Pacwest Bancorp (PACW) 10-Q 7 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 27, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	PACWEST BANCORP
Entity Central Index Key	1,102,112
Document Period End Date	Sep. 30, 2017
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		128,935,736

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASSETS:
Cash and due from banks	$ 147,579	$ 337,965
Interest-earning deposits in financial institutions	122,439	81,705
Total cash and cash equivalents	270,018	419,670
Securities available-for-sale, at fair value	3,532,230	3,223,830
Federal Home Loan Bank stock, at cost	17,250	21,870
Total investment securities	3,549,480	3,245,700
Gross loans and leases held for investment	15,756,285	15,520,537
Deferred fees, net	(65,768)	(64,583)
Allowance for loan and lease losses	(159,606)	(157,238)
Total loans and leases held for investment, net	15,530,911	15,298,716
Equipment leased to others under operating leases	233,866	229,905
Premises and equipment, net	28,910	38,594
Foreclosed assets, net	11,630	12,976
Deferred tax asset, net	65,321	94,112
Goodwill	2,173,949	2,173,949
Core deposit and customer relationship intangibles, net	27,188	36,366
Other assets	351,659	319,779
Total assets	22,242,932	21,869,767
LIABILITIES AND STOCKHOLDERS' EQUITY
Noninterest-bearing deposits	6,911,874	6,659,016
Interest-bearing deposits	9,861,371	9,211,595
Total deposits	16,773,245	15,870,611
Borrowings	250,399	905,812
Subordinated debentures	448,126	440,744
Accrued interest payable and other liabilities	160,494	173,545
Total liabilities	17,632,264	17,390,712
Commitments and contingencies (Note 7)
Preferred stock ($0.01 par value; 5,000,000 shares authorized; none issued and outstanding)	0	0
Common stock ($0.01 par value, 200,000,000 shares authorized at September 30, 2017 and December 31, 2016; 123,122,892 and 122,803,029 shares issued, respectively, including 1,393,874 and 1,476,132 shares of unvested restricted stock, respectively)	1,231	1,228
Additional paid-in capital	4,000,543	4,162,132
Retained earnings	639,434	366,073
Treasury stock, at cost (1,673,098 and 1,519,360 shares at September 30, 2017 and December 31, 2016)	(64,153)	(56,360)
Accumulated other comprehensive income, net	33,613	5,982
Total stockholders' equity	4,610,668	4,479,055
Total liabilities and stockholders' equity	$ 22,242,932	$ 21,869,767

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2017	Dec. 31, 2016
Preferred stock par value (usd per share)	$ 0.01	$ 0.01
Preferred stock authorized (shares)	5,000,000	5,000,000
Preferred stock issued (shares)	0	0
Preferred stock outstanding (shares)	0	0
Common Stock par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	200,000,000	200,000,000
Common stock issued (shares)	123,122,892	122,803,029
Unvested restricted shares (shares)	1,393,874	1,476,132
Treasury Stock (shares)	1,673,098	1,519,360

Condensed Consolidated Statemen

Condensed Consolidated Statements of Earnings - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest income:
Loans and leases	$ 235,666	$ 234,618	$ 225,370	$ 694,462	$ 686,071
Investment securities	24,762	24,689	22,187	72,490	67,154
Deposits in financial institutions	538	237	298	967	914
Total interest income	260,966	259,544	247,855	767,919	754,139
Interest expense:
Deposits	13,071	10,205	7,247	31,653	24,143
Borrowings	188	1,066	695	2,272	1,628
Subordinated debentures	6,017	5,800	5,278	17,379	15,382
Total interest expense	19,276	17,071	13,220	51,304	41,153
Net interest income	241,690	242,473	234,635	716,615	712,986
Provision for credit losses	15,119	11,499	8,471	51,346	42,514
Net interest income after provision for credit losses	226,571	230,974	226,164	665,269	670,472
Noninterest income:
Service charges on deposit accounts	3,465	3,510	3,488	10,733	10,977
Other commissions and fees	9,944	10,583	12,528	30,917	35,090
Leased equipment income	8,332	11,635	8,538	29,442	25,305
Gain on sale of loans and leases	2,848	649	157	4,209	790
Gain on sale of securities	1,236	1,651	382	2,788	8,970
FDIC loss sharing expense, net	0	0	0	0	(8,917)
Other income	5,557	7,254	1,827	23,689	11,365
Total noninterest income	31,382	35,282	26,920	101,778	83,580
Noninterest expense:
Compensation	64,413	65,288	62,661	194,581	185,900
Occupancy	12,729	11,811	12,010	36,148	36,835
Data processing	6,459	6,337	6,234	19,811	17,782
Other professional services	4,213	3,976	4,625	11,567	11,598
Insurance and assessments	4,702	4,856	4,324	14,349	14,240
Intangible asset amortization	3,049	3,065	4,224	9,178	13,341
Leased equipment depreciation	4,862	5,232	5,298	15,719	15,608
Foreclosed assets expense (income), net	2,191	(157)	(248)	2,177	(812)
Acquisition, integration and reorganization costs	1,450	1,700	0	3,650	200
Loan expense	3,421	3,884	1,931	10,692	6,231
Other expense	11,053	11,715	9,651	34,921	30,556
Total noninterest expense	118,542	117,707	110,710	352,793	331,479
Earnings before income taxes	139,411	148,549	142,374	414,254	422,573
Income tax expense	(37,945)	(54,902)	(48,479)	(140,473)	(156,054)
Net earnings	$ 101,466	$ 93,647	$ 93,895	$ 273,781	$ 266,519
Earnings per share:
Net earnings (usd per share)	$ 0.84	$ 0.77	$ 0.77	$ 2.26	$ 2.19
Net earnings (usd per share)	0.84	0.77	0.77	2.26	2.19
Dividends declared per share (usd per share)	$ 0.50	$ 0.50	$ 0.50	$ 1.50	$ 1.5

Condensed Consolidated Stateme5

Condensed Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net earnings		$ 101,466	$ 93,647	$ 93,895	$ 273,781	$ 266,519
Other comprehensive income (loss), net of tax:
Unrealized net holding gains (losses) on securities available-for-sale arising during the period		7,812	30,340	(15,954)	49,336	83,653
Income tax (expense) benefit related to unrealized holding gains (losses) arising during the period		(3,198)	(12,350)	6,509	(20,055)	(34,111)
Unrealized net holding gains (losses) on securities available-for-sale, net of tax		4,614	17,990	(9,445)	29,281	49,542
Reclassification adjustment for net (gains) losses included in net earnings	[1]	(1,236)	(1,651)	(382)	(2,788)	(8,970)
Income tax expense (benefit) related to reclassification adjustment		506	672	156	1,138	3,673
Reclassification adjustment for net (gains) losses included in net earnings, net of tax		(730)	(979)	(226)	(1,650)	(5,297)
Other comprehensive income (loss), net of tax		3,884	17,011	(9,671)	27,631	44,245
Comprehensive income		$ 105,350	$ 110,658	$ 84,224	$ 301,412	$ 310,764
[1]	Entire amounts are recognized in "Gain on sale of securities" on the Condensed Consolidated Statements of Earnings.

Condensed Consolidated Stateme6

Condensed Consolidated Statement of Shareholders' Equity - 9 months ended Sep. 30, 2017 - USD ($) $ in Thousands		Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income (Loss)
Balance, December 31, 2016 at Dec. 31, 2016		$ 4,479,055	$ 1,228	$ 4,162,132	$ 366,073	$ (56,360)	$ 5,982
Shares outstanding, beginning balance (shares) at Dec. 31, 2016			121,283,669
Stockholders' Equity Disclosure [Rollforward]
Cumulative effect of change in accounting principle	[1]	291		711	(420)
Net earnings		273,781			273,781
Other comprehensive income - net unrealized gain on securities available-for-sale, net of tax		27,631					27,631
Restricted stock awarded and earned compensation, net of shares forfeited (shares)			319,863
Restricted stock awarded and earned stock compensation, net of shares forfeited		20,198	$ 3	20,195
Restricted stock surrendered (shares)			(153,738)
Restricted stock surrendered		(7,793)				(7,793)
Cash dividends paid		(182,495)		(182,495)
Balance, September 30, 2017 at Sep. 30, 2017		$ 4,610,668	$ 1,231	$ 4,000,543	$ 639,434	$ (64,153)	$ 33,613
Shares outstanding, ending balance (shares) at Sep. 30, 2017			121,449,794
[1]	Impact due to adoption on January 1, 2017 of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting."

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net earnings	$ 273,781	$ 266,519
Depreciation and amortization	23,798	24,761
Amortization of net premiums on securities available-for-sale	30,238	28,012
Amortization of intangible assets	9,178	13,341
Provision for credit losses	51,346	42,514
Gain on sale of foreclosed assets	(282)	(837)
Provision for losses on foreclosed assets	2,138	0
Gain on sale of loans and leases	(4,209)	(790)
Gain on sale of premises and equipment	(388)	(23)
Gain on sale of securities	(2,788)	(8,970)
Gain on BOLI death benefit	(1,050)	(539)
Unrealized gain on derivatives and foreign currencies, net	(449)	(374)
Earned stock compensation	20,198	17,275
Loss on sale of PWEF leasing unit	0	720
Tax effect included in stockholders' equity of restricted stock vesting	0	(4,226)
Decrease in accrued and deferred income taxes, net	10,164	74,946
(Increase) decrease in other assets	(32,765)	1,224
Decrease in accrued interest payable and other liabilities	(20,738)	(23,600)
Net cash provided by operating activities	358,172	429,953
Cash flows from investing activities:
Net increase in loans and leases	(567,291)	(514,224)
Proceeds from sales of loans and leases	293,808	106,109
Proceeds from maturities and paydowns of securities available-for-sale	329,876	184,644
Proceeds from sales of securities available-for-sale	185,533	392,841
Purchases of securities available-for-sale	(804,710)	(303,742)
Net redemptions of Federal Home Loan Bank stock	4,620	324
Proceeds from sales of foreclosed assets	1,455	7,973
Purchases of premises and equipment, net	(5,892)	(6,185)
Proceeds from sales of premises and equipment	10,306	24
Proceeds from sale of PWEF leasing unit	0	138,955
Proceeds from BOLI death benefit	2,478	3,238
Net increase of equipment leased to others under operating leases	(17,956)	(15,802)
Net cash used in investing activities	(567,773)	(5,845)
Cash flows from financing activities:
Net increase in noninterest-bearing deposits	255,874	352,784
Net increase (decrease) in interest-bearing deposits	649,776	(371,005)
Net decrease in borrowings	(655,413)	(78,873)
Restricted stock surrendered	(7,793)	(4,611)
Tax effect included in stockholders' equity of restricted stock vesting	0	4,226
Cash dividends paid	(182,495)	(182,750)
Net cash provided by (used in) financing activities	59,949	(280,229)
Net (decrease) increase in cash and cash equivalents	(149,652)	143,879
Cash and cash equivalents, beginning of period	419,670	396,486
Cash and cash equivalents, end of period	270,018	540,365
Supplemental disclosures of cash flow information:
Cash paid for interest	48,402	41,392
Cash paid for income taxes	146,321	82,721
Loans transferred to foreclosed assets	580	129
Transfers from loans held for investment to loans held for sale	$ 175,158	$ 0

Organization

Organization	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	ORGANIZATION PacWest Bancorp, a Delaware corporation, is a bank holding company registered under the BHCA, with our corporate headquarters located in Beverly Hills, California. Our principal business is to serve as the holding company for our wholly-owned subsidiary, Pacific Western Bank. References to "Pacific Western" or the "Bank" refer to Pacific Western Bank together with its wholly-owned subsidiaries. References to "we," "us," or the "Company" refer to PacWest Bancorp together with its subsidiaries on a consolidated basis. When we refer to "PacWest" or to the "holding company," we are referring to PacWest Bancorp, the parent company, on a stand-alone basis. We are focused on relationship-based business banking to small, middle-market and venture-backed businesses nationwide. At September 30, 2017 , the Bank offers a broad range of loan and lease and deposit products and services through 74 full-service branches located throughout the State of California, one branch located in Durham, North Carolina, and several loan production offices located in cities across the country. We provide commercial banking services, including real estate, construction, and commercial loans, and comprehensive deposit and treasury management services to small and middle-market businesses. We offer additional products and services through our CapitalSource and Square 1 Bank divisions. Our CapitalSource Division provides cash flow, asset-based, equipment, and real estate loans and treasury management services to established middle market businesses on a national basis. Our Square 1 Bank Division offers a comprehensive suite of financial services focused on entrepreneurial businesses and their venture capital and private equity investors, with offices located in key innovation hubs across the United States. In addition, we provide investment advisory and asset management services to select clients through Square 1 Asset Management, Inc., a wholly-owned subsidiary of the Bank and a SEC-registered investment adviser. We generate our revenue primarily from interest received on loans and leases and, to a lesser extent, from interest received on investment securities, and fees received in connection with deposit services, extending credit and other services offered, including foreign exchange services. Our major operating expenses are compensation, occupancy, general operating expenses, and the interest paid by the Bank on deposits and borrowings. We have completed 28 acquisitions from May 1, 2000 through September 30, 2017 . Our acquisitions have been accounted for using the acquisition method of accounting and, accordingly, the operating results of the acquired entities have been included in the consolidated financial statements from their respective acquisition dates. See Note 12. Subsequent Events , for information regarding the completion of the CU Bancorp acquisition on October 20, 2017. Significant Accounting Policies Except as discussed below, our accounting policies are described in Note 1. Nature of Operations and Summary of Significant Accounting Policies , of our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2016 as filed with the Securities and Exchange Commission ("Form 10-K"). Accounting Standards Adopted in 2017 Effective January 1, 2017, the Company adopted ASU 2016-09, " Improvements to Employee Share-Based Accounting ." ASU 2016-09 changed aspects of the accounting for share-based payment award transactions, including: (1) accounting for income taxes; (2) classification of excess tax benefits on the statement of cash flows; (3) forfeitures; (4) minimum statutory tax withholding requirements; and (5) classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax-withholding purposes. The recognition of excess tax benefits and tax deficiencies in the income statement was adopted prospectively. Income tax benefits of $0.03 million and $1.5 million were recognized during the three and nine months ended September 30, 2017 as a result of the adoption of ASU 2016-09. We expect the requirements of ASU 2016-09 to result in fluctuations in our effective tax rate from period to period based upon the timing of share-based award vestings. In connection with the adoption of ASU 2016-09, we elected to recognize forfeitures on stock-based compensation awards when they occur, instead of estimating forfeitures at the grant date of the awards and throughout the vesting period. The modified retrospective application of this change in accounting principle resulted in a cumulative adjustment charge to retained earnings of $420,000 , net of income taxes. We elected to present the classification of excess tax benefits on the statement of cash flows using a prospective transition method and the prior period has not been adjusted. Effective July 1, 2017, the Company early-adopted ASU 2017-08, " Receivables - Nonrefundable Fees and Other Costs (Subtopic 210-20): Premium Amortization on Purchased Callable Debt Securities. " ASU 2017-08 requires certain premiums on callable debt securities to be amortized to the earliest call date. The amortization period for discounts on callable debt securities was not impacted. The adoption of this ASU had no material impact on the Company's consolidated financial position, results of operations, or cash flows. Basis of Presentation Our interim condensed consolidated financial statements are prepared in accordance with U.S. GAAP for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, certain disclosures accompanying annual consolidated financial statements are omitted. In the opinion of management, all significant intercompany accounts and transactions have been eliminated and adjustments, consisting solely of normal recurring accruals and considered necessary for the fair presentation of financial statements for the interim periods, have been included. The current period's results of operations are not necessarily indicative of the results that ultimately may be achieved for the year. The interim condensed consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Form 10-K. Use of Estimates We have made a number of estimates and assumptions related to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period to prepare these condensed consolidated financial statements in conformity with U.S. GAAP. Actual results could differ from those estimates. Material estimates subject to change in the near term include, among other items, the allowance for credit losses, the carrying value of intangible assets, the realization of deferred tax assets, and the fair value estimates of assets acquired and liabilities assumed in acquisitions. These estimates may be adjusted as more current information becomes available, and any adjustment may be significant. Reclassifications Certain prior period amounts have been reclassified to conform to the current period’s presentation format. On the condensed consolidated statements of earnings, beginning with our June 30, 2017 results, we began presenting a new line for "Loan expense" as that category exceeded the disclosure materiality threshold, which previously had been included as part of "Other expense." Included in loan expense are costs related to servicing our loans including legal fees. Prior to 2017, time deposit disclosures were presented as: (1) under $100,000 , and (2) $100,000 or more. We are now using the current FDIC insurance limit of $250,000 and presenting the categories as: (1) $250,000 and under, and (2) over $250,000 .

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	GOODWILL AND OTHER INTANGIBLE ASSETS Goodwill and other intangible assets arise from the acquisition method of accounting for business combinations. Goodwill and other intangible assets generated from business combinations and deemed to have indefinite lives are not subject to amortization and instead are tested for impairment at least annually. Goodwill represents the excess of the purchase price over the fair value of the net assets and other identifiable intangible assets acquired. Impairment exists when the carrying value of the goodwill exceeds its implied fair value. An impairment loss would be recognized in an amount equal to that excess as a charge to "Noninterest expense" in the condensed consolidated statements of earnings. Our other intangible assets with definite lives include CDI and CRI. CDI and CRI are amortized over their respective estimated useful lives and reviewed for impairment at least quarterly. The amortization expense represents the estimated decline in the value of the underlying deposits or loan and lease customers acquired. The weighted average amortization period remaining for all of our CDI and CRI as of September 30, 2017 is 4.7 years and the aggregate amortization expense is expected to be $11.5 million for 2017 . The estimated aggregate amortization expense related to these intangible assets for each of the next five years is $8.8 million for 2018 , $6.7 million for 2019 , $4.7 million for 2020 , $3.0 million for 2021 , and $1.7 million for 2022 . The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated: Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, 2017 2017 2016 2017 2016 (In thousands) Gross Amount of CDI and CRI: Balance, beginning of period $ 64,187 $ 64,187 $ 76,513 $ 64,187 $ 95,524 Fully amortized portion (2,190 ) — (2,811 ) (2,190 ) (20,122 ) Reduction due to sale of PWEF leasing unit — — — — (1,700 ) Balance, end of period 61,997 64,187 73,702 61,997 73,702 Accumulated Amortization: Balance, beginning of period (33,950 ) (30,885 ) (32,747 ) (27,821 ) (42,304 ) Amortization (3,049 ) (3,065 ) (4,224 ) (9,178 ) (13,341 ) Fully amortized portion 2,190 — 2,811 2,190 20,122 Reduction due to sale of PWEF leasing unit — — — — 1,363 Balance, end of period (34,809 ) (33,950 ) (34,160 ) (34,809 ) (34,160 ) Net CDI and CRI, end of period $ 27,188 $ 30,237 $ 39,542 $ 27,188 $ 39,542

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Investment Securities	INVESTMENT SECURITIES Securities Available-for-Sale The following table presents amortized cost, gross unrealized gains and losses, and fair values of securities available-for-sale as of the dates indicated: September 30, 2017 December 31, 2016 Gross Gross Gross Gross Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair Security Type Cost Gains Losses Value Cost Gains Losses Value (In thousands) Residential MBS and CMOs: Agency MBS $ 375,357 $ 4,569 $ (2,385 ) $ 377,541 $ 499,185 $ 6,222 $ (2,964 ) $ 502,443 Agency CMOs 175,429 1,655 (1,134 ) 175,950 145,258 1,528 (497 ) 146,289 Private label CMOs 131,149 4,001 (600 ) 134,550 122,707 4,199 (1,437 ) 125,469 Municipal securities 1,501,196 49,362 (1,408 ) 1,549,150 1,447,064 15,406 (6,011 ) 1,456,459 Agency commercial MBS 996,963 5,764 (6,813 ) 995,914 555,552 1,798 (9,658 ) 547,692 Corporate debt securities 17,000 2,125 — 19,125 47,100 680 (271 ) 47,509 Collateralized loan obligations 19,119 66 (9 ) 19,176 155,440 1,685 (238 ) 156,887 SBA securities 166,949 1,363 (284 ) 168,028 179,085 510 (750 ) 178,845 Asset-backed and other securities 92,345 804 (353 ) 92,796 62,264 358 (385 ) 62,237 Total $ 3,475,507 $ 69,709 $ (12,986 ) $ 3,532,230 $ 3,213,655 $ 32,386 $ (22,211 ) $ 3,223,830 As of September 30, 2017 , securities available-for-sale with a fair value of $339.8 million were pledged as collateral for borrowings, public deposits and other purposes as required by various statutes and agreements. During the three months ended September 30, 2017 , we sold $98.3 million of securities available-for-sale for a gross realized gain of $1.3 million and a gross realized loss of $0.1 million . During the three months ended September 30, 2016 , we sold $39.1 million of securities available-for-sale for a gross realized gain of $1.0 million and a gross realized loss of $0.6 million . During the nine months ended September 30, 2017 , we sold $182.7 million of securities available-for-sale for a gross realized gain of $3.3 million and a gross realized loss of $0.5 million . During the nine months ended September 30, 2016 , we sold $383.9 million of securities available-for-sale for a gross realized gain of $10.6 million and a gross realized loss of $1.6 million . Unrealized Losses on Securities Available-for-Sale The following tables present the gross unrealized losses and fair values of securities available-for-sale that were in unrealized loss positions, for which other-than-temporary impairments have not been recognized in earnings, as of the dates indicated: September 30, 2017 Less Than 12 Months 12 Months or More Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized Security Type Value Losses Value Losses Value Losses (In thousands) Residential MBS and CMOs: Agency MBS $ 52,840 $ (271 ) $ 127,695 $ (2,114 ) $ 180,535 $ (2,385 ) Agency CMOs 55,606 (891 ) 18,436 (243 ) 74,042 (1,134 ) Private label CMOs 45,494 (386 ) 18,080 (214 ) 63,574 (600 ) Municipal securities 78,784 (329 ) 29,203 (1,079 ) 107,987 (1,408 ) Agency commercial MBS 338,883 (2,920 ) 106,766 (3,893 ) 445,649 (6,813 ) Collateralized loan obligations 7,162 (9 ) — — 7,162 (9 ) SBA securities 42,963 (284 ) — — 42,963 (284 ) Asset-backed and other securities 39,723 (295 ) 8,162 (58 ) 47,885 (353 ) Total $ 661,455 $ (5,385 ) $ 308,342 $ (7,601 ) $ 969,797 $ (12,986 ) December 31, 2016 Less Than 12 Months 12 Months or More Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized Security Type Value Losses Value Losses Value Losses (In thousands) Residential MBS and CMOs: Agency MBS $ 149,281 $ (1,691 ) $ 122,902 $ (1,273 ) $ 272,183 $ (2,964 ) Agency CMOs 44,111 (416 ) 25,316 (81 ) 69,427 (497 ) Private label CMOs 49,067 (906 ) 30,155 (531 ) 79,222 (1,437 ) Municipal securities 644,424 (6,011 ) — — 644,424 (6,011 ) Agency commercial MBS 349,550 (9,658 ) — — 349,550 (9,658 ) Corporate debt securities 29,829 (271 ) — — 29,829 (271 ) Collateralized loan obligations 12,450 (37 ) 39,231 (201 ) 51,681 (238 ) SBA securities 69,293 (407 ) 39,024 (343 ) 108,317 (750 ) Asset-backed and other securities 18,213 (309 ) 7,851 (76 ) 26,064 (385 ) Total $ 1,366,218 $ (19,706 ) $ 264,479 $ (2,505 ) $ 1,630,697 $ (22,211 ) We reviewed the securities that were in an unrealized loss position at September 30, 2017 , and concluded their unrealized losses were a result of the level of market interest rates relative to the types of securities and pricing changes caused by shifting supply and demand dynamics and not a result of downgraded credit ratings or other indicators of deterioration of the underlying issuers' ability to repay. Accordingly, we determined the securities were temporarily impaired and we did not recognize such impairment in the condensed consolidated statements of earnings. Although we periodically sell securities for portfolio management purposes, we do not foresee having to sell any temporarily impaired securities strictly for liquidity needs and believe that it is more likely than not we would not be required to sell any temporarily impaired securities before recovery of their amortized cost. Contractual Maturities of Securities Available-for-Sale The following table presents the contractual maturities of our securities available-for-sale portfolio based on amortized cost and carrying value as of the date indicated: September 30, 2017 Amortized Fair Maturity Cost Value (In thousands) Due in one year or less $ 17,879 $ 18,352 Due after one year through five years 326,552 331,164 Due after five years through ten years 962,429 969,431 Due after ten years 2,168,647 2,213,283 Total securities available-for-sale $ 3,475,507 $ 3,532,230 Mortgage-backed securities have contractual terms to maturity, but require periodic payments to reduce principal. In addition, expected maturities may differ from contractual maturities because obligors and/or issuers may have the right to call or prepay obligations with or without call or prepayment penalties. Interest Income on Investment Securities The following table presents the composition of our interest income on investment securities for the periods indicated: Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, 2017 2017 2016 2017 2016 (In thousands) Taxable interest $ 13,576 $ 13,515 $ 11,446 $ 39,257 $ 34,248 Non-taxable interest 10,795 10,750 10,333 31,926 31,562 Dividend income 391 424 408 1,307 1,344 Total interest income on investment securities $ 24,762 $ 24,689 $ 22,187 $ 72,490 $ 67,154

