Texas Capital Bancshares (TCBI) 10-Q 17 Oct 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Oct. 16, 2019
Entity Information [Line Items]
Entity Address, Address Line One	2000 McKinney Avenue
Entity Address, Postal Zip Code	75201
Entity Incorporation, State or Country Code	DE
Document Transition Report	false
Document Quarterly Report	true
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	0001077428
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Entity File Number	001-34657
City Area Code	214
Local Phone Number	932-6600
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q3
Amendment Flag	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		50,320,553
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Tax Identification Number	75-2679109
Entity Address, Address Line Two	Suite 700
Entity Address, City or Town	Dallas
Entity Address, State or Province	TX
Entity Address, Country	US
Common Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	TCBI
Security Exchange Name	NASDAQ
Series A Preferred Stock [Member]
Entity Information [Line Items]
Title of 12(b) Security	6.5% Non-Cumulative Perpetual Preferred Stock Series A, par value $0.01 per share
Trading Symbol	TCBIP
Security Exchange Name	NASDAQ

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets
Cash and due from banks	$ 216,085	$ 214,191
Interest-bearing deposits in other banks	4,968,185	2,815,684
Federal funds sold and securities purchased under resale agreements	25,000	50,190
Investment securities	238,022	120,216
Loans held for sale ($2,667.2 million at September 30, 2019 and $1,969.2 million at December 31, 2018, at fair value)	2,674,225	1,969,474
Loans held for investment, mortgage finance	7,951,432	5,877,524
Loans held for investment (net of unearned income)	16,772,824	16,690,550
Less: Allowance for loan losses	(190,138)	(191,522)
Loans held for investment, net	24,534,118	22,376,552
Mortgage servicing rights, net	49,125	42,474
Premises and equipment, net	32,667	23,802
Accrued interest receivable and other assets	770,793	626,614
Goodwill and intangible assets, net	18,217	18,570
Total assets	33,526,437	28,257,767
Deposits:
Non-interest-bearing	10,289,572	7,317,161
Interest-bearing	17,123,731	13,288,952
Total deposits	27,413,303	20,606,113
Accrued interest payable	34,336	20,675
Other liabilities	285,954	194,238
Federal funds purchased and repurchase agreements	139,967	641,174
Other borrowings	2,500,000	3,900,000
Subordinated notes, net	282,038	281,767
Trust preferred subordinated debentures	113,406	113,406
Total liabilities	30,769,004	25,757,373
Comprehensive income:
Preferred stock, $.01 par value, $1,000 liquidation value: Authorized shares - 10,000,000; Issued shares - 6,000,000 shares issued at December 31, 2018 and 2017	150,000	150,000
Common stock, $.01 par value: Authorized shares - 100,000,000; Issued shares - 45,735,424 and 41,036,787 at December 31, 2018 and 2017, respectively	503	502
Additional paid-in capital	974,799	967,890
Retained earnings	1,623,128	1,381,492
Treasury stock (shares at cost: 417 at September 30, 2019 and December 31, 2018)	(8)	(8)
Accumulated other comprehensive income, net of taxes	9,011	518
Total stockholders’ equity	2,757,433	2,500,394
Total liabilities and stockholders’ equity	$ 33,526,437	$ 28,257,767

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Loans held for sale ($2,667.2 million at September 30, 2019 and $1,969.2 million at December 31, 2018, at fair value)	$ 2,667,200,000	$ 1,969,200,000
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, Liquidation value	$ 1,000	$ 1,000
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	6,000,000	6,000,000
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	50,318,071	50,201,127
Treasury stock, shares	417	417

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest income
Interest and fees on loans	$ 329,344	$ 291,189	$ 971,889	$ 814,500
Investment securities	2,316	1,161	6,036	1,560
Federal funds sold and securities purchased under resale agreements	554	1,018	1,090	2,808
Interest-bearing deposits in other banks	22,887	8,386	48,540	23,607
Total interest income	355,101	301,754	1,027,555	842,475
Interest expense
Deposits	80,967	52,034	222,550	123,343
Federal funds purchased	1,835	1,800	10,553	4,434
Other borrowings	14,703	10,317	46,681	24,481
Subordinated notes	4,191	4,191	12,573	12,573
Trust preferred subordinated debentures	1,237	1,237	3,863	3,457
Total interest expense	102,933	69,579	296,220	168,288
Net interest income	252,168	232,175	731,335	674,187
Provision for credit losses	11,000	13,000	58,000	52,000
Net interest income after provision for credit losses	241,168	219,175	673,335	622,187
Non-interest income
Service charges on deposit accounts	2,707	3,477	8,535	9,619
Wealth management and trust fee income	2,330	2,065	6,468	5,996
Brokered loan fees	8,691	6,141	21,093	17,124
Servicing income	3,549	4,987	9,409	15,446
Swap fees	1,196	1,355	2,828	4,269
Net gain/(loss) on sale of loans held for sale	(6,011)	(444)	(12,502)	(7,847)
Other	7,839	7,937	38,848	18,137
Total non-interest income	20,301	25,518	74,679	62,744
Non-interest expense
Salaries and employee benefits	80,106	77,327	234,818	222,268
Net occupancy expense	8,125	8,362	23,914	22,952
Marketing	14,753	10,214	40,548	29,127
Legal and professional	11,394	10,764	31,428	29,948
Communications and technology	10,805	7,435	31,025	21,211
FDIC insurance assessment	5,220	6,524	14,480	18,884
Servicing related expenses	8,165	4,207	19,613	12,379
Allowance and other carrying costs for other real estate owned	2	(1,864)	2	467
Other	10,800	13,174	35,481	37,998
Total non-interest expense	149,370	136,143	431,309	395,234
Income before income taxes	112,099	108,550	316,705	289,697
Income tax expense	23,958	22,998	67,756	60,764
Net income	88,141	85,552	248,949	228,933
Preferred stock dividends	2,438	2,438	7,313	7,313
Net income available to common stockholders	85,703	83,114	241,636	221,620
Other comprehensive income (loss)
Change in unrealized gain (loss) on available-for-sale debt securities arising during period, before tax	884	(2,223)	10,752	(2,390)
Income tax expense (benefit) related to unrealized loss on available-for-sale debt securities	186	(467)	2,259	(502)
Other comprehensive income (loss), net of tax	698	(1,756)	8,493	(1,888)
Comprehensive income	$ 88,839	$ 83,796	$ 257,442	$ 227,045
Basic earnings per common share
Basic earnings per common share	$ 1.70	$ 1.66	$ 4.81	$ 4.45
Diluted earnings per common share
Diluted earnings per common share	$ 1.70	$ 1.65	$ 4.80	$ 4.41

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
Beginning balance - Shares at Dec. 31, 2017		6,000,000	49,643,761			417
Beginning balance - Amount at Dec. 31, 2017	$ 2,202,721	$ 150,000	$ 496	$ 961,305	$ 1,090,500	$ (8)	$ 428
Comprehensive income:
Net income	228,933				228,933
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	(1,888)						(1,888)
Comprehensive income	227,045
Stock-based compensation expense recognized in earnings	6,383			6,383
Preferred stock dividend	(7,313)				(7,313)
Issuance of stock related to stock-based awards - Shares			97,061
Issuance of stock related to stock-based awards - Amount	(2,396)		$ 1	(2,397)
Issuance of common stock related to warrants - shares			436,855
Issuance of common stock related to warrants			$ 5	(5)
Ending balance - Amount at Sep. 30, 2018	2,426,442	$ 150,000	$ 502	965,286	1,312,038	$ (8)	(1,376)
Ending balance - Shares at Sep. 30, 2018		6,000,000	50,177,677			417
Beginning balance - Shares at Jun. 30, 2018		6,000,000	50,151,481			417
Beginning balance - Amount at Jun. 30, 2018	2,343,530	$ 150,000	$ 502	963,732	1,228,924	$ (8)	380
Comprehensive income:
Net income	85,552				85,552
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	(1,756)						(1,756)
Comprehensive income	83,796
Stock-based compensation expense recognized in earnings	2,292			2,292
Preferred stock dividend	(2,438)				(2,438)
Issuance of stock related to stock-based awards - Shares			25,989
Issuance of stock related to stock-based awards - Amount	(738)			(738)
Issuance of common stock related to warrants - shares			207
Issuance of common stock related to warrants			$ 0	0
Ending balance - Amount at Sep. 30, 2018	2,426,442	$ 150,000	$ 502	965,286	1,312,038	$ (8)	(1,376)
Ending balance - Shares at Sep. 30, 2018		6,000,000	50,177,677			417
Beginning balance - Shares at Dec. 31, 2018		6,000,000	50,201,127			417
Beginning balance - Amount at Dec. 31, 2018	2,500,394	$ 150,000	$ 502	967,890	1,381,492	$ (8)	518
Comprehensive income:
Net income	248,949				248,949
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	8,493						8,493
Comprehensive income	257,442
Stock-based compensation expense recognized in earnings	8,565			8,565
Preferred stock dividend	(7,313)				(7,313)
Issuance of stock related to stock-based awards - Shares			108,176
Issuance of stock related to stock-based awards - Amount	(1,655)		$ 1	(1,656)
Issuance of common stock related to warrants - shares			8,768
Ending balance - Amount at Sep. 30, 2019	2,757,433	$ 150,000	$ 503	974,799	1,623,128	$ (8)	9,011
Ending balance - Shares at Sep. 30, 2019		6,000,000	50,318,071			417
Beginning balance - Shares at Jun. 30, 2019		6,000,000	50,297,969			417
Beginning balance - Amount at Jun. 30, 2019	2,668,452	$ 150,000	$ 503	972,219	1,537,425	$ (8)	8,313
Comprehensive income:
Net income	88,141				88,141
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	698						698
Comprehensive income	88,839
Stock-based compensation expense recognized in earnings	3,023			3,023
Preferred stock dividend	(2,438)				(2,438)
Issuance of stock related to stock-based awards - Shares			20,102
Issuance of stock related to stock-based awards - Amount	(443)			(443)
Ending balance - Amount at Sep. 30, 2019	$ 2,757,433	$ 150,000	$ 503	$ 974,799	$ 1,623,128	$ (8)	$ 9,011
Ending balance - Shares at Sep. 30, 2019		6,000,000	50,318,071			417

CONSOLIDATED STATEMENTS OF ST_2

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Stockholders' Equity [Abstract]
Income tax expense (benefit) related to unrealized loss on available-for-sale securities	$ 186	$ (467)	$ 2,259	$ (502)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating activities
Net income	$ 248,949	$ 228,933
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	58,000	52,000
Depreciation and amortization	25,754	24,776
Net (gain)/loss on sale of loans held for sale	12,502	7,847
Increase (decrease) in valuation allowance on mortgage servicing rights	8,360	(2,823)
Stock-based compensation expense	12,973	15,633
Purchases and originations of loans held for sale	(7,288,823)	(5,012,188)
Proceeds from sales and repayments of loans held for sale	6,534,879	4,321,485
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(156,472)	(80,731)
Accrued interest payable and other liabilities	114,282	33,920
Net cash used in operating activities	(429,596)	(411,148)
Investing activities
Purchases of investment securities	(111,131)	(99,295)
Principal payments received on investment securities	5,534	2,998
Originations of mortgage finance loans	(99,799,613)	(73,661,362)
Proceeds from pay-offs of mortgage finance loans	97,725,705	73,491,735
Net increase in loans held for investment, excluding mortgage finance loans	(143,741)	(1,248,423)
Purchase of premises and equipment, net	(15,047)	(5,655)
Proceeds from sale of MSRs	0	22,439
Proceeds from sale of other real estate owned, net	79	13,645
Net cash used in investing activities	(2,338,214)	(1,483,918)
Financing activities
Net increase in deposits	6,807,190	1,262,457
Costs from issuance of stock related to stock-based awards and warrants	(1,655)	(2,396)
Preferred dividends paid	(7,313)	(7,313)
Net increase/(decrease) in other borrowings	(1,400,000)	400,000
Net increase/(decrease) in Federal funds purchased and repurchase agreements	(501,207)	121,778
Net cash provided by financing activities	4,897,015	1,774,526
Net increase/(decrease) in cash and cash equivalents	2,129,205	(120,540)
Cash and cash equivalents at beginning of period	3,080,065	2,905,591
Cash and cash equivalents at end of period	5,209,270	2,785,051
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	282,559	158,750
Cash paid during the period for income taxes	$ 85,314	$ 64,225

Operations and Summary of Signi

Operations and Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operations and Summary of Significant Accounting Policies	Operations and Summary of Significant Accounting Policies Organization and Nature of Business Texas Capital Bancshares, Inc. (the "Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the "Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional or national clientele of commercial borrowers. We are primarily a secured lender, with the majority of our loans held for investment, excluding mortgage finance loans and other national lines of business, being made to businesses headquartered or with operations in Texas. Our national lines of business provide specialized lending products to businesses throughout the United States. Basis of Presentation Our accounting and reporting policies conform to accounting principles generally accepted in the United States ("GAAP") and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation. The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2018 , included in our Annual Report on Form 10-K filed with the SEC on February 14, 2019 (the “ 2018 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period. Accounting Changes ASU 2016-02 "Leases (Topic 842)" ("ASU 2016-02") requires that lessees and lessors recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. ASU 2016-02 was effective for us on January 1, 2019. ASU 2016-02 provides for a modified retrospective transition approach requiring lessees to recognize and measure leases on the balance sheet at the beginning of either the earliest period presented or as of the beginning of the period of adoption with the option to elect certain practical expedients. We have elected to apply ASU 2016-02 as of the beginning of the period of adoption (January 1, 2019) and have not restated comparative periods. Of the optional practical expedients available under ASU 2016-02, we have adopted all expedients except for the hindsight practical expedient. Our operating leases relate primarily to office space and bank branches. As a result of implementing ASU 2016-02, we recognized an operating lease right-of-use ("ROU") asset of $64 million and an operating lease liability of $74 million on January 1, 2019, with no impact on our consolidated statement of income or consolidated statement of cash flows compared to the prior lease accounting model. The ROU asset and operating lease liability are recorded in other assets and other liabilities, respectively, in the consolidated balance sheets. See Note 7 - Leases for additional information. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of financial instruments and the status of contingencies are particularly susceptible to significant change.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The following table presents the computation of basic and diluted earnings per share: Three months ended September 30, Nine months ended September 30, (in thousands except per share data) 2019 2018 2019 2018 Numerator: Net income $ 88,141 $ 85,552 $ 248,949 $ 228,933 Preferred stock dividends 2,438 2,438 7,313 7,313 Net income available to common stockholders $ 85,703 $ 83,114 $ 241,636 $ 221,620 Denominator: Denominator for basic earnings per share—weighted average shares 50,305,844 50,163,433 50,273,485 49,853,515 Effect of employee stock-based awards(1) 110,558 207,391 119,277 240,376 Effect of warrants to purchase common stock — 10,525 — 115,537 Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions 50,416,402 50,381,349 50,392,762 50,209,428 Basic earnings per common share $ 1.70 $ 1.66 $ 4.81 $ 4.45 Diluted earnings per common share $ 1.70 $ 1.65 $ 4.80 $ 4.41 (1) SARs and RSUs outstanding of 107,615 at September 30, 2019 and 4,000 at September 30, 2018 have not been included in diluted earnings per share because to do so would have been antidilutive for the periods presented.

