Texas Capital Bancshares (TCBI) 10-Q 20 Apr 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 19, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	1,077,428
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		49,564,933

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 116,013	$ 113,707
Interest-bearing deposits	2,779,921	2,700,645
Federal funds sold and securities purchased under resale agreements	25,000	25,000
Securities, available-for-sale	42,203	24,874
Loans held for sale, at fair value	884,647	968,929
Loans held for investment, mortgage finance	3,371,598	4,497,338
Loans held for investment (net of unearned income)	13,298,918	13,001,011
Less: Allowance for loan losses	172,013	168,126
Loans held for investment, net	16,498,503	17,330,223
Mortgage servicing rights, net	45,526	28,536
Premises and equipment, net	20,831	19,775
Accrued interest receivable and other assets	432,835	465,933
Goodwill and intangible assets, net	19,395	19,512
Total assets	20,864,874	21,697,134
Non-interest-bearing
Non-interest-bearing	7,094,696	7,994,201
Interest-bearing	9,510,684	9,022,630
Total deposits	16,605,380	17,016,831
Accrued interest payable	3,293	5,498
Other liabilities	169,385	161,223
Federal funds purchased and repurchase agreements	141,834	109,575
Other borrowings	1,500,000	2,000,000
Subordinated notes, net	281,134	281,044
Trust preferred subordinated debentures	113,406	113,406
Total liabilities	18,814,432	19,687,577
Stockholders’ equity:
Preferred stock, $.01 par value, $1,000 liquidation value; Authorized shares - 10,000,000; Issued shares – 6,000,000 shares issued at June 30, 2015 and December 31, 2014, respectively	150,000	150,000
Common stock, $.01 par value; Authorized shares - 100,000,000; Issued shares – 45,813,388 and 45,735,424 at June 30, 2015 and December 31, 2014, respectively	496	495
Additional paid-in capital	956,246	955,468
Retained earnings	943,291	903,187
Treasury stock (shares at cost: 417 at March 31, 2017 and December 31, 2016)	(8)	(8)
Accumulated other comprehensive income, net of taxes	417	415
Total stockholders’ equity	2,050,442	2,009,557
Total liabilities and stockholders’ equity	$ 20,864,874	$ 21,697,134

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Mar. 31, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
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	49,560,517	49,504,079
Treasury Stock, shares	417	417

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest income
Interest and fees on loans	$ 176,624	$ 155,885
Securities	225	261
Federal funds sold and securities purchased under resale agreements	530	372
Deposits in other banks	6,567	3,285
Total interest income	183,946	159,803
Interest expense
Deposits	13,293	8,822
Federal funds purchased	252	126
Repurchase agreements	1	3
Other borrowings	2,020	1,162
Subordinated notes	4,191	4,191
Trust preferred subordinated debentures	830	716
Total interest expense	20,587	15,020
Net interest income	163,359	144,783
Provision for credit losses	9,000	30,000
Net interest income after provision for credit losses	154,359	114,783
Non-interest income
Service charges on deposit accounts	3,045	2,110
Wealth management and trust fee income	1,357	813
Bank owned life insurance (BOLI) income	466	536
Brokered loan fees	5,678	4,645
Servicing income	2,201	(55)
Swap fees	1,803	307
Other	2,560	2,941
Total non-interest income	17,110	11,297
Non-interest expense
Salaries and employee benefits	63,003	51,372
Net occupancy expense	6,111	5,812
Marketing	4,950	3,908
Legal and professional	7,453	5,324
Communications and technology	6,506	6,217
FDIC insurance assessment	5,994	5,469
Servicing related expenses	1,750	73
Other	10,327	8,645
Total non-interest expense	106,094	86,820
Income before income taxes	65,375	39,260
Income tax expense	22,833	14,132
Net income	42,542	25,128
Preferred stock dividends	2,438	2,438
Net income available to common stockholders	40,104	22,690
Other comprehensive income (loss)
Change in net unrealized gain on available-for-sale securities arising during period, before-tax	3	(38)
Income tax expense/(benefit) related to net unrealized gain on available-for-sale securities	1	(14)
Other comprehensive income/(loss), net of tax	2	(24)
Comprehensive income	$ 42,544	$ 25,104
Basic earnings per common share (usd per share)	$ 0.81	$ 0.49
Diluted earnings per common share (usd per share)	$ 0.80	$ 0.49

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 (Loss), Net of Taxes
Stockholders' equity, beginning balance at Dec. 31, 2015	$ 1,623,533	$ 150,000	$ 459	$ 714,546	$ 757,818	$ (8)	$ 718
Shares, outstanding, beginning balance at Dec. 31, 2015		6,000,000	45,874,224			417
Comprehensive income:
Net income	25,128				25,128
Change in unrealized gain on available-for-sale securities, net of taxes	(24)						(24)
Total comprehensive income	25,104
Tax benefit related to exercise of stock-based awards	40			40
Stock-based compensation expense recognized in earnings	1,132			1,132
Preferred stock dividend	(2,438)				(2,438)
Issuance of stock related to stock-based awards - value	(283)		$ 0	(283)
Issuance of stock related to stock-based awards - shares			28,682
Stockholders' equity, ending balance at Mar. 31, 2016	1,647,088	$ 150,000	$ 459	715,435	780,508	$ (8)	694
Shares, outstanding, ending balance at Mar. 31, 2016		6,000,000	45,902,906			417
Stockholders' equity, beginning balance at Dec. 31, 2016	2,009,557	$ 150,000	$ 495	955,468	903,187	$ (8)	415
Shares, outstanding, beginning balance at Dec. 31, 2016		6,000,000	49,504,079			417
Comprehensive income:
Net income	42,542				42,542
Change in unrealized gain on available-for-sale securities, net of taxes	2						2
Total comprehensive income	42,544
Stock-based compensation expense recognized in earnings	1,669			1,669
Preferred stock dividend	(2,438)				(2,438)
Issuance of stock related to stock-based awards - value	(890)		$ (1)	(891)
Issuance of stock related to stock-based awards - shares			22,843
Stockholders' equity, ending balance at Mar. 31, 2017	2,050,442	$ 150,000	$ 496	956,246	$ 943,291	$ (8)	$ 417
Shares, outstanding, ending balance at Mar. 31, 2017		6,000,000	49,560,517			417
Comprehensive income:
Stock Issued During Period, Shares, Other			33,595
Stock Issued During Period, Value, Other	$ 0		$ 0	$ 0

CONSOLIDATED STATEMENTS OF STO6

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Stockholders' Equity [Abstract]
Income tax expense/(benefit) related to net unrealized gain on available-for-sale securities	$ 1	$ (14)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Income from continuing operations	$ 42,542	$ 25,128
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	9,000	30,000
Depreciation and amortization	6,216	5,092
Bank owned life insurance (BOLI) income	(466)	(536)
Stock-based compensation expense	(4,559)	(459)
Excess tax benefits from stock-based compensation arrangements	0	(109)
Purchases of loans held for sale	1,299,542	364,919
Proceeds from sales and repayments of loans held for sale	1,379,834	352,668
(Gain) loss on sale of loans held for sale and other assets	988	104
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	19,548	(48,756)
Accrued interest payable and other liabilities	(927)	6,173
Net cash provided by operating activities	161,752	5,304
Investing activities
Purchases of available-for-sale securities	(18,832)	0
Maturities and calls of available-for-sale securities	275	264
Principal payments received on available-for-sale securities	1,231	1,620
Originations of mortgage finance loans	(15,100,024)	(19,706,715)
Proceeds from pay-offs of mortgage finance loans	16,225,764	19,691,687
Net increase in loans held for investment, excluding mortgage finance loans	(303,595)	(321,571)
Purchase of premises and equipment, net	(2,597)	(859)
Proceeds from sale of foreclosed assets	128	62
Net cash provided by (used in) investing activities	802,350	(335,903)
Financing activities
Net increase (decrease) in deposits	(411,451)	1,214,228
Costs from issuance of stock related to stock-based awards and warrants	(890)	(283)
Preferred dividends paid	(2,438)	(2,438)
Net increase in other borrowings	(500,000)	104,000
Excess tax benefits from stock-based compensation arrangements	0	109
Net increase (decrease) in Federal funds purchased and repurchase agreements	32,259	(42,192)
Net cash provided by (used in) financing activities	(882,520)	1,273,424
Net increase in cash and cash equivalents	81,582	942,825
Cash and cash equivalents at beginning of period	2,839,352	1,790,870
Cash and cash equivalents at end of period	2,920,934	2,733,695
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	22,792	17,237
Cash paid during the period for income taxes	482	333
Transfers from loans/leases to OREO and other repossessed assets	$ 0	$ 17,398

OPERATIONS AND SUMMARY OF SIGNI

OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	3 Months Ended
	Mar. 31, 2017
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 and national clientèle of commercial borrowers. We are primarily a secured lender, with our greatest concentration of loans in Texas. 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. In that regard, ASU 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting," ("ASU 2016-09") became effective for us on January 1, 2017. ASU 2016-09 requires that excess tax benefits and deficiencies be recognized as a component of income taxes within the income statement. Additionally, ASU 2016-09 requires that all income tax-related cash flows resulting from share-based payments be reported as operating activities in the statement of cash flows. Previously, income tax benefits at award settlement were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. We have elected to apply that change in cash flow presentation on a prospective basis. ASU 2016-09 also requires that companies make an accounting policy election regarding forfeitures, to either estimate the number of awards that are expected to vest or account for them when they occur. We have elected to recognize forfeitures as they occur. The impact of this change and that of the remaining provisions of ASU 2016-09 did not have a significant impact on our financial statements. The consolidated interim financial statements have been prepared without audit. 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, 2016 , included in our Annual Report on Form 10-K filed with the SEC on February 17, 2017 (the “ 2016 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. 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 stock-based compensation awards, the fair values of financial instruments and the status of contingencies are particularly susceptible to significant change.

EARNINGS PER COMMON SHARE

EARNINGS PER COMMON SHARE	3 Months Ended
	Mar. 31, 2017
Earnings Per Share [Abstract]
EARNINGS PER COMMON SHARE	EARNINGS PER COMMON SHARE The following table presents the computation of basic and diluted earnings per share (in thousands except per share data): Three months ended 2017 2016 Numerator: Net income $ 42,542 $ 25,128 Preferred stock dividends 2,438 2,438 Net income available to common stockholders $ 40,104 22,690 Denominator: Denominator for basic earnings per share— weighted average shares 49,535,959 45,888,735 Effect of employee stock-based awards (1) 260,947 117,372 Effect of warrants to purchase common stock 437,324 348,271 Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions 50,234,230 46,354,378 Basic earnings per common share $ 0.81 $ 0.49 Diluted earnings per common share $ 0.80 $ 0.49 (1) SARs and RSUs outstanding of 3,000 at March 31, 2017 and 308,972 at March 31, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

SECURITIES

SECURITIES	3 Months Ended
	Mar. 31, 2017
Available-for-sale Securities [Abstract]
SECURITIES	SECURITIES The following is a summary of available-for-sale securities (in thousands): March 31, 2017 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: U.S. Treasuries $ 16,688 $ — $ (5 ) $ 16,683 Residential mortgage-backed securities 13,449 927 — 14,376 Equity securities (1) 11,424 101 (381 ) 11,144 $ 41,561 $ 1,028 $ (386 ) $ 42,203 December 31, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Estimated Fair Value Available-for-sale securities: Residential mortgage-backed securities $ 14,680 $ 972 $ — $ 15,652 Municipals 275 — — 275 Equity securities (1) 9,280 27 (360 ) 8,947 $ 24,235 $ 999 $ (360 ) $ 24,874 (1) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. The amortized cost and estimated fair value of available-for-sale securities are presented below by contractual maturity (in thousands, except percentage data): March 31, 2017 Less Than One Year After One Through Five Years After Five Through Ten Years After Ten Years Total Available-for-sale: U.S. Treasuries: Amortized cost $ 16,688 $ — $ — $ — $ 16,688 Estimated fair value 16,683 — — — 16,683 Weighted average yield (3) 0.53 % — % — % — % 0.53 % Residential mortgage-backed securities: (1) Amortized cost 47 1,522 2,925 8,955 13,449 Estimated fair value 47 1,572 3,253 9,504 14,376 Weighted average yield (3) 5.25 % 4.69 % 5.55 % 2.85 % 3.65 % Equity securities: (4) Amortized cost 11,424 — — — 11,424 Estimated fair value 11,144 — — — 11,144 Total available-for-sale securities: Amortized cost $ 41,561 Estimated fair value $ 42,203 December 31, 2016 Less Than One Year After One Through Five Years After Five Through Ten Years After Ten Years Total Available-for-sale: Residential mortgage-backed securities: (1) Amortized cost $ 9 $ 2,047 $ 3,147 $ 9,477 $ 14,680 Estimated fair value 9 2,104 3,495 10,044 15,652 Weighted average yield (3) 5.50 % 4.70 % 5.55 % 2.84 % 3.68 % Municipals: (2) Amortized cost 275 — — — 275 Estimated fair value 275 — — — 275 Weighted average yield (3) 5.61 % — % — % — % 5.61 % Equity securities: (4) Amortized cost 9,280 — — — 9,280 Estimated fair value 8,947 — — — 8,947 Total available-for-sale securities: Amortized cost $ 24,235 Estimated fair value $ 24,874 (1) Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. (2) Yields have been adjusted to a tax equivalent basis assuming a 35% federal tax rate. (3) Yields are calculated based on amortized cost. (4) These equity securities do not have a stated maturity. At March 31, 2017 , securities with carrying values of $3.6 million and $9.4 million were pledged to secure certain deposits and repurchase agreements, respectively. The following table discloses, as of March 31, 2017 and December 31, 2016 , our investment securities 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 (in thousands): March 31, 2017 Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss U.S. Treasuries $ 16,683 $ (5 ) $ — $ — $ 16,683 $ (5 ) Equity securities 1,015 (6 ) 6,125 (375 ) 7,140 (381 ) $ 17,698 $ (11 ) $ 6,125 $ (375 ) $ 23,823 $ (386 ) December 31, 2016 Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Equity securities $ 1,015 $ (6 ) $ 6,146 $ (354 ) $ 7,161 $ (360 ) At March 31, 2017 , we owned five securities in an unrealized loss position, three of which are U.S. Treasury securities which are subject to interest rate volatility. We do not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost bases. The remaining two are publicly traded equity funds and are subject to market pricing volatility. We do not believe these unrealized losses are “other-than-temporary”. We have evaluated the near-term prospects of the investments in relation to the severity and duration of the impairment and based on that evaluation have the ability and intent to hold the investments until recovery of fair value.

