10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

ý Quarterly Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

For the quarterly period ended June 30, 2017

¨ Transition Report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.

For the transition period from to

Commission file number 001-34657

TEXAS CAPITAL BANCSHARES, INC.

(Exact Name of Registrant as Specified in Its Charter)

Delaware	75-2679109
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

2000 McKinney Avenue, Suite 700, Dallas, Texas, U.S.A.	75201
(Address of principal executive officers)	(Zip Code)

214/932-6600

(Registrant’s telephone number,

including area code)

N/A

(Former Name, Former Address and Former Fiscal Year, if Changed Since Last Report)

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

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

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

Large Accelerated Filer	ý		Accelerated Filer	¨
Non-Accelerated Filer	¨	(Do not check if a smaller reporting company)	Smaller Reporting Company	¨
Emerging Growth Company	¨

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

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

APPLICABLE ONLY TO CORPORATE ISSUERS:

On July 19, 2017, the number of shares set forth below was outstanding with respect to each of the issuer’s classes of common stock:

Common Stock, par value $0.01 per share 49,600,286

Texas Capital Bancshares, Inc.

Form 10-Q

Quarter Ended June 30, 2017

Index

Part I. Financial Information
Item 1.	Financial Statements
	Consolidated Balance Sheets—Unaudited	3
	Consolidated Statements of Income and Other Comprehensive Income—Unaudited	4
	Consolidated Statements of Stockholders’ Equity—Unaudited	5
	Consolidated Statements of Cash Flows—Unaudited	6
	Notes to Consolidated Financial Statements—Unaudited	7
	Financial Summaries—Unaudited	30
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	31
Item 3.	Quantitative and Qualitative Disclosures about Market Risk	45
Item 4.	Controls and Procedures	48
Part II. Other Information
Item 1.	Legal Proceedings	48
Item 1A.	Risk Factors	48
Item 6.	Exhibits	49
Signatures		50

2

PART I – FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands except share data)

	June 30, 2017			December 31, 2016
	(Unaudited)
Assets
Cash and due from banks	$	126,977		$	113,707
Interest-bearing deposits	2,117,658			2,700,645
Federal funds sold and securities purchased under resale agreements	25,000			25,000
Securities, available-for-sale	119,043			24,874
Loans held for sale ($843.2 million and $968.9 million at June 30, 2017 and December 31, 2016, respectively, at fair value )	846,017			968,929
Loans held for investment, mortgage finance	5,183,600			4,497,338
Loans held for investment (net of unearned income)	14,280,353			13,001,011
Less: Allowance for loan losses	174,225			168,126
Loans held for investment, net	19,289,728			17,330,223
Mortgage servicing rights, net	63,023			28,536
Premises and equipment, net	20,750			19,775
Accrued interest receivable and other assets	492,240			465,933
Goodwill and intangible assets, net	19,277			19,512
Total assets	$	23,119,713		$	21,697,134
Liabilities and Stockholders’ Equity
Liabilities:
Deposits:
Non-interest-bearing	$	8,174,830		$	7,994,201
Interest-bearing	9,117,393			9,022,630
Total deposits	17,292,223			17,016,831
Accrued interest payable	6,246			5,498
Other liabilities	163,836			161,223
Federal funds purchased and repurchase agreements	462,224			109,575
Other borrowings	2,700,000			2,000,000
Subordinated notes, net	281,225			281,044
Trust preferred subordinated debentures	113,406			113,406
Total liabilities	21,019,160			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, 2017 and December 31, 2016	150,000			150,000
Common stock, $.01 par value:
Authorized shares – 100,000,000
Issued shares – 49,595,669 and 49,504,079 at June 30, 2017 and December 31, 2016, respectively	496			495
Additional paid-in capital	957,721			955,468
Retained earnings	991,949			903,187
Treasury stock (shares at cost: 417 at June 30, 2017 and December 31, 2016)	(8		)	(8		)
Accumulated other comprehensive income, net of taxes	395			415
Total stockholders’ equity	2,100,553			2,009,557
Total liabilities and stockholders’ equity	$	23,119,713		$	21,697,134

See accompanying notes to consolidated financial statements.

3

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME – UNAUDITED

(In thousands except per share data)

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Interest income
Interest and fees on loans	$	201,646		$	168,064		$	378,270		$	323,949
Securities	287			246			512			507
Federal funds sold and securities purchased under resale agreements	434			382			964			754
Deposits in other banks	5,824			3,750			12,391			7,035
Total interest income	208,191			172,442			392,137			332,245
Interest expense
Deposits	16,533			8,971			29,826			17,793
Federal funds purchased	726			110			978			236
Other borrowings	2,901			1,367			4,922			2,532
Subordinated notes	4,191			4,191			8,382			8,382
Trust preferred subordinated debentures	881			734			1,711			1,450
Total interest expense	25,232			15,373			45,819			30,393
Net interest income	182,959			157,069			346,318			301,852
Provision for credit losses	13,000			16,000			22,000			46,000
Net interest income after provision for credit losses	169,959			141,069			324,318			255,852
Non-interest income
Service charges on deposit accounts	3,067			2,411			6,112			4,521
Wealth management and trust fee income	1,402			1,098			2,759			1,911
Bank owned life insurance (BOLI) income	481			536			947			1,072
Brokered loan fees	5,809			5,864			11,487			10,509
Servicing income	3,700			50			5,901			(5		)
Swap fees	954			1,105			2,757			1,412
Other	3,356			2,868			5,916			5,809
Total non-interest income	18,769			13,932			35,879			25,229
Non-interest expense
Salaries and employee benefits	63,154			54,810			126,157			106,182
Net occupancy expense	6,515			5,838			12,626			11,650
Marketing	6,157			4,486			11,107			8,394
Legal and professional	7,127			6,226			14,580			11,550
Communications and technology	11,906			6,391			18,412			12,608
FDIC insurance assessment	4,603			6,043			10,597			11,512
Servicing related expenses	2,682			612			4,432			685
Other	9,670			9,849			19,997			18,494
Total non-interest expense	111,814			94,255			217,908			181,075
Income before income taxes	76,914			60,746			142,289			100,006
Income tax expense	25,819			21,866			48,652			35,998
Net income	51,095			38,880			93,637			64,008
Preferred stock dividends	2,437			2,437			4,875			4,875
Net income available to common stockholders	$	48,658		$	36,443		$	88,762		$	59,133
Other comprehensive income (loss)
Change in net unrealized gain on available-for-sale securities arising during period, before-tax	$	(33	)	$	(22	)	$	(30	)	$	(58	)
Income tax benefit related to net unrealized gain on available-for-sale securities	(11		)	(8		)	(10		)	(20		)
Other comprehensive loss, net of tax	(22		)	(14		)	(20		)	(38		)
Comprehensive income	$	51,073		$	38,866		$	93,617		$	63,970
Basic earnings per common share	$	0.98		$	0.79		$	1.79		$	1.29
Diluted earnings per common share	$	0.97		$	0.78		$	1.77		$	1.27

See accompanying notes to consolidated financial statements.

4

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - UNAUDITED

(In thousands except share data)

	Preferred Stock			Common Stock									Treasury Stock
	Shares	Amount		Shares	Amount		Additional Paid-in Capital			Retained Earnings			Shares		Amount			Accumulated Other Comprehensive Income (Loss), Net of Taxes			Total
Balance at December 31, 2015 (audited)	6,000,000	$	150,000	45,874,224	$	459	$	714,546		$	757,818		(417	)	$	(8	)	$	718		$	1,623,533
Comprehensive income:
Net income	—	—		—	—		—			64,008			—		—			—			64,008
Change in unrealized gain on available-for-sale securities, net of taxes of $20	—	—		—	—		—			—			—		—			(38		)	(38		)
Total comprehensive income																					63,970
Tax benefit related to exercise of stock-based awards	—	—		—	—		450			—			—		—			—			450
Stock-based compensation expense recognized in earnings	—	—		—	—		2,243			—			—		—			—			2,243
Preferred stock dividend	—	—		—	—		—			(4,875		)	—		—			—			(4,875		)
Issuance of stock related to stock-based awards	—	—		79,104	1		(587		)	—			—		—			—			(586		)
Balance at June 30, 2016	6,000,000	$	150,000	45,953,328	$	460	$	716,652		$	816,951		(417	)	$	(8	)	$	680		$	1,684,735
Balance at December 31, 2016 (audited)	6,000,000	$	150,000	49,504,079	$	495	$	955,468		$	903,187		(417	)	$	(8	)	$	415		$	2,009,557
Comprehensive income:
Net income	—	—		—	—		—			93,637			—		—			—			93,637
Change in unrealized gain on available-for-sale securities, net of taxes of $10	—	—		—	—		—			—			—		—			(20		)	(20		)
Total comprehensive income																					93,617
Stock-based compensation expense recognized in earnings	—	—		—	—		3,461			—			—		—			—			3,461
Preferred stock dividend	—	—		—	—		—			(4,875		)	—		—			—			(4,875		)
Issuance of stock related to stock-based awards	—	—		57,995	1		(1,208		)	—			—		—			—			(1,207		)
Issuance of common stock related to warrants	—	—		33,595	—		—			—			—		—			—			—
Balance at June 30, 2017	6,000,000	$	150,000	49,595,669	$	496	$	957,721		$	991,949		(417	)	$	(8	)	$	395		$	2,100,553

See accompanying notes to consolidated financial statements.

5

TEXAS CAPITAL BANCSHARES, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS—UNAUDITED

(In thousands)

	Six months ended June 30,
	2017			2016
Operating activities
Net income	$	93,637		$	64,008
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	22,000			46,000
Depreciation and amortization	12,346			10,446
Increase in valuation allowance on mortgage servicing rights	—			414
Bank owned life insurance (BOLI) income	(947		)	(1,072		)
Stock-based compensation expense	8,954			3,725
Excess tax benefits from stock-based compensation arrangements	—			(553		)
Purchases and originations of loans held for sale	(2,843,690		)	(876,516		)
Proceeds from sales and repayments of loans held for sale	2,939,002			734,964
Loss on sale of loans held for sale and other assets	93			12
Technology write-off	5,285			—
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(46,025		)	(71,805		)
Accrued interest payable and other liabilities	(488		)	23,094
Net cash provided by (used in) operating activities	190,167			(67,283		)
Investing activities
Purchases of available-for-sale securities	(96,871		)	(783		)
Maturities and calls of available-for-sale securities	275			265
Principal payments received on available-for-sale securities	2,397			3,080
Originations of mortgage finance loans	(37,251,933		)	(45,811,787		)
Proceeds from pay-offs of mortgage finance loans	36,565,671			45,518,036
Net increase in loans held for investment, excluding mortgage finance loans	(1,297,460		)	(794,749		)
Purchase of premises and equipment, net	(4,194		)	(1,166		)
Proceeds from sale of foreclosed assets	272			62
Net cash used in investing activities	(2,081,843		)	(1,087,042		)
Financing activities
Net increase in deposits	275,392			1,618,946
Costs from issuance of stock related to stock-based awards and warrants	(1,207		)	(586		)
Preferred dividends paid	(4,875		)	(4,875		)
Net increase in other borrowings	700,000			519,463
Excess tax benefits from stock-based compensation arrangements	—			553
Net increase (decrease) in Federal funds purchased and repurchase agreements	352,649			(47,069		)
Net cash provided by (used in) financing activities	1,321,959			2,086,432
Net increase (decrease) in cash and cash equivalents	(569,717		)	932,107
Cash and cash equivalents at beginning of period	2,839,352			1,790,870
Cash and cash equivalents at end of period	$	2,269,635		$	2,722,977
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	$	45,071		$	30,151
Cash paid during the period for income taxes	52,042			43,309
Transfers from loans/leases to OREO and other repossessed assets	—			18,540

See accompanying notes to consolidated financial statements.

6

TEXAS CAPITAL BANCSHARES, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS—UNAUDITED

(1) 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 value of mortgage servicing rights ("MSRs") and the status of contingencies are particularly susceptible to significant change.

7

(2) 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   June 30,				Six months ended   June 30,
	2017		2016		2017		2016
Numerator:
Net income	$	51,095	$	38,880	$	93,637	$	64,008
Preferred stock dividends	2,437		2,437		4,875		4,875
Net income available to common stockholders	48,658		36,443		$	88,762	59,133
Denominator:
Denominator for basic earnings per share— weighted average shares	49,576,837		45,924,281		49,556,393		45,906,508
Effect of employee stock-based awards(1)	224,306		124,974		244,058		121,524
Effect of warrants to purchase common stock	428,527		388,877		432,660		368,574
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,229,670		46,438,132		50,233,111		46,396,606
Basic earnings per common share	$	0.98	$	0.79	$	1.79	$	1.29
Diluted earnings per common share	$	0.97	$	0.78	$	1.77	$	1.27

(1) SARs and RSUs outstanding of 6,200 at June 30, 2017 and 252,754 at June 30, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

8

(3) SECURITIES

The following is a summary of available-for-sale securities (in thousands):

	June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale securities:
U.S. Treasuries	$	94,360	$	—	$	(5	)	$	94,355
Residential mortgage-backed securities	12,284		832		—			13,116
Equity securities(1)	11,790		150		(368		)	11,572
	$	118,434	$	982	$	(373	)	$	119,043
	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):

	June 30, 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	$	94,360		$	—		$	—		$	—		$	94,360
Estimated fair value	94,355			—			—			—			94,355
Weighted average yield(3)	0.92		%	—		%	—		%	—		%	0.92		%
Residential mortgage-backed securities:(1)
Amortized cost	423			723			2,697			8,441			12,284
Estimated fair value	433			748			2,999			8,936			13,116
Weighted average yield(3)	4.70		%	4.72		%	5.55		%	3.00		%	3.40		%
Equity securities:(4)
Amortized cost	11,790			—			—			—			11,790
Estimated fair value	11,572			—			—			—			11,572
Total available-for-sale securities:
Amortized cost													$	118,434
Estimated fair value													$	119,043

9

	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 June 30, 2017, securities with carrying values of $91.5 million and $8.5 million were pledged to secure certain deposits and repurchase agreements, respectively.

The following table discloses, as of June 30, 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):

June 30, 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	$	82,380	$	(5	)	$	—	$	—		$	82,380	$	(5	)
Equity securities(1)	1,021		—			6,132		(368		)	7,153		(368		)
	$	83,401	$	(5	)	$	6,132	$	(368	)	$	89,533	$	(373	)
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	)

(1) Less than 12 months unrealized loss amount not meaningful.

At June 30, 2017, we owned six securities in an unrealized loss position, four 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 securities are publicly traded equity funds and are subject to market pricing volatility. We do not believe these unrealized losses are “other-than-temporary” as of June 30, 2017. 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 we have the ability and intent to hold the investments until recovery of fair value.

10

(4) LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR LOAN LOSSES

At June 30, 2017 and December 31, 2016, loans held for investment were as follows (in thousands):

	June 30, 2017			December 31, 2016
Commercial	$	8,250,952		$	7,291,545
Mortgage finance	5,183,600			4,497,338
Construction	2,242,562			2,098,706
Real estate	3,569,787			3,462,203
Consumer	39,122			34,587
Leases	274,863			185,529
Gross loans held for investment	19,560,886			17,569,908
Deferred income (net of direct origination costs)	(96,933		)	(71,559		)
Allowance for loan losses	(174,225		)	(168,126		)
Total loans held for investment	$	19,289,728		$	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 June 30, 2017 and December 31, 2016 are stated net of $234.1 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.

11

At June 30, 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 general reserves, 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 June 30, 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 June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	7,984,302	$	5,183,600	$	2,236,870	$	3,523,118	$	38,637	$	254,772	$	19,221,299
Special mention	43,223		—		5,692		26,290		369		2,666		78,240
Substandard-accruing	103,859		—		—		16,217		116		17,425		137,617
Non-accrual	119,568		—		—		4,162		—		—		123,730
Total loans held for investment	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886
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

12

The following table details activity in the allowance for loan losses by portfolio segment for the six months ended June 30, 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.