Loans and Leases

Loans and Leases	9 Months Ended
	Sep. 30, 2017
Receivables [Abstract]
Loans and Leases	LOANS AND LEASES Our loan and lease portfolio includes originated and purchased loans and leases. Originated and purchased loans and leases for which there was no evidence of credit deterioration at their acquisition date and for which it was probable that we would be able to collect all contractually required payments, are referred to collectively as Non-PCI loans. Generally, PCI loans are purchased loans for which there was, at the acquisition date, evidence of credit deterioration since their origination and for which it was probable that collection of all contractually required payments was unlikely. Non-PCI loans are carried at the principal amount outstanding, net of deferred fees and costs, and in the case of acquired loans, net of purchase discounts and premiums. Deferred fees and costs and purchase discounts and premiums on acquired non-impaired loans are recognized as an adjustment to interest income over the contractual life of the loans primarily using the effective interest method or taken into income when the related loans are paid off or included in the carrying amount of loans that are sold. PCI loans are accounted for in accordance with ASC Subtopic 310‑30, “ Loans and Debt Securities Acquired with Deteriorated Credit Quality." For PCI loans, at the time of acquisition we (i) calculate the contractual amount and timing of undiscounted principal and interest payments (the "undiscounted contractual cash flows") and (ii) estimate the amount and timing of undiscounted expected principal and interest payments (the "undiscounted expected cash flows"). The difference between the undiscounted contractual cash flows and the undiscounted expected cash flows is the nonaccretable difference. The difference between the undiscounted cash flows expected to be collected and the estimated fair value of the acquired loans is the accretable yield. The nonaccretable difference represents an estimate of the loss exposure of principal and interest related to the PCI loan portfolio; such amount is subject to change over time based on the performance of such loans. The carrying value of PCI loans is reduced by payments received, both principal and interest, and increased by the portion of the accretable yield recognized as interest income. Loans Held for Sale In the second quarter of 2017, we entered into two agreements to sell loans with balances totaling $175.2 million and the associated unfunded commitments of $19.3 million , primarily from our healthcare portfolios. The $175.2 million of loans were reported as loans held for sale at June 30, 2017 and the sales were completed in July. In connection with the transfer of loans to held for sale, we recognized $7.2 million in charge-offs during the second quarter related to our healthcare portfolio loans in order to record the loans at the lower of cost or fair value. There were no loans held for sale at September 30, 2017. Loans and Leases Held for Investment The following table summarizes the composition of our loans and leases held for investment as of the dates indicated: September 30, 2017 December 31, 2016 Non-PCI Non-PCI Loans PCI Loans PCI and Leases Loans Total and Leases Loans Total (In thousands) Real estate mortgage $ 6,146,978 $ 58,077 $ 6,205,055 $ 5,635,675 $ 92,793 $ 5,728,468 Real estate construction and land 1,266,791 — 1,266,791 975,032 2,409 977,441 Commercial 7,894,115 4,194 7,898,309 8,426,236 12,994 8,439,230 Consumer 385,892 238 386,130 375,149 249 375,398 Total gross loans and leases held for investment 15,693,776 62,509 15,756,285 15,412,092 108,445 15,520,537 Deferred fees, net (65,753 ) (15 ) (65,768 ) (64,562 ) (21 ) (64,583 ) Total loans and leases held for investment, net of deferred fees 15,628,023 62,494 15,690,517 15,347,530 108,424 15,455,954 Allowance for loan and lease losses (152,770 ) (6,836 ) (159,606 ) (143,755 ) (13,483 ) (157,238 ) Total loans and leases held for investment, net $ 15,475,253 $ 55,658 $ 15,530,911 $ 15,203,775 $ 94,941 $ 15,298,716 Non‑PCI Loans and Leases Held for Investment The following tables present an aging analysis of our Non‑PCI loans and leases held for investment, net of deferred fees, by portfolio segment and class as of the dates indicated: September 30, 2017 30 - 89 90 or More Days Days Total Past Due Past Due Past Due Current Total (In thousands) Real estate mortgage: Commercial $ 1,685 $ 3,664 $ 5,349 $ 4,306,899 $ 4,312,248 Residential 282 1,740 2,022 1,816,926 1,818,948 Total real estate mortgage 1,967 5,404 7,371 6,123,825 6,131,196 Real estate construction and land: Commercial — — — 680,949 680,949 Residential — — — 568,273 568,273 Total real estate construction and land — — — 1,249,222 1,249,222 Commercial: Cash flow 140 1,484 1,624 2,728,771 2,730,395 Asset-based — — — 2,577,390 2,577,390 Venture capital 3,142 948 4,090 1,955,345 1,959,435 Equipment finance — 690 690 593,782 594,472 Total commercial 3,282 3,122 6,404 7,855,288 7,861,692 Consumer 286 272 558 385,355 385,913 Total $ 5,535 $ 8,798 $ 14,333 $ 15,613,690 $ 15,628,023 December 31, 2016 30 - 89 90 or More Days Days Total Past Due Past Due Past Due Current Total (In thousands) Real estate mortgage: Commercial $ 8,590 $ 3,303 $ 11,893 $ 4,341,740 $ 4,353,633 Residential 5,694 1,999 7,693 1,256,630 1,264,323 Total real estate mortgage 14,284 5,302 19,586 5,598,370 5,617,956 Real estate construction and land: Commercial — — — 578,838 578,838 Residential 364 — 364 383,637 384,001 Total real estate construction and land 364 — 364 962,475 962,839 Commercial: Cash flow 191 1,821 2,012 3,105,380 3,107,392 Asset-based 1,500 2 1,502 2,607,543 2,609,045 Venture capital 13,589 5,769 19,358 1,963,798 1,983,156 Equipment finance 1,417 3,051 4,468 687,499 691,967 Total commercial 16,697 10,643 27,340 8,364,220 8,391,560 Consumer 224 — 224 374,951 375,175 Total $ 31,569 $ 15,945 $ 47,514 $ 15,300,016 $ 15,347,530 It is our policy to discontinue accruing interest when principal or interest payments are past due 90 days or more unless the loan is both well secured and in the process of collection or when, in the opinion of management, there is a reasonable doubt as to the collectability of a loan or lease in the normal course of business. Interest income on nonaccrual loans is recognized only to the extent cash is received and the principal balance of the loan is deemed collectable. The following table presents our nonaccrual and performing Non‑PCI loans and leases held for investment, net of deferred fees, by portfolio segment and class as of the dates indicated: September 30, 2017 December 31, 2016 Nonaccrual Performing Total Nonaccrual Performing Total (In thousands) Real estate mortgage: Commercial $ 63,096 $ 4,249,152 $ 4,312,248 $ 62,454 $ 4,291,179 $ 4,353,633 Residential 3,186 1,815,762 1,818,948 6,881 1,257,442 1,264,323 Total real estate mortgage 66,282 6,064,914 6,131,196 69,335 5,548,621 5,617,956 Real estate construction and land: Commercial — 680,949 680,949 — 578,838 578,838 Residential — 568,273 568,273 364 383,637 384,001 Total real estate construction and land — 1,249,222 1,249,222 364 962,475 962,839 Commercial: Cash flow 33,514 2,696,881 2,730,395 53,908 3,053,484 3,107,392 Asset-based 3,977 2,573,413 2,577,390 2,118 2,606,927 2,609,045 Venture capital 22,686 1,936,749 1,959,435 11,687 1,971,469 1,983,156 Equipment finance 30,942 563,530 594,472 32,848 659,119 691,967 Total commercial 91,119 7,770,573 7,861,692 100,561 8,290,999 8,391,560 Consumer 296 385,617 385,913 339 374,836 375,175 Total $ 157,697 $ 15,470,326 $ 15,628,023 $ 170,599 $ 15,176,931 $ 15,347,530 At September 30, 2017 , nonaccrual loans and leases totaled $157.7 million and included $8.8 million of loans and leases 90 or more days past due, $0.7 million of loans and leases 30 to 89 days past due, and $148.2 million of loans and leases current with respect to contractual payments that were placed on nonaccrual status based on management’s judgment regarding their collectability. Nonaccrual loans and leases totaled $170.6 million at December 31, 2016 , including $15.9 million of the loans and leases 90 or more days past due, $3.0 million of loans and leases 30 to 89 days past due, and $151.7 million of current loans and leases that were placed on nonaccrual status based on management’s judgment regarding their collectability. As of September 30, 2017 , our ten largest Non-PCI loan relationships on nonaccrual status had an aggregate carrying value of $129.1 million and represented 81.9% of total Non-PCI nonaccrual loans and leases. The largest of these relationships consisted of a $45.5 million healthcare real estate loan secured by a continuing care retirement facility that migrated to nonaccrual status during the third quarter of 2016 due to weak operating performance and cash flow difficulties. The following table presents the credit risk rating categories for Non‑PCI loans and leases held for investment, net of deferred fees, by portfolio segment and class as of the dates indicated. Nonclassified loans and leases are those with a credit risk rating of either pass or special mention, while classified loans and leases are those with a credit risk rating of either substandard or doubtful. September 30, 2017 December 31, 2016 Classified Nonclassified Total Classified Nonclassified Total (In thousands) Real estate mortgage: Commercial $ 95,272 $ 4,216,976 $ 4,312,248 $ 99,641 $ 4,253,992 $ 4,353,633 Residential 7,652 1,811,296 1,818,948 17,540 1,246,783 1,264,323 Total real estate mortgage 102,924 6,028,272 6,131,196 117,181 5,500,775 5,617,956 Real estate construction and land: Commercial — 680,949 680,949 409 578,429 578,838 Residential — 568,273 568,273 364 383,637 384,001 Total real estate construction and land — 1,249,222 1,249,222 773 962,066 962,839 Commercial: Cash flow 128,207 2,602,188 2,730,395 177,661 2,929,731 3,107,392 Asset-based 19,645 2,557,745 2,577,390 28,112 2,580,933 2,609,045 Venture capital 62,602 1,896,833 1,959,435 52,646 1,930,510 1,983,156 Equipment finance 30,942 563,530 594,472 32,848 659,119 691,967 Total commercial 241,396 7,620,296 7,861,692 291,267 8,100,293 8,391,560 Consumer 457 385,456 385,913 424 374,751 375,175 Total $ 344,777 $ 15,283,246 $ 15,628,023 $ 409,645 $ 14,937,885 $ 15,347,530 In addition to our internal risk rating process, our federal and state banking regulators, as an integral part of their examination process, periodically review the Company’s loan and lease risk rating classifications. Our regulators may require the Company to recognize rating downgrades based on their judgments related to information available to them at the time of their examinations. Risk rating downgrades generally result in increases in the provisions for credit losses and the allowance for credit losses. Non‑PCI nonaccrual loans and leases and performing troubled debt restructured loans are considered impaired for reporting purposes. Troubled debt restructurings are a result of rate reductions, term extensions, fee concessions, and debt forgiveness, or a combination thereof. The following table presents the composition of our impaired loans and leases held for investment, net of deferred fees, by portfolio segment as of the dates indicated: September 30, 2017 December 31, 2016 Performing Total Performing Total Nonaccrual Troubled Impaired Nonaccrual Troubled Impaired Loans Debt Loans Loans Debt Loans and Restructured and and Restructured and Leases Loans Leases Leases Loans Leases (In thousands) Real estate mortgage $ 66,282 $ 47,473 $ 113,755 $ 69,335 $ 54,750 $ 124,085 Real estate construction and land — 5,764 5,764 364 6,893 7,257 Commercial 91,119 3,209 94,328 100,561 3,157 103,718 Consumer 296 106 402 339 152 491 Total $ 157,697 $ 56,552 $ 214,249 $ 170,599 $ 64,952 $ 235,551 The following tables present information regarding our Non‑PCI impaired loans and leases held for investment, net of deferred fees, by portfolio segment and class as of and for the dates indicated: September 30, 2017 December 31, 2016 Unpaid Unpaid Recorded Principal Related Recorded Principal Related Impaired Loans and Leases Investment Balance Allowance Investment Balance Allowance (In thousands) With An Allowance Recorded: Real estate mortgage: Commercial $ 14,716 $ 15,536 $ 682 $ 63,325 $ 65,031 $ 6,266 Residential 3,074 3,269 471 8,424 8,612 585 Real estate construction and land: Residential — — — 213 213 — Commercial: Cash flow 31,114 40,068 8,720 51,272 52,910 12,474 Asset-based 2,499 2,514 422 4,395 4,861 2,144 Venture capital 20,039 22,377 5,870 5,821 5,880 3,294 Equipment finance — — — 1,524 4,636 — Consumer 106 105 17 270 280 170 With No Related Allowance Recorded: Real estate mortgage: Commercial $ 92,295 $ 103,306 $ 44,557 $ 51,402 Residential 3,670 3,906 7,779 8,940 Real estate construction and land: Commercial 5,764 5,762 6,680 6,680 Residential — — 364 366 Commercial: Cash flow 2,559 4,690 2,852 5,939 Asset-based 4,528 6,479 664 1,652 Venture capital 2,647 6,741 5,866 8,939 Equipment finance 30,942 49,742 31,324 53,319 Consumer 296 368 221 292 Total Non-PCI Loans and Leases With and Without an Allowance Recorded: Real estate mortgage $ 113,755 $ 126,017 $ 1,153 $ 124,085 $ 133,985 $ 6,851 Real estate construction and land 5,764 5,762 — 7,257 7,259 — Commercial 94,328 132,611 15,012 103,718 138,136 17,912 Consumer 402 473 17 491 572 170 Total $ 214,249 $ 264,863 $ 16,182 $ 235,551 $ 279,952 $ 24,933 Three Months Ended September 30, 2017 2016 Weighted Interest Weighted Interest Average Income Average Income Impaired Loans and Leases Balance (1) Recognized Balance (1) Recognized (In thousands) With An Allowance Recorded: Real estate mortgage: Commercial $ 14,716 $ 214 $ 18,580 $ 262 Residential 3,074 14 2,505 15 Real estate construction and land: Residential — — 736 4 Commercial: Cash flow 31,114 2 25,933 9 Asset-based 2,372 29 2,730 5 Venture capital 18,298 — 6,878 — Equipment finance — — 42,913 — Consumer 106 2 346 3 With No Related Allowance Recorded: Real estate mortgage: Commercial $ 92,183 $ 635 $ 59,090 $ 518 Residential 3,670 15 9,573 70 Real estate construction and land: Commercial 5,764 74 7,870 57 Commercial: Cash flow 2,338 11 2,330 1 Asset-based 1,501 29 2,535 37 Venture capital 2,647 — — — Equipment finance 30,942 — — — Consumer 296 — 76 — Total Non-PCI Loans and Leases With and Without an Allowance Recorded: Real estate mortgage $ 113,643 $ 878 $ 89,748 $ 865 Real estate construction and land 5,764 74 8,606 61 Commercial 89,212 71 83,319 52 Consumer 402 2 422 3 Total $ 209,021 $ 1,025 $ 182,095 $ 981 _________________________ (1) For Non-PCI loans and leases reported as impaired at September 30, 2017 and 2016 , amounts were calculated based on the period of time such loans and leases were impaired during the reported period. Nine Months Ended September 30, 2017 2016 Weighted Interest Weighted Interest Average Income Average Income Impaired Loans and Leases Balance (1) Recognized Balance (1) Recognized (In thousands) With An Allowance Recorded: Real estate mortgage: Commercial $ 14,716 $ 634 $ 18,220 $ 781 Residential 3,074 41 2,325 42 Real estate construction and land: Residential — — 736 11 Commercial: Cash flow 31,114 5 20,417 26 Asset-based 2,079 83 2,278 14 Venture capital 9,621 — 2,542 — Equipment finance — — 41,587 — Consumer 106 6 330 8 With No Related Allowance Recorded: Real estate mortgage: Commercial $ 90,631 $ 1,924 $ 54,747 $ 1,209 Residential 3,650 44 6,990 130 Real estate construction and land: Commercial 5,764 220 7,106 169 Commercial: Cash flow 1,995 14 2,232 1 Asset-based 1,171 54 1,828 77 Venture capital 1,922 — — — Equipment finance 30,560 — — — Consumer 296 — 74 1 Total Non-PCI Loans and Leases With and Without an Allowance Recorded: Real estate mortgage $ 112,071 $ 2,643 $ 82,282 $ 2,162 Real estate construction and land 5,764 220 7,842 180 Commercial 78,462 156 70,884 118 Consumer 402 6 404 9 Total $ 196,699 $ 3,025 $ 161,412 $ 2,469 _________________________ (1) For Non-PCI loans and leases reported as impaired at September 30, 2017 and 2016 , amounts were calculated based on the period of time such loans and leases were impaired during the reported period. The following tables present our troubled debt restructurings of Non-PCI loans held for investment by portfolio segment and class for the periods indicated: Three Months Ended September 30, 2017 2016 Pre- Post- Pre- Post- Modification Modification Modification Modification Outstanding Outstanding Outstanding Outstanding Number Recorded Recorded Number Recorded Recorded Troubled Debt Restructurings of Loans Investment Investment of Loans Investment Investment (Dollars in thousands) Real estate mortgage: Commercial 1 $ 998 $ 998 2 $ 1,147 $ 1,147 Residential 3 566 10 1 93 93 Real estate construction and land: Commercial — — — 1 1,245 1,245 Commercial: Cash flow 3 9,491 255 2 25 25 Asset-based 2 2,655 2,655 1 25 25 Venture capital 4 15,308 15,308 — — — Equipment finance — — — 1 39,912 39,912 Consumer — — — 1 21 21 Total 13 $ 29,018 $ 19,226 9 $ 42,468 $ 42,468 Nine Months Ended September 30, 2017 2016 Pre- Post- Pre- Post- Modification Modification Modification Modification Outstanding Outstanding Outstanding Outstanding Number Recorded Recorded Number Recorded Recorded Troubled Debt Restructurings of Loans Investment Investment of Loans Investment Investment (Dollars in thousands) Real estate mortgage: Commercial 5 $ 2,527 $ 2,463 7 $ 5,287 $ 5,287 Residential 8 1,328 489 7 5,136 5,136 Real estate construction and land: Commercial — — — 1 1,245 1,245 Residential 1 362 — — — — Commercial: Cash flow 12 26,385 17,150 12 30,582 30,582 Asset-based 7 4,433 4,433 5 2,158 2,158 Venture capital 9 28,465 28,465 — — — Equipment finance — — — 7 44,196 42,572 Consumer 1 97 97 4 819 111 Total 43 $ 63,597 $ 53,097 43 $ 89,423 $ 87,091 The following tables present troubled debt restructurings of Non-PCI loans held for investment by portfolio segment and class that subsequently defaulted for the periods indicated: Three Months Ended September 30, 2017 2016 Troubled Debt Restructurings Number Recorded Number Recorded That Subsequently Defaulted of Loans Investment (1) of Loans Investment (1) (Dollars in thousands) Real estate construction and land: Commercial — $ — 1 $ 1,245 Commercial: Asset-based — — 1 2 Total — $ — 2 $ 1,247 (2) _________________________ (1) The population of defaulted restructured loans for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the 12-month period ended September 30, 2017 , the population of defaulted restructured loans includes only those loans restructured after September 30, 2016 . The table excludes defaulted troubled restructurings in those classes for which the recorded investment was zero at the end of the period. (2) Represents the balance at September 30, 2016 , and there were no charge-offs. Nine Months Ended September 30, 2017 2016 Troubled Debt Restructurings Number Recorded Number Recorded That Subsequently Defaulted of Loans Investment (1) of Loans Investment (1) (Dollars in thousands) Real estate construction and land: Commercial — $ — 1 $ 1,245 Commercial: Asset-based — — 1 2 Equipment finance — — 1 39,912 (3) Total — $ — 3 $ 41,159 (2) _________________________ (1) The population of defaulted restructured loans for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the 12-month period ended September 30, 2017 , the population of defaulted restructured loans includes only those loans restructured after September 30, 2016 . The table excludes defaulted troubled restructurings in those classes for which the recorded investment was zero at the end of the period. (2) Represents the balance at September 30, 2016 , and there were no charge-offs. (3) The term of the modification for this loan expired in the second quarter of 2016 and was not renewed until the third quarter of 2016. Thus, the loan was in payment default under the loan's original terms at June 30, 2016. The modified terms were extended an additional six months in April 2017. Allowance for Loan and Lease Losses The following tables present a summary of the activity in the allowance for loan and lease losses on Non‑PCI loans and leases held for investment by portfolio segment and PCI loans held for investment for the periods indicated: Three Months Ended September 30, 2017 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 37,122 $ 11,318 $ 88,364 $ 2,075 $ 138,879 $ 7,079 $ 145,958 Charge-offs (531 ) — (4,984 ) (413 ) (5,928 ) (79 ) (6,007 ) Recoveries 36 353 4,447 29 4,865 217 5,082 Provision (negative provision) (186 ) 22 14,366 752 14,954 (381 ) 14,573 Balance, end of period $ 36,441 $ 11,693 $ 102,193 $ 2,443 $ 152,770 $ 6,836 $ 159,606 Nine Months Ended September 30, 2017 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 37,765 $ 10,045 $ 93,853 $ 2,092 $ 143,755 $ 13,483 $ 157,238 Charge-offs (2,217 ) — (46,965 ) (625 ) (49,807 ) (5,768 ) (55,575 ) Recoveries 286 370 8,848 104 9,608 275 9,883 Provision (negative provision) 607 1,278 46,457 872 49,214 (1,154 ) 48,060 Balance, end of period $ 36,441 $ 11,693 $ 102,193 $ 2,443 $ 152,770 $ 6,836 $ 159,606 Ending Allowance by Impairment Methodology: Individually evaluated for impairment $ 1,153 $ — $ 15,012 $ 17 $ 16,182 Collectively evaluated for impairment $ 35,288 $ 11,693 $ 87,181 $ 2,426 $ 136,588 Acquired loans with deteriorated credit quality $ 6,836 Ending Loans and Leases by Impairment Methodology: Individually evaluated for impairment $ 113,304 $ 5,764 $ 94,078 $ 106 $ 213,252 Collectively evaluated for impairment 6,017,892 1,243,458 7,767,614 385,807 15,414,771 Acquired loans with deteriorated credit quality $ 62,494 Ending balance $ 6,131,196 $ 1,249,222 $ 7,861,692 $ 385,913 $ 15,628,023 $ 62,494 $ 15,690,517 Three Months Ended September 30, 2016 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 29,331 $ 7,853 $ 93,404 $ 1,412 $ 132,000 $ 11,289 $ 143,289 Charge-offs (302 ) — (9,606 ) (16 ) (9,924 ) (531 ) (10,455 ) Recoveries 2,414 27 3,553 56 6,050 — 6,050 Provision 5,498 803 2,240 80 8,621 471 9,092 Balance, end of period $ 36,941 $ 8,683 $ 89,591 $ 1,532 $ 136,747 $ 11,229 $ 147,976 Nine Months Ended September 30, 2016 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 36,654 $ 7,137 $ 61,082 $ 661 $ 105,534 $ 9,577 $ 115,111 Charge-offs (1,905 ) — (14,306 ) (798 ) (17,009 ) (862 ) (17,871 ) Recoveries 4,352 185 4,179 95 8,811 — 8,811 Provision (negative provision) (2,160 ) 1,361 38,636 1,574 39,411 2,514 41,925 Balance, end of period $ 36,941 $ 8,683 $ 89,591 $ 1,532 $ 136,747 $ 11,229 $ 147,976 Ending Allowance by Impairment Methodology: Individually evaluated for impairment $ 7,299 $ 11 $ 23,631 $ 179 $ 31,120 Collectively evaluated for impairment $ 29,642 $ 8,672 $ 65,960 $ 1,353 $ 105,627 Acquired loans with deteriorated credit quality $ 11,229 Ending Loans and Leases by Impairment Methodology: Individually evaluated for impairment $ 139,059 $ 8,700 $ 92,637 $ 376 $ 240,772 Collectively evaluated for impairment 5,325,882 822,815 7,977,050 256,128 14,381,875 Acquired loans with deteriorated credit quality $ 120,199 Ending balance $ 5,464,941 $ 831,515 $ 8,069,687 $ 256,504 $ 14,622,647 $ 120,199 $ 14,742,846 Allowance for Credit Losses The Non-PCI allowance for credit losses is the combination of the Non-PCI allowance for loan and lease losses and the Non-PCI reserve for unfunded loan commitments. The Non-PCI reserve for unfunded loan commitments is included within "Accrued interest payable and other liabilities" on the condensed consolidated balance sheets. The following tables present a summary of the activity in the Non-PCI allowance for loan and lease losses, Non-PCI reserve for unfunded loan commitments, and PCI allowance for loan losses for the periods indicated: Three Months Ended September 30, 2017 Non-PCI Allowance for Reserve for PCI Total Loan and Unfunded Loan Allowance for Allowance for Allowance for Lease Losses Commitments Credit Losses Loan Losses Credit Losses (In thousands) Balance, beginning of period $ 138,879 $ 20,263 $ 159,142 $ 7,079 $ 166,221 Charge-offs (5,928 ) — (5,928 ) (79 ) (6,007 ) Recoveries 4,865 — 4,865 217 5,082 Net charge-offs (1,063 ) — (1,063 ) 138 (925 ) Provision (negative provision) 14,954 546 15,500 (381 ) 15,119 Balance, end of period $ 152,770 $ 20,809 $ 173,579 $ 6,836 $ 180,415 Nine Months Ended September 30, 2017 Non-PCI Allowance for Reserve for PCI Total Loan and Unfunded Loan Allowance for Allowance for Allowance for Lease Losses Commitments Credit Losses Loan Losses Credit Losses (In thousands) Balance, beginning of period $ 143,755 $ 17,523 $ 161,278 $ 13,483 $ 174,761 Charge-offs (49,807 ) — (49,807 ) (5,768 ) (55,575 ) Recoveries 9,608 — 9,608 275 9,883 Net charge-offs (40,199 ) — (40,199 ) (5,493 ) (45,692 ) Provision (negative provision) 49,214 3,286 52,500 (1,154 ) 51,346 Balance, end of period $ 152,770 $ 20,809 $ 173,579 $ 6,836 $ 180,415 Three Months Ended September 30, 2016 Non-PCI Allowance for Reserve for PCI Total Loan and Unfunded Loan Allowance for Allowance for Allowance for Lease Losses Commitments Credit Losses Loan Losses Credit Losses (In thousands) Balance, beginning of period $ 132,000 $ 17,944 $ 149,944 $ 11,289 $ 161,233 Charge-offs (9,924 ) — (9,924 ) (531 ) (10,455 ) Recoveries 6,050 — 6,050 — 6,050 Net charge-offs (3,874 ) — (3,874 ) (531 ) (4,405 ) Provision (negative provision) 8,621 (621 ) 8,000 471 8,471 Balance, end of period $ 136,747 $ 17,323 $ 154,070 $ 11,229 $ 165,299 Nine Months Ended September 30, 2016 Non-PCI Allowance for Reserve for PCI Total Loan and Unfunded Loan Allowance for Allowance for Allowance for Lease Losses Commitments Credit Losses Loan Losses Credit Losses (In thousands) Balance, beginning of period $ 105,534 $ 16,734 $ 122,268 $ 9,577 $ 131,845 Charge-offs (17,009 ) — (17,009 ) (862 ) (17,871 ) Recoveries 8,811 — 8,811 — 8,811 Net charge-offs (8,198 ) — (8,198 ) (862 ) (9,060 ) Provision 39,411 589 40,000 2,514 42,514 Balance, end of period $ 136,747 $ 17,323 $ 154,070 $ 11,229 $ 165,299