LOANS AND ALLOWANCE FOR LOAN LO

LOANS AND ALLOWANCE FOR LOAN LOSSES	3 Months Ended
	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans and allowance for credit losses	LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR LOAN LOSSES At March 31, 2017 and December 31, 2016 , loans held for investment were as follows (in thousands): March 31, December 31, Commercial $ 7,480,485 $ 7,291,545 Mortgage finance 3,371,598 4,497,338 Construction 2,108,611 2,098,706 Real estate 3,563,136 3,462,203 Consumer 36,259 34,587 Leases 186,113 185,529 Gross loans held for investment 16,746,202 17,569,908 Deferred income (net of direct origination costs) (75,686 ) (71,559 ) Allowance for loan losses (172,013 ) (168,126 ) Total loans held for investment $ 16,498,503 $ 17,330,223 Commercial Loans and Leases. Our commercial loan portfolio is comprised of lines of credit for working capital and term loans and leases to finance equipment and other business assets. Our energy production loans are generally collateralized with proven reserves based on appropriate valuation standards and take into account the risk of oil and gas price volatility. Our commercial loans and leases are underwritten after carefully evaluating and understanding the borrower’s ability to operate profitably. Our underwriting standards are designed to promote relationship banking rather than to make loans on a transaction basis. Our lines of credit typically are limited to a percentage of the value of the assets securing the line. Lines of credit and term loans typically are reviewed annually, or more frequently, as needed, and are supported by accounts receivable, inventory, equipment and other assets of our clients’ businesses. Mortgage Finance Loans. Our mortgage finance loans consist of ownership interests purchased in single-family residential mortgages funded through our mortgage finance group. These loans are typically held on our balance sheet for 10 to 20 days. We have agreements with mortgage lenders and purchase interests in individual loans they originate. All loans are underwritten consistent with established programs for permanent financing with financially sound investors. Substantially all loans are conforming loans. Balances as of March 31, 2017 and December 31, 2016 are stated net of $230.5 million and $839.0 million participations sold, respectively. Construction Loans. Our construction loan portfolio consists primarily of single- and multi-family residential properties and commercial projects used in manufacturing, warehousing, service or retail businesses. Our construction loans generally have terms of one to three years. We typically make construction loans to developers, builders and contractors that have an established record of successful project completion and loan repayment and have a substantial equity investment in the borrowers. Loan amounts are derived primarily from the Bank's evaluation of expected cash flows available to service debt from stabilized projects under hypothetically stressed conditions. Construction loans are also based in part upon estimates of costs and value associated with the completed project. Sources of repayment for these types of loans may be pre-committed permanent loans from other lenders, sales of developed property, or an interim loan commitment from us until permanent financing is obtained. The nature of these loans makes ultimate repayment sensitive to overall economic conditions. Borrowers may not be able to correct conditions of default in loans, increasing risk of exposure to classification, non-performing status, reserve allocation and actual credit loss and foreclosure. These loans typically have floating rates and commitment fees. Real Estate Loans. A portion of our real estate loan portfolio is comprised of loans secured by properties other than market risk or investment-type real estate. Market risk loans are real estate loans where the primary source of repayment is expected to come from the sale, permanent financing or lease of the real property collateral. We generally provide temporary financing for commercial and residential property. These loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate. Our real estate loans generally have maximum terms of five to seven years, and we provide loans with both floating and fixed rates. We generally avoid long-term loans for commercial real estate held for investment. Real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy. Appraised values may be highly variable due to market conditions and the impact of the inability of potential purchasers and lessees to obtain financing and a lack of transactions at comparable values. At March 31, 2017 and December 31, 2016 , we had a blanket floating lien on certain real estate-secured loans, mortgage finance loans and certain securities used as collateral for Federal Home Loan Bank (“FHLB”) borrowings. Summary of Loan Loss Experience The allowance for loan losses is comprised of specific reserves for impaired loans and an additional qualitative reserve based on our estimate of losses inherent in the portfolio at the balance sheet date, but not yet identified with specified loans. We consider the allowance at March 31, 2017 to be appropriate, given management's assessment of losses inherent in the portfolio as of the evaluation date, the significant growth in the loan and lease portfolio, current economic conditions in our market areas and other factors. The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Grade: Pass $ 7,161,580 $ 3,371,598 $ 2,106,255 $ 3,528,210 $ 35,554 $ 182,869 $ 16,386,066 Special mention 51,723 — 2,356 12,904 370 3,161 70,514 Substandard-accruing 125,095 — — 17,843 135 — 143,073 Non-accrual 142,087 — — 4,179 200 83 146,549 Total loans held for investment $ 7,480,485 $ 3,371,598 $ 2,108,611 $ 3,563,136 $ 36,259 $ 186,113 $ 16,746,202 December 31, 2016 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Grade: Pass $ 6,941,310 $ 4,497,338 $ 2,074,859 $ 3,430,346 $ 34,249 $ 181,914 $ 17,160,016 Special mention 69,447 — 10,901 21,932 — 3,532 105,812 Substandard-accruing 115,848 — 12,787 7,516 138 — 136,289 Non-accrual 164,940 — 159 2,409 200 83 167,791 Total loans held for investment $ 7,291,545 $ 4,497,338 $ 2,098,706 $ 3,462,203 $ 34,587 $ 185,529 $ 17,569,908 The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 and 2016 . Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. March 31, 2017 (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Leases Additional Qualitative Reserve Total Beginning balance $ 128,768 $ — $ 13,144 $ 19,149 $ 241 $ 1,124 $ 5,700 $ 168,126 Provision for loan losses 8,147 — (124 ) 3,270 (31 ) 325 (2,012 ) 9,575 Charge-offs 9,233 — — — — — — 9,233 Recoveries 3,381 — 101 50 5 8 — 3,545 Net charge-offs (recoveries) 5,852 — (101 ) (50 ) (5 ) (8 ) — 5,688 Ending balance $ 131,063 $ — $ 13,121 $ 22,469 $ 215 $ 1,457 $ 3,688 $ 172,013 Period end amount allocated to: Loans individually evaluated for impairment $ 34,595 $ — $ — $ 195 $ 30 $ 13 $ — $ 34,833 Loans collectively evaluated for impairment 96,468 — 13,121 22,274 185 1,444 3,688 137,180 Ending balance $ 131,063 $ — $ 13,121 $ 22,469 $ 215 $ 1,457 $ 3,688 $ 172,013 March 31, 2016 (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Leases Additional Qualitative Reserve Total Beginning balance $ 112,446 $ — $ 6,836 $ 13,381 $ 338 $ 3,931 $ 4,179 $ 141,111 Provision for loan losses 26,581 — 1,050 1,134 (15 ) (2,435 ) 2,480 28,795 Charge-offs 8,496 — — — — — — 8,496 Recoveries 1,040 — — 8 7 45 — 1,100 Net charge-offs (recoveries) 7,456 — — (8 ) (7 ) (45 ) — 7,396 Ending balance $ 131,571 $ — $ 7,886 $ 14,523 $ 330 $ 1,541 $ 6,659 $ 162,510 Period end amount allocated to: Loans individually evaluated for impairment $ 31,415 $ — $ — $ 1,183 $ — $ 51 $ — $ 32,649 Loans collectively evaluated for impairment 100,156 — 7,886 13,340 330 1,490 6,659 129,861 Ending balance $ 131,571 $ — $ 7,886 $ 14,523 $ 330 $ 1,541 $ 6,659 $ 162,510 The table below presents the activity in the portion of the allowance for credit losses related to losses on unfunded commitments for the three months ended March 31, 2017 and 2016 (in thousands). This liability is recorded in other liabilities in the consolidated balance sheet. Three months ended March 31, 2017 2016 Beginning balance $ 11,422 $ 9,011 Provision for off-balance sheet credit losses (575 ) 1,205 Ending balance $ 10,847 $ 10,216 We have traditionally maintained an additional qualitative reserve component to compensate for the uncertainty and complexity in estimating loan and lease losses including factors and conditions that may not be fully reflected in the determination and application of the allowance allocation percentages. We believe the level of additional qualitative reserve at March 31, 2017 is warranted due to the continued uncertain economic environment which has produced losses, including those resulting from borrowers' misstatement of financial information or inaccurate certification of collateral values. Such losses are not necessarily correlated with historical loss trends or general economic conditions. Our methodology used to calculate the allowance considers historical losses; however, the historical loss rates for specific product types or credit risk grades may not fully incorporate the effects of continued weakness in the economy and continued volatility in the energy sector. Our recorded investment in loans as of March 31, 2017 , December 31, 2016 and March 31, 2016 related to each balance in the allowance for loan losses by portfolio segment and disaggregated on the basis of our impairment methodology was as follows (in thousands): March 31, 2017 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Loans individually evaluated for impairment $ 143,632 $ — $ — $ 5,512 $ 200 $ 83 $ 149,427 Loans collectively evaluated for impairment 7,336,853 3,371,598 2,108,611 3,557,624 36,059 186,030 16,596,775 Total $ 7,480,485 $ 3,371,598 $ 2,108,611 $ 3,563,136 $ 36,259 $ 186,113 $ 16,746,202 December 31, 2016 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Loans individually evaluated for impairment $ 166,669 $ — $ 159 $ 3,751 $ 200 $ 83 $ 170,862 Loans collectively evaluated for impairment 7,124,876 4,497,338 2,098,547 3,458,452 34,387 185,446 17,399,046 Total $ 7,291,545 $ 4,497,338 $ 2,098,706 $ 3,462,203 $ 34,587 $ 185,529 $ 17,569,908 March 31, 2016 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Loans individually evaluated for impairment $ 167,832 $ — $ — $ 8,397 $ — $ 343 $ 176,572 Loans collectively evaluated for impairment 6,721,967 4,981,304 1,958,370 3,128,584 26,439 104,117 16,920,781 Total $ 6,889,799 $ 4,981,304 $ 1,958,370 $ 3,136,981 $ 26,439 $ 104,460 $ 17,097,353 Generally we place loans on non-accrual when there is a clear indication that the borrower’s cash flow may not be sufficient to meet payments as they become due, which is generally when a loan is 90 days past due. When a loan is placed on non-accrual status, all previously accrued and unpaid interest is reversed. Interest income is subsequently recognized on a cash basis as long as the remaining unpaid principal amount of the loan is deemed to be fully collectible. If collectability is questionable, then cash payments are applied to principal. As of March 31, 2017 , none of our non-accrual loans were earning on a cash basis compared to $ 811,000 at December 31, 2016 . A loan is placed back on accrual status when both principal and interest are current and it is probable that we will be able to collect all amounts due (both principal and interest) according to the terms of the loan agreement. A loan held for investment is considered impaired when, based on current information and events, it is probable that we will be unable to collect all amounts due (both principal and interest) according to the terms of the original loan agreement. In accordance with ASC 310 Receivables , we have also included all restructured and formerly restructured loans in our impaired loan totals. The following tables detail our impaired loans, by portfolio class, as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Business loans $ 25,149 $ 30,093 $ — $ 24,295 $ — Energy 39,050 39,306 — 44,185 — Construction Market risk — — — — — Real estate Market risk — — — — — Commercial 2,618 2,618 — 2,261 — Secured by 1-4 family — — — — — Consumer — — — — — Leases — — — — — Total impaired loans with no allowance recorded $ 66,817 $ 72,017 $ — $ 70,741 $ — With an allowance recorded: Commercial Business loans $ 26,146 $ 26,146 $ 8,378 $ 22,917 $ — Energy 53,287 71,555 26,217 67,592 6 Construction Market risk — — — 106 — Real estate Market risk 1,333 1,333 29 1,339 — Commercial — — — — — Secured by 1-4 family 1,561 1,561 166 738 — Consumer 200 200 30 200 — Leases 83 83 13 83 — Total impaired loans with an allowance recorded $ 82,610 $ 100,878 $ 34,833 $ 92,975 $ 6 Combined: Commercial Business loans $ 51,295 $ 56,239 $ 8,378 $ 47,212 $ — Energy 92,337 110,861 26,217 111,777 6 Construction Market risk — — — 106 — Real estate Market risk 1,333 1,333 29 1,339 — Commercial 2,618 2,618 — 2,261 — Secured by 1-4 family 1,561 1,561 166 738 — Consumer 200 200 30 200 — Leases 83 83 13 83 — Total impaired loans $ 149,427 $ 172,895 $ 34,833 $ 163,716 $ 6 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Business loans $ 23,868 $ 27,992 $ — $ 12,361 $ — Energy 46,753 54,522 — 54,075 — Construction Market risk — — — 2,778 — Real estate Market risk — — — — — Commercial 2,083 2,083 — 4,483 38 Secured by 1-4 family — — — — — Consumer — — — — — Leases — — — 403 — Total impaired loans with no allowance recorded $ 72,704 $ 84,597 $ — $ 74,100 $ 38 With an allowance recorded: Commercial Business loans $ 21,303 $ 21,303 $ 7,055 $ 22,277 $ — Energy 74,745 88,987 27,350 73,637 24 Construction Market risk 159 159 24 53 — Real estate Market risk 1,342 1,342 20 3,000 — Commercial — — — — — Secured by 1-4 family 326 326 113 435 — Consumer 200 200 30 67 — Leases 83 83 13 548 — Total impaired loans with an allowance recorded $ 98,158 $ 112,400 $ 34,605 $ 100,017 $ 24 Combined: Commercial Business loans $ 45,171 $ 49,295 $ 7,055 $ 34,638 $ — Energy 121,498 143,509 27,350 127,712 24 Construction Market risk 159 159 24 2,831 — Real estate Market risk 1,342 1,342 20 3,000 — Commercial 2,083 2,083 — 4,483 38 Secured by 1-4 family 326 326 113 435 — Consumer 200 200 30 67 — Leases 83 83 13 951 — Total impaired loans $ 170,862 $ 196,997 $ 34,605 $ 174,117 $ 62 Average impaired loans outstanding during the three months ended March 31, 2017 and 2016 totaled $163.7 million and $ 181.1 million , respectively. The table below provides an age analysis of our loans held for investment as of March 31, 2017 (in thousands): 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days and Accruing(1) Total Past Due Non-accrual Current Total Commercial Business loans $ 30,716 $ 6,923 $ 7,359 $ 44,998 $ 49,750 $ 6,484,545 $ 6,579,293 Energy — — — — 92,337 808,855 901,192 Mortgage finance loans — — — — — 3,371,598 3,371,598 Construction Market risk 2,553 — — 2,553 — 2,081,308 2,083,861 Secured by 1-4 family — — — — — 24,750 24,750 Real estate Market risk 112 — 1,333 1,445 — 2,652,833 2,654,278 Commercial — 274 — 274 2,618 689,414 692,306 Secured by 1-4 family 4,225 — 107 4,332 1,561 210,659 216,552 Consumer 360 98 — 458 200 35,601 36,259 Leases — — — — 83 186,030 186,113 Total loans held for investment $ 37,966 $ 7,295 $ 8,799 $ 54,060 $ 146,549 $ 16,545,593 $ 16,746,202 (1) Loans past due 90 days and still accruing includes premium finance loans of $5.1 million . These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date. Restructured loans are loans on which, due to the borrower’s financial difficulties, we have granted a concession that we would not otherwise consider for borrowers of similar credit quality. This may include a transfer of real estate or other assets from the borrower, a modification of loan terms, or a combination of the two. Modifications of terms that could potentially qualify as a restructuring include reduction of the contractual interest rate, extension of the maturity date at a contractual interest rate lower than the current rate for new debt with similar risk, a reduction of the face amount of debt or forgiveness of either principal or accrued interest. At March 31, 2017 and December 31, 2016 , we did not have any loans considered restructured that were not on non-accrual. Of the non-accrual loans at March 31, 2017 and December 31, 2016 , $18.5 million and $18.1 million , respectively, met the criteria for restructured. These loans had no unfunded commitments at their respective balance sheet dates. A loan continues to qualify as restructured until a consistent payment history or change in borrower’s financial condition has been evidenced, generally over no less than twelve months. Assuming that the restructuring agreement specifies an interest rate at the time of the restructuring that is greater than or equal to the rate that we are willing to accept for a new extension of credit with comparable risk, then the loan no longer has to be considered a restructuring if it is in compliance with the modified terms in calendar years after the year of the restructure. The following table summarizes, for the three months ended March 31, 2017 and 2016 , loans that were restructured during 2017 and 2016 (in thousands): March 31, 2017 Number of Restructured Loans Pre-Restructuring Outstanding Recorded Investment Post-Restructuring Outstanding Recorded Investment Energy loans 1 $ 1,070 $ 1,070 Commercial business loans 1 $ 599 $ 599 Total new restructured loans in 2017 2 $ 1,669 $ 1,669 March 31, 2016 Number of Restructured Loans Pre-Restructuring Outstanding Recorded Investment Post-Restructuring Outstanding Recorded Investment Energy loans 2 $ 14,235 $ 14,235 Total new restructured loans in 2016 2 $ 14,235 $ 14,235 The restructured loans generally include terms to temporarily place loans on interest only, extend the payment terms or reduce the interest rate. We did not forgive any principal on the above loans. The restructuring of the loans did not have a significant impact on our allowance for loan losses at March 31, 2017 or 2016 . The following table provides information on how restructured loans were modified during the three months ended March 31, 2017 and 2016 (in thousands): Three months ended March 31, 2017 2016 Extended maturity $ 1,070 $ — Adjusted payment schedule — 12,916 Combination of maturity extension and payment schedule adjustment — 1,319 Other 599 — Total $ 1,669 $ 14,235 As of March 31, 2017 and 2016 , 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	3 Months Ended
	Mar. 31, 2017
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 (in thousands): Three months ended March 31, 2017 2016 Beginning balance $ 18,961 $ 278 Additions — 17,398 Sales (128 ) (91 ) Valuation allowance for OREO — — Direct write-downs — — Ending balance $ 18,833 $ 17,585 When foreclosure occurs, the acquired asset is recorded at fair value less selling costs, generally based on appraised value, which may result in partial charge-off of the loan. Subsequent write-downs required for declines in value are recorded through a valuation allowance or taken directly to the assets, charged to other non-interest expense. We did not record a valuation allowance during the three months ended March 31, 2017 and 2016 .

