousands)	December 31, 2014
	Carrying Value		Fair Value		Unfunded Commitments
Venture capital fund investments	$	3,704	$	3,704	$	2,076
Total	$	3,704	$	3,704	$	2,076

Venture capital fund investments include investments made by Square 1 Financial, Inc. and Square 1 Bank. These investments represent commitments to venture capital funds that invest in or lend money to primarily U.S. and global technology and life sciences companies and invest in U.S. based venture capital funds themselves. It is estimated that the Company will receive distributions from the fund investments over the next 10 to 13 years, depending on the age of the funds and any potential extensions of terms of the funds.

At June 30, 2015, the $4.2 million venture capital fund investments valuation consisted of $1.6 million of Bank investments primarily for CRA purposes, $1.6 million from Square 1 Ventures, and $1.0 million of holding company investments.

Fair Value of Assets Measured on a Non-recurring Basis

Foreclosed Assets — Upon acquisition, foreclosed assets are initially recorded at the fair value of the asset less cost to sell. Any excess of the recorded investment over the fair value of the property received is charged to the allowance for loan losses. Subsequently, foreclosed assets are carried at the lower of carrying value or net realizable value. Reviews will be performed by management and any subsequent write-downs due to the excess of carrying value of a property over its estimated fair value (less estimated costs to sell) are charged against other expenses. Foreclosed assets are included in other assets in the accompanying consolidated balance sheets.

The following table presents information about the Company's assets measured at fair value on a non-recurring basis:

(in thousands)	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs		Ending Balance
	(Level 1)		(Level 2)		(Level 3)
June 30, 2015
Impaired loans	$	—	$	—	$	9,754	$	9,754
December 31, 2014
Impaired loans	$	—	$	—	$	9,135	$	9,135

Financial Instruments Not Carried at Fair Value

FASB issued guidance over financial instruments (ASC 825-10-65) requires that the Company disclose estimated fair values for the Company's financial instruments not carried at fair value. Fair value estimates, methods and assumptions, set forth below for the Company's financial instruments, are made solely to comply with the requirements of ASC 825.

Fair values are based on estimates or calculations at the transaction level using present value techniques in instances where quoted market prices are not available. Because broadly traded markets do not exist for many of the Company's financial instruments, the fair value calculations attempt to incorporate the effect of current market conditions at a specific time. Fair valuations are management’s estimates of the values, and they are calculated based on indicator prices corroborated by observable market quotes or pricing models, the economic and competitive environment, the characteristics of the financial instruments, expected losses, and other such factors.

These calculations are subjective in nature, involve uncertainties and matters of significant judgment, and do not include tax ramifications; therefore, the results cannot be determined with precision or substantiated by comparison to independent markets, and they may not be realized in an actual sale or immediate settlement of the instruments. There may be inherent weaknesses in any calculation technique, and changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect the results. For all of these reasons, the aggregation of the fair value calculations presented herein does not represent, and should not be construed to represent, the underlying value of the Company.

The following describes the methods and assumptions used in estimating the fair values of financial instruments, excluding financial instruments already recorded at fair value as described above.

Cash and due from banks, federal funds sold and short-term investments

The carrying amounts for cash and due from banks, federal funds sold and short-term investments approximate fair value because of the short maturities of those instruments.

Loans

The fair value of the net loan portfolio has been estimated based on management’s assumptions with respect to present value of expected cash flows, discounted at an interest rate giving consideration to estimated prepayment risk and credit loss factors. There is no material difference between carrying value and fair value of loans as outstanding loans are predominately at variable rates.

Investment securities—held to maturity

The fair value of investment securities held to maturity are based on quoted prices in markets that are not active or for which all significant inputs are observable, directly or indirectly.

FHLB stock

The carrying amount of FHLB stock approximates fair value as it is not practicable to determine the fair value due to restrictions placed on its transferability.

Accrued Interest Receivable

The carrying amount of accrued interest receivable approximates fair value due to the short-term nature of the balance.

Deposits

The fair values of deposits with no stated maturities are predominately at variable rates and, accordingly, the fair values have been estimated to equal the carrying amounts (the amount payable on demand). The fair values of certificates of deposits are estimated by discounting the future cash flows using the current rates offered for similar deposits with the same remaining maturities.

Short-term borrowings

The Company’s short-term borrowings include securities sold under repurchase agreements, federal funds purchased and short-term lines of credit. The carrying amount is a reasonable estimate of fair value because of the relatively short time between the origination of the borrowing and its contractual maturity.

Long-term debt

The Company’s long-term debt includes the Company’s convertible subordinated debentures. Fair value of long-term debt is estimated by discounting the future cash flows using current rates offered with the same maturities, price indications from reputable dealers or utilizing observable market prices of the underlying instrument, whichever is deemed more reliable.

Financial instruments with off-balance sheet risk

With regard to financial instruments with off-balance sheet risk discussed in Note 16, carrying amounts are reasonable estimates of the fair values for such financial instruments. Commitments to extend credit generally result in loans with a market interest rate if funded.

The following tables present the estimated fair values of the Company's financial instruments that are not carried at fair value:

(in thousands)	June 30, 2015
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Estimated Fair Value Ending Balance
Financial assets:
Cash and cash equivalents	$	387,347	$	387,347	$	—	$	—	$	387,347
Investment in time deposits	1,002		1,002		—		—		1,002
Investment securities—held to maturity	392,872		—		386,395		6,420		392,815
Loans, net of unearned income	1,516,032		—		—		1,512,363		1,512,363
FHLB stock	2,787		—		—		2,787		2,787
Accrued interest receivable	13,110		—		13,110		—		13,110
Financial liabilities:
Non-maturity deposits(1)	3,554,380		3,554,380		—		—		3,554,380
Time deposits	9,384		—		9,369		—		9,369
Off-balance sheet financial assets:
Future financing commitments	—		—		—		1,431,391		1,431,391

(1)Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

(in thousands)	December 31, 2014
	Carrying Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Estimated Fair Value Ending Balance
Financial assets:
Cash and cash equivalents	$	85,942	$	85,942	$	—	$	—	$	85,942
Investment in time deposits	1,251		1,251		—		—		1,251
Investment securities—held to maturity	300,425		—		299,986		6,420		306,406
Loans, net of unearned income	1,346,449		—		—		1,336,470		1,336,470
FHLB stock	2,091		—		—		2,091		2,091
Accrued interest receivable	11,878		—		11,878		—		11,878
Financial liabilities:
Non-maturity deposits(1)	2,760,232		2,760,232		—		—		2,760,232
Time deposits	16,320		—		16,268		—		16,268
Off-balance sheet financial assets:
Future financing commitments	—		—		—		1,232,078		1,232,078

(1)Includes noninterest demand deposits, interest-bearing demand deposits and money market deposits.