Foreclosed Assets

Foreclosed Assets	9 Months Ended
	Sep. 30, 2017
Other Real Estate Owned Net Covered and NonCovered Including Foreclosed Assets [Abstract]
Foreclosed Assets	FORECLOSED ASSETS The following table summarizes foreclosed assets as of the dates indicated: September 30, December 31, Property Type 2017 2016 (In thousands) Construction and land development $ 9,319 $ 11,224 Multi‑family — 652 Commercial real estate 65 — Single family residence 1,668 — Total other real estate owned, net 11,052 11,876 Other foreclosed assets 578 1,100 Total foreclosed assets, net $ 11,630 $ 12,976 The following table presents the changes in foreclosed assets, net of the valuation allowance, for the period indicated: Foreclosed Assets (In thousands) Balance, December 31, 2016 $ 12,976 Transfers to foreclosed assets from loans 580 Other additions 1,385 Provision for losses (2,138 ) Reductions related to sales (1,173 ) Balance, September 30, 2017 $ 11,630

Borrowings and Subordinated Deb

Borrowings and Subordinated Debentures	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Borrowings and Subordinated Debentures	BORROWINGS AND SUBORDINATED DEBENTURES Borrowings The following table summarizes our borrowings as of the dates indicated: September 30, 2017 December 31, 2016 Weighted Weighted Average Average Amount Rate Amount Rate (Dollars in thousands) Non‑recourse debt $ 399 6.82 % $ 812 6.41 % FHLB secured advances 115,000 1.14 % 735,000 0.59 % FHLB unsecured overnight advance 135,000 1.15 % 130,000 0.55 % AFX borrowings — — % 40,000 0.81 % Total borrowings $ 250,399 $ 905,812 The non‑recourse debt represents the payment stream of certain equipment leases sold to third parties. The debt is secured by the leased equipment and all interest rates are fixed. As of September 30, 2017 , this debt had a weighted average remaining maturity of 1.9 years. The Bank has established secured and unsecured lines of credit under which it may borrow funds from time to time on a term or overnight basis from the FHLB, the FRBSF, and other financial institutions. FHLB Secured Line of Credit. The Bank had secured financing capacity with the FHLB as of September 30, 2017 of $3.0 billion , collateralized by a blanket lien on $4.4 billion of certain qualifying loans not pledged to the FRBSF. As of September 30, 2017 , the balance outstanding was a $115.0 million overnight advance. As of December 31, 2016 , the balance outstanding was $735.0 million , which consisted of a $435.0 million overnight advance and a $300.0 million one-month advance with a January 23, 2017 maturity date. FRBSF Secured Line of Credit. The Bank has a secured line of credit with the FRBSF. As of September 30, 2017 , the Bank had secured borrowing capacity of $2.2 billion collateralized by liens covering $2.9 billion of certain qualifying loans. As of September 30, 2017 and December 31, 2016 , there were no balances outstanding. FHLB Unsecured Line of Credit. The Bank has a $135.0 million unsecured line of credit with the FHLB for the purchase of overnight funds, of which $135.0 million was outstanding at September 30, 2017 . At December 31, 2016 , the balance outstanding was $130.0 million . Federal Funds Arrangements with Commercial Banks. As of September 30, 2017 , the Bank had unsecured lines of credit of $75.0 million with correspondent banks for the purchase of overnight funds, subject to availability of funds. These lines are renewable annually and have no unused commitment fees. As of September 30, 2017 and December 31, 2016 , there were no balances outstanding. The Bank is a member of the AFX, through which it may either borrow or lend funds on an overnight or short-term basis with a group of pre-approved commercial banks. The availability of funds changes daily. As of September 30, 2017 , there was no balance outstanding. At December 31, 2016 , the balance outstanding was $40.0 million , which consisted of a $26.0 million overnight borrowing and a $14.0 million one-month borrowing with a January 20, 2017 maturity date. Subordinated Debentures The following table summarizes the terms of each issuance of subordinated debentures outstanding as of the dates indicated: September 30, 2017 December 31, 2016 Date Maturity Rate Index Series Amount Rate Amount Rate Issued Date (Quarterly Reset) (Dollars in thousands) Trust V $ 10,310 4.42 % $ 10,310 4.09 % 8/15/2003 9/17/2033 3 month LIBOR + 3.10 Trust VI 10,310 4.37 % 10,310 4.01 % 9/3/2003 9/15/2033 3 month LIBOR + 3.05 Trust CII 5,155 4.27 % 5,155 3.95 % 9/17/2003 9/17/2033 3 month LIBOR + 2.95 Trust VII 61,856 4.06 % 61,856 3.64 % 2/5/2004 4/23/2034 3 month LIBOR + 2.75 Trust CIII 20,619 3.01 % 20,619 2.65 % 8/15/2005 9/15/2035 3 month LIBOR + 1.69 Trust FCCI 16,495 2.92 % 16,495 2.56 % 1/25/2007 3/15/2037 3 month LIBOR + 1.60 Trust FCBI 10,310 2.87 % 10,310 2.51 % 9/30/2005 12/15/2035 3 month LIBOR + 1.55 Trust CS 2005-1 82,475 3.27 % 82,475 2.91 % 11/21/2005 12/15/2035 3 month LIBOR + 1.95 Trust CS 2005-2 128,866 3.26 % 128,866 2.84 % 12/14/2005 1/30/2036 3 month LIBOR + 1.95 Trust CS 2006-1 51,545 3.26 % 51,545 2.84 % 2/22/2006 4/30/2036 3 month LIBOR + 1.95 Trust CS 2006-2 51,550 3.26 % 51,550 2.84 % 9/27/2006 10/30/2036 3 month LIBOR + 1.95 Trust CS 2006-3 (1) 30,422 1.72 % 27,185 1.74 % 9/29/2006 10/30/2036 3 month EURIBOR + 2.05 Trust CS 2006-4 16,470 3.26 % 16,470 2.84 % 12/5/2006 1/30/2037 3 month LIBOR + 1.95 Trust CS 2006-5 6,650 3.26 % 6,650 2.84 % 12/19/2006 1/30/2037 3 month LIBOR + 1.95 Trust CS 2007-2 39,177 3.26 % 39,177 2.84 % 6/13/2007 7/30/2037 3 month LIBOR + 1.95 Gross subordinated debentures 542,210 538,973 Unamortized discount (2) (94,084 ) (98,229 ) Net subordinated debentures $ 448,126 $ 440,744 ___________________ (1) Denomination is in Euros with a value of €25.8 million . (2) Amount represents the fair value adjustment on subordinated debentures assumed in acquisitions. Interest payments made by the Company on subordinated debentures are considered dividend payments under FRB regulations. Bank holding companies, such as PacWest, are required to notify the FRB prior to declaring and paying a dividend during any period in which quarterly and/or cumulative twelve‑month net earnings are insufficient to fund the dividend amount, among other requirements.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Lending Commitments The Company is a party to financial instruments with off‑balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit. Those instruments involve, to varying degrees, elements of credit risk in excess of the amount recognized in the condensed consolidated balance sheets. The contract or notional amounts of those instruments reflect the extent of involvement the Company has in particular classes of financial instruments. The following table presents a summary of the financial instruments described above as of the dates indicated: September 30, December 31, 2017 2016 (In thousands) Loan commitments to extend credit $ 5,037,084 $ 4,166,703 Standby letters of credit 237,052 211,398 Total $ 5,274,136 $ 4,378,101 Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The increase in loan commitments to extend credit is primarily a result of the continued growth of our construction and venture capital portfolios in 2017. Standby letters of credit are conditional commitments issued by the Company to guarantee the performance of a customer to a third party. We provide standby letters of credit in conjunction with several of our lending arrangements and property lease obligations. Most guarantees expire within one year from the date of issuance. If a borrower defaults on its commitments subject to any letter of credit issued under these arrangements, we would be required to meet the borrower's financial obligation but would seek repayment of that financial obligation from the borrower. In some cases, borrowers have pledged cash and investment securities as collateral with us under these arrangements. In addition, we invest in low income housing project partnerships, which provide income tax credits, and in small business investment companies that call for capital contributions up to an amount specified in the partnership agreements. As of September 30, 2017 and December 31, 2016 , we had commitments to contribute capital to these entities totaling $43.1 million and $26.6 million . We also had commitments to contribute up to an additional $2.5 million and $2.8 million to private equity funds at September 30, 2017 and December 31, 2016 . In addition, at September 30, 2017 , we had a commitment to purchase approximately $7.8 million of loans that terminates in June 2018. Legal Matters In the ordinary course of our business, the Company is party to various legal actions, which we believe are incidental to the operation of our business. The outcome of such legal actions and the timing of ultimate resolution are inherently difficult to predict. In the opinion of management, based upon currently available information, any resulting liability, in addition to amounts already accrued, and taking into consideration insurance which may be applicable, would not have a material adverse effect on the Company’s financial statements or operations. Kinde Durkee Investigation The United States Attorney's Office for the Eastern District of California concluded an investigation relating to the handling by First California Bank ("FCB") of its banking relationship with Kinde Durkee. Ms. Durkee, who had maintained certain of her accounts with FCB, was convicted in 2012 of embezzling funds from certain California politicians, among others. FCB, a wholly-owned subsidiary of FCAL, was acquired by PacWest Bancorp and merged into Pacific Western Bank in May 2013. The investigation was concluded in September 2017 with a cash settlement of $1.75 million . The claims settled are allegations only, and there has been no determination of liability. The settled claims relate exclusively to conduct by First California prior to its acquisition by PacWest Bancorp.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurements	FAIR VALUE MEASUREMENTS ASC Topic 820, “ Fair Value Measurement ,” defines fair value, establishes a framework for measuring fair value including a three‑level valuation hierarchy, and expands disclosures about fair value measurements. Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date reflecting assumptions that a market participant would use when pricing an asset or liability. The hierarchy uses three levels of inputs to measure the fair value of assets and liabilities as follows: • Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2: Observable inputs other than Level 1, including quoted prices for similar assets and liabilities in active markets, quoted prices in less active markets, or other observable inputs that can be corroborated by observable market data, either directly or indirectly, for substantially the full term of the financial instrument. This category generally includes municipal securities, agency residential and commercial MBS, collateralized loan obligations, registered publicly rated private label CMOs and asset-backed securitizations. • Level 3: Inputs to a valuation methodology that are unobservable, supported by little or no market activity, and significant to the fair value measurement. These valuation methodologies generally include pricing models, discounted cash flow models, or a determination of fair value that requires significant management judgment or estimation. This category also includes observable inputs from a pricing service not corroborated by observable market data, and includes our non-rated private label CMOs, non-rated private label asset-backed securities, and equity warrants. We use fair value to measure certain assets and liabilities on a recurring basis, primarily securities available‑for‑sale and derivatives. For assets measured at the lower of cost or fair value, the fair value measurement criteria may or may not be met during a reporting period and such measurements are therefore considered “nonrecurring” for purposes of disclosing our fair value measurements. Fair value is used on a nonrecurring basis to adjust carrying values for impaired loans and other real estate owned and also to record impairment on certain assets, such as goodwill, CDI, and other long‑lived assets. The following tables present information on the assets and liabilities measured and recorded at fair value on a recurring basis as of the dates indicated: Fair Value Measurements as of September 30, 2017 Measured on a Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Securities available‑for‑sale: Residential MBS and CMOs: Agency MBS $ 377,541 $ — $ 377,541 $ — Agency CMOs 175,950 — 175,950 — Private label CMOs 134,550 — 96,614 37,936 Municipal securities 1,549,150 — 1,549,150 — Agency commercial MBS 995,914 — 995,914 — Corporate debt securities 19,125 — 19,125 — Collateralized loan obligations 19,176 — 19,176 — SBA securities 168,028 — 168,028 — Asset-backed and other securities 92,796 4,808 45,603 42,385 Total securities available-for-sale 3,532,230 4,808 3,447,101 80,321 Equity warrants 5,158 — — 5,158 Other derivative assets 1,221 — 1,221 — Total recurring assets $ 3,538,609 $ 4,808 $ 3,448,322 $ 85,479 Derivative liabilities $ 564 $ — $ 564 $ — Fair Value Measurements as of December 31, 2016 Measured on a Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Securities available‑for‑sale: Residential MBS and CMOs: Agency MBS $ 502,443 $ — $ 502,443 $ — Agency CMOs 146,289 — 146,289 — Private label CMOs 125,469 — 68,567 56,902 Municipal securities 1,456,459 — 1,456,459 — Agency commercial MBS 547,692 — 547,692 — Corporate debt securities 47,509 — 47,509 — Collateralized loan obligations 156,887 — 156,887 — SBA securities 178,845 — 178,845 — Asset-backed and other securities 62,237 2,080 51,784 8,373 Total securities available-for-sale 3,223,830 2,080 3,156,475 65,275 Equity warrants 5,497 — — 5,497 Other derivative assets 694 — 694 — Total recurring assets $ 3,230,021 $ 2,080 $ 3,157,169 $ 70,772 Derivative liabilities $ 3,285 $ — $ 3,285 $ — During the nine months ended September 30, 2017 , there were no transfers of assets between Level 1 and Level 2, and there was a $0.7 million transfer of assets from Level 3 to Level 1 of the fair value hierarchy for assets measured on a recurring basis. The following table presents information about quantitative inputs and assumptions used to determine the fair values provided by our third party pricing service for our Level 3 private label CMOs and asset-backed securities available-for-sale measured at fair value on a recurring basis as of the date indicated: September 30, 2017 Private Label CMOs Asset-Backed Securities Weighted Weighted Range Average Range Average Unobservable Inputs of Inputs Input of Inputs Input Voluntary annual prepayment speeds 3.2% - 25.5% 9.6% 5% - 15% 13.5% Annual default rates 0.1% - 13.6% 2.2% 1% - 2% 1.8% Loss severity rates 4.0% - 95.9% 46.9% 10% - 60% 52.4% Discount rates 1.6% - 9.9% 4.6% 3.2% - 4.3% 3.6% The following table presents information about quantitative inputs and assumptions used in the modified Black-Scholes option pricing model to determine the fair value for our Level 3 equity warrants measured at fair value on a recurring basis as of the date indicated: September 30, 2017 Equity Warrants Weighted Average Unobservable Inputs Input Volatility 17.3% Risk-free interest rate 1.7% Remaining life assumption (in years) 3.8 The following table summarizes activity for our Level 3 private label CMOs available-for-sale, asset-backed securities available-for-sale, and equity warrants measured at fair value on a recurring basis for the period indicated: Private Asset-Backed Equity Label CMOs Securities Warrants (In thousands) Balance, December 31, 2016 $ 56,902 $ 8,373 $ 5,497 Total included in earnings 2,114 314 1,701 Total included in other comprehensive income (578 ) (349 ) — Purchases — 37,722 — Issuances — — 720 Sales (4,732 ) — (2,106 ) Net settlements (15,770 ) (3,675 ) — Transfers to securities available-for-sale — — (654 ) Balance, September 30, 2017 $ 37,936 $ 42,385 $ 5,158 The following tables present assets measured at fair value on a non‑recurring basis as of the dates indicated: Fair Value Measurement as of September 30, 2017 Measured on a Non‑Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Impaired Non‑PCI loans $ 63,463 $ — $ 6,779 $ 56,684 OREO 9,100 — 9,100 — Total non-recurring $ 72,563 $ — $ 15,879 $ 56,684 Fair Value Measurement as of December 31, 2016 Measured on a Non‑Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Impaired Non‑PCI loans $ 149,749 $ — $ 1,661 $ 148,088 OREO 11,224 — 11,224 — Investments carried at cost 242 — — 242 Total non-recurring $ 161,215 $ — $ 12,885 $ 148,330 The following table presents losses recognized on assets measured on a nonrecurring basis for the periods indicated: Three Months Ended Nine Months Ended Losses on Assets September 30, September 30, Measured on a Non‑Recurring Basis 2017 2016 2017 2016 (In thousands) Impaired Non‑PCI loans $ 4,427 $ 12,935 $ 17,895 $ 27,301 OREO 2,124 — 2,124 — Total losses $ 6,551 $ 12,935 $ 20,019 $ 27,301 The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a nonrecurring basis as of the date indicated: September 30, 2017 Valuation Unobservable Weighted Asset Fair Value Technique Inputs Range Average (In thousands) Impaired Non-PCI loans $ 55,365 Discounted cash flows Discount rates 2.00% - 8.93% 6.84% 1,319 Third party appraisals No discounts Total non-recurring Level 3 $ 56,684 ASC Topic 825, “ Financial Instruments ,” requires disclosure of the estimated fair value of certain financial instruments and the methods and significant assumptions used to estimate such fair values. Additionally, certain financial instruments and all nonfinancial instruments are excluded from the applicable disclosure requirements. The following tables present carrying amounts and estimated fair values of certain financial instruments as of the dates indicated: September 30, 2017 Carrying Estimated Fair Value Amount Total Level 1 Level 2 Level 3 ( In thousands ) Financial Assets: Cash and due from banks $ 147,579 $ 147,579 $ 147,579 $ — $ — Interest‑earning deposits in financial institutions 122,439 122,439 122,439 — — Securities available‑for‑sale 3,532,230 3,532,230 4,808 3,447,101 80,321 Investment in FHLB stock 17,250 17,250 — 17,250 — Investments carried at cost 1,006 10,702 — — 10,702 Loans and leases held for investment, net 15,530,911 15,700,815 — 6,779 15,694,036 Equity warrants 5,158 5,158 — — 5,158 Other derivative assets 1,221 1,221 — 1,221 — Financial Liabilities: Core deposits 13,531,300 13,531,300 — 13,531,300 — Non-core non-maturity deposits 1,118,694 1,118,694 — 1,118,694 — Time deposits 2,123,251 2,114,655 — 2,114,655 — Borrowings 250,399 250,399 250,000 399 — Subordinated debentures 448,126 431,173 — 431,173 — Derivative liabilities 564 564 — 564 — December 31, 2016 Carrying Estimated Fair Value Amount Total Level 1 Level 2 Level 3 ( In thousands ) Financial Assets: Cash and due from banks $ 337,965 $ 337,965 $ 337,965 $ — $ — Interest‑earning deposits in financial institutions 81,705 81,705 81,705 — — Securities available‑for‑sale 3,223,830 3,223,830 2,080 3,156,475 65,275 Investment in FHLB stock 21,870 21,870 — 21,870 — Investments carried at cost 1,416 3,843 — — 3,843 Loans and leases held for investment, net 15,298,716 15,494,808 — 1,661 15,493,147 Equity warrants 5,497 5,497 — — 5,497 Other derivative assets 694 694 — 694 — Financial Liabilities: Core deposits 12,523,834 12,523,834 — 12,523,834 — Non-core non-maturity deposits 1,174,487 1,174,487 — 1,174,487 — Time deposits 2,172,290 2,166,187 — 2,166,187 — Borrowings 905,812 905,838 591,000 314,838 — Subordinated debentures 440,744 424,507 — 424,507 — Derivative liabilities 3,285 3,285 — 3,285 — For information regarding the valuation methodologies used to measure our assets recorded at fair value (under ASC Topic 820), and for estimating fair value for financial instruments not recorded at fair value (under ASC Topic 825), see Note 1. Nature of Operations and Summary of Significant Accounting Policies, and Note 13. Fair Value Measurements, to the Consolidated Financial Statements of the Company's 2016 Annual Report on Form 10-K. Limitations Fair value estimates are made at a specific point in time and are based on relevant market information and information about the financial instrument. These estimates do not reflect income taxes or any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for a portion of the Company’s financial instruments, fair value estimates are based on what management believes to be reasonable judgments regarding expected future cash flows, current economic conditions, risk characteristics of various financial instruments, and other factors. These estimated fair values are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in assumptions could significantly affect the estimates. Since the fair values have been estimated as of September 30, 2017 , the amounts that will actually be realized or paid at settlement or maturity of the instruments could be significantly different.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	EARNINGS PER SHARE The following table presents the computations of basic and diluted net earnings per share for the periods indicated: Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, 2017 2017 2016 2017 2016 (Dollars in thousands, except per share data) Basic Earnings Per Share: Net earnings $ 101,466 $ 93,647 $ 93,895 $ 273,781 $ 266,519 Less: Earnings allocated to unvested restricted stock (1) (1,149 ) (1,080 ) (1,048 ) (3,239 ) (2,983 ) Net earnings allocated to common shares $ 100,317 $ 92,567 $ 92,847 $ 270,542 $ 263,536 Weighted-average basic shares and unvested restricted stock outstanding 121,447 121,422 121,818 121,405 121,739 Less: Weighted-average unvested restricted stock outstanding (1,394 ) (1,455 ) (1,401 ) (1,450 ) (1,425 ) Weighted-average basic shares outstanding 120,053 119,967 120,417 119,955 120,314 Basic earnings per share $ 0.84 $ 0.77 $ 0.77 $ 2.26 $ 2.19 Diluted Earnings Per Share: Net earnings allocated to common shares $ 100,317 $ 92,567 $ 92,847 $ 270,542 $ 263,536 Weighted-average basic shares outstanding 120,053 119,967 120,417 119,955 120,314 Diluted earnings per share $ 0.84 $ 0.77 $ 0.77 $ 2.26 $ 2.19 ________________________ (1) Represents cash dividends paid to holders of unvested restricted stock, net of forfeitures, plus undistributed earnings amounts available to holders of unvested restricted stock, if any.