June 30, 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	19,384		—		680			3,436			287			2,989			(2,559		)	24,217
Charge-offs	21,543		—		—			40			180			—			—			21,763
Recoveries	3,442		—		101			53			41			8			—			3,645
Net charge-offs (recoveries)	18,101		—		(101		)	(13		)	139			(8		)	—			18,118
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
Period end amount allocated to:
Loans individually evaluated for impairment	$	28,382	$	—	$	—		$	180		$	—		$	—		$	—		$	28,562
Loans collectively evaluated for impairment	101,669		—		13,925			22,418			389			4,121			3,141			145,663
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
June 30, 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	44,324		—		758			1,423			(28		)	(2,531		)	1,710			45,656
Charge-offs	24,287		—		—			528			—			—			—			24,815
Recoveries	5,334		—		34			21			11			45			—			5,445
Net charge-offs (recoveries)	18,953		—		(34		)	507			(11		)	(45		)	—			19,370
Ending balance	$	137,817	$	—	$	7,628		$	14,297		$	321		$	1,445		$	5,889		$	167,397
Period end amount allocated to:
Loans individually evaluated for impairment	$	30,775	$	—	$	—		$	196		$	—		$	—		$	—		$	30,971
Loans collectively evaluated for impairment	107,042		—		7,628			14,101			321			1,445			5,889			136,426
Ending balance	$	137,817	$	—	$	7,628		$	14,297		$	321		$	1,445		$	5,889		$	167,397

The table below presents the activity in the portion of the allowance for credit losses related to losses on unfunded commitments for the three and six months ended June 30, 2017 and 2016 (in thousands). This liability is recorded in other liabilities in the consolidated balance sheet.

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Beginning balance	$	10,847		$	10,216		$	11,422		$	9,011
Provision for off-balance sheet credit losses	(1,642		)	(861		)	(2,217		)	344
Ending balance	$	9,205		$	9,355		$	9,205		$	9,355

13

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 June 30, 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.

Our recorded investment in loans as of June 30, 2017, December 31, 2016 and June 30, 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):

June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	120,770	$	—	$	—	$	4,514	$	—	$	—	$	125,284
Loans collectively evaluated for impairment	8,130,182		5,183,600		2,242,562		3,565,273		39,122		274,863		19,435,602
Total	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886
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
June 30, 2016
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	164,339	$	—	$	—	$	4,210	$	—	$	—	$	168,549
Loans collectively evaluated for impairment	7,014,025		5,260,027		2,023,725		3,224,643		26,283		103,565		17,652,268
Total	$	7,178,364	$	5,260,027	$	2,023,725	$	3,228,853	$	26,283	$	103,565	$	17,820,817

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 June 30, 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.

14

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 June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	21,624	$	23,873	$	—	$	24,135	$	—
Energy	36,577		47,821		—		41,206		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	2,591		2,591		—		2,435		—
Secured by 1-4 family	—		—		—		—		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	60,792	$	74,285	$	—	$	67,776	$	—
With an allowance recorded:
Commercial
Business loans	$	16,510	$	17,330	$	2,908	$	21,320	$	—
Energy	46,059		59,761		25,474		58,030		6
Construction
Market risk	—		—		—		53		—
Real estate
Market risk	352		352		8		1,009		—
Commercial	—		—		—		—		—
Secured by 1-4 family	1,571		1,571		172		1,153		—
Consumer	—		—		—		133		—
Leases	—		—		—		55		—
Total impaired loans with an allowance recorded	$	64,492	$	79,014	$	28,562	$	81,753	$	6
Combined:
Commercial
Business loans	$	38,134	$	41,203	$	2,908	$	45,455	$	—
Energy	82,636		107,582		25,474		99,236		6
Construction
Market risk	—		—		—		53		—
Real estate
Market risk	352		352		8		1,009		—
Commercial	2,591		2,591		—		2,435		—
Secured by 1-4 family	1,571		1,571		172		1,153		—
Consumer	—		—		—		133		—
Leases	—		—		—		55		—
Total impaired loans	$	125,284	$	153,299	$	28,562	$	149,529	$	6

15

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

16

Average impaired loans outstanding during the six months ended June 30, 2017 and 2016 totaled $149.5 million and $177.5 million, respectively.

The table below provides an age analysis of our loans held for investment as of June 30, 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	$	22,321	$	6,988	$	9,340	$	38,649	$	36,932	$	7,205,942	$	7,281,523
Energy	1,579		—		—		1,579		82,636		885,214		969,429
Mortgage finance loans	—		—		—		—		—		5,183,600		5,183,600
Construction
Market risk	—		—		—		—		—		2,216,582		2,216,582
Secured by 1-4 family	—		—		—		—		—		25,980		25,980
Real estate
Market risk	3,899		—		1,630		5,529		—		2,597,565		2,603,094
Commercial	536		10,778		—		11,314		2,591		713,946		727,851
Secured by 1-4 family	5,221		57		107		5,385		1,571		231,886		238,842
Consumer	—		—		—		—		—		39,122		39,122
Leases	117		—		—		117		—		274,746		274,863
Total loans held for investment	$	33,673	$	17,823	$	11,077	$	62,573	$	123,730	$	19,374,583	$	19,560,886

(1) Loans past due 90 days and still accruing includes premium finance loans of $6.3 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 June 30, 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 June 30, 2017 and December 31, 2016, $16.7 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.

17

The following table summarizes, for the six months ended June 30, 2017 and 2016, loans that were restructured during 2017 and 2016 (in thousands):

June 30, 2017
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,070	$	700
Commercial business loans	1	$	599	$	672
Total new restructured loans in 2017	2	$	1,669	$	1,372
June 30, 2016
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	2	$	14,235	$	14,054
Total new restructured loans in 2016	2	$	14,235	$	14,054

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 June 30, 2017 or 2016.

The following table provides information on how restructured loans were modified during the six months ended June 30, 2017 and 2016 (in thousands):

	Six months ended June 30,
	2017		2016
Extended maturity	$	700	$	—
Adjusted payment schedule	—		12,735
Combination of maturity extension and payment schedule adjustment	—		1,319
Other	672		—
Total	$	1,372	$	14,054

As of June 30, 2017 and 2016, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

(5) 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 June 30,					Six months ended June 30,
	2017			2016		2017			2016
Beginning balance	$	18,833		$	17,585	$	18,961		$	278
Additions	—			1,142		—			18,540
Sales	(144		)	—		(272		)	(91		)
Ending balance	$	18,689		$	18,727	$	18,689		$	18,727

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 and charged to other non-interest expense. We did not record a valuation allowance during the six months endedJune 30, 2017 and 2016.

18

(6) 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. Gains and losses on the sale of mortgage loans held for sale and changes in the fair value of the loans held for sale are included in other non-interest income on the consolidated income statement.

Residential mortgage loans held for sale 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 June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017			December 31, 2016
Outstanding balance(1)	$	844,728		$	980,414
Fair value(1)	843,164			968,929
Fair value over/(under) outstanding balance	$	(1,564	)	$	(11,485	)

(1) Does not include $2.9 million of loans held for sale carried at lower of cost or market.

No loans held for sale were 90 days or more past due or on non-accrual as of June 30, 2017 and December 31, 2016.

The table below presents a reconciliation of the changes in loans held for sale for the six months endedJune 30, 2017 and 2016 (in thousands):

	Six months ended June 30,
	2017			2016
Beginning balance	$	968,929		$	86,075
Loans purchased	2,843,690			876,516
Payments and loans sold	(2,976,523		)	(743,769		)
Change in fair value	9,921			2,525
Ending balance	$	846,017		$	221,347

(1) Includes $2.9 million of loans held for sale carried at lower of cost or market.

19

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 six months endedJune 30, 2017 and 2016 is as follows (in thousands):

	Six months ended June 30,
	2017			2016
Servicing asset:
Balance, beginning of year(1)	$	28,536		$	423
Capitalized servicing rights	37,343			8,805
Amortization	(2,856		)	(271		)
Balance, end of period	$	63,023		$	8,957
Valuation allowance:
Balance, beginning of year	$	—		$	—
Increase in valuation allowance	—			414
Balance, end of period	$	—		$	414
Servicing asset, net(1)	$	63,023		$	8,543
Fair value	$	64,889		$	8,543

(1) MSRs are reported on the consolidated balance sheets at lower of amortized cost or market.

At June 30, 2017 and December 31, 2016, our servicing portfolio of residential mortgage loans sold had an outstanding principal balance of $5.0 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 $33.8 million at June 30, 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 June 30, 2017 and December 31, 2016, management used the following assumptions to determine the fair value of MSRs:

	June 30, 2017		December 31, 2016
Average discount rates	9.91	%	9.96	%
Expected prepayment speeds	8.98	%	7.91	%
Weighted average life, in years	7.5		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):

	June 30, 2017			December 31, 2016
50 bp adverse change in prepayment speed	$	(7,891	)	$	(2,833	)
100 bp adverse change in prepayment speed	(18,537		)	(6,812		)

These sensitivities are hypothetical and actual results may differ materially due to a number of factors. The effect on fair value of a 10% variation in assumptions generally cannot be determined 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.

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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 six months endedJune 30, 2017 and 2016. The historical industry data loss factors and experienced losses are accumulated for each sale vintage and applied to more recent sale vintages to estimate inherent losses not yet realized. Our estimated exposure related to these loans was $1.1 million at June 30, 2017 and $363,000 at June 30, 2016 and is recorded in other liabilities in the consolidated balance sheets. We had $7,200 in losses due to repurchase, indemnification or make-whole obligations during the six months endedJune 30, 2017 and no losses during the six months ended2016.

(7) 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):

	June 30, 2017		December 31, 2016
Commitments to extend credit	$	6,241,135	$	5,704,381
Standby letters of credit	183,986		171,266

(8) 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.

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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 June 30, 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 June 30, 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.

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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 June 30, 2017:
CET1
Company	$	1,931,595	8.61	%	$	1,290,441	5.75	%	$	1,570,972	7.00	%	N/A	N/A
Bank	1,830,487		8.16	%	1,290,050		5.75	%	1,570,495		7.00	%	1,458,317	6.50	%
Total capital (to risk-weighted assets)
Company	2,654,760		11.83	%	2,075,928		9.25	%	2,356,458		10.50	%	N/A	N/A
Bank	2,395,189		10.68	%	2,075,297		9.25	%	2,355,743		10.50	%	2,243,565	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,190,105		9.76	%	1,627,078		7.25	%	1,907,609		8.50	%	N/A	N/A
Bank	1,988,997		8.87	%	1,626,584		7.25	%	1,907,030		8.50	%	1,794,852	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,190,105		10.28	%	852,102		4.00	%	852,102		4.00	%	N/A	N/A
Bank	1,988,997		9.34	%	851,915		4.00	%	851,915		4.00	%	1,064,894	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 June 30, 2017, our total mortgage finance loans were $5.2 billion compared to the average for the three months ended June 30, 2017 of $3.8 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

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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 six months endedJune 30, 2017 or 2016.

(9) 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 June 30, 2017.

	Three months ended June 30,				Six months ended June 30,
(in thousands)	2017		2016		2017		2016
Stock-settled awards:
SARs	$	74	$	77	$	146	$	159
RSUs	1,714		1,030		3,307		2,078
Restricted stock	4		4		8		6
Cash-settled performance units	2,603		2,155		5,493		1,482
Total	$	4,395	$	3,266	$	8,954	$	3,725

(in thousands)	June 30, 2017
Unrecognized compensation expense related to unvested stock-settled awards	$	20,035
Weighted average period over which expense is expected to be recognized, in years	3.2

(10) 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 U.S. Treasuries and 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. 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 using observable market data.

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.

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Assets and liabilities measured at fair value at June 30, 2017 and December 31, 2016 are as follows (in thousands):

	Fair Value Measurements Using
June 30, 2017	Level 1		Level 2		Level 3
Available-for-sale securities:(1)
U.S. Treasuries	$	94,355	$	—	$	—
Residential mortgage-backed securities	—		13,116		—
Equity securities(2)	4,419		7,153		—
Loans held for sale (3)	—		843,164		—
Loans held for investment(4) (6)	—		—		43,702
OREO(5) (6)	—		—		18,689
Derivative assets(7)	—		28,234		—
Derivative liabilities(7)	—		26,432		—
Non-qualified deferred compensation plan liabilities (8)	4,502		—		—
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, excluding SBA loans, 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 collateral dependent impaired loans and OREO on a nonrecurring basis as described below.

Loans held for investment

At June 30, 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 $43.7 million fair value of loans held for investment at June 30, 2017 reported above includes impaired loans held for investment with a carrying value of $59.3 million that were reduced by specific allowance allocations totaling $15.6 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

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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 June 30, 2017 and December 31, 2016, OREO had a carrying value of $18.7 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):

	June 30, 2017				December 31, 2016
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 1 inputs:
Cash and cash equivalents	$	2,269,635	$	2,269,635	$	2,839,352	$	2,839,352
Securities, available-for-sale	98,774		98,774		1,786		1,786
Level 2 inputs:
Securities, available-for-sale	20,269		20,269		23,088		23,088
Loans held for sale	846,017		846,234		968,929		968,929
Derivative assets	28,234		28,234		37,878		37,878
Level 3 inputs:
Loans held for investment, net	19,289,728		19,300,751		17,330,223		17,347,199
Financial liabilities:
Level 2 inputs:
Federal funds purchased	457,800		457,800		101,800		101,800
Customer repurchase agreements	4,424		4,424		7,775		7,775
Other borrowings	2,700,000		2,700,000		2,000,000		2,000,000
Subordinated notes	281,225		341,671		281,044		304,672
Derivative liabilities	26,342		26,342		26,240		26,240
Level 3 inputs:
Deposits	17,292,223		17,296,750		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 U.S. Treasury securities and equity securities related to our non-qualified deferred compensation plan which are valued using quoted market prices for identical equity securities in an active

26

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 liabilities 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.

(11) 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 and six months ended June 30, 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.

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During the three and six months ended June 30, 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 June 30, 2017 and December 31, 2016 are presented in the following tables (in thousands):

	June 30, 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	$	1,369,885	$	1,632		$	25,512		$	1,144,367	$	1,754		$	25,421
Commercial loan/lease interest rate caps	266,886		347			2			210,996		819			—
Customer counterparties:
Commercial loan/lease interest rate swaps	1,369,885		25,512			1,632			1,144,367		25,421			1,754
Commercial loan/lease interest rate caps	266,886		2			347			210,996		—			819
Economic hedging interest rate derivatives:
Loan purchase commitments	236,187		209			573			237,805		1,351			—
Forward sales commitments	1,029,400		2,166			—			1,218,000		10,287			—
Gross derivatives			29,868			28,066					39,632			27,994
Offsetting derivative assets/liabilities			(1,634		)	(1,634		)			(1,754		)	(1,754		)
Net derivatives included in the consolidated balance sheets			$	28,234		$	26,432				$	37,878		$	26,240

The weighted average received and paid interest rates for interest rate swaps outstanding at June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017 Weighted Average Interest Rate				December 31, 2016 Weighted Average Interest Rate
	Received		Paid		Received		Paid
Non-hedging interest rate swaps	3.49	%	4.47	%	3.17	%	4.58	%

The weighted average strike rate for outstanding interest rate caps was 2.50% at June 30, 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 $28.2 million at June 30, 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 values. At June 30, 2017, we had $37.0 million in cash collateral pledged for these derivatives, of which $30.9 million was included in interest-bearing deposits and $6.1 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.

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(12) 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 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.

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QUARTERLY FINANCIAL SUMMARIES – UNAUDITED

Consolidated Daily Average Balances, Average Yields and Rates

(In thousands)

	For the three months ended   June 30, 2017						For the three months ended   June 30, 2016
	Average Balance		Revenue/ Expense(1)		Yield/ Rate		Average Balance		Revenue/ Expense(1)		Yield/ Rate
Assets
Securities – taxable	$	65,049	$	287	1.77	%	$	27,097	$	240	3.57	%
Securities – non-taxable(2)	—		—		—	%	564		8		5.87	%
Federal funds sold and securities purchased under resale agreements	174,264		434		1.00	%	312,832		382		0.49	%
Deposits in other banks	2,250,330		5,824		1.04	%	2,871,295		3,750		0.53	%
Loans held for sale	845,623		8,235		3.91	%	157,898		1,350		3.44	%
Loans held for investment, mortgage finance	3,805,831		33,399		3.52	%	4,412,091		33,974		3.10	%
Loans held for investment(2)	13,718,739		161,369		4.72	%	12,276,272		132,740		4.35	%
Less reserve for loan losses	170,957		—		—		164,316		—		—
Loans held for investment, net	17,353,613		194,768		4.50	%	16,524,047		166,714		4.06	%
Total earning assets	20,688,879		209,548		4.06	%	19,893,733		172,444		3.49	%
Cash and other assets	632,097						544,737
Total assets	$	21,320,976					$	20,438,470
Liabilities and Stockholders’ Equity
Transaction deposits	$	2,008,872	$	2,893	0.58	%	$	2,207,726	$	1,749	0.32	%
Savings deposits	6,952,317		12,940		0.75	%	6,388,133		6,494		0.41	%
Time deposits	455,542		700		0.62	%	486,610		727		0.60	%
Total interest-bearing deposits	9,416,731		16,533		0.70	%	9,082,469		8,970		0.40	%
Other borrowings	1,456,737		3,627		1.00	%	1,411,387		1,476		0.42	%
Subordinated notes	281,167		4,191		5.98	%	280,805		4,191		6.00	%
Trust preferred subordinated debentures	113,406		881		3.12	%	113,406		735		2.61	%
Total interest-bearing liabilities	11,268,041		25,232		0.90	%	10,888,067		15,372		0.57	%
Demand deposits	7,863,402						7,767,693
Other liabilities	102,653						113,927
Stockholders’ equity	2,086,880						1,668,783
Total liabilities and stockholders’ equity	$	21,320,976					$	20,438,470
Net interest income(2)			$	184,316					$	157,072
Net interest margin					3.57	%					3.18	%
Net interest spread					3.16	%					2.92	%
Loan spread(3)					4.04	%					3.82	%

(1) The loan averages include non-accrual loans and are stated net of unearned income.