Investment Securities

Investment Securities	9 Months Ended
	Sep. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Investment Securities	Investment Securities Available-for-Sale Debt Securities The following is a summary of available-for-sale debt securities: (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value September 30, 2019 Available-for-sale debt securities: Residential mortgage-backed securities $ 5,594 $ 324 $ — $ 5,918 Tax-exempt asset-backed securities 183,273 14,340 — 197,613 Credit risk transfer securities 14,713 — (3,258 ) 11,455 $ 203,580 $ 14,664 $ (3,258 ) $ 214,986 December 31, 2018 Available-for-sale debt securities: Residential mortgage-backed securities $ 6,874 $ 368 $ — $ 7,242 Tax-exempt asset-backed securities 95,518 286 — 95,804 $ 102,392 $ 654 $ — $ 103,046 During the first quarter of 2019, we acquired a $92.0 million tax-exempt security backed with underlying cash flows from municipal revenue bonds, as well as $15.0 million in credit risk transfer ("CRT") securities. The securities were all recorded as available-for-sale upon acquisition and subsequently marked to fair value as of quarter end. CRT securities represent unsecured obligations issued by government sponsored entities ("GSEs") such as Freddie Mac and are designed to transfer mortgage credit risk from the GSE to private investors. CRT securities are structured to be subject to the performance of a reference pool of mortgage loans in which we share in 50% of the first losses with the GSE. If the reference pool incurs losses, the amount we will recover on the notes is reduced by our share of the amount of such losses, which could potentially be up to 100% of the amount outstanding. The CRT securities are generally interest-only for an initial period of time and are restricted from being transferred until a future date. The amortized cost and estimated fair value of available-for-sale debt securities are presented below by contractual maturity: (in thousands, except percentage data) Less Than One Year After One Through Five Years After Five Through Ten Years After Ten Years Total September 30, 2019 Available-for-sale: Residential mortgage-backed securities:(1) Amortized cost $ — $ 1,135 $ — $ 4,459 $ 5,594 Estimated fair value — 1,232 — 4,686 5,918 Weighted average yield(3) — % 5.54 % — % 4.68 % 4.86 % Tax-exempt asset-backed securities:(1) Amortized Cost — — — 183,273 183,273 Estimated fair value — — — 197,613 197,613 Weighted average yield(2)(3) — % — % — % 4.20 % 4.20 % CRT securities:(1) Amortized Cost — — — 14,713 14,713 Estimated fair value — — — 11,455 11,455 Weighted average yield(3) — % — % — % 2.15 % 2.15 % Total available-for-sale debt securities: Amortized cost $ 203,580 Estimated fair value $ 214,986 December 31, 2018 Available-for-sale: Residential mortgage-backed securities:(1) Amortized cost $ 3 $ 1,573 $ — $ 5,298 $ 6,874 Estimated fair value 4 1,668 — 5,570 7,242 Weighted average yield(3) 6.50 % 5.54 % — % 4.53 % 4.76 % Tax-exempt asset-backed securities:(1) Amortized Cost — — — 95,518 95,518 Estimated fair value — — — 95,804 95,804 Weighted average yield(2)(3) — % — % — % 4.25 % 4.25 % Total available-for-sale debt securities: Amortized cost $ 102,392 Estimated fair value $ 103,046 (1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. (2) Yields have been adjusted to a tax equivalent basis assuming a 21% federal tax rate. (3) Yields are calculated based on amortized cost. The following table discloses our available-for-sale debt securities as of September 30, 2019 that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 or more months: September 30, 2019 Less Than 12 Months 12 Months or Longer Total (in thousands) Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss CRT securities $ 11,455 $ (3,258 ) $ — $ — $ 11,455 $ (3,258 ) At September 30, 2019 , the CRT securities were the only available-for-sale debt securities in an unrealized loss position. There were no available-for-sale debt securities in an unrealized loss position at December 31, 2018. We conduct periodic reviews of securities with unrealized losses to evaluate whether the impairment is other-than-temporary. Unrealized losses that are determined to be temporary in nature are recorded, net of tax, in accumulated other comprehensive income ("AOCI") for available-for-sale debt securities. When we have the intent to sell or we believe we will more likely than not be required to sell an available-for-sale debt security, the entire excess of its amortized cost basis over its fair value is recognized in earnings. For available-for-sale debt securities that we do not intend to sell and are not likely to be required to sell, only the credit-related impairment is recognized in earnings and any non-credit-related impairment is recorded in AOCI. Based on the results of our periodic review of available-for-sale debt securities in an unrealized loss position at March 31, 2019, we recorded a $331,000 other-than-temporary credit-related impairment on the CRT securities, reducing the amortized cost of the securities. The loss was measured as the excess of the amortized costs basis of the security over the present value of cash flows expected to be collected and was recorded in other non-interest expense. Based on the results of our periodic review at September 30, 2019, no additional other-than-temporary credit-related impairment was recorded. These securities also have unrealized losses, which we do not believe are other-than-temporary. We have evaluated the near-term prospects of the investments in relation to the severity and duration of the unrealized losses and based on that evaluation have determined that we have the ability and intent to hold the investments until recovery of fair value. Available-for-sale debt securities with carrying values of approximately $3.9 million and $1.4 million were pledged to secure certain customer repurchase agreements and deposits, respectively, at September 30, 2019 . The comparative amounts at December 31, 2018 were $4.8 million and $1.7 million , respectively. Equity Securities Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. At September 30, 2019 and December 31, 2018 , we had $23.0 million and $17.2 million , respectively, in equity securities recorded at fair value. The following is a summary of unrealized and realized gains/(losses) recognized on equity securities and included in other non-interest income in the consolidated statements of income: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Net gains/(losses) recognized during the period $ 37 $ 253 $ 1,876 $ 149 Less: Realized net gains/(losses) recognized during the period on equity securities sold 111 18 87 180 Unrealized net gains/(losses) recognized during the period on equity securities still held $ (74 ) $ 235 $ 1,789 $ (31 )

Loans Held for Investment and A

Loans Held for Investment and Allowance for Loan Losses	9 Months Ended
	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans Held for Investment and Allowance for Loan Losses	Loans Held for Investment and Allowance for Loan Losses Loans held for investment are summarized by portfolio segment as follows: (in thousands) September 30, 2019 December 31, 2018 Commercial $ 10,377,952 $ 10,373,288 Mortgage finance(1) 7,951,432 5,877,524 Construction 2,641,019 2,120,966 Real estate 3,513,799 3,929,117 Consumer 68,033 63,438 Equipment leases 266,600 312,191 Gross loans held for investment 24,818,835 22,676,524 Deferred income (net of direct origination costs) (94,579 ) (108,450 ) Allowance for loan losses (190,138 ) (191,522 ) Total loans held for investment, net $ 24,534,118 $ 22,376,552 (1) Balances at September 30, 2019 and December 31, 2018 are stated net of $734.7 million and $193.0 million of participations sold, respectively. Summary of Loan Loss Experience The following tables summarize the credit risk profile of our loans held for investment by internally assigned grades and non-accrual status: (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Equipment Leases Total September 30, 2019 Grade: Pass $ 9,986,993 $ 7,951,432 $ 2,605,995 $ 3,404,146 $ 67,844 $ 266,101 $ 24,282,511 Special mention 198,186 — 19,324 73,927 150 245 291,832 Substandard-accruing 83,502 — 15,700 24,350 — 254 123,806 Non-accrual 109,271 — — 11,376 39 — 120,686 Total loans held for investment $ 10,377,952 $ 7,951,432 $ 2,641,019 $ 3,513,799 $ 68,033 $ 266,600 $ 24,818,835 December 31, 2018 Grade: Pass $ 10,034,597 $ 5,877,524 $ 2,099,955 $ 3,850,811 $ 61,815 $ 309,775 $ 22,234,477 Special mention 120,531 — 21,011 47,644 — 2,223 191,409 Substandard-accruing 140,297 — — 28,205 1,568 193 170,263 Non-accrual 77,863 — — 2,457 55 — 80,375 Total loans held for investment $ 10,373,288 $ 5,877,524 $ 2,120,966 $ 3,929,117 $ 63,438 $ 312,191 $ 22,676,524 The allowance for loan losses is comprised of general reserves and specific reserves for impaired loans based on our estimate of losses inherent in the portfolio at the balance sheet date, but not yet identified with specified loans. We believe the allowance at September 30, 2019 to be appropriate, given management's assessment of losses inherent in the portfolio as of the evaluation date, the growth in the loan and lease portfolio, current economic conditions in our market areas and other factors. The following table details activity in the allowance for loan losses, as well as the recorded investment in loans held for investment, by portfolio segment and disaggregated on the basis of our impairment methodology. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Equipment Leases Additional Qualitative Reserve Total Nine months ended September 30, 2019 Allowance for loan losses: Beginning balance $ 129,442 $ — $ 19,242 $ 33,353 $ 425 $ 1,829 $ 7,231 $ 191,522 Provision for loan losses 74,462 1,966 712 (7,916 ) (419 ) (1,491 ) (7,231 ) 60,083 Charge-offs 62,678 — — 177 — 19 — 62,874 Recoveries 1,337 — — — 60 10 — 1,407 Net charge-offs (recoveries) 61,341 — — 177 (60 ) 9 — 61,467 Ending balance $ 142,563 $ 1,966 $ 19,954 $ 25,260 $ 66 $ 329 $ — $ 190,138 Period end allowance for loan losses allocated to: Loans individually evaluated for impairment $ 26,418 $ — $ — $ 101 $ 8 $ — $ — $ 26,527 Loans collectively evaluated for impairment 116,145 1,966 19,954 25,159 58 329 — 163,611 Total $ 142,563 $ 1,966 $ 19,954 $ 25,260 $ 66 $ 329 $ — $ 190,138 Period end loans allocated to: Loans individually evaluated for impairment $ 109,271 $ — $ — $ 11,376 $ 39 $ — $ — $ 120,686 Loans collectively evaluated for impairment 10,268,681 7,951,432 2,641,019 3,502,423 67,994 266,600 — 24,698,149 Total $ 10,377,952 $ 7,951,432 $ 2,641,019 $ 3,513,799 $ 68,033 $ 266,600 $ — $ 24,818,835 Nine months ended September 30, 2018 Allowance for loan losses: Beginning balance $ 118,806 $ — $ 19,273 $ 34,287 $ 357 $ 3,542 $ 8,390 $ 184,655 Provision for loan losses 55,808 — 331 (1,635 ) 757 (1,425 ) (3,048 ) 50,788 Charge-offs 45,273 — — — 767 319 — 46,359 Recoveries 1,069 — — 43 78 32 — 1,222 Net charge-offs (recoveries) 44,204 — — (43 ) 689 287 — 45,137 Ending balance $ 130,410 $ — $ 19,604 $ 32,695 $ 425 $ 1,830 $ 5,342 $ 190,306 Period end allowance for loan losses allocated to: Loans individually evaluated for impairment $ 30,855 $ — $ — $ 70 $ 10 $ — $ — $ 30,935 Loans collectively evaluated for impairment 99,555 — 19,604 32,625 415 1,830 5,342 159,371 Total $ 130,410 $ — $ 19,604 $ 32,695 $ 425 $ 1,830 $ 5,342 $ 190,306 Period end loans allocated to: Loans individually evaluated for impairment $ 105,522 $ — $ — $ 9,057 $ 60 $ — $ — $ 114,639 Loans collectively evaluated for impairment 10,011,423 5,477,787 2,263,463 3,915,625 51,632 319,411 — 22,039,341 Total $ 10,116,945 $ 5,477,787 $ 2,263,463 $ 3,924,682 $ 51,692 $ 319,411 $ — $ 22,153,980 During 2019, we refined our methodology for calculating the allowance for loan losses to improve the specificity of the risk weights and the risk-weighting process for each product type assigned to the loans in our held for investment portfolio. As a result of these refinements, we believe that management is better able to allocate inherent losses previously accounted for in the additional qualitative reserve component of our allowance for loan losses to specific product types and credit risk grades, thus eliminating the additional qualitative reserve component of our allowance for loan losses in 2019. Additionally, this improved specificity and consideration of current mortgage market conditions resulted in the allocation of a portion of the company’s provision for loan losses to our mortgage finance loan portfolio for the first time in 2019. The following tables detail our impaired loans held for investment by portfolio segment. In accordance with ASC 310, Receivables , we have also included all restructured and formerly restructured loans in our impaired loan totals. (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized September 30, 2019 With no related allowance recorded: Commercial Business loans $ 17,420 $ 31,270 $ — $ 18,902 $ — Energy loans 18,758 28,193 — 10,340 — Real estate Market risk 8,757 8,757 — 3,750 — Commercial 908 908 — 6,500 — Secured by 1-4 family 1,220 1,220 — 1,228 — Consumer — — — — — Equipment leases — — — — — Total impaired loans with no allowance recorded $ 47,063 $ 70,348 $ — $ 40,720 $ — With an allowance recorded: Commercial Business loans $ 28,662 $ 31,730 $ 13,483 $ 24,184 $ — Energy loans 44,431 64,171 12,935 50,955 — Real estate Market risk 259 259 50 2,855 — Commercial — — — — — Secured by 1-4 family 232 232 51 750 — Consumer 39 39 8 71 — Equipment leases — — — — — Total impaired loans with an allowance recorded $ 73,623 $ 96,431 $ 26,527 $ 78,815 $ — Combined: Commercial Business loans $ 46,082 $ 63,000 $ 13,483 $ 43,086 $ — Energy loans 63,189 92,364 12,935 61,295 — Real estate Market risk 9,016 9,016 50 6,605 — Commercial 908 908 — 6,500 — Secured by 1-4 family 1,452 1,452 51 1,978 — Consumer 39 39 8 71 — Equipment leases — — — — — Total impaired loans $ 120,686 $ 166,779 $ 26,527 $ 119,535 $ — (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized December 31, 2018 With no related allowance recorded: Commercial Business loans $ 23,367 $ 55,008 $ — $ 16,426 $ 133 Energy loans 12,188 13,363 — 17,135 — Real estate Market risk — — — — — Commercial 7,388 7,388 — 3,215 — Secured by 1-4 family 1,233 1,233 — 734 — Consumer — — — — — Equipment leases — — — — — Total impaired loans with no allowance recorded $ 44,176 $ 76,992 $ — $ 37,510 $ 133 With an allowance recorded: Commercial Business loans $ 17,529 $ 17,564 $ 4,679 $ 41,307 $ — Energy loans 25,344 28,105 3,573 25,672 — Real estate Market risk — — — 49 — Commercial — — — 83 — Secured by 1-4 family 236 236 48 188 — Consumer 55 55 10 54 — Equipment leases — — — 275 — Total impaired loans with an allowance recorded $ 43,164 $ 45,960 $ 8,310 $ 67,628 $ — Combined: Commercial Business loans $ 40,896 $ 72,572 $ 4,679 $ 57,733 $ 133 Energy loans 37,532 41,468 3,573 42,807 — Real estate Market risk — — — 49 — Commercial 7,388 7,388 — 3,298 — Secured by 1-4 family 1,469 1,469 48 922 — Consumer 55 55 10 54 — Equipment leases — — — 275 — Total impaired loans $ 87,340 $ 122,952 $ 8,310 $ 105,138 $ 133 Average impaired loans outstanding during the nine months ended September 30, 2019 and 2018 totaled $119.5 million and $105.0 million , respectively. As of September 30, 2019 and December 31, 2018 , none of our non-accrual loans were earning interest income on a cash basis. The table below provides an age analysis of our loans held for investment: (in thousands) 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days(1) Total Past Due Non-accrual Current Total September 30, 2019 Commercial Business loans $ 31,313 $ 6,039 $ 19,084 $ 56,436 $ 46,082 $ 8,728,321 $ 8,830,839 Energy 30,000 4,200 7,550 41,750 63,189 1,442,174 1,547,113 Mortgage finance loans — — — — — 7,951,432 7,951,432 Construction Market risk — 15,700 — 15,700 — 2,520,335 2,536,035 Commercial — — — — — 81,159 81,159 Secured by 1-4 family — — — — — 23,825 23,825 Real estate Market risk 3,129 14,004 2,061 19,194 9,016 2,294,067 2,322,277 Commercial — — — — 908 821,323 822,231 Secured by 1-4 family 312 — 953 1,265 1,452 366,574 369,291 Consumer 277 20 — 297 39 67,697 68,033 Equipment leases — — — — — 266,600 266,600 Total loans held for investment $ 65,031 $ 39,963 $ 29,648 $ 134,642 $ 120,686 $ 24,563,507 $ 24,818,835 (1) Loans past due 90 days and still accruing includes premium finance loans of $9.2 million . These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The receipt of the refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date. As of September 30, 2019 and December 31, 2018 , we did not have any loans considered restructured that were not on non-accrual. Of the non-accrual loans at September 30, 2019 and December 31, 2018 , $15.5 million and $20.0 million , respectively, met the criteria for restructured. These loans had no unfunded commitments at their respective balance sheet dates. The following table details the recorded investment at September 30, 2019 and 2018 of loans that have been restructured during the nine months ended September 30, 2019 and 2018 by type of modification: Extended Maturity Adjusted Payment Schedule Total (in thousands, except number of contracts) Number of Contracts Balance at Period End Number of Contracts Balance at Period End Number of Contracts Balance at Period End Nine months ended September 30, 2019 Commercial: Business loans 1 $ 1,824 — $ — 1 $ 1,824 Energy loans 1 3,941 — — 1 3,941 Total 2 $ 5,765 — $ — 2 $ 5,765 Nine months ended September 30, 2018 Commercial: Business loans — $ — 2 $ 2,582 $ 2 $ 2,582 Energy loans — $ — 5 $ 12,332 5 $ 12,332 Total — $ — 7 $ 14,914 7 $ 14,914 Restructured loans generally include terms to temporarily place the loan on interest only, extend the payment terms or reduce the interest rate. We did not forgive any principal on the above restructured loans. At September 30, 2019 , all of the above loans restructured were on non-accrual. The restructuring of the loans did not have a significant impact on our allowance for loan losses at September 30, 2019 or 2018 . As of September 30, 2019 and 2018 , we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

OREO and Valuation Allowance fo

OREO and Valuation Allowance for Losses on OREO	9 Months Ended
	Sep. 30, 2019
Real Estate Owned, Disclosure of Detailed Components [Abstract]
OREO and Valuation Allowance for Losses on OREO	OREO and Valuation Allowance for Losses on OREO The table below presents a summary of the activity related to OREO: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Beginning balance $ — $ 9,526 $ 79 $ 11,742 Sales — (11,447 ) (79 ) (11,663 ) Valuation allowance for OREO — 2,000 — — Ending balance $ — $ 79 $ — $ 79