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	STOCK-BASED COMPENSATION The Company’s 2017 Stock Incentive Plan, or the 2017 Plan, permits stock-based compensation awards to officers, directors, key employees and consultants. As of September 30, 2017 , the 2017 Plan authorized grants of stock‑based compensation instruments to purchase or issue up to 4,000,000 shares of Company common stock. As of September 30, 2017 , there were 3,837,850 shares available for grant under the 2017 Plan. Restricted Stock Restricted stock amortization totaled $6.5 million , $6.6 million , and $5.6 million for the three months ended September 30, 2017 , June 30, 2017 and September 30, 2016 and, $19.6 million and $16.6 million for the nine months ended September 30, 2017 and 2016 . Such amounts are included in "Compensation expense" on the condensed consolidated statements of earnings. The amount of unrecognized compensation expense related to unvested TRSAs and PRSUs as of September 30, 2017 totaled $47.5 million . Time-Based Restricted Stock Awards At September 30, 2017 , there were 1,393,874 shares of unvested TRSAs outstanding pursuant to the Company's 2003 and 2017 Stock Incentive Plans (the "Plans"). The TRSAs generally vest over a service period of three or four years from the date of the grant or immediately upon death of an employee. Compensation expense related to TRSAs is based on the fair value of the underlying stock on the award date and is recognized over the vesting period using the straight‑line method. Performance-Based Restricted Stock Units At September 30, 2017 , there were 239,025 unvested PRSUs outstanding. The PRSUs will vest only if performance goals with respect to certain financial metrics are met over a three -year performance period. The PRSUs are not considered issued and outstanding under the 2003 Stock Incentive Plan until they vest. PRSUs are granted and initially expensed based on a target number. The number of shares that will ultimately vest based on actual performance will range from zero to a maximum of either 150% or 200% of target. Compensation expense related to PRSUs is based on the fair value of the underlying stock on the award date and is amortized over the vesting period using the straight-line method unless it is determined that: (1) attainment of the financial metrics is less than probable, in which case a portion of the amortization is suspended, or (2) attainment of the financial metrics is improbable, in which case a portion of the previously recognized amortization is reversed and also suspended. If it is determined that attainment of a financial measure higher than target is probable, the amortization will increase to up to 150% or 200% of the target amortization amount. Annual PRSU expense may vary during the three -year performance period based upon changes in management's estimate of the number of shares that may ultimately vest. In the case where the performance target for the PRSU's is based on a market condition (such as total shareholder return), the amortization is neither reversed nor suspended if it is subsequently determined that the attainment of the performance target is less than probable or improbable.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	9 Months Ended
	Sep. 30, 2017
Recently Issued Accounting Standards [Abstract]
Recently Issued Accounting Standards	RECENTLY ISSUED ACCOUNTING STANDARDS In May 2014, the FASB issued ASU 2014-09, " Revenue Recognition (Topic 606): Revenue from Contracts with Customers." ASU 2014-09 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The standard permits the use of either the retrospective or cumulative effect transition method. In August 2015, the FASB issued ASU 2015-14, "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date," which deferred the effective date of ASU 2014-09 to annual and interim periods beginning after December 15, 2017. We have completed the assessment phase and substantially completed our implementation plan for adopting this new standard. In the assessment phase, we determined which revenue streams were within the scope and those that were excluded from the scope of the new standard. Substantially all of the Company's revenues, such as interest income, are excluded from the scope of the new standard. For the revenue streams determined to be within the scope of the new standard, we examined customer contracts to determine the appropriate accounting for those contracts under the new standard. We evaluated the need for any changes to our accounting, operations, and internal controls related to implementing the requirements of the new standard and have made some changes as needed. However, the new standard will not significantly impact the timing or amounts recognized. The Company will use the cumulative effect transition method and does not expect the provisions of ASU 2014-09 to have a material impact on our consolidated financial statements. The Company will adopt this standard effective January 1, 2018. In January 2016, the FASB issued ASU 2016-01, " Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ," which will significantly change the income statement impact of equity investments and the recognition of changes in fair value of financial liabilities when the fair value option is elected. For equity investments with readily determinable fair values, entities must measure these investments at fair value and recognize changes in fair value in net income. For equity investments without readily determinable fair values, entities have the option to either measure these investments at fair value or at cost, adjusted for changes in observable prices, minus impairment. Changes in measurement under either alternative must be recognized in net income. ASU 2016-01 will be effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted only for the provisions related to the recognition of changes in fair value of financial liabilities, which does not apply to the Company. The Company will adopt this standard effective January 1, 2018 and does not expect the provisions of ASU 2016-01 to have a material impact on its consolidated financial position or results of operations. In February 2016, the FASB issued ASU 2016-02, " Leases (Topic 842) ," which, among other things, requires lessees to recognize most leases on-balance sheet, which will result in an increase in their reported assets and liabilities. Lessor accounting remains substantially similar to current U.S. GAAP. ASU 2016-02 supersedes Topic 840, Leases . ASU 2016-02 is effective for annual and interim periods in fiscal years beginning after December 15, 2018 and mandates a modified retrospective transition method for all entities. The Company has begun to assess the impact of the new standard on its financial statements and related disclosures and is currently evaluating the existing lease portfolio and working through its implementation plan. The impact to the Company will be primarily related to leased branches and office space. The Company will adopt the standard effective January 1, 2019. In June 2016, the FASB issued ASU 2016-13, " Measurement of Credit Losses on Financial Instruments," which significantly changes the way entities recognize credit losses and impairment of many financial assets. Currently, the credit loss and impairment model is based on incurred losses, and investments are recognized as impaired when there is no longer an assumption that future cash flows will be collected in full under the originally contracted terms. Under the current expected credit loss ("CECL") model, the new standard requires immediate recognition of estimated credit losses expected to occur over the remaining life of the asset. The Company has set up a multidisciplinary project team, developed an implementation plan, selected a software solution, and has selected a third-party vendor to assist with the assessment phase of the project. ASU 2016-13 is effective for interim and annual periods in fiscal years beginning after December 15, 2019. The Company is evaluating the effect that ASU 2016-13 will have on its consolidated financial position or results of operations. In August 2016, the FASB issued ASU 2016-15, " Classification of Certain Cash Receipts and Cash Payments," which addressed eight issues related to the statement of cash flows, including proceeds from the settlement of BOLI policies. ASU 2016-15 is effective for interim and annual periods in fiscal years beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. If an entity early adopts ASU 2016-15 in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes the interim period. An entity that elects early adoption must adopt all of the amendment in the same period. Entities should apply ASU 2016-15 using a retrospective transition method to each period presented. If it is impracticable for an entity to apply ASU 2016-15 retrospectively for some of the issues, it may apply the amendments for those issues prospectively as of the earliest date practicable. ASU 2016-15 will result in some changes in classification in the consolidated statements of cash flows, which the Company does not expect will be significant, and will not have any impact on its consolidated financial position or results of operations. The Company will adopt this standard on January 1, 2018. In January 2017, the FASB issued ASU 2017-01, " Business Combinations (Topic 805): Clarifying the Definition of a Business ," which provides a new framework for determining whether transactions should be accounted for as acquisitions of assets or businesses. ASU 2017-01 is effective for annual periods in fiscal years beginning after December 15, 2018 and interim periods in fiscal years beginning after December 15, 2019. The Company does not expect ASU 2017-01 to have a material impact on its financial condition or results of operations. In January 2017, the FASB issued ASU 2017-04, " Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which intends to simplify goodwill impairment testing by eliminating the second step of the analysis under which the implied fair value of goodwill is determined as if the reporting unit were being acquired in a business combination. ASU 2017-04 instead requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit's fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. ASU 2017-04 must be applied prospectively and is effective for the Company on January 1, 2020. Early adoption is permitted. The Company does not expect ASU 2017-04 to have a material impact on its financial condition or results of operations. In May 2017, the FASB issued ASU 2017-09, " Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting ," which clarifies what constitutes a modification of a share-based payment award. ASU 2017-09 is effective for interim and annual periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. The Company will adopt this standard on January 1, 2018 and does not expect ASU 2017-09 to have a material impact on its financial condition or results of operations.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2017
Subsequent Events [Abstract]
Subsequent Events	SUBSEQUENT EVENTS CU Bancorp Acquisition On October 20, 2017, PacWest completed the acquisition of CU Bancorp ("CUB"). As part of the acquisition, California United Bank (“CU Bank”), a wholly-owned subsidiary of CUB, was merged with and into PacWest's wholly-owned banking subsidiary, Pacific Western Bank. Under the terms of the Agreement and Plan of Merger, each CUB common share, except dissenting shares, and each restricted stock award was converted into the right to receive 0.5308 of a share of PacWest common stock and $12.00 in cash, and each outstanding CUB stock option was settled in cash pursuant to terms of the Agreement and Plan of Merger. PacWest issued an aggregate of approximately 9.3 million shares of PacWest common stock and paid approximately $224 million in cash to CUB common shareholders and equity award holders. Based on the closing price of PacWest’s common stock on October 20, 2017 of $47.99 per share, the aggregate consideration paid to CUB common shareholders and equity awards holders was approximately $671 million. Former holders of CUB common stock as a group received shares of PacWest common stock in the acquisition constituting approximately 7% of the outstanding shares of PacWest common stock immediately after the acquisition. CU Bank was a commercial bank headquartered in Los Angeles, California. We completed the acquisition to, among other things, enhance our Southern California community bank franchise by adding a $2.1 billion loan portfolio and $2.7 billion of core deposits. Common Stock Dividends On November 1, 2017 , the Company announced that the Board of Directors had declared a quarterly cash dividend of $0.50 per common share. The cash dividend is payable on November 30, 2017 to stockholders of record at the close of business on November 20, 2017 . We have evaluated events that have occurred subsequent to September 30, 2017 and have concluded there are no other subsequent events that would require recognition in the accompanying consolidated financial statements.

Organization Organization (Poli

Organization Organization (Policies)	9 Months Ended
	Sep. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Recently Issued Accounting Standards	Accounting Standards Adopted in 2017 Effective January 1, 2017, the Company adopted ASU 2016-09, " Improvements to Employee Share-Based Accounting ." ASU 2016-09 changed aspects of the accounting for share-based payment award transactions, including: (1) accounting for income taxes; (2) classification of excess tax benefits on the statement of cash flows; (3) forfeitures; (4) minimum statutory tax withholding requirements; and (5) classification of employee taxes paid on the statement of cash flows when an employer withholds shares for tax-withholding purposes. The recognition of excess tax benefits and tax deficiencies in the income statement was adopted prospectively. Income tax benefits of $0.03 million and $1.5 million were recognized during the three and nine months ended September 30, 2017 as a result of the adoption of ASU 2016-09. We expect the requirements of ASU 2016-09 to result in fluctuations in our effective tax rate from period to period based upon the timing of share-based award vestings. In connection with the adoption of ASU 2016-09, we elected to recognize forfeitures on stock-based compensation awards when they occur, instead of estimating forfeitures at the grant date of the awards and throughout the vesting period. The modified retrospective application of this change in accounting principle resulted in a cumulative adjustment charge to retained earnings of $420,000 , net of income taxes. We elected to present the classification of excess tax benefits on the statement of cash flows using a prospective transition method and the prior period has not been adjusted. Effective July 1, 2017, the Company early-adopted ASU 2017-08, " Receivables - Nonrefundable Fees and Other Costs (Subtopic 210-20): Premium Amortization on Purchased Callable Debt Securities. " ASU 2017-08 requires certain premiums on callable debt securities to be amortized to the earliest call date. The amortization period for discounts on callable debt securities was not impacted. The adoption of this ASU had no material impact on the Company's consolidated financial position, results of operations, or cash flows. RECENTLY ISSUED ACCOUNTING STANDARDS In May 2014, the FASB issued ASU 2014-09, " Revenue Recognition (Topic 606): Revenue from Contracts with Customers." ASU 2014-09 requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 will replace most existing revenue recognition guidance in GAAP when it becomes effective. The standard permits the use of either the retrospective or cumulative effect transition method. In August 2015, the FASB issued ASU 2015-14, "Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date," which deferred the effective date of ASU 2014-09 to annual and interim periods beginning after December 15, 2017. We have completed the assessment phase and substantially completed our implementation plan for adopting this new standard. In the assessment phase, we determined which revenue streams were within the scope and those that were excluded from the scope of the new standard. Substantially all of the Company's revenues, such as interest income, are excluded from the scope of the new standard. For the revenue streams determined to be within the scope of the new standard, we examined customer contracts to determine the appropriate accounting for those contracts under the new standard. We evaluated the need for any changes to our accounting, operations, and internal controls related to implementing the requirements of the new standard and have made some changes as needed. However, the new standard will not significantly impact the timing or amounts recognized. The Company will use the cumulative effect transition method and does not expect the provisions of ASU 2014-09 to have a material impact on our consolidated financial statements. The Company will adopt this standard effective January 1, 2018. In January 2016, the FASB issued ASU 2016-01, " Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ," which will significantly change the income statement impact of equity investments and the recognition of changes in fair value of financial liabilities when the fair value option is elected. For equity investments with readily determinable fair values, entities must measure these investments at fair value and recognize changes in fair value in net income. For equity investments without readily determinable fair values, entities have the option to either measure these investments at fair value or at cost, adjusted for changes in observable prices, minus impairment. Changes in measurement under either alternative must be recognized in net income. ASU 2016-01 will be effective for annual and interim periods beginning after December 15, 2017. Early adoption is permitted only for the provisions related to the recognition of changes in fair value of financial liabilities, which does not apply to the Company. The Company will adopt this standard effective January 1, 2018 and does not expect the provisions of ASU 2016-01 to have a material impact on its consolidated financial position or results of operations. In February 2016, the FASB issued ASU 2016-02, " Leases (Topic 842) ," which, among other things, requires lessees to recognize most leases on-balance sheet, which will result in an increase in their reported assets and liabilities. Lessor accounting remains substantially similar to current U.S. GAAP. ASU 2016-02 supersedes Topic 840, Leases . ASU 2016-02 is effective for annual and interim periods in fiscal years beginning after December 15, 2018 and mandates a modified retrospective transition method for all entities. The Company has begun to assess the impact of the new standard on its financial statements and related disclosures and is currently evaluating the existing lease portfolio and working through its implementation plan. The impact to the Company will be primarily related to leased branches and office space. The Company will adopt the standard effective January 1, 2019. In June 2016, the FASB issued ASU 2016-13, " Measurement of Credit Losses on Financial Instruments," which significantly changes the way entities recognize credit losses and impairment of many financial assets. Currently, the credit loss and impairment model is based on incurred losses, and investments are recognized as impaired when there is no longer an assumption that future cash flows will be collected in full under the originally contracted terms. Under the current expected credit loss ("CECL") model, the new standard requires immediate recognition of estimated credit losses expected to occur over the remaining life of the asset. The Company has set up a multidisciplinary project team, developed an implementation plan, selected a software solution, and has selected a third-party vendor to assist with the assessment phase of the project. ASU 2016-13 is effective for interim and annual periods in fiscal years beginning after December 15, 2019. The Company is evaluating the effect that ASU 2016-13 will have on its consolidated financial position or results of operations. In August 2016, the FASB issued ASU 2016-15, " Classification of Certain Cash Receipts and Cash Payments," which addressed eight issues related to the statement of cash flows, including proceeds from the settlement of BOLI policies. ASU 2016-15 is effective for interim and annual periods in fiscal years beginning after December 15, 2017. Early adoption is permitted, including adoption in an interim period. If an entity early adopts ASU 2016-15 in an interim period, adjustments should be reflected as of the beginning of the fiscal year that includes the interim period. An entity that elects early adoption must adopt all of the amendment in the same period. Entities should apply ASU 2016-15 using a retrospective transition method to each period presented. If it is impracticable for an entity to apply ASU 2016-15 retrospectively for some of the issues, it may apply the amendments for those issues prospectively as of the earliest date practicable. ASU 2016-15 will result in some changes in classification in the consolidated statements of cash flows, which the Company does not expect will be significant, and will not have any impact on its consolidated financial position or results of operations. The Company will adopt this standard on January 1, 2018. In January 2017, the FASB issued ASU 2017-01, " Business Combinations (Topic 805): Clarifying the Definition of a Business ," which provides a new framework for determining whether transactions should be accounted for as acquisitions of assets or businesses. ASU 2017-01 is effective for annual periods in fiscal years beginning after December 15, 2018 and interim periods in fiscal years beginning after December 15, 2019. The Company does not expect ASU 2017-01 to have a material impact on its financial condition or results of operations. In January 2017, the FASB issued ASU 2017-04, " Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment," which intends to simplify goodwill impairment testing by eliminating the second step of the analysis under which the implied fair value of goodwill is determined as if the reporting unit were being acquired in a business combination. ASU 2017-04 instead requires entities to compare the fair value of a reporting unit with its carrying amount and recognize an impairment charge for any amount by which the carrying amount exceeds the reporting unit's fair value, to the extent that the loss recognized does not exceed the amount of goodwill allocated to that reporting unit. ASU 2017-04 must be applied prospectively and is effective for the Company on January 1, 2020. Early adoption is permitted. The Company does not expect ASU 2017-04 to have a material impact on its financial condition or results of operations. In May 2017, the FASB issued ASU 2017-09, " Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting ," which clarifies what constitutes a modification of a share-based payment award. ASU 2017-09 is effective for interim and annual periods in fiscal years beginning after December 15, 2017. Early adoption is permitted as of the beginning of an annual period for which financial statements (interim or annual) have not been issued or made available for issuance. The Company will adopt this standard on January 1, 2018 and does not expect ASU 2017-09 to have a material impact on its financial condition or results of operations.
Basis of Presentation	Basis of Presentation Our interim condensed consolidated financial statements are prepared in accordance with U.S. GAAP for interim financial information and pursuant to the requirements for reporting on Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934. Accordingly, certain disclosures accompanying annual consolidated financial statements are omitted. In the opinion of management, all significant intercompany accounts and transactions have been eliminated and adjustments, consisting solely of normal recurring accruals and considered necessary for the fair presentation of financial statements for the interim periods, have been included. The current period's results of operations are not necessarily indicative of the results that ultimately may be achieved for the year. The interim condensed consolidated financial statements and notes thereto should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Form 10-K.
Use of Estimates	Use of Estimates We have made a number of estimates and assumptions related to the reporting of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenue and expenses during the reporting period to prepare these condensed consolidated financial statements in conformity with U.S. GAAP. Actual results could differ from those estimates. Material estimates subject to change in the near term include, among other items, the allowance for credit losses, the carrying value of intangible assets, the realization of deferred tax assets, and the fair value estimates of assets acquired and liabilities assumed in acquisitions. These estimates may be adjusted as more current information becomes available, and any adjustment may be significant.
Reclassifications	Reclassifications Certain prior period amounts have been reclassified to conform to the current period’s presentation format. On the condensed consolidated statements of earnings, beginning with our June 30, 2017 results, we began presenting a new line for "Loan expense" as that category exceeded the disclosure materiality threshold, which previously had been included as part of "Other expense." Included in loan expense are costs related to servicing our loans including legal fees. Prior to 2017, time deposit disclosures were presented as: (1) under $100,000 , and (2) $100,000 or more. We are now using the current FDIC insurance limit of $250,000 and presenting the categories as: (1) $250,000 and under, and (2) over $250,000 .
Fair Value Measurement	FAIR VALUE MEASUREMENTS ASC Topic 820, “ Fair Value Measurement ,” defines fair value, establishes a framework for measuring fair value including a three‑level valuation hierarchy, and expands disclosures about fair value measurements. Fair value is defined as the exchange price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date reflecting assumptions that a market participant would use when pricing an asset or liability. The hierarchy uses three levels of inputs to measure the fair value of assets and liabilities as follows: • Level 1: Quoted prices (unadjusted) for identical assets or liabilities in active markets. • Level 2: Observable inputs other than Level 1, including quoted prices for similar assets and liabilities in active markets, quoted prices in less active markets, or other observable inputs that can be corroborated by observable market data, either directly or indirectly, for substantially the full term of the financial instrument. This category generally includes municipal securities, agency residential and commercial MBS, collateralized loan obligations, registered publicly rated private label CMOs and asset-backed securitizations. • Level 3: Inputs to a valuation methodology that are unobservable, supported by little or no market activity, and significant to the fair value measurement. These valuation methodologies generally include pricing models, discounted cash flow models, or a determination of fair value that requires significant management judgment or estimation. This category also includes observable inputs from a pricing service not corroborated by observable market data, and includes our non-rated private label CMOs, non-rated private label asset-backed securities, and equity warrants. We use fair value to measure certain assets and liabilities on a recurring basis, primarily securities available‑for‑sale and derivatives. For assets measured at the lower of cost or fair value, the fair value measurement criteria may or may not be met during a reporting period and such measurements are therefore considered “nonrecurring” for purposes of disclosing our fair value measurements. Fair value is used on a nonrecurring basis to adjust carrying values for impaired loans and other real estate owned and also to record impairment on certain assets, such as goodwill, CDI, and other long‑lived assets.

Goodwill and Other Intangible21

Goodwill and Other Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets disclosure	The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated: Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, 2017 2017 2016 2017 2016 (In thousands) Gross Amount of CDI and CRI: Balance, beginning of period $ 64,187 $ 64,187 $ 76,513 $ 64,187 $ 95,524 Fully amortized portion (2,190 ) — (2,811 ) (2,190 ) (20,122 ) Reduction due to sale of PWEF leasing unit — — — — (1,700 ) Balance, end of period 61,997 64,187 73,702 61,997 73,702 Accumulated Amortization: Balance, beginning of period (33,950 ) (30,885 ) (32,747 ) (27,821 ) (42,304 ) Amortization (3,049 ) (3,065 ) (4,224 ) (9,178 ) (13,341 ) Fully amortized portion 2,190 — 2,811 2,190 20,122 Reduction due to sale of PWEF leasing unit — — — — 1,363 Balance, end of period (34,809 ) (33,950 ) (34,160 ) (34,809 ) (34,160 ) Net CDI and CRI, end of period $ 27,188 $ 30,237 $ 39,542 $ 27,188 $ 39,542

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule of available-for-sale securities reconciliation	The following table presents amortized cost, gross unrealized gains and losses, and fair values of securities available-for-sale as of the dates indicated: September 30, 2017 December 31, 2016 Gross Gross Gross Gross Amortized Unrealized Unrealized Fair Amortized Unrealized Unrealized Fair Security Type Cost Gains Losses Value Cost Gains Losses Value (In thousands) Residential MBS and CMOs: Agency MBS $ 375,357 $ 4,569 $ (2,385 ) $ 377,541 $ 499,185 $ 6,222 $ (2,964 ) $ 502,443 Agency CMOs 175,429 1,655 (1,134 ) 175,950 145,258 1,528 (497 ) 146,289 Private label CMOs 131,149 4,001 (600 ) 134,550 122,707 4,199 (1,437 ) 125,469 Municipal securities 1,501,196 49,362 (1,408 ) 1,549,150 1,447,064 15,406 (6,011 ) 1,456,459 Agency commercial MBS 996,963 5,764 (6,813 ) 995,914 555,552 1,798 (9,658 ) 547,692 Corporate debt securities 17,000 2,125 — 19,125 47,100 680 (271 ) 47,509 Collateralized loan obligations 19,119 66 (9 ) 19,176 155,440 1,685 (238 ) 156,887 SBA securities 166,949 1,363 (284 ) 168,028 179,085 510 (750 ) 178,845 Asset-backed and other securities 92,345 804 (353 ) 92,796 62,264 358 (385 ) 62,237 Total $ 3,475,507 $ 69,709 $ (12,986 ) $ 3,532,230 $ 3,213,655 $ 32,386 $ (22,211 ) $ 3,223,830
Unrealized losses on investment securities	The following tables present the gross unrealized losses and fair values of securities available-for-sale that were in unrealized loss positions, for which other-than-temporary impairments have not been recognized in earnings, as of the dates indicated: September 30, 2017 Less Than 12 Months 12 Months or More Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized Security Type Value Losses Value Losses Value Losses (In thousands) Residential MBS and CMOs: Agency MBS $ 52,840 $ (271 ) $ 127,695 $ (2,114 ) $ 180,535 $ (2,385 ) Agency CMOs 55,606 (891 ) 18,436 (243 ) 74,042 (1,134 ) Private label CMOs 45,494 (386 ) 18,080 (214 ) 63,574 (600 ) Municipal securities 78,784 (329 ) 29,203 (1,079 ) 107,987 (1,408 ) Agency commercial MBS 338,883 (2,920 ) 106,766 (3,893 ) 445,649 (6,813 ) Collateralized loan obligations 7,162 (9 ) — — 7,162 (9 ) SBA securities 42,963 (284 ) — — 42,963 (284 ) Asset-backed and other securities 39,723 (295 ) 8,162 (58 ) 47,885 (353 ) Total $ 661,455 $ (5,385 ) $ 308,342 $ (7,601 ) $ 969,797 $ (12,986 ) December 31, 2016 Less Than 12 Months 12 Months or More Total Gross Gross Gross Fair Unrealized Fair Unrealized Fair Unrealized Security Type Value Losses Value Losses Value Losses (In thousands) Residential MBS and CMOs: Agency MBS $ 149,281 $ (1,691 ) $ 122,902 $ (1,273 ) $ 272,183 $ (2,964 ) Agency CMOs 44,111 (416 ) 25,316 (81 ) 69,427 (497 ) Private label CMOs 49,067 (906 ) 30,155 (531 ) 79,222 (1,437 ) Municipal securities 644,424 (6,011 ) — — 644,424 (6,011 ) Agency commercial MBS 349,550 (9,658 ) — — 349,550 (9,658 ) Corporate debt securities 29,829 (271 ) — — 29,829 (271 ) Collateralized loan obligations 12,450 (37 ) 39,231 (201 ) 51,681 (238 ) SBA securities 69,293 (407 ) 39,024 (343 ) 108,317 (750 ) Asset-backed and other securities 18,213 (309 ) 7,851 (76 ) 26,064 (385 ) Total $ 1,366,218 $ (19,706 ) $ 264,479 $ (2,505 ) $ 1,630,697 $ (22,211 )
Investments classified by contractual maturity date	The following table presents the contractual maturities of our securities available-for-sale portfolio based on amortized cost and carrying value as of the date indicated: September 30, 2017 Amortized Fair Maturity Cost Value (In thousands) Due in one year or less $ 17,879 $ 18,352 Due after one year through five years 326,552 331,164 Due after five years through ten years 962,429 969,431 Due after ten years 2,168,647 2,213,283 Total securities available-for-sale $ 3,475,507 $ 3,532,230
Investment income	The following table presents the composition of our interest income on investment securities for the periods indicated: Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, 2017 2017 2016 2017 2016 (In thousands) Taxable interest $ 13,576 $ 13,515 $ 11,446 $ 39,257 $ 34,248 Non-taxable interest 10,795 10,750 10,333 31,926 31,562 Dividend income 391 424 408 1,307 1,344 Total interest income on investment securities $ 24,762 $ 24,689 $ 22,187 $ 72,490 $ 67,154

Loans and Leases (Tables)