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Regulatory Matters and Restrictions

6 Months Ended

Jun. 30, 2015

Regulatory Capital Requirements [Abstract]

Regulatory Matters and Restrictions

REGULATORY MATTERS AND RESTRICTIONS

The Company and the Bank are subject to various regulatory capital requirements administered by the federal and state banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the consolidated financial statements. Quantitative measures established by regulation to ensure capital adequacy require the Bank to maintain minimum amounts and ratios, as set forth in the table below. Management believes that at June 30, 2015, the Company and the Bank met all capital requirements to which they are subject and are “well-capitalized”.

On January 1, 2015, the Basel III regulatory standard on bank capital adequacy became effective. The rule establishes a new Common Equity Tier 1 minimum capital requirement (4.5% of risk-weighted assets), increases the minimum Tier 1 capital to risk-based assets requirement (from 4.0% to 6.0% of risk-weighted assets), and requires institutions to hold 8.0% total capital and 4.0% Tier 1 capital to average consolidated assets (“Leverage Ratio”). It also increases the Tier 1 capital to risk-based assets threshold ratio for "well capitalized" from 6.0% to 8.0% or risk-weighted assets.

The Bank, as a North Carolina banking corporation, may pay dividends only out of undivided profits as determined pursuant to North Carolina General Statutes Section 53-87. Regulatory authorities may further limit payment of dividends by any bank when it is determined that such a limitation is in the public interest and is necessary to ensure financial soundness of the bank.

The Company’s actual capital amounts and ratios at June 30, 2015 and December 31, 2014, and the minimum capital requirements, are presented in the following table:

(dollars in thousands)
	Minimum Requirements to be:
COMPANY	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital ratio	$	344,658	13.12	%	$	210,097	8.00	%	$	262,621	10.00	%
Tier 1 risk-based capital ratio	317,608		12.09		157,572		6.00		210,097		8.00
Common equity Tier 1 capital ratio	317,608		12.09		118,179		4.50		170,703		6.50
Tier 1 leverage ratio	317,608		9.07		140,118		4.00		175,148		5.00
December 31, 2014
Total risk-based capital ratio	$	318,344	14.95	%	$	170,340	8.00	%	$	212,925	10.00	%
Tier 1 risk-based capital ratio	294,441		13.83		85,170		4.00		127,755		6.00
Tier 1 leverage ratio	294,441		9.71		121,289		4.00		151,611		5.00

The Bank’s actual capital amounts and ratios at June 30, 2015 and December 31, 2014, and the minimum capital requirements, are presented in the following table:

(dollars in thousands)
	Minimum Requirements to be:
BANK	Actual				Adequately Capitalized				Well Capitalized
	Amount		Ratio		Amount		Ratio		Amount		Ratio
June 30, 2015
Total risk-based capital ratio	$	335,229	12.82	%	$	209,186	8.00	%	$	261,483	10.00	%
Tier 1 risk-based capital ratio	308,179		11.79		156,890		6.00		209,186		8.00
Common equity Tier 1 capital ratio	308,179		11.79		117,667		4.50		169,964		6.50
Tier 1 leverage ratio	308,179		8.82		139,787		4.00		174,733		5.00
December 31, 2014
Total risk-based capital ratio	$	309,928	14.61	%	$	169,752	8.00	%	$	212,190	10.00	%
Tier 1 risk-based capital ratio	286,025		13.48		84,876		4.00		127,314		6.00
Tier 1 leverage ratio	286,025		9.44		121,186		4.00		151,483		5.00

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Repurchase Agreements and Reverse Repurchase Agreements

6 Months Ended

Jun. 30, 2015

Secured Debt, Repurchase and Reverse Repurchase Agreements and Dollar Rolls [Abstract]

Repurchase Agreements And Reverse Repurchase Agreements

REPURCHASE AGREEMENTS AND REVERSE REPURCHASE AGREEMENTS

Securities purchased under agreements to resell generally mature within one to four days from the transaction date. The Company had no reverse repurchase agreements outstanding at June 30, 2015 or December 31, 2014.

Securities sold under agreements to repurchase generally mature within one to four days from the transaction date. Securities sold under agreements to repurchase are reflected at the amount of cash received in connection with the transaction. The Company may be required to provide additional collateral based on the fair value of the underlying securities. The Company had no repurchase agreements outstanding at June 30, 2015 or December 31, 2014.

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Equity Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Proceeds from issuance of common stock, net of issuance costs			$ 260	$ 58,758
Employee Stock Option [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			325,986
Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, shares issued and outstanding	0	0	0	0	0		5,000
Preferred Stock, Dividend Rate, Percentage				5.00%
Convertible Preferred Stock, Conversion Price Per Share				$ 10.00
Convertible Preferred Stock [Member] | 2010 Warrants [Member]
Class of Stock [Line Items]
Issuance of common stock (shares)			603,436
Common Stock [Member]
Class of Stock [Line Items]
Common shares issued upon conversion of preferred stock				500,070
Conversion of trust preferred securities, common shares issued		366,500		741,500
Common Stock [Member] | Restricted Stock Units (RSUs) [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures	3,139	2,290	49,600	42,330
Common Stock [Member] | Employee Stock Option [Member]
Class of Stock [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period	93,925	78,600	319,078	118,730
Common Stock [Member] | IPO [Member]
Class of Stock [Line Items]
Issuance of common stock (shares)				3,125,000
Sale of Stock, Price Per Share						$ 18.00
Proceeds from issuance of common stock, net of issuance costs				$ 51,100
Common Stock [Member] | Underwriter's Purchase Option [Member]
Class of Stock [Line Items]
Issuance of common stock (shares)				468,750
Proceeds from issuance of common stock, net of issuance costs				$ 7,900
Common Stock [Member] | 2010 Warrants [Member]
Class of Stock [Line Items]
Shares Of Company Stock Purchasable From Warrants Issued					750,000
Warrant Exercise Price Per Share					$ 5.15
Warrants and Rights Outstanding					$ 1,800
Common Stock [Member] | 2005 Warrants [Member]
Class of Stock [Line Items]
Issuance of common stock (shares)	26,000	28,000	26,000	32,000
Warrants and Rights Outstanding	4,000		4,000		30,000
Warrant Exercise Price Per Share	$ 10.00		$ 10.00