Certain Transfers of Financial

Certain Transfers of Financial Assets	9 Months Ended
	Sep. 30, 2019
Transfers and Servicing [Abstract]
Certain Transfers of Financial Assets	Certain Transfers of Financial Assets The table below presents a reconciliation of the changes in loans held for sale: Nine Months Ended September 30, (in thousands) 2019 2018 Outstanding balance(1): Beginning balance $ 1,949,785 $ 1,012,580 Loans purchased and originated 7,288,823 5,012,188 Payments and loans sold (6,571,942 ) (4,366,138 ) Ending balance 2,666,666 1,658,630 Fair value adjustment: Beginning balance 19,689 (1,576 ) Increase/(decrease) to fair value (12,130 ) (5,124 ) Ending balance 7,559 (6,700 ) Loans held for sale at fair value $ 2,674,225 $ 1,651,930 (1) Includes $7.1 million and $299,000 of loans held for sale that are carried at lower of cost or market as of September 30, 2019 and December 31, 2018 , respectively, as well as $3.3 million as of December 31, 2017 . There were no loans held for sale carried at lower of cost or market as of September 30, 2018 . No loans held for sale were on non-accrual as of September 30, 2019 or December 31, 2018 . At September 30, 2019 and December 31, 2018 , we had $9.2 million and $16.8 million , respectively, in loans held for sale that were 90 days or more past due. The $9.2 million in loans held for sale that were 90 days or more past due at September 30, 2019 included $7.3 million in loans guaranteed by U.S. government agencies that were purchased out of Ginnie Mae securities and recorded as loans held for sale, at fair value, on the balance sheet. Interest on these past due loans accrues at the debenture rate guaranteed by the U.S. government. Also included in the $9.2 million were $1.9 million in loans that, pursuant to Ginnie Mae servicing guidelines, we have the unilateral right, but not the obligation, to repurchase if defined delinquent loan criteria are met, and therefore must record as held for sale on our balance sheet regardless of whether the repurchase option has been exercised. At December 31, 2018 , $16.0 million of the $16.8 million in loans held for sale were loans guaranteed by U.S. government agencies that were purchased out of Ginnie Mae securities and recorded as loans held for sale, at fair value, on the balance sheet. From time to time we retain the right to service the loans sold through our MCA program, creating mortgage servicing rights ("MSRs") which are recorded as assets on our balance sheet. A summary of MSR activity is as follows: Nine months ended September 30, (in thousands) 2019 2018 MSRs: Balance, beginning of year $ 42,474 $ 88,150 Capitalized servicing rights 22,610 32,871 Amortization (7,599 ) (7,920 ) Sales — (26,742 ) Balance, end of period $ 57,485 $ 86,359 Valuation allowance: Balance, beginning of year $ — $ 2,823 Increase (decrease) in valuation allowance 8,360 (2,823 ) Balance, end of period $ 8,360 $ — MSRs, net $ 49,125 $ 86,359 MSRs, fair value $ 49,125 $ 98,391 At September 30, 2019 and December 31, 2018 , our servicing portfolio of residential mortgage loans had an outstanding principal balance of $5.6 billion and $3.9 billion , respectively. In connection with the servicing of these loans, we hold deposits in the name of investors representing escrow funds for taxes and insurance, as well as collections in transit to the investors. These escrow funds are segregated and held in separate non-interest-bearing bank accounts at the Bank. These deposits, included in total non-interest-bearing deposits on the consolidated balance sheets, were $75.2 million at September 30, 2019 and $37.9 million at December 31, 2018 . The estimated fair value of the MSR assets is obtained from an independent third party and reviewed by management on a quarterly basis. MSRs typically do not trade in an active, open market with readily observable prices; as such, the fair value of MSRs is determined using a discounted cash flow model to calculate the present value of the estimated future net servicing income. The assumptions utilized in the discounted cash flow model are based on market data for comparable assets, where available. Each quarter, management and the independent third party review the key assumptions used in the discounted cash flow model and make adjustments as necessary to estimate the fair value of the MSRs. At September 30, 2019 , the estimated fair value of MSRs was adjusted as a result of the decline in mortgage interest rates experienced in the first nine months of 2019, which resulted in an $8.4 million impairment charge. There was no impairment charge at December 31, 2018 . The following summarizes the assumptions used by management to determine the fair value of MSRs: September 30, 2019 December 31, 2018 Average discount rates 9.06 % 9.55 % Expected prepayment speeds 14.48 % 9.77 % Weighted-average life, in years 5.3 7.0 A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table: (in thousands) September 30, 2019 December 31, 2018 50 bp adverse change in prepayment speed $ (6,077 ) $ (6,028 ) 100 bp adverse change in prepayment speed (9,340 ) (11,629 ) These sensitivities are hypothetical and actual results may differ materially due to a number of factors. The effect on fair value of a 10% variation in assumptions generally cannot be determined with confidence because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may be correlated with changes in other factors, which could impact the sensitivity analysis as presented. In conjunction with the sale and securitization of loans held for sale, we may be exposed to liability resulting from repurchase, indemnification and make-whole agreements. Our estimated exposure related to those agreements totaled $5.4 million and $1.6 million at September 30, 2019 and December 31, 2018 , respectively, and is recorded in other liabilities in the consolidated balance sheets. We incurred $4.5 million in losses due to make-whole obligations during the nine months ended September 30, 2019 compared to $187,000 during the nine months ended September 30, 2018 . The increase in make-whole obligation losses is primarily related to an increase in early payoffs resulting from the declining interest rate environment.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Leases	Leases Operating leases in which we are the lessee are recorded as operating lease ROU assets and operating lease liabilities, included in other assets and other liabilities, respectively, on our consolidated balance sheets. We do not currently have any significant finance leases in which we are the lessee. Operating lease ROU assets represent our right to use an underlying asset during the lease term and operating lease liabilities represent our obligation to make lease payments arising from the lease. ROU assets and operating lease liabilities are recognized at lease commencement based on the present value of the remaining lease payments using a discount rate that represents our incremental borrowing rate at the lease commencement date. ROU assets are further adjusted for lease incentives. Operating lease expense, which is comprised of amortization of the ROU asset and the implicit interest accreted on the operating lease liability, is recognized on a straight-line basis over the lease term, and is recorded in net occupancy expense in the consolidated statements of income and other comprehensive income. Our leases relate primarily to office space and bank branches with remaining lease terms of generally 1 to 13 years . Certain lease arrangements contain extension options which typically range from 5 to 10 years at the then fair market rental rates. As these extension options are not generally considered reasonably certain of exercise, they are not included in the lease term. As of September 30, 2019 , operating lease ROU assets and liabilities were $84.3 million and $98.4 million , respectively. The table below summarizes our net lease cost: (in thousands) Three months ended Nine months ended September 30, 2019 Operating lease cost $ 3,836 $ 10,973 Variable lease cost 845 2,977 Sublease income (32 ) (94 ) Net lease cost $ 4,649 $ 13,856 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 3,592 $ 11,054 Non-cash changes in ROU assets $ 13,610 $ 97,898 Non-cash changes in lease liabilities(1) $ 13,610 $ 107,719 (1) Includes $4.2 million and $87.9 million in lease liabilities from new ROU assets obtained during the three and nine months ended September 30, 2019, respectively. The table below summarizes other information related to our operating leases: September 30, 2019 Weighted-average remaining lease term - operating leases, in years 7.3 Weighted-average discount rate - operating leases 2.75 % The table below summarizes the maturity of remaining lease liabilities: (in thousands) September 30, 2019 2019 $ 3,666 2020 16,518 2021 17,035 2022 16,235 2023 16,271 2024 and thereafter 39,511 Total lease payments 109,236 Less: Interest (10,824 ) Present value of lease liabilities $ 98,412

Financial Instruments with Off-

Financial Instruments with Off-Balance Sheet Risk	9 Months Ended
	Sep. 30, 2019
Risks and Uncertainties [Abstract]
Financial Instruments with Off-Balance Sheet Risk	Financial Instruments with Off-Balance Sheet Risk The table below presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments. This allowance is recorded in other liabilities on the consolidated balance sheet. Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Beginning balance of allowance for off-balance sheet credit losses $ 10,790 $ 10,458 $ 11,434 $ 9,071 Provision for off-balance sheet credit losses (1,439 ) (175 ) (2,083 ) 1,212 Ending balance of allowance for off-balance sheet credit losses $ 9,351 $ 10,283 $ 9,351 $ 10,283 (in thousands) September 30, 2019 December 31, 2018 Commitments to extend credit - period end balance $ 8,139,889 $ 8,030,198 Standby letters of credit - period end balance $ 277,832 $ 236,537

Regulatory Restrictions

Regulatory Restrictions	9 Months Ended
	Sep. 30, 2019
Regulatory Capital Requirements [Abstract]
Regulatory Restrictions	Regulatory Restrictions The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory (and possibly additional discretionary) actions by regulators that, if undertaken, could have a direct material adverse effect on the Company’s and the Bank’s financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Company and the Bank must meet specific capital guidelines that involve quantitative measures of the Company’s and the Bank’s assets, liabilities, and certain off-balance sheet items as calculated under regulatory accounting practices. The Company’s and the Bank’s capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. The Basel III regulatory capital framework (the "Basel III Capital Rules") adopted by U.S. federal regulatory authorities, among other things, (i) establishes the capital measure called "Common Equity Tier 1" ("CET1"), (ii) specifies that Tier 1 capital consist of CET1 and "Additional Tier 1 Capital" instruments meeting stated requirements, (iii) requires that most deductions/adjustments to regulatory capital measures be made to CET1 and not to other components of capital and (iv) defines the scope of the deductions/adjustments to the capital measures. The Basel III Capital Rules became effective for us on January 1, 2015 with certain transition provisions that fully phased in beginning on January 1, 2019. Additionally, the Basel III Capital Rules require that we maintain a capital conservation buffer with respect to each of CET1, Tier 1 and total capital to risk-weighted assets, which provides for capital levels that exceed the minimum risk-based capital adequacy requirements. The capital conservation buffer is subject to a three year phase-in period that began on January 1, 2016 and was fully phased-in on January 1, 2019 at 2.5% . The required phase-in capital conservation buffer during 2018 was 1.875% . A financial institution with a conservation buffer of less than the required amount is subject to limitations on capital distributions, including dividend payments and stock repurchases, and certain discretionary bonus payments to executive officers. Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of CET1, Tier 1 and total capital to risk-weighted assets, and of Tier 1 capital to average assets, each as defined in the regulations. Management believes, as of September 30, 2019 , that the Company and the Bank meet all capital adequacy requirements to which they are subject. Financial institutions are categorized as well capitalized or adequately capitalized, based on minimum total risk-based, Tier 1 risk-based, CET1 and Tier 1 leverage ratios. As shown in the table below, the Company’s capital ratios exceeded the regulatory definition of adequately capitalized as of September 30, 2019 and December 31, 2018 . Based upon the information in its most recently filed call report, the Bank met the capital ratios necessary to be well capitalized. The regulatory authorities can apply changes in classification of assets and such changes may retroactively subject the Company to changes in capital ratios. Any such change could reduce one or more capital ratios below well-capitalized status. In addition, a change may result in imposition of additional assessments by the FDIC or could result in regulatory actions that could have a material adverse effect on our financial condition and results of operations. Because our Bank had less than $15.0 billion in total consolidated assets as of December 31, 2009, we are allowed to continue to classify our trust preferred securities, all of which were issued prior to May 19, 2010, as Tier 1 capital. The table below summarizes our actual and required capital ratios under the Basel III Capital Rules: Actual Minimum Capital Required - Basel III Phase-In Schedule Minimum capital Required - Basel III Fully Phased-In Required to be Considered Well Capitalized (dollars in thousands) Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio September 30, 2019 CET1 Company $ 2,579,029 8.59 % N/A N/A $ 2,102,394 7.00 % N/A N/A Bank 2,598,906 8.66 % N/A N/A 2,101,222 7.00 % 1,951,135 6.50 % Total capital (to risk-weighted assets) Company 3,318,598 11.05 % N/A N/A 3,153,591 10.50 % N/A N/A Bank 3,179,785 10.59 % N/A N/A 3,151,833 10.50 % 3,001,746 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,837,070 9.45 % N/A N/A 2,552,907 8.50 % N/A N/A Bank 2,756,947 9.18 % N/A N/A 2,551,484 8.50 % 2,401,397 8.00 % Tier 1 capital (to average assets)(1) Company 2,837,070 8.63 % N/A N/A 1,314,356 4.00 % N/A N/A Bank 2,756,947 8.39 % N/A N/A 1,313,883 4.00 % 1,642,353 5.00 % December 31, 2018 CET1 Company $ 2,330,599 8.58 % $ 1,732,501 6.38 % $ 1,902,354 7.00 % N/A N/A Bank 2,340,988 8.62 % 1,731,955 6.38 % 1,901,755 7.00 % 1,765,915 6.50 % Total capital (to risk-weighted assets) Company 3,074,097 11.31 % 2,683,679 9.88 % 2,853,532 10.50 % N/A N/A Bank 2,925,872 10.77 % 2,682,833 9.88 % 2,852,632 10.50 % 2,716,793 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,589,374 9.53 % 2,140,149 7.88 % 2,310,002 8.50 % N/A N/A Bank 2,499,763 9.20 % 2,139,474 7.88 % 2,309,274 8.50 % 2,173,434 8.00 % Tier 1 capital (to average assets)(1) Company 2,589,374 9.87 % 1,049,694 4.00 % 1,049,694 4.00 % N/A N/A Bank 2,499,763 9.53 % 1,049,296 4.00 % 1,049,296 4.00 % 1,311,620 5.00 % (1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum. Our mortgage finance loan volumes can increase significantly at month-end, causing a meaningful difference between ending balance and average balance for any period. At September 30, 2019 , our mortgage finance loans were $8.0 billion compared to the average for the quarter ended September 30, 2019 of $8.1 billion . As CET1, Tier 1 and total capital ratios are calculated using quarter-end risk-weighted assets and our mortgage finance loans are 100% risk-weighted (excluding MCA mortgage loans held for sale, which receive lower risk weights), the period-end fluctuation in these balances can significantly impact our reported ratios. Due to the actual risk profile and liquidity of this asset class, we manage capital allocated to mortgage finance loans based on changing trends in average balances and do not believe that the period-end balance is representative of risk characteristics that would justify higher allocations. However, we monitor our capital allocation to confirm that all capital levels remain above well-capitalized levels. Dividends that may be paid by banks are routinely restricted by various regulatory authorities. The amount that can be paid in any calendar year without prior approval of our Bank’s regulatory agencies cannot exceed the lesser of the net profits (as defined) for that year plus the net profits for the preceding two calendar years, or retained earnings. The Basel III Capital Rules further limit the amount of dividends that may be paid by our Bank. No dividends were declared or paid on our common stock during the nine months ended September 30, 2019 , or 2018 .