Loans and Leases (Tables)	9 Months Ended
	Sep. 30, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Schedule of composition of loans portfolio	The following table summarizes the composition of our loans and leases held for investment as of the dates indicated: September 30, 2017 December 31, 2016 Non-PCI Non-PCI Loans PCI Loans PCI and Leases Loans Total and Leases Loans Total (In thousands) Real estate mortgage $ 6,146,978 $ 58,077 $ 6,205,055 $ 5,635,675 $ 92,793 $ 5,728,468 Real estate construction and land 1,266,791 — 1,266,791 975,032 2,409 977,441 Commercial 7,894,115 4,194 7,898,309 8,426,236 12,994 8,439,230 Consumer 385,892 238 386,130 375,149 249 375,398 Total gross loans and leases held for investment 15,693,776 62,509 15,756,285 15,412,092 108,445 15,520,537 Deferred fees, net (65,753 ) (15 ) (65,768 ) (64,562 ) (21 ) (64,583 ) Total loans and leases held for investment, net of deferred fees 15,628,023 62,494 15,690,517 15,347,530 108,424 15,455,954 Allowance for loan and lease losses (152,770 ) (6,836 ) (159,606 ) (143,755 ) (13,483 ) (157,238 ) Total loans and leases held for investment, net $ 15,475,253 $ 55,658 $ 15,530,911 $ 15,203,775 $ 94,941 $ 15,298,716
Delinquent loans in loan portfolio	The following tables present an aging analysis of our Non‑PCI loans and leases held for investment, net of deferred fees, by portfolio segment and class as of the dates indicated: September 30, 2017 30 - 89 90 or More Days Days Total Past Due Past Due Past Due Current Total (In thousands) Real estate mortgage: Commercial $ 1,685 $ 3,664 $ 5,349 $ 4,306,899 $ 4,312,248 Residential 282 1,740 2,022 1,816,926 1,818,948 Total real estate mortgage 1,967 5,404 7,371 6,123,825 6,131,196 Real estate construction and land: Commercial — — — 680,949 680,949 Residential — — — 568,273 568,273 Total real estate construction and land — — — 1,249,222 1,249,222 Commercial: Cash flow 140 1,484 1,624 2,728,771 2,730,395 Asset-based — — — 2,577,390 2,577,390 Venture capital 3,142 948 4,090 1,955,345 1,959,435 Equipment finance — 690 690 593,782 594,472 Total commercial 3,282 3,122 6,404 7,855,288 7,861,692 Consumer 286 272 558 385,355 385,913 Total $ 5,535 $ 8,798 $ 14,333 $ 15,613,690 $ 15,628,023 December 31, 2016 30 - 89 90 or More Days Days Total Past Due Past Due Past Due Current Total (In thousands) Real estate mortgage: Commercial $ 8,590 $ 3,303 $ 11,893 $ 4,341,740 $ 4,353,633 Residential 5,694 1,999 7,693 1,256,630 1,264,323 Total real estate mortgage 14,284 5,302 19,586 5,598,370 5,617,956 Real estate construction and land: Commercial — — — 578,838 578,838 Residential 364 — 364 383,637 384,001 Total real estate construction and land 364 — 364 962,475 962,839 Commercial: Cash flow 191 1,821 2,012 3,105,380 3,107,392 Asset-based 1,500 2 1,502 2,607,543 2,609,045 Venture capital 13,589 5,769 19,358 1,963,798 1,983,156 Equipment finance 1,417 3,051 4,468 687,499 691,967 Total commercial 16,697 10,643 27,340 8,364,220 8,391,560 Consumer 224 — 224 374,951 375,175 Total $ 31,569 $ 15,945 $ 47,514 $ 15,300,016 $ 15,347,530
Schedule of non accrual and performing restructured impaired financing receivables	The following table presents the composition of our impaired loans and leases held for investment, net of deferred fees, by portfolio segment as of the dates indicated: September 30, 2017 December 31, 2016 Performing Total Performing Total Nonaccrual Troubled Impaired Nonaccrual Troubled Impaired Loans Debt Loans Loans Debt Loans and Restructured and and Restructured and Leases Loans Leases Leases Loans Leases (In thousands) Real estate mortgage $ 66,282 $ 47,473 $ 113,755 $ 69,335 $ 54,750 $ 124,085 Real estate construction and land — 5,764 5,764 364 6,893 7,257 Commercial 91,119 3,209 94,328 100,561 3,157 103,718 Consumer 296 106 402 339 152 491 Total $ 157,697 $ 56,552 $ 214,249 $ 170,599 $ 64,952 $ 235,551 The following table presents our nonaccrual and performing Non‑PCI loans and leases held for investment, net of deferred fees, by portfolio segment and class as of the dates indicated: September 30, 2017 December 31, 2016 Nonaccrual Performing Total Nonaccrual Performing Total (In thousands) Real estate mortgage: Commercial $ 63,096 $ 4,249,152 $ 4,312,248 $ 62,454 $ 4,291,179 $ 4,353,633 Residential 3,186 1,815,762 1,818,948 6,881 1,257,442 1,264,323 Total real estate mortgage 66,282 6,064,914 6,131,196 69,335 5,548,621 5,617,956 Real estate construction and land: Commercial — 680,949 680,949 — 578,838 578,838 Residential — 568,273 568,273 364 383,637 384,001 Total real estate construction and land — 1,249,222 1,249,222 364 962,475 962,839 Commercial: Cash flow 33,514 2,696,881 2,730,395 53,908 3,053,484 3,107,392 Asset-based 3,977 2,573,413 2,577,390 2,118 2,606,927 2,609,045 Venture capital 22,686 1,936,749 1,959,435 11,687 1,971,469 1,983,156 Equipment finance 30,942 563,530 594,472 32,848 659,119 691,967 Total commercial 91,119 7,770,573 7,861,692 100,561 8,290,999 8,391,560 Consumer 296 385,617 385,913 339 374,836 375,175 Total $ 157,697 $ 15,470,326 $ 15,628,023 $ 170,599 $ 15,176,931 $ 15,347,530
CV of loans held for investment by class by performing and nonperforming	The following table presents the credit risk rating categories for Non‑PCI loans and leases held for investment, net of deferred fees, by portfolio segment and class as of the dates indicated. Nonclassified loans and leases are those with a credit risk rating of either pass or special mention, while classified loans and leases are those with a credit risk rating of either substandard or doubtful. September 30, 2017 December 31, 2016 Classified Nonclassified Total Classified Nonclassified Total (In thousands) Real estate mortgage: Commercial $ 95,272 $ 4,216,976 $ 4,312,248 $ 99,641 $ 4,253,992 $ 4,353,633 Residential 7,652 1,811,296 1,818,948 17,540 1,246,783 1,264,323 Total real estate mortgage 102,924 6,028,272 6,131,196 117,181 5,500,775 5,617,956 Real estate construction and land: Commercial — 680,949 680,949 409 578,429 578,838 Residential — 568,273 568,273 364 383,637 384,001 Total real estate construction and land — 1,249,222 1,249,222 773 962,066 962,839 Commercial: Cash flow 128,207 2,602,188 2,730,395 177,661 2,929,731 3,107,392 Asset-based 19,645 2,557,745 2,577,390 28,112 2,580,933 2,609,045 Venture capital 62,602 1,896,833 1,959,435 52,646 1,930,510 1,983,156 Equipment finance 30,942 563,530 594,472 32,848 659,119 691,967 Total commercial 241,396 7,620,296 7,861,692 291,267 8,100,293 8,391,560 Consumer 457 385,456 385,913 424 374,751 375,175 Total $ 344,777 $ 15,283,246 $ 15,628,023 $ 409,645 $ 14,937,885 $ 15,347,530
Troubled debt restructurings on financing receivables	The following tables present our troubled debt restructurings of Non-PCI loans held for investment by portfolio segment and class for the periods indicated: Three Months Ended September 30, 2017 2016 Pre- Post- Pre- Post- Modification Modification Modification Modification Outstanding Outstanding Outstanding Outstanding Number Recorded Recorded Number Recorded Recorded Troubled Debt Restructurings of Loans Investment Investment of Loans Investment Investment (Dollars in thousands) Real estate mortgage: Commercial 1 $ 998 $ 998 2 $ 1,147 $ 1,147 Residential 3 566 10 1 93 93 Real estate construction and land: Commercial — — — 1 1,245 1,245 Commercial: Cash flow 3 9,491 255 2 25 25 Asset-based 2 2,655 2,655 1 25 25 Venture capital 4 15,308 15,308 — — — Equipment finance — — — 1 39,912 39,912 Consumer — — — 1 21 21 Total 13 $ 29,018 $ 19,226 9 $ 42,468 $ 42,468 Nine Months Ended September 30, 2017 2016 Pre- Post- Pre- Post- Modification Modification Modification Modification Outstanding Outstanding Outstanding Outstanding Number Recorded Recorded Number Recorded Recorded Troubled Debt Restructurings of Loans Investment Investment of Loans Investment Investment (Dollars in thousands) Real estate mortgage: Commercial 5 $ 2,527 $ 2,463 7 $ 5,287 $ 5,287 Residential 8 1,328 489 7 5,136 5,136 Real estate construction and land: Commercial — — — 1 1,245 1,245 Residential 1 362 — — — — Commercial: Cash flow 12 26,385 17,150 12 30,582 30,582 Asset-based 7 4,433 4,433 5 2,158 2,158 Venture capital 9 28,465 28,465 — — — Equipment finance — — — 7 44,196 42,572 Consumer 1 97 97 4 819 111 Total 43 $ 63,597 $ 53,097 43 $ 89,423 $ 87,091
Subsequently defaulted trouble debt restructurings	The following tables present troubled debt restructurings of Non-PCI loans held for investment by portfolio segment and class that subsequently defaulted for the periods indicated: Three Months Ended September 30, 2017 2016 Troubled Debt Restructurings Number Recorded Number Recorded That Subsequently Defaulted of Loans Investment (1) of Loans Investment (1) (Dollars in thousands) Real estate construction and land: Commercial — $ — 1 $ 1,245 Commercial: Asset-based — — 1 2 Total — $ — 2 $ 1,247 (2) _________________________ (1) The population of defaulted restructured loans for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the 12-month period ended September 30, 2017 , the population of defaulted restructured loans includes only those loans restructured after September 30, 2016 . The table excludes defaulted troubled restructurings in those classes for which the recorded investment was zero at the end of the period. (2) Represents the balance at September 30, 2016 , and there were no charge-offs. Nine Months Ended September 30, 2017 2016 Troubled Debt Restructurings Number Recorded Number Recorded That Subsequently Defaulted of Loans Investment (1) of Loans Investment (1) (Dollars in thousands) Real estate construction and land: Commercial — $ — 1 $ 1,245 Commercial: Asset-based — — 1 2 Equipment finance — — 1 39,912 (3) Total — $ — 3 $ 41,159 (2) _________________________ (1) The population of defaulted restructured loans for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the 12-month period ended September 30, 2017 , the population of defaulted restructured loans includes only those loans restructured after September 30, 2016 . The table excludes defaulted troubled restructurings in those classes for which the recorded investment was zero at the end of the period. (2) Represents the balance at September 30, 2016 , and there were no charge-offs. (3) The term of the modification for this loan expired in the second quarter of 2016 and was not renewed until the third quarter of 2016. Thus, the loan was in payment default under the loan's original terms at June 30, 2016. The modified terms were extended an additional six months in April 2017.
Allowance for credit losses on financing receivables	The following tables present a summary of the activity in the allowance for loan and lease losses on Non‑PCI loans and leases held for investment by portfolio segment and PCI loans held for investment for the periods indicated: Three Months Ended September 30, 2017 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 37,122 $ 11,318 $ 88,364 $ 2,075 $ 138,879 $ 7,079 $ 145,958 Charge-offs (531 ) — (4,984 ) (413 ) (5,928 ) (79 ) (6,007 ) Recoveries 36 353 4,447 29 4,865 217 5,082 Provision (negative provision) (186 ) 22 14,366 752 14,954 (381 ) 14,573 Balance, end of period $ 36,441 $ 11,693 $ 102,193 $ 2,443 $ 152,770 $ 6,836 $ 159,606 Nine Months Ended September 30, 2017 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 37,765 $ 10,045 $ 93,853 $ 2,092 $ 143,755 $ 13,483 $ 157,238 Charge-offs (2,217 ) — (46,965 ) (625 ) (49,807 ) (5,768 ) (55,575 ) Recoveries 286 370 8,848 104 9,608 275 9,883 Provision (negative provision) 607 1,278 46,457 872 49,214 (1,154 ) 48,060 Balance, end of period $ 36,441 $ 11,693 $ 102,193 $ 2,443 $ 152,770 $ 6,836 $ 159,606 Ending Allowance by Impairment Methodology: Individually evaluated for impairment $ 1,153 $ — $ 15,012 $ 17 $ 16,182 Collectively evaluated for impairment $ 35,288 $ 11,693 $ 87,181 $ 2,426 $ 136,588 Acquired loans with deteriorated credit quality $ 6,836 Ending Loans and Leases by Impairment Methodology: Individually evaluated for impairment $ 113,304 $ 5,764 $ 94,078 $ 106 $ 213,252 Collectively evaluated for impairment 6,017,892 1,243,458 7,767,614 385,807 15,414,771 Acquired loans with deteriorated credit quality $ 62,494 Ending balance $ 6,131,196 $ 1,249,222 $ 7,861,692 $ 385,913 $ 15,628,023 $ 62,494 $ 15,690,517 Three Months Ended September 30, 2016 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 29,331 $ 7,853 $ 93,404 $ 1,412 $ 132,000 $ 11,289 $ 143,289 Charge-offs (302 ) — (9,606 ) (16 ) (9,924 ) (531 ) (10,455 ) Recoveries 2,414 27 3,553 56 6,050 — 6,050 Provision 5,498 803 2,240 80 8,621 471 9,092 Balance, end of period $ 36,941 $ 8,683 $ 89,591 $ 1,532 $ 136,747 $ 11,229 $ 147,976 Nine Months Ended September 30, 2016 Real Estate Real Estate Construction Total Total Mortgage and Land Commercial Consumer Non-PCI PCI Total (In thousands) Allowance for Loan and Lease Losses: Balance, beginning of period $ 36,654 $ 7,137 $ 61,082 $ 661 $ 105,534 $ 9,577 $ 115,111 Charge-offs (1,905 ) — (14,306 ) (798 ) (17,009 ) (862 ) (17,871 ) Recoveries 4,352 185 4,179 95 8,811 — 8,811 Provision (negative provision) (2,160 ) 1,361 38,636 1,574 39,411 2,514 41,925 Balance, end of period $ 36,941 $ 8,683 $ 89,591 $ 1,532 $ 136,747 $ 11,229 $ 147,976 Ending Allowance by Impairment Methodology: Individually evaluated for impairment $ 7,299 $ 11 $ 23,631 $ 179 $ 31,120 Collectively evaluated for impairment $ 29,642 $ 8,672 $ 65,960 $ 1,353 $ 105,627 Acquired loans with deteriorated credit quality $ 11,229 Ending Loans and Leases by Impairment Methodology: Individually evaluated for impairment $ 139,059 $ 8,700 $ 92,637 $ 376 $ 240,772 Collectively evaluated for impairment 5,325,882 822,815 7,977,050 256,128 14,381,875 Acquired loans with deteriorated credit quality $ 120,199 Ending balance $ 5,464,941 $ 831,515 $ 8,069,687 $ 256,504 $ 14,622,647 $ 120,199 $ 14,742,846
Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivables, average balances and interest income recognized	The following tables present information regarding our Non‑PCI impaired loans and leases held for investment, net of deferred fees, by portfolio segment and class as of and for the dates indicated: September 30, 2017 December 31, 2016 Unpaid Unpaid Recorded Principal Related Recorded Principal Related Impaired Loans and Leases Investment Balance Allowance Investment Balance Allowance (In thousands) With An Allowance Recorded: Real estate mortgage: Commercial $ 14,716 $ 15,536 $ 682 $ 63,325 $ 65,031 $ 6,266 Residential 3,074 3,269 471 8,424 8,612 585 Real estate construction and land: Residential — — — 213 213 — Commercial: Cash flow 31,114 40,068 8,720 51,272 52,910 12,474 Asset-based 2,499 2,514 422 4,395 4,861 2,144 Venture capital 20,039 22,377 5,870 5,821 5,880 3,294 Equipment finance — — — 1,524 4,636 — Consumer 106 105 17 270 280 170 With No Related Allowance Recorded: Real estate mortgage: Commercial $ 92,295 $ 103,306 $ 44,557 $ 51,402 Residential 3,670 3,906 7,779 8,940 Real estate construction and land: Commercial 5,764 5,762 6,680 6,680 Residential — — 364 366 Commercial: Cash flow 2,559 4,690 2,852 5,939 Asset-based 4,528 6,479 664 1,652 Venture capital 2,647 6,741 5,866 8,939 Equipment finance 30,942 49,742 31,324 53,319 Consumer 296 368 221 292 Total Non-PCI Loans and Leases With and Without an Allowance Recorded: Real estate mortgage $ 113,755 $ 126,017 $ 1,153 $ 124,085 $ 133,985 $ 6,851 Real estate construction and land 5,764 5,762 — 7,257 7,259 — Commercial 94,328 132,611 15,012 103,718 138,136 17,912 Consumer 402 473 17 491 572 170 Total $ 214,249 $ 264,863 $ 16,182 $ 235,551 $ 279,952 $ 24,933 Three Months Ended September 30, 2017 2016 Weighted Interest Weighted Interest Average Income Average Income Impaired Loans and Leases Balance (1) Recognized Balance (1) Recognized (In thousands) With An Allowance Recorded: Real estate mortgage: Commercial $ 14,716 $ 214 $ 18,580 $ 262 Residential 3,074 14 2,505 15 Real estate construction and land: Residential — — 736 4 Commercial: Cash flow 31,114 2 25,933 9 Asset-based 2,372 29 2,730 5 Venture capital 18,298 — 6,878 — Equipment finance — — 42,913 — Consumer 106 2 346 3 With No Related Allowance Recorded: Real estate mortgage: Commercial $ 92,183 $ 635 $ 59,090 $ 518 Residential 3,670 15 9,573 70 Real estate construction and land: Commercial 5,764 74 7,870 57 Commercial: Cash flow 2,338 11 2,330 1 Asset-based 1,501 29 2,535 37 Venture capital 2,647 — — — Equipment finance 30,942 — — — Consumer 296 — 76 — Total Non-PCI Loans and Leases With and Without an Allowance Recorded: Real estate mortgage $ 113,643 $ 878 $ 89,748 $ 865 Real estate construction and land 5,764 74 8,606 61 Commercial 89,212 71 83,319 52 Consumer 402 2 422 3 Total $ 209,021 $ 1,025 $ 182,095 $ 981 _________________________ (1) For Non-PCI loans and leases reported as impaired at September 30, 2017 and 2016 , amounts were calculated based on the period of time such loans and leases were impaired during the reported period. Nine Months Ended September 30, 2017 2016 Weighted Interest Weighted Interest Average Income Average Income Impaired Loans and Leases Balance (1) Recognized Balance (1) Recognized (In thousands) With An Allowance Recorded: Real estate mortgage: Commercial $ 14,716 $ 634 $ 18,220 $ 781 Residential 3,074 41 2,325 42 Real estate construction and land: Residential — — 736 11 Commercial: Cash flow 31,114 5 20,417 26 Asset-based 2,079 83 2,278 14 Venture capital 9,621 — 2,542 — Equipment finance — — 41,587 — Consumer 106 6 330 8 With No Related Allowance Recorded: Real estate mortgage: Commercial $ 90,631 $ 1,924 $ 54,747 $ 1,209 Residential 3,650 44 6,990 130 Real estate construction and land: Commercial 5,764 220 7,106 169 Commercial: Cash flow 1,995 14 2,232 1 Asset-based 1,171 54 1,828 77 Venture capital 1,922 — — — Equipment finance 30,560 — — — Consumer 296 — 74 1 Total Non-PCI Loans and Leases With and Without an Allowance Recorded: Real estate mortgage $ 112,071 $ 2,643 $ 82,282 $ 2,162 Real estate construction and land 5,764 220 7,842 180 Commercial 78,462 156 70,884 118 Consumer 402 6 404 9 Total $ 196,699 $ 3,025 $ 161,412 $ 2,469 _________________________ (1) For Non-PCI loans and leases reported as impaired at September 30, 2017 and 2016 , amounts were calculated based on the period of time such loans and leases were impaired during the reported period.

Foreclosed Assets (Tables)

Foreclosed Assets (Tables)	9 Months Ended
	Sep. 30, 2017
Other Real Estate Owned Net Covered and NonCovered Including Foreclosed Assets [Abstract]
Other real estate and foreclosed assets	The following table summarizes foreclosed assets as of the dates indicated: September 30, December 31, Property Type 2017 2016 (In thousands) Construction and land development $ 9,319 $ 11,224 Multi‑family — 652 Commercial real estate 65 — Single family residence 1,668 — Total other real estate owned, net 11,052 11,876 Other foreclosed assets 578 1,100 Total foreclosed assets, net $ 11,630 $ 12,976
Other foreclosed assets rollforward	The following table presents the changes in foreclosed assets, net of the valuation allowance, for the period indicated: Foreclosed Assets (In thousands) Balance, December 31, 2016 $ 12,976 Transfers to foreclosed assets from loans 580 Other additions 1,385 Provision for losses (2,138 ) Reductions related to sales (1,173 ) Balance, September 30, 2017 $ 11,630

Borrowings and Subordinated D25

Borrowings and Subordinated Debentures (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of debt	The following table summarizes our borrowings as of the dates indicated: September 30, 2017 December 31, 2016 Weighted Weighted Average Average Amount Rate Amount Rate (Dollars in thousands) Non‑recourse debt $ 399 6.82 % $ 812 6.41 % FHLB secured advances 115,000 1.14 % 735,000 0.59 % FHLB unsecured overnight advance 135,000 1.15 % 130,000 0.55 % AFX borrowings — — % 40,000 0.81 % Total borrowings $ 250,399 $ 905,812
Borrowings subordinated debentures and brokered deposits disclosure	The following table summarizes the terms of each issuance of subordinated debentures outstanding as of the dates indicated: September 30, 2017 December 31, 2016 Date Maturity Rate Index Series Amount Rate Amount Rate Issued Date (Quarterly Reset) (Dollars in thousands) Trust V $ 10,310 4.42 % $ 10,310 4.09 % 8/15/2003 9/17/2033 3 month LIBOR + 3.10 Trust VI 10,310 4.37 % 10,310 4.01 % 9/3/2003 9/15/2033 3 month LIBOR + 3.05 Trust CII 5,155 4.27 % 5,155 3.95 % 9/17/2003 9/17/2033 3 month LIBOR + 2.95 Trust VII 61,856 4.06 % 61,856 3.64 % 2/5/2004 4/23/2034 3 month LIBOR + 2.75 Trust CIII 20,619 3.01 % 20,619 2.65 % 8/15/2005 9/15/2035 3 month LIBOR + 1.69 Trust FCCI 16,495 2.92 % 16,495 2.56 % 1/25/2007 3/15/2037 3 month LIBOR + 1.60 Trust FCBI 10,310 2.87 % 10,310 2.51 % 9/30/2005 12/15/2035 3 month LIBOR + 1.55 Trust CS 2005-1 82,475 3.27 % 82,475 2.91 % 11/21/2005 12/15/2035 3 month LIBOR + 1.95 Trust CS 2005-2 128,866 3.26 % 128,866 2.84 % 12/14/2005 1/30/2036 3 month LIBOR + 1.95 Trust CS 2006-1 51,545 3.26 % 51,545 2.84 % 2/22/2006 4/30/2036 3 month LIBOR + 1.95 Trust CS 2006-2 51,550 3.26 % 51,550 2.84 % 9/27/2006 10/30/2036 3 month LIBOR + 1.95 Trust CS 2006-3 (1) 30,422 1.72 % 27,185 1.74 % 9/29/2006 10/30/2036 3 month EURIBOR + 2.05 Trust CS 2006-4 16,470 3.26 % 16,470 2.84 % 12/5/2006 1/30/2037 3 month LIBOR + 1.95 Trust CS 2006-5 6,650 3.26 % 6,650 2.84 % 12/19/2006 1/30/2037 3 month LIBOR + 1.95 Trust CS 2007-2 39,177 3.26 % 39,177 2.84 % 6/13/2007 7/30/2037 3 month LIBOR + 1.95 Gross subordinated debentures 542,210 538,973 Unamortized discount (2) (94,084 ) (98,229 ) Net subordinated debentures $ 448,126 $ 440,744 ___________________ (1) Denomination is in Euros with a value of €25.8 million . (2) Amount represents the fair value adjustment on subordinated debentures assumed in acquisitions

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments disclosure	The following table presents a summary of the financial instruments described above as of the dates indicated: September 30, December 31, 2017 2016 (In thousands) Loan commitments to extend credit $ 5,037,084 $ 4,166,703 Standby letters of credit 237,052 211,398 Total $ 5,274,136 $ 4,378,101