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Intangible Assets

6 Months Ended

Jun. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

INTANGIBLE ASSETS

The Bank recognizes servicing right intangibles related to obligations to service financial assets. See Note 15 for information about the Company's servicing assets. The Bank acquired certain intangible assets, consisting of non-compete agreements and existing customer relationships, as part of its acquisition of Sand Hill Finance LLC on December 31, 2013. The non-compete agreements and existing customer relationships are finite-lived intangible assets subject to amortization. The non-compete agreements intangible asset had a one-year amortization period and the existing customer relationships intangible asset has a three-year amortization period. The acquired intangible assets do not have renewal or extension provisions.

The Company's finite-lived intangible assets at June 30, 2015 and December 31, 2014, are as follows:

(in thousands)	June 30, 2015			December 31, 2014
Non-compete agreements	$	210		$	210
Existing customer relationships	590			590
Total gross carrying amounts	800			800
Accumulated amortization - non-compete agreements	(210		)	(210		)
Accumulated amortization - existing customer relationships	(295		)	(197		)
Total accumulated amortization	(505		)	(407		)
Total intangible assets subject to amortization, net	$	295		$	393

Amortization expense, net of tax for the three and six months ended June 30,2015, amounted to $30 thousand and $62 thousand, respectively. Amortization expense, net of tax for the three and six months ended June 30,2014, amounted to $62 thousand and $125 thousand, respectively. Amortization expense, net of tax is included in other noninterest expense on the accompanying consolidated statements of income.

The following table shows the expected amortization for the next five years for intangible assets at June 30,2015:

(in thousands)
2015	99
2016	196
	$	295

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Deposits

6 Months Ended

Jun. 30, 2015

Deposits [Abstract]

Deposits

DEPOSITS

Time deposits in denominations of $100,000 or more were approximately $9.2 million and $16.0 million at June 30, 2015 and December 31, 2014, respectively. Interest expense paid on time deposits individually exceeding $100,000 totaled $3 thousand and $8 thousand for the three and six months ended June 30,2015, respectively. Interest expense paid on time deposits individually exceeding $100,000 totaled $16 thousand and $30 thousand for the three and six months ended June 30,2014, respectively. At June 30, 2015, time deposits scheduled to mature on or before June 30,2016, totaled $8.2 million. The remaining $1.0 million is scheduled to mature in 2017. At June 30,2015 and December 31, 2014, the aggregate amount of overdrawn demand deposits reclassified to loans was $0.1 million and $0.9 million, respectively.

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Borrowings

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Borrowings

BORROWINGS

The Company may purchase federal funds through unsecured federal funds lines of credit totaling $60.0 million. These lines of credit are intended for short-term borrowings and are subject to restrictions limiting the frequency and terms of advances. These lines of credit are payable on demand and bear interest based upon the daily federal funds rate. The Company also has the ability to utilize short-term borrowings from the Federal Reserve Bank with interest based upon the Federal Reserve US Primary Credit Discount Rate. This $83.4 million line is secured by loans and investment securities. There were no outstanding borrowings for these lines at June 30, 2015 and December 31, 2014.

In addition, the Company has the ability to borrow longer term from the Federal Home Loan Bank ("FHLB"), with a $250.4 million line of credit available. The rate on these advances varies based on borrowing terms. Advances from this line of credit must be adequately collateralized with securities. There were no outstanding borrowings for this line at June 30, 2015 and December 31, 2014.

In September 2008, the Company issued $7.4 million of convertible trust preferred securities. These securities were placed through Square 1 Financial Capital Trust I (the “Trust”), a Delaware trust that was formed by the Company, as sponsor, in order to facilitate the issuance of convertible trust preferred securities. The Trust held, as its sole asset, the subordinated debentures issued by the Company. The Company did not consolidate the Trust into its consolidated financial statements. The subordinated debentures issued by the Company amounted to $7.6 million. A debt discount of $1.5 million was recorded and was to be amortized over 30 years.

In 2014, the Company notified the holders of all trust preferred securities of its intent to redeem such securities as of June 30, 2014. All outstanding trust preferred securities were converted by the holders into shares of Company common stock prior to that date and the Trust was dissolved. During the three and six months ended June 30,2014, investors converted $3.7 million and $7.4 million, respectively, of the outstanding convertible trust preferred securities into 366,500 Class A common shares and 741,500 Class A common shares, respectively, at $10.00 per share. For the three and six months ended June 30,2014, interest expense on the trust preferred securities was $56 thousand and $215 thousand, respectively.