Stock-based Compensation

Stock-based Compensation	9 Months Ended
	Sep. 30, 2019
Compensation Related Costs [Abstract]
Stock-based Compensation	Stock-based Compensation We have long-term incentive plans under which stock-based compensation awards are granted to employees and directors by the board of directors, or its designated committee. Grants are subject to vesting requirements and may include, among other things, nonqualified stock options, stock appreciation rights ("SARs"), restricted stock units ("RSUs"), restricted stock and performance units, or any combination thereof. There are 2,550,000 total shares authorized for grant under the plans. The table below summarizes our stock-based compensation expense for the three and nine months ended September 30, 2019 and 2018 : Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Stock-settled awards: SARs $ — $ 19 $ 6 $ 112 RSUs 3,015 2,261 8,532 6,235 Restricted stock 8 12 27 36 Cash-settled performance units 1,005 2,144 4,408 9,250 Total $ 4,028 $ 4,436 $ 12,973 $ 15,633 (in thousands except period data) September 30, 2019 Unrecognized compensation expense related to unvested stock-settled awards $ 26,435 Weighted average period over which expense is expected to be recognized, in years 3.1

Fair Value Disclosures

Fair Value Disclosures	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Disclosures	Fair Value Disclosures We determine the fair market values of our assets and liabilities measured at fair value on a recurring and nonrecurring basis using the fair value hierarchy as prescribed in ASC 820. The standard describes three levels of inputs that may be used to measure fair value as provided below. Level 1 Quoted prices in active markets for identical assets or liabilities. Level 2 Observable inputs other than Level 1 prices, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair values requires significant management judgment or estimation. Assets and liabilities measured at fair value are as follows: Fair Value Measurements Using (in thousands) Level 1 Level 2 Level 3 September 30, 2019 Available-for-sale debt securities:(1) Residential mortgage-backed securities $ — $ 5,918 $ — Tax-exempt asset-backed securities — — 197,613 CRT securities — — 11,455 Equity securities(1)(2) 15,890 7,146 — Loans held for sale(3) — 2,657,969 9,198 Loans held for investment(4)(6) — — 56,993 Derivative assets(7) — 62,726 — Derivative liabilities(7) — 60,393 — Non-qualified deferred compensation plan liabilities(8) 16,790 — — December 31, 2018 Available-for-sale debt securities:(1) Residential mortgage-backed securities $ — $ 7,242 $ — Tax-exempt asset-backed securities — — 95,804 Equity securities(1)(2) 10,262 6,908 — Loans held for sale(3) — 1,952,760 16,415 Loans held for investment(4)(6) — — 29,885 OREO(5)(6) — — 79 Derivative assets(7) — 21,806 — Derivative liabilities(7) — 41,375 — Non-qualified deferred compensation plan liabilities(8) 10,148 — — (1) Securities are measured at fair value on a recurring basis, generally monthly, except for tax-exempt asset-backed securities and CRT securities which are measured quarterly. (2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. (3) Loans held for sale purchased through our MCA program are measured at fair value on a recurring basis, generally monthly. (4) Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral. (5) OREO is transferred from loans to OREO at fair value less selling costs. (6) Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions. (7) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly. (8) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which generally corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly. Level 3 Valuations The following table presents a reconciliation of the level 3 fair value category measured at fair value on a recurring basis: Net Realized/Unrealized Gains (Losses) (in thousands) Balance at Beginning of Period Purchases / Additions Sales / Reductions Realized Unrealized Balance at End of Period Three months ended September 30, 2019 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 201,339 $ — $ (4,116 ) $ — $ 390 $ 197,613 CRT securities $ 10,953 $ — $ — $ — $ 502 $ 11,455 Loans held for sale(2) $ 10,930 $ — $ (2,056 ) $ 102 $ 222 $ 9,198 Three months ended September 30, 2018 Tax-exempt asset-backed securities(1) $ — $ 95,521 $ — $ — $ (2,152 ) $ 93,369 Loans held for sale(2) $ 27,929 $ 901 $ (6,948 ) $ (134 ) $ 165 $ 21,913 Nine months ended September 30, 2019 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 95,804 $ 92,010 $ (4,254 ) $ — $ 14,053 $ 197,613 CRT securities $ — $ 15,044 $ — $ (331 ) $ (3,258 ) $ 11,455 Loans held for sale(2) $ 16,415 $ — $ (8,466 ) $ 450 $ 799 $ 9,198 Nine months ended September 30, 2018 Tax-exempt asset-backed securities(1) $ — $ 95,521 $ — $ — $ (2,152 ) $ 93,369 Loans held for sale(2) $ — $ 38,430 $ (14,936 ) $ (66 ) $ (1,515 ) $ 21,913 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI. Realized gains/(losses) are recorded in other non-interest income. (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in gain/(loss) on sale of loans held for sale. Tax-exempt asset-backed securities The fair value of tax-exempt asset-backed securities is based on a discounted cash flow model, which utilizes Level 3, or unobservable, inputs, the most significant of which were a discount rate and weighted-average life. At September 30, 2019 , a discount rate of 3.01% and a weighted-average life of 7.3 years were utilized to determine the fair value of these securities, compared to 4.21% and 9.2 years, respectively, at December 31, 2018 . CRT securities The fair value of CRT securities is based on a discounted cash flow model, which utilizes Level 3, or unobservable, inputs, the most significant of which were a discount rate and weighted-average life. At September 30, 2019 , a discount rate of 4.75% and a weighted-average life of 9.5 years were utilized to determine the fair value of these securities. Loans held for sale The fair value of loans held for sale using Level 3 inputs include loans that cannot be sold through normal sale channels and thus require significant management judgment or estimation when determining the fair value. The fair value of such loans is generally based upon quoted prices of comparable loans with a liquidity discount applied. At September 30, 2019 , the fair value of these loans was calculated using a weighted-average discounted price of 95.3% compared to 92.9% at December 31, 2018 . Loans held for investment Certain impaired loans held for investment are reported at fair value through a specific valuation allowance allocation of the allowance for loan losses based upon the fair value of the underlying collateral. The $57.0 million fair value of loans held for investment at September 30, 2019 reported above includes impaired loans held for investment with a carrying value of $72.6 million that were reduced by specific valuation allowance allocations totaling $15.6 million based on collateral valuations utilizing Level 3 inputs. The $29.9 million fair value of loans held for investment at December 31, 2018 reported above includes impaired loans with a carrying value of $32.2 million that were reduced by specific valuation allowance allocations totaling $2.3 million based on collateral valuations utilizing Level 3 inputs. OREO Certain foreclosed assets, upon initial recognition, are recorded at fair value less estimated selling costs. At December 31, 2018 , OREO had a carrying value of $79,000 , with no specific valuation allowance. The fair value of OREO was computed based on third party appraisals, which are Level 3 inputs. Fair Value of Financial Instruments GAAP requires disclosure of fair value information about financial instruments, whether or not recognized on the balance sheet, for which it is practical to estimate that value. In cases where quoted market prices are not available, fair values are based on estimates using present value or other valuation techniques. Those techniques are significantly affected by the assumptions used, including the discount rate and estimates of future cash flows. This disclosure does not and is not intended to represent the fair value of the Company. A summary of the carrying amounts and estimated fair values of financial instruments is as follows: September 30, 2019 December 31, 2018 (in thousands) Carrying Amount Estimated Fair Value Carrying Estimated Financial assets: Level 1 inputs: Cash and cash equivalents $ 5,209,270 $ 5,209,270 $ 3,080,065 $ 3,080,065 Investment securities 15,890 15,890 10,262 10,262 Level 2 inputs: Investment securities 13,064 13,064 14,150 14,150 Loans held for sale 2,657,969 2,657,969 1,953,059 1,953,059 Derivative assets 62,726 62,726 21,806 21,806 Level 3 inputs: Investment securities 209,068 209,068 95,804 95,804 Loans held for sale 9,198 9,198 16,415 16,415 Loans held for investment, net 24,534,118 24,564,623 22,376,552 22,347,876 Financial liabilities: Level 2 inputs: Federal funds purchased 127,800 127,800 629,169 629,169 Customer repurchase agreements 12,167 12,167 12,005 12,005 Other borrowings 2,500,000 2,500,000 3,900,000 3,900,000 Subordinated notes 282,038 293,472 281,767 283,349 Trust preferred subordinated debentures 113,406 113,406 113,406 113,406 Derivative liabilities 60,393 60,393 41,375 41,375 Level 3 inputs: Deposits 27,413,303 27,420,277 20,606,113 20,608,494 The estimated fair value for cash and cash equivalents, variable rate loans and variable rate debt approximates carrying value. The following methods and assumptions were used by the Company in estimating its fair value disclosures for financial instruments: Investment Securities Within the investment securities portfolio, we hold equity securities related to our non-qualified deferred compensation plan that are valued using quoted market prices for identical equity securities in an active market, and are classified as Level 1 assets in the fair value hierarchy. The fair value of the remaining equity securities and residential mortgage-backed securities in our investment portfolio are based on prices obtained from independent pricing services that are based on quoted market prices for the same or similar securities, and are characterized as Level 2 assets in the fair value hierarchy. We have obtained documentation from our primary pricing service regarding their processes and controls applicable to pricing investment securities, and on a quarterly basis we independently verify the prices that we receive from the service provider using two additional independent pricing sources. We also hold tax-exempt asset-backed securities and CRT securities that are valued using a discounted cash flow model, which utilizes Level 3 inputs, and are classified as Level 3 assets in the fair value hierarchy. Loans Held for Sale Fair value for loans held for sale is derived from quoted market prices for similar loans, in which case they are characterized as Level 2 assets in the fair value hierarchy, or is derived from third party pricing models, in which case they are characterized as Level 3 assets in the fair value hierarchy. Derivatives The estimated fair value of interest rate swaps and caps is obtained from independent pricing services based on quoted market prices for similar derivative contracts and these financial instruments are characterized as Level 2 assets and liabilities in the fair value hierarchy. On a quarterly basis, we independently verify the fair value using an additional independent pricing source. Foreign currency forward contracts are valued based upon quoted market prices obtained from independent pricing services for similar derivative contracts. As such, these financial instruments are characterized as Level 2 assets and liabilities in the fair value hierarchy. The derivative instruments related to the loans held for sale portfolio include loan purchase commitments and forward sales commitments. Loan purchase commitments are valued based upon the fair value of the underlying mortgage loans to be purchased, which is based on observable market data for similar loans. Forward sales commitments are valued based upon quoted market prices from brokers. As such, these loan purchase commitments and forward sales commitments are characterized as Level 2 assets or liabilities in the fair value hierarchy.

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The notional amounts and estimated fair values of derivative positions outstanding are presented in the following table: September 30, 2019 December 31, 2018 Estimated Fair Value Estimated Fair Value (in thousands) Notional Amount Asset Derivative Liability Derivative Notional Amount Asset Derivative Liability Derivative Non-hedging derivatives: Financial institution counterparties: Commercial loan/lease interest rate swaps $ 1,540,248 $ 94 $ 58,347 $ 1,579,328 $ 7,978 $ 16,719 Commercial loan/lease interest rate caps 627,149 43 — 606,950 1,109 4 Foreign currency forward contracts 2,954 37 6 39,737 2,263 59 Customer counterparties: Commercial loan/lease interest rate swaps 1,540,248 58,347 94 1,579,328 16,719 7,978 Commercial loan/lease interest rate caps 627,149 — 43 606,950 4 1,109 Foreign currency forward contracts 2,954 6 37 39,737 59 2,263 Economic hedging interest rate derivatives: Loan purchase commitments 580,472 3,590 150 167,984 1,442 6 Forward sale commitments 2,747,284 703 1,810 1,928,527 — 21,005 Gross derivatives 62,820 60,487 29,574 49,143 Offsetting derivative assets/liabilities (94 ) (94 ) (7,768 ) (7,768 ) Net derivatives included in the consolidated balance sheets $ 62,726 $ 60,393 $ 21,806 $ 41,375 The weighted-average received and paid interest rates for interest rate swaps outstanding were as follows: September 30, 2019 Weighted-Average Interest Rate December 31, 2018 Weighted-Average Interest Rate Received Paid Received Paid Non-hedging interest rate swaps 4.03 % 3.56 % 4.24 % 4.20 % The weighted-average strike rate for outstanding interest rate caps was 3.30% at September 30, 2019 and 3.20% at December 31, 2018 . Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In some cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceeds a nominal amount. Our credit exposure associated with these instruments, net of any collateral pledged, was approximately $62.7 million at September 30, 2019 and approximately $18.7 million at December 31, 2018 . Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap and cap values, as well as for changes in the value of forward sale commitments. At September 30, 2019 , we had $67.0 million in cash collateral pledged for these derivatives, of which $66.6 million was included in interest-bearing deposits in other banks and $410,000 was included in accrued interest receivable and other assets. At December 31, 2018 , we had $25.3 million in cash collateral pledged for these derivatives, of which $11.2 million was included in interest-bearing deposits and $14.1 million was included in accrued interest receivable and other assets. We also enter into credit risk participation agreements with financial institution counterparties for interest rate swaps related to loans in which we are either a participant or a lead bank. The risk participation agreements entered into by us as a participant bank provide credit protection to the financial institution counterparty should the borrower fail to perform on its interest rate derivative contract with that financial institution. We are party to 12 risk participation agreements where we are a participant bank with a notional amount of $143.0 million at September 30, 2019 , compared to 13 risk participation agreements having a notional amount of $149.1 million at December 31, 2018 . The maximum estimated exposure to these agreements, assuming 100% default by all obligors, was approximately $4.3 million at September 30, 2019 and $1.5 million at December 31, 2018 . The fair value of these exposures was insignificant to the consolidated financial statements at both September 30, 2019 and December 31, 2018 . Risk participation agreements entered into by us as the lead bank provide credit protection to us should the borrower fail to perform on its interest rate derivative contract with us. We are party to 13 risk participation agreements where we are the lead bank having a notional amount of $166.7 million at September 30, 2019 , compared to 9 agreements having a notional amount of $114.8 million at December 31, 2018 .

New Accounting Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2019
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	New Accounting Standards ASU 2019-01 "Leases (Topic 842)" ("ASU 2019-1") provides clarifications to increase transparency and comparability among organizations by recognizing lease assets and liabilities on the balance sheet and disclosing essential information about leasing transactions. Specifically, ASU 2019-01 (i) allows the fair value of the underlying asset reported by lessors that are not manufacturers or dealers to continue to be its cost and not fair value as measured under the fair value definition, (ii) allows for the cash flows received for sales-type and direct financing leases to continue to be presented as results from investing, and (iii) clarifies that entities do not have to disclose the effect of the lease standard on adoption year interim amounts. ASU 2019-01 will be effective for us on January 1, 2020 and will not have any material impact on our consolidated financial statements. ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326)" ("ASU 2016-13") requires an entity to utilize a new impairment model known as the current expected credit loss ("CECL") model to estimate its lifetime "expected credit loss" and record an allowance that, when deducted from the amortized cost basis of the financial asset, presents the net amount expected to be collected on the financial asset. The CECL model is expected to result in more timely recognition of credit losses. ASU 2016-13 also requires new disclosures for financial assets measured at amortized cost, loans and available-for-sale debt securities. Entities will apply the standard's provisions as a cumulative-effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is adopted. ASU 2016-13 will be effective for us on January 1, 2020. We continue to evaluate the impact adoption of ASU 2016-13 will have on our consolidated financial statements and disclosures, and while we are currently unable to reasonably estimate the impact of adopting ASU 2016-13, we expect that the impact of adoption could be significantly influenced by the composition, characteristics and quality of our loan portfolio as well as the prevailing economic conditions and forecasts as of the adoption date. As part of our evaluation process, we have established a steering committee and working group that includes individuals from various functional areas to implement this new accounting standard. Early implementation activities focused on data capture and portfolio segmentation and were substantially completed during the third quarter of 2019. Additionally, our primary model/tool was validated during the third quarter, enabling us to complete a parallel run using second quarter 2019 data. Completion of a parallel run using third quarter 2019 data will be completed early in the fourth quarter. During the third quarter, we continued validation of our reasonable and supportable forecast model, as well as refinement and documentation of our end-to-end processes, which we expect to be completed during the fourth quarter of 2019.

Operations and Summary of Sig_2

Operations and Summary of Significant Accounting Policies Operations and Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization And Nature Of Business	Organization and Nature of Business Texas Capital Bancshares, Inc. (the "Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the "Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional or national clientele of commercial borrowers. We are primarily a secured lender, with the majority of our loans held for investment, excluding mortgage finance loans and other national lines of business, being made to businesses headquartered or with operations in Texas. Our national lines of business provide specialized lending products to businesses throughout the United States.
Basis of Accounting	Basis of Presentation Our accounting and reporting policies conform to accounting principles generally accepted in the United States ("GAAP") and to generally accepted practices within the banking industry. Certain prior period balances have been reclassified to conform to the current period presentation. The consolidated interim financial statements are unaudited and certain information and footnote disclosures presented in accordance with GAAP have been condensed or omitted. In the opinion of management, the interim financial statements include all normal and recurring adjustments and the disclosures made are adequate to make the interim financial information not misleading. The consolidated financial statements have been prepared in accordance with GAAP for interim financial information and the instructions to Form 10-Q adopted by the Securities and Exchange Commission (“SEC”). Accordingly, the financial statements do not include all of the information and footnotes required by GAAP for complete financial statements and should be read in conjunction with our consolidated financial statements, and notes thereto, for the year ended December 31, 2018 , included in our Annual Report on Form 10-K filed with the SEC on February 14, 2019 (the “ 2018 Form 10-K”). Operating results for the interim periods disclosed herein are not necessarily indicative of the results that may be expected for a full year or any future period.
New Accounting Pronouncements	Accounting Changes ASU 2016-02 "Leases (Topic 842)" ("ASU 2016-02") requires that lessees and lessors recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. ASU 2016-02 was effective for us on January 1, 2019. ASU 2016-02 provides for a modified retrospective transition approach requiring lessees to recognize and measure leases on the balance sheet at the beginning of either the earliest period presented or as of the beginning of the period of adoption with the option to elect certain practical expedients. We have elected to apply ASU 2016-02 as of the beginning of the period of adoption (January 1, 2019) and have not restated comparative periods. Of the optional practical expedients available under ASU 2016-02, we have adopted all expedients except for the hindsight practical expedient. Our operating leases relate primarily to office space and bank branches. As a result of implementing ASU 2016-02, we recognized an operating lease right-of-use ("ROU") asset of $64 million and an operating lease liability of $74 million on January 1, 2019, with no impact on our consolidated statement of income or consolidated statement of cash flows compared to the prior lease accounting model. The ROU asset and operating lease liability are recorded in other assets and other liabilities, respectively, in the consolidated balance sheets. See Note 7 - Leases for additional information.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of financial instruments and the status of contingencies are particularly susceptible to significant change.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Schedule of computation of basic and diluted earnings per share	The following table presents the computation of basic and diluted earnings per share: Three months ended September 30, Nine months ended September 30, (in thousands except per share data) 2019 2018 2019 2018 Numerator: Net income $ 88,141 $ 85,552 $ 248,949 $ 228,933 Preferred stock dividends 2,438 2,438 7,313 7,313 Net income available to common stockholders $ 85,703 $ 83,114 $ 241,636 $ 221,620 Denominator: Denominator for basic earnings per share—weighted average shares 50,305,844 50,163,433 50,273,485 49,853,515 Effect of employee stock-based awards(1) 110,558 207,391 119,277 240,376 Effect of warrants to purchase common stock — 10,525 — 115,537 Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions 50,416,402 50,381,349 50,392,762 50,209,428 Basic earnings per common share $ 1.70 $ 1.66 $ 4.81 $ 4.45 Diluted earnings per common share $ 1.70 $ 1.65 $ 4.80 $ 4.41 (1) SARs and RSUs outstanding of 107,615 at September 30, 2019 and 4,000 at September 30, 2018 have not been included in diluted earnings per share because to do so would have been antidilutive for the periods presented.