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair value, assets measured on recurring basis	The following tables present information on the assets and liabilities measured and recorded at fair value on a recurring basis as of the dates indicated: Fair Value Measurements as of September 30, 2017 Measured on a Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Securities available‑for‑sale: Residential MBS and CMOs: Agency MBS $ 377,541 $ — $ 377,541 $ — Agency CMOs 175,950 — 175,950 — Private label CMOs 134,550 — 96,614 37,936 Municipal securities 1,549,150 — 1,549,150 — Agency commercial MBS 995,914 — 995,914 — Corporate debt securities 19,125 — 19,125 — Collateralized loan obligations 19,176 — 19,176 — SBA securities 168,028 — 168,028 — Asset-backed and other securities 92,796 4,808 45,603 42,385 Total securities available-for-sale 3,532,230 4,808 3,447,101 80,321 Equity warrants 5,158 — — 5,158 Other derivative assets 1,221 — 1,221 — Total recurring assets $ 3,538,609 $ 4,808 $ 3,448,322 $ 85,479 Derivative liabilities $ 564 $ — $ 564 $ — Fair Value Measurements as of December 31, 2016 Measured on a Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Securities available‑for‑sale: Residential MBS and CMOs: Agency MBS $ 502,443 $ — $ 502,443 $ — Agency CMOs 146,289 — 146,289 — Private label CMOs 125,469 — 68,567 56,902 Municipal securities 1,456,459 — 1,456,459 — Agency commercial MBS 547,692 — 547,692 — Corporate debt securities 47,509 — 47,509 — Collateralized loan obligations 156,887 — 156,887 — SBA securities 178,845 — 178,845 — Asset-backed and other securities 62,237 2,080 51,784 8,373 Total securities available-for-sale 3,223,830 2,080 3,156,475 65,275 Equity warrants 5,497 — — 5,497 Other derivative assets 694 — 694 — Total recurring assets $ 3,230,021 $ 2,080 $ 3,157,169 $ 70,772 Derivative liabilities $ 3,285 $ — $ 3,285 $ —
Fair value, assets and liabilities measured on nonrecurring basis, valuation techniques	The following table presents information about quantitative inputs and assumptions used to determine the fair values provided by our third party pricing service for our Level 3 private label CMOs and asset-backed securities available-for-sale measured at fair value on a recurring basis as of the date indicated: September 30, 2017 Private Label CMOs Asset-Backed Securities Weighted Weighted Range Average Range Average Unobservable Inputs of Inputs Input of Inputs Input Voluntary annual prepayment speeds 3.2% - 25.5% 9.6% 5% - 15% 13.5% Annual default rates 0.1% - 13.6% 2.2% 1% - 2% 1.8% Loss severity rates 4.0% - 95.9% 46.9% 10% - 60% 52.4% Discount rates 1.6% - 9.9% 4.6% 3.2% - 4.3% 3.6%
Fair value, quantitative inputs and assumptions used to determine fair value	The following table presents information about quantitative inputs and assumptions used in the modified Black-Scholes option pricing model to determine the fair value for our Level 3 equity warrants measured at fair value on a recurring basis as of the date indicated: September 30, 2017 Equity Warrants Weighted Average Unobservable Inputs Input Volatility 17.3% Risk-free interest rate 1.7% Remaining life assumption (in years) 3.8
Fair value, assets measured on recurring basis, significant unobservable inputs (level 3) reconciliation	The following table summarizes activity for our Level 3 private label CMOs available-for-sale, asset-backed securities available-for-sale, and equity warrants measured at fair value on a recurring basis for the period indicated: Private Asset-Backed Equity Label CMOs Securities Warrants (In thousands) Balance, December 31, 2016 $ 56,902 $ 8,373 $ 5,497 Total included in earnings 2,114 314 1,701 Total included in other comprehensive income (578 ) (349 ) — Purchases — 37,722 — Issuances — — 720 Sales (4,732 ) — (2,106 ) Net settlements (15,770 ) (3,675 ) — Transfers to securities available-for-sale — — (654 ) Balance, September 30, 2017 $ 37,936 $ 42,385 $ 5,158
Assets carried at fair value on a nonrecurring basis	The following tables present assets measured at fair value on a non‑recurring basis as of the dates indicated: Fair Value Measurement as of September 30, 2017 Measured on a Non‑Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Impaired Non‑PCI loans $ 63,463 $ — $ 6,779 $ 56,684 OREO 9,100 — 9,100 — Total non-recurring $ 72,563 $ — $ 15,879 $ 56,684 Fair Value Measurement as of December 31, 2016 Measured on a Non‑Recurring Basis Total Level 1 Level 2 Level 3 (In thousands) Impaired Non‑PCI loans $ 149,749 $ — $ 1,661 $ 148,088 OREO 11,224 — 11,224 — Investments carried at cost 242 — — 242 Total non-recurring $ 161,215 $ — $ 12,885 $ 148,330
Net losses (gains) on nonrecurring assets	The following table presents losses recognized on assets measured on a nonrecurring basis for the periods indicated: Three Months Ended Nine Months Ended Losses on Assets September 30, September 30, Measured on a Non‑Recurring Basis 2017 2016 2017 2016 (In thousands) Impaired Non‑PCI loans $ 4,427 $ 12,935 $ 17,895 $ 27,301 OREO 2,124 — 2,124 — Total losses $ 6,551 $ 12,935 $ 20,019 $ 27,301
Fair value inputs, assets, quantitative information	The following table presents the valuation methodology and unobservable inputs for Level 3 assets measured at fair value on a nonrecurring basis as of the date indicated: September 30, 2017 Valuation Unobservable Weighted Asset Fair Value Technique Inputs Range Average (In thousands) Impaired Non-PCI loans $ 55,365 Discounted cash flows Discount rates 2.00% - 8.93% 6.84% 1,319 Third party appraisals No discounts Total non-recurring Level 3 $ 56,684
Fair value, by balance sheet grouping	The following tables present carrying amounts and estimated fair values of certain financial instruments as of the dates indicated: September 30, 2017 Carrying Estimated Fair Value Amount Total Level 1 Level 2 Level 3 ( In thousands ) Financial Assets: Cash and due from banks $ 147,579 $ 147,579 $ 147,579 $ — $ — Interest‑earning deposits in financial institutions 122,439 122,439 122,439 — — Securities available‑for‑sale 3,532,230 3,532,230 4,808 3,447,101 80,321 Investment in FHLB stock 17,250 17,250 — 17,250 — Investments carried at cost 1,006 10,702 — — 10,702 Loans and leases held for investment, net 15,530,911 15,700,815 — 6,779 15,694,036 Equity warrants 5,158 5,158 — — 5,158 Other derivative assets 1,221 1,221 — 1,221 — Financial Liabilities: Core deposits 13,531,300 13,531,300 — 13,531,300 — Non-core non-maturity deposits 1,118,694 1,118,694 — 1,118,694 — Time deposits 2,123,251 2,114,655 — 2,114,655 — Borrowings 250,399 250,399 250,000 399 — Subordinated debentures 448,126 431,173 — 431,173 — Derivative liabilities 564 564 — 564 — December 31, 2016 Carrying Estimated Fair Value Amount Total Level 1 Level 2 Level 3 ( In thousands ) Financial Assets: Cash and due from banks $ 337,965 $ 337,965 $ 337,965 $ — $ — Interest‑earning deposits in financial institutions 81,705 81,705 81,705 — — Securities available‑for‑sale 3,223,830 3,223,830 2,080 3,156,475 65,275 Investment in FHLB stock 21,870 21,870 — 21,870 — Investments carried at cost 1,416 3,843 — — 3,843 Loans and leases held for investment, net 15,298,716 15,494,808 — 1,661 15,493,147 Equity warrants 5,497 5,497 — — 5,497 Other derivative assets 694 694 — 694 — Financial Liabilities: Core deposits 12,523,834 12,523,834 — 12,523,834 — Non-core non-maturity deposits 1,174,487 1,174,487 — 1,174,487 — Time deposits 2,172,290 2,166,187 — 2,166,187 — Borrowings 905,812 905,838 591,000 314,838 — Subordinated debentures 440,744 424,507 — 424,507 — Derivative liabilities 3,285 3,285 — 3,285 —

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income per share	The following table presents the computations of basic and diluted net earnings per share for the periods indicated: Three Months Ended Nine Months Ended September 30, June 30, September 30, September 30, 2017 2017 2016 2017 2016 (Dollars in thousands, except per share data) Basic Earnings Per Share: Net earnings $ 101,466 $ 93,647 $ 93,895 $ 273,781 $ 266,519 Less: Earnings allocated to unvested restricted stock (1) (1,149 ) (1,080 ) (1,048 ) (3,239 ) (2,983 ) Net earnings allocated to common shares $ 100,317 $ 92,567 $ 92,847 $ 270,542 $ 263,536 Weighted-average basic shares and unvested restricted stock outstanding 121,447 121,422 121,818 121,405 121,739 Less: Weighted-average unvested restricted stock outstanding (1,394 ) (1,455 ) (1,401 ) (1,450 ) (1,425 ) Weighted-average basic shares outstanding 120,053 119,967 120,417 119,955 120,314 Basic earnings per share $ 0.84 $ 0.77 $ 0.77 $ 2.26 $ 2.19 Diluted Earnings Per Share: Net earnings allocated to common shares $ 100,317 $ 92,567 $ 92,847 $ 270,542 $ 263,536 Weighted-average basic shares outstanding 120,053 119,967 120,417 119,955 120,314 Diluted earnings per share $ 0.84 $ 0.77 $ 0.77 $ 2.26 $ 2.19 ________________________ (1) Represents cash dividends paid to holders of unvested restricted stock, net of forfeitures, plus undistributed earnings amounts available to holders of unvested restricted stock, if any.

Organization (Details Textual)

Organization (Details Textual)	3 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)acquisitionbank_branch
Business Acquisition [Line Items]
Number of Businesses Acquired | acquisition		28
New accounting pronouncement for change in accounting principle effect of change of income taxes	$ 0	$ 1,500,000
FDIC Insurance Limits	250,000	250,000
Retained Earnings
Business Acquisition [Line Items]
Cumulative effect of change in accounting principle	420,000	420,000
New Policies [Member]
Business Acquisition [Line Items]
Time Deposits, Less Than $250,000	250,000	250,000
Time Deposits, $250,000 or More	250,000	250,000
Expired Policies [Member]
Business Acquisition [Line Items]
Time Deposits, Less than $100,000	100,000	100,000
Time Deposits, $100,000 or More	$ 100,000	$ 100,000
CALIFORNIA
Business Acquisition [Line Items]
Retail Branch Locations | bank_branch		74
NORTH CAROLINA
Business Acquisition [Line Items]
Retail Branch Locations | bank_branch		1

Goodwill and Other Intangible30

Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Finite-lived Intangible Assets [Roll Forward]
CDI and CRI Balance, beginning of period	$ 64,187		$ 76,513	$ 64,187	$ 95,524
Accumulated Amortization, beginning of period	(33,950)	$ (30,885)	(32,747)	(27,821)	(42,304)
Amortization	(3,049)	(3,065)	(4,224)	(9,178)	(13,341)
Fully amortized portion	2,190	0	2,811	2,190	20,122
Reduction due to sale of PWEF leasing unit	0	0	0	0	1,363
CDI and CRI Balance, end of period	61,997	64,187	73,702	61,997	73,702
Accumulated Amortization, end of period	(34,809)	(33,950)	(34,160)	(34,809)	(34,160)
Net CDI and CRI, end of period	27,188	30,237	39,542	27,188	39,542
CDI and CRI
Finite-lived Intangible Assets [Roll Forward]
Fully amortized portion	2,190	0	2,811	2,190	20,122
Reduction due to sale of PWEF leasing unit	$ 0	$ 0	$ 0	$ 0	$ (1,700)

Goodwill and Other Intangible31

Goodwill and Other Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life				56 months 7 days
Intangible asset amortization	$ 3,049	$ 3,065	$ 4,224	$ 9,178	$ 13,341
Aggregate amortization expense 2018	8,800			8,800
Aggregate amortization expense 2019	6,700			6,700
Aggregate amortization expense 2020	4,700			4,700
Aggregate amortization expense 2021	3,000			3,000
Aggregate amortization expense 2022	$ 1,700			$ 1,700
Scenario, Forecast
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization						$ 11,500

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	$ 3,475,507	$ 3,213,655
Available-for-sale Securities, Gross Unrealized Gain	69,709	32,386
Available-for-sale Securities, Gross Unrealized Loss	(12,986)	(22,211)
Securities available‑for‑sale	3,532,230	3,223,830
Government agency and government-sponsored enterprise pass through securities
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	375,357	499,185
Available-for-sale Securities, Gross Unrealized Gain	4,569	6,222
Available-for-sale Securities, Gross Unrealized Loss	(2,385)	(2,964)
Securities available‑for‑sale	377,541	502,443
Government agency and government-sponsored enterprise collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	175,429	145,258
Available-for-sale Securities, Gross Unrealized Gain	1,655	1,528
Available-for-sale Securities, Gross Unrealized Loss	(1,134)	(497)
Securities available‑for‑sale	175,950	146,289
Private label collateralized mortgage obligations
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	131,149	122,707
Available-for-sale Securities, Gross Unrealized Gain	4,001	4,199
Available-for-sale Securities, Gross Unrealized Loss	(600)	(1,437)
Securities available‑for‑sale	134,550	125,469
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	1,501,196	1,447,064
Available-for-sale Securities, Gross Unrealized Gain	49,362	15,406
Available-for-sale Securities, Gross Unrealized Loss	(1,408)	(6,011)
Securities available‑for‑sale	1,549,150	1,456,459
Government agency and government-sponsored enterprise commercial mortgage-backed securities
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	996,963	555,552
Available-for-sale Securities, Gross Unrealized Gain	5,764	1,798
Available-for-sale Securities, Gross Unrealized Loss	(6,813)	(9,658)
Securities available‑for‑sale	995,914	547,692
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	17,000	47,100
Available-for-sale Securities, Gross Unrealized Gain	2,125	680
Available-for-sale Securities, Gross Unrealized Loss	0	(271)
Securities available‑for‑sale	19,125	47,509
Collateralized loan obligations
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	19,119	155,440
Available-for-sale Securities, Gross Unrealized Gain	66	1,685
Available-for-sale Securities, Gross Unrealized Loss	(9)	(238)
Securities available‑for‑sale	19,176	156,887
SBA asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	166,949	179,085
Available-for-sale Securities, Gross Unrealized Gain	1,363	510
Available-for-sale Securities, Gross Unrealized Loss	(284)	(750)
Securities available‑for‑sale	168,028	178,845
Asset-backed and other securities
Schedule of Available-for-sale Securities [Line Items]
Total securities available-for-sale	92,345	62,264
Available-for-sale Securities, Gross Unrealized Gain	804	358
Available-for-sale Securities, Gross Unrealized Loss	(353)	(385)
Securities available‑for‑sale	$ 92,796	$ 62,237

Investment Securities (Details

Investment Securities (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	$ 661,455	$ 1,366,218
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(5,385)	(19,706)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	308,342	264,479
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(7,601)	(2,505)
Unrealized Losses on Securities Available-for-Sale, Fair Value	969,797	1,630,697
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(12,986)	(22,211)
Government agency and government-sponsored enterprise pass through securities
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	52,840	149,281
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(271)	(1,691)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	127,695	122,902
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(2,114)	(1,273)
Unrealized Losses on Securities Available-for-Sale, Fair Value	180,535	272,183
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(2,385)	(2,964)
Government agency and government-sponsored enterprise collateralized mortgage obligations
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	55,606	44,111
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(891)	(416)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	18,436	25,316
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(243)	(81)
Unrealized Losses on Securities Available-for-Sale, Fair Value	74,042	69,427
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(1,134)	(497)
Private label collateralized mortgage obligations
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	45,494	49,067
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(386)	(906)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	18,080	30,155
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(214)	(531)
Unrealized Losses on Securities Available-for-Sale, Fair Value	63,574	79,222
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(600)	(1,437)
Municipal securities
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	78,784	644,424
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(329)	(6,011)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	29,203	0
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(1,079)	0
Unrealized Losses on Securities Available-for-Sale, Fair Value	107,987	644,424
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(1,408)	(6,011)
Government agency and government-sponsored enterprise commercial mortgage-backed securities
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	338,883	349,550
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(2,920)	(9,658)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	106,766	0
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(3,893)	0
Unrealized Losses on Securities Available-for-Sale, Fair Value	445,649	349,550
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(6,813)	(9,658)
Corporate debt securities
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value		29,829
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses		(271)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value		0
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses		0
Unrealized Losses on Securities Available-for-Sale, Fair Value		29,829
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses		(271)
Collateralized loan obligations
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	7,162	12,450
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(9)	(37)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	0	39,231
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	0	(201)
Unrealized Losses on Securities Available-for-Sale, Fair Value	7,162	51,681
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(9)	(238)
SBA asset-backed securities
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	42,963	69,293
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(284)	(407)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	0	39,024
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	0	(343)
Unrealized Losses on Securities Available-for-Sale, Fair Value	42,963	108,317
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	(284)	(750)
Asset-backed and other securities
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Fair Value	39,723	18,213
Unrealized Losses on Securities Available-for-Sale, Less than 12 Months, Gross Unrealized Losses	(295)	(309)
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Fair Value	8,162	7,851
Unrealized Losses on Securities Available-for-Sale, 12 Months or Longer, Gross Unrealized Losses	(58)	(76)
Unrealized Losses on Securities Available-for-Sale, Fair Value	47,885	26,064
Unrealized Losses on Securities Available-for-Sale, Gross Unrealized Losses	$ (353)	$ (385)

Investment Securities (Detail34

Investment Securities (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Amortized Cost
Due in one year or less	$ 17,879
Due after one year through five years	326,552
Due after five years through ten years	962,429
Due after ten years	2,168,647
Total securities available-for-sale	3,475,507	$ 3,213,655
Fair Value
Due in one year or less	18,352
Due after one year through five years	331,164
Due after five years through ten years	969,431
Due after ten years	2,213,283
Total securities available-for-sale	$ 3,532,230	$ 3,223,830

Investment Securities (Detail35

Investment Securities (Details 3) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investments, Debt and Equity Securities [Abstract]
Taxable interest	$ 13,576	$ 13,515	$ 11,446	$ 39,257	$ 34,248
Non-taxable interest	10,795	10,750	10,333	31,926	31,562
Dividend income	391	424	408	1,307	1,344
Total interest income on investment securities	$ 24,762	$ 24,689	$ 22,187	$ 72,490	$ 67,154

Investment Securities (Detail36

Investment Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
AFS securities pledged as collateral	$ 339,800		$ 339,800
Proceeds from sales of securities available-for-sale			185,533	$ 392,841
Gross realized gains on sale of securities	1,300	$ 1,000	3,300	10,600
Gross realized losses on sale of securities	(100)	(600)	(500)	(1,600)
Available-for-sale Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sales of securities available-for-sale	$ 98,300	$ 39,100	$ 182,700	$ 383,900

Loans and Leases (Details)

Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	$ 15,756,285		$ 15,520,537
Deferred fees, net	(65,768)		(64,583)
Loans held for investment, net	15,690,517		15,455,954
Allowance for loan and lease losses	(159,606)		(157,238)
Total loans and leases held for investment, net	15,530,911		15,298,716
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	15,693,776		15,412,092
Deferred fees, net	(65,753)		(64,562)
Loans held for investment, net	15,628,023		15,347,530	$ 14,622,647
Allowance for loan and lease losses	(152,770)	$ (138,879)	(143,755)	(136,747)	$ (132,000)	$ (105,534)
Total loans and leases held for investment, net	15,475,253		15,203,775
Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	62,509		108,445
Deferred fees, net	(15)		(21)
Loans held for investment, net	62,494		108,424	120,199
Allowance for loan and lease losses	(6,836)		(13,483)
Total loans and leases held for investment, net	55,658		94,941
NonPCI and PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases held for investment, net			15,298,716
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	6,146,978		5,635,675
Loans held for investment, net	6,131,196		5,617,956	5,464,941
Allowance for loan and lease losses	(36,441)	(37,122)	(37,765)	(36,941)	(29,331)	(36,654)
Real Estate Mortgage | Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	58,077		92,793
Real Estate Mortgage | NonPCI and PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	6,205,055		5,728,468
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	1,266,791		975,032
Loans held for investment, net	1,249,222		962,839	831,515
Allowance for loan and lease losses	(11,693)	(11,318)	(10,045)	(8,683)	(7,853)	(7,137)
Real Estate Construction and Land | Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	0		2,409
Real Estate Construction and Land | NonPCI and PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	1,266,791		977,441
Commercial | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	7,894,115		8,426,236
Loans held for investment, net	7,861,692		8,391,560	8,069,687
Allowance for loan and lease losses	(102,193)	(88,364)	(93,853)	(89,591)	(93,404)	(61,082)
Commercial | Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	4,194		12,994
Commercial | NonPCI and PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	7,898,309		8,439,230
Consumer | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	385,892		375,149
Loans held for investment, net	385,913		375,175	256,504
Allowance for loan and lease losses	(2,443)	$ (2,075)	(2,092)	$ (1,532)	$ (1,412)	$ (661)
Consumer | Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	238		249
Consumer | NonPCI and PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Gross loans and leases held for investment	$ 386,130		$ 375,398

Loans and Leases (Details 1)

Loans and Leases (Details 1) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Delinquent loans in loan portfolio
30-89 Days Past Due	$ 700	$ 3,000
90 or More Days Past Due	8,800	15,900
Loans held for investment, net	15,690,517	15,455,954
Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	5,535	31,569
90 or More Days Past Due	8,798	15,945
Total Past Due	14,333	47,514
Current	15,613,690	15,300,016
Loans held for investment, net	15,628,023	15,347,530	$ 14,622,647
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	1,967	14,284
90 or More Days Past Due	5,404	5,302
Total Past Due	7,371	19,586
Current	6,123,825	5,598,370
Loans held for investment, net	6,131,196	5,617,956	5,464,941
Real Estate Mortgage | Commercial real estate | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	1,685	8,590
90 or More Days Past Due	3,664	3,303
Total Past Due	5,349	11,893
Current	4,306,899	4,341,740
Loans held for investment, net	4,312,248	4,353,633
Real Estate Mortgage | Residential Real Estate | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	282	5,694
90 or More Days Past Due	1,740	1,999
Total Past Due	2,022	7,693
Current	1,816,926	1,256,630
Loans held for investment, net	1,818,948	1,264,323
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	0	364
90 or More Days Past Due	0	0
Total Past Due	0	364
Current	1,249,222	962,475
Loans held for investment, net	1,249,222	962,839	831,515
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	0	0
90 or More Days Past Due	0	0
Total Past Due	0	0
Current	680,949	578,838
Loans held for investment, net	680,949	578,838
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	0	364
90 or More Days Past Due	0	0
Total Past Due	0	364
Current	568,273	383,637
Loans held for investment, net	568,273	384,001
Commercial | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	3,282	16,697
90 or More Days Past Due	3,122	10,643
Total Past Due	6,404	27,340
Current	7,855,288	8,364,220
Loans held for investment, net	7,861,692	8,391,560	8,069,687
Commercial | Cash Flow | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	140	191
90 or More Days Past Due	1,484	1,821
Total Past Due	1,624	2,012
Current	2,728,771	3,105,380
Loans held for investment, net	2,730,395	3,107,392
Commercial | Asset Based | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	0	1,500
90 or More Days Past Due	0	2
Total Past Due	0	1,502
Current	2,577,390	2,607,543
Loans held for investment, net	2,577,390	2,609,045
Commercial | Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	3,142	13,589
90 or More Days Past Due	948	5,769
Total Past Due	4,090	19,358
Current	1,955,345	1,963,798
Loans held for investment, net	1,959,435	1,983,156
Commercial | Equipment Finance Commercial Financing Receivable | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	0	1,417
90 or More Days Past Due	690	3,051
Total Past Due	690	4,468
Current	593,782	687,499
Loans held for investment, net	594,472	691,967
Consumer | Non Purchased Credit Impaired Loans and Leases
Delinquent loans in loan portfolio
30-89 Days Past Due	286	224
90 or More Days Past Due	272	0
Total Past Due	558	224
Current	385,355	374,951
Loans held for investment, net	$ 385,913	$ 375,175	$ 256,504

Loans and Leases (Details 2)

Loans and Leases (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Impaired [Line Items]
Nonaccrual	$ 157,697	$ 170,599
Loans held for investment	15,690,517	15,455,954
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	157,697	170,599
Loans held for investment	15,628,023	15,347,530	$ 14,622,647
Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	15,470,326	15,176,931
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	66,282	69,335
Loans held for investment	6,131,196	5,617,956	5,464,941
Real Estate Mortgage | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	6,064,914	5,548,621
Real Estate Mortgage | Commercial real estate | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	63,096	62,454
Loans held for investment	4,312,248	4,353,633
Real Estate Mortgage | Commercial real estate | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	4,249,152	4,291,179
Real Estate Mortgage | Residential Real Estate | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	3,186	6,881
Loans held for investment	1,818,948	1,264,323
Real Estate Mortgage | Residential Real Estate | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	1,815,762	1,257,442
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	364
Loans held for investment	1,249,222	962,839	831,515
Real Estate Construction and Land | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	1,249,222	962,475
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0
Loans held for investment	680,949	578,838
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	680,949	578,838
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	364
Loans held for investment	568,273	384,001
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	568,273	383,637
Commercial | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	91,119	100,561
Loans held for investment	7,861,692	8,391,560	8,069,687
Commercial | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	7,770,573	8,290,999
Commercial | Cash Flow | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	33,514	53,908
Loans held for investment	2,730,395	3,107,392
Commercial | Cash Flow | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	2,696,881	3,053,484
Commercial | Asset Based | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	3,977	2,118
Loans held for investment	2,577,390	2,609,045
Commercial | Asset Based | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	2,573,413	2,606,927
Commercial | Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	22,686	11,687
Loans held for investment	1,959,435	1,983,156
Commercial | Venture Capital Loans | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	1,936,749	1,971,469
Commercial | Equipment Finance Commercial Financing Receivable | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	30,942	32,848
Loans held for investment	594,472	691,967
Commercial | Equipment Finance Commercial Financing Receivable | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	563,530	659,119
Consumer | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Nonaccrual	296	339
Loans held for investment	385,913	375,175	$ 256,504
Consumer | Performing | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Loans held for investment	$ 385,617	$ 374,836