(2) Taxable equivalent rates used where applicable.

(3) Yield on loans, net of reserves, less funding cost including all deposits and borrowed funds.

	For the six months ended June 30, 2017						For the six months ended June 30, 2016
	Average Balance		Revenue/ Expense(1)		Yield/ Rate		Average Balance		Revenue/ Expense(1)		Yield/ Rate
Assets
Securities – taxable	$	48,569	$	511	2.12	%	$	27,720	$	494	3.59	%
Securities – non-taxable(2)	111		3		4.85	%	661		19		5.77	%
Federal funds sold and securities purchased under resale agreements	225,303		964		0.86	%	308,628		754		0.49	%
Deposits in other banks	2,778,360		12,391		0.90	%	2,760,230		7,035		0.51	%
Loans held for sale	954,368		17,770		3.75	%	141,991		2,444		3.46	%
Loans held for investment, mortgage finance	3,284,594		56,504		3.47	%	4,068,302		63,011		3.11	%
Loans held for investment(2)	13,351,681		306,387		4.63	%	12,093,530		258,494		4.30	%
Less reserve for loan losses	170,143		—		—		152,721		—		—
Loans held for investment, net	16,466,132		362,891		4.44	%	16,009,111		321,505		4.04	%
Total earning assets	20,472,843		394,530		3.89	%	19,248,341		332,251		3.47	%
Cash and other assets	619,500						525,382
Total assets	$	21,092,343					$	19,773,723
Liabilities and Stockholders’ Equity
Transaction deposits	$	2,008,638	$	5,086	0.51	%	$	2,106,271	$	3,130	0.30	%
Savings deposits	6,970,929		23,423		0.68	%	6,361,779		13,208		0.42	%
Time deposits	441,733		1,317		0.60	%	498,186		1,455		0.59	%
Total interest-bearing deposits	9,421,300		29,826		0.64	%	8,966,236		17,793		0.40	%
Other borrowings	1,395,551		5,900		0.85	%	1,379,192		2,768		0.40	%
Subordinated notes	281,122		8,382		6.01	%	280,759		8,382		6.00	%
Trust preferred subordinated debentures	113,406		1,711		3.04	%	113,406		1,450		2.57	%
Total interest-bearing liabilities	11,211,379		45,819		0.82	%	10,739,593		30,393		0.57	%
Demand deposits	7,706,243						7,249,140
Other liabilities	110,222						131,173
Stockholders’ equity	2,064,499						1,653,817
Total liabilities and stockholders’ equity	$	21,092,343					$	19,773,723
Net interest income(2)			$	348,711					$	301,858
Net interest margin					3.43	%					3.15	%
Net interest spread					3.07	%					2.90	%
Loan spread(3)					4.02	%					3.80	%

(1) The loan averages include non-accrual loans and are stated net of unearned income.

(2) Taxable equivalent rates used where applicable.

(3) Yield on loans, net of reserves, less funding cost including all deposits and borrowed funds.

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

Forward-Looking Statements

Certain statements and financial analysis contained in this report that are not historical facts are forward-looking statements made pursuant to the safe harbor provisions of federal securities laws. Forward-looking statements may also be contained in our future filings with SEC, in press releases and in oral and written statements made by us or with our approval that are not statements of historical fact. These forward-looking statements are based on our beliefs, assumptions and expectations of our future performance taking into account all information currently available to us. Words such as “believes,” “expects,” “estimates,” “anticipates,” “plans,” “goals,” “objectives,” “expects,” “intends,” “seeks,” “likely,” “targeted,” “continue,” “remain,” “will,” “should,” “may” and other similar expressions are intended to identify forward-looking statements but are not the exclusive means of identifying such statements.

Forward-looking statements may include, among other things, statements about the credit quality of our loan portfolio, economic conditions, including the continued impact on our customers from declines and volatility in oil and gas prices, expectations regarding rates of default or loan losses, volatility in the mortgage industry, our business strategies and our expectations about future financial performance, future growth and earnings, the appropriateness of our allowance for loan losses and provision for credit losses, the impact of increased regulatory requirements on our business, increased competition, interest rate risk, new lines of business, new product or service offerings and new technologies.

Forward-looking statements are subject to various risks and uncertainties, which change over time, are based on management’s expectations and assumptions at the time the statements are made and are not guarantees of future results. Important factors that could cause actual results to differ materially from the forward-looking statements include, but are not limited to, the following:

• Deterioration of the credit quality of our loan portfolio or declines in the value of collateral related to external factors such as commodity prices, real estate values or interest rates, increased default rates and loan losses or adverse changes in the industry concentrations of our loan portfolio.

• Changing economic conditions or other developments adversely affecting our commercial, entrepreneurial and professional customers.

• Changes in the value of commercial and residential real estate securing our loans or in the demand for credit to support the purchase and ownership of such assets.

• The failure to correctly assess and model the assumptions supporting our allowance for loan losses, causing it to become inadequate in the event of deteriorations in loan quality and increases in charge-offs.

• Changes in the U.S. economy in general or the Texas economy specifically resulting in deterioration of credit quality, increases in non-performing assets or charge-offs or reduced demand for credit or other financial services we offer, including the effects from declines in the level of drilling and production related to the continued volatility in oil and gas prices.

• Adverse changes in economic or market conditions, or our operating performance, which could cause access to capital market transactions and other sources of funding to become more difficult to obtain on terms and conditions that are acceptable to us.

• The inadequacy of our available funds to meet our deposit, debt and other obligations as they become due, or our failure to maintain our capital ratios as a result of adverse changes in our operating performance or financial condition, or changes in applicable regulations or regulator interpretation of regulations impacting our business or the characterization or risk weight of our assets.

• The failure to effectively balance our funding sources with cash demands by depositors and borrowers.

• The failure to manage our information systems risk or to prevent cyber-attacks against us or our third party vendors, or to manage risks from disruptions or security breaches affecting our third party vendors.

• The failure to effectively manage our interest rate risk resulting from unexpectedly large or sudden changes in interest rates or rate or maturity imbalances in our assets and liabilities, and potential adverse effects to our borrowers including their inability to repay loans with increased interest rates.

• Legislative and regulatory changes imposing further restrictions and costs on our business, a failure to remain well capitalized or well managed status or regulatory enforcement actions against us, and uncertainty related to future implementation and enforcement of regulatory requirements resulting from the current political environment.

• The failure to successfully execute our business strategy, which may include expanding into new markets, developing and launching new lines of business or new products and services within the expected timeframes and budgets or to

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successfully manage the risks related to the development and implementation of these new businesses, products or services.

• The failure to attract and retain key personnel or the loss of key individuals or groups of employees.

• Adverse changes in economic or business conditions that impact the financial markets or our customers.

• Structural changes in the markets for origination, sale and servicing of residential mortgages.

• Increased or more effective competition from banks and other financial service providers in our markets.

• Uncertainty in the pricing of mortgage loans that we purchase, and later sell or securitize, as well as competition for the MSRs related to these loans and related interest rate risk resulting from retaining MSRs, and the potential effects of higher interest rates on our MCA loan volumes.

• Material failures of our accounting estimates and risk management processes based on management judgment, or the supporting analytical and forecasting models.

• Failure of our risk management strategies and procedures, including failure or circumvention of our controls.

• Credit risk resulting from our exposure to counterparties.

• An increase in the incidence or severity of fraud, illegal payments, security breaches and other illegal acts impacting our Bank and our customers.

• The failure to maintain adequate regulatory capital to support our business.

• Unavailability of funds obtained from borrowing or capital transactions or from our Bank to fund our obligations.

• Incurrence of material costs and liabilities associated with legal and regulatory proceedings and related matters with respect to the financial services industry, including those directly involving us or our Bank.

• Environmental liability associated with properties related to our lending activities.

• Severe weather, natural disasters, acts of war or terrorism and other external events.

Actual outcomes and results may differ materially from what is expressed in our forward-looking statements and from our historical financial results due to the factors discussed elsewhere in this report or disclosed in our other SEC filings. Forward-looking statements included herein speak only as of the date hereof and should not be relied upon as representing our expectations or beliefs as of any date subsequent to the date of this report. Except as required by law, we undertake no obligation to revise any forward-looking statements contained in this report, whether as a result of new information, future events or otherwise. The factors discussed herein are not intended to be a complete summary of all risks and uncertainties that may affect our businesses. Though we strive to monitor and mitigate risk, we cannot anticipate all potential economic, operational and financial developments that may adversely impact our operations and our financial results. Forward-looking statements should not be viewed as predictions and should not be the primary basis upon which investors evaluate an investment in our securities.

Overview of Our Business Operations

We commenced our banking operations in December 1998. An important aspect of our growth strategy has been our ability to service and manage effectively a large number of loans and deposit accounts in multiple markets in Texas, as well as several lines of business serving a regional or national clientele of commercial borrowers. Accordingly, we have created an operations infrastructure sufficient to support our lending and banking operations that we continue to build out as needed to serve a larger customer base and specialized industries.

Outstanding energy loans totaled $1.1 billion, or approximately 5% of total loans, at June 30, 2017. Unfunded energy loan commitments increased by $46.0 million to $576.7 million (52% of outstanding energy loans) at June 30, 2017 compared to $530.8 million at December 31, 2016. We experienced improvement in our energy portfolio in the first six months of 2017, recording $6.4 million in net charge-offs during the six months ended June 30, 2017 compared to $12.1 million for the same period in 2016. Energy non-accruals decreased to $82.6 million at June 30, 2017 compared to $100.9 million at March 31, 2017 and $125.9 million at June 30, 2016. We continue to proactively manage our energy portfolio and overall credit quality, and we believe we are appropriately reserved against further energy-related losses.

The following discussion and analysis presents the significant factors affecting our financial condition as of June 30, 2017 and December 31, 2016 and results of operations for the three and six months in the periods ended June 30, 2017 and 2016. This discussion should be read in conjunction with our consolidated financial statements and notes to the financial statements appearing in Part I, Item 1 of this report.

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Results of Operations

Summary of Performance

We reported net income of $51.1 million and net income available to common stockholders of $48.7 million, or $0.97 per diluted common share, for the second quarter of 2017 compared to net income of $38.9 million and net income available to common stockholders of $36.4 million, or $0.78 per diluted common share, for the second quarter of 2016. Return on average common equity (“ROE”) was 10.08% and return on average assets ("ROA") was 0.96% for the second quarter of 2017, compared to 9.65% and 0.77%, respectively, for the second quarter of 2016. The increase in ROE and ROA for the quarter resulted from increases in net interest income and non-interest income and a decrease in the provision for credit losses that exceeded the growth of non-interest expense. ROA also benefited from more effective utilization of liquidity balances and an increase in net interest margin. Average liquidity assets for the second quarter of 2017 totaled $2.4 billion, including $2.3 billion in deposits at the Federal Reserve Bank of Dallas, which had an average yield of 104 basis points, compared to $2.9 billion for the second quarter of 2016, which had an average yield of 53 basis points.

Net income and net income available to common stockholders for the six months ended June 30, 2017 totaled $93.6 million and $88.8 million, respectively, or $1.77 per diluted common share, compared to net income and net income available to common stockholders of $64.0 million and $59.1 million, respectively, or $1.27 per diluted common share, for the same period in 2016. ROE was 9.35% and ROA was 0.90% for the six months ended June 30, 2017 compared to 7.91% and 0.65%, respectively, for the six months ended June 30, 2016. The increase in ROE and ROA for the first half of 2017 resulted from increases in net interest income and non-interest income and a decrease in the provision for credit losses that exceeded the growth of non-interest expense. ROA also benefited from more effective utilization of liquidity balances and an increase in net interest margin.

Net income increased $12.2 million, or 31%, for the three months ended June 30, 2017, as compared to the same period in 2016. The increase was primarily the result of a $25.9 million increase in net interest income, a $3.0 million decrease in the provision for credit losses and a $4.8 million increase in non-interest income, offset by a $17.6 million increase in non-interest expense and a $4.0 million increase in income tax expense. Net income increased $29.6 million, or 46%, for the six months ended June 30, 2017, as compared to the same period in 2016. The increase was primarily the result of a $44.5 million increase in net interest income, a $24.0 million decrease in the provision for credit losses and a $10.7 million increase in non-interest income, offset by a $36.8 million increase in non-interest expense and a $12.7 million increase in income tax expense.

Details of the changes in the various components of net income are discussed below.

Net Interest Income

Net interest income was $183.0 million for the second quarter of 2017, compared to $157.1 million for the second quarter of 2016. The increase was due to an increase in average earning assets of $795.1 million as compared to the second quarter of 2016, as well as the effect of the increase in interest rates on loan yields. The increase in average earning assets included a $687.7 million increase in average loans held for sale, an $829.6 million increase in average net loans held for investment and a $37.4 million increase in average securities, offset by a $759.5 million decrease in average liquidity assets. For the quarter ended June 30, 2017, average net loans held for investment, liquidity assets and loans held for sale represented approximately 85%, 11% and 4%, respectively, of average earning assets compared to approximately 83%, 16% and less than 1% for the same quarter of 2016.

Average interest-bearing liabilities for the quarter ended June 30, 2017 increased $380.0 million from the second quarter of 2016, which included a $334.3 million increase in average interest-bearing deposits and a $45.4 million increase in other borrowings. Average demand deposits increased from $7.8 billion at June 30, 2016 to $7.9 billion at June 30, 2017. The average cost of total deposits and borrowed funds increased to 0.43% for the second quarter of 2017 compared to 0.23% for the same period of 2016. The cost of interest-bearing liabilities increased from 0.57% for the quarter ended June 30, 2016 to 0.90% for the same period of 2017.

Net interest income was $346.3 million for the six months ended June 30, 2017, compared to $301.9 million for the same period of 2016. The increase was due to an increase in average earning assets of $1.2 billion as compared to the six months ended June 30, 2016. The increase in average earning assets included an $812.4 million increase in average loans held for sale, a $457.0 million increase in average net loans held for investment and a $20.3 million increase in average securities, offset by a $65.2 million decrease in average liquidity assets. For the six months ended June 30, 2017, average net loans held for investment, liquidity assets and loans held for sale represented approximately 80%, 15% and 5%, respectively, of average earning assets compared to approximately 83%, 16% and less than 1% for the same period of 2016.

Average interest-bearing liabilities for the six months ended June 30, 2017 increased $471.8 million from the same period of 2016, which included a $455.1 million increase in average interest-bearing deposits and a $16.4 million increase in other borrowings. Average demand deposits increased from $7.2 billion at June 30, 2016 to $7.7 billion at June 30, 2017. The average

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cost of total deposits and borrowed funds increased to 0.39% for the six months ended June 30, 2017 compared to 0.24% for the same period of 2016. The cost of interest-bearing liabilities increased from 0.57% for the six months ended June 30, 2016 to 0.82% for the same period of 2017.

The following table (in thousands) presents changes in taxable-equivalent net interest income between the three and six month periods ended June 30, 2017 and June 30, 2016 and identifies the changes due to differences in the average volume of earning assets and interest-bearing liabilities and changes due to differences in the average interest rate on those assets and liabilities.