CERTAIN TRANSFERS OF FINANCIAL

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Notes)	3 Months Ended
	Mar. 31, 2017
Transfers and Servicing [Abstract]
CERTAIN TRANSFERS OF FINANCIAL ASSETS	CERTAIN TRANSFERS OF FINANCIAL ASSETS Through our Mortgage Correspondent Aggregation ("MCA") business, we commit to purchase residential mortgage loans from independent correspondent lenders and deliver those loans into the secondary market via whole loan sales to independent third parties or in securitization transactions to Ginnie Mae and government sponsored entities ("GSEs") such as Fannie Mae and Freddie Mac. We have elected to carry these loans at fair value based on sales commitments and market quotes. Changes in the fair value of the loans held for sale are included in other non-interest income. Residential mortgage loans are subject to both credit and interest rate risk. Credit risk is managed through underwriting policies and procedures, including collateral requirements, which are generally accepted by the secondary loan markets. Exposure to interest rate fluctuations is partially managed through forward sales contracts, which set the price for loans that will be delivered in the next 60 to 90 days. The table below presents the unpaid principal balance of loans held for sale and related fair values at March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 December 31, 2016 Unpaid principal balance $ 880,156 $ 980,414 Fair value 884,647 968,929 Fair value over/(under) unpaid principal balance $ 4,491 $ (11,485 ) No loans held for sale were 90 days or more past due or on non-accrual as of March 31, 2017 and December 31, 2016 . The table below presents a reconciliation of the changes in loans held for sale for the three months ended March 31, 2017 and 2016 (in thousands): Three months ended March 31, 2017 2016 Beginning balance $ 968,929 $ 86,075 Loans purchased 1,299,542 364,919 Payments and loans sold (1,399,800 ) (357,018 ) Change in fair value 15,976 726 Ending balance $ 884,647 $ 94,702 We generally retain the right to service the loans sold, creating mortgage servicing rights ("MSRs") which are recorded as assets on our balance sheet. A summary of MSR activity for the three months ended March 31, 2017 and 2016 is as follows (in thousands): Three months ended March 31, 2017 2016 Servicing asset: Balance, beginning of year(1) $ 28,536 $ 423 Capitalized servicing rights 18,094 3,903 Amortization (1,104 ) (40 ) Balance, end of period $ 45,526 $ 4,286 Valuation allowance: Balance, beginning of year $ — $ — Increase in valuation allowance — 33 Balance, end of period $ — $ 33 Servicing asset, net(1) $ 45,526 $ 4,253 Fair value $ 48,013 $ 4,253 (1) MSRs are reported on the consolidated balance sheets at lower of cost or market. At March 31, 2017 and December 31, 2016 , our servicing portfolio of residential mortgage loans sold included 13,955 and 8,618 loans, respectively, with an outstanding principal balance of $3.5 billion and $2.2 billion , respectively. In connection with the servicing of these loans, we maintain escrow funds for taxes and insurance in the name of investors, as well as collections in transit to investors. These escrow funds are segregated and held in separate non-interest-bearing accounts at the Bank. These deposits, included in total non-interest-bearing deposits on the consolidated balance sheets, were $31.4 million at March 31, 2017 and $21.0 million at December 31, 2016 . The estimated fair value of the MSR assets is obtained from an independent third party on a quarterly basis. MSRs 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 collateral, where available. Each quarter, management and the independent third party discuss the key assumptions used in the discounted cash flow model and make adjustments as necessary to estimate the fair value of the MSRs. As of March 31, 2017 and December 31, 2016 , management used the following assumptions to determine the fair value of MSRs: March 31, 2017 December 31, 2016 Average discount rates 9.91 % 9.96 % Expected prepayment speeds 8.10 % 7.91 % Weighted average life, in years 7.9 8.0 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): March 31, 2017 December 31, 2016 50 bp adverse change in prepayment speed $ (4,471 ) $ (2,833 ) 100 bp adverse change in prepayment speed (10,835 ) (6,812 ) These sensitivities are hypothetical and should be evaluated with care. The effect on fair value of a 10% variation in assumptions generally cannot be determined 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 lead to changes in other factors, which could impact the above hypothetical effects. Also, a positive change in the above assumptions would not necessarily correlate with the corresponding decrease in the net carrying amount of the excess spread financing. In conjunction with the sale and securitization of loans held for sale, we may be exposed to liability resulting from recourse agreements and repurchase agreements. If it is determined subsequent to our sale of a loan that the loan sold is in breach of the representations or warranties made in the applicable sale agreement, we may have an obligation to either (a) repurchase the loan for the unpaid principal balance, accrued interest and related advances, (b) indemnify the purchaser against any loss it suffers or (c) make the purchaser whole for the economic benefits of the loan. Our repurchase, indemnification and make whole obligations vary based upon the terms of the applicable agreements, the nature of the asserted breach and the status of the mortgage loan at the time a claim is made. We establish reserves for estimated losses of this nature inherent in the origination of mortgage loans by estimating the losses inherent in the population of all loans sold based on trends in claims and actual loss severities experienced. The reserve includes accruals for probable contingent losses in addition to those identified in the pipeline of claims received. The estimation process is designed to include amounts based on any actual losses experienced from actual repurchase activity. Because the MCA business commenced in late 2015, we have limited historical data to support the establishment of a reserve. The baseline for the repurchase reserve uses historical loss factors obtained from industry data that are applied to loan pools originated and sold during the three months ended March 31, 2017 and 2016 . The historical industry data loss factors and experienced losses are accumulated for each sale vintage (year loan was sold) and applied to more recent sale vintages to estimate inherent losses not yet realized. Our estimated exposure related to these loans was $971,000 at March 31, 2017 and $178,000 at March 31, 2016 and is recorded in other liabilities in the consolidated balance sheets. We had no losses due to repurchase, indemnification or make-whole obligations during the three months ended March 31, 2017 and 2016 .

FINANCIAL INSTRUMENTS WITH OFF-

FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK	3 Months Ended
	Mar. 31, 2017
Risks and Uncertainties [Abstract]
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK	FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK The Bank is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include commitments to extend credit and standby letters of credit that involve varying degrees of credit risk in excess of the amount recognized in the consolidated balance sheets. The Bank’s exposure to credit loss in the event of non-performance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of these instruments. The Bank uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the borrower. Commitments to extend credit are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Bank evaluates each customer’s credit-worthiness on a case-by-case basis. Standby letters of credit are conditional commitments issued by the Bank to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loan facilities to customers. The table below summarizes our off-balance sheet financial instruments whose contract amounts represented credit risk (in thousands): March 31, 2017 December 31, 2016 Commitments to extend credit $ 5,829,713 $ 5,704,381 Standby letters of credit 171,451 171,266

REGULATORY MATTERS

REGULATORY MATTERS	3 Months Ended
	Mar. 31, 2016
Regulatory Capital Requirements [Abstract]
REGULATORY MATTERS	REGULATORY MATTERS 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 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) establish the capital measure called "Common Equity Tier 1" ("CET1"), (ii) specify that Tier 1 capital consist of CET1 and "Additional Tier 1 Capital" instruments meeting stated requirements, (iii) define CET1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to CET1 and not to the other components of capital and (iv) set forth the acceptable scope of deductions/adjustments to the specified capital measures. The Basel III Capital Rules became effective for us on January 1, 2015 with certain transition provisions fully phased in on January 1, 2019. Additionally, the Basel III Capital Rules require that we maintain a capital conservation buffer with respect to each of the 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 will be fully phased in on January 1, 2019 at 2.5%. The required phase-in capital conservation buffer during 2017 is 1.25% and was 0.625% during 2016 . 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 these regulations 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 March 31, 2017 , that the Company and the Bank met 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 capital, Tier 1 risk-based capital, 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 March 31, 2017 , and December 31, 2016 . 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 changes could result in reducing 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 Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio As of March 31, 2017: CET1 Company $ 1,881,329 9.61 % $ 1,125,456 5.75 % $ 1,370,121 7.00 % N/A N/A Bank 1,778,152 9.09 % 1,125,405 5.75 % 1,370,058 7.00 % 1,272,197 6.50 % Total capital (to risk-weighted assets) Company 2,603,536 13.30 % 1,810,516 9.25 % 2,055,181 10.50 % N/A N/A Bank 2,341,922 11.97 % 1,810,434 9.25 % 2,055,088 10.50 % 1,957,226 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,139,542 10.93 % 1,419,053 7.25 % 1,663,718 8.50 % N/A N/A Bank 1,936,365 9.89 % 1,418,989 7.25 % 1,663,642 8.50 % 1,565,781 8.00 % Tier 1 capital (to average assets)(1) Company 2,139,542 10.27 % 833,706 4.00 % 833,706 4.00 % N/A N/A Bank 1,936,365 9.29 % 833,510 4.00 % 833,510 4.00 % 1,041,888 5.00 % As of December 31, 2016: CET1 Company $ 1,841,219 8.97 % $ 1,052,205 5.125 % $ 1,437,159 7.00 % N/A N/A Bank 1,735,496 8.45 % 1,051,989 5.125 % 1,436,863 7.00 % 1,334,244 6.50 % Total capital (to risk-weighted assets) Company 2,561,663 12.48 % 1,770,766 8.625 % 2,155,715 10.50 % N/A N/A Bank 2,297,528 11.19 % 1,770,421 8.625 % 2,155,295 10.50 % 2,052,683 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,101,071 10.23 % 1,360,154 6.625 % 1,745,103 8.50 % N/A N/A Bank 1,895,348 9.23 % 1,359,888 6.625 % 1,744,762 8.50 % 1,642,147 8.00 % Tier 1 capital (to average assets)(1) Company 2,101,071 9.34 % 900,268 4.00 % 900,268 4.00 % N/A N/A Bank 1,895,348 8.42 % 900,070 4.00 % 900,070 4.00 % 1,125,087 5.00 % (1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, it should be noted that 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 March 31, 2017 , our total mortgage finance loans were $3.4 billion compared to the average for the quarter ended March 31, 2017 of $2.8 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, the quarter-end fluctuation in these balances can significantly impact our reported ratios. We manage capital allocated to mortgage finance loans based on changing trends in average balances, as well as the inherent risk associated with the assets which implies a risk weight that is significantly different than the regulatory risk weight, and do not believe that the quarter-end balance is representative of risk characteristics that would justify higher capital allocations. However, we continue to monitor our capital allocation to confirm that all capital levels remain above well-capitalized levels. Dividends that may be paid by subsidiary banks are routinely restricted by various regulatory authorities. The amount that can be paid in any calendar year without prior approval of the 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 common stock during the three months ended March 31, 2017 or 2016 .