Loans and Leases (Details 3)

Loans and Leases (Details 3) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	$ 15,690,517	$ 15,455,954
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	15,628,023	15,347,530	$ 14,622,647
Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	344,777	409,645
Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	15,283,246	14,937,885
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	6,131,196	5,617,956	5,464,941
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	102,924	117,181
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	6,028,272	5,500,775
Real Estate Mortgage | Commercial real estate | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	4,312,248	4,353,633
Real Estate Mortgage | Commercial real estate | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	95,272	99,641
Real Estate Mortgage | Commercial real estate | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	4,216,976	4,253,992
Real Estate Mortgage | Residential Real Estate | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,818,948	1,264,323
Real Estate Mortgage | Residential Real Estate | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	7,652	17,540
Real Estate Mortgage | Residential Real Estate | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,811,296	1,246,783
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,249,222	962,839	831,515
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	0	773
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,249,222	962,066
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	680,949	578,838
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	0	409
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	680,949	578,429
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	568,273	384,001
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	0	364
Real Estate Construction and Land | Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	568,273	383,637
Commercial | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	7,861,692	8,391,560	8,069,687
Commercial | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	241,396	291,267
Commercial | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	7,620,296	8,100,293
Commercial | Cash Flow | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	2,730,395	3,107,392
Commercial | Cash Flow | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	128,207	177,661
Commercial | Cash Flow | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	2,602,188	2,929,731
Commercial | Asset Based | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	2,577,390	2,609,045
Commercial | Asset Based | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	19,645	28,112
Commercial | Asset Based | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	2,557,745	2,580,933
Commercial | Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,959,435	1,983,156
Commercial | Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	62,602	52,646
Commercial | Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	1,896,833	1,930,510
Commercial | Equipment Finance Commercial Financing Receivable | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	594,472	691,967
Commercial | Equipment Finance Commercial Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	30,942	32,848
Commercial | Equipment Finance Commercial Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	563,530	659,119
Consumer | Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	385,913	375,175	$ 256,504
Consumer | Non Purchased Credit Impaired Loans and Leases | Classified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	457	424
Consumer | Non Purchased Credit Impaired Loans and Leases | Nonclassified
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans held for investment	$ 385,456	$ 374,751

Loans and Leases (Details 4)

Loans and Leases (Details 4) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	$ 157,697	$ 170,599
Performing Restructured Loans	56,552	64,952
Total Impaired Loans and Leases	214,249	235,551
Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	157,697	170,599
Total Impaired Loans and Leases	214,249	235,551
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	66,282	69,335
Performing Restructured Loans	47,473	54,750
Total Impaired Loans and Leases	113,755	124,085
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	0	364
Performing Restructured Loans	5,764	6,893
Total Impaired Loans and Leases	5,764	7,257
Commercial | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	91,119	100,561
Performing Restructured Loans	3,209	3,157
Total Impaired Loans and Leases	94,328	103,718
Consumer | Non Purchased Credit Impaired Loans and Leases
Schedule Of Non Accrual and Performing Restructured Impaired Financing Receivables [Line Items]
Nonaccrual loans and leases	296	339
Performing Restructured Loans	106	152
Total Impaired Loans and Leases	$ 402	$ 491

Loans and Leases (Details 5)

Loans and Leases (Details 5) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Financing Receivable, Impaired [Line Items]
Total Impaired Loans and Leases	$ 214,249				$ 214,249				$ 235,551
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	16,182				16,182				24,933
Total Impaired Loans and Leases	214,249				214,249				235,551
Impaired Financing Receivable, Unpaid Principal Balance	264,863				264,863				279,952
Impaired Financing Receivable, Average Recorded Investment	209,021	[1]	$ 182,095	[1]	196,699	[2]	$ 161,412	[2]
Impaired Financing Receivable, Interest Income, Accrual Method	1,025		981		3,025		2,469
Non Purchased Credit Impaired Loans and Leases | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	1,153				1,153				6,851
Total Impaired Loans and Leases	113,755				113,755				124,085
Impaired Financing Receivable, Unpaid Principal Balance	126,017				126,017				133,985
Impaired Financing Receivable, Average Recorded Investment	113,643	[1]	89,748	[1]	112,071	[2]	82,282	[2]
Impaired Financing Receivable, Interest Income, Accrual Method	878		865		2,643		2,162
Non Purchased Credit Impaired Loans and Leases | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	0				0				0
Total Impaired Loans and Leases	5,764				5,764				7,257
Impaired Financing Receivable, Unpaid Principal Balance	5,762				5,762				7,259
Impaired Financing Receivable, Average Recorded Investment	5,764	[1]	8,606	[1]	5,764	[2]	7,842	[2]
Impaired Financing Receivable, Interest Income, Accrual Method	74		61		220		180
Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Related Allowance	15,012				15,012				17,912
Total Impaired Loans and Leases	94,328				94,328				103,718
Impaired Financing Receivable, Unpaid Principal Balance	132,611				132,611				138,136
Impaired Financing Receivable, Average Recorded Investment	89,212	[1]	83,319	[1]	78,462	[2]	70,884	[2]
Impaired Financing Receivable, Interest Income, Accrual Method	71		52		156		118
Non Purchased Credit Impaired Loans and Leases | Consumer
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	106				106				270
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	105				105				280
Impaired Financing Receivable, with Related Allowance, Related Allowance	17				17				170
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	296				296				221
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	368				368				292
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	106	[1]	346	[1]	106	[2]	330	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2		3		6		8
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	296	[1]	76	[1]	296	[2]	74	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0		1
Total Impaired Loans and Leases	402				402				491
Impaired Financing Receivable, Unpaid Principal Balance	473				473				572
Impaired Financing Receivable, Average Recorded Investment	402	[1]	422	[1]	402	[2]	404	[2]
Impaired Financing Receivable, Interest Income, Accrual Method	2		3		6		9
Cash Flow | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	31,114				31,114				51,272
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	40,068				40,068				52,910
Impaired Financing Receivable, with Related Allowance, Related Allowance	8,720				8,720				12,474
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,559				2,559				2,852
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	4,690				4,690				5,939
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	31,114	[1]	25,933	[1]	31,114	[2]	20,417	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	2		9		5		26
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,338	[1]	2,330	[1]	1,995	[2]	2,232	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	11		1		14		1
Asset Based | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	2,499				2,499				4,395
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	2,514				2,514				4,861
Impaired Financing Receivable, with Related Allowance, Related Allowance	422				422				2,144
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	4,528				4,528				664
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,479				6,479				1,652
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2,372	[1]	2,730	[1]	2,079	[2]	2,278	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	29		5		83		14
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,501	[1]	2,535	[1]	1,171	[2]	1,828	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	29		37		54		77
Venture Capital Loans | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	20,039				20,039				5,821
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	22,377				22,377				5,880
Impaired Financing Receivable, with Related Allowance, Related Allowance	5,870				5,870				3,294
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	2,647				2,647				5,866
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	6,741				6,741				8,939
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	18,298	[1]	6,878	[1]	9,621	[2]	2,542	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	2,647	[1]	0	[1]	1,922	[2]	0	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0		0
Equipment Finance Commercial Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Commercial
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0				0				1,524
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0				4,636
Impaired Financing Receivable, with Related Allowance, Related Allowance	0				0				0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	30,942				30,942				31,324
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	49,742				49,742				53,319
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	42,913	[1]	0	[2]	41,587	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		0		0		0
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	30,942	[1]	0	[1]	30,560	[2]	0	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0		0		0		0
Commercial Real Estate Construction Loan Receivable | Non Purchased Credit Impaired Loans and Leases | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	5,764				5,764				6,680
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	5,762				5,762				6,680
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	5,764	[1]	7,870	[1]	5,764	[2]	7,106	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	74		57		220		169
Residential Real Estate Construction Financing Receivable | Non Purchased Credit Impaired Loans and Leases | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	0				0				213
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	0				0				213
Impaired Financing Receivable, with Related Allowance, Related Allowance	0				0				0
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	0				0				364
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	0				0				366
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0	[1]	736	[1]	0	[2]	736	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0		4		0		11
Commercial real estate | Non Purchased Credit Impaired Loans and Leases | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	14,716				14,716				63,325
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	15,536				15,536				65,031
Impaired Financing Receivable, with Related Allowance, Related Allowance	682				682				6,266
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	92,295				92,295				44,557
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	103,306				103,306				51,402
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14,716	[1]	18,580	[1]	14,716	[2]	18,220	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	214		262		634		781
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	92,183	[1]	59,090	[1]	90,631	[2]	54,747	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	635		518		1,924		1,209
Residential Real Estate | Non Purchased Credit Impaired Loans and Leases | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	3,074				3,074				8,424
Impaired Financing Receivable, with Related Allowance, Unpaid Principal Balance	3,269				3,269				8,612
Impaired Financing Receivable, with Related Allowance, Related Allowance	471				471				585
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	3,670				3,670				7,779
Impaired Financing Receivable, with No Related Allowance, Unpaid Principal Balance	3,906				3,906				$ 8,940
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	3,074	[1]	2,505	[1]	3,074	[2]	2,325	[2]
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	14		15		41		42
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	3,670	[1]	9,573	[1]	3,650	[2]	6,990	[2]
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	$ 15		$ 70		$ 44		$ 130
[1]	For Non-PCI loans and leases reported as impaired at September 30, 2017 and 2016, amounts were calculated based on the period of time such loans and leases were impaired during the reported period.
[2]	For Non-PCI loans and leases reported as impaired at September 30, 2017 and 2016, amounts were calculated based on the period of time such loans and leases were impaired during the reported period.

Loans and Leases (Details 6)

Loans and Leases (Details 6)	3 Months Ended			9 Months Ended				12 Months Ended
	Sep. 30, 2017USD ($)contractContract		Sep. 30, 2016USD ($)contractContract	Sep. 30, 2017USD ($)contractContract		Sep. 30, 2016USD ($)contractContract		Dec. 31, 2015USD ($)
Financing Receivable, Modifications [Line Items]
Number of loans | contract	13		9	43		43
Pre-Modification Outstanding Recorded Investment	$ 29,018,000		$ 42,468,000	$ 63,597,000		$ 89,423,000
Post-Modification Outstanding Recorded Investment	$ 19,226,000		$ 42,468,000	$ 53,097,000		$ 87,091,000
Number of Loans | contract	2			0		3
Recorded Investment	$ 1,247,000	[1],[2]		$ 0	[3]	$ 41,159,000	[4]
Charge-offs	$ 0					$ 0
Real Estate Mortgage | Commercial real estate
Financing Receivable, Modifications [Line Items]
Number of loans | contract	1		2	5		7
Pre-Modification Outstanding Recorded Investment	$ 998,000		$ 1,147,000	$ 2,527,000		$ 5,287,000
Post-Modification Outstanding Recorded Investment	$ 998,000		$ 1,147,000	$ 2,463,000		$ 5,287,000
Real Estate Mortgage | Residential Real Estate
Financing Receivable, Modifications [Line Items]
Number of loans | contract	3		1	8		7
Pre-Modification Outstanding Recorded Investment	$ 566,000		$ 93,000	$ 1,328,000		$ 5,136,000
Post-Modification Outstanding Recorded Investment	$ 10,000		$ 93,000	$ 489,000		$ 5,136,000
Real Estate Construction and Land | Commercial Real Estate Construction Loan Receivable
Financing Receivable, Modifications [Line Items]
Number of loans	0		1			0		1
Pre-Modification Outstanding Recorded Investment	$ 0		$ 1,245,000			$ 0		$ 1,245,000
Post-Modification Outstanding Recorded Investment	$ 0		$ 1,245,000			$ 0		$ 1,245,000
Commercial | Cash Flow
Financing Receivable, Modifications [Line Items]
Number of loans | contract	3		2	12		12
Pre-Modification Outstanding Recorded Investment	$ 9,491,000		$ 25,000	$ 26,385,000		$ 30,582,000
Post-Modification Outstanding Recorded Investment	$ 255,000		$ 25,000	$ 17,150,000		$ 30,582,000
Commercial | Asset Based
Financing Receivable, Modifications [Line Items]
Number of loans | contract	2		1	7		5
Pre-Modification Outstanding Recorded Investment	$ 2,655,000		$ 25,000	$ 4,433,000		$ 2,158,000
Post-Modification Outstanding Recorded Investment	$ 2,655,000		$ 25,000	$ 4,433,000		$ 2,158,000
Number of Loans			1	0		1
Recorded Investment			$ 2,000	$ 0		$ 2,000
Commercial | Venture Capital Loans
Financing Receivable, Modifications [Line Items]
Number of loans | contract	4		0	9		0
Pre-Modification Outstanding Recorded Investment	$ 15,308,000		$ 0	$ 28,465,000		$ 0
Post-Modification Outstanding Recorded Investment	$ 15,308,000		$ 0	$ 28,465,000		$ 0
Commercial | Equipment Finance Commercial Financing Receivable
Financing Receivable, Modifications [Line Items]
Number of loans | contract	0		1	0		7
Pre-Modification Outstanding Recorded Investment	$ 0		$ 39,912,000	$ 0		$ 44,196,000
Post-Modification Outstanding Recorded Investment	$ 0		$ 39,912,000	$ 0		$ 42,572,000
Number of Loans | contract				0		1
Recorded Investment				$ 0		$ 39,912,000	[5]
Consumer
Financing Receivable, Modifications [Line Items]
Number of loans | contract	0		1	1		4
Pre-Modification Outstanding Recorded Investment	$ 0		$ 21,000	$ 97,000		$ 819,000
Post-Modification Outstanding Recorded Investment	$ 0		$ 21,000	$ 97,000		$ 111,000
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Modifications [Line Items]
Number of loans				0
Pre-Modification Outstanding Recorded Investment				$ 0
Post-Modification Outstanding Recorded Investment				$ 0
Number of Loans				0
Recorded Investment				$ 0
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Modifications [Line Items]
Number of loans | contract				1
Pre-Modification Outstanding Recorded Investment				$ 362,000
Post-Modification Outstanding Recorded Investment				$ 0
Number of Loans			1			1
Recorded Investment			$ 1,245,000			$ 1,245,000
[1]	Represents the balance at September 30, 2016, and there were no charge-offs.
[2]	The population of defaulted restructured loans for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the 12-month period ended September 30, 2017, the population of defaulted restructured loans includes only those loans restructured after September 30, 2016. The table excludes defaulted troubled restructurings in those classes for which the recorded investment was zero at the end of the period.
[3]	The population of defaulted restructured loans for the period indicated includes only those loans restructured during the preceding 12-month period. For example, for the 12-month period ended September 30, 2017, the population of defaulted restructured loans includes only those loans restructured after September 30, 2016. The table excludes defaulted troubled restructurings in those classes for which the recorded investment was zero at the end of the period.
[4]	Represents the balance at September 30, 2016, and there were no charge-offs.
[5]	The term of the modification for this loan expired in the second quarter of 2016 and was not renewed until the third quarter of 2016. Thus, the loan was in payment default under the loan's original terms at June 30, 2016. The modified terms were extended an additional six months in April 2017.

Loans and Leases (Details 7)

Loans and Leases (Details 7) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			$ 157,238
Balance, end of period	$ 159,606		159,606
The ending balance of the loan and lease portfolio is composed of loans and leases:
Ending balance of loans and leases	15,690,517		15,690,517		$ 15,455,954
Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	138,879	$ 132,000	143,755	$ 105,534
Charge-offs	(5,928)	(9,924)	(49,807)	(17,009)
Recoveries	4,865	6,050	9,608	8,811
Provision	14,954	8,621	49,214	39,411
Balance, end of period	152,770	136,747	152,770	136,747
Amount of the allowance applicable to loans and leases:
impairment	16,182	31,120	16,182	31,120
impairment	136,588	105,627	136,588	105,627
The ending balance of the loan and lease portfolio is composed of loans and leases:
impairment	213,252	240,772	213,252	240,772
impairment	15,414,771	14,381,875	15,414,771	14,381,875
Ending balance of loans and leases	15,628,023	14,622,647	15,628,023	14,622,647	15,347,530
Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period			13,483
Balance, beginning of period	7,079	11,289	13,483	9,577
Charge-offs	(79)	(531)	(5,768)	(862)
Recoveries	217	0	275	0
Provision	(381)	471	(1,154)	2,514
Balance, end of period	6,836		6,836
Balance, end of period	6,836	11,229	6,836	11,229
Amount of the allowance applicable to loans and leases:
deteriorated credit quality	6,836	11,229	6,836	11,229
The ending balance of the loan and lease portfolio is composed of loans and leases:
deteriorated credit quality	62,494	120,199	62,494	120,199
Ending balance of loans and leases	62,494	120,199	62,494	120,199	108,424
NonPCI and PCI Loans
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	145,958	143,289	157,238	115,111
Charge-offs	(6,007)	(10,455)	(55,575)	(17,871)
Recoveries	5,082	6,050	9,883	8,811
Provision	14,573	9,092	48,060	41,925
Balance, end of period	159,606	147,976	159,606	147,976
The ending balance of the loan and lease portfolio is composed of loans and leases:
Total loans and leases	15,690,517	14,742,846	15,690,517	14,742,846
Real Estate Mortgage | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	37,122	29,331	37,765	36,654
Charge-offs	(531)	(302)	(2,217)	(1,905)
Recoveries	36	2,414	286	4,352
Provision	(186)	5,498	607	(2,160)
Balance, end of period	36,441	36,941	36,441	36,941
Amount of the allowance applicable to loans and leases:
impairment	1,153	7,299	1,153	7,299
impairment	35,288	29,642	35,288	29,642
The ending balance of the loan and lease portfolio is composed of loans and leases:
impairment	113,304	139,059	113,304	139,059
impairment	6,017,892	5,325,882	6,017,892	5,325,882
Ending balance of loans and leases	6,131,196	5,464,941	6,131,196	5,464,941	5,617,956
Real Estate Construction and Land | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	11,318	7,853	10,045	7,137
Charge-offs	0	0	0	0
Recoveries	353	27	370	185
Provision	22	803	1,278	1,361
Balance, end of period	11,693	8,683	11,693	8,683
Amount of the allowance applicable to loans and leases:
impairment	0	11	0	11
impairment	11,693	8,672	11,693	8,672
The ending balance of the loan and lease portfolio is composed of loans and leases:
impairment	5,764	8,700	5,764	8,700
impairment	1,243,458	822,815	1,243,458	822,815
Ending balance of loans and leases	1,249,222	831,515	1,249,222	831,515	962,839
Commercial | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	88,364	93,404	93,853	61,082
Charge-offs	(4,984)	(9,606)	(46,965)	(14,306)
Recoveries	4,447	3,553	8,848	4,179
Provision	14,366	2,240	46,457	38,636
Balance, end of period	102,193	89,591	102,193	89,591
Amount of the allowance applicable to loans and leases:
impairment	15,012	23,631	15,012	23,631
impairment	87,181	65,960	87,181	65,960
The ending balance of the loan and lease portfolio is composed of loans and leases:
impairment	94,078	92,637	94,078	92,637
impairment	7,767,614	7,977,050	7,767,614	7,977,050
Ending balance of loans and leases	7,861,692	8,069,687	7,861,692	8,069,687	8,391,560
Consumer | Non Purchased Credit Impaired Loans and Leases
Allowance for Loan and Lease Losses [Roll Forward]
Balance, beginning of period	2,075	1,412	2,092	661
Charge-offs	(413)	(16)	(625)	(798)
Recoveries	29	56	104	95
Provision	752	80	872	1,574
Balance, end of period	2,443	1,532	2,443	1,532
Amount of the allowance applicable to loans and leases:
impairment	17	179	17	179
impairment	2,426	1,353	2,426	1,353
The ending balance of the loan and lease portfolio is composed of loans and leases:
impairment	106	376	106	376
impairment	385,807	256,128	385,807	256,128
Ending balance of loans and leases	$ 385,913	$ 256,504	$ 385,913	$ 256,504	$ 375,175

Loans and Leases (Details 8)

Loans and Leases (Details 8) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period				$ 157,238
Reserve for Unfunded Loan Commitments, Balance, beginning of period	$ 20,263		$ 17,944	17,523	$ 16,734
Allowance for Credit Losses, Balance, beginning of period	166,221		161,233	174,761	131,845
Reserve for Unfunded Loan Commitments, Charge-offs	0		0	0	0
Allowance for Credit Losses, Charge-offs	(6,007)		(10,455)	(55,575)	(17,871)
Reserve for Unfunded Loan Commitments, Recoveries	0		0	0	0
Allowance for Credit Losses, Recoveries	5,082		6,050	9,883	8,811
Reserve for Unfunded Loan Commitments, Net charge-offs	0		0	0	0
Allowance For Credit Losses, Net charge-offs	(925)		(4,405)	(45,692)	(9,060)
Reserve for Unfunded Commitments, Provision (negative provision)	(546)		(621)	(3,286)	(589)
Allowance for Credit Losses, Provision (negative provision)	15,119	$ 11,499	8,471	51,346	42,514
Balance, end of period	159,606			159,606
Reserve for Unfunded Loan Commitments, Balance, end of period	20,809	20,263	17,323	20,809	17,323
Allowance for Credit Losses, Balance, end of period	180,415	166,221	165,299	180,415	165,299
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period	138,879		132,000	143,755	105,534
Allowance for Credit Losses, Balance, beginning of period	159,142		149,944	161,278	122,268
Allowance for Loan and Lease Losses, Charge-offs	5,928		9,924	49,807	17,009
Allowance for Credit Losses, Charge-offs	(5,928)		(9,924)	(49,807)	(17,009)
Allowance for Loan and Lease Loss, Recoveries	4,865		6,050	9,608	8,811
Allowance for Credit Losses, Recoveries	4,865		6,050	9,608	8,811
Allowance for Loan and Lease Losses, Net charge-offs	(1,063)		(3,874)	(40,199)	(8,198)
Allowance For Credit Losses, Net charge-offs	(1,063)		(3,874)	(40,199)	(8,198)
Allowance for Loan and Lease Losses, Provision (negative provision)	14,954		8,621	49,214	39,411
Allowance for Credit Losses, Provision (negative provision)	15,500		8,000	52,500	40,000
Balance, end of period	152,770	138,879	136,747	152,770	136,747
Allowance for Credit Losses, Balance, end of period	173,579	159,142	154,070	173,579	154,070
Purchased Credit Impaired Loans and Leases
Financing Receivable, Allowance for Credit Losses [Line Items]
Balance, beginning of period				13,483
Balance, beginning of period	7,079		11,289	13,483	9,577
Allowance for Loan and Lease Losses, Charge-offs	79		531	5,768	862
Allowance for Loan and Lease Loss, Recoveries	217		0	275	0
Allowance for Loan and Lease Losses, Net charge-offs	138		(531)	(5,493)	(862)
Allowance for Loan and Lease Losses, Provision (negative provision)	(381)		471	(1,154)	2,514
Balance, end of period	6,836			6,836
Balance, end of period	$ 6,836	$ 7,079	$ 11,229	$ 6,836	$ 11,229

Loans and Leases (Details Textu

Loans and Leases (Details Textual)	3 Months Ended	9 Months Ended
	Sep. 30, 2017USD ($)agreement	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of agreements to sell loans | agreement	2
Loans held for sale, at lower of cost or fair value	$ 175,158,000	$ 175,158,000
Loan receivable held-for-sale, charge-offs		7,200,000
Unfunded commitments, loans held-for-sale	19,300,000	19,300,000
Nonaccrual loans and leases	157,697,000	157,697,000		$ 170,599,000
Receivable, 90 or more days past due	8,800,000	8,800,000		15,900,000
Receivable, 30-89 days past due	700,000	700,000		3,000,000
Financing receivable, nonaccrual status, current	148,200,000	148,200,000		151,700,000
Charge-offs	0		$ 0
Non Purchased Credit Impaired Loans and Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	157,697,000	157,697,000		170,599,000
Receivable, 90 or more days past due	8,798,000	8,798,000		15,945,000
Receivable, 30-89 days past due	5,535,000	5,535,000		$ 31,569,000
Non Purchased Credit Impaired Loans and Leases | Non Purchased Credit Impaired Loans and Leases | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	129,100,000	$ 129,100,000
Percentage of nonaccrual loans and leases		81.90%
Healthcare Real Estate Loan | Non Purchased Credit Impaired Loans and Leases | Non Purchased Credit Impaired Loans and Leases | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual loans and leases	$ 45,500,000	$ 45,500,000

Foreclosed Assets (Details)