	Three months ended June 30, 2017/2016									Six months ended June 30, 2017/2016
	Net			Change Due To(1)						Net			Change Due To(1)
	Change			Volume			Yield/Rate			Change			Volume			Yield/Rate
Interest income:
Securities(2)	$	39		$	331		$	(292	)	$	1		$	354		$	(353	)
Loans held for sale	6,885			5,894			991			15,326			13,937			1,389
Loans held for investment, mortgage finance loans	(575		)	(4,560		)	3,985			(6,507		)	(12,279		)	5,772
Loans held for investment(2)	28,629			15,974			12,655			47,893			26,102			21,791
Federal funds sold	52			(170		)	222			210			(207		)	417
Deposits in other banks	2,074			(787		)	2,861			5,356			27			5,329
Total	37,104			16,682			20,422			62,279			27,934			34,345
Interest expense:
Transaction deposits	1,144			(158		)	1,302			1,956			(153		)	2,109
Savings deposits	6,446			553			5,893			10,215			1,225			8,990
Time deposits	(28		)	(51		)	23			(138		)	(169		)	31
Borrowed funds	2,151			45			2,106			3,132			25			3,107
Long-term debt	147			17			130			261			(15		)	276
Total	9,860			406			9,454			15,426			913			14,513
Net interest income	$	27,244		$	16,276		$	10,968		$	46,853		$	27,021		$	19,832

(1) Yield/rate and volume variances are allocated to yield/rate.

(2) Taxable equivalent rates are used where applicable and assume a 35% tax rate.

Net interest margin, which is defined as the ratio of net interest income to average earning assets, was 3.57% for the second quarter of 2017 compared to 3.18% for the second quarter of 2016. The year-over-year increase was primarily due to the improved earning asset composition and the effect of the increase in interest rates on loan yields attributable to our highly asset-sensitive balance sheet. Funding costs, including demand deposits and borrowed funds, increased to 0.43% for the second quarter of 2017 compared to 0.23% for the second quarter of 2016. The spread on total earning assets, net of the cost of deposits and borrowed funds, was 3.63% for the second quarter of 2017 compared to 3.26% for the second quarter of 2016. The increase resulted primarily from the increase in interest rates and increases in the higher yielding loan components of earning assets. Total funding costs, including all deposits, long-term debt and stockholders’ equity, increased to 0.47% for the second quarter of 2017 compared to 0.30% for the second quarter of 2016.

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Non-interest Income

The components of non-interest income were as follows (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Service charges on deposit accounts	$	3,067	$	2,411	$	6,112	$	4,521
Wealth management and trust fee income	1,402		1,098		2,759		1,911
Bank owned life insurance (BOLI) income	481		536		947		1,072
Brokered loan fees	5,809		5,864		11,487		10,509
Servicing related income	3,700		50		5,901		(5		)
Swap fees	954		1,105		2,757		1,412
Other	3,356		2,868		5,916		5,809
Total non-interest income	$	18,769	$	13,932	$	35,879	$	25,229

Non-interest income increased $4.8 million during the three months ended June 30, 2017 compared to the same period of 2016. This increase was primarily due to a $3.7 million increase in servicing income during the three months ended June 30, 2017 compared to the same period of 2016 as a result of the increase in servicing assets primarily related to our MCA business. Service charges increased $656,000 during the three months ended June 30, 2017 compared to the same period of 2016 as a result of the increase in deposit balances and improved pricing of treasury services.

Non-interest income increased $10.7 million during the six months ended June 30, 2017 compared to the same period of 2016. This increase was primarily due to a $5.9 million increase in servicing income during the six months ended June 30, 2017 compared to the same period of 2016 as a result of the increase in servicing assets primarily related to our MCA business.Service charges increased $1.6 million during the six months ended June 30, 2017 compared to the same period of 2016 as a result of the increase in deposit balances and improved pricing of treasury services. Swap fees increased $1.3 million during the six months ended June 30, 2017 compared to the same period of 2016. Swap fees relate to customer swap transactions and are received from the institution that is our counterparty on the transaction. These fees fluctuate from quarter to quarter based on the volume and size of transactions closed during the quarter. Brokered loan fees increased $978,000 during the six months ended June 30, 2017 compared to the same period of 2016 as a result of an increase in MCA volumes.

While management expects continued growth in certain components of non-interest income, the future rate of growth could be affected by increased competition from nationwide and regional financial institutions. In order to achieve growth in non-interest income, management from time to time evaluates new products, new lines of business and the expansion of existing lines of business. Any new product introduction or new market entry could place additional demands on capital and managerial resources.

Non-interest Expense

The components of non-interest expense were as follows (in thousands):

	Three months ended June 30,				Six months ended June 30,
	2017		2016		2017		2016
Salaries and employee benefits	$	63,154	$	54,810	$	126,157	$	106,182
Net occupancy expense	6,515		5,838		12,626		11,650
Marketing	6,157		4,486		11,107		8,394
Legal and professional	7,127		6,226		14,580		11,550
Communications and technology	11,906		6,391		18,412		12,608
FDIC insurance assessment	4,603		6,043		10,597		11,512
Servicing related expenses	2,682		612		4,432		685
Other(1)	9,670		9,849		19,997		18,494
Total non-interest expense	$	111,814	$	94,255	$	217,908	$	181,075

(1) Other expense includes such items as courier expenses, regulatory assessments other than FDIC insurance, due from bank charges and other general operating expenses, none of which account for 1% or more of total interest income and non-interest income.

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Non-interest expense for the second quarter of 2017 increased $17.6 million, or 19%, to $111.8 million from $94.3 million in the second quarter of 2016. In the second quarter of 2017, in an effort to improve processes and efficiencies, management determined that the current system in one of our support areas is not an effective technology available, resulting in a $5.3 million technology write-off of the full value of the unamortized software and development costs. We are in the process of enabling a new technology. Other factors contributing to the year-over-year increase in non-interest expense included an $8.3 million increase in salaries and employee benefits expense and a $1.7 million increase in marketing expense, both of which were due to general business growth and continued build-out, and a $2.1 million increase in servicing related expenses resulting from an increase in capitalized servicing assets, which are being amortized, primarily related to our MCA business.

Non-interest expense for the six months ended June 30, 2017 increased $36.8 million, or 20%, to $217.9 million from $181.1 million for the six months ended June 30, 2016. The increase is primarily attributable to increases of $20.0 million in salaries and employee benefits expense, $2.7 million in marketing expense, and $3.0 million in legal and professional expense, all of which were due to general business growth and continued build-out, the second quarter 2017 $5.3 million technology write-off, and a $3.7 million increase in servicing related expenses resulting from an increase in capitalized servicing assets primarily related to our MCA business.

Analysis of Financial Condition

Loans Held for Investment

Loans were as follows as of the dates indicated (in thousands):

	June 30, 2017			December 31, 2016
Commercial	$	8,250,952		$	7,291,545
Mortgage finance	5,183,600			4,497,338
Construction	2,242,562			2,098,706
Real estate	3,569,787			3,462,203
Consumer	39,122			34,587
Leases	274,863			185,529
Gross loans held for investment	19,560,886			17,569,908
Deferred income (net of direct origination costs)	(96,933		)	(71,559		)
Allowance for loan losses	(174,225		)	(168,126		)
Total loans held for investment, net	$	19,289,728		$	17,330,223

Total loans held for investment net of allowance for loan losses at June 30, 2017 increased $2.0 billion from December 31, 2016 to $19.3 billion. Our business plan focuses primarily on lending to middle market businesses and successful professionals and entrepreneurs, and as such, commercial, real estate and construction loans have comprised a majority of our loan portfolio. Consumer loans generally have represented 1% or less of the portfolio. Mortgage finance loans relate to our mortgage warehouse lending operations in which we invest in mortgage loan ownership interests that are typically sold within 10 to 20 days. Volumes fluctuate based on the level of market demand for the product and the number of days between purchase and sale of the loans as well as overall market interest rates and tend to peak at the end of each month.

We originate a substantial majority of all loans held for investment (excluding mortgage finance loans). We also participate in syndicated loan relationships, both as a participant and as an agent. As of June 30, 2017, we had $2.5 billion in syndicated loans, $690.1 million of which we administer as agent. All syndicated loans, whether we act as agent or participant, are underwritten to the same standards as all other loans we originate. As of June 30, 2017, $24.6 million of our syndicated loans were on non-accrual.

Portfolio Geographic Concentration

When considering our mortgage finance loans and other national lines of business, more than 50% of our loan exposure is outside of Texas and more than 50% of our deposits are sourced outside of Texas. However, as of June 30, 2017, a majority of our loans held for investment, excluding our mortgage finance loans and other national lines of business, were to businesses with headquarters and operations in Texas. This geographic concentration subjects the loan portfolio to the general economic conditions within this area. We also make loans to these customers that are secured by assets located outside of Texas. The risks created by this concentration have been considered by management in the determination of the adequacy of the allowance for loan losses.

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Summary of Loan Loss Experience

The provision for credit losses, which includes a provision for losses on unfunded commitments, is a charge to earnings to maintain the allowance for loan losses at a level consistent with management’s assessment of the collectability of the loan portfolio in light of current economic conditions and market trends. We recorded a provision for credit losses of $13.0 million during the second quarter of 2017 compared to $16.0 million in the second quarter of 2016 and $9.0 million in the first quarter of 2017. The decrease in provision recorded during the second quarter of 2017 compared to the same period in 2016 was primarily related to improvements in the composition of our pass-rated and classified loan portfolios, including energy loans.

The allowance for credit losses, which includes a liability for losses on unfunded commitments, totaled $183.4 million at June 30, 2017, $179.5 million at December 31, 2016 and $176.8 million at June 30, 2016. The combined allowance as a percentage of loans held for investment excluding mortgage finance loans decreased to 1.28% at June 30, 2017 from 1.38% and 1.41% at December 31, 2016 and June 30, 2016, respectively, as a result of strong loan growth.

The overall allowance for loan losses results from consistent application of our loan loss reserve methodology. At June 30, 2017, we believe the allowance is sufficient to cover all inherent losses in the portfolio and has been derived from consistent application of our methodology. Should any of the factors considered by management in evaluating the appropriateness of the allowance for loan losses change, our estimate of inherent losses in the portfolio could also change, which would affect the level of future provisions for loan losses.

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Activity in the allowance for loan losses is presented in the following table (in thousands, except percentage and multiple data):

	Six months ended   June 30, 2017			Year ended December 31, 2016			Six months ended   June 30, 2016
Allowance for loan losses:
Beginning balance	$	168,126		$	141,111		$	141,111
Loans charged-off:
Commercial	21,543			56,558			24,287
Real estate	40			528			528
Consumer	180			47			—
Leases	—			—			—
Total charge-offs	21,763			57,133			24,815
Recoveries:
Commercial	3,442			9,364			5,334
Construction	101			34			34
Real estate	53			63			21
Consumer	41			21			11
Leases	8			77			45
Total recoveries	3,645			9,559			5,445
Net charge-offs	18,118			47,574			19,370
Provision for loan losses	24,217			74,589			45,656
Ending balance	$	174,225		$	168,126		$	167,397
Allowance for off-balance sheet credit losses:
Beginning balance	$	11,422		$	9,011		$	9,011
Provision for off-balance sheet credit losses	(2,217		)	2,411			344
Ending balance	$	9,205		$	11,422		$	9,355
Total allowance for credit losses	$	183,430		$	179,548		$	176,752
Total provision for credit losses	$	22,000		$	77,000		$	46,000
Allowance for loan losses to LHI	0.90		%	0.96		%	0.94		%
Allowance for loan losses to LHI excluding mortgage finance loans	1.22		%	1.29		%	1.34		%
Net charge-offs to average LHI(1)	0.22		%	0.29		%	0.24		%
Net charge-offs to average LHI excluding mortgage finance loans(1)	0.27		%	0.38		%	0.32		%
Total provision for credit losses to average LHI	0.27		%	0.46		%	0.57		%
Total provision for credit losses to average LHI excluding mortgage finance loans	0.33		%	0.62		%	0.76		%
Recoveries to total charge-offs	16.83		%	16.73		%	21.94		%
Allowance for off-balance sheet credit losses to off-balance sheet credit commitments	0.14		%	0.19		%	0.17		%
Combined allowance for credit losses to LHI	0.94		%	1.03		%	1.00		%
Combined allowance for credit losses to LHI excluding mortgage finance loans	1.28		%	1.38		%	1.41		%
Non-performing assets:
Non-accrual loans(2)	$	123,730		$	167,791		$	165,429
OREO(3)	18,689			18,961			18,727
Total	$	142,419		$	186,752		$	184,156
Restructured loans	$	—		$	—		$	249
Loans past due 90 days and still accruing(4)	11,077			10,729			7,743
Allowance for loan losses to non-accrual loans	1.4x			1.0x			1.0x

(1) Interim period ratios are annualized.

(2) As of June 30, 2017, December 31, 2016 and June 30, 2016, non-accrual loans included $16.7 million, $18.1 million and $33.3 million, respectively, in loans that met the criteria for restructured.

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(3) We did not have a valuation allowance recorded against the OREO balance at June 30, 2017, December 31, 2016 or June 30, 2016.

(4) At June 30, 2017, December 31, 2016 and June 30, 2016, loans past due 90 days and still accruing include premium finance loans of $6.3 million, $6.8 million and $5.0 million, respectively.

Non-performing Assets

Non-performing assets include non-accrual loans and leases and repossessed assets. The table below summarizes our non-accrual loans by type and by type of property securing the credit and OREO (in thousands):

	June 30, 2017		December 31, 2016		June 30, 2016
Non-accrual loans(1)
Commercial
Oil and gas properties	$	78,824	$	115,599	$	126,658
Assets of the borrowers	15,305		18,592		31,038
Inventory	23,297		27,630		2,039
Other	2,142		3,119		2,890
Total commercial	119,568		164,940		162,625
Construction
Commercial buildings	—		—		—
Unimproved land	—		—		—
Other	—		159		—
Total construction	—		159		—
Real estate
Commercial property	2,591		2,083		2,091
Unimproved land and/or developed residential lots	—		—		—
Single family residences	1,294		—		—
Farm land	—		326		—
Other	277		—		713
Total real estate	4,162		2,409		2,804
Consumer	—		200		—
Leases	—		83		—
Total non-accrual loans	123,730		167,791		165,429
Repossessed assets:
OREO(2)	18,689		18,961		18,727
Other repossessed assets	—		—		—
Total non-performing assets	$	142,419	$	186,752	$	184,156

(1) As of June 30, 2017, December 31, 2016 and June 30, 2016, non-accrual loans included $16.7 million, $18.1 million and $33.3 million, respectively, in loans that met the criteria for restructured.

(2) We did not have a valuation allowance recorded against the OREO balance at June 30, 2017, December 31, 2016 or June 30, 2016.

Total non-performing assets at June 30, 2017 decreased $41.8 million from June 30, 2016 and $44.3 million from December 31, 2016. We experienced a significant decrease in levels of non-performing assets during the six months endedJune 30, 2017 compared to the same period in 2016, primarily related to improvements in our energy portfolio. Energy non-performing assets totaled $82.6 million at June 30, 2017 compared to $121.5 million at December 31, 2016 and $125.9 million at June 30, 2016. Our provision for credit losses decreased as a result of these improvements, as well as improvements in the composition of our pass-rated and classified loan portfolios. This resulted in a decrease in the reserve for loan losses as a percent of loans excluding mortgage finance loans for June 30, 2017 compared to December 31, 2016 and June 30, 2016.

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Potential problem loans consist of loans that are performing in accordance with contractual terms but for which we have concerns about the borrower’s ability to comply with repayment terms because of the borrower’s potential financial difficulties. We monitor these loans closely and review their performance on a regular basis. At June 30, 2017, we had $32.3 million in loans of this type, compared to $19.3 million at December 31, 2016, which were not included in either non-accrual or 90 days past due categories.

Loans Held for Sale

We launched our MCA business in the third quarter of 2015. In that 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 GSEs such as Fannie Mae and Freddie Mac. For additional information on our loans held for sale portfolio, see Note 6 - Certain Transfers of Financial Assets in the accompanying notes to the consolidated financial statements included elsewhere in this report.

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Liquidity and Capital Resources

In general terms, liquidity is a measurement of our ability to meet our cash needs. Our objective in managing our liquidity is to maintain our ability to meet loan commitments, purchase securities or repay deposits and other liabilities in accordance with their terms, without an adverse impact on our current or future earnings. Our liquidity strategy is guided by policies, formulated and monitored by our senior management and our Balance Sheet Management Committee (“BSMC”), which take into account the demonstrated marketability of assets, the sources and stability of our funding and the level of unfunded commitments. We regularly evaluate all of our various funding sources with an emphasis on accessibility, stability, reliability and cost effectiveness. For the year ended December 31, 2016 and for the six months ended June 30, 2017 our principal source of funding has been our customer deposits, supplemented by our short-term and long-term borrowings, primarily from Federal funds purchased and Federal Home Loan Bank ("FHLB") borrowings, which are generally used to fund mortgage finance assets.