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION	3 Months Ended
	Mar. 31, 2017
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 under the plans. Stock-based compensation expense presented below consists of awards granted from 2011 through March 31, 2017 . Three months ended March 31, (in thousands) 2017 2016 Stock-settled awards: SARs $ 72 $ 82 RSUs 1,593 1,048 Restricted stock 4 2 Cash-settled performance units 2,890 (673 ) Total $ 4,559 $ 459 (in thousands) March 31, 2017 Unrecognized compensation expense related to unvested stock-settled awards $ 20,117 Weighted average period over which expense is expected to be recognized, in years 3.2

FAIR VALUE DISCLOSURES

FAIR VALUE DISCLOSURES	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
FAIR VALUE DISCLOSURES	FAIR VALUE DISCLOSURES ASC 820, Fair Value Measurements and Disclosures (“ASC 820”), defines fair value, establishes a framework for measuring fair value under GAAP and requires enhanced disclosures about fair value measurements. Fair value is defined under ASC 820 as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal market for the asset or liability in an orderly transaction between market participants on the measurement date. 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. This category includes the assets and liabilities related to our non-qualified deferred compensation plan where values are based on quoted market prices for identical equity securities in an active market. 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 2 assets include U.S. Treasuries, U.S. government and agency mortgage-backed debt securities, municipal bonds, and Community Reinvestment Act funds. This category also includes loans held for sale and derivative assets and liabilities where values are obtained from independent pricing services. 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. This category includes impaired loans and OREO where collateral values have been based on third party appraisals; comparative sales data typically used in appraisals may be unavailable or more subjective with respect to some asset classes due to lack of market activity. Assets and liabilities measured at fair value at March 31, 2017 and December 31, 2016 are as follows (in thousands): Fair Value Measurements Using March 31, 2017 Level 1 Level 2 Level 3 Available-for-sale securities:(1) U.S. Treasuries $ — $ 16,683 $ — Residential mortgage-backed securities — 14,376 — Equity securities(2) 4,004 7,140 — Loans held for sale (3) — 884,647 — Loans held for investment(4) (6) — — 50,780 OREO(5) (6) — — 18,833 Derivative assets(7) — 24,245 — Derivative liabilities(7) — 27,697 — Non-qualified deferred compensation plan liabilities (8) 4,040 — — December 31, 2016 Available-for-sale securities:(1) Residential mortgage-backed securities $ — $ 15,652 $ — Municipals — 275 — Equity securities(2) 1,786 7,161 — Loans held for sale(3) — 968,929 — Loans held for investment(4) (6) — — 52,323 OREO(5) (6) — — 18,961 Derivative assets(7) — 37,878 — Derivative liabilities(7) — 26,240 — Non-qualified deferred compensation plan liabilities (8) 1,811 — — (1) Securities are measured at fair value on a recurring basis, generally monthly. (2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. (3) Loans held for sale 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 corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly. Level 3 Valuations Financial instruments are considered Level 3 when their values are determined using pricing models, discounted cash flow methodologies or similar techniques and at least one significant model assumption or input is unobservable. Level 3 financial instruments include those for which the determination of fair value requires significant management judgment or estimation. Currently, we measure the fair value for certain loans and OREO on a nonrecurring basis as described below. Loans held for investment At March 31, 2017 and December 31, 2016 , certain impaired loans held for investment were reported at fair value through a specific allocation of the allowance for loan losses based upon the fair value of the underlying collateral. The $50.8 million fair value of loans held for investment at March 31, 2017 reported above includes impaired loans held for investment with a carrying value of $70.1 million that were reduced by specific allowance allocations totaling $19.3 million based on collateral valuations utilizing Level 3 valuation inputs. The $52.3 million fair value of loans held for investment at December 31, 2016 reported fair value above includes impaired loans with a carrying value of $74.1 million that were reduced by specific valuation allowance allocations totaling $21.8 million based on collateral valuations utilizing Level 3 valuation inputs. Fair values were based on third party appraisals. OREO Certain foreclosed assets, upon initial recognition, are recorded at fair value less estimated selling costs. At March 31, 2017 and December 31, 2016 , OREO had a carrying value of $18.8 million and $19.0 million , respectively, with no specific valuation allowance. The fair value of OREO was computed based on third party appraisals, which are Level 3 valuation 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 (in thousands): March 31, 2017 December 31, 2016 Carrying Amount Estimated Fair Value Carrying Estimated Financial assets: Level 1 inputs: Cash and cash equivalents $ 2,920,934 $ 2,920,934 $ 2,839,352 $ 2,839,352 Securities, available-for-sale 4,004 4,004 1,786 1,786 Level 2 inputs: Securities, available-for-sale 38,199 38,199 23,088 23,088 Loans held for sale 884,647 884,647 968,929 968,929 Derivative assets 24,245 24,245 37,878 37,878 Level 3 inputs: Loans held for investment, net 16,498,503 16,507,087 17,330,223 17,347,199 Financial liabilities: Level 2 inputs: Federal funds purchased 134,539 134,539 101,800 101,800 Customer repurchase agreements 7,295 7,295 7,775 7,775 Other borrowings 1,500,000 1,500,000 2,000,000 2,000,000 Subordinated notes 281,134 330,552 281,044 304,672 Derivative liabilities 27,697 27,697 26,240 26,240 Level 3 inputs: Deposits 16,605,380 16,604,650 17,016,831 17,017,221 Trust preferred subordinated debentures 113,406 113,406 113,406 113,406 The following methods and assumptions were used by the Company in estimating its fair value disclosures for financial instruments: Cash and cash equivalents The carrying amounts reported in the consolidated balance sheets for cash and cash equivalents approximate their fair value, and these financial instruments are characterized as Level 1 assets in the fair value hierarchy. Securities available-for-sale Within the securities available-for-sale portfolio, we hold equity securities related to our non-qualified deferred compensation plan which are valued using quoted market prices for identical equity securities in an active market. These financial instruments are classified as Level 1 assets in the fair value hierarchy. The fair value of the remaining investment portfolio is based on prices obtained from independent pricing services which are based on quoted market prices for the same or similar securities, and these financial instruments are characterized as Level 2 assets in the fair value hierarchy. We have obtained documentation from the primary pricing service we use about their processes and controls over pricing. In addition, on a quarterly basis we independently verify the prices that we receive from the service provider using two additional independent pricing sources. Any significant differences are investigated and resolved. Loans held for sale Fair value for loans held for sale is derived from quoted market prices for similar loans, and these financial instruments are characterized as Level 2 assets in the fair value hierarchy. Loans held for investment, net Loans held for investment are characterized as Level 3 assets in the fair value hierarchy. For variable-rate loans held for investment that reprice frequently with no significant change in credit risk, fair values are generally based on carrying values. The fair value for all other loans held for investment is estimated using discounted cash flow analyses, using interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. The carrying amount of accrued interest approximates its fair value. Derivatives The estimated fair value of the 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. Any significant differences are investigated and resolved. 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 the quoted market prices from brokers. As such, these loan purchase commitments and forward sales commitments are classified as Level 2 assets or liabilitites in the fair value hierarchy. Deposits Deposits are characterized as Level 3 liabilities in the fair value hierarchy. The carrying amounts for variable-rate money market accounts approximate their fair value.The fair values of fixed-term certificates of deposit are estimated using a discounted cash flow calculation that applies interest rates currently being offered on certificates to a schedule of aggregated expected monthly maturities. Federal funds purchased, customer repurchase agreements, other borrowings, subordinated notes and trust preferred subordinated debentures The carrying value reported in the consolidated balance sheets for Federal funds purchased, customer repurchase agreements and other short-term, floating rate borrowings approximates their fair value, and these financial instruments are characterized as Level 2 liabilities in the fair value hierarchy. The fair value of any fixed rate short-term borrowings and trust preferred subordinated debentures are estimated using a discounted cash flow calculation that applies interest rates currently being offered on similar borrowings, and these financial instruments are characterized as Level 3 liabilities in the fair value hierarchy. The subordinated notes are publicly, though infrequently, traded and are valued based on market prices, and are characterized as Level 2 liabilities in the fair value hierarchy.

DERIVATIVE FINANCIAL INSTRUMENT

DERIVATIVE FINANCIAL INSTRUMENTS	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVE FINANCIAL INSTRUMENTS	DERIVATIVE FINANCIAL INSTRUMENTS The fair value of derivative positions outstanding is included in accrued interest receivable and other assets and other liabilities in the accompanying consolidated balance sheets on a net basis when a right of offset exists, based on transactions with a single counterparty that are subject to a legally enforceable master netting agreement. During the three months ended March 31, 2017 and 2016 , we entered into certain interest rate derivative positions that were not designated as hedging instruments. These derivative positions relate to transactions in which we enter into an interest rate swap, cap and/or floor with a customer while at the same time entering into an offsetting interest rate swap, cap and/or floor with another financial institution. In connection with each swap transaction, we agree to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, we agree to pay another financial institution the same fixed interest rate on the same notional amount and receive the same variable interest rate on the same notional amount. The transaction allows our customer to effectively convert a variable rate loan to a fixed rate. Because we act as an intermediary for our customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on our results of operations. During the three months ended March 31, 2017 and 2016 , we entered into loan purchase commitment contracts with mortgage originators to purchase residential mortgage loans at a future date, as well as forward sales commitment contracts to sell residential mortgage loans at a future date. The notional amounts and estimated fair values of interest rate derivative positions outstanding at March 31, 2017 and December 31, 2016 are presented in the following tables (in thousands): March 31, 2017 December 31, 2016 Estimated Fair Value Estimated Fair Value Notional Amount Asset Derivative Liability Derivative Notional Amount Asset Derivative Liability Derivative Non-hedging interest rate derivatives: Financial institution counterparties: Commercial loan/lease interest rate swaps $ 1,256,666 $ 2,398 $ 22,489 $ 1,144,367 $ 1,754 $ 25,421 Commercial loan/lease interest rate caps 231,125 639 — 210,996 819 — Customer counterparties: Commercial loan/lease interest rate swaps 1,256,666 22,489 2,398 1,144,367 25,421 1,754 Commercial loan/lease interest rate caps 231,125 — 639 210,996 — 819 Economic hedging interest rate derivatives: Loan purchase commitments 222,492 1,117 — 237,805 1,351 — Forward sales commitments 1,030,393 — 4,569 1,218,000 10,287 — Gross derivatives 26,643 30,095 39,632 27,994 Offsetting derivative assets/liabilities (2,398 ) (2,398 ) (1,754 ) (1,754 ) Net derivatives included in the consolidated balance sheets $ 24,245 $ 27,697 $ 37,878 $ 26,240 The weighted average received and paid interest rates for interest rate swaps outstanding at March 31, 2017 and December 31, 2016 were as follows: March 31, 2017 December 31, 2016 Received Paid Received Paid Non-hedging interest rate swaps 3.40 % 4.61 % 3.17 % 4.58 % The weighted average strike rate for outstanding interest rate caps was 2.44% at March 31, 2017 and 2.45% at December 31, 2016 . Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In such cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceed a nominal amount considered to be immaterial . Our credit exposure, net of any collateral pledged, was approximately $24.2 million at March 31, 2017 and approximately $37.9 million at December 31, 2016 , which primarily relates to Bank customers. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap and cap values. At March 31, 2017 , we had $26.5 million in cash collateral pledged for these derivatives, of which $24.1 million was included in interest-bearing deposits and $2.4 million was included in accrued interest receivable and other assets. At December 31, 2016 , we had $24.8 million in cash collateral pledged for these derivatives, all of which was included in interest-bearing deposits.

NEW ACCOUNTING PRONOUNCEMENTS

NEW ACCOUNTING PRONOUNCEMENTS	3 Months Ended
	Mar. 31, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
NEW ACCOUNTING PRONOUNCEMENTS	NEW ACCOUNTING PRONOUNCEMENTS ASU 2016-15 "Statement of Cash Flows (Topic 230)" ("ASU 2016-15") is intended to reduce the diversity in practice around how certain transactions are classified within the statement of cash flows. ASU 2016-15 is effective for public companies for annual periods beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted with retrospective application. We are evaluating the impact adoption of ASU 2016-15 will have 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. ASU 2016-13 is effective for public companies for annual periods beginning after December 15, 2019, including interim periods within those fiscal years. 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. We are currently evaluating the impact adoption of ASU 2016-13 will have on our consolidated financial statements and disclosures. 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 is effective for public companies for annual periods beginning after December 15, 2018, including interim periods within those fiscal years. We have not yet selected a transition method as we are in the process of determining the effect of the standard on our consolidated financial statements and disclosures. ASU 2014-09 "Revenue from Contracts with Customers (Topic 606)" ("ASU 2014-09") implements a common revenue standard that clarifies the principles for recognizing revenue. The core principle of ASU 2014-09 is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 establishes a five-step model which entities must follow to recognize revenue and removes inconsistencies and weaknesses in existing guidance. ASU 2014-09 was originally effective for annual and interim periods beginning after December 15, 2016; however, the FASB issued ASU 2015-14 - "Revenue from Contracts with Customers (Topic 606) - Deferral of the Effective Date" which deferred the effective date of ASU 2014-09 by one year to annual and interim periods beginning after December 15, 2017. The guidance does not apply to revenue associated with financial instruments, including loans and securities that are accounted for under other GAAP, which comprises a significant portion of our revenue stream. Adoption of ASU 2014-09 may require us to amend how we recognize certain recurring revenue streams related to trust fees, which are recorded in non-interest income; however, we do not expect adoption of ASU 2014-09 to have a material impact on our consolidated financial statements and disclosures. We plan to adopt the revenue recognition guidance in the first quarter of 2018 with a cumulative effect adjustment to opening retained earnings, if management deems such adjustment significant. Our implementation efforts to date include identification of revenue streams within the scope of the guidance, and we have begun review of revenue contracts.

Summary of Significant Accounti

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2017
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 and national clientèle of commercial borrowers. We are primarily a secured lender, with our greatest concentration of loans in Texas.
Basis of Presentation	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. In that regard, ASU 2016-09, "Compensation - Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting," ("ASU 2016-09") became effective for us on January 1, 2017. ASU 2016-09 requires that excess tax benefits and deficiencies be recognized as a component of income taxes within the income statement. Additionally, ASU 2016-09 requires that all income tax-related cash flows resulting from share-based payments be reported as operating activities in the statement of cash flows. Previously, income tax benefits at award settlement were reported as a reduction to operating cash flows and an increase to financing cash flows to the extent that those benefits exceeded the income tax benefits reported in earnings during the award's vesting period. We have elected to apply that change in cash flow presentation on a prospective basis. ASU 2016-09 also requires that companies make an accounting policy election regarding forfeitures, to either estimate the number of awards that are expected to vest or account for them when they occur. We have elected to recognize forfeitures as they occur. The impact of this change and that of the remaining provisions of ASU 2016-09 did not have a significant impact on our financial statements. The consolidated interim financial statements have been prepared without audit. 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, 2016 , included in our Annual Report on Form 10-K filed with the SEC on February 17, 2017 (the “ 2016 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.
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 stock-based compensation awards, the fair values of financial instruments and the status of contingencies are particularly susceptible to significant change.