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Regulatory Matters and Restrictions (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common equity Tier 1 capital ratio, Adequately Capitalized, Ratio	4.50%
Common equity Tier 1 capital ratio, Well Capitalized, Ratio	6.50%
Company [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital ratio, Actual, Amount	$ 344,658	$ 318,344
Total risk-based capital ratio, Actual, Ratio	13.12%	14.95%
Total risk-based capital ratio, Adequately Capitalized, Amount	$ 210,097	$ 170,340
Total risk-based capital ratio, Adequately Capitalized, Ratio	8.00%	8.00%
Total risk-based capital ratio, Well Capitalized, Amount	$ 262,621	$ 212,925
Total risk-based capital ratio, Well Capitalized, Ratio	10.00%	10.00%
Tier 1 risk-based capital ratio, Actual, Amount	$ 317,608	$ 294,441
Tier 1 risk-based capital ratio, Actual, Ratio	12.09%	13.83%
Tier 1 risk-based capital ratio, Adequately Capitalized, Amount	$ 157,572	$ 85,170
Tier 1 risk-based capital ratio, Adequately Capitalized, Ratio	6.00%	4.00%
Tier 1 risk-based capital, Well Capitalized, Amount	$ 210,097	$ 127,755
Tier 1 risk-based capital ratio, Well Capitalized, Ratio	8.00%	6.00%
Common equity Tier 1 capital ratio, Actual, Amount	$ 317,608
Common equity Tier 1 capital ratio, Actual, Ratio	12.09%
Common equity Tier 1 capital ratio, Adequately Capitalized, Amount	$ 118,179
Common equity Tier 1 capital ratio, Well Capitalized, Amount	170,703
Tier 1 leverage ratio, Actual, Amount	$ 317,608	$ 294,441
Tier 1 leverage ratio, Actual, Ratio	9.07%	9.71%
Tier 1 leverage ratio, Adequately Capitalized, Amount	$ 140,118	$ 121,289
Tier 1 leverage ratio, Adequately Capitalized, Ratio	4.00%	4.00%
Tier 1 leverage ratio, Well Capitalized, Amount	$ 175,148	$ 151,611
Tier 1 leverage ratio, Well Capitalized, Ratio	5.00%	5.00%
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total risk-based capital ratio, Actual, Amount	$ 335,229	$ 309,928
Total risk-based capital ratio, Actual, Ratio	12.82%	14.61%
Total risk-based capital ratio, Adequately Capitalized, Amount	$ 209,186	$ 169,752
Total risk-based capital ratio, Adequately Capitalized, Ratio	8.00%	8.00%
Total risk-based capital ratio, Well Capitalized, Amount	$ 261,483	$ 212,190
Total risk-based capital ratio, Well Capitalized, Ratio	10.00%	10.00%
Tier 1 risk-based capital ratio, Actual, Amount	$ 308,179	$ 286,025
Tier 1 risk-based capital ratio, Actual, Ratio	11.79%	13.48%
Tier 1 risk-based capital ratio, Adequately Capitalized, Amount	$ 156,890	$ 84,876
Tier 1 risk-based capital ratio, Adequately Capitalized, Ratio	6.00%	4.00%
Tier 1 risk-based capital, Well Capitalized, Amount	$ 209,186	$ 127,314
Tier 1 risk-based capital ratio, Well Capitalized, Ratio	8.00%	6.00%
Common equity Tier 1 capital ratio, Actual, Amount	$ 308,179
Common equity Tier 1 capital ratio, Actual, Ratio	11.79%
Common equity Tier 1 capital ratio, Adequately Capitalized, Amount	$ 117,667
Common equity Tier 1 capital ratio, Well Capitalized, Amount	169,964
Tier 1 leverage ratio, Actual, Amount	$ 308,179	$ 286,025
Tier 1 leverage ratio, Actual, Ratio	8.82%	9.44%
Tier 1 leverage ratio, Adequately Capitalized, Amount	$ 139,787	$ 121,186
Tier 1 leverage ratio, Adequately Capitalized, Ratio	4.00%	4.00%
Tier 1 leverage ratio, Well Capitalized, Amount	$ 174,733	$ 151,483
Tier 1 leverage ratio, Well Capitalized, Ratio	5.00%	5.00%

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Stock-based Compensation Plan Stock Options (Details) - Employee Stock Option [Member] - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, Shares	1,175,675
Granted, Shares	0
Exercised, Shares	(325,986)
Forfeited, Shares	(660)
Outstanding at end of period, Shares	849,029	1,175,675
Options exercisable at period end, Shares	533,319
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding at beginning of period, Weighted Average Exercise Price	$ 6.12
Granted, Weighted Average Exercise Price	0.00
Exercised, Weighted Average Exercise Price	6.07
Forfeited, Weighted Average Exercise Price	6.00
Outstanding at end of period, Weighted Average Exercise Price	6.14	$ 6.12
Options exercisable at period end, Weighted Average Exercise Price	$ 6.07
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	3 years 11 months 20 days	3 years 4 months 15 days
SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	3 years 11 months 20 days	3 years 4 months 15 days
Options exercisable at period end, Weighted Average Remaining Contractual Life in Years	3 years 11 months 10 days

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Income Taxes (Details) $ in Millions	Jun. 30, 2015 USD ($)
Income Tax Disclosure [Abstract]
Deferred Tax Assets, Valuation Allowance	$ 0.3

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Intangible Assets (Tables)

6 Months Ended

Jun. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The Company's finite-lived intangible assets at June 30, 2015 and December 31, 2014, are as follows:

(in thousands)	June 30, 2015			December 31, 2014
Non-compete agreements	$	210		$	210
Existing customer relationships	590			590
Total gross carrying amounts	800			800
Accumulated amortization - non-compete agreements	(210		)	(210		)
Accumulated amortization - existing customer relationships	(295		)	(197		)
Total accumulated amortization	(505		)	(407		)
Total intangible assets subject to amortization, net	$	295		$	393

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

The following table shows the expected amortization for the next five years for intangible assets at June 30,2015:

(in thousands)
2015	99
2016	196
	$	295

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Loans and Allowance for Loan Losses Schedule of Average Impaired Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	$ 23,024	$ 12,280	$ 15,714	$ 10,957
Interest income recognized	0	0	0	0
Commercial loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	20,152	10,997	14,249	9,664
Interest income recognized	0	0	0	0
Commercial loans [Member] | Technology [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	13,620	8,159	9,008	7,572
Interest income recognized	0	0	0	0
Commercial loans [Member] | Life sciences [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	2,311	2,214	1,746	1,375
Interest income recognized	0	0	0	0
Commercial loans [Member] | Asset based loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	334	0	312	0
Interest income recognized	0	0	0	0
Commercial loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	550	624	301	717
Interest income recognized	0	0	0	0
Commercial loans [Member] | Other [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	3,337	0	2,882	0
Interest income recognized	0	0	0	0
Real estate loans [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	2,872	1,283	1,465	1,283
Interest income recognized	0	0	0	0
Real estate loans [Member] | SBA and USDA [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	2,872	1,283	1,465	1,283
Interest income recognized	0	0	0	0
Credit cards [Member]
Financing Receivable, Impaired [Line Items]
Average recorded investment in impaired loans	0	0	0	10
Interest income recognized	$ 0	$ 0	$ 0	$ 0