Foreclosed Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Total other real estate owned, net	$ 11,052	$ 11,876
Other foreclosed assets	578	1,100
Foreclosed assets, net	11,630	12,976
Construction and land development
Total other real estate owned, net	9,319	11,224
Multi‑family
Total other real estate owned, net	0	652
Commercial real estate
Total other real estate owned, net	65	0
Single family residence
Total other real estate owned, net	$ 1,668	$ 0

Foreclosed Assets (Details 1)

Foreclosed Assets (Details 1) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Other Real Estate Owned Net Covered and NonCovered Including Foreclosed Assets [Abstract]
Balance, beginning of period	$ 12,976
Loans transferred to foreclosed assets	580	$ 129
Other additions	1,385
Provision for losses	(2,138)
Reductions related to sales	(1,173)
Balance, end of period	$ 11,630

Borrowings and Subordinated D49

Borrowings and Subordinated Debentures (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Borrowings	$ 250,399	$ 905,812
Non‑recourse debt
Debt Instrument [Line Items]
Amount	$ 399	$ 812
Rate	6.82%	6.41%
AFX borrowings
Debt Instrument [Line Items]
Amount	$ 0	$ 40,000
Rate	0.00%	0.81%
Federal Home Loan Bank of San Francisco | FHLB secured advances
Debt Instrument [Line Items]
Amount	$ 115,000	$ 735,000
Rate	1.14%	0.59%
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance
Debt Instrument [Line Items]
Amount	$ 135,000	$ 130,000
Rate	1.15%	0.55%

Borrowings and Subordinated D50

Borrowings and Subordinated Debentures (Details 1) $ in Thousands, € in Millions		9 Months Ended
		Sep. 30, 2017USD ($)	Sep. 30, 2017EUR (€)	Dec. 31, 2016USD ($)
Subordinated Borrowing [Line Items]
Amount		$ 542,210		$ 538,973
Unamortized discount		(94,084)		(98,229)
Net subordinated debentures		448,126		440,744
Subordinated Debt Trust V Due September 2033
Subordinated Borrowing [Line Items]
Amount		$ 10,310		$ 10,310
Rate		4.42%	4.42%	4.09%
Date Issued		Aug. 15, 2003
Maturity Date		Sep. 17, 2033
Description of variable rate basis		3 month LIBOR + 3.10
Subordinated Debt Trust VI Due September 2033
Subordinated Borrowing [Line Items]
Amount		$ 10,310		$ 10,310
Rate		4.37%	4.37%	4.01%
Date Issued		Sep. 3, 2003
Maturity Date		Sep. 15, 2033
Description of variable rate basis		3 month LIBOR + 3.05
Subordinated Debt Trust CII Due September 2033
Subordinated Borrowing [Line Items]
Amount		$ 5,155		$ 5,155
Rate		4.27%	4.27%	3.95%
Date Issued		Sep. 17, 2003
Maturity Date		Sep. 17, 2033
Description of variable rate basis		3 month LIBOR + 2.95
Subordinated Debt Trust VII Due April 2034
Subordinated Borrowing [Line Items]
Amount		$ 61,856		$ 61,856
Rate		4.06%	4.06%	3.64%
Date Issued		Feb. 5, 2004
Maturity Date		Apr. 23, 2034
Description of variable rate basis		3 month LIBOR + 2.75
Subordinated Debt Trust CIII Due September 2035
Subordinated Borrowing [Line Items]
Amount		$ 20,619		$ 20,619
Rate		3.01%	3.01%	2.65%
Date Issued		Aug. 15, 2005
Maturity Date		Sep. 15, 2035
Description of variable rate basis		3 month LIBOR + 1.69
Subordinated Debt Trust FCCI Due March 2037
Subordinated Borrowing [Line Items]
Amount		$ 16,495		$ 16,495
Rate		2.92%	2.92%	2.56%
Date Issued		Jan. 25, 2007
Maturity Date		Mar. 15, 2037
Description of variable rate basis		3 month LIBOR + 1.60
Subordinated Debt Trust FCBI Due December 2035
Subordinated Borrowing [Line Items]
Amount		$ 10,310		$ 10,310
Rate		2.87%	2.87%	2.51%
Date Issued		Sep. 30, 2005
Maturity Date		Dec. 15, 2035
Description of variable rate basis		3 month LIBOR + 1.55
Trust Preferred Securities Two Thousand Five Series One
Subordinated Borrowing [Line Items]
Amount		$ 82,475		$ 82,475
Rate		3.27%	3.27%	2.91%
Date Issued		Nov. 21, 2005
Maturity Date		Dec. 15, 2035
Description of variable rate basis		3 month LIBOR + 1.95
Trust Preferred Securities Two Thousand Five Series Two
Subordinated Borrowing [Line Items]
Amount		$ 128,866		$ 128,866
Rate		3.26%	3.26%	2.84%
Date Issued		Dec. 14, 2005
Maturity Date		Jan. 30, 2036
Description of variable rate basis		3 month LIBOR + 1.95
Two Thousand Six One Term Debt Securitization
Subordinated Borrowing [Line Items]
Amount		$ 51,545		$ 51,545
Rate		3.26%	3.26%	2.84%
Date Issued		Feb. 22, 2006
Maturity Date		Apr. 30, 2036
Description of variable rate basis		3 month LIBOR + 1.95
Two Thousand Six Two Term Debt Securitization
Subordinated Borrowing [Line Items]
Amount		$ 51,550		$ 51,550
Rate		3.26%	3.26%	2.84%
Date Issued		Sep. 27, 2006
Maturity Date		Oct. 30, 2036
Description of variable rate basis		3 month LIBOR + 1.95
Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Amount	[1]	$ 30,422		$ 27,185
Rate		1.72%	1.72%	1.74%
Date Issued		Sep. 29, 2006
Maturity Date		Oct. 30, 2036
Denomination value | €			€ 25.8
Description of variable rate basis		3 month EURIBOR + 2.05
Trust Preferred Securities Two Thousand Six Series Four
Subordinated Borrowing [Line Items]
Amount		$ 16,470		$ 16,470
Rate		3.26%	3.26%	2.84%
Date Issued		Dec. 5, 2006
Maturity Date		Jan. 30, 2037
Description of variable rate basis		3 month LIBOR + 1.95
Trust Preferred Securities Two Thousand Six Series Five
Subordinated Borrowing [Line Items]
Amount		$ 6,650		$ 6,650
Rate		3.26%	3.26%	2.84%
Date Issued		Dec. 19, 2006
Maturity Date		Jan. 30, 2037
Description of variable rate basis		3 month LIBOR + 1.95
Two Thousand Seven One Term Debt Securitization
Subordinated Borrowing [Line Items]
Amount		$ 39,177		$ 39,177
Rate		3.26%	3.26%	2.84%
Date Issued		Jun. 13, 2007
Maturity Date		Jul. 30, 2037
Description of variable rate basis		3 month LIBOR + 1.95
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust V Due September 2033
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		3.10%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust VI Due September 2033
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		3.05%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust CII Due September 2033
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.95%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust VII Due April 2034
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.75%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust CIII Due September 2035
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.69%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust FCCI Due March 2037
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.60%
London Interbank Offered Rate (LIBOR) | Subordinated Debt Trust FCBI Due December 2035
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.55%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Five Series One
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Five Series Two
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
London Interbank Offered Rate (LIBOR) | Two Thousand Six One Term Debt Securitization
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
London Interbank Offered Rate (LIBOR) | Two Thousand Six Two Term Debt Securitization
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Six Series Four
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
London Interbank Offered Rate (LIBOR) | Trust Preferred Securities Two Thousand Six Series Five
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
London Interbank Offered Rate (LIBOR) | Two Thousand Seven One Term Debt Securitization
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		1.95%
Euribor Rate | Trust Preferred Securities Two Thousand Six Series Three
Subordinated Borrowing [Line Items]
Rate Index (Quarterly Reset)		2.05%
[1]	Denomination is in Euros with a value of €25.8 million.

Borrowings and Subordinated D51

Borrowings and Subordinated Debentures (Details Textual) - USD ($)	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Non‑recourse debt
Debt Instrument [Line Items]
Weighted average remaining maturity period	1 year 11 months
Unused Lines of Credit
Debt Instrument [Line Items]
Amount outstanding	$ 0	$ 0
Current borrowing capacity	75,000,000
Unused commitment fees	0
AFX borrowings
Debt Instrument [Line Items]
Amount outstanding	0	40,000,000
Maturity Overnight | AFX borrowings
Debt Instrument [Line Items]
Amount outstanding		26,000,000
Maturity Less than 30 Days | AFX borrowings
Debt Instrument [Line Items]
Amount outstanding		14,000,000
Federal Reserve Bank Advances
Debt Instrument [Line Items]
Loans pledged as collateral	2,900,000,000
Amount outstanding	0	0
Federal Reserve Bank Advances | FHLB secured advances
Debt Instrument [Line Items]
Borrowing capacity description	2,170,255,000
Federal Home Loan Bank of San Francisco
Debt Instrument [Line Items]
Loans pledged as collateral	4,400,000,000
Federal Home Loan Bank of San Francisco | FHLB secured advances
Debt Instrument [Line Items]
Borrowing capacity description	3,033,258,000
Current outstanding	115,000,000	735,000,000
Federal Home Loan Bank of San Francisco | FHLB unsecured overnight advance
Debt Instrument [Line Items]
Current outstanding	135,000,000	130,000,000
Federal Home Loan Bank of San Francisco | Unused Lines of Credit
Debt Instrument [Line Items]
Borrowing capacity description	$ 135,000,000
Amount outstanding		130,000,000
Federal Home Loan Bank of San Francisco | Maturity Overnight
Debt Instrument [Line Items]
Current outstanding		435,000,000
Federal Home Loan Bank of San Francisco | Maturity Less than 30 Days
Debt Instrument [Line Items]
Current outstanding		$ 300,000,000

Commitments and Contingencies52

Commitments and Contingencies (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Loan commitments to extend credit	$ 5,037,084	$ 4,166,703
Standby letters of credit	237,052	211,398
Total	$ 5,274,136	$ 4,378,101

Commitments and Contingencies53

Commitments and Contingencies (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Long-term Purchase Commitment [Line Items]
Commitment to contribute capital	$ 43,100	$ 26,600
Private Equity Funds
Long-term Purchase Commitment [Line Items]
Remaining minimum amount committed	2,500	$ 2,800
Student Loan
Long-term Purchase Commitment [Line Items]
Remaining minimum amount committed	7,800
First California Financial Group Inc. [Member]
Long-term Purchase Commitment [Line Items]
Payments for Legal Settlements	$ 1,750

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	$ 3,532,230	$ 3,223,830
Equity warrants		5,497
Derivative Liability	564	3,285
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale		2,080
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale		3,156,475
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale		65,275
Government agency and government-sponsored enterprise pass through securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	377,541	502,443
Government agency and government-sponsored enterprise collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	175,950	146,289
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	1,549,150	1,456,459
Government agency and government-sponsored enterprise commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	995,914	547,692
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	19,125	47,509
Collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	19,176	156,887
SBA asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	168,028	178,845
Asset-backed and other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	92,796	62,237
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	3,532,230	3,223,830
Equity warrants	5,158	5,497
Other derivative assets	1,221	694
Total recurring assets	3,538,609	3,230,021
Derivative liabilities	564	3,285
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	4,808	2,080
Equity warrants	0	0
Other derivative assets	0	0
Total recurring assets	4,808	2,080
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	3,447,101	3,156,475
Equity warrants	0	0
Other derivative assets	1,221	694
Total recurring assets	3,448,322	3,157,169
Derivative liabilities	564	3,285
Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	80,321	65,275
Equity warrants	5,158	5,497
Other derivative assets	0	0
Total recurring assets	85,479	70,772
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise pass through securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	377,541	502,443
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise pass through securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise pass through securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	377,541	502,443
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise pass through securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	175,950	146,289
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	175,950	146,289
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise collateralized mortgage obligations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Private Label Collateralized Mortgage Obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	134,550	125,469
Fair Value, Measurements, Recurring | Private Label Collateralized Mortgage Obligations | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Private Label Collateralized Mortgage Obligations | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	96,614	68,567
Fair Value, Measurements, Recurring | Private Label Collateralized Mortgage Obligations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	37,936	56,902
Fair Value, Measurements, Recurring | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	1,549,150	1,456,459
Fair Value, Measurements, Recurring | Municipal securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Municipal securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	1,549,150	1,456,459
Fair Value, Measurements, Recurring | Municipal securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise commercial mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	995,914	547,692
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise commercial mortgage-backed securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise commercial mortgage-backed securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	995,914	547,692
Fair Value, Measurements, Recurring | Government agency and government-sponsored enterprise commercial mortgage-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	19,125	47,509
Fair Value, Measurements, Recurring | Corporate debt securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Corporate debt securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	19,125	47,509
Fair Value, Measurements, Recurring | Corporate debt securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Collateralized loan obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	19,176	156,887
Fair Value, Measurements, Recurring | Collateralized loan obligations | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Collateralized loan obligations | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	19,176	156,887
Fair Value, Measurements, Recurring | Collateralized loan obligations | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | SBA asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	168,028	178,845
Fair Value, Measurements, Recurring | SBA asset-backed securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | SBA asset-backed securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	168,028	178,845
Fair Value, Measurements, Recurring | SBA asset-backed securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	0	0
Fair Value, Measurements, Recurring | Asset-backed and other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	92,796	62,237
Fair Value, Measurements, Recurring | Asset-backed and other securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	4,808	2,080
Fair Value, Measurements, Recurring | Asset-backed and other securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	45,603	51,784
Fair Value, Measurements, Recurring | Asset-backed and other securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale	$ 42,385
Square 1 Financial, Inc. | Fair Value, Measurements, Recurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity warrants		5,497
Square 1 Financial, Inc. | Fair Value, Measurements, Recurring | Asset-backed and other securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available‑for‑sale		$ 8,373

Fair Value Measurements (Deta55

Fair Value Measurements (Details 1) - Level 3 - Fair Value, Measurements, Recurring	9 Months Ended
	Sep. 30, 2017
Minimum | Private label collateralized mortgage obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Voluntary annual prepayment speeds	3.20%
Annual default rates	0.10%
Loss severity rates	4.00%
Discount rates	1.60%
Maximum | Private label collateralized mortgage obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Voluntary annual prepayment speeds	25.50%
Annual default rates	13.60%
Loss severity rates	95.90%
Discount rates	9.90%
Weighted Average | Private Label CMOs
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Voluntary annual prepayment speeds	9.60%
Annual default rates	2.20%
Loss severity rates	46.90%
Discount rates	4.60%
Weighted Average | Private label collateralized mortgage obligations
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Voluntary annual prepayment speeds	9.60%
Annual default rates	2.20%
Loss severity rates	46.90%
Discount rates	4.60%
Weighted Average | SBA securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Voluntary annual prepayment speeds	13.50%
Annual default rates	1.80%
Loss severity rates	52.40%
Discount rates	3.60%

Fair Value Measurements (Deta56

Fair Value Measurements (Details 2) - Weighted Average - Warrant - Fair Value, Measurements, Recurring - Level 3	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Volatility	17.30%
Risk-free interest rate	1.70%
Remaining life assumption (in years)	3 years 9 months

Fair Value Measurements (Deta57

Fair Value Measurements (Details 3) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Level 3 CMO [Roll Forward]
Equity warrants, Balance, beginning of period	$ 5,497
Fair value transfers of assets measured on a recurring basis	(654)
Level 3
Level 3 CMO [Roll Forward]
Total included in earnings, Equity Warrants	1,701
Total included in other comprehensive income	0
Purchases		$ 0
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	720
Sales, Equity Warrants	(2,106)
Net settlements, Equity Warrants	0
Fair Value, Measurements, Recurring
Level 3 CMO [Roll Forward]
Equity warrants, Balance, beginning of period	5,497
Fair Value, Measurements, Recurring | Level 3
Level 3 CMO [Roll Forward]
Equity warrants, Balance, beginning of period	5,497
Private Label CMOs | Fair Value, Measurements, Recurring | Level 3
Level 3 CMO [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	37,936		$ 56,902
Total included in earnings	2,114
Total included in other comprehensive income	(578)
Purchases		0
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(4,732)
Net settlements	(15,770)
Asset-backed and other securities | Fair Value, Measurements, Recurring | Level 3
Level 3 CMO [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	42,385		$ 8,373
Total included in earnings	314
Total included in other comprehensive income	(349)
Purchases		$ 37,722
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0
Net settlements	(3,675)
Private label collateralized mortgage obligations
Level 3 CMO [Roll Forward]
Fair value transfers of assets measured on a recurring basis	0
SBA securities
Level 3 CMO [Roll Forward]
Fair value transfers of assets measured on a recurring basis	0
Warrant
Level 3 CMO [Roll Forward]
Fair value transfers of assets measured on a recurring basis	$ (654)

Fair Value Measurements (Deta58

Fair Value Measurements (Details 4) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	$ 72,563	$ 161,215
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	15,879	12,885
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	56,684	148,330
Non Purchased Credit Impaired Loans and Leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	63,463	149,749
Non Purchased Credit Impaired Loans and Leases | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	0	0
Non Purchased Credit Impaired Loans and Leases | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	6,779	1,661
Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	56,684	148,088
Other real estate and foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	9,100	11,224
Other real estate and foreclosed assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	0	0
Other real estate and foreclosed assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	9,100	11,224
Cost-method Investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans		242
Cost-method Investments | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans		0
Cost-method Investments | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans		0
Cost-method Investments | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans		242
Third party appraisals | Other real estate and foreclosed assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	$ 0	$ 0

Fair Value Measurements (Deta59

Fair Value Measurements (Details 5) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total losses	$ 6,551	$ 12,935	$ 20,019	$ 27,301
Non Purchased Credit Impaired Loans and Leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total losses	4,427	12,935	17,895	27,301
Other real estate and foreclosed assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total losses	$ 2,124	$ 0	$ 2,124	$ 0

Fair Value Measurements (Deta60

Fair Value Measurements (Details 6) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	$ 72,563	$ 161,215
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	56,684	148,330
Non Purchased Credit Impaired Loans and Leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	63,463	149,749
Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	56,684	$ 148,088
Discount Rates | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	55,365
No Discounts | Third party appraisals | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired Non‑PCI loans	$ 1,319
Minimum | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates	2.00%
Maximum | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates	8.93%
Weighted Average | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates	6.84%
Weighted Average | Discount Rates | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates	6.84%

Fair Value Measurements (Deta61

Fair Value Measurements (Details 7) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 72,563	$ 161,215
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	56,684	148,330
Non Purchased Credit Impaired Loans and Leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	63,463	149,749
Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 56,684	$ 148,088
Minimum | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, Weighted Average	2.00%
Maximum | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, Weighted Average	8.93%
Weighted Average | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, Weighted Average	6.84%
Discount Rates | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 55,365
Discount Rates | Weighted Average | Discounted Cash Flow | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rates, Weighted Average	6.84%
No Discounts | Third party appraisals | Non Purchased Credit Impaired Loans and Leases | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value	$ 1,319

Fair Value Measurements (Deta62

Fair Value Measurements (Details 8) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	$ 147,579	$ 337,965
Interest-earning deposits in financial institutions	122,439	81,705
Securities available-for-sale, Carrying Amount		3,223,830
Securities available-for-sale, at fair value	3,532,230	3,223,830
Investment in FHLB stock, Carrying Amount	17,250	21,870
Investment in FHLB stock, Fair Value	17,250	21,870
Investments carried at cost, Carrying Amount	1,006	1,416
Investments carried at cost, Fair Value	10,702	3,843
Loans and leases, net	15,530,911	15,298,716
Loans and leases held for investment, net	15,700,815
Warrants and Rights Outstanding		5,497
Equity warrants		5,497
Other derivative assets, Carrying Amount	1,221	694
Demand, interest checking, money market, and savings deposits	13,531,300	12,523,834
Interest-bearing Domestic Deposit, Brokered	1,118,694	1,174,487
Time deposits	2,123,251	2,172,290
Time deposits	2,114,655	2,166,187
Borrowings	250,399	905,812
Borrowings	250,399	905,838
Subordinated debentures	448,126	440,744
Subordinated debentures	431,173	424,507
Derivative Liability	564	3,285
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	147,579	337,965
Interest-earning deposits in financial institutions	122,439	81,705
Securities available-for-sale, at fair value		2,080
Investment in FHLB stock, Fair Value	0	0
Investments carried at cost, Fair Value	0	0
Demand, interest checking, money market, and savings deposits	0	0
Interest-bearing Domestic Deposit, Brokered	0	0
Time deposits	0	0
Borrowings	250,000	591,000
Subordinated debentures	0	0
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest-earning deposits in financial institutions	0	0
Securities available-for-sale, at fair value		3,156,475
Investment in FHLB stock, Fair Value	17,250	21,870
Investments carried at cost, Fair Value	0	0
Demand, interest checking, money market, and savings deposits	13,531,300	12,523,834
Interest-bearing Domestic Deposit, Brokered	1,118,694	1,174,487
Time deposits	2,114,655	2,166,187
Borrowings	399	314,838
Subordinated debentures	431,173	424,507
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and due from banks	0	0
Interest-earning deposits in financial institutions	0	0
Securities available-for-sale, at fair value		65,275
Investment in FHLB stock, Fair Value	0	0
Investments carried at cost, Fair Value	10,702	3,843
Loans and leases held for investment, net	15,694,036
Demand, interest checking, money market, and savings deposits	0	0
Interest-bearing Domestic Deposit, Brokered	0	0
Time deposits	0	0
Borrowings	0	0
Subordinated debentures	0	0
Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	3,532,230	3,223,830
Equity warrants	5,158	5,497
Other derivative assets, Fair Value	1,221	694
Derivative liabilities	564	3,285
Fair Value, Measurements, Recurring | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	4,808	2,080
Equity warrants	0	0
Other derivative assets, Fair Value	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	3,447,101	3,156,475
Equity warrants	0	0
Other derivative assets, Fair Value	1,221	694
Derivative liabilities	564	3,285
Fair Value, Measurements, Recurring | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities available-for-sale, at fair value	80,321	65,275
Equity warrants	5,158	5,497
Other derivative assets, Fair Value	0	0
Derivative liabilities	0	0
NonPCI and PCI Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases, net		15,298,716
Loans and leases held for investment, net		15,494,808
NonPCI and PCI Loans | Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment, net	0	0
NonPCI and PCI Loans | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment, net	$ 6,779	1,661
NonPCI and PCI Loans | Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans and leases held for investment, net		$ 15,493,147

Fair Value Measurements (Deta63

Fair Value Measurements (Details Textual)	9 Months Ended
	Sep. 30, 2017USD ($)
Fair Value Disclosures [Abstract]
Fair value transfers of assets	$ 0
Fair value transfers of assets measured on a recurring basis	$ 654,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net earnings from continuing operations	$ 101,466	$ 93,647	$ 93,895	$ 273,781	$ 266,519
Less: Earnings allocated to unvested restricted stock	(1,149)	(1,080)	(1,048)	(3,239)	(2,983)
Net earnings allocated to common shares	$ 100,317	$ 92,567	$ 92,847	$ 270,542	$ 263,536
Weighted-average basic shares and unvested restricted stock outstanding (shares)	121,447	121,422	121,818	121,405	121,739
Weighted-average unvested restricted stock outstanding (shares)	(1,394)	(1,455)	(1,401)	(1,450)	(1,425)
Weighted-average basic shares outstanding (shares)	120,053	119,967	120,417	119,955	120,314
Basic net income per share (usd per share)	$ 0.84	$ 0.77	$ 0.77	$ 2.26	$ 2.19
Net earnings from continuing operations allocated to common shares	$ 100,317	$ 92,567	$ 92,847	$ 270,542	$ 263,536
Diluted net income per share (usd per share)	$ 0.84	$ 0.77	$ 0.77	$ 2.26	$ 2.19

Stock Based Compensation (Detai

Stock Based Compensation (Details Textual) - USD ($) $ in Millions	3 Months Ended			9 Months Ended	12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Dec. 31, 2015	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares (shares)	1,393,874			1,393,874		1,476,132
Vesting period of time-based restricted stock, lower limit	3 years
Vesting period of time-based restricted stock, higher limit	4 years
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance vesting percentage				0.00%
Performance Target 1 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance vesting percentage				150.00%
Performance Target 2 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance vesting percentage				200.00%
Restricted Stock | Vesting Based On Service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share-based compensation expense	$ 6.5	$ 6.6	$ 5.6	$ 19.6	$ 16.6
Restricted Stock Awards And Performance Based Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized share based compensation expense	$ 47.5			$ 47.5
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares (shares)	239,025			239,025
Performance period				3 years
PacWest 2003 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (shares)	4,000,000			4,000,000
Number of shares available for grant (shares)	3,837,850			3,837,850
PacWest 2003 Stock Incentive Plan | Time-Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested restricted shares (shares)	1,393,874			1,393,874

Subsequent Events (Details Text

Subsequent Events (Details Textuals) - $ / shares	Nov. 01, 2017	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Subsequent Event [Line Items]
Dividends declared per share (usd per share)		$ 0.50	$ 0.50	$ 0.50	$ 1.50	$ 1.5
Subsequent Event [Member] | Dividend Declared
Subsequent Event [Line Items]
Dividends declared per share (usd per share)	$ 0.50