Investment Securities (Tables)

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Securities, Available-for-sale [Abstract]
Summary of securities	The following is a summary of available-for-sale debt securities: (in thousands) Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value September 30, 2019 Available-for-sale debt securities: Residential mortgage-backed securities $ 5,594 $ 324 $ — $ 5,918 Tax-exempt asset-backed securities 183,273 14,340 — 197,613 Credit risk transfer securities 14,713 — (3,258 ) 11,455 $ 203,580 $ 14,664 $ (3,258 ) $ 214,986 December 31, 2018 Available-for-sale debt securities: Residential mortgage-backed securities $ 6,874 $ 368 $ — $ 7,242 Tax-exempt asset-backed securities 95,518 286 — 95,804 $ 102,392 $ 654 $ — $ 103,046
Schedule of amortized cost and estimated fair value of securities	The amortized cost and estimated fair value of available-for-sale debt securities are presented below by contractual maturity: (in thousands, except percentage data) Less Than One Year After One Through Five Years After Five Through Ten Years After Ten Years Total September 30, 2019 Available-for-sale: Residential mortgage-backed securities:(1) Amortized cost $ — $ 1,135 $ — $ 4,459 $ 5,594 Estimated fair value — 1,232 — 4,686 5,918 Weighted average yield(3) — % 5.54 % — % 4.68 % 4.86 % Tax-exempt asset-backed securities:(1) Amortized Cost — — — 183,273 183,273 Estimated fair value — — — 197,613 197,613 Weighted average yield(2)(3) — % — % — % 4.20 % 4.20 % CRT securities:(1) Amortized Cost — — — 14,713 14,713 Estimated fair value — — — 11,455 11,455 Weighted average yield(3) — % — % — % 2.15 % 2.15 % Total available-for-sale debt securities: Amortized cost $ 203,580 Estimated fair value $ 214,986 December 31, 2018 Available-for-sale: Residential mortgage-backed securities:(1) Amortized cost $ 3 $ 1,573 $ — $ 5,298 $ 6,874 Estimated fair value 4 1,668 — 5,570 7,242 Weighted average yield(3) 6.50 % 5.54 % — % 4.53 % 4.76 % Tax-exempt asset-backed securities:(1) Amortized Cost — — — 95,518 95,518 Estimated fair value — — — 95,804 95,804 Weighted average yield(2)(3) — % — % — % 4.25 % 4.25 % Total available-for-sale debt securities: Amortized cost $ 102,392 Estimated fair value $ 103,046 (1) Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. (2) Yields have been adjusted to a tax equivalent basis assuming a 21% federal tax rate. (3) Yields are calculated based on amortized cost.
Summary of unrealized and realized gains/(losses) recognized in net income on equity securities	The following is a summary of unrealized and realized gains/(losses) recognized on equity securities and included in other non-interest income in the consolidated statements of income: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Net gains/(losses) recognized during the period $ 37 $ 253 $ 1,876 $ 149 Less: Realized net gains/(losses) recognized during the period on equity securities sold 111 18 87 180 Unrealized net gains/(losses) recognized during the period on equity securities still held $ (74 ) $ 235 $ 1,789 $ (31 )

Loans Held for Investment and_2

Loans Held for Investment and Allowance for Loan Losses (Tables)	9 Months Ended
	Sep. 30, 2019
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of loans held for investments	Loans held for investment are summarized by portfolio segment as follows: (in thousands) September 30, 2019 December 31, 2018 Commercial $ 10,377,952 $ 10,373,288 Mortgage finance(1) 7,951,432 5,877,524 Construction 2,641,019 2,120,966 Real estate 3,513,799 3,929,117 Consumer 68,033 63,438 Equipment leases 266,600 312,191 Gross loans held for investment 24,818,835 22,676,524 Deferred income (net of direct origination costs) (94,579 ) (108,450 ) Allowance for loan losses (190,138 ) (191,522 ) Total loans held for investment, net $ 24,534,118 $ 22,376,552 (1) Balances at September 30, 2019 and December 31, 2018 are stated net of $734.7 million and $193.0 million of participations sold, respectively.
Schedule of the credit risk profile of loan portfolio by internally assigned grades and nonaccrual status	The following tables summarize the credit risk profile of our loans held for investment by internally assigned grades and non-accrual status: (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Equipment Leases Total September 30, 2019 Grade: Pass $ 9,986,993 $ 7,951,432 $ 2,605,995 $ 3,404,146 $ 67,844 $ 266,101 $ 24,282,511 Special mention 198,186 — 19,324 73,927 150 245 291,832 Substandard-accruing 83,502 — 15,700 24,350 — 254 123,806 Non-accrual 109,271 — — 11,376 39 — 120,686 Total loans held for investment $ 10,377,952 $ 7,951,432 $ 2,641,019 $ 3,513,799 $ 68,033 $ 266,600 $ 24,818,835 December 31, 2018 Grade: Pass $ 10,034,597 $ 5,877,524 $ 2,099,955 $ 3,850,811 $ 61,815 $ 309,775 $ 22,234,477 Special mention 120,531 — 21,011 47,644 — 2,223 191,409 Substandard-accruing 140,297 — — 28,205 1,568 193 170,263 Non-accrual 77,863 — — 2,457 55 — 80,375 Total loans held for investment $ 10,373,288 $ 5,877,524 $ 2,120,966 $ 3,929,117 $ 63,438 $ 312,191 $ 22,676,524
Schedule of activity in the reserve for loan losses by portfolio segment	The following table details activity in the allowance for loan losses, as well as the recorded investment in loans held for investment, by portfolio segment and disaggregated on the basis of our impairment methodology. Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Equipment Leases Additional Qualitative Reserve Total Nine months ended September 30, 2019 Allowance for loan losses: Beginning balance $ 129,442 $ — $ 19,242 $ 33,353 $ 425 $ 1,829 $ 7,231 $ 191,522 Provision for loan losses 74,462 1,966 712 (7,916 ) (419 ) (1,491 ) (7,231 ) 60,083 Charge-offs 62,678 — — 177 — 19 — 62,874 Recoveries 1,337 — — — 60 10 — 1,407 Net charge-offs (recoveries) 61,341 — — 177 (60 ) 9 — 61,467 Ending balance $ 142,563 $ 1,966 $ 19,954 $ 25,260 $ 66 $ 329 $ — $ 190,138 Period end allowance for loan losses allocated to: Loans individually evaluated for impairment $ 26,418 $ — $ — $ 101 $ 8 $ — $ — $ 26,527 Loans collectively evaluated for impairment 116,145 1,966 19,954 25,159 58 329 — 163,611 Total $ 142,563 $ 1,966 $ 19,954 $ 25,260 $ 66 $ 329 $ — $ 190,138 Period end loans allocated to: Loans individually evaluated for impairment $ 109,271 $ — $ — $ 11,376 $ 39 $ — $ — $ 120,686 Loans collectively evaluated for impairment 10,268,681 7,951,432 2,641,019 3,502,423 67,994 266,600 — 24,698,149 Total $ 10,377,952 $ 7,951,432 $ 2,641,019 $ 3,513,799 $ 68,033 $ 266,600 $ — $ 24,818,835 Nine months ended September 30, 2018 Allowance for loan losses: Beginning balance $ 118,806 $ — $ 19,273 $ 34,287 $ 357 $ 3,542 $ 8,390 $ 184,655 Provision for loan losses 55,808 — 331 (1,635 ) 757 (1,425 ) (3,048 ) 50,788 Charge-offs 45,273 — — — 767 319 — 46,359 Recoveries 1,069 — — 43 78 32 — 1,222 Net charge-offs (recoveries) 44,204 — — (43 ) 689 287 — 45,137 Ending balance $ 130,410 $ — $ 19,604 $ 32,695 $ 425 $ 1,830 $ 5,342 $ 190,306 Period end allowance for loan losses allocated to: Loans individually evaluated for impairment $ 30,855 $ — $ — $ 70 $ 10 $ — $ — $ 30,935 Loans collectively evaluated for impairment 99,555 — 19,604 32,625 415 1,830 5,342 159,371 Total $ 130,410 $ — $ 19,604 $ 32,695 $ 425 $ 1,830 $ 5,342 $ 190,306 Period end loans allocated to: Loans individually evaluated for impairment $ 105,522 $ — $ — $ 9,057 $ 60 $ — $ — $ 114,639 Loans collectively evaluated for impairment 10,011,423 5,477,787 2,263,463 3,915,625 51,632 319,411 — 22,039,341 Total $ 10,116,945 $ 5,477,787 $ 2,263,463 $ 3,924,682 $ 51,692 $ 319,411 $ — $ 22,153,980
Schedule of impaired loans, by portfolio class	The following tables detail our impaired loans held for investment by portfolio segment. In accordance with ASC 310, Receivables , we have also included all restructured and formerly restructured loans in our impaired loan totals. (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized September 30, 2019 With no related allowance recorded: Commercial Business loans $ 17,420 $ 31,270 $ — $ 18,902 $ — Energy loans 18,758 28,193 — 10,340 — Real estate Market risk 8,757 8,757 — 3,750 — Commercial 908 908 — 6,500 — Secured by 1-4 family 1,220 1,220 — 1,228 — Consumer — — — — — Equipment leases — — — — — Total impaired loans with no allowance recorded $ 47,063 $ 70,348 $ — $ 40,720 $ — With an allowance recorded: Commercial Business loans $ 28,662 $ 31,730 $ 13,483 $ 24,184 $ — Energy loans 44,431 64,171 12,935 50,955 — Real estate Market risk 259 259 50 2,855 — Commercial — — — — — Secured by 1-4 family 232 232 51 750 — Consumer 39 39 8 71 — Equipment leases — — — — — Total impaired loans with an allowance recorded $ 73,623 $ 96,431 $ 26,527 $ 78,815 $ — Combined: Commercial Business loans $ 46,082 $ 63,000 $ 13,483 $ 43,086 $ — Energy loans 63,189 92,364 12,935 61,295 — Real estate Market risk 9,016 9,016 50 6,605 — Commercial 908 908 — 6,500 — Secured by 1-4 family 1,452 1,452 51 1,978 — Consumer 39 39 8 71 — Equipment leases — — — — — Total impaired loans $ 120,686 $ 166,779 $ 26,527 $ 119,535 $ — (in thousands) Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized December 31, 2018 With no related allowance recorded: Commercial Business loans $ 23,367 $ 55,008 $ — $ 16,426 $ 133 Energy loans 12,188 13,363 — 17,135 — Real estate Market risk — — — — — Commercial 7,388 7,388 — 3,215 — Secured by 1-4 family 1,233 1,233 — 734 — Consumer — — — — — Equipment leases — — — — — Total impaired loans with no allowance recorded $ 44,176 $ 76,992 $ — $ 37,510 $ 133 With an allowance recorded: Commercial Business loans $ 17,529 $ 17,564 $ 4,679 $ 41,307 $ — Energy loans 25,344 28,105 3,573 25,672 — Real estate Market risk — — — 49 — Commercial — — — 83 — Secured by 1-4 family 236 236 48 188 — Consumer 55 55 10 54 — Equipment leases — — — 275 — Total impaired loans with an allowance recorded $ 43,164 $ 45,960 $ 8,310 $ 67,628 $ — Combined: Commercial Business loans $ 40,896 $ 72,572 $ 4,679 $ 57,733 $ 133 Energy loans 37,532 41,468 3,573 42,807 — Real estate Market risk — — — 49 — Commercial 7,388 7,388 — 3,298 — Secured by 1-4 family 1,469 1,469 48 922 — Consumer 55 55 10 54 — Equipment leases — — — 275 — Total impaired loans $ 87,340 $ 122,952 $ 8,310 $ 105,138 $ 133 The table below provides an age analysis of our loans held for investment: (in thousands) 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days(1) Total Past Due Non-accrual Current Total September 30, 2019 Commercial Business loans $ 31,313 $ 6,039 $ 19,084 $ 56,436 $ 46,082 $ 8,728,321 $ 8,830,839 Energy 30,000 4,200 7,550 41,750 63,189 1,442,174 1,547,113 Mortgage finance loans — — — — — 7,951,432 7,951,432 Construction Market risk — 15,700 — 15,700 — 2,520,335 2,536,035 Commercial — — — — — 81,159 81,159 Secured by 1-4 family — — — — — 23,825 23,825 Real estate Market risk 3,129 14,004 2,061 19,194 9,016 2,294,067 2,322,277 Commercial — — — — 908 821,323 822,231 Secured by 1-4 family 312 — 953 1,265 1,452 366,574 369,291 Consumer 277 20 — 297 39 67,697 68,033 Equipment leases — — — — — 266,600 266,600 Total loans held for investment $ 65,031 $ 39,963 $ 29,648 $ 134,642 $ 120,686 $ 24,563,507 $ 24,818,835 (1) Loans past due 90 days and still accruing includes premium finance loans of $9.2 million . These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The receipt of the refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date.
Schedule of loans that have been restructured	The following table details the recorded investment at September 30, 2019 and 2018 of loans that have been restructured during the nine months ended September 30, 2019 and 2018 by type of modification: Extended Maturity Adjusted Payment Schedule Total (in thousands, except number of contracts) Number of Contracts Balance at Period End Number of Contracts Balance at Period End Number of Contracts Balance at Period End Nine months ended September 30, 2019 Commercial: Business loans 1 $ 1,824 — $ — 1 $ 1,824 Energy loans 1 3,941 — — 1 3,941 Total 2 $ 5,765 — $ — 2 $ 5,765 Nine months ended September 30, 2018 Commercial: Business loans — $ — 2 $ 2,582 $ 2 $ 2,582 Energy loans — $ — 5 $ 12,332 5 $ 12,332 Total — $ — 7 $ 14,914 7 $ 14,914

OREO and Valuation Allowance _2

OREO and Valuation Allowance for Losses on OREO (Tables)	9 Months Ended
	Sep. 30, 2019
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Summary of the activity related to OREO	The table below presents a summary of the activity related to OREO: Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Beginning balance $ — $ 9,526 $ 79 $ 11,742 Sales — (11,447 ) (79 ) (11,663 ) Valuation allowance for OREO — 2,000 — — Ending balance $ — $ 79 $ — $ 79

Certain Transfers of Financia_2

Certain Transfers of Financial Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Transfers and Servicing [Abstract]
Schedule of Loans Held-for-sale [Table Text Block]	The table below presents a reconciliation of the changes in loans held for sale: Nine Months Ended September 30, (in thousands) 2019 2018 Outstanding balance(1): Beginning balance $ 1,949,785 $ 1,012,580 Loans purchased and originated 7,288,823 5,012,188 Payments and loans sold (6,571,942 ) (4,366,138 ) Ending balance 2,666,666 1,658,630 Fair value adjustment: Beginning balance 19,689 (1,576 ) Increase/(decrease) to fair value (12,130 ) (5,124 ) Ending balance 7,559 (6,700 ) Loans held for sale at fair value $ 2,674,225 $ 1,651,930 (1) Includes $7.1 million and $299,000 of loans held for sale that are carried at lower of cost or market as of September 30, 2019 and December 31, 2018
Schedule of Mortgage Servicing Rights Activity [Table Text Block]	retain the right to service the loans sold through our MCA program, creating mortgage servicing rights ("MSRs") which are recorded as assets on our balance sheet. A summary of MSR activity is as follows: Nine months ended September 30, (in thousands) 2019 2018 MSRs: Balance, beginning of year $ 42,474 $ 88,150 Capitalized servicing rights 22,610 32,871 Amortization (7,599 ) (7,920 ) Sales — (26,742 ) Balance, end of period $ 57,485 $ 86,359 Valuation allowance: Balance, beginning of year $ — $ 2,823 Increase (decrease) in valuation allowance 8,360 (2,823 ) Balance, end of period $ 8,360 $ — MSRs, net $ 49,125 $ 86,359 MSRs, fair value $ 49,125 $ 98,391
Schedule of Fair Value Assumption Used to Value Mortgage Servicing Rights Retained [Table Text Block]	The following summarizes the assumptions used by management to determine the fair value of MSRs: September 30, 2019 December 31, 2018 Average discount rates 9.06 % 9.55 % Expected prepayment speeds 14.48 % 9.77 % Weighted-average life, in years 5.3 7.0
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets [Table Text Block]	A sensitivity analysis of changes in the fair value of our MSR portfolio resulting from certain key assumptions is presented in the following table: (in thousands) September 30, 2019 December 31, 2018 50 bp adverse change in prepayment speed $ (6,077 ) $ (6,028 ) 100 bp adverse change in prepayment speed (9,340 ) (11,629 )