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Stock-based Compensation Plan

6 Months Ended

Jun. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation Plan

STOCK-BASED COMPENSATION PLAN

The Company maintains a stock-based incentive compensation plan covering certain officers, directors and employees. Grants of options are made by the Compensation Committee of the Board of Directors. Excluding minimal exceptions, all grants must be at no less than fair market value on the date of grant, must be exercised no later than seven years from the date of grant, and may be subject to some vesting provisions. Grants generally vest over five years from the date of grant. The 2009 Stock Incentive Plan, as amended, provides for the issuance of up to 2,820,542 restricted stock units and options to purchase shares of the Company’s stock. At June 30, 2015, 932,818 shares of common stock remained available for future issuance through stock options or restricted stock units.

The following table presents a rollforward of the Company’s stock options outstanding during the six months ended June 30,2015:

					Weighted Average Remaining Contractual Life in Years
	Shares		Weighted Average Exercise Price
Outstanding at beginning of period	1,175,675		$	6.12	3.37
Granted	—		—
Exercised	(325,986	)	6.07
Forfeited	(660	)	6.00
Outstanding at end of period	849,029		$	6.14	3.97
Options exercisable at period end	533,319		$	6.07	3.94

The following table provides information for restricted stock units issued under the stock-based incentive compensation plan during the six months ended June 30,2015:

	Shares		Weighted Average Grant Date Fair Value
Nonvested at beginning of period	376,372		$	10.01
Granted	101,548		26.22
Vested	(70,210	)	17.01
Forfeited	(13,626	)	9.83
Nonvested at end of period	394,084		$	12.94

The Company’s pre-tax compensation cost for stock-based employee compensation was $0.9 million and $2.2 million, respectively, for the three and six months ended June 30,2015. The Company’s pre-tax compensation cost for stock-based employee compensation was $0.7 million and $1.7 million, respectively, for the three and six months ended June 30,2014. At June 30, 2015, there was $4.2 million of unrecognized compensation cost related to non-vested stock-based compensation under this plan to be recognized over five years.

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New Accounting Standards (Policies)

6 Months Ended

Jun. 30, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Pronouncements, Policy [Policy Text Block]

NEW ACCOUNTING STANDARDS

In May 2015, the FASB issued Accounting Standards Update (ASU) 2015-07, Fair Value Measurement (Topic 820), Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). Under the guidance in ASU 2015-07, investments for which fair value is measured using the net asset value per share practical expedient will no longer be categorized within the fair value hierarchy levels, but will be presented as a reconciling line item. Investments that calculate net asset value per share (or its equivalent), but for which the practical expedient is not applied will continue to be included in the fair value hierarchy. ASU 2015-07 also eliminates the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value by limiting those disclosure requirements to investments for which the entity has elected to measure the fair value using that practical expedient. ASU 2015-07 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-07 must be applied retrospectively for all periods presented. The Company is currently assessing the impacts of adopting ASU 2015-07.

In April 2015, the FASB issued ASU No. 2015-05, Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40), Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance to customers to determine whether a cloud computing arrangement includes a software license. When a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses and when a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance in ASC 350-40 applies to hosting contracts where the customer has the contractual right to take possession of the software at any time during the hosting period without significant penalty and it is feasible for the customer to either run the software on its own hardware or contract with another party unrelated to the vendor to host the software. Otherwise, the arrangement should be considered a service contract. ASU 2015-05 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-05 may be adopted prospectively to all arrangements entered into or materially modified after the effective date or retrospectively. The Company is currently assessing the impacts of adopting ASU 2015-05.

In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 simplifies the presentation of debt issuance costs whereby debt issuance costs related to a recognized debt liability shall be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-03 should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. The Company does not expect the adoption of ASU 2015-03 to have a material effect on the Company's balance sheet presentation.

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Loans and Allowance for Loan Losses Schedule of Aging of Gross Loans, Broken Out by Portfolio Segment (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	$ 2,381	$ 3,245
60-89 Days Past Due	2,674	0
Equal to Greater than 90 Days Past Due	3,493	583
Total Loans Past Due	8,548	3,828
Current	1,516,294	1,350,508
Commercial loans, gross	1,456,716	1,295,343
Real estate loans, gross	37,995	36,978
Construction loans, gross	6,752	4,035
Credit cards	23,379	17,980
Total Loans	1,524,842
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	2,381	3,245
60-89 Days Past Due	2,289	0
Equal to Greater than 90 Days Past Due	1,739	175
Total Loans Past Due	6,409	3,420
Current	1,450,307	1,291,923
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member] | Technology [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	2,381	0
60-89 Days Past Due	2,289	0
Equal to Greater than 90 Days Past Due	1,200	0
Total Loans Past Due	5,870	0
Current	733,146	631,979
Commercial loans, gross	739,016	631,979
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member] | Life sciences [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	0
Current	307,240	274,057
Commercial loans, gross	307,240	274,057
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member] | Asset based loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	0
Current	143,204	177,701
Commercial loans, gross	143,204	177,701
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member] | Venture capital/private equity [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	0
Current	216,268	169,143
Commercial loans, gross	216,268	169,143
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member] | SBA and USDA [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	539	175
Total Loans Past Due	539	175
Current	36,387	35,434
Commercial loans, gross	36,926	35,609
Loans Greater than 90 Days Past Due Still Accruing	0	0
Commercial loans [Member] | Other [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	3,245
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	3,245
Current	14,062	3,609
Commercial loans, gross	14,062	6,854
Loans Greater than 90 Days Past Due Still Accruing	0	0
Real estate loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	385	0
Equal to Greater than 90 Days Past Due	1,754	408
Total Loans Past Due	2,139	408
Current	35,856	36,570
Loans Greater than 90 Days Past Due Still Accruing	0	0
Real estate loans [Member] | SBA and USDA [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	385	0
Equal to Greater than 90 Days Past Due	1,754	408
Total Loans Past Due	2,139	408
Current	35,856	36,570
Real estate loans, gross	37,995	36,978
Loans Greater than 90 Days Past Due Still Accruing	0	0
Construction loans [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	0
Current	6,752	4,035
Loans Greater than 90 Days Past Due Still Accruing	0	0
Construction loans [Member] | SBA and USDA [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	0
Current	6,752	4,035
Construction loans, gross	6,752	4,035
Loans Greater than 90 Days Past Due Still Accruing	0	0
Credit cards [Member]
Financing Receivable, Recorded Investment, Aging [Abstract]
30-59 Days Past Due	0	0
60-89 Days Past Due	0	0
Equal to Greater than 90 Days Past Due	0	0
Total Loans Past Due	0	0
Current	23,379	17,980
Loans Greater than 90 Days Past Due Still Accruing	$ 0	$ 0