EARNINGS PER COMMON SHARE (Tabl

EARNINGS PER COMMON SHARE (Tables)	3 Months Ended
	Mar. 31, 2017
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 (in thousands except per share data): Three months ended 2017 2016 Numerator: Net income $ 42,542 $ 25,128 Preferred stock dividends 2,438 2,438 Net income available to common stockholders $ 40,104 22,690 Denominator: Denominator for basic earnings per share— weighted average shares 49,535,959 45,888,735 Effect of employee stock-based awards (1) 260,947 117,372 Effect of warrants to purchase common stock 437,324 348,271 Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions 50,234,230 46,354,378 Basic earnings per common share $ 0.81 $ 0.49 Diluted earnings per common share $ 0.80 $ 0.49 (1) SARs and RSUs outstanding of 3,000 at March 31, 2017 and 308,972 at March 31, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

SECURITIES (Tables)

SECURITIES (Tables)	3 Months Ended
	Mar. 31, 2017
Available-for-sale Securities [Abstract]
Schedule of summary of securities
Schedule of amortized cost and estimated fair value of securities	The amortized cost and estimated fair value of available-for-sale securities are presented below by contractual maturity (in thousands, except percentage data): March 31, 2017 Less Than One Year After One Through Five Years After Five Through Ten Years After Ten Years Total Available-for-sale: U.S. Treasuries: Amortized cost $ 16,688 $ — $ — $ — $ 16,688 Estimated fair value 16,683 — — — 16,683 Weighted average yield (3) 0.53 % — % — % — % 0.53 % Residential mortgage-backed securities: (1) Amortized cost 47 1,522 2,925 8,955 13,449 Estimated fair value 47 1,572 3,253 9,504 14,376 Weighted average yield (3) 5.25 % 4.69 % 5.55 % 2.85 % 3.65 % Equity securities: (4) Amortized cost 11,424 — — — 11,424 Estimated fair value 11,144 — — — 11,144 Total available-for-sale securities: Amortized cost $ 41,561 Estimated fair value $ 42,203 December 31, 2016 Less Than One Year After One Through Five Years After Five Through Ten Years After Ten Years Total Available-for-sale: Residential mortgage-backed securities: (1) Amortized cost $ 9 $ 2,047 $ 3,147 $ 9,477 $ 14,680 Estimated fair value 9 2,104 3,495 10,044 15,652 Weighted average yield (3) 5.50 % 4.70 % 5.55 % 2.84 % 3.68 % Municipals: (2) Amortized cost 275 — — — 275 Estimated fair value 275 — — — 275 Weighted average yield (3) 5.61 % — % — % — % 5.61 % Equity securities: (4) Amortized cost 9,280 — — — 9,280 Estimated fair value 8,947 — — — 8,947 Total available-for-sale securities: Amortized cost $ 24,235 Estimated fair value $ 24,874 (1) Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties. (2) Yields have been adjusted to a tax equivalent basis assuming a 35% federal tax rate. (3) Yields are calculated based on amortized cost. (4) These equity securities do not have a stated maturity.
Schedule of investment securities that have been in a continuous unrealized loss position for less or more than 12 months	The following table discloses, as of March 31, 2017 and December 31, 2016 , our investment securities 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 (in thousands): March 31, 2017 Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss U.S. Treasuries $ 16,683 $ (5 ) $ — $ — $ 16,683 $ (5 ) Equity securities 1,015 (6 ) 6,125 (375 ) 7,140 (381 ) $ 17,698 $ (11 ) $ 6,125 $ (375 ) $ 23,823 $ (386 ) December 31, 2016 Less Than 12 Months 12 Months or Longer Total Fair Value Unrealized Loss Fair Value Unrealized Loss Fair Value Unrealized Loss Equity securities $ 1,015 $ (6 ) $ 6,146 $ (354 ) $ 7,161 $ (360 )

LOANS AND ALLOWANCE FOR LOAN 23

LOANS AND ALLOWANCE FOR LOAN LOSSES (Tables)	3 Months Ended
	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of loans held for investments	At March 31, 2017 and December 31, 2016 , loans held for investment were as follows (in thousands): March 31, December 31, Commercial $ 7,480,485 $ 7,291,545 Mortgage finance 3,371,598 4,497,338 Construction 2,108,611 2,098,706 Real estate 3,563,136 3,462,203 Consumer 36,259 34,587 Leases 186,113 185,529 Gross loans held for investment 16,746,202 17,569,908 Deferred income (net of direct origination costs) (75,686 ) (71,559 ) Allowance for loan losses (172,013 ) (168,126 ) Total loans held for investment $ 16,498,503 $ 17,330,223
Schedule of the credit risk profile of loan portfolio by internally assigned grades and non-accrual status	The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Grade: Pass $ 7,161,580 $ 3,371,598 $ 2,106,255 $ 3,528,210 $ 35,554 $ 182,869 $ 16,386,066 Special mention 51,723 — 2,356 12,904 370 3,161 70,514 Substandard-accruing 125,095 — — 17,843 135 — 143,073 Non-accrual 142,087 — — 4,179 200 83 146,549 Total loans held for investment $ 7,480,485 $ 3,371,598 $ 2,108,611 $ 3,563,136 $ 36,259 $ 186,113 $ 16,746,202 December 31, 2016 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Grade: Pass $ 6,941,310 $ 4,497,338 $ 2,074,859 $ 3,430,346 $ 34,249 $ 181,914 $ 17,160,016 Special mention 69,447 — 10,901 21,932 — 3,532 105,812 Substandard-accruing 115,848 — 12,787 7,516 138 — 136,289 Non-accrual 164,940 — 159 2,409 200 83 167,791 Total loans held for investment $ 7,291,545 $ 4,497,338 $ 2,098,706 $ 3,462,203 $ 34,587 $ 185,529 $ 17,569,908
Schedule of activity in the reserve for loan losses by portfolio segment	The following table details activity in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 and 2016 . Allocation of a portion of the allowance to one category of loans does not preclude its availability to absorb losses in other categories. March 31, 2017 (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Leases Additional Qualitative Reserve Total Beginning balance $ 128,768 $ — $ 13,144 $ 19,149 $ 241 $ 1,124 $ 5,700 $ 168,126 Provision for loan losses 8,147 — (124 ) 3,270 (31 ) 325 (2,012 ) 9,575 Charge-offs 9,233 — — — — — — 9,233 Recoveries 3,381 — 101 50 5 8 — 3,545 Net charge-offs (recoveries) 5,852 — (101 ) (50 ) (5 ) (8 ) — 5,688 Ending balance $ 131,063 $ — $ 13,121 $ 22,469 $ 215 $ 1,457 $ 3,688 $ 172,013 Period end amount allocated to: Loans individually evaluated for impairment $ 34,595 $ — $ — $ 195 $ 30 $ 13 $ — $ 34,833 Loans collectively evaluated for impairment 96,468 — 13,121 22,274 185 1,444 3,688 137,180 Ending balance $ 131,063 $ — $ 13,121 $ 22,469 $ 215 $ 1,457 $ 3,688 $ 172,013 March 31, 2016 (in thousands) Commercial Mortgage Finance Construction Real Estate Consumer Leases Additional Qualitative Reserve Total Beginning balance $ 112,446 $ — $ 6,836 $ 13,381 $ 338 $ 3,931 $ 4,179 $ 141,111 Provision for loan losses 26,581 — 1,050 1,134 (15 ) (2,435 ) 2,480 28,795 Charge-offs 8,496 — — — — — — 8,496 Recoveries 1,040 — — 8 7 45 — 1,100 Net charge-offs (recoveries) 7,456 — — (8 ) (7 ) (45 ) — 7,396 Ending balance $ 131,571 $ — $ 7,886 $ 14,523 $ 330 $ 1,541 $ 6,659 $ 162,510 Period end amount allocated to: Loans individually evaluated for impairment $ 31,415 $ — $ — $ 1,183 $ — $ 51 $ — $ 32,649 Loans collectively evaluated for impairment 100,156 — 7,886 13,340 330 1,490 6,659 129,861 Ending balance $ 131,571 $ — $ 7,886 $ 14,523 $ 330 $ 1,541 $ 6,659 $ 162,510
Schedule of allowance for credit losses related to unfunded commitments	The table below presents the activity in the portion of the allowance for credit losses related to losses on unfunded commitments for the three months ended March 31, 2017 and 2016 (in thousands). This liability is recorded in other liabilities in the consolidated balance sheet. Three months ended March 31, 2017 2016 Beginning balance $ 11,422 $ 9,011 Provision for off-balance sheet credit losses (575 ) 1,205 Ending balance $ 10,847 $ 10,216
Schedule of recorded investment in loans related to each balance in the allowance for loan losses	Our recorded investment in loans as of March 31, 2017 , December 31, 2016 and March 31, 2016 related to each balance in the allowance for loan losses by portfolio segment and disaggregated on the basis of our impairment methodology was as follows (in thousands): March 31, 2017 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Loans individually evaluated for impairment $ 143,632 $ — $ — $ 5,512 $ 200 $ 83 $ 149,427 Loans collectively evaluated for impairment 7,336,853 3,371,598 2,108,611 3,557,624 36,059 186,030 16,596,775 Total $ 7,480,485 $ 3,371,598 $ 2,108,611 $ 3,563,136 $ 36,259 $ 186,113 $ 16,746,202 December 31, 2016 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Loans individually evaluated for impairment $ 166,669 $ — $ 159 $ 3,751 $ 200 $ 83 $ 170,862 Loans collectively evaluated for impairment 7,124,876 4,497,338 2,098,547 3,458,452 34,387 185,446 17,399,046 Total $ 7,291,545 $ 4,497,338 $ 2,098,706 $ 3,462,203 $ 34,587 $ 185,529 $ 17,569,908 March 31, 2016 Commercial Mortgage Finance Construction Real Estate Consumer Leases Total Loans individually evaluated for impairment $ 167,832 $ — $ — $ 8,397 $ — $ 343 $ 176,572 Loans collectively evaluated for impairment 6,721,967 4,981,304 1,958,370 3,128,584 26,439 104,117 16,920,781 Total $ 6,889,799 $ 4,981,304 $ 1,958,370 $ 3,136,981 $ 26,439 $ 104,460 $ 17,097,353
Schedule of impaired loans, by portfolio class	The following tables detail our impaired loans, by portfolio class, as of March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Business loans $ 25,149 $ 30,093 $ — $ 24,295 $ — Energy 39,050 39,306 — 44,185 — Construction Market risk — — — — — Real estate Market risk — — — — — Commercial 2,618 2,618 — 2,261 — Secured by 1-4 family — — — — — Consumer — — — — — Leases — — — — — Total impaired loans with no allowance recorded $ 66,817 $ 72,017 $ — $ 70,741 $ — With an allowance recorded: Commercial Business loans $ 26,146 $ 26,146 $ 8,378 $ 22,917 $ — Energy 53,287 71,555 26,217 67,592 6 Construction Market risk — — — 106 — Real estate Market risk 1,333 1,333 29 1,339 — Commercial — — — — — Secured by 1-4 family 1,561 1,561 166 738 — Consumer 200 200 30 200 — Leases 83 83 13 83 — Total impaired loans with an allowance recorded $ 82,610 $ 100,878 $ 34,833 $ 92,975 $ 6 Combined: Commercial Business loans $ 51,295 $ 56,239 $ 8,378 $ 47,212 $ — Energy 92,337 110,861 26,217 111,777 6 Construction Market risk — — — 106 — Real estate Market risk 1,333 1,333 29 1,339 — Commercial 2,618 2,618 — 2,261 — Secured by 1-4 family 1,561 1,561 166 738 — Consumer 200 200 30 200 — Leases 83 83 13 83 — Total impaired loans $ 149,427 $ 172,895 $ 34,833 $ 163,716 $ 6 December 31, 2016 Recorded Investment Unpaid Principal Balance Related Allowance Average Recorded Investment Interest Income Recognized With no related allowance recorded: Commercial Business loans $ 23,868 $ 27,992 $ — $ 12,361 $ — Energy 46,753 54,522 — 54,075 — Construction Market risk — — — 2,778 — Real estate Market risk — — — — — Commercial 2,083 2,083 — 4,483 38 Secured by 1-4 family — — — — — Consumer — — — — — Leases — — — 403 — Total impaired loans with no allowance recorded $ 72,704 $ 84,597 $ — $ 74,100 $ 38 With an allowance recorded: Commercial Business loans $ 21,303 $ 21,303 $ 7,055 $ 22,277 $ — Energy 74,745 88,987 27,350 73,637 24 Construction Market risk 159 159 24 53 — Real estate Market risk 1,342 1,342 20 3,000 — Commercial — — — — — Secured by 1-4 family 326 326 113 435 — Consumer 200 200 30 67 — Leases 83 83 13 548 — Total impaired loans with an allowance recorded $ 98,158 $ 112,400 $ 34,605 $ 100,017 $ 24 Combined: Commercial Business loans $ 45,171 $ 49,295 $ 7,055 $ 34,638 $ — Energy 121,498 143,509 27,350 127,712 24 Construction Market risk 159 159 24 2,831 — Real estate Market risk 1,342 1,342 20 3,000 — Commercial 2,083 2,083 — 4,483 38 Secured by 1-4 family 326 326 113 435 — Consumer 200 200 30 67 — Leases 83 83 13 951 — Total impaired loans $ 170,862 $ 196,997 $ 34,605 $ 174,117 $ 62
Schedule of an age analysis of accruing past due loans	The table below provides an age analysis of our loans held for investment as of March 31, 2017 (in thousands): 30-59 Days Past Due 60-89 Days Past Due Greater Than 90 Days and Accruing(1) Total Past Due Non-accrual Current Total Commercial Business loans $ 30,716 $ 6,923 $ 7,359 $ 44,998 $ 49,750 $ 6,484,545 $ 6,579,293 Energy — — — — 92,337 808,855 901,192 Mortgage finance loans — — — — — 3,371,598 3,371,598 Construction Market risk 2,553 — — 2,553 — 2,081,308 2,083,861 Secured by 1-4 family — — — — — 24,750 24,750 Real estate Market risk 112 — 1,333 1,445 — 2,652,833 2,654,278 Commercial — 274 — 274 2,618 689,414 692,306 Secured by 1-4 family 4,225 — 107 4,332 1,561 210,659 216,552 Consumer 360 98 — 458 200 35,601 36,259 Leases — — — — 83 186,030 186,113 Total loans held for investment $ 37,966 $ 7,295 $ 8,799 $ 54,060 $ 146,549 $ 16,545,593 $ 16,746,202 (1) Loans past due 90 days and still accruing includes premium finance loans of $5.1 million . These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. 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 summarizes, for the three months ended March 31, 2017 and 2016 , loans that were restructured during 2017 and 2016 (in thousands): March 31, 2017 Number of Restructured Loans Pre-Restructuring Outstanding Recorded Investment Post-Restructuring Outstanding Recorded Investment Energy loans 1 $ 1,070 $ 1,070 Commercial business loans 1 $ 599 $ 599 Total new restructured loans in 2017 2 $ 1,669 $ 1,669 March 31, 2016 Number of Restructured Loans Pre-Restructuring Outstanding Recorded Investment Post-Restructuring Outstanding Recorded Investment Energy loans 2 $ 14,235 $ 14,235 Total new restructured loans in 2016 2 $ 14,235 $ 14,235 The following table provides information on how restructured loans were modified during the three months ended March 31, 2017 and 2016 (in thousands): Three months ended March 31, 2017 2016 Extended maturity $ 1,070 $ — Adjusted payment schedule — 12,916 Combination of maturity extension and payment schedule adjustment — 1,319 Other 599 — Total $ 1,669 $ 14,235

OREO AND VALUATION ALLOWANCE 24

OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO (Tables)	3 Months Ended
	Mar. 31, 2017
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Schedule of the activity related to OREO	The table below presents a summary of the activity related to OREO (in thousands): Three months ended March 31, 2017 2016 Beginning balance $ 18,961 $ 278 Additions — 17,398 Sales (128 ) (91 ) Valuation allowance for OREO — — Direct write-downs — — Ending balance $ 18,833 $ 17,585 When foreclosure occurs, the acquired asset is recorded at fair value less selling costs, generally based on appraised value, which may result in partial charge-off of the loan. Subsequent write-downs required for declines in value are recorded through a valuation allowance or taken directly to the assets, charged to other non-interest expense. We did not record a valuation allowance during the three months ended March 31, 2017 and 2016 .