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Leases [Abstract]
Summary of lease cost and other information, operating leases	The table below summarizes our net lease cost: (in thousands) Three months ended Nine months ended September 30, 2019 Operating lease cost $ 3,836 $ 10,973 Variable lease cost 845 2,977 Sublease income (32 ) (94 ) Net lease cost $ 4,649 $ 13,856 Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows from operating leases $ 3,592 $ 11,054 Non-cash changes in ROU assets $ 13,610 $ 97,898 Non-cash changes in lease liabilities(1) $ 13,610 $ 107,719 (1) Includes $4.2 million and $87.9 million in lease liabilities from new ROU assets obtained during the three and nine months ended September 30, 2019, respectively. The table below summarizes other information related to our operating leases: September 30, 2019 Weighted-average remaining lease term - operating leases, in years 7.3 Weighted-average discount rate - operating leases 2.75 %
Summary of maturity of remaining lease liabilities	The table below summarizes the maturity of remaining lease liabilities: (in thousands) September 30, 2019 2019 $ 3,666 2020 16,518 2021 17,035 2022 16,235 2023 16,271 2024 and thereafter 39,511 Total lease payments 109,236 Less: Interest (10,824 ) Present value of lease liabilities $ 98,412

Financial Instruments with Of_2

Financial Instruments with Off-Balance Sheet Risk (Tables)	9 Months Ended
	Sep. 30, 2019
Risks and Uncertainties [Abstract]
Schedule of financial instruments with off-balance sheet risk	The table below presents our financial instruments with off-balance sheet risk, as well as the activity in the allowance for off-balance sheet credit losses related to those financial instruments. This allowance is recorded in other liabilities on the consolidated balance sheet. Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Beginning balance of allowance for off-balance sheet credit losses $ 10,790 $ 10,458 $ 11,434 $ 9,071 Provision for off-balance sheet credit losses (1,439 ) (175 ) (2,083 ) 1,212 Ending balance of allowance for off-balance sheet credit losses $ 9,351 $ 10,283 $ 9,351 $ 10,283 (in thousands) September 30, 2019 December 31, 2018 Commitments to extend credit - period end balance $ 8,139,889 $ 8,030,198 Standby letters of credit - period end balance $ 277,832 $ 236,537

Regulatory Restrictions (Tables

Regulatory Restrictions (Tables)	9 Months Ended
	Sep. 30, 2019
Regulatory Capital Requirements [Abstract]
Schedule of compliance with Regulatory Capital Requirements	The table below summarizes our actual and required capital ratios under the Basel III Capital Rules: Actual Minimum Capital Required - Basel III Phase-In Schedule Minimum capital Required - Basel III Fully Phased-In Required to be Considered Well Capitalized (dollars in thousands) Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio September 30, 2019 CET1 Company $ 2,579,029 8.59 % N/A N/A $ 2,102,394 7.00 % N/A N/A Bank 2,598,906 8.66 % N/A N/A 2,101,222 7.00 % 1,951,135 6.50 % Total capital (to risk-weighted assets) Company 3,318,598 11.05 % N/A N/A 3,153,591 10.50 % N/A N/A Bank 3,179,785 10.59 % N/A N/A 3,151,833 10.50 % 3,001,746 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,837,070 9.45 % N/A N/A 2,552,907 8.50 % N/A N/A Bank 2,756,947 9.18 % N/A N/A 2,551,484 8.50 % 2,401,397 8.00 % Tier 1 capital (to average assets)(1) Company 2,837,070 8.63 % N/A N/A 1,314,356 4.00 % N/A N/A Bank 2,756,947 8.39 % N/A N/A 1,313,883 4.00 % 1,642,353 5.00 % December 31, 2018 CET1 Company $ 2,330,599 8.58 % $ 1,732,501 6.38 % $ 1,902,354 7.00 % N/A N/A Bank 2,340,988 8.62 % 1,731,955 6.38 % 1,901,755 7.00 % 1,765,915 6.50 % Total capital (to risk-weighted assets) Company 3,074,097 11.31 % 2,683,679 9.88 % 2,853,532 10.50 % N/A N/A Bank 2,925,872 10.77 % 2,682,833 9.88 % 2,852,632 10.50 % 2,716,793 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,589,374 9.53 % 2,140,149 7.88 % 2,310,002 8.50 % N/A N/A Bank 2,499,763 9.20 % 2,139,474 7.88 % 2,309,274 8.50 % 2,173,434 8.00 % Tier 1 capital (to average assets)(1) Company 2,589,374 9.87 % 1,049,694 4.00 % 1,049,694 4.00 % N/A N/A Bank 2,499,763 9.53 % 1,049,296 4.00 % 1,049,296 4.00 % 1,311,620 5.00 % (1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, the Federal Reserve Board and the FDIC may require the Company and the Bank, respectively, to maintain a Tier 1 capital ratio (to average assets) above the required minimum.

Stock-based Compensation (Table

Stock-based Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Compensation Related Costs [Abstract]
Schedule of stock-based compensation costs	The table below summarizes our stock-based compensation expense for the three and nine months ended September 30, 2019 and 2018 : Three months ended September 30, Nine months ended September 30, (in thousands) 2019 2018 2019 2018 Stock-settled awards: SARs $ — $ 19 $ 6 $ 112 RSUs 3,015 2,261 8,532 6,235 Restricted stock 8 12 27 36 Cash-settled performance units 1,005 2,144 4,408 9,250 Total $ 4,028 $ 4,436 $ 12,973 $ 15,633
Schedule of unrecognized compensation costs	(in thousands except period data) September 30, 2019 Unrecognized compensation expense related to unvested stock-settled awards $ 26,435 Weighted average period over which expense is expected to be recognized, in years 3.1

Fair Value Disclosures (Tables)

Fair Value Disclosures (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value	Assets and liabilities measured at fair value are as follows: Fair Value Measurements Using (in thousands) Level 1 Level 2 Level 3 September 30, 2019 Available-for-sale debt securities:(1) Residential mortgage-backed securities $ — $ 5,918 $ — Tax-exempt asset-backed securities — — 197,613 CRT securities — — 11,455 Equity securities(1)(2) 15,890 7,146 — Loans held for sale(3) — 2,657,969 9,198 Loans held for investment(4)(6) — — 56,993 Derivative assets(7) — 62,726 — Derivative liabilities(7) — 60,393 — Non-qualified deferred compensation plan liabilities(8) 16,790 — — December 31, 2018 Available-for-sale debt securities:(1) Residential mortgage-backed securities $ — $ 7,242 $ — Tax-exempt asset-backed securities — — 95,804 Equity securities(1)(2) 10,262 6,908 — Loans held for sale(3) — 1,952,760 16,415 Loans held for investment(4)(6) — — 29,885 OREO(5)(6) — — 79 Derivative assets(7) — 21,806 — Derivative liabilities(7) — 41,375 — Non-qualified deferred compensation plan liabilities(8) 10,148 — — (1) Securities are measured at fair value on a recurring basis, generally monthly, except for tax-exempt asset-backed securities and CRT securities which are measured quarterly. (2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. (3) Loans held for sale purchased through our MCA program are measured at fair value on a recurring basis, generally monthly. (4) Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral. (5) OREO is transferred from loans to OREO at fair value less selling costs. (6) Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions. (7) Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly. (8) Non-qualified deferred compensation plan liabilities represent the fair value of the obligation to the employee, which generally corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation	The following table presents a reconciliation of the level 3 fair value category measured at fair value on a recurring basis: Net Realized/Unrealized Gains (Losses) (in thousands) Balance at Beginning of Period Purchases / Additions Sales / Reductions Realized Unrealized Balance at End of Period Three months ended September 30, 2019 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 201,339 $ — $ (4,116 ) $ — $ 390 $ 197,613 CRT securities $ 10,953 $ — $ — $ — $ 502 $ 11,455 Loans held for sale(2) $ 10,930 $ — $ (2,056 ) $ 102 $ 222 $ 9,198 Three months ended September 30, 2018 Tax-exempt asset-backed securities(1) $ — $ 95,521 $ — $ — $ (2,152 ) $ 93,369 Loans held for sale(2) $ 27,929 $ 901 $ (6,948 ) $ (134 ) $ 165 $ 21,913 Nine months ended September 30, 2019 Available-for-sale debt securities:(1) Tax-exempt asset-backed securities $ 95,804 $ 92,010 $ (4,254 ) $ — $ 14,053 $ 197,613 CRT securities $ — $ 15,044 $ — $ (331 ) $ (3,258 ) $ 11,455 Loans held for sale(2) $ 16,415 $ — $ (8,466 ) $ 450 $ 799 $ 9,198 Nine months ended September 30, 2018 Tax-exempt asset-backed securities(1) $ — $ 95,521 $ — $ — $ (2,152 ) $ 93,369 Loans held for sale(2) $ — $ 38,430 $ (14,936 ) $ (66 ) $ (1,515 ) $ 21,913 (1) Unrealized gains/(losses) on available-for-sale debt securities are recorded in AOCI. Realized gains/(losses) are recorded in other non-interest income. (2) Realized and unrealized gains/(losses) on loans held for sale are recorded in gain/(loss) on sale of loans held for sale.
Summary of the carrying amounts and estimated fair values of financial instruments	A summary of the carrying amounts and estimated fair values of financial instruments is as follows: September 30, 2019 December 31, 2018 (in thousands) Carrying Amount Estimated Fair Value Carrying Estimated Financial assets: Level 1 inputs: Cash and cash equivalents $ 5,209,270 $ 5,209,270 $ 3,080,065 $ 3,080,065 Investment securities 15,890 15,890 10,262 10,262 Level 2 inputs: Investment securities 13,064 13,064 14,150 14,150 Loans held for sale 2,657,969 2,657,969 1,953,059 1,953,059 Derivative assets 62,726 62,726 21,806 21,806 Level 3 inputs: Investment securities 209,068 209,068 95,804 95,804 Loans held for sale 9,198 9,198 16,415 16,415 Loans held for investment, net 24,534,118 24,564,623 22,376,552 22,347,876 Financial liabilities: Level 2 inputs: Federal funds purchased 127,800 127,800 629,169 629,169 Customer repurchase agreements 12,167 12,167 12,005 12,005 Other borrowings 2,500,000 2,500,000 3,900,000 3,900,000 Subordinated notes 282,038 293,472 281,767 283,349 Trust preferred subordinated debentures 113,406 113,406 113,406 113,406 Derivative liabilities 60,393 60,393 41,375 41,375 Level 3 inputs: Deposits 27,413,303 27,420,277 20,606,113 20,608,494

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The notional amounts and estimated fair values of derivative positions outstanding are presented in the following table: September 30, 2019 December 31, 2018 Estimated Fair Value Estimated Fair Value (in thousands) Notional Amount Asset Derivative Liability Derivative Notional Amount Asset Derivative Liability Derivative Non-hedging derivatives: Financial institution counterparties: Commercial loan/lease interest rate swaps $ 1,540,248 $ 94 $ 58,347 $ 1,579,328 $ 7,978 $ 16,719 Commercial loan/lease interest rate caps 627,149 43 — 606,950 1,109 4 Foreign currency forward contracts 2,954 37 6 39,737 2,263 59 Customer counterparties: Commercial loan/lease interest rate swaps 1,540,248 58,347 94 1,579,328 16,719 7,978 Commercial loan/lease interest rate caps 627,149 — 43 606,950 4 1,109 Foreign currency forward contracts 2,954 6 37 39,737 59 2,263 Economic hedging interest rate derivatives: Loan purchase commitments 580,472 3,590 150 167,984 1,442 6 Forward sale commitments 2,747,284 703 1,810 1,928,527 — 21,005 Gross derivatives 62,820 60,487 29,574 49,143 Offsetting derivative assets/liabilities (94 ) (94 ) (7,768 ) (7,768 ) Net derivatives included in the consolidated balance sheets $ 62,726 $ 60,393 $ 21,806 $ 41,375
Schedule Of Weighted Average Interest Rate Received And Paid	The weighted-average received and paid interest rates for interest rate swaps outstanding were as follows: September 30, 2019 Weighted-Average Interest Rate December 31, 2018 Weighted-Average Interest Rate Received Paid Received Paid Non-hedging interest rate swaps 4.03 % 3.56 % 4.24 % 4.20 %

Operations and Summary of Sig_3

Operations and Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Property, Plant and Equipment [Line Items]
Operating lease ROU assets	$ 84,300
Operating lease liabilities	$ 98,412
Accounting Standards Update 2016-02
Property, Plant and Equipment [Line Items]
Operating lease ROU assets		$ 64,000
Operating lease liabilities		$ 74,000

Earnings Per Share (Details)

Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net income	$ 88,141	$ 85,552	$ 248,949	$ 228,933
Preferred stock dividends	2,438	2,438	7,313	7,313
Net income available to common stockholders	$ 85,703	$ 83,114	$ 241,636	$ 221,620
Denominator:
Basic earnings per share - weighted average shares	50,305,844	50,163,433	50,273,485	49,853,515
Effect of employee stock-based awards	110,558	207,391	119,277	240,376
Effect of warrants to purchase common stock	0	10,525	0	115,537
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,416,402	50,381,349	50,392,762	50,209,428
Basic earnings per common share	$ 1.70	$ 1.66	$ 4.81	$ 4.45
Diluted earnings per common share	$ 1.70	$ 1.65	$ 4.80	$ 4.41
Stock options excluded from computation of EPS	107,615	4,000

Investment Securities (Details)

Investment Securities (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		$ 203,580		$ 102,392
Gross Unrealized Gains		14,664		654
Gross Unrealized Losses		(3,258)		0
Estimated Fair Value		214,986		103,046
Payments to acquire AFS securities, debt		111,131	$ 99,295
Residential mortgage-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		5,594		6,874
Gross Unrealized Gains		324		368
Gross Unrealized Losses		0		0
Estimated Fair Value		5,918		7,242
Tax-exempt asset-backed securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		183,273		95,518
Gross Unrealized Gains		14,340		286
Gross Unrealized Losses		0		0
Estimated Fair Value		197,613		$ 95,804
Payments to acquire AFS securities, debt	$ 92,000
Credit risk transfer securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost		14,713
Gross Unrealized Gains		0
Gross Unrealized Losses		(3,258)
Estimated Fair Value		$ 11,455
Payments to acquire AFS securities, debt	$ 15,000
Percentage of share of first losses	50.00%
Percentage of potential recovery on notes	100.00%

Investment Securities (Details

Investment Securities (Details 1) - USD ($)	3 Months Ended
	Mar. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Amortized cost
Amortized Cost		$ 203,580,000	$ 102,392,000
Estimated fair value
Total		214,986,000	103,046,000
Investment securities		214,986,000	103,046,000
Weighted average yield
Debt Securities, Available-for-sale, Amortized Cost		203,580,000	102,392,000
Available-for-sale Securities, Other Disclosure Items
Federal tax rate (percent)	21.00%
Customer repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits		3,900,000	4,800,000
Residential mortgage-backed securities
Amortized cost
Less Than One Year		0	3,000
After One Through Five Years		1,135,000	1,573,000
After Five Through Ten Years		0	0
After Ten Years		4,459,000	5,298,000
Amortized Cost		5,594,000	6,874,000
Estimated fair value
Less Than One Year		0	4,000
After One Through Five Years		1,232,000	1,668,000
After Five Through Ten Years		0	0
After Ten Years		4,686,000	5,570,000
Investment securities		$ 5,918,000	$ 7,242,000
Weighted average yield
Less Than One Year		0.00%	6.50%
After One Through Five Years		5.54%	5.54%
After Five Through Ten Years		0.00%	0.00%
After Ten Years		4.68%	4.53%
Total		4.86%	4.76%
Debt Securities, Available-for-sale, Amortized Cost		$ 5,594,000	$ 6,874,000
Tax-exempt asset-backed securities
Amortized cost
Less Than One Year		0	0
After One Through Five Years		0	0
After Five Through Ten Years		0	0
After Ten Years		183,273,000	95,518,000
Amortized Cost		183,273,000	95,518,000
Estimated fair value
Less Than One Year		0	0
After One Through Five Years		0	0
After Five Through Ten Years		0	0
After Ten Years		197,613,000	95,804,000
Investment securities		$ 197,613,000	$ 95,804,000
Weighted average yield
Less Than One Year		0.00%	0.00%
After One Through Five Years		0.00%	0.00%
After Five Through Ten Years		0.00%	0.00%
After Ten Years		4.20%	4.25%
Total		4.20%	4.25%
Debt Securities, Available-for-sale, Amortized Cost		$ 183,273,000	$ 95,518,000
Credit risk transfer securities
Amortized cost
Less Than One Year		0
After One Through Five Years		0
After Five Through Ten Years		0
After Ten Years		14,713,000
Amortized Cost		14,713,000
Estimated fair value
Less Than One Year		0
After One Through Five Years		0
After Five Through Ten Years		0
After Ten Years		11,455,000
Investment securities		$ 11,455,000
Weighted average yield
Less Than One Year		0.00%
After One Through Five Years		0.00%
After Five Through Ten Years		0.00%
After Ten Years		2.15%
Total		2.15%
Debt Securities, Available-for-sale, Amortized Cost		$ 14,713,000
Less Than 12 Months, Fair Value		11,455,000
Less Than 12 Months, Unrealized Loss		(3,258,000)
12 Months or Longer, Fair Value		0
12 Months or Longer, Unrealized Loss		0
Total, Fair Value		11,455,000
Total, Unrealized Loss		(3,258,000)
Available-for-sale Securities, Other Disclosure Items
Other-than-temporary credit-related impairment	$ 331,000
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale debt securities pledged to secure certain customer repurchase agreements and deposits		$ 1,400,000	$ 1,700,000