Liquidity assets were $2.1 billion at June 30, 2017, and continue to be significant as a result of deposit growth and increases in borrowing capacity related to our mortgage finance loans. The following table summarizes the growth in and composition of liquidity assets (in thousands):

	June 30, 2017			December 31, 2016			June 30, 2016
Federal funds sold and securities purchased under resale agreements	$	25,000		$	25,000		$	30,000
Interest-bearing deposits	2,117,658			2,700,645			2,594,170
Total liquidity assets	$	2,142,658		$	2,725,645		$	2,624,170
Total liquidity assets as a percent of:
Total loans held for investment, excluding mortgage finance loans	15.0		%	21.0		%	21.0		%
Total loans held for investment	11.0		%	15.6		%	14.8		%
Total earning assets	9.6		%	12.9		%	12.8		%
Total deposits	12.4		%	16.0		%	15.7		%

Our liquidity needs to support growth in loans held for investment have been fulfilled primarily through growth in our core customer deposits. Our goal is to obtain as much of our funding for loans held for investment and other earning assets as possible from deposits of these core customers. These deposits are generated principally through development of long-term relationships with customers, with a significant focus on treasury management products. In addition to deposits from our core customers, we also have access to deposits through brokered customer relationships. For regulatory purposes, these relationship brokered deposits are categorized as brokered deposits; however, since these deposits arise from a customer relationship, which involves extensive treasury services, we consider these deposits to be core deposits for our reporting purposes.

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We also have access to incremental deposits through brokered retail certificates of deposit, or CDs. These traditional brokered deposits are generally of short maturities, 30 to 90 days, and are used to fund temporary differences in the growth in loans balances, including growth in loans held for sale or other specific categories of loans as compared to customer deposits. The following table summarizes our period-end and average year-to-date core customer deposits, relationship brokered deposits and traditional brokered deposits (in millions):

	June 30, 2017			December 31, 2016			June 30, 2016
Deposits from core customers	$	15,766.1		$	15,400.5		$	15,136.3
Deposits from core customers as a percent of total deposits	91.2		%	90.5		%	90.6		%
Relationship brokered deposits	$	1,526.1		$	1,616.3		$	1,567.3
Relationship brokered deposits as a percent of total deposits	8.8		%	9.5		%	9.4		%
Traditional brokered deposits	$	—		$	—		$	—
Traditional brokered deposits as a percent of total deposits	—		%	—		%	—		%
Average deposits from core customers(1)	$	15,700.8		$	15,723.8		$	14,750.9
Average deposits from core customers as a percent of total quarterly average deposits(1)	91.7		%	91.3		%	91.0		%
Average relationship brokered deposits(1)	$	1,426.8		$	1,496.1		$	1,464.4
Average relationship brokered deposits as a percent of total quarterly average deposits(1)	8.3		%	8.7		%	9.0		%
Average traditional brokered deposits(1)	$	—		$	—		$	—
Average traditional brokered deposits as a percent of total quarterly average deposits(1)	—		%	—		%	—		%

(1) Annual averages presented for December 31, 2016.

We have access to sources of traditional brokered deposits that we estimate to be $3.5 billion. Based on our internal guidelines, we have chosen to limit our use of these sources to a lesser amount. Customer deposits (total deposits, including relationship brokered deposits, minus brokered CDs) at June 30, 2017 increased by $275.4 million from December 31, 2016 and increased $588.6 million from June 30, 2016.

We have short-term borrowing sources available to supplement deposits and meet our funding needs. Such borrowings are generally used to fund our mortgage finance assets, due to their liquidity, short duration and interest spreads available. These borrowing sources include Federal funds purchased from our downstream correspondent bank relationships (which consist of banks that are smaller than our bank) and from our upstream correspondent bank relationships (which consist of banks that are larger than our bank), customer repurchase agreements, treasury, tax and loan notes and advances from the FHLB and the Federal Reserve. The following table summarizes our short-term borrowings as of June 30, 2017 (in thousands):

Federal funds purchased	$	457,800
Repurchase agreements	4,424
FHLB borrowings	2,700,000
Line of credit	—
Total short-term borrowings	$	3,162,224
Maximum short-term borrowings outstanding at any month-end during 2017	$	3,162,224

The following table summarizes our other borrowing capacities in excess of balances outstanding at June 30, 2017 (in thousands):

FHLB borrowing capacity relating to loans	$	3,604,741
FHLB borrowing capacity relating to securities	7,414
Total FHLB borrowing capacity	$	3,612,155
Unused Federal funds lines available from commercial banks	$	820,000

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The following table summarizes our long-term borrowings as of June 30, 2017 (in thousands):

Subordinated notes	$	281,225
Trust preferred subordinated debentures	113,406
Total long-term borrowings	$	394,631

At June 30, 2017, we had a revolving, non-amortizing line of credit with a maximum availability of $130.0 million. This line of credit matures on December 19, 2017. The loan proceeds may be used for general corporate purposes including funding regulatory capital infusions into the Bank. The loan agreement contains customary financial covenants and restrictions. As of June 30, 2017 and December 31, 2016, there were no borrowings outstanding.

Our equity capital, including $150 million in preferred stock, averaged $2.1 billion for the six months ended June 30, 2017, as compared to $1.7 billion for the same period in 2016. We have not paid any cash dividends on our common stock since we commenced operations and have no plans to do so in the foreseeable future.

As of June 30, 2017, our capital ratios were above the levels required to be well capitalized. We believe that our earnings, periodic capital raising transactions and the addition of loan and deposit relationships will allow us to continue to grow organically.

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Commitments and Contractual Obligations

The following table presents significant fixed and determinable contractual payment obligations to third parties by payment date. Payments for borrowings do not include interest. Payments related to leases are based on actual payments specified in the underlying contracts. As of June 30, 2017, our significant fixed and determinable contractual obligations to third parties, excluding interest, were as follows (in thousands):

	Within One Year		After One but Within Three Years		After Three but Within Five Years		After Five Years		Total
Deposits without a stated maturity	$	16,837,930	$	—	$	—	$	—	$	16,837,930
Time deposits	431,449		22,234		610		—		454,293
Federal funds purchased and customer repurchase agreements	462,224		—		—		—		462,224
FHLB borrowings	2,700,000		—		—		—		2,700,000
Operating lease obligations(1)	16,494		32,698		26,891		23,643		99,726
Subordinated notes	—		—		—		281,225		281,225
Trust preferred subordinated debentures	—		—		—		113,406		113,406
Total contractual obligations	$	20,448,097	$	54,932	$	27,501	$	418,274	$	20,948,804

(1) Non-balance sheet item.

Critical Accounting Policies

SEC guidance requires disclosure of “critical accounting policies.” The SEC defines “critical accounting policies” as those that are most important to the presentation of a company’s financial condition and results, and require management’s most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain.

We follow financial accounting and reporting policies that are in accordance with accounting principles generally accepted in the United States. The more significant of these policies are summarized in Note 1 - Operations and Summary of Significant Accounting Policies in the accompanying notes to the consolidated financial statements included Annual Report on Form 10-K filed with the SEC on February 17, 2017. Not all significant accounting policies require management to make difficult, subjective or complex judgments. However, the policy noted below could be deemed to meet the SEC’s definition of a critical accounting policy.

Allowance for Loan Losses

Management considers the policies related to the allowance for loan losses as the most critical to the financial statement presentation. The total allowance for loan losses includes activity related to allowances calculated in accordance with Accounting Standards Codification (“ASC”) 310, Receivables, and ASC 450, Contingencies. The allowance for loan losses is established through a provision for credit losses charged to current earnings. The amount maintained in the allowance reflects management’s continuing evaluation of the loan losses inherent in the loan portfolio. The allowance for loan losses is comprised of specific reserves assigned to certain classified loans and general reserves. Factors contributing to the determination of specific reserves include the creditworthiness of the borrower, and more specifically, changes in the expected future receipt of principal and interest payments and/or in the value of pledged collateral. A reserve is recorded when the carrying amount of the loan exceeds the discounted estimated cash flows using the loan’s initial effective interest rate or the fair value of the collateral for certain collateral dependent loans. For purposes of determining the general allowance, the portfolio is segregated by product types in order to recognize differing risk profiles among categories, and then further segregated by credit grades. See “Summary of Loan Loss Experience” above and Note 4 – Loans Held for Investment and Allowance for Loan Losses in the accompanying notes to the consolidated financial statements included elsewhere in this report for further discussion of the risk factors considered by management in establishing the allowance for loan losses.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Market risk is a broad term for the risk of economic loss due to adverse changes in the fair value of a financial instrument. These changes may be the result of various factors, including interest rates, foreign exchange rates, commodity prices, or equity prices. Additionally, the financial instruments subject to market risk can be classified either as held for trading purposes or held for other than trading.

We are subject to market risk primarily through the effect of changes in interest rates on our portfolio of assets held for purposes other than trading. Additionally, we have some market risk relative to commodity prices through our energy lending activities. Petroleum and natural gas commodity prices declined substantially beginning in 2014, and prices have continued to be suppressed through 2017. Such declines in commodity prices have and, if continued, could negatively impact our energy clients' ability to perform on their loan obligations. Management does not currently expect the current decline in commodity prices to have a material adverse effect on our financial position. Foreign exchange rates, commodity prices and/or equity prices do not pose significant market risk to us.

The responsibility for managing market risk rests with the BSMC, which operates under policy guidelines established by our board of directors. The negative acceptable variation in net interest revenue due to a 200 basis point increase or decrease in interest rates is generally limited by these guidelines to plus or minus 5%. These guidelines also establish maximum levels for short-term borrowings, short-term assets and public and brokered deposits. They also establish minimum levels for unpledged assets, among other things. Oversight of our compliance with these guidelines is the ongoing responsibility of the BSMC, with exceptions reported to the Risk Management Committee, and to our board of directors if deemed necessary, on a quarterly basis. Additionally, the Credit Policy Committee ("CPC") specifically manages risk relative to commodity price market risks. The CPC establishes maximum portfolio concentration levels for energy loans as well as maximum advance rates for energy collateral.

Interest Rate Risk Management

Our interest rate sensitivity is illustrated in the following table. The table reflects rate-sensitive positions as of June 30, 2017, and is not necessarily indicative of positions on other dates. The balances of interest rate sensitive assets and liabilities are presented in the periods in which they next reprice to market rates or mature and are aggregated to show the interest rate sensitivity gap. The mismatch between repricings or maturities within a time period is commonly referred to as the “gap” for that period. A positive gap (asset sensitive), where interest-rate sensitive assets exceed interest rate sensitive liabilities, generally will result in the net interest margin increasing in a rising rate environment and decreasing in a falling rate environment. A negative gap (liability sensitive) will generally have the opposite results on the net interest margin. To reflect anticipated prepayments, certain asset and liability categories are shown in the table using estimated cash flows rather than contractual cash flows. The Company employs interest rate floors in certain variable rate loans to enhance the yield on those loans at times when market interest rates are extraordinarily low. The degree of asset sensitivity, spreads on loans and net interest margin may be reduced until rates increase by an amount sufficient to eliminate the effects of floors. The adverse effect of floors as market rates increase may also be offset by the positive gap, the extent to which rates on deposits and other funding sources lag increasing market rates and changes in composition of funding.

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Interest Rate Sensitivity Gap Analysis

June 30, 2017

(In thousands)

	0-3 mo Balance		4-12 mo Balance		1-3 yr Balance		3+ yr Balance		Total Balance
Assets:
Interest-bearing deposits, federal funds sold and securities purchased under resale agreements	$	2,142,658	$	—	—		$	—	$	2,142,658
Securities(1)	98,977		6,581		1,261		12,224		119,043
Total variable loans	17,337,176		36,545		—		—		17,373,721
Total fixed loans	494,779		1,403,603		732,273		402,527		3,033,182
Total loans(2)	17,831,955		1,440,148		732,273		402,527		20,406,903
Total interest sensitive assets	$	20,073,590	$	1,446,729	$	733,534	$	414,751	$	22,668,604
Liabilities:
Interest-bearing customer deposits	$	8,663,100	$	—	$	—	$	—	$	8,663,100
CDs & IRAs	210,312		221,137		22,234		610		454,293
Traditional brokered deposits	—		—		—		—		—
Total interest-bearing deposits	8,873,412		221,137		22,234		610		9,117,393
Repurchase agreements, Federal funds      purchased, FHLB borrowings, line      of credit	3,162,224		—		—		—		3,162,224
Subordinated notes	—		—		—		281,225		281,225
Trust preferred subordinated debentures	—		—		—		113,406		113,406
Total borrowings	3,162,224		—		—		394,631		3,556,855
Total interest sensitive liabilities	$	12,035,636	$	221,137	$	22,234	$	395,241	$	12,674,248
Gap	$	8,037,954	$	1,225,592	$	711,300	$	19,510	$	—
Cumulative Gap	8,037,954		9,263,546		9,974,846		9,994,356		9,994,356
Demand deposits									$	8,174,830
Stockholders’ equity									2,100,553
Total									$	10,275,383

(1) Securities based on fair market value.

(2) Loans are stated at gross.

The table above sets forth the balances as of June 30, 2017 for interest-bearing assets, interest-bearing liabilities, and the total of non-interest-bearing deposits and stockholders’ equity. While a gap interest table is useful in analyzing interest rate sensitivity, an interest rate sensitivity simulation provides a better illustration of the sensitivity of earnings to changes in interest rates. Earnings are also affected by changing interest rates on the value of funding derived from demand deposits and stockholders’ equity. We perform a sensitivity analysis to identify interest rate risk exposure on net interest income. We quantify and measure interest rate risk exposure using a model to dynamically simulate the effect of changes in net interest income relative to changes in interest rates and loan and deposit account balances over the next twelve months based on three interest rate scenarios. These are a “most likely” rate scenario and two “shock test” scenarios.

The “most likely” rate scenario is based on the consensus forecast of future interest rates published by independent sources. These forecasts incorporate future spot rates and relevant spreads of instruments that are actively traded in the open market. The Federal Reserve’s Federal funds target affects short-term borrowing rates; the prime lending rate and LIBOR are the basis for most of our variable-rate loan pricing. The 10-year mortgage rate is also monitored because of its effect on prepayment speeds for mortgage-backed securities. We believe these are our primary interest rate exposures. We are not currently using derivatives to manage our interest rate exposure.

46

The two “shock test” scenarios assume a sustained parallel 100 and 200 basis point increase in interest rates. As short-term rates have remained low through 2016 and the first six months of 2017, we do not believe that analysis of an assumed decrease in interest rates would provide meaningful results. We will continue to evaluate these scenarios as interest rates change, until short-term rates rise above 3.0%, at which point we will resume evaluations of shock scenarios in which interest rates decrease.

Our interest rate risk exposure model incorporates assumptions regarding the level of interest rate or balance changes on indeterminable maturity deposits (demand deposits, interest-bearing transaction accounts and savings accounts) for a given level of market rate changes. These assumptions have been developed through a combination of historical analysis and future expected pricing behavior. Changes in prepayment behavior of mortgage-backed securities and residential and commercial mortgage loans in each rate environment are captured using industry estimates of prepayment speeds for various coupon segments of the portfolio. The impact of planned growth and new business activities is factored into the simulation model. This modeling indicated interest rate sensitivity as follows (in thousands):

	Anticipated Impact Over the Next Twelve Months as Compared to Most Likely Scenario				Anticipated Impact Over the Next Twelve Months as Compared to Most Likely Scenario
	100 bp Increase		200 bp Increase		100 bp Increase		200 bp Increase
	June 30, 2017				June 30, 2016
Change in net interest income	$	119,929	$	241,922	$	110,368	$	228,444

The simulations used to manage market risk are based on numerous assumptions regarding the effect of changes in interest rates on the timing and extent of repricing characteristics, future cash flows and customer behavior. These assumptions are inherently uncertain and, as a result, the model cannot precisely estimate net interest income or precisely predict the impact of higher or lower interest rates on net interest income. Actual results may differ from simulated results due to timing, magnitude and frequency of interest rate changes as well as changes in market conditions and management strategies, among other factors.

47

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the supervision and participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act of 1934, as amended) as of the end of the period covered by this report. Based upon that evaluation, we have concluded that, as of the end of such period, our disclosure controls and procedures were effective in recording, processing, summarizing and reporting, on a timely basis, information required to be disclosed by us in the reports that we file or submit under the Exchange Act and were effective in ensuring that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is accumulated and communicated to the Company’s management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) during the period covered by this report that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II—OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are subject to various claims and legal actions related to operating activities that arise in the ordinary course of business. Management does not currently expect the ultimate disposition of these matters to have a material adverse impact on our financial statements.