CERTAIN TRANSFERS OF FINANCIA25

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Tables)	3 Months Ended
	Mar. 31, 2017
Transfers and Servicing [Abstract]
Schedule of Loans Held for Sale	The table below presents a reconciliation of the changes in loans held for sale for the three months ended March 31, 2017 and 2016 (in thousands): Three months ended March 31, 2017 2016 Beginning balance $ 968,929 $ 86,075 Loans purchased 1,299,542 364,919 Payments and loans sold (1,399,800 ) (357,018 ) Change in fair value 15,976 726 Ending balance $ 884,647 $ 94,702 The table below presents the unpaid principal balance of loans held for sale and related fair values at March 31, 2017 and December 31, 2016 (in thousands): March 31, 2017 December 31, 2016 Unpaid principal balance $ 880,156 $ 980,414 Fair value 884,647 968,929 Fair value over/(under) unpaid principal balance $ 4,491 $ (11,485 )
Servicing Asset at Amortized Cost	We generally retain the right to service the loans sold, creating mortgage servicing rights ("MSRs") which are recorded as assets on our balance sheet. A summary of MSR activity for the three months ended March 31, 2017 and 2016 is as follows (in thousands): Three months ended March 31, 2017 2016 Servicing asset: Balance, beginning of year(1) $ 28,536 $ 423 Capitalized servicing rights 18,094 3,903 Amortization (1,104 ) (40 ) Balance, end of period $ 45,526 $ 4,286 Valuation allowance: Balance, beginning of year $ — $ — Increase in valuation allowance — 33 Balance, end of period $ — $ 33 Servicing asset, net(1) $ 45,526 $ 4,253 Fair value $ 48,013 $ 4,253
Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities	March 31, 2017 and December 31, 2016 , management used the following assumptions to determine the fair value of MSRs: March 31, 2017 December 31, 2016 Average discount rates 9.91 % 9.96 % Expected prepayment speeds 8.10 % 7.91 % Weighted average life, in years 7.9 8.0
Schedule of Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets	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): March 31, 2017 December 31, 2016 50 bp adverse change in prepayment speed $ (4,471 ) $ (2,833 ) 100 bp adverse change in prepayment speed (10,835 ) (6,812 )

FINANCIAL INSTRUMENTS WITH OF26

FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Tables)	3 Months Ended
	Mar. 31, 2017
Risks and Uncertainties [Abstract]
Schedule of financial instruments with off-balance sheet risk	The table below summarizes our off-balance sheet financial instruments whose contract amounts represented credit risk (in thousands): March 31, 2017 December 31, 2016 Commitments to extend credit $ 5,829,713 $ 5,704,381 Standby letters of credit 171,451 171,266

REGULATORY MATTERS (Tables)

REGULATORY MATTERS (Tables)	3 Months Ended
	Mar. 31, 2017
Regulatory Capital Requirements [Abstract]
Schedule of capital ratios	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 Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio Capital Amount Ratio As of March 31, 2017: CET1 Company $ 1,881,329 9.61 % $ 1,125,456 5.75 % $ 1,370,121 7.00 % N/A N/A Bank 1,778,152 9.09 % 1,125,405 5.75 % 1,370,058 7.00 % 1,272,197 6.50 % Total capital (to risk-weighted assets) Company 2,603,536 13.30 % 1,810,516 9.25 % 2,055,181 10.50 % N/A N/A Bank 2,341,922 11.97 % 1,810,434 9.25 % 2,055,088 10.50 % 1,957,226 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,139,542 10.93 % 1,419,053 7.25 % 1,663,718 8.50 % N/A N/A Bank 1,936,365 9.89 % 1,418,989 7.25 % 1,663,642 8.50 % 1,565,781 8.00 % Tier 1 capital (to average assets)(1) Company 2,139,542 10.27 % 833,706 4.00 % 833,706 4.00 % N/A N/A Bank 1,936,365 9.29 % 833,510 4.00 % 833,510 4.00 % 1,041,888 5.00 % As of December 31, 2016: CET1 Company $ 1,841,219 8.97 % $ 1,052,205 5.125 % $ 1,437,159 7.00 % N/A N/A Bank 1,735,496 8.45 % 1,051,989 5.125 % 1,436,863 7.00 % 1,334,244 6.50 % Total capital (to risk-weighted assets) Company 2,561,663 12.48 % 1,770,766 8.625 % 2,155,715 10.50 % N/A N/A Bank 2,297,528 11.19 % 1,770,421 8.625 % 2,155,295 10.50 % 2,052,683 10.00 % Tier 1 capital (to risk-weighted assets) Company 2,101,071 10.23 % 1,360,154 6.625 % 1,745,103 8.50 % N/A N/A Bank 1,895,348 9.23 % 1,359,888 6.625 % 1,744,762 8.50 % 1,642,147 8.00 % Tier 1 capital (to average assets)(1) Company 2,101,071 9.34 % 900,268 4.00 % 900,268 4.00 % N/A N/A Bank 1,895,348 8.42 % 900,070 4.00 % 900,070 4.00 % 1,125,087 5.00 % (1) The Tier 1 capital ratio (to average assets) is not impacted by the Basel III Capital Rules; however, it should be noted that 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)	3 Months Ended
	Mar. 31, 2017
Compensation Related Costs [Abstract]
Schedule of stock-based compensation costs	Stock-based compensation expense presented below consists of awards granted from 2011 through March 31, 2017 . Three months ended March 31, (in thousands) 2017 2016 Stock-settled awards: SARs $ 72 $ 82 RSUs 1,593 1,048 Restricted stock 4 2 Cash-settled performance units 2,890 (673 ) Total $ 4,559 $ 459
Schedule of unrecognized compensation costs	(in thousands) March 31, 2017 Unrecognized compensation expense related to unvested stock-settled awards $ 20,117 Weighted average period over which expense is expected to be recognized, in years 3.2

FAIR VALUE DISCLOSURES (Tables)

FAIR VALUE DISCLOSURES (Tables)	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value	Assets and liabilities measured at fair value at March 31, 2017 and December 31, 2016 are as follows (in thousands): Fair Value Measurements Using March 31, 2017 Level 1 Level 2 Level 3 Available-for-sale securities:(1) U.S. Treasuries $ — $ 16,683 $ — Residential mortgage-backed securities — 14,376 — Equity securities(2) 4,004 7,140 — Loans held for sale (3) — 884,647 — Loans held for investment(4) (6) — — 50,780 OREO(5) (6) — — 18,833 Derivative assets(7) — 24,245 — Derivative liabilities(7) — 27,697 — Non-qualified deferred compensation plan liabilities (8) 4,040 — — December 31, 2016 Available-for-sale securities:(1) Residential mortgage-backed securities $ — $ 15,652 $ — Municipals — 275 — Equity securities(2) 1,786 7,161 — Loans held for sale(3) — 968,929 — Loans held for investment(4) (6) — — 52,323 OREO(5) (6) — — 18,961 Derivative assets(7) — 37,878 — Derivative liabilities(7) — 26,240 — Non-qualified deferred compensation plan liabilities (8) 1,811 — — (1) Securities are measured at fair value on a recurring basis, generally monthly. (2) Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan. (3) Loans held for sale 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 corresponds to the fair value of the invested assets, and are measured at fair value on a recurring basis, generally monthly.
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 (in thousands): March 31, 2017 December 31, 2016 Carrying Amount Estimated Fair Value Carrying Estimated Financial assets: Level 1 inputs: Cash and cash equivalents $ 2,920,934 $ 2,920,934 $ 2,839,352 $ 2,839,352 Securities, available-for-sale 4,004 4,004 1,786 1,786 Level 2 inputs: Securities, available-for-sale 38,199 38,199 23,088 23,088 Loans held for sale 884,647 884,647 968,929 968,929 Derivative assets 24,245 24,245 37,878 37,878 Level 3 inputs: Loans held for investment, net 16,498,503 16,507,087 17,330,223 17,347,199 Financial liabilities: Level 2 inputs: Federal funds purchased 134,539 134,539 101,800 101,800 Customer repurchase agreements 7,295 7,295 7,775 7,775 Other borrowings 1,500,000 1,500,000 2,000,000 2,000,000 Subordinated notes 281,134 330,552 281,044 304,672 Derivative liabilities 27,697 27,697 26,240 26,240 Level 3 inputs: Deposits 16,605,380 16,604,650 17,016,831 17,017,221 Trust preferred subordinated debentures 113,406 113,406 113,406 113,406

DERIVATIVE FINANCIAL INSTRUME30

DERIVATIVE FINANCIAL INSTRUMENTS (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of notional amounts and estimated fair values of interest rate derivative positions	The notional amounts and estimated fair values of interest rate derivative positions outstanding at March 31, 2017 and December 31, 2016 are presented in the following tables (in thousands): March 31, 2017 December 31, 2016 Estimated Fair Value Estimated Fair Value Notional Amount Asset Derivative Liability Derivative Notional Amount Asset Derivative Liability Derivative Non-hedging interest rate derivatives: Financial institution counterparties: Commercial loan/lease interest rate swaps $ 1,256,666 $ 2,398 $ 22,489 $ 1,144,367 $ 1,754 $ 25,421 Commercial loan/lease interest rate caps 231,125 639 — 210,996 819 — Customer counterparties: Commercial loan/lease interest rate swaps 1,256,666 22,489 2,398 1,144,367 25,421 1,754 Commercial loan/lease interest rate caps 231,125 — 639 210,996 — 819 Economic hedging interest rate derivatives: Loan purchase commitments 222,492 1,117 — 237,805 1,351 — Forward sales commitments 1,030,393 — 4,569 1,218,000 10,287 — Gross derivatives 26,643 30,095 39,632 27,994 Offsetting derivative assets/liabilities (2,398 ) (2,398 ) (1,754 ) (1,754 ) Net derivatives included in the consolidated balance sheets $ 24,245 $ 27,697 $ 37,878 $ 26,240
Schedule of the weighted-average receive and pay interest rate swaps	The weighted average received and paid interest rates for interest rate swaps outstanding at March 31, 2017 and December 31, 2016 were as follows: March 31, 2017 December 31, 2016 Received Paid Received Paid Non-hedging interest rate swaps 3.40 % 4.61 % 3.17 % 4.58 %

EARNINGS PER COMMON SHARE (Deta

EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Numerator:
Net income		$ 42,542	$ 25,128
Preferred stock dividends		(2,438)	(2,438)
Net income available to common stockholders		$ 40,104	$ 22,690
Denominator:
Denominator for basic earnings per share— weighted average shares		49,535,959	45,888,735
Effect of employee stock-based awards	[1]	260,947	117,372
Effect of warrants to purchase common stock		437,324	348,271
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions		50,234,230	46,354,378
Basic earnings per common share (usd per share)		$ 0.81	$ 0.49
Diluted earnings per common share (usd per share)		$ 0.80	$ 0.49
Stock options, SARs and RSUs excluded from computation of diluted EPS		3,000	308,972
[1]	SARs and RSUs outstanding of 3,000 at March 31, 2017 and 308,972 at March 31, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

SECURITIES (Details)

SECURITIES (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Summary of Available-for-Sale Securities
Amortized Cost		$ 41,561	$ 24,235
Gross Unrealized Gains		1,028	999
Gross Unrealized Losses		(386)	(360)
Estimated Fair Value		42,203	24,874
U.S. Treasuries
Summary of Available-for-Sale Securities
Amortized Cost		16,688
Gross Unrealized Gains		0
Gross Unrealized Losses		(5)
Estimated Fair Value		16,683
Residential mortgage-backed securities
Summary of Available-for-Sale Securities
Amortized Cost	[1]	13,449	14,680
Gross Unrealized Gains		927	972
Gross Unrealized Losses		0	0
Estimated Fair Value	[1]	14,376	15,652
Municipals
Summary of Available-for-Sale Securities
Amortized Cost	[2]		275
Gross Unrealized Gains			0
Gross Unrealized Losses			0
Estimated Fair Value	[2]		275
Equity securities
Summary of Available-for-Sale Securities
Amortized Cost	[3],[4]	11,424	9,280
Gross Unrealized Gains	[3]	101	27
Gross Unrealized Losses	[3]	(381)	(360)
Estimated Fair Value	[3],[4]	$ 11,144	$ 8,947
[1]	Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.
[2]	Yields have been adjusted to a tax equivalent basis assuming a 35% federal tax rate.
[3]	Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.
[4]	These equity securities do not have a stated maturity.

SECURITIES (Details 1)

SECURITIES (Details 1) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
		Mar. 31, 2017	Dec. 31, 2016
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Total		$ 41,561	$ 24,235
Estimated Fair Value		$ 42,203	$ 24,874
Available-for-sale Securities, Other Disclosure Items
Federal tax rate		35.00%	35.00%
U.S. Treasuries
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Less Than One Year		$ 16,688
Amortized cost, After One Through Five Years		0
Amortized cost, After Five Through Ten Years		0
Amortized cost, After Ten Years		0
Amortized cost, Total		16,688
Estimated fair value, Less Than One Year		16,683
Estimated fair value, After One Through Five Years		0
Estimated fair value, After Five Through Ten Years		0
Estimated fair value, After Ten Years		0
Estimated Fair Value		$ 16,683
Weighted average yield, Less Than One Year		0.53%
Weighted average yield, After One Through Five Years		0.00%
Weighted average yield, After Five Through Ten Years		0.00%
Weighted average yield, After Ten Years		0.00%
Weighted average yield, Total		0.53%
Residential mortgage-backed securities
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Less Than One Year	[1]	$ 47	$ 9
Amortized cost, After One Through Five Years	[1]	1,522	2,047
Amortized cost, After Five Through Ten Years	[1]	2,925	3,147
Amortized cost, After Ten Years	[1]	8,955	9,477
Amortized cost, Total	[1]	13,449	14,680
Estimated fair value, Less Than One Year	[1]	47	9
Estimated fair value, After One Through Five Years	[1]	1,572	2,104
Estimated fair value, After Five Through Ten Years	[1]	3,253	3,495
Estimated fair value, After Ten Years	[1]	9,504	10,044
Estimated Fair Value	[1]	$ 14,376	$ 15,652
Weighted average yield, Less Than One Year	[1],[2]	5.25%	5.50%
Weighted average yield, After One Through Five Years	[1],[2]	4.69%	4.70%
Weighted average yield, After Five Through Ten Years	[1],[2]	5.55%	5.55%
Weighted average yield, After Ten Years	[1],[2]	2.85%	2.84%
Weighted average yield, Total	[1],[2]	3.65%	3.68%
Municipals
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Less Than One Year	[3]		$ 275
Amortized cost, After One Through Five Years	[3]		0
Amortized cost, After Five Through Ten Years	[3]		0
Amortized cost, After Ten Years	[3]		0
Amortized cost, Total	[3]		275
Estimated fair value, Less Than One Year	[3]		275
Estimated fair value, After One Through Five Years	[3]		0
Estimated fair value, After Five Through Ten Years	[3]		0
Estimated fair value, After Ten Years	[3]		0
Estimated Fair Value	[3]		$ 275
Weighted average yield, Less Than One Year	[2],[3]		5.61%
Weighted average yield, After One Through Five Years	[2],[3]		0.00%
Weighted average yield, After Five Through Ten Years	[2],[3]		0.00%
Weighted average yield, After Ten Years	[2],[3]		0.00%
Weighted average yield, Total	[2],[3]		5.61%
Equity securities
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Less Than One Year	[4]	$ 11,424	$ 9,280
Amortized cost, After One Through Five Years	[4]	0	0
Amortized cost, After Five Through Ten Years	[4]	0	0
Amortized cost, After Ten Years	[4]	0	0
Amortized cost, Total	[4],[5]	11,424	9,280
Estimated fair value, Less Than One Year	[4]	11,144	8,947
Estimated fair value, After One Through Five Years	[4]	0	0
Estimated fair value, After Five Through Ten Years	[4]	0	0
Estimated fair value, After Ten Years	[4]	0	0
Estimated Fair Value	[4],[5]	11,144	$ 8,947
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale securities pledged as collateral		3,600
Repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale securities pledged as collateral		$ 9,400
[1]	Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.
[2]	Yields are calculated based on amortized cost.
[3]	Yields have been adjusted to a tax equivalent basis assuming a 35% federal tax rate.
[4]	These equity securities do not have a stated maturity.
[5]	Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.