Investment Securities (Detail_2

Investment Securities (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Debt Securities, Available-for-sale [Abstract]
Estimated fair value	$ 23,000		$ 23,000		$ 17,200
Net gains/(losses) recognized during the period	37	$ 253	1,876	$ 149
Less: Realized net gains/(losses) recognized during the period on equity securities sold	111	18	87	180
Unrealized net gains/(losses) recognized during the period on equity securities still held	$ (74)	$ 235	$ 1,789	$ (31)

Loans Held for Investment and_3

Loans Held for Investment and Allowance for Loan Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Participating Mortgage Loans, Mortgage Obligations, Amount	$ 734,700	$ 193,000
Loans and Leases Receivable, Net Reported Amount
Commercial	10,377,952	10,373,288
Mortgage finance(1)	7,951,432	5,877,524
Construction	2,641,019	2,120,966
Real estate	3,513,799	3,929,117
Consumer	68,033	63,438
Equipment leases	266,600	312,191
Gross loans held for investment	24,818,835	22,676,524	$ 22,153,980
Deferred income (net of direct origination costs)	(94,579)	(108,450)
Allowance for loan losses	(190,138)	(191,522)	$ (190,306)	$ (184,655)
Loans held for investment, net	$ 24,534,118	$ 22,376,552

Loans Held for Investment and_4

Loans Held for Investment and Allowance for Loan Losses (Details 1) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]
Average impaired loans outstanding		$ 119,535,000	$ 105,000,000	$ 105,138,000
Interest income recognized on non-accrual loans	$ 0	0		133,000
Nonaccrual loans that met the criteria for restructured	$ 15,500,000	$ 15,500,000		$ 20,000,000

Loans Held for Investment and_5

Loans Held for Investment and Allowance for Loan Losses (Details 2) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Recorded Investment [Line Items]
Commercial	$ 10,377,952	$ 10,373,288
Mortgage finance(1)	7,951,432	5,877,524
Construction	2,641,019	2,120,966
Real estate	3,513,799	3,929,117
Consumer	68,033	63,438
Equipment leases	266,600	312,191
Total	24,818,835	22,676,524	$ 22,153,980
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial	9,986,993	10,034,597
Mortgage finance(1)	7,951,432	5,877,524
Construction	2,605,995	2,099,955
Real estate	3,404,146	3,850,811
Consumer	67,844	61,815
Equipment leases	266,101	309,775
Total	24,282,511	22,234,477
Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	198,186	120,531
Mortgage finance(1)	0	0
Construction	19,324	21,011
Real estate	73,927	47,644
Consumer	150	0
Equipment leases	245	2,223
Total	291,832	191,409
Substandard-accruing
Financing Receivable, Recorded Investment [Line Items]
Commercial	83,502	140,297
Mortgage finance(1)	0	0
Construction	15,700	0
Real estate	24,350	28,205
Consumer	0	1,568
Equipment leases	254	193
Total	123,806	170,263
Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Commercial	109,271	77,863
Mortgage finance(1)	0	0
Construction	0	0
Real estate	11,376	2,457
Consumer	39	55
Equipment leases	0	0
Total	$ 120,686	$ 80,375

Loans Held for Investment and_6

Loans Held for Investment and Allowance for Loan Losses (Details 3) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 191,522	$ 184,655
Provision for loan losses	60,083	50,788
Charge-offs	62,874	46,359
Recoveries	1,407	1,222
Net charge-offs (recoveries)	61,467	45,137
Ending balance	190,138	190,306
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	26,527	30,935
Loans collectively evaluated for impairment	163,611	159,371
Period end loans allocated to:
Loans individually evaluated for impairment	120,686	114,639
Loans collectively evaluated for impairment	24,698,149	22,039,341
Gross loans held for investment	24,818,835	22,153,980	$ 22,676,524
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	129,442	118,806
Provision for loan losses	74,462	55,808
Charge-offs	62,678	45,273
Recoveries	1,337	1,069
Net charge-offs (recoveries)	61,341	44,204
Ending balance	142,563	130,410
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	26,418	30,855
Loans collectively evaluated for impairment	116,145	99,555
Period end loans allocated to:
Loans individually evaluated for impairment	109,271	105,522
Loans collectively evaluated for impairment	10,268,681	10,011,423
Gross loans held for investment	10,377,952	10,116,945
Mortgage Finance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0
Provision for loan losses	1,966	0
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	1,966	0
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	1,966	0
Period end loans allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	7,951,432	5,477,787
Gross loans held for investment	7,951,432	5,477,787
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	19,242	19,273
Provision for loan losses	712	331
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	19,954	19,604
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	19,954	19,604
Period end loans allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	2,641,019	2,263,463
Gross loans held for investment	2,641,019	2,263,463
Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	33,353	34,287
Provision for loan losses	(7,916)	(1,635)
Charge-offs	177	0
Recoveries	0	43
Net charge-offs (recoveries)	177	(43)
Ending balance	25,260	32,695
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	101	70
Loans collectively evaluated for impairment	25,159	32,625
Period end loans allocated to:
Loans individually evaluated for impairment	11,376	9,057
Loans collectively evaluated for impairment	3,502,423	3,915,625
Gross loans held for investment	3,513,799	3,924,682
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	425	357
Provision for loan losses	(419)	757
Charge-offs	0	767
Recoveries	60	78
Net charge-offs (recoveries)	(60)	689
Ending balance	66	425
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	8	10
Loans collectively evaluated for impairment	58	415
Period end loans allocated to:
Loans individually evaluated for impairment	39	60
Loans collectively evaluated for impairment	67,994	51,632
Gross loans held for investment	68,033	51,692
Equipment Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,829	3,542
Provision for loan losses	(1,491)	(1,425)
Charge-offs	19	319
Recoveries	10	32
Net charge-offs (recoveries)	9	287
Ending balance	329	1,830
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	329	1,830
Period end loans allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	266,600	319,411
Gross loans held for investment	266,600	319,411
Additional Qualitative Reserve
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	7,231	8,390
Provision for loan losses	(7,231)	(3,048)
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	0	5,342
Period end allowance for loan losses allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	0	5,342
Period end loans allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	0	0
Gross loans held for investment	$ 0	$ 0

Loans Held for Investment and_7

Loans Held for Investment and Allowance for Loan Losses (Details 6) - USD ($)	3 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	$ 47,063,000	$ 47,063,000		$ 44,176,000
With An Allowanced Recorded, Recorded Investment	73,623,000	73,623,000		43,164,000
Combined, Recorded Investment	120,686,000	120,686,000		87,340,000
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	70,348,000	70,348,000		76,992,000
With An Allowanced Recorded, Unpaid Principal Balance	96,431,000	96,431,000		45,960,000
Combined, Unpaid Principal Balance	166,779,000	166,779,000		122,952,000
Related Allowance	26,527,000	26,527,000		8,310,000
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		40,720,000		37,510,000
With An Allowanced Recorded, Average Recorded Investment		78,815,000		67,628,000
Combined, Average Recorded Investment		119,535,000	$ 105,000,000	105,138,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		133,000
With An Allowanced Recorded, Interest Income Recognized		0		0
Interest income recognized on non-accrual loans	0	0		133,000
Commercial | Business loans
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	17,420,000	17,420,000		23,367,000
With An Allowanced Recorded, Recorded Investment	28,662,000	28,662,000		17,529,000
Combined, Recorded Investment	46,082,000	46,082,000		40,896,000
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	31,270,000	31,270,000		55,008,000
With An Allowanced Recorded, Unpaid Principal Balance	31,730,000	31,730,000		17,564,000
Combined, Unpaid Principal Balance	63,000,000	63,000,000		72,572,000
Related Allowance	13,483,000	13,483,000		4,679,000
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		18,902,000		16,426,000
With An Allowanced Recorded, Average Recorded Investment		24,184,000		41,307,000
Combined, Average Recorded Investment		43,086,000		57,733,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		133,000
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		0		133,000
Commercial | Energy loans
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	18,758,000	18,758,000		12,188,000
With An Allowanced Recorded, Recorded Investment	44,431,000	44,431,000		25,344,000
Combined, Recorded Investment	63,189,000	63,189,000		37,532,000
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	28,193,000	28,193,000		13,363,000
With An Allowanced Recorded, Unpaid Principal Balance	64,171,000	64,171,000		28,105,000
Combined, Unpaid Principal Balance	92,364,000	92,364,000		41,468,000
Related Allowance	12,935,000	12,935,000		3,573,000
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		10,340,000		17,135,000
With An Allowanced Recorded, Average Recorded Investment		50,955,000		25,672,000
Combined, Average Recorded Investment		61,295,000		42,807,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		0
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		0		0
Real estate | Market risk
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	8,757,000	8,757,000		0
With An Allowanced Recorded, Recorded Investment	259,000	259,000		0
Combined, Recorded Investment	9,016,000	9,016,000		0
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	8,757,000	8,757,000		0
With An Allowanced Recorded, Unpaid Principal Balance	259,000	259,000		0
Combined, Unpaid Principal Balance	9,016,000	9,016,000		0
Related Allowance	50,000	50,000		0
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		3,750,000		0
With An Allowanced Recorded, Average Recorded Investment		2,855,000		49,000
Combined, Average Recorded Investment		6,605,000		49,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		0
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		0		0
Real estate | Commercial
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	908,000	908,000		7,388,000
With An Allowanced Recorded, Recorded Investment	0	0		0
Combined, Recorded Investment	908,000	908,000		7,388,000
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	908,000	908,000		7,388,000
With An Allowanced Recorded, Unpaid Principal Balance	0	0		0
Combined, Unpaid Principal Balance	908,000	908,000		7,388,000
Related Allowance	0	0		0
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		6,500,000		3,215,000
With An Allowanced Recorded, Average Recorded Investment		0		83,000
Combined, Average Recorded Investment		6,500,000		3,298,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		0
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		0		0
Real estate | Secured by 1-4 family
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	1,220,000	1,220,000		1,233,000
With An Allowanced Recorded, Recorded Investment	232,000	232,000		236,000
Combined, Recorded Investment	1,452,000	1,452,000		1,469,000
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	1,220,000	1,220,000		1,233,000
With An Allowanced Recorded, Unpaid Principal Balance	232,000	232,000		236,000
Combined, Unpaid Principal Balance	1,452,000	1,452,000		1,469,000
Related Allowance	51,000	51,000		48,000
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		1,228,000		734,000
With An Allowanced Recorded, Average Recorded Investment		750,000		188,000
Combined, Average Recorded Investment		1,978,000		922,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		0
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		0		0
Consumer
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	0		0
With An Allowanced Recorded, Recorded Investment	39,000	39,000		55,000
Combined, Recorded Investment	39,000	39,000		55,000
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	0		0
With An Allowanced Recorded, Unpaid Principal Balance	39,000	39,000		55,000
Combined, Unpaid Principal Balance	39,000	39,000		55,000
Related Allowance	8,000	8,000		10,000
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		0		0
With An Allowanced Recorded, Average Recorded Investment		71,000		54,000
Combined, Average Recorded Investment		71,000		54,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		0
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		0		0
Equipment leases
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	0		0
With An Allowanced Recorded, Recorded Investment	0	0		0
Combined, Recorded Investment	0	0		0
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	0		0
With An Allowanced Recorded, Unpaid Principal Balance	0	0		0
Combined, Unpaid Principal Balance	0	0		0
Related Allowance	$ 0	0		0
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment		0		0
With An Allowanced Recorded, Average Recorded Investment		0		275,000
Combined, Average Recorded Investment		0		275,000
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized		0		0
With An Allowanced Recorded, Interest Income Recognized		0		0
Combined, Interest Income Recognized		$ 0		$ 0

Loans Held for Investment and_8

Loans Held for Investment and Allowance for Loan Losses (Details 7) $ in Thousands	Sep. 30, 2019USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 134,642
Non-accrual	120,686
Current	24,563,507
Total	24,818,835
Premium finance loans past due and still accruing	9,200
Commercial | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	56,436
Non-accrual	46,082
Current	8,728,321
Total	8,830,839
Commercial | Energy loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	41,750
Non-accrual	63,189
Current	1,442,174
Total	1,547,113
Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	7,951,432
Total	7,951,432
Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,700
Non-accrual	0
Current	2,520,335
Total	2,536,035
Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	81,159
Total	81,159
Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	23,825
Total	23,825
Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,194
Non-accrual	9,016
Current	2,294,067
Total	2,322,277
Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Non-accrual	908
Current	821,323
Total	822,231
Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,265
Non-accrual	1,452
Current	366,574
Total	369,291
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	297
Non-accrual	39
Current	67,697
Total	68,033
Equipment leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Non-accrual	0
Current	266,600
Total	266,600
30 to 59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	65,031
30 to 59 Days Past Due | Commercial | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	31,313
30 to 59 Days Past Due | Commercial | Energy loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	30,000
30 to 59 Days Past Due | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
30 to 59 Days Past Due | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
30 to 59 Days Past Due | Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
30 to 59 Days Past Due | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
30 to 59 Days Past Due | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	3,129
30 to 59 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
30 to 59 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	312
30 to 59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	277
30 to 59 Days Past Due | Equipment leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
60 to 89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	39,963
60 to 89 Days Past Due | Commercial | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	6,039
60 to 89 Days Past Due | Commercial | Energy loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,200
60 to 89 Days Past Due | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
60 to 89 Days Past Due | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	15,700
60 to 89 Days Past Due | Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
60 to 89 Days Past Due | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
60 to 89 Days Past Due | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	14,004
60 to 89 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
60 to 89 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
60 to 89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	20
60 to 89 Days Past Due | Equipment leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	29,648
Greater Than 90 Days | Commercial | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	19,084
Greater Than 90 Days | Commercial | Energy loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	7,550
Greater Than 90 Days | Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days | Construction | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,061
Greater Than 90 Days | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	953
Greater Than 90 Days | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0
Greater Than 90 Days | Equipment leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 0

Loans Held for Investment and_9

Loans Held for Investment and Allowance for Loan Losses (Details 8) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)loan	Sep. 30, 2018USD ($)loan	Dec. 31, 2018USD ($)
Financing Receivable, Modifications [Line Items]
Nonaccrual loans that met the criteria for restructured	$ 15,500		$ 20,000
Number of Contracts | loan	2	7
Loans modified as restructured loans	$ 5,765	$ 14,914
Extended maturity
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	2	0
Loans modified as restructured loans	$ 5,765	$ 0
Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	0	7
Loans modified as restructured loans	$ 0	$ 14,914
Commercial | Business loans
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	1	2
Loans modified as restructured loans	$ 1,824	$ 2,582
Commercial | Business loans | Extended maturity
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	1	0
Loans modified as restructured loans	$ 1,824	$ 0
Commercial | Business loans | Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	0	2
Loans modified as restructured loans	$ 0	$ 2,582
Commercial | Energy loans
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	1	5
Loans modified as restructured loans	$ 3,941	$ 12,332
Commercial | Energy loans | Extended maturity
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	1	0
Loans modified as restructured loans	$ 3,941	$ 0
Commercial | Energy loans | Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Number of Contracts | loan	0	5
Loans modified as restructured loans	$ 0	$ 12,332

OREO and Valuation Allowance _3

OREO and Valuation Allowance for Losses on OREO (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Other Real Estate [Roll Forward]
Beginning balance	$ 0	$ 9,526	$ 79	$ 11,742
Sales	0	(11,447)	(79)	(11,663)
Valuation allowance for OREO	0	2,000	0	0
Ending balance	$ 0	$ 79	$ 0	$ 79

Certain Transfers of Financia_3

Certain Transfers of Financial Assets Certain Transfers of Financial Assets (Details) - USD ($) $ in Thousands	6 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Outstanding balance(1):
Beginning balance	$ 1,949,785	$ 1,012,580	$ 1,949,785	$ 1,012,580
Loans purchased and originated			7,288,823	5,012,188
Payments and loans sold			(6,571,942)	(4,366,138)
Ending balance			2,666,666	1,658,630
Fair value adjustment:
Fair value over (under) outstanding balance	19,689	(1,576)	19,689	(1,576)
Increase/(decrease) to fair value	(12,130)	(5,124)
Fair value over (under) outstanding balance			7,559	(6,700)
Loans held for sale			2,674,225	1,651,930	$ 1,969,474
Small Business Administration Loans [Member]
Fair value adjustment:
Fair value over (under) outstanding balance	$ 299	$ 3,300	299	$ 3,300
Fair value over (under) outstanding balance			$ 7,100