ITEM 1A. RISK FACTORS

There have been no material changes in the risk factors previously disclosed in the Company’s 2016 Form 10-K for the fiscal year ended December 31, 2016.

48

ITEM 5. OTHER INFORMATION

On July 18, 2017, in connection with Julie Anderson’s promotion to Chief Financial Officer, the Company’s Board of Directors approved the grant of 3,205 restricted stock units to Ms. Anderson, which will vest at 20% per year over a five-year period beginning on the first anniversary of the grant date. The award was granted pursuant to the Company's 2015 Long-Term Incentive Plan.

ITEM 6. EXHIBITS

(a)	Exhibits
	10.1*	Retirement Transition and Award Agreement dated May 30, 2017, between Texas Capital Bancshares, Inc. and Peter Bartholow, which is incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K dated May 30, 2017.
	10.2*	Amended and Restated Executive Employment Agreement dated May 30, 2017, between Texas Capital Bancshares, Inc. and Julie Anderson, which is incorporated by reference to Exhibit 10.2 to our Current Report on Form 8-K dated May 30, 2017.
	31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
	31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
	32.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
	32.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
	101	The following materials from Texas Capital Bancshares, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2017, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Statements of Income, (ii) Consolidated Balance Sheets, (iii) Consolidated Statements of Cash Flows, and (iv) Notes to Consolidated Financial Statements

* Denotes management contract or compensatory plan.

49

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

TEXAS CAPITAL BANCSHARES, INC.

Date: July 20, 2017

/s/ Julie Anderson

Julie Anderson

Chief Financial Officer

(Duly authorized officer and principal financial officer)

50

EXHIBIT INDEX

Exhibit Number
10.1*	Retirement Transition and Award Agreement dated May 30, 2017, between Texas Capital Bancshares, Inc. and Peter Bartholow, which is incorporated by reference to Exhibit 10.1 to our Current Report on Form 8-K dated May 30, 2017.
10.2*	Amended and Restated Executive Employment Agreement dated May 30, 2017, between Texas Capital Bancshares, Inc. and Julie Anderson, which is incorporated by reference to Exhibit 10.2 to our Current Report on Form 8-K dated May 30, 2017.
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a) of the Exchange Act, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002, filed herewith.
32.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
32.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(b) of the Exchange Act and 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, furnished herewith.
101	The following materials from Texas Capital Bancshares, Inc.’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2017, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Statements of Income, (ii) Consolidated Balance Sheets, (iii) Consolidated Statements of Cash Flows, and (iv) Notes to Consolidated Financial Statements

* Denotes management contract or compensatory plan.

51

EX-31.1

EXHIBIT 31.1

CERTIFICATION

I, C. Keith Cargill, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Texas Capital Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 20, 2017

/s/ C. Keith Cargill

C. Keith Cargill

Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION

I, Julie Anderson, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Texas Capital Bancshares, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal controls over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: July 20, 2017

/s/ Julie Anderson

Julie Anderson

Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION

In connection with the Quarterly Report on Form 10-Q of Texas Capital Bancshares, Inc. (the “Company”) for the period ending June 30, 2017 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, C. Keith Cargill, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1. The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2. The information contained in the Report, fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ C. Keith Cargill

C. Keith Cargill

Chief Executive Officer

Date: July 20, 2017

EX-32.2

EXHIBIT 32.2

CERTIFICATION

In connection with the Quarterly Report on Form 10-Q of Texas Capital Bancshares, Inc. (the “Company”) for the period ending June 30, 2017 (the “Report”), as filed with the Securities and Exchange Commission on the date hereof, I, Julie Anderson, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1 The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2 The information contained in the Report, fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Julie Anderson

Julie Anderson

Chief Financial Officer

Date: July 20, 2017

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 19, 2017
Document And Entity Information [Abstract]
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	0001077428
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		49,600,286

XML

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 126,977	$ 113,707
Interest-bearing deposits	2,117,658	2,700,645
Federal funds sold and securities purchased under resale agreements	25,000	25,000
Securities, available-for-sale	119,043	24,874
Loans held for sale ($843.2 million and $968.9 million at June 30, 2017 and December 31, 2016, respectively, at fair value )	846,017	968,929
Loans held for investment, mortgage finance	5,183,600	4,497,338
Loans held for investment (net of unearned income)	14,280,353	13,001,011
Less: Allowance for loan losses	174,225	168,126
Loans held for investment, net	19,289,728	17,330,223
Mortgage servicing rights, net	63,023	28,536
Premises and equipment, net	20,750	19,775
Accrued interest receivable and other assets	492,240	465,933
Goodwill and intangible assets, net	19,277	19,512
Total assets	23,119,713	21,697,134
Non-interest-bearing
Non-interest-bearing	8,174,830	7,994,201
Interest-bearing	9,117,393	9,022,630
Total deposits	17,292,223	17,016,831
Accrued interest payable	6,246	5,498
Other liabilities	163,836	161,223
Federal funds purchased and repurchase agreements	462,224	109,575
Other borrowings	2,700,000	2,000,000
Subordinated notes, net	281,225	281,044
Trust preferred subordinated debentures	113,406	113,406
Total liabilities	21,019,160	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, 2017 and December 31, 2016, respectively	150,000	150,000
Common stock, $.01 par value; Authorized shares - 100,000,000; Issued shares – 45,595,669 and 49,504,079 at June 30, 2017 and December 31, 2016, respectively	496	495
Additional paid-in capital	957,721	955,468
Retained earnings	991,949	903,187
Treasury stock (shares at cost: 417 at June 30, 2017 and December 31, 2016)	(8)	(8)
Accumulated other comprehensive income, net of taxes	395	415
Total stockholders’ equity	2,100,553	2,009,557
Total liabilities and stockholders’ equity	$ 23,119,713	$ 21,697,134

XML

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Loans held for sale	$ 843,164	$ 968,929
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	49,595,669	49,504,079
Treasury Stock, shares	417	417

XML

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Interest income
Interest and fees on loans	$ 201,646	$ 168,064	$ 378,270	$ 323,949
Securities	287	246	512	507
Federal funds sold and securities purchased under resale agreements	434	382	964	754
Deposits in other banks	5,824	3,750	12,391	7,035
Total interest income	208,191	172,442	392,137	332,245
Interest expense
Deposits	16,533	8,971	29,826	17,793
Federal funds purchased	726	110	978	236
Other borrowings	2,901	1,367	4,922	2,532
Subordinated notes	4,191	4,191	8,382	8,382
Trust preferred subordinated debentures	881	734	1,711	1,450
Total interest expense	25,232	15,373	45,819	30,393
Net interest income	182,959	157,069	346,318	301,852
Provision for credit losses	13,000	16,000	22,000	46,000
Net interest income after provision for credit losses	169,959	141,069	324,318	255,852
Non-interest income
Service charges on deposit accounts	3,067	2,411	6,112	4,521
Wealth management and trust fee income	1,402	1,098	2,759	1,911
Bank owned life insurance (BOLI) income	481	536	947	1,072
Brokered loan fees	5,809	5,864	11,487	10,509
Servicing income	3,700	50	5,901	(5)
Swap fees	954	1,105	2,757	1,412
Other	3,356	2,868	5,916	5,809
Total non-interest income	18,769	13,932	35,879	25,229
Non-interest expense
Salaries and employee benefits	63,154	54,810	126,157	106,182
Net occupancy expense	6,515	5,838	12,626	11,650
Marketing	6,157	4,486	11,107	8,394
Legal and professional	7,127	6,226	14,580	11,550
Communications and technology	11,906	6,391	18,412	12,608
FDIC insurance assessment	4,603	6,043	10,597	11,512
Servicing related expenses	2,682	612	4,432	685
Other	9,670	9,849	19,997	18,494
Total non-interest expense	111,814	94,255	217,908	181,075
Income before income taxes	76,914	60,746	142,289	100,006
Income tax expense	25,819	21,866	48,652	35,998
Net income	51,095	38,880	93,637	64,008
Preferred stock dividends	2,437	2,437	4,875	4,875
Net income available to common stockholders	48,658	36,443	88,762	59,133
Other comprehensive income (loss)
Change in net unrealized gain on available-for-sale securities arising during period, before-tax	(33)	(22)	(30)	(58)
Income tax benefit related to net unrealized gain on available-for-sale securities	(11)	(8)	(10)	(20)
Other comprehensive loss, net of tax	(22)	(14)	(20)	(38)
Comprehensive income	$ 51,073	$ 38,866	$ 93,617	$ 63,970
Basic earnings per common share (usd per share)	$ 0.98	$ 0.79	$ 1.79	$ 1.29
Diluted earnings per common share (usd per share)	$ 0.97	$ 0.78	$ 1.77	$ 1.27

XML

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	64,008				64,008
Change in unrealized gain on available-for-sale securities, net of taxes	(38)						(38)
Total comprehensive income	63,970
Tax benefit related to exercise of stock-based awards	450			450
Stock-based compensation expense recognized in earnings	2,243			2,243
Preferred stock dividend	(4,875)				(4,875)
Issuance of stock related to stock-based awards - value	(586)		$ (1)	(587)
Issuance of stock related to stock-based awards - shares			79,104
Stockholders' equity, ending balance at Jun. 30, 2016	1,684,735	$ 150,000	$ 460	716,652	816,951	$ (8)	680
Shares, outstanding, ending balance at Jun. 30, 2016		6,000,000	45,953,328.000			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	93,637				93,637
Change in unrealized gain on available-for-sale securities, net of taxes	(20)						(20)
Total comprehensive income	93,617
Stock-based compensation expense recognized in earnings	3,461			3,461
Preferred stock dividend	(4,875)				(4,875)
Issuance of stock related to stock-based awards - value	(1,207)		$ (1)	(1,208)
Issuance of stock related to stock-based awards - shares			57,995
Stockholders' equity, ending balance at Jun. 30, 2017	2,100,553	$ 150,000	$ 496	957,721	$ 991,949	$ (8)	$ 395
Shares, outstanding, ending balance at Jun. 30, 2017		6,000,000	49,595,669.000			417.000
Comprehensive income:
Stock Issued During Period, Shares, Other			33,595
Stock Issued During Period, Value, Other	$ 0		$ 0	$ 0

XML

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parentheticals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Stockholders' Equity [Abstract]
Income tax benefit related to net unrealized gain on available-for-sale securities	$ (11)	$ (8)	$ (10)	$ (20)

XML

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Income from continuing operations	$ 93,637	$ 64,008
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	22,000	46,000
Depreciation and amortization	12,346	10,446
Increase in valuation allowance on mortgage servicing rights	0	414
Bank owned life insurance (BOLI) income	(947)	(1,072)
Stock-based compensation expense	8,954	3,725
Excess tax benefits from stock-based compensation arrangements	0	(553)
Purchases and originations of loans held for sale	(2,843,690)	(876,516)
Proceeds from sales and repayments of loans held for sale	2,939,002	734,964
Loss on sale of loans held for sale and other assets	93	12
Technology write-off	5,285	0
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	(46,025)	(71,805)
Accrued interest payable and other liabilities	(488)	23,094
Net cash provided by (used in) operating activities	190,167	(67,283)
Investing activities
Purchases of available-for-sale securities	(96,871)	(783)
Maturities and calls of available-for-sale securities	275	265
Principal payments received on available-for-sale securities	2,397	3,080
Originations of mortgage finance loans	(37,251,933)	(45,811,787)
Proceeds from pay-offs of mortgage finance loans	36,565,671	45,518,036
Net increase in loans held for investment, excluding mortgage finance loans	(1,297,460)	(794,749)
Purchase of premises and equipment, net	(4,194)	(1,166)
Proceeds from sale of foreclosed assets	272	62
Net cash used in investing activities	(2,081,843)	(1,087,042)
Financing activities
Net increase in deposits	275,392	1,618,946
Costs from issuance of stock related to stock-based awards and warrants	(1,207)	(586)
Preferred dividends paid	(4,875)	(4,875)
Net increase in other borrowings	700,000	519,463
Excess tax benefits from stock-based compensation arrangements	0	553
Net increase (decrease) in Federal funds purchased and repurchase agreements	352,649	(47,069)
Net cash provided by (used in) financing activities	1,321,959	2,086,432
Net increase (decrease) in cash and cash equivalents	(569,717)	932,107
Cash and cash equivalents at beginning of period	2,839,352	1,790,870
Cash and cash equivalents at end of period	2,269,635	2,722,977
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	45,071	30,151
Cash paid during the period for income taxes	52,042	43,309
Transfers from loans/leases to OREO and other repossessed assets	$ 0	$ 18,540

XML

OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 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 value of mortgage servicing rights ("MSRs") and the status of contingencies are particularly susceptible to significant change.

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EARNINGS PER COMMON SHARE

6 Months Ended

Jun. 30, 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   June 30,				Six months ended   June 30,
	2017		2016		2017		2016
Numerator:
Net income	$	51,095	$	38,880	$	93,637	$	64,008
Preferred stock dividends	2,437		2,437		4,875		4,875
Net income available to common stockholders	48,658		36,443		$	88,762	59,133
Denominator:
Denominator for basic earnings per share— weighted average shares	49,576,837		45,924,281		49,556,393		45,906,508
Effect of employee stock-based awards(1)	224,306		124,974		244,058		121,524
Effect of warrants to purchase common stock	428,527		388,877		432,660		368,574
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,229,670		46,438,132		50,233,111		46,396,606
Basic earnings per common share	$	0.98	$	0.79	$	1.79	$	1.29
Diluted earnings per common share	$	0.97	$	0.78	$	1.77	$	1.27

(1) SARs and RSUs outstanding of 6,200 at June 30, 2017 and 252,754 at June 30, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

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SECURITIES

6 Months Ended

Jun. 30, 2017

Available-for-sale Securities [Abstract]

SECURITIES

SECURITIES

The following is a summary of available-for-sale securities (in thousands):

	June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale securities:
U.S. Treasuries	$	94,360	$	—	$	(5	)	$	94,355
Residential mortgage-backed securities	12,284		832		—			13,116
Equity securities(1)	11,790		150		(368		)	11,572
	$	118,434	$	982	$	(373	)	$	119,043
	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):

	June 30, 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	$	94,360		$	—		$	—		$	—		$	94,360
Estimated fair value	94,355			—			—			—			94,355
Weighted average yield(3)	0.92		%	—		%	—		%	—		%	0.92		%
Residential mortgage-backed securities:(1)
Amortized cost	423			723			2,697			8,441			12,284
Estimated fair value	433			748			2,999			8,936			13,116
Weighted average yield(3)	4.70		%	4.72		%	5.55		%	3.00		%	3.40		%
Equity securities:(4)
Amortized cost	11,790			—			—			—			11,790
Estimated fair value	11,572			—			—			—			11,572
Total available-for-sale securities:
Amortized cost													$	118,434
Estimated fair value													$	119,043

	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 June 30, 2017, securities with carrying values of $91.5 million and $8.5 million were pledged to secure certain deposits and repurchase agreements, respectively.

The following table discloses, as of June 30, 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):

June 30, 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	$	82,380	$	(5	)	$	—	$	—		$	82,380	$	(5	)
Equity securities(1)	1,021		—			6,132		(368		)	7,153		(368		)
	$	83,401	$	(5	)	$	6,132	$	(368	)	$	89,533	$	(373	)
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	)

(1) Less than 12 months unrealized loss amount not meaningful.

At June 30, 2017, we owned six securities in an unrealized loss position, four 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 securities are publicly traded equity funds and are subject to market pricing volatility. We do not believe these unrealized losses are “other-than-temporary” as of June 30, 2017. 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 we have the ability and intent to hold the investments until recovery of fair value.

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LOANS AND ALLOWANCE FOR LOAN LOSSES

6 Months Ended

Jun. 30, 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 June 30, 2017 and December 31, 2016, loans held for investment were as follows (in thousands):

	June 30, 2017			December 31, 2016
Commercial	$	8,250,952		$	7,291,545
Mortgage finance	5,183,600			4,497,338
Construction	2,242,562			2,098,706
Real estate	3,569,787			3,462,203
Consumer	39,122			34,587
Leases	274,863			185,529
Gross loans held for investment	19,560,886			17,569,908
Deferred income (net of direct origination costs)	(96,933		)	(71,559		)
Allowance for loan losses	(174,225		)	(168,126		)
Total loans held for investment	$	19,289,728		$	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 June 30, 2017 and December 31, 2016 are stated net of $234.1 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 June 30, 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 general reserves, 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 June 30, 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 June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	7,984,302	$	5,183,600	$	2,236,870	$	3,523,118	$	38,637	$	254,772	$	19,221,299
Special mention	43,223		—		5,692		26,290		369		2,666		78,240
Substandard-accruing	103,859		—		—		16,217		116		17,425		137,617
Non-accrual	119,568		—		—		4,162		—		—		123,730
Total loans held for investment	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886
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 six months ended June 30, 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.