SECURITIES (Details 2)

SECURITIES (Details 2) $ in Thousands	Mar. 31, 2017USD ($)security	Dec. 31, 2016USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (security) | security	5
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair Value, Less Than 12 Months	$ 17,698
Unrealized Loss, Less Than 12 Months	(11)
Fair Value, 12 Months or Longer	6,125
Unrealized Loss, 12 Months or Longer	(375)
Fair Value, Total	23,823
Unrealized Loss, Total	$ (386)
U.S. Treasuries
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (security) | security	3
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair Value, Less Than 12 Months	$ 16,683
Unrealized Loss, Less Than 12 Months	(5)
Fair Value, 12 Months or Longer	0
Unrealized Loss, 12 Months or Longer	0
Fair Value, Total	16,683
Unrealized Loss, Total	$ (5)
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (security) | security	2
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair Value, Less Than 12 Months	$ 1,015	$ 1,015
Unrealized Loss, Less Than 12 Months	(6)	(6)
Fair Value, 12 Months or Longer	6,125	6,146
Unrealized Loss, 12 Months or Longer	(375)	(354)
Fair Value, Total	7,140	7,161
Unrealized Loss, Total	$ (381)	$ (360)

LOANS AND ALLOWANCE FOR LOAN 35

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Net Reported Amount
Commercial	$ 7,480,485	$ 7,291,545
Mortgage finance	3,371,598	4,497,338
Construction	2,108,611	2,098,706
Real estate	3,563,136	3,462,203
Consumer	36,259	34,587
Leases	186,113	185,529
Gross loans held for investment	16,746,202	17,569,908	$ 17,097,353
Deferred income (net of direct origination costs)	(75,686)	(71,559)
Allowance for loan losses	(172,013)	(168,126)	$ (162,510)	$ (141,111)
Loans held for investment, net	16,498,503	17,330,223
Participating mortgage finance loans	$ 230,500	$ 839,000

LOANS AND ALLOWANCE FOR LOAN 36

LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Risk Profile (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Commercial	$ 7,480,485	$ 7,291,545
Mortgage finance	3,371,598	4,497,338
Construction	2,108,611	2,098,706
Real estate	3,563,136	3,462,203
Consumer	36,259	34,587
Leases	186,113	185,529
Gross loans held for investment	16,746,202	17,569,908	$ 17,097,353
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial	7,161,580	6,941,310
Mortgage finance	3,371,598	4,497,338
Construction	2,106,255	2,074,859
Real estate	3,528,210	3,430,346
Consumer	35,554	34,249
Leases	182,869	181,914
Gross loans held for investment	16,386,066	17,160,016
Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	51,723	69,447
Mortgage finance	0	0
Construction	2,356	10,901
Real estate	12,904	21,932
Consumer	370	0
Leases	3,161	3,532
Gross loans held for investment	70,514	105,812
Substandard-accruing
Financing Receivable, Recorded Investment [Line Items]
Commercial	125,095	115,848
Mortgage finance	0	0
Construction	0	12,787
Real estate	17,843	7,516
Consumer	135	138
Leases	0	0
Gross loans held for investment	143,073	136,289
Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Commercial	142,087	164,940
Mortgage finance	0	0
Construction	0	159
Real estate	4,179	2,409
Consumer	200	200
Leases	83	83
Gross loans held for investment	$ 146,549	$ 167,791

LOANS AND ALLOWANCE FOR LOAN 37

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Reserve for loan losses:
Beginning balance	$ 168,126	$ 141,111
Provision for loan losses	9,575	28,795
Charge-offs	9,233	8,496
Recoveries	3,545	1,100
Net charge-offs (recoveries)	5,688	7,396
Period end amount allocated to:
Loans individually evaluated for impairment			$ 34,833	$ 32,649
Loans collectively evaluated for impairment			137,180	129,861
Ending balance	168,126	141,111	172,013	162,510
Commercial
Reserve for loan losses:
Beginning balance	128,768	112,446
Provision for loan losses	8,147	26,581
Charge-offs	9,233	8,496
Recoveries	3,381	1,040
Net charge-offs (recoveries)	5,852	7,456
Period end amount allocated to:
Loans individually evaluated for impairment			34,595	31,415
Loans collectively evaluated for impairment			96,468	100,156
Ending balance	128,768	112,446	131,063	131,571
Mortgage finance loans
Reserve for loan losses:
Beginning balance	0	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Period end amount allocated to:
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			0	0
Ending balance	0	0	0	0
Construction
Reserve for loan losses:
Beginning balance	13,144	6,836
Provision for loan losses	(124)	1,050
Charge-offs	0	0
Recoveries	101	0
Net charge-offs (recoveries)	(101)	0
Period end amount allocated to:
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			13,121	7,886
Ending balance	13,144	6,836	13,121	7,886
Real Estate
Reserve for loan losses:
Beginning balance	19,149	13,381
Provision for loan losses	3,270	1,134
Charge-offs	0	0
Recoveries	50	8
Net charge-offs (recoveries)	(50)	(8)
Period end amount allocated to:
Loans individually evaluated for impairment			195	1,183
Loans collectively evaluated for impairment			22,274	13,340
Ending balance	19,149	13,381	22,469	14,523
Consumer
Reserve for loan losses:
Beginning balance	241	338
Provision for loan losses	(31)	(15)
Charge-offs	0	0
Recoveries	5	7
Net charge-offs (recoveries)	(5)	(7)
Period end amount allocated to:
Loans individually evaluated for impairment			30	0
Loans collectively evaluated for impairment			185	330
Ending balance	241	338	215	330
Leases
Reserve for loan losses:
Beginning balance	1,124	3,931
Provision for loan losses	325	(2,435)
Charge-offs	0	0
Recoveries	8	45
Net charge-offs (recoveries)	(8)	(45)
Period end amount allocated to:
Loans individually evaluated for impairment			13	51
Loans collectively evaluated for impairment			1,444	1,490
Ending balance	1,124	3,931	1,457	1,541
Unallocated
Reserve for loan losses:
Beginning balance	5,700	4,179
Provision for loan losses	(2,012)	2,480
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Period end amount allocated to:
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			3,688	6,659
Ending balance	$ 5,700	$ 4,179	$ 3,688	$ 6,659

LOANS AND ALLOWANCE FOR LOAN 38

LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Credit Losses Related to Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for off-balance sheet credit losses	$ 9,000	$ 30,000
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	11,422	9,011
Provision for off-balance sheet credit losses	(575)	1,205
Ending balance	$ 10,847	$ 10,216

LOANS AND ALLOWANCE FOR LOAN 39

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	$ 149,427	$ 170,862	$ 176,572
Loans collectively evaluated for impairment	16,596,775	17,399,046	16,920,781
Gross loans held for investment	16,746,202	17,569,908	17,097,353
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	143,632	166,669	167,832
Loans collectively evaluated for impairment	7,336,853	7,124,876	6,721,967
Gross loans held for investment	7,480,485	7,291,545	6,889,799
Mortgage finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	0	0
Loans collectively evaluated for impairment	3,371,598	4,497,338	4,981,304
Gross loans held for investment	3,371,598	4,497,338	4,981,304
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	159	0
Loans collectively evaluated for impairment	2,108,611	2,098,547	1,958,370
Gross loans held for investment	2,108,611	2,098,706	1,958,370
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	5,512	3,751	8,397
Loans collectively evaluated for impairment	3,557,624	3,458,452	3,128,584
Gross loans held for investment	3,563,136	3,462,203	3,136,981
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	200	200	0
Loans collectively evaluated for impairment	36,059	34,387	26,439
Gross loans held for investment	36,259	34,587	26,439
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	83	83	343
Loans collectively evaluated for impairment	186,030	185,446	104,117
Gross loans held for investment	$ 186,113	$ 185,529	$ 104,460

LOANS AND ALLOWANCE FOR LOAN 40

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Non-accrual loans earning on a cash basis	$ 0	$ 811

LOANS AND ALLOWANCE FOR LOAN 41

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment			$ 46,753
With no related allowance recorded:
Financing Receivable, Impaired [Line Items]
Recorded investment	$ 66,817		72,704
Unpaid principal balance	72,017		84,597
Related allowance	0		0
Average recorded investment	70,741		74,100
Interest income recognized	0		38
With no related allowance recorded: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	25,149		23,868
Unpaid principal balance	30,093		27,992
Related allowance	0		0
Average recorded investment	24,295		12,361
Interest income recognized	0		0
With no related allowance recorded: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	39,050
Unpaid principal balance	39,306		54,522
Related allowance	0		0
Average recorded investment	44,185		54,075
Interest income recognized	0		0
With no related allowance recorded: | Construction | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		2,778
Interest income recognized	0		0
With no related allowance recorded: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With no related allowance recorded: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,618		2,083
Unpaid principal balance	2,618		2,083
Related allowance	0		0
Average recorded investment	2,261		4,483
Interest income recognized	0		38
With no related allowance recorded: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With no related allowance recorded: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With no related allowance recorded: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		403
Interest income recognized	0		0
With an allowance recorded:
Financing Receivable, Impaired [Line Items]
Recorded investment	82,610		98,158
Unpaid principal balance	100,878		112,400
Related allowance	34,833		34,605
Average recorded investment	92,975		100,017
Interest income recognized	6		24
With an allowance recorded: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	26,146		21,303
Unpaid principal balance	26,146		21,303
Related allowance	8,378		7,055
Average recorded investment	22,917		22,277
Interest income recognized	0		0
With an allowance recorded: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	53,287		74,745
Unpaid principal balance	71,555		88,987
Related allowance	26,217		27,350
Average recorded investment	67,592		73,637
Interest income recognized	6		24
With an allowance recorded: | Construction | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		159
Unpaid principal balance	0		159
Related allowance	0		24
Average recorded investment	106		53
Interest income recognized	0		0
With an allowance recorded: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	1,333		1,342
Unpaid principal balance	1,333		1,342
Related allowance	29		20
Average recorded investment	1,339		3,000
Interest income recognized	0		0
With an allowance recorded: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	0		0
Unpaid principal balance	0		0
Related allowance	0		0
Average recorded investment	0		0
Interest income recognized	0		0
With an allowance recorded: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	1,561		326
Unpaid principal balance	1,561		326
Related allowance	166		113
Average recorded investment	738		435
Interest income recognized	0		0
With an allowance recorded: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	200		200
Unpaid principal balance	200		200
Related allowance	30		30
Average recorded investment	200		67
Interest income recognized	0		0
With an allowance recorded: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	83		83
Unpaid principal balance	83		83
Related allowance	13		13
Average recorded investment	83		548
Interest income recognized	0		0
Combined:
Financing Receivable, Impaired [Line Items]
Recorded investment	149,427		170,862
Unpaid principal balance	172,895		196,997
Related allowance	34,833		34,605
Average recorded investment	163,716	$ 181,100	174,117
Interest income recognized	6		62
Combined: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	51,295		45,171
Unpaid principal balance	56,239		49,295
Related allowance	8,378		7,055
Average recorded investment	47,212		34,638
Interest income recognized	0		0
Combined: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	92,337		121,498
Unpaid principal balance	110,861		143,509
Related allowance	26,217		27,350
Average recorded investment	111,777		127,712
Interest income recognized	6		24
Combined: | Construction | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	0		159
Unpaid principal balance	0		159
Related allowance	0		24
Average recorded investment	106		2,831
Interest income recognized	0		0
Combined: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	1,333		1,342
Unpaid principal balance	1,333		1,342
Related allowance	29		20
Average recorded investment	1,339		3,000
Interest income recognized	0		0
Combined: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,618		2,083
Unpaid principal balance	2,618		2,083
Related allowance	0		0
Average recorded investment	2,261		4,483
Interest income recognized	0		38
Combined: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	1,561		326
Unpaid principal balance	1,561		326
Related allowance	166		113
Average recorded investment	738		435
Interest income recognized	0		0
Combined: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	200		200
Unpaid principal balance	200		200
Related allowance	30		30
Average recorded investment	200		67
Interest income recognized	0		0
Combined: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	83		83
Unpaid principal balance	83		83
Related allowance	13		13
Average recorded investment	83		951
Interest income recognized	$ 0		$ 0

LOANS AND ALLOWANCE FOR LOAN 42

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 6) $ in Thousands	Mar. 31, 2017USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 54,060
Non-accrual	146,549
Current	16,545,593
Total	16,746,202
Premium finance loans past due 90 days and still accruing	5,100
Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	44,998
Non-accrual	49,750
Current	6,484,545
Total	6,579,293
Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	92,337
Current	808,855
Total	901,192
Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	3,371,598
Total	3,371,598
Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,553
Non-accrual	0
Current	2,081,308
Total	2,083,861
Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	24,750
Total	24,750
Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,445
Non-accrual	0
Current	2,652,833
Total	2,654,278
Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,332
Non-accrual	1,561
Current	210,659
Total	216,552
Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	274
Non-accrual	2,618
Current	689,414
Total	692,306
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	458
Non-accrual	200
Current	35,601
Total	36,259
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	83
Current	186,030
Total	186,113
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	37,966
30-59 Days Past Due | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	30,716
30-59 Days Past Due | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	2,553
30-59 Days Past Due | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	112
30-59 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	4,225
30-59 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	360
30-59 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,295
60-89 Days Past Due | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,923
60-89 Days Past Due | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
60-89 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	274
60-89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	98
60-89 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Greater Than 90 Days and Accruing(1)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	8,799	[1]
Greater Than 90 Days and Accruing(1) | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	7,359	[1]
Greater Than 90 Days and Accruing(1) | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,333	[1]
Greater Than 90 Days and Accruing(1) | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	107	[1]
Greater Than 90 Days and Accruing(1) | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0	[1]
Greater Than 90 Days and Accruing(1) | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 0	[1]
[1]	Loans past due 90 days and still accruing includes premium finance loans of $5.1 million. These loans are generally secured by obligations of insurance carriers to refund premiums on canceled insurance policies. The refund of premiums from the insurance carriers can take 180 days or longer from the cancellation date.

LOANS AND ALLOWANCE FOR LOAN 43

LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 7) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Financing Receivable, Modifications [Line Items]
Non-accrual loans that met the criteria for restructured unfunded commitments	$ 18,500		$ 18,100
Number of restructured loans	2	2
Pre-restructuring outstanding recorded investment	$ 1,669	$ 14,235
Post-restructuring outstanding recorded investment	$ 1,669	$ 14,235
Energy loans
Financing Receivable, Modifications [Line Items]
Number of restructured loans	1	2
Pre-restructuring outstanding recorded investment	$ 1,070	$ 14,235
Post-restructuring outstanding recorded investment	$ 1,070	$ 14,235
Commercial business loans
Financing Receivable, Modifications [Line Items]
Number of restructured loans	1
Pre-restructuring outstanding recorded investment	$ 599
Post-restructuring outstanding recorded investment	$ 599

LOANS AND ALLOWANCE FOR LOAN 44

LOANS AND ALLOWANCE FOR LOAN LOSSES - TDR Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	$ 1,669	$ 14,235
Extended maturity
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	1,070	0
Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	0	12,916
Combination of maturity extension and payment schedule adjustment
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	0	1,319
Other
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	$ 599	$ 0

OREO AND VALUATION ALLOWANCE 45

OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	$ 18,961	[1],[2]	$ 278
Additions	0		17,398
Sales	(128)		(91)
Valuation allowance for OREO	0		0
Direct write-downs	0		0
Ending balance	$ 18,833	[1],[2]	$ 17,585
[1]	Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.
[2]	OREO is transferred from loans to OREO at fair value less selling costs.