Certain Transfers of Financia_4

Certain Transfers of Financial Assets (Details 1) - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	$ 2,666,666,000	$ 1,658,630,000	$ 1,949,785,000	$ 1,012,580,000
Total Past Due	134,642,000
Estimated exposure related to servicing assets	5,400,000		1,600,000
Principal amount outstanding of loans in servicing portfolio	5,600,000,000		3,900,000,000
Escrow deposits related to servicing portfolio	75,200,000		37,900,000
Losses due to repurchase indemnification and make-whole obligations	4,500,000	$ 187,000
Greater Than 90 Days
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	9,200,000		16,800,000
Total Past Due	29,648,000
Mortgage servicing rights
Loans and Leases Receivable Disclosure [Line Items]
Impairment charges	8,400,000
Government guarantees | Greater Than 90 Days
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	7,300,000		$ 16,000,000
Government guarantees | Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Greater Than 90 Days
Loans and Leases Receivable Disclosure [Line Items]
Total Past Due	1,900,000
Non-accrual
Loans and Leases Receivable Disclosure [Line Items]
Loans held for sale	$ 0

Certain Transfers of Financia_5

Certain Transfers of Financial Assets (Details 2) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Valuation Allowance for Impairment of Recognized Servicing Assets, Sales and Disposals [Abstract]
Valuation allowance, beginning balance	$ 1,600
Valuation allowance, ending balance	5,400
Mortgage Servicing Rights
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Balance, beginning of year	42,474	$ 88,150
Capitalized servicing rights	22,610	32,871
Amortization	(7,599)	(7,920)
Sales	0	(26,742)
Balance, end of period	57,485	86,359
Valuation Allowance for Impairment of Recognized Servicing Assets, Sales and Disposals [Abstract]
Valuation allowance, beginning balance	0	2,823
Increase (decrease) in valuation allowance	8,360	(2,823)
Valuation allowance, ending balance	8,360	0
MSRs, net	49,125	86,359
Fair value	$ 49,125	$ 98,391

Certain Transfers of Financia_6

Certain Transfers of Financial Assets (Details 3) - Mortgage Servicing Rights	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities [Line Items]
Average discount rates (percent)	9.06%	9.55%
Expected prepayment speeds (percent)	14.48%	9.77%
Weighted-average life, in years	5 years 3 months 18 days	7 years

Certain Transfers of Financia_7

Certain Transfers of Financial Assets Certain Transfers of Financial Assets (Details 4) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Transfers and Servicing [Abstract]
50 bp adverse change in prepayment speed	$ (6,077)	$ (6,028)
100 bp adverse change in prepayment speed	$ (9,340)	$ (11,629)

Leases - Narrative (Details)

Leases - Narrative (Details) $ in Thousands	Sep. 30, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease ROU assets	$ 84,300
Operating lease liabilities	$ 98,412
Minimum
Lessee, Lease, Description [Line Items]
Lease terms	1 year
Extension options	5 years
Maximum
Lessee, Lease, Description [Line Items]
Lease terms	13 years
Extension options	10 years

Leases - Net lease cost (Detail

Leases - Net lease cost (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 3,836	$ 10,973
Variable lease cost	845	2,977
Sublease income	(32)	(94)
Net lease cost	4,649	13,856
Operating cash flows from operating leases	3,592	11,054
Non-cash changes in ROU assets	13,610	97,898
Non-cash changes in lease liabilities(1)	13,610	107,719
Right-of-use asset obtained in exchange for finance lease liability	$ 4,200	$ 87,900

Leases - Other information (Det

Leases - Other information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Leases [Abstract]
Operating cash flows from operating leases	$ 3,592	$ 11,054
Weighted-average remaining lease term - operating leases, in years	7 years 3 months 18 days	7 years 3 months 18 days
Weighted-average discount rate - operating leases	2.75%	2.75%

Leases - Maturity of remaining

Leases - Maturity of remaining lease liabilities (Details) $ in Thousands	Sep. 30, 2019USD ($)
Leases [Abstract]
2019	$ 3,666
2020	16,518
2021	17,035
2022	16,235
2023	16,271
2024 and thereafter	39,511
Total lease payments	109,236
Less: Interest	(10,824)
Present value of lease liabilities	$ 98,412

Financial Instruments with Of_3

Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	$ 8,139,889	$ 8,030,198
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	$ 277,832	$ 236,537

Regulatory Restrictions (Detail

Regulatory Restrictions (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Assets	$ 33,526,437		$ 28,257,767	$ 15,000,000
Mortgage finance(1)	7,951,432		5,877,524
Mortgage Finance, Average Balance	8,100,000
Common Equity Tier 1 [Abstract]
CET1, actual amount	2,579,029		2,330,599
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	3,318,598		3,074,097
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	2,837,070		2,589,374
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	$ 2,837,070		$ 2,589,374
Risk Based Ratios [Abstract]
CET1, actual ratio	8.59%		8.58%
Total capital (to risk weighted assets), actual ratio	11.05%		11.31%
Tier 1 capital (to risk-weighted assets), actual ratio	9.45%		9.53%
Tier 1 capital (to average assets), actual ratio	8.63%		9.87%
Bank
Common Equity Tier 1 [Abstract]
CET1, actual amount	$ 2,598,906		$ 2,340,988
CET1 to be well capitalized under prompt corrective action provisions, amount	1,951,135		1,765,915
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	3,179,785		2,925,872
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	3,001,746		2,716,793
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	2,756,947		2,499,763
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	2,401,397		2,173,434
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	2,756,947		2,499,763
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, amount	$ 1,642,353		$ 1,311,620
Risk Based Ratios [Abstract]
CET1, actual ratio	8.66%		8.62%
CET1 to be well capitalized under prompt corrective action provisions, ratio	6.50%		6.50%
Total capital (to risk weighted assets), actual ratio	10.59%		10.77%
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	10.00%		10.00%
Tier 1 capital (to risk-weighted assets), actual ratio	9.18%		9.20%
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	8.00%		8.00%
Tier 1 capital (to average assets), actual ratio	8.39%		9.53%
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio	5.00%		5.00%
Basel III, Phase-In Schedule
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount			$ 1,732,501
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount			2,683,679
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount			2,140,149
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount			$ 1,049,694
Risk Based Ratios [Abstract]
CET1 for capital adequacy purposes, ratio			6.38%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio			9.88%
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio			7.88%
Tier 1 capital (to average assets) for capital adequacy purposes, ratio			4.00%
Basel III, Phase-In Schedule | Bank
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount			$ 1,731,955
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount			2,682,833
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount			2,139,474
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount			$ 1,049,296
Risk Based Ratios [Abstract]
CET1 for capital adequacy purposes, ratio			6.38%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio			9.88%
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio			7.88%
Tier 1 capital (to average assets) for capital adequacy purposes, ratio			4.00%
Basel III, Phased-In
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount	$ 2,102,394		$ 1,902,354
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	3,153,591		2,853,532
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,552,907		2,310,002
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,314,356		$ 1,049,694
Risk Based Ratios [Abstract]
CET1 for capital adequacy purposes, ratio	7.00%		7.00%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio	10.50%		10.50%
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio		1.875%
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio	8.50%		8.50%
Tier 1 capital (to average assets) for capital adequacy purposes, ratio	4.00%		4.00%
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio		2.50%
Basel III, Phased-In | Bank
Common Equity Tier 1 [Abstract]
CET1 for capital adequacy purposes, amount	$ 2,101,222		$ 1,901,755
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets) for capital adequacy purposes, amount	3,151,833		2,852,632
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	2,551,484		2,309,274
Tier 1 capital (to average assets):
Tier 1 capital (to average assets) for capital adequacy purposes, amount	$ 1,313,883		$ 1,049,296
Risk Based Ratios [Abstract]
CET1 for capital adequacy purposes, ratio	7.00%		7.00%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio	10.50%		10.50%
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio	8.50%		8.50%
Tier 1 capital (to average assets) for capital adequacy purposes, ratio	4.00%		4.00%

Stock-based Compensation (Detai

Stock-based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 4,028	$ 4,436	$ 12,973	$ 15,633
Unrecognized compensation expense related to unvested stock-settled awards	26,435		$ 26,435
Weighted average period over which unrecognized compensation expense is expected to be recognized (in years)			3 years 1 month 6 days
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	0	19	$ 6	112
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	3,015	2,261	8,532	6,235
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	8	12	27	36
Cash-settled performance units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 1,005	$ 2,144	$ 4,408	$ 9,250
Long-Term Incentive Plan 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan	2,550,000		2,550,000

Fair Value Disclosures (Details

Fair Value Disclosures (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	$ 214,986		$ 103,046
Investment securities	214,986		103,046
Loans held for sale	2,667,200		1,969,200
OREO	0	$ 0	79	$ 79	$ 9,526	$ 11,742
Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	197,613		95,804
Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	11,455
Fair value measurements, recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	0		0
Derivative assets	0		0
Derivative liabilities	0		0
Non-qualified deferred compensation plan liabilities	16,790		10,148
Fair value measurements, recurring basis | Level 1 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0		0
Fair value measurements, recurring basis | Level 1 | Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0		0
Fair value measurements, recurring basis | Level 1 | Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0
Fair value measurements, recurring basis | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	15,890		10,262
Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	2,657,969		1,952,760
Derivative liabilities			41,375
Non-qualified deferred compensation plan liabilities	0		0
Fair value measurements, recurring basis | Level 2 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	5,918		7,242
Fair value measurements, recurring basis | Level 2 | Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0		0
Fair value measurements, recurring basis | Level 2 | Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0
Fair value measurements, recurring basis | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	7,146		6,908
Fair value measurements, recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	9,198		16,415
Derivative assets	0		0
Derivative liabilities	0		0
Non-qualified deferred compensation plan liabilities	0		0
Fair value measurements, recurring basis | Level 3 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0		0
Fair value measurements, recurring basis | Level 3 | Tax-exempt asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	197,613		95,804
Fair value measurements, recurring basis | Level 3 | Credit risk transfer securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	11,455
Fair value measurements, recurring basis | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment securities	0		0
Fair value measurements, nonrecurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0		0
OREO			0
Fair value measurements, nonrecurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0		0
OREO			0
Fair value measurements, nonrecurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	56,993		29,885
OREO			79
Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets			21,806
Derivative liabilities			41,375
Not Designated as Hedging Instrument [Member] | Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	62,726		$ 21,806
Derivative liabilities	$ 60,393

Fair Value Disclosures (Detai_2

Fair Value Disclosures (Details 1) - Tax-exempt asset-backed securities - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at Beginning of Period	$ 0	$ 0
Purchases / Additions	95,521	95,521
Sales / Reductions	0	0
Realized	0	0
Unrealized	(2,152)	(2,152)
Balance at End of Period	$ 93,369	$ 93,369

Fair Value Disclosures (Detai_3

Fair Value Disclosures (Details 2) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019USD ($)	Dec. 31, 2018USD ($)
Impaired loans
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset measured on nonrecurring basis, carrying value	$ 72,600	$ 32,200
Asset measured on nonrecurring basis, specific valuation allowance	15,600	2,300
Asset measured on nonrecurring basis, reported fair value	$ 57,000	29,900
OREO
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset measured on nonrecurring basis, carrying value		$ 79
Measurement Input, Discount Rate
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Loans Held-for-sale, Measurement Input	0.953	0.929
Measurement Input, Discount Rate | Tax-exempt asset-backed securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset-Backed Securities, Measurement Input	0.0301	0.0421
Asset-Backed Securities, Term	7 years 3 months 18 days	9 years 2 months 12 days
Measurement Input, Discount Rate | Credit risk transfer securities
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset-Backed Securities, Measurement Input	0.0475
Asset-Backed Securities, Term	9 years 6 months

Fair Value Disclosures (Detai_4

Fair Value Disclosures (Details 3) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	$ 214,986	$ 103,046
Loans held for sale	2,667,200	1,969,200
Subordinated notes	282,038	281,767
Level 1 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	15,890	10,262
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	5,209,270	3,080,065
Investment securities	15,890	10,262
Level 2 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	13,064	14,150
Loans held for sale	2,657,969	1,953,059
Derivative assets		21,806
Federal funds purchased	127,800	629,169
Customer repurchase agreements	12,167	12,005
Other borrowings	2,500,000	3,900,000
Subordinated notes	282,038	281,767
Derivative liabilities		41,375
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	13,064	14,150
Loans held for sale	2,657,969	1,953,059
Derivative assets	62,726	21,806
Federal funds purchased	127,800	629,169
Customer repurchase agreements	12,167	12,005
Other borrowings	2,500,000	3,900,000
Subordinated notes	293,472	283,349
Derivative liabilities	60,393	41,375
Level 3 | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	209,068	95,804
Loans held for sale	9,198	16,415
Loans held for investment, net	24,534,118	22,376,552
Deposits	27,413,303	20,606,113
Trust preferred subordinated debentures	113,406	113,406
Level 3 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investment securities	209,068	95,804
Loans held for sale	9,198	16,415
Loans held for investment, net	24,564,623	22,347,876
Deposits	27,420,277	20,608,494
Trust preferred subordinated debentures	$ 113,406	$ 113,406

Derivative Financial Instrume_3

Derivative Financial Instruments (Details 1) - Non-hedging - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Derivative [Line Items]
Estimated fair value, asset derivative	$ 62,820	$ 29,574
Estimated fair value, liability derivative	60,487	49,143
Offsetting derivative liabilities	(94)	(7,768)
Offsetting derivative assets	(94)	(7,768)
Net asset derivatives included in the consolidated balance sheets		21,806
Net liability derivatives included in the consolidated balance sheets		41,375
Interest rate contract | Loan purchase commitments
Derivative [Line Items]
Notional amount	580,472	167,984
Estimated fair value, asset derivative	3,590	1,442
Estimated fair value, liability derivative	150	6
Interest rate contract | Loan purchase commitments
Derivative [Line Items]
Notional amount	2,747,284	1,928,527
Estimated fair value, asset derivative	703	0
Estimated fair value, liability derivative	1,810	21,005
Financial institution counterparties | Commercial loan/lease | Interest rate swap
Derivative [Line Items]
Notional amount	1,540,248	1,579,328
Estimated fair value, asset derivative	94	7,978
Estimated fair value, liability derivative	58,347	16,719
Financial institution counterparties | Commercial loan/lease | Interest rate cap
Derivative [Line Items]
Notional amount	627,149	606,950
Estimated fair value, asset derivative	43	1,109
Estimated fair value, liability derivative	0	4
Financial institution counterparties | Commercial loan/lease | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	2,954	39,737
Estimated fair value, asset derivative	37	2,263
Estimated fair value, liability derivative	6	59
Customer counterparties | Commercial loan/lease | Interest rate swap
Derivative [Line Items]
Notional amount	1,540,248	1,579,328
Estimated fair value, asset derivative	58,347	16,719
Estimated fair value, liability derivative	94	7,978
Customer counterparties | Commercial loan/lease | Interest rate cap
Derivative [Line Items]
Notional amount	627,149	606,950
Estimated fair value, asset derivative	0	4
Estimated fair value, liability derivative	43	1,109
Customer counterparties | Commercial loan/lease | Foreign currency forward contracts
Derivative [Line Items]
Notional amount	2,954	39,737
Estimated fair value, asset derivative	6	59
Estimated fair value, liability derivative	$ 37	$ 2,263

Derivative Financial Instrume_4

Derivative Financial Instruments Derivative Financial Instruments (Details 2) - Non-hedging - Commercial loan/lease - Interest rate swap	Sep. 30, 2019	Dec. 31, 2018
Interest rate received
Derivative [Line Items]
Weighted average fixed interest rate	4.03%	4.24%
Interest rate paid
Derivative [Line Items]
Weighted average fixed interest rate	3.56%	4.20%

Derivative Financial Instrume_5

Derivative Financial Instruments Derivative Financial Instruments (Details 3) $ in Thousands	Sep. 30, 2019USD ($)instrument	Dec. 31, 2018USD ($)instrument
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 67,000	$ 25,300
Risk participation agreement - participant bank
Derivative [Line Items]
Instruments held | instrument	12	13
Maximum exposure	$ 4,300	$ 1,500
Notional amount	$ 143,000	$ 149,100
Risk participation agreement - lead bank
Derivative [Line Items]
Instruments held | instrument	13	9
Notional amount	$ 166,700	$ 114,800
Non-hedging | Commercial loan/lease
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$ 62,700	$ 18,700
Non-hedging | Interest rate cap | Commercial loan/lease
Derivative [Line Items]
Weighted average fixed interest rate	3.30%	3.20%
Interest-bearing deposits
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 66,600	$ 11,200
Other assets
Derivative [Line Items]
Cash collateral pledged for derivatives	$ 410	$ 14,100

Uncategorized Items - a9302019-

Label	Element	Value
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 2,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(82,000)
AOCI Attributable to Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 84,000