June 30, 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	19,384		—		680			3,436			287			2,989			(2,559		)	24,217
Charge-offs	21,543		—		—			40			180			—			—			21,763
Recoveries	3,442		—		101			53			41			8			—			3,645
Net charge-offs (recoveries)	18,101		—		(101		)	(13		)	139			(8		)	—			18,118
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
Period end amount allocated to:
Loans individually evaluated for impairment	$	28,382	$	—	$	—		$	180		$	—		$	—		$	—		$	28,562
Loans collectively evaluated for impairment	101,669		—		13,925			22,418			389			4,121			3,141			145,663
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
June 30, 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	44,324		—		758			1,423			(28		)	(2,531		)	1,710			45,656
Charge-offs	24,287		—		—			528			—			—			—			24,815
Recoveries	5,334		—		34			21			11			45			—			5,445
Net charge-offs (recoveries)	18,953		—		(34		)	507			(11		)	(45		)	—			19,370
Ending balance	$	137,817	$	—	$	7,628		$	14,297		$	321		$	1,445		$	5,889		$	167,397
Period end amount allocated to:
Loans individually evaluated for impairment	$	30,775	$	—	$	—		$	196		$	—		$	—		$	—		$	30,971
Loans collectively evaluated for impairment	107,042		—		7,628			14,101			321			1,445			5,889			136,426
Ending balance	$	137,817	$	—	$	7,628		$	14,297		$	321		$	1,445		$	5,889		$	167,397

The table below presents the activity in the portion of the allowance for credit losses related to losses on unfunded commitments for the three and six months ended June 30, 2017 and 2016 (in thousands). This liability is recorded in other liabilities in the consolidated balance sheet.

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Beginning balance	$	10,847		$	10,216		$	11,422		$	9,011
Provision for off-balance sheet credit losses	(1,642		)	(861		)	(2,217		)	344
Ending balance	$	9,205		$	9,355		$	9,205		$	9,355

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 June 30, 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.

Our recorded investment in loans as of June 30, 2017, December 31, 2016 and June 30, 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):

June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	120,770	$	—	$	—	$	4,514	$	—	$	—	$	125,284
Loans collectively evaluated for impairment	8,130,182		5,183,600		2,242,562		3,565,273		39,122		274,863		19,435,602
Total	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886
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
June 30, 2016
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	164,339	$	—	$	—	$	4,210	$	—	$	—	$	168,549
Loans collectively evaluated for impairment	7,014,025		5,260,027		2,023,725		3,224,643		26,283		103,565		17,652,268
Total	$	7,178,364	$	5,260,027	$	2,023,725	$	3,228,853	$	26,283	$	103,565	$	17,820,817

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 June 30, 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 June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	21,624	$	23,873	$	—	$	24,135	$	—
Energy	36,577		47,821		—		41,206		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	2,591		2,591		—		2,435		—
Secured by 1-4 family	—		—		—		—		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	60,792	$	74,285	$	—	$	67,776	$	—
With an allowance recorded:
Commercial
Business loans	$	16,510	$	17,330	$	2,908	$	21,320	$	—
Energy	46,059		59,761		25,474		58,030		6
Construction
Market risk	—		—		—		53		—
Real estate
Market risk	352		352		8		1,009		—
Commercial	—		—		—		—		—
Secured by 1-4 family	1,571		1,571		172		1,153		—
Consumer	—		—		—		133		—
Leases	—		—		—		55		—
Total impaired loans with an allowance recorded	$	64,492	$	79,014	$	28,562	$	81,753	$	6
Combined:
Commercial
Business loans	$	38,134	$	41,203	$	2,908	$	45,455	$	—
Energy	82,636		107,582		25,474		99,236		6
Construction
Market risk	—		—		—		53		—
Real estate
Market risk	352		352		8		1,009		—
Commercial	2,591		2,591		—		2,435		—
Secured by 1-4 family	1,571		1,571		172		1,153		—
Consumer	—		—		—		133		—
Leases	—		—		—		55		—
Total impaired loans	$	125,284	$	153,299	$	28,562	$	149,529	$	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 six months ended June 30, 2017 and 2016 totaled $149.5 million and $177.5 million, respectively.

The table below provides an age analysis of our loans held for investment as of June 30, 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	$	22,321	$	6,988	$	9,340	$	38,649	$	36,932	$	7,205,942	$	7,281,523
Energy	1,579		—		—		1,579		82,636		885,214		969,429
Mortgage finance loans	—		—		—		—		—		5,183,600		5,183,600
Construction
Market risk	—		—		—		—		—		2,216,582		2,216,582
Secured by 1-4 family	—		—		—		—		—		25,980		25,980
Real estate
Market risk	3,899		—		1,630		5,529		—		2,597,565		2,603,094
Commercial	536		10,778		—		11,314		2,591		713,946		727,851
Secured by 1-4 family	5,221		57		107		5,385		1,571		231,886		238,842
Consumer	—		—		—		—		—		39,122		39,122
Leases	117		—		—		117		—		274,746		274,863
Total loans held for investment	$	33,673	$	17,823	$	11,077	$	62,573	$	123,730	$	19,374,583	$	19,560,886

(1) Loans past due 90 days and still accruing includes premium finance loans of $6.3 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 June 30, 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 June 30, 2017 and December 31, 2016, $16.7 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 six months ended June 30, 2017 and 2016, loans that were restructured during 2017 and 2016 (in thousands):

June 30, 2017
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,070	$	700
Commercial business loans	1	$	599	$	672
Total new restructured loans in 2017	2	$	1,669	$	1,372
June 30, 2016
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	2	$	14,235	$	14,054
Total new restructured loans in 2016	2	$	14,235	$	14,054

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 June 30, 2017 or 2016.

The following table provides information on how restructured loans were modified during the six months ended June 30, 2017 and 2016 (in thousands):

	Six months ended June 30,
	2017		2016
Extended maturity	$	700	$	—
Adjusted payment schedule	—		12,735
Combination of maturity extension and payment schedule adjustment	—		1,319
Other	672		—
Total	$	1,372	$	14,054

As of June 30, 2017 and 2016, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

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OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO

6 Months Ended

Jun. 30, 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 June 30,					Six months ended June 30,
	2017			2016		2017			2016
Beginning balance	$	18,833		$	17,585	$	18,961		$	278
Additions	—			1,142		—			18,540
Sales	(144		)	—		(272		)	(91		)
Ending balance	$	18,689		$	18,727	$	18,689		$	18,727

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 and charged to other non-interest expense. We did not record a valuation allowance during the six months endedJune 30, 2017 and 2016.

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CERTAIN TRANSFERS OF FINANCIAL ASSETS

6 Months Ended

Jun. 30, 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. Gains and losses on the sale of mortgage loans held for sale and changes in the fair value of the loans held for sale are included in other non-interest income on the consolidated income statement.

Residential mortgage loans held for sale 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 June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017			December 31, 2016
Outstanding balance(1)	$	844,728		$	980,414
Fair value(1)	843,164			968,929
Fair value over/(under) outstanding balance	$	(1,564	)	$	(11,485	)

(1) Does not include $2.9 million of loans held for sale carried at lower of cost or market.

No loans held for sale were 90 days or more past due or on non-accrual as of June 30, 2017 and December 31, 2016.

The table below presents a reconciliation of the changes in loans held for sale for the six months endedJune 30, 2017 and 2016 (in thousands):

	Six months ended June 30,
	2017			2016
Beginning balance	$	968,929		$	86,075
Loans purchased	2,843,690			876,516
Payments and loans sold	(2,976,523		)	(743,769		)
Change in fair value	9,921			2,525
Ending balance	$	846,017		$	221,347

(1) Includes $2.9 million of loans held for sale carried at lower of cost or market.

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 six months endedJune 30, 2017 and 2016 is as follows (in thousands):

	Six months ended June 30,
	2017			2016
Servicing asset:
Balance, beginning of year(1)	$	28,536		$	423
Capitalized servicing rights	37,343			8,805
Amortization	(2,856		)	(271		)
Balance, end of period	$	63,023		$	8,957
Valuation allowance:
Balance, beginning of year	$	—		$	—
Increase in valuation allowance	—			414
Balance, end of period	$	—		$	414
Servicing asset, net(1)	$	63,023		$	8,543
Fair value	$	64,889		$	8,543

(1) MSRs are reported on the consolidated balance sheets at lower of amortized cost or market.

At June 30, 2017 and December 31, 2016, our servicing portfolio of residential mortgage loans sold had an outstanding principal balance of $5.0 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 $33.8 million at June 30, 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 June 30, 2017 and December 31, 2016, management used the following assumptions to determine the fair value of MSRs:

	June 30, 2017		December 31, 2016
Average discount rates	9.91	%	9.96	%
Expected prepayment speeds	8.98	%	7.91	%
Weighted average life, in years	7.5		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):

	June 30, 2017			December 31, 2016
50 bp adverse change in prepayment speed	$	(7,891	)	$	(2,833	)
100 bp adverse change in prepayment speed	(18,537		)	(6,812		)

These sensitivities are hypothetical and actual results may differ materially due to a number of factors. The effect on fair value of a 10% variation in assumptions generally cannot be determined 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.

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 six months endedJune 30, 2017 and 2016. The historical industry data loss factors and experienced losses are accumulated for each sale vintage and applied to more recent sale vintages to estimate inherent losses not yet realized. Our estimated exposure related to these loans was $1.1 million at June 30, 2017 and $363,000 at June 30, 2016 and is recorded in other liabilities in the consolidated balance sheets. We had $7,200 in losses due to repurchase, indemnification or make-whole obligations during the six months endedJune 30, 2017 and no losses during the six months ended2016.

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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK

6 Months Ended

Jun. 30, 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):

	June 30, 2017		December 31, 2016
Commitments to extend credit	$	6,241,135	$	5,704,381
Standby letters of credit	183,986		171,266

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REGULATORY MATTERS

6 Months Ended

Jun. 30, 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 June 30, 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 June 30, 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 June 30, 2017:
CET1
Company	$	1,931,595	8.61	%	$	1,290,441	5.75	%	$	1,570,972	7.00	%	N/A	N/A
Bank	1,830,487		8.16	%	1,290,050		5.75	%	1,570,495		7.00	%	1,458,317	6.50	%
Total capital (to risk-weighted assets)
Company	2,654,760		11.83	%	2,075,928		9.25	%	2,356,458		10.50	%	N/A	N/A
Bank	2,395,189		10.68	%	2,075,297		9.25	%	2,355,743		10.50	%	2,243,565	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,190,105		9.76	%	1,627,078		7.25	%	1,907,609		8.50	%	N/A	N/A
Bank	1,988,997		8.87	%	1,626,584		7.25	%	1,907,030		8.50	%	1,794,852	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,190,105		10.28	%	852,102		4.00	%	852,102		4.00	%	N/A	N/A
Bank	1,988,997		9.34	%	851,915		4.00	%	851,915		4.00	%	1,064,894	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 June 30, 2017, our total mortgage finance loans were $5.2 billion compared to the average for the three months ended June 30, 2017 of $3.8 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 six months endedJune 30, 2017 or 2016.

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STOCK-BASED COMPENSATION

6 Months Ended

Jun. 30, 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 June 30, 2017.

	Three months ended June 30,				Six months ended June 30,
(in thousands)	2017		2016		2017		2016
Stock-settled awards:
SARs	$	74	$	77	$	146	$	159
RSUs	1,714		1,030		3,307		2,078
Restricted stock	4		4		8		6
Cash-settled performance units	2,603		2,155		5,493		1,482
Total	$	4,395	$	3,266	$	8,954	$	3,725

(in thousands)	June 30, 2017
Unrecognized compensation expense related to unvested stock-settled awards	$	20,035
Weighted average period over which expense is expected to be recognized, in years	3.2

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FAIR VALUE DISCLOSURES

6 Months Ended

Jun. 30, 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 U.S. Treasuries and 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. 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 using observable market data.

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 June 30, 2017 and December 31, 2016 are as follows (in thousands):

	Fair Value Measurements Using
June 30, 2017	Level 1		Level 2		Level 3
Available-for-sale securities:(1)
U.S. Treasuries	$	94,355	$	—	$	—
Residential mortgage-backed securities	—		13,116		—
Equity securities(2)	4,419		7,153		—
Loans held for sale (3)	—		843,164		—
Loans held for investment(4) (6)	—		—		43,702
OREO(5) (6)	—		—		18,689
Derivative assets(7)	—		28,234		—
Derivative liabilities(7)	—		26,432		—
Non-qualified deferred compensation plan liabilities (8)	4,502		—		—
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, excluding SBA loans, 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 collateral dependent impaired loans and OREO on a nonrecurring basis as described below.

Loans held for investment

At June 30, 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 $43.7 million fair value of loans held for investment at June 30, 2017 reported above includes impaired loans held for investment with a carrying value of $59.3 million that were reduced by specific allowance allocations totaling $15.6 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 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 June 30, 2017 and December 31, 2016, OREO had a carrying value of $18.7 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):

	June 30, 2017				December 31, 2016
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 1 inputs:
Cash and cash equivalents	$	2,269,635	$	2,269,635	$	2,839,352	$	2,839,352
Securities, available-for-sale	98,774		98,774		1,786		1,786
Level 2 inputs:
Securities, available-for-sale	20,269		20,269		23,088		23,088
Loans held for sale	846,017		846,234		968,929		968,929
Derivative assets	28,234		28,234		37,878		37,878
Level 3 inputs:
Loans held for investment, net	19,289,728		19,300,751		17,330,223		17,347,199
Financial liabilities:
Level 2 inputs:
Federal funds purchased	457,800		457,800		101,800		101,800
Customer repurchase agreements	4,424		4,424		7,775		7,775
Other borrowings	2,700,000		2,700,000		2,000,000		2,000,000
Subordinated notes	281,225		341,671		281,044		304,672
Derivative liabilities	26,342		26,342		26,240		26,240
Level 3 inputs:
Deposits	17,292,223		17,296,750		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 U.S. Treasury securities and 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 liabilities 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.

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DERIVATIVE FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 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 and six months ended June 30, 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 and six months ended June 30, 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 June 30, 2017 and December 31, 2016 are presented in the following tables (in thousands):

	June 30, 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	$	1,369,885	$	1,632		$	25,512		$	1,144,367	$	1,754		$	25,421
Commercial loan/lease interest rate caps	266,886		347			2			210,996		819			—
Customer counterparties:
Commercial loan/lease interest rate swaps	1,369,885		25,512			1,632			1,144,367		25,421			1,754
Commercial loan/lease interest rate caps	266,886		2			347			210,996		—			819
Economic hedging interest rate derivatives:
Loan purchase commitments	236,187		209			573			237,805		1,351			—
Forward sales commitments	1,029,400		2,166			—			1,218,000		10,287			—
Gross derivatives			29,868			28,066					39,632			27,994
Offsetting derivative assets/liabilities			(1,634		)	(1,634		)			(1,754		)	(1,754		)
Net derivatives included in the consolidated balance sheets			$	28,234		$	26,432				$	37,878		$	26,240

The weighted average received and paid interest rates for interest rate swaps outstanding at June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017 Weighted Average Interest Rate				December 31, 2016 Weighted Average Interest Rate
	Received		Paid		Received		Paid
Non-hedging interest rate swaps	3.49	%	4.47	%	3.17	%	4.58	%

The weighted average strike rate for outstanding interest rate caps was 2.50% at June 30, 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 $28.2 million at June 30, 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 values. At June 30, 2017, we had $37.0 million in cash collateral pledged for these derivatives, of which $30.9 million was included in interest-bearing deposits and $6.1 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.

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NEW ACCOUNTING PRONOUNCEMENTS

6 Months Ended

Jun. 30, 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 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.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 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 value of mortgage servicing rights ("MSRs") and the status of contingencies are particularly susceptible to significant change.