CERTAIN TRANSFERS OF FINANCIA46

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details) $ in Thousands	Mar. 31, 2017USD ($)loan	Dec. 31, 2016USD ($)loan	Mar. 31, 2016USD ($)
Transfers and Servicing [Abstract]
Number of loans in servicing portfolio | loan	13,955	8,618
Outstanding principal balance of loans in servicing portfolio Financial Assets, Principal Amount Outstanding	$ 3,549,400	$ 2,200,000
Escrow fund deposits related to servicing assets	31,400	$ 21,000
Estimated exposure related to servicing assets	$ 971		$ 178

CERTAIN TRANSFERS OF FINANCIA47

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 1) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Unpaid principal balance	$ 880,156	$ 980,414
Fair value	884,647	968,929
Fair value over/(under) unpaid principal balance	$ 4,491	$ (11,485)

CERTAIN TRANSFERS OF FINANCIA48

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Beginning balance	$ 968,929	$ 86,075
Loans purchased	1,299,542	364,919
Loans Receivable Held-for-sale, Reconciliation to Cash Flow, Deductions from Held-for-sale	(1,399,800)	(357,018)
Change in fair value	15,976	726
Ending balance	$ 884,647	$ 94,702

CERTAIN TRANSFERS OF FINANCIA49

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Valuation allowance:
Servicing asset, net(1)	$ 45,526	$ 4,253
MSR
Servicing asset:
Balance, beginning of year(1)	28,536	423
Capitalized servicing rights	18,094	3,903
Amortization	(1,104)	(40)
Balance, end of period	45,526	4,286
Valuation allowance:
Balance, beginning of year	0	0
Increase in valuation allowance	0	33
Balance, end of period	0	33
Servicing asset, net(1)	$ 48,013	$ 4,253

CERTAIN TRANSFERS OF FINANCIA50

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 4)	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Average discount rates (percent)	9.91%	9.96%
Expected prepayment speeds (percent)	8.10%	7.91%
Weighted average life, in years	7 years 10 months 24 days	8 years

CERTAIN TRANSFERS OF FINANCIA51

CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 5) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
50 bp adverse change in prepayment speed	$ (4,471)	$ (2,833)
100 bp adverse change in prepayment speed	$ (10,835)	$ (6,812)

FINANCIAL INSTRUMENTS WITH OF52

FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments whose contract amounts represented credit risk	$ 5,829,713	$ 5,704,381
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet financial instruments whose contract amounts represented credit risk	$ 171,451	$ 171,266

REGULATORY MATTERS (Details)

REGULATORY MATTERS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Assets	$ 20,864,874		$ 21,697,134	$ 15,000,000
Common Equity Tier 1 Capital	$ 1,881,329		$ 1,841,219
Tier 1 capital	10.93%		10.23%
Total capital	13.30%		12.48%
Tier 1 leverage	10.27%		9.34%
Mortgage finance	$ 3,371,598		$ 4,497,338
Mortgage finance, average balance	$ 2,800,000
Common Equity Tier 1, Capital to Risk Weighted Assets	9.61%		8.97%
Capital	$ 2,603,536		$ 2,561,663
Tier One Risk Based Capital	2,139,542		2,101,071
Tier One Leverage Capital	$ 2,139,542		2,101,071
Common Stock, Dividends, Per Share, Declared	$ 0	$ 0
Common Stock, Dividends, Per Share, Cash Paid	$ 0	$ 0
Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Capital	$ 1,778,152		$ 1,735,496
Tier 1 capital	9.89%		9.23%
Total capital	11.97%		11.19%
Tier 1 leverage	9.29%		8.42%
Common Equity Tier 1, Capital to Risk Weighted Assets	9.09%		8.45%
Common Equity Tier 1, Capital Required to be Well Capitalized	$ 1,272,197		$ 1,334,244
Common Equity Tier 1, Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%		6.50%
Capital	$ 2,341,922		$ 2,297,528
Capital Required to be Well Capitalized	$ 1,957,226		$ 2,052,683
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%		10.00%
Tier One Risk Based Capital	$ 1,936,365		$ 1,895,348
Tier One Risk Based Capital Required to be Well Capitalized	$ 1,565,781		$ 1,642,147
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%		8.00%
Tier One Leverage Capital	$ 1,936,365		$ 1,895,348
Tier One Leverage Capital Required to be Well Capitalized	$ 1,041,888		$ 1,125,087
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%		5.00%
Advanced Approach, Phase-In Schedule [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,125,456		$ 1,052,205
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	5.75%		5.13%
Capital Required for Capital Adequacy	$ 1,810,516		$ 1,770,766
Capital Required for Capital Adequacy to Risk Weighted Assets	9.25%		8.63%
Tier One Risk Based Capital Required for Capital Adequacy	$ 1,419,053		$ 1,360,154
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.25%		6.63%
Tier One Leverage Capital Required for Capital Adequacy	$ 833,706		$ 900,268
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%
Advanced Approach, Phase-In Schedule [Member] | Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,125,405		$ 1,051,989
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	5.75%		5.13%
Capital Required for Capital Adequacy	$ 1,810,434		$ 1,770,421
Capital Required for Capital Adequacy to Risk Weighted Assets	9.25%		8.63%
Tier One Risk Based Capital Required for Capital Adequacy	$ 1,418,989		$ 1,359,888
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.25%		6.63%
Tier One Leverage Capital Required for Capital Adequacy	$ 833,510		$ 900,070
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%
Advanced Approach, Phased-In [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,370,121		$ 1,437,159
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	7.00%		7.00%
Capital Required for Capital Adequacy	$ 2,055,181		$ 2,155,715
Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%		10.50%
Tier One Risk Based Capital Required for Capital Adequacy	$ 1,663,718		$ 1,745,103
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.50%		8.50%
Tier One Leverage Capital Required for Capital Adequacy	$ 833,706		$ 900,268
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%
Advanced Approach, Phased-In [Member] | Subsidiaries [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1, Capital Required for Capital Adequacy	$ 1,370,058		$ 1,436,863
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	7.00%		7.00%
Capital Required for Capital Adequacy	$ 2,055,088		$ 2,155,295
Capital Required for Capital Adequacy to Risk Weighted Assets	10.50%		10.50%
Tier One Risk Based Capital Required for Capital Adequacy	$ 1,663,642		$ 1,744,762
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	8.50%		8.50%
Tier One Leverage Capital Required for Capital Adequacy	$ 833,510		$ 900,070
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%

STOCK-BASED COMPENSATION (Detai

STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	May 19, 2015
Restricted stock units, additional disclosures
Compensation expense	$ 4,559	$ 459
Unrecognized compensation expense related to unvested stock-settled awards	$ 20,117
Weighted average period over which expense is expected to be recognized, in years	3 years 2 months
SARs
Restricted stock units, additional disclosures
Compensation expense	$ 72	82
RSUs
Restricted stock units, additional disclosures
Compensation expense	1,593	1,048
Restricted stock
Restricted stock units, additional disclosures
Compensation expense	4	2
Cash-settled performance units
Restricted stock units, additional disclosures
Compensation expense	$ 2,890	$ (673)
2015 Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common stock shares that can be issued for compensation under the Plan			2,550,000

FAIR VALUE DISCLOSURES (Assets

FAIR VALUE DISCLOSURES (Assets and Liabilities) (Details) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale		$ 42,203		$ 24,874
Loans held for sale		884,647		968,929
OREO		18,833	[1],[2]	18,961	[1],[2]	$ 17,585	$ 278
Derivative assets		24,245		37,878
Derivative liabilities		(27,697)		(26,240)
Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[3]	14,376		15,652
Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[4]			275
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[5],[6]	11,144		8,947
Fair value measurements, recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[7]	0		0
Derivative assets	[7]	0		0
Derivative liabilities	[7]	0		0
Deferred Compensation Liability, Current and Noncurrent	[7]	4,040
Defined Benefit Plan, Fair Value of Plan Assets				1,811
Fair value measurements, recurring basis | Level 1 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8]	0		0
Fair value measurements, recurring basis | Level 1 | Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8]			0
Fair value measurements, recurring basis | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8],[9]	4,004		1,786
Fair value measurements, recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[7]	884,647		968,929
Derivative assets	[7]	24,245		37,878
Derivative liabilities	[7]	(27,697)		(26,240)
Deferred Compensation Liability, Current and Noncurrent	[7]	0
Defined Benefit Plan, Fair Value of Plan Assets				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]
Securities, available-for-sale	[8]	14,376		15,652
Fair value measurements, recurring basis | Level 2 | Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8]			275
Fair value measurements, recurring basis | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8],[9]	7,140		7,161
Fair value measurements, recurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for sale	[7]	0		0
Derivative assets	[7]	0		0
Derivative liabilities	[7]	0		0
Deferred Compensation Liability, Current and Noncurrent	[7]	0
Defined Benefit Plan, Fair Value of Plan Assets				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]
Securities, available-for-sale	[8]	0		0
Fair value measurements, recurring basis | Level 3 | Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8]			0
Fair value measurements, recurring basis | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	[8],[9]	0		0
Fair value measurements, nonrecurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[1],[10]	0		0
OREO	[1],[2]	0		0
Fair value measurements, nonrecurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[1],[10]	0		0
OREO	[1],[2]	0		0
Fair value measurements, nonrecurring basis | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	[1],[10]	50,780		52,323
OREO	[1],[2]	$ 18,833		$ 18,961
[1]	Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.
[2]	OREO is transferred from loans to OREO at fair value less selling costs.
[3]	Actual maturities may differ from contractual maturities because borrowers may have the right to prepay obligations with or without prepayment penalties.
[4]	Yields have been adjusted to a tax equivalent basis assuming a 35% federal tax rate.
[5]	Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.
[6]	These equity securities do not have a stated maturity.
[7]	Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.
[8]	Securities are measured at fair value on a recurring basis, generally monthly.
[9]	Equity securities consist of Community Reinvestment Act funds and investments related to our non-qualified deferred compensation plan.
[10]	Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

FAIR VALUE DISCLOSURES (Financi

FAIR VALUE DISCLOSURES (Financial Instruments) (Details) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016		Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
OREO		$ 18,833	[1],[2]	$ 18,961	[1],[2]	$ 17,585	$ 278
Securities, available-for-sale		42,203		24,874
Loans held for sale		884,647		968,929
Derivative assets		24,245		37,878
Servicing Asset at Fair Value, Amount		45,526		28,536
Senior Notes		281,134		281,044
Derivative liabilities		27,697		26,240
Level 1 | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,920,934		2,839,352
Securities, available-for-sale		4,004		1,786
Level 1 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,920,934		2,839,352
Securities, available-for-sale		4,004		1,786
Level 1 | Fair value measurements, nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
OREO	[1],[2]	0		0
Loans held for investment, net	[1],[3]	0		0
Level 2 | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities, available-for-sale		38,199		23,088
Loans held for sale		884,647		968,929
Derivative assets		24,245		37,878
Federal funds purchased		134,539		101,800
Customer repurchase agreements		7,295		7,775
Other borrowings		1,500,000		2,000,000
Senior Notes		281,134		281,044
Derivative liabilities		27,697		26,240
Level 2 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities, available-for-sale		38,199		23,088
Loans held for sale		884,647		968,929
Derivative assets		24,245		37,878
Federal funds purchased		134,539		101,800
Customer repurchase agreements		7,295		7,775
Other borrowings		1,500,000		2,000,000
Senior Notes		330,552		304,672
Derivative liabilities		27,697		26,240
Level 2 | Fair value measurements, nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
OREO	[1],[2]	0		0
Loans held for investment, net	[1],[3]	0		0
Level 3 | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for investment, net		16,498,503		17,330,223
Deposits		16,605,380		17,016,831
Trust preferred subordinated debentures		113,406		113,406
Level 3 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for investment, net		16,507,087		17,347,199
Deposits		16,604,650		17,017,221
Trust preferred subordinated debentures		113,406		113,406
Level 3 | Fair value measurements, nonrecurring basis
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value of impaired loans		70,100		74,100
Allowance allocation of impaired loans		19,300		21,800
OREO	[1],[2]	18,833		18,961
Loans held for investment, net	[1],[3]	$ 50,780		$ 52,323
[1]	Loans held for investment and OREO are measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions.
[2]	OREO is transferred from loans to OREO at fair value less selling costs.
[3]	Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

DERIVATIVE FINANCIAL INSTRUME57

DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivative	$ 26,643	$ 39,632
Liability Derivative	30,095	27,994
Offsetting derivative liability	(2,398)	(1,754)
Offsetting derivative asset	(2,398)	(1,754)
Derivative asset, net	24,245	37,878
Derivative liability, net	$ 27,697	26,240
Description of credit risk exposure on interest rate swaps and caps	Our credit exposure on derivative instruments is limited to the net favorable value and interest payments by each counterparty. In such cases collateral may be required from the counterparties involved if the net value of the derivative instruments exceed a nominal amount considered to be immaterial
Credit exposure relating to interest rate swaps and caps	$ 24,200	37,900
Cash collateral pledge for derivatives	26,500	$ 24,800
Interest-bearing deposits
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	24,100
Accrued interest receivable and other assets
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	$ 2,400
Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease | Weighted-average interest rate received
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	3.40%	3.17%
Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease | Weighted-average interest rate paid
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	4.61%	4.58%
Commercial loan/lease interest rate caps
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	2.44%	2.45%
Financial institution counterparties: | Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	$ 1,256,666	$ 1,144,367
Asset Derivative	2,398	1,754
Liability Derivative	22,489	25,421
Financial institution counterparties: | Commercial loan/lease interest rate caps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	231,125	210,996
Asset Derivative	639	819
Liability Derivative	0	0
Customer counterparties: | Commercial loan/lease interest rate swaps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	1,256,666	1,144,367
Asset Derivative	22,489	25,421
Liability Derivative	2,398	1,754
Customer counterparties: | Commercial loan/lease interest rate caps | Non-hedging interest rate derivatives/swaps | Commercial loan/lease
Derivatives, Fair Value [Line Items]
Notional Amount	231,125	210,996
Asset Derivative	0	0
Liability Derivative	639	819
Loan purchase commitments | Interest rate derivative | Economic hedging interest rate derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	222,492	237,805
Asset Derivative	1,117	1,351
Liability Derivative	0	0
Forward sales commitments | Interest rate derivative | Economic hedging interest rate derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	1,030,393	1,218,000
Asset Derivative	0	10,287
Liability Derivative	$ 4,569	$ 0