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Investment Securities Schedule of Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Available for sale securities:
Amortized Cost	$ 1,527,076	$ 1,282,034
Gross Unrealized Gains	19,108	17,132
Gross Unrealized Losses	(4,842)	(4,633)
Available-for-sale securities, Fair Value	1,541,342	1,294,533
Held to maturity securities:
Amortized Cost	392,872	300,425
Gross Unrealized Gains	8,084	10,234
Gross Unrealized Losses	(8,141)	(4,253)
Held to maturity securities, Fair Value	392,815	306,406
US Treasury Securities [Member]
Available for sale securities:
Amortized Cost	159,264	29,604
Gross Unrealized Gains	243	44
Gross Unrealized Losses	(6)	(7)
Available-for-sale securities, Fair Value	159,501	29,641
Agency direct obligations [Member]
Available for sale securities:
Amortized Cost	30,323	30,536
Gross Unrealized Gains	112	95
Gross Unrealized Losses	0	0
Available-for-sale securities, Fair Value	30,435	30,631
SBA pools [Member]
Available for sale securities:
Amortized Cost	162,014	177,982
Gross Unrealized Gains	2,606	2,145
Gross Unrealized Losses	(46)	(305)
Available-for-sale securities, Fair Value	164,574	179,822
Agency MBS [Member]
Available for sale securities:
Amortized Cost	666,405	606,677
Gross Unrealized Gains	9,871	9,360
Gross Unrealized Losses	(1,991)	(1,115)
Available-for-sale securities, Fair Value	674,285	614,922
Held to maturity securities:
Amortized Cost	102,368	58,851
Gross Unrealized Gains	1,991	1,015
Gross Unrealized Losses	(2,481)	(107)
Held to maturity securities, Fair Value	101,878	59,759
Municipal bonds [Member]
Available for sale securities:
Amortized Cost	97,417	96,016
Gross Unrealized Gains	1,782	2,477
Gross Unrealized Losses	(268)	(3)
Available-for-sale securities, Fair Value	98,931	98,490
Held to maturity securities:
Amortized Cost	230,582	181,567
Gross Unrealized Gains	5,752	9,187
Gross Unrealized Losses	(2,540)	(445)
Held to maturity securities, Fair Value	233,794	190,309
Corporates [Member]
Available for sale securities:
Amortized Cost	117,397	117,025
Gross Unrealized Gains	3,243	1,732
Gross Unrealized Losses	(15)	(398)
Available-for-sale securities, Fair Value	120,625	118,359
Held to maturity securities:
Amortized Cost	59,922	60,007
Gross Unrealized Gains	341	32
Gross Unrealized Losses	(3,120)	(3,701)
Held to maturity securities, Fair Value	57,143	56,338
Non-agency MBS [Member]
Available for sale securities:
Amortized Cost	185,662	173,322
Gross Unrealized Gains	1,018	1,237
Gross Unrealized Losses	(1,567)	(1,460)
Available-for-sale securities, Fair Value	185,113	173,099
Other ABS [Member]
Available for sale securities:
Amortized Cost	107,495	48,450
Gross Unrealized Gains	233	25
Gross Unrealized Losses	(754)	(854)
Available-for-sale securities, Fair Value	106,974	47,621
Equity securities [Member]
Available for sale securities:
Amortized Cost	1,099	2,422
Gross Unrealized Gains	0	17
Gross Unrealized Losses	(195)	(491)
Available-for-sale securities, Fair Value	$ 904	$ 1,948

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Interim Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income	$ 9,919	$ 8,051	$ 18,072	$ 15,899
Unrealized (losses) gains on securities:
Unrealized holding (losses) gains arising during period	(2,924)	6,135	1,713	11,454
Less: reclassification adjustment for gains included in net income	(873)	(50)	(638)	(50)
Other comprehensive (loss) income	(3,797)	6,085	1,075	11,404
Comprehensive income	6,122	14,136	19,147	27,303
Dividends on preferred stock	0	1	0	63
Comprehensive income available to common shareholders	$ 6,122	$ 14,135	$ 19,147	$ 27,240

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New Accounting Standards (Notes)

6 Months Ended

Jun. 30, 2015

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

New Accounting Standards

NEW ACCOUNTING STANDARDS

In May 2015, the FASB issued Accounting Standards Update (ASU) 2015-07, Fair Value Measurement (Topic 820), Disclosures for Investments in Certain Entities That Calculate Net Asset Value per Share (or Its Equivalent). Under the guidance in ASU 2015-07, investments for which fair value is measured using the net asset value per share practical expedient will no longer be categorized within the fair value hierarchy levels, but will be presented as a reconciling line item. Investments that calculate net asset value per share (or its equivalent), but for which the practical expedient is not applied will continue to be included in the fair value hierarchy. ASU 2015-07 also eliminates the requirement to make certain disclosures for all investments that are eligible to be measured at fair value using the net asset value by limiting those disclosure requirements to investments for which the entity has elected to measure the fair value using that practical expedient. ASU 2015-07 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-07 must be applied retrospectively for all periods presented. The Company is currently assessing the impacts of adopting ASU 2015-07.

In April 2015, the FASB issued ASU No. 2015-05, Intangibles—Goodwill and Other— Internal-Use Software (Subtopic 350-40), Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement. ASU 2015-05 provides guidance to customers to determine whether a cloud computing arrangement includes a software license. When a cloud computing arrangement includes a software license, the customer should account for the software license element of the arrangement consistent with the acquisition of other software licenses and when a cloud computing arrangement does not include a software license, the customer should account for the arrangement as a service contract. The guidance in ASC 350-40 applies to hosting contracts where the customer has the contractual right to take possession of the software at any time during the hosting period without significant penalty and it is feasible for the customer to either run the software on its own hardware or contract with another party unrelated to the vendor to host the software. Otherwise, the arrangement should be considered a service contract. ASU 2015-05 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-05 may be adopted prospectively to all arrangements entered into or materially modified after the effective date or retrospectively. The Company is currently assessing the impacts of adopting ASU 2015-05.

In April 2015, the FASB issued ASU 2015-03, Interest—Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs. ASU 2015-03 simplifies the presentation of debt issuance costs whereby debt issuance costs related to a recognized debt liability shall be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. ASU 2015-03 is effective for the Company for annual and interim periods beginning after December 15, 2015. Early adoption is permitted. ASU 2015-03 should be applied on a retrospective basis, wherein the balance sheet of each individual period presented should be adjusted to reflect the period-specific effects of applying the new guidance. Upon transition, an entity is required to comply with the applicable disclosures for a change in an accounting principle. The Company does not expect the adoption of ASU 2015-03 to have a material effect on the Company's balance sheet presentation.

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Deposits (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Time Deposits, $100,000 or More [Abstract]
Time Deposits, $100,000 or More	$ 9,200		$ 9,200		$ 16,000
Interest Expense, Time Deposits, $100,000 or More	3	$ 16	8	$ 30
Time Deposit Maturities, Next Twelve Months	8,200		8,200
Time Deposits Maturities, after Next Twelve Months	1,000		1,000
Deposit Liabilities Reclassified as Loans Receivable	$ 100		$ 100		$ 900

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Derivatives Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Derivative [Line Items]
Unearned income on loans	$ 8,810		$ 8,810		$ 7,887
Available-for-sale Securities, Gross Realized Losses	159	$ 62	475	$ 62
Available-for-sale securities, Fair Value	1,541,342		1,541,342		1,294,533
Equity Securities from Warrant Exercises [Member]
Derivative [Line Items]
Available-for-sale Securities, Equity Securities	100		100		900
Public Company [Member] | Equity Securities from Warrant Exercises [Member]
Derivative [Line Items]
Value Of Warrants Exercised For Equity Securities	$ 100		$ 1,200
Monetized Equity Securities Obtained From Warrant Exercises, Number Of Companies	2	1	4	3
Monetized amount of equity security received from warrant exercise	$ 100	$ 300	$ 900
Available-for-sale Securities, Gross Realized Losses			300
Warrant [Member]
Derivative [Line Items]
Unearned income on loans	2,200		2,200		2,000
Amortization of loan fees	600	$ 300	1,000	$ 600
Warrant valuation in warrants held	$ 5,100		$ 5,100		$ 4,300
Number of companies in which warrants are held	484		484		461
Number of companies in which warrant gains were realized	13	20	29	33
Net gains on exercise of equity warrant assets	$ 156	$ 2,158	$ 895	$ 3,016
Warrant [Member] | Public Company [Member]
Derivative [Line Items]
Warrant valuation in warrants held	$ 600		600		$ 200
Value Of Warrants Exercised For Equity Securities		$ 1,400	$ 33
Number of companies in which warrants are held	9		9		6
Number of companies in which warrant gains were realized	0	4	1	4
Net gains on exercise of equity warrant assets		$ 800		$ 800
Late stage [Member] | Warrant [Member]
Derivative [Line Items]
Number of companies in which warrant losses were realized	1		1
Number of companies in which warrant gains were realized	1	2	6	5
Expansion stage [Member] | Warrant [Member]
Derivative [Line Items]
Number of companies in which warrant losses were realized		1		1
Number of companies in which warrant gains were realized	8	12	14	17

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Investment Securities (Policies)

6 Months Ended

Jun. 30, 2015

Investments, Debt and Equity Securities [Abstract]

Investment, Policy [Policy Text Block]

Investments in securities are classified into three categories and accounted for as follows:

Securities Held to Maturity—Debt securities that the Company has the positive intent and ability to hold to maturity are classified as held to maturity and reported at amortized cost; or

Trading Securities—Debt and equity securities that are bought and held principally for the purpose of selling in the near term are classified as trading securities and reported at fair value, with unrealized gains and losses included in earnings; or

Securities Available for Sale—Debt and equity securities not classified as either held to maturity securities or trading securities are classified as available for sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported as other comprehensive income, a separate component of shareholders’ equity.

The Company intends to hold its securities classified as available for sale securities for an indefinite period of time but may sell them prior to maturity. All other securities, which the Company has the positive intent and ability to hold to maturity, are classified as held to maturity securities. The initial classification of securities is determined at the date of purchase. Gains and losses on sales of securities, computed based on specific identification of the adjusted cost of each security, are included in noninterest income at the time of the sales. The Company's investments include agency direct obligations, Small Business Administration ("SBA") pools, agency and non-agency mortgage backed securities ("MBS"), corporate securities, municipal bonds, and asset backed securities ("ABS"). Equity securities include securities obtained from the exercise of equity warrants and required to be held until the expiration of their respective lock-up periods, which expire within one year. The Company intends to monetize these securities upon removal of all sale restrictions (see Note 14).

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Fair Value of Financial Assets and Liabilities Fair Value of Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Purchases, sales, issuances and settlements:
Number of available for sale securities transfered into Level 3 from Level 2	1	2	1	2
Recurring [Member] | Level 3 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 241,668	$ 132,499	$ 229,950	$ 110,998
Transfers into Level 3	3,011	0	3,011	5,756
Transfers out of Level 3	(29)	(25,711)	(38)	(25,711)
Total gains (losses) included in net income	562	1,442	1,029	3,649
Total gains (losses) included in other comprehensive income	(17,473)	(9,500)	(31,181)	(11,284)
Purchases, sales, issuances and settlements:
Purchases	94,027	40,181	130,049	56,294
Sales	(16,165)	(3,197)	(27,969)	(4,003)
Issuances	550	548	1,431	705
Settlements	(246)	(291)	(377)	(433)
Balance at end of period	305,905	135,971	305,905	135,971
Recurring [Member] | Level 3 [Member] | Corporates [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	0	29,391	0	26,301
Transfers into Level 3	3,011	0	3,011	2,994
Transfers out of Level 3	0	(23,389)	0	(23,389)
Total gains (losses) included in net income	0	0	0	0
Total gains (losses) included in other comprehensive income	0	83	0	179
Purchases, sales, issuances and settlements:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0		0
Balance at end of period	3,011	6,085	3,011	6,085
Recurring [Member] | Level 3 [Member] | Non-agency MBS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	164,749	66,651	173,099	52,170
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Total gains (losses) included in net income	0	0	0	0
Total gains (losses) included in other comprehensive income	(12,688)	(2,773)	(22,929)	(4,405)
Purchases, sales, issuances and settlements:
Purchases	47,787	23,759	60,677	39,872
Sales	(14,735)	(2,203)	(25,734)	(2,203)
Issuances	0	0	0	0
Settlements	0	0	0	0
Balance at end of period	185,113	85,434	185,113	85,434
Recurring [Member] | Level 3 [Member] | Other ABS [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	67,043	24,605	47,621	22,091
Transfers into Level 3	0	0	0	2,762
Transfers out of Level 3	0	0	0	0
Total gains (losses) included in net income	0	0	0	0
Total gains (losses) included in other comprehensive income	(4,785)	(6,810)	(8,252)	(7,058)
Purchases, sales, issuances and settlements:
Purchases	46,009	16,252	68,898	16,252
Sales	(1,293)	0	(1,293)	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Balance at end of period	106,974	34,047	106,974	34,047
Recurring [Member] | Level 3 [Member] | Venture capital fund investments [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	3,834	3,958	3,704	4,066
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	(953)	0	(953)
Total gains (losses) included in net income	337	1,415	337	1,415
Total gains (losses) included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements:
Purchases	231	170	474	170
Sales	0	0	0	0
Issuances	0	0	0	0
Settlements	(170)	(257)	(283)	(365)
Balance at end of period	4,232	4,333	4,232	4,333
Recurring [Member] | Level 3 [Member] | Servicing Contracts [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	1,393	1,298	1,222	1,265
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Total gains (losses) included in net income	(14)	6	(9)	18
Total gains (losses) included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements:
Purchases	0	0	0	0
Sales	0	0	0	0
Issuances	147	55	331	110
Settlements	(76)	(34)	(94)	(68)
Balance at end of period	1,450	1,325	1,450	1,325
Recurring [Member] | Level 3 [Member] | Warrant [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	4,649	6,596	4,304	5,105
Transfers into Level 3	0	0	0	0
Transfers out of Level 3	(29)	(1,369)	(38)	(1,369)
Total gains (losses) included in net income	239	21	701	2,216
Total gains (losses) included in other comprehensive income	0	0	0	0
Purchases, sales, issuances and settlements:
Purchases	0	0	0	0
Sales	(137)	(994)	(942)	(1,800)
Issuances	403	493	1,100	595
Settlements	0	0	0	0
Balance at end of period	$ 5,125	$ 4,747	$ 5,125	$ 4,747

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Derivatives (Tables)

6 Months Ended

Jun. 30, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments [Table Text Block]

The following table presents gains and losses on equity warrant exercises and the number of companies on which warrants were exercised, broken out by stage of emerging companies:

(in thousands except number of companies)	Three Months Ended June 30,						Six Months Ended June 30,
	2015			2014			2015			2014
Equity warrant assets:
Gains:
Early stage	$	60		$	889		$	206		$	1,030
Expansion stage	90			1,144			197			1,534
Late stage	10			127			496			454
Total gains on exercise of equity warrant assets	160			2,160			899			3,018
Losses:
Expansion stage	—			(2		)	—			(2		)
Late stage	(4		)	—			(4		)	—
Total losses on exercise of equity warrant assets (1)	(4		)	(2		)	(4		)	(2		)
Net gains on exercise of equity warrant assets	156			2,158			895			3,016
Non-monetized write off of warrant assets	(66		)	(97		)	(125		)	(176		)
Net realized gains on equity warrants	90			2,061			770			2,840
Change in fair value of equity warrant assets	149			(2,040		)	(69		)	(624		)
Warrant income	$	239		$	21		$	701		$	2,216
Number of companies on which warrant gains were realized:
Early stage	4			6			9			11
Expansion stage	8			12			14			17
Late stage	1			2			6			5
Total number of companies	13			20			29			33

(1) Realized warrant losses for the three and six months ended June 30,2015 related to one late stage company. Realized warrant losses for the three and six months ended June 30,2014 related to one expansion stage company.

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Retirement Plan

6 Months Ended

Jun. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Retirement Plan

RETIREMENT PLAN

The Company approved in January 2006 the establishment of an employee benefit plan (the “Plan”) pursuant to Section 401(k) of the Internal Revenue Code for the benefit of its employees. The Plan includes provisions for discretionary employee contributions, subject to limitation under the Internal Revenue Code. Under the Plan, employees may contribute up to an annual maximum as determined by the Internal Revenue Code. During 2015 and 2014, the Company matched 100% of the first 3% of employee contributions and 50% on contributions between 3-5%. The expense related to the plan for the three and six months ended June 30,2015 amounted to $0.3 million and $0.7 million, respectively. The expense related to the plan for the three and six months ended June 30,2014 amounted to $0.2 million and $0.6 million, respectively.