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EARNINGS PER COMMON SHARE (Tables)

6 Months Ended

Jun. 30, 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   June 30,				Six months ended   June 30,
	2017		2016		2017		2016
Numerator:
Net income	$	51,095	$	38,880	$	93,637	$	64,008
Preferred stock dividends	2,437		2,437		4,875		4,875
Net income available to common stockholders	48,658		36,443		$	88,762	59,133
Denominator:
Denominator for basic earnings per share— weighted average shares	49,576,837		45,924,281		49,556,393		45,906,508
Effect of employee stock-based awards(1)	224,306		124,974		244,058		121,524
Effect of warrants to purchase common stock	428,527		388,877		432,660		368,574
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	50,229,670		46,438,132		50,233,111		46,396,606
Basic earnings per common share	$	0.98	$	0.79	$	1.79	$	1.29
Diluted earnings per common share	$	0.97	$	0.78	$	1.77	$	1.27

(1) SARs and RSUs outstanding of 6,200 at June 30, 2017 and 252,754 at June 30, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

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SECURITIES (Tables)

6 Months Ended

Jun. 30, 2017

Available-for-sale Securities [Abstract]

Schedule of summary of securities

The following is a summary of available-for-sale securities (in thousands):

	June 30, 2017
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available-for-sale securities:
U.S. Treasuries	$	94,360	$	—	$	(5	)	$	94,355
Residential mortgage-backed securities	12,284		832		—			13,116
Equity securities(1)	11,790		150		(368		)	11,572
	$	118,434	$	982	$	(373	)	$	119,043
	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.

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):

	June 30, 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	$	94,360		$	—		$	—		$	—		$	94,360
Estimated fair value	94,355			—			—			—			94,355
Weighted average yield(3)	0.92		%	—		%	—		%	—		%	0.92		%
Residential mortgage-backed securities:(1)
Amortized cost	423			723			2,697			8,441			12,284
Estimated fair value	433			748			2,999			8,936			13,116
Weighted average yield(3)	4.70		%	4.72		%	5.55		%	3.00		%	3.40		%
Equity securities:(4)
Amortized cost	11,790			—			—			—			11,790
Estimated fair value	11,572			—			—			—			11,572
Total available-for-sale securities:
Amortized cost													$	118,434
Estimated fair value													$	119,043

	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 June 30, 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):

June 30, 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	$	82,380	$	(5	)	$	—	$	—		$	82,380	$	(5	)
Equity securities(1)	1,021		—			6,132		(368		)	7,153		(368		)
	$	83,401	$	(5	)	$	6,132	$	(368	)	$	89,533	$	(373	)
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	)

(1) Less than 12 months unrealized loss amount not meaningful.

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Tables)

6 Months Ended

Jun. 30, 2017

Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]

Schedule of loans held for investments

At June 30, 2017 and December 31, 2016, loans held for investment were as follows (in thousands):

	June 30, 2017			December 31, 2016
Commercial	$	8,250,952		$	7,291,545
Mortgage finance	5,183,600			4,497,338
Construction	2,242,562			2,098,706
Real estate	3,569,787			3,462,203
Consumer	39,122			34,587
Leases	274,863			185,529
Gross loans held for investment	19,560,886			17,569,908
Deferred income (net of direct origination costs)	(96,933		)	(71,559		)
Allowance for loan losses	(174,225		)	(168,126		)
Total loans held for investment	$	19,289,728		$	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 June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Grade:
Pass	$	7,984,302	$	5,183,600	$	2,236,870	$	3,523,118	$	38,637	$	254,772	$	19,221,299
Special mention	43,223		—		5,692		26,290		369		2,666		78,240
Substandard-accruing	103,859		—		—		16,217		116		17,425		137,617
Non-accrual	119,568		—		—		4,162		—		—		123,730
Total loans held for investment	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886
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 six months ended June 30, 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.

June 30, 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	19,384		—		680			3,436			287			2,989			(2,559		)	24,217
Charge-offs	21,543		—		—			40			180			—			—			21,763
Recoveries	3,442		—		101			53			41			8			—			3,645
Net charge-offs (recoveries)	18,101		—		(101		)	(13		)	139			(8		)	—			18,118
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
Period end amount allocated to:
Loans individually evaluated for impairment	$	28,382	$	—	$	—		$	180		$	—		$	—		$	—		$	28,562
Loans collectively evaluated for impairment	101,669		—		13,925			22,418			389			4,121			3,141			145,663
Ending balance	$	130,051	$	—	$	13,925		$	22,598		$	389		$	4,121		$	3,141		$	174,225
June 30, 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	44,324		—		758			1,423			(28		)	(2,531		)	1,710			45,656
Charge-offs	24,287		—		—			528			—			—			—			24,815
Recoveries	5,334		—		34			21			11			45			—			5,445
Net charge-offs (recoveries)	18,953		—		(34		)	507			(11		)	(45		)	—			19,370
Ending balance	$	137,817	$	—	$	7,628		$	14,297		$	321		$	1,445		$	5,889		$	167,397
Period end amount allocated to:
Loans individually evaluated for impairment	$	30,775	$	—	$	—		$	196		$	—		$	—		$	—		$	30,971
Loans collectively evaluated for impairment	107,042		—		7,628			14,101			321			1,445			5,889			136,426
Ending balance	$	137,817	$	—	$	7,628		$	14,297		$	321		$	1,445		$	5,889		$	167,397

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 and six months ended June 30, 2017 and 2016 (in thousands). This liability is recorded in other liabilities in the consolidated balance sheet.

	Three months ended June 30,						Six months ended June 30,
	2017			2016			2017			2016
Beginning balance	$	10,847		$	10,216		$	11,422		$	9,011
Provision for off-balance sheet credit losses	(1,642		)	(861		)	(2,217		)	344
Ending balance	$	9,205		$	9,355		$	9,205		$	9,355

Schedule of recorded investment in loans related to each balance in the allowance for loan losses

Our recorded investment in loans as of June 30, 2017, December 31, 2016 and June 30, 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):

June 30, 2017
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	120,770	$	—	$	—	$	4,514	$	—	$	—	$	125,284
Loans collectively evaluated for impairment	8,130,182		5,183,600		2,242,562		3,565,273		39,122		274,863		19,435,602
Total	$	8,250,952	$	5,183,600	$	2,242,562	$	3,569,787	$	39,122	$	274,863	$	19,560,886
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
June 30, 2016
	Commercial		Mortgage Finance		Construction		Real Estate		Consumer		Leases		Total
Loans individually evaluated for impairment	$	164,339	$	—	$	—	$	4,210	$	—	$	—	$	168,549
Loans collectively evaluated for impairment	7,014,025		5,260,027		2,023,725		3,224,643		26,283		103,565		17,652,268
Total	$	7,178,364	$	5,260,027	$	2,023,725	$	3,228,853	$	26,283	$	103,565	$	17,820,817

Schedule of impaired loans, by portfolio class

The following tables detail our impaired loans, by portfolio class, as of June 30, 2017 and December 31, 2016 (in thousands):

June 30, 2017
	Recorded Investment		Unpaid Principal Balance		Related Allowance		Average Recorded Investment		Interest Income Recognized
With no related allowance recorded:
Commercial
Business loans	$	21,624	$	23,873	$	—	$	24,135	$	—
Energy	36,577		47,821		—		41,206		—
Construction
Market risk	—		—		—		—		—
Real estate
Market risk	—		—		—		—		—
Commercial	2,591		2,591		—		2,435		—
Secured by 1-4 family	—		—		—		—		—
Consumer	—		—		—		—		—
Leases	—		—		—		—		—
Total impaired loans with no allowance recorded	$	60,792	$	74,285	$	—	$	67,776	$	—
With an allowance recorded:
Commercial
Business loans	$	16,510	$	17,330	$	2,908	$	21,320	$	—
Energy	46,059		59,761		25,474		58,030		6
Construction
Market risk	—		—		—		53		—
Real estate
Market risk	352		352		8		1,009		—
Commercial	—		—		—		—		—
Secured by 1-4 family	1,571		1,571		172		1,153		—
Consumer	—		—		—		133		—
Leases	—		—		—		55		—
Total impaired loans with an allowance recorded	$	64,492	$	79,014	$	28,562	$	81,753	$	6
Combined:
Commercial
Business loans	$	38,134	$	41,203	$	2,908	$	45,455	$	—
Energy	82,636		107,582		25,474		99,236		6
Construction
Market risk	—		—		—		53		—
Real estate
Market risk	352		352		8		1,009		—
Commercial	2,591		2,591		—		2,435		—
Secured by 1-4 family	1,571		1,571		172		1,153		—
Consumer	—		—		—		133		—
Leases	—		—		—		55		—
Total impaired loans	$	125,284	$	153,299	$	28,562	$	149,529	$	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 June 30, 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	$	22,321	$	6,988	$	9,340	$	38,649	$	36,932	$	7,205,942	$	7,281,523
Energy	1,579		—		—		1,579		82,636		885,214		969,429
Mortgage finance loans	—		—		—		—		—		5,183,600		5,183,600
Construction
Market risk	—		—		—		—		—		2,216,582		2,216,582
Secured by 1-4 family	—		—		—		—		—		25,980		25,980
Real estate
Market risk	3,899		—		1,630		5,529		—		2,597,565		2,603,094
Commercial	536		10,778		—		11,314		2,591		713,946		727,851
Secured by 1-4 family	5,221		57		107		5,385		1,571		231,886		238,842
Consumer	—		—		—		—		—		39,122		39,122
Leases	117		—		—		117		—		274,746		274,863
Total loans held for investment	$	33,673	$	17,823	$	11,077	$	62,573	$	123,730	$	19,374,583	$	19,560,886

(1) Loans past due 90 days and still accruing includes premium finance loans of $6.3 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 six months ended June 30, 2017 and 2016, loans that were restructured during 2017 and 2016 (in thousands):

June 30, 2017
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	1	$	1,070	$	700
Commercial business loans	1	$	599	$	672
Total new restructured loans in 2017	2	$	1,669	$	1,372
June 30, 2016
	Number of Restructured Loans	Balance at Restructure		Balance at Period-End
Energy loans	2	$	14,235	$	14,054
Total new restructured loans in 2016	2	$	14,235	$	14,054

The following table provides information on how restructured loans were modified during the six months ended June 30, 2017 and 2016 (in thousands):

	Six months ended June 30,
	2017		2016
Extended maturity	$	700	$	—
Adjusted payment schedule	—		12,735
Combination of maturity extension and payment schedule adjustment	—		1,319
Other	672		—
Total	$	1,372	$	14,054

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OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO (Tables)

6 Months Ended

Jun. 30, 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 June 30,					Six months ended June 30,
	2017			2016		2017			2016
Beginning balance	$	18,833		$	17,585	$	18,961		$	278
Additions	—			1,142		—			18,540
Sales	(144		)	—		(272		)	(91		)
Ending balance	$	18,689		$	18,727	$	18,689		$	18,727

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 and charged to other non-interest expense. We did not record a valuation allowance during the six months endedJune 30, 2017 and 2016.

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Tables)

6 Months Ended

Jun. 30, 2017

Transfers and Servicing [Abstract]

Schedule of Loans Held for Sale

The table below presents the unpaid principal balance of loans held for sale and related fair values at June 30, 2017 and December 31, 2016 (in thousands):

	June 30, 2017			December 31, 2016
Outstanding balance(1)	$	844,728		$	980,414
Fair value(1)	843,164			968,929
Fair value over/(under) outstanding balance	$	(1,564	)	$	(11,485	)

(1) Does not include $2.9 million of loans held for sale carried at lower of cost or market.

The table below presents a reconciliation of the changes in loans held for sale for the six months endedJune 30, 2017 and 2016 (in thousands):

	Six months ended June 30,
	2017			2016
Beginning balance	$	968,929		$	86,075
Loans purchased	2,843,690			876,516
Payments and loans sold	(2,976,523		)	(743,769		)
Change in fair value	9,921			2,525
Ending balance	$	846,017		$	221,347

(1) Includes $2.9 million of loans held for sale carried at lower of cost or market.

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 six months endedJune 30, 2017 and 2016 is as follows (in thousands):

	Six months ended June 30,
	2017			2016
Servicing asset:
Balance, beginning of year(1)	$	28,536		$	423
Capitalized servicing rights	37,343			8,805
Amortization	(2,856		)	(271		)
Balance, end of period	$	63,023		$	8,957
Valuation allowance:
Balance, beginning of year	$	—		$	—
Increase in valuation allowance	—			414
Balance, end of period	$	—		$	414
Servicing asset, net(1)	$	63,023		$	8,543
Fair value	$	64,889		$	8,543

(1) MSRs are reported on the consolidated balance sheets at lower of amortized cost or market.

Schedule of Fair Value Assumption, Date of Securitization or Asset-backed Financing Arrangement, Transferor's Continuing Involvement, Servicing Assets or Liabilities

As of June 30, 2017 and December 31, 2016, management used the following assumptions to determine the fair value of MSRs:

	June 30, 2017		December 31, 2016
Average discount rates	9.91	%	9.96	%
Expected prepayment speeds	8.98	%	7.91	%
Weighted average life, in years	7.5		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):

	June 30, 2017			December 31, 2016
50 bp adverse change in prepayment speed	$	(7,891	)	$	(2,833	)
100 bp adverse change in prepayment speed	(18,537		)	(6,812		)

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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Tables)

6 Months Ended

Jun. 30, 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):

	June 30, 2017		December 31, 2016
Commitments to extend credit	$	6,241,135	$	5,704,381
Standby letters of credit	183,986		171,266

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REGULATORY MATTERS (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2017:
CET1
Company	$	1,931,595	8.61	%	$	1,290,441	5.75	%	$	1,570,972	7.00	%	N/A	N/A
Bank	1,830,487		8.16	%	1,290,050		5.75	%	1,570,495		7.00	%	1,458,317	6.50	%
Total capital (to risk-weighted assets)
Company	2,654,760		11.83	%	2,075,928		9.25	%	2,356,458		10.50	%	N/A	N/A
Bank	2,395,189		10.68	%	2,075,297		9.25	%	2,355,743		10.50	%	2,243,565	10.00	%
Tier 1 capital (to risk-weighted assets)
Company	2,190,105		9.76	%	1,627,078		7.25	%	1,907,609		8.50	%	N/A	N/A
Bank	1,988,997		8.87	%	1,626,584		7.25	%	1,907,030		8.50	%	1,794,852	8.00	%
Tier 1 capital (to average assets)(1)
Company	2,190,105		10.28	%	852,102		4.00	%	852,102		4.00	%	N/A	N/A
Bank	1,988,997		9.34	%	851,915		4.00	%	851,915		4.00	%	1,064,894	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.

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STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2017

Compensation Related Costs [Abstract]

Schedule of stock-based compensation costs

Stock-based compensation expense presented below consists of awards granted from 2011 through June 30, 2017.

	Three months ended June 30,				Six months ended June 30,
(in thousands)	2017		2016		2017		2016
Stock-settled awards:
SARs	$	74	$	77	$	146	$	159
RSUs	1,714		1,030		3,307		2,078
Restricted stock	4		4		8		6
Cash-settled performance units	2,603		2,155		5,493		1,482
Total	$	4,395	$	3,266	$	8,954	$	3,725

Schedule of unrecognized compensation costs

(in thousands)	June 30, 2017
Unrecognized compensation expense related to unvested stock-settled awards	$	20,035
Weighted average period over which expense is expected to be recognized, in years	3.2

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FAIR VALUE DISCLOSURES (Tables)

6 Months Ended

Jun. 30, 2017

Fair Value Disclosures [Abstract]

Schedule of assets and liabilities measured at fair value

Assets and liabilities measured at fair value at June 30, 2017 and December 31, 2016 are as follows (in thousands):

	Fair Value Measurements Using
June 30, 2017	Level 1		Level 2		Level 3
Available-for-sale securities:(1)
U.S. Treasuries	$	94,355	$	—	$	—
Residential mortgage-backed securities	—		13,116		—
Equity securities(2)	4,419		7,153		—
Loans held for sale (3)	—		843,164		—
Loans held for investment(4) (6)	—		—		43,702
OREO(5) (6)	—		—		18,689
Derivative assets(7)	—		28,234		—
Derivative liabilities(7)	—		26,432		—
Non-qualified deferred compensation plan liabilities (8)	4,502		—		—
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, excluding SBA loans, 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):

	June 30, 2017				December 31, 2016
	Carrying Amount		Estimated Fair Value		Carrying Amount		Estimated Fair Value
Financial assets:
Level 1 inputs:
Cash and cash equivalents	$	2,269,635	$	2,269,635	$	2,839,352	$	2,839,352
Securities, available-for-sale	98,774		98,774		1,786		1,786
Level 2 inputs:
Securities, available-for-sale	20,269		20,269		23,088		23,088
Loans held for sale	846,017		846,234		968,929		968,929
Derivative assets	28,234		28,234		37,878		37,878
Level 3 inputs:
Loans held for investment, net	19,289,728		19,300,751		17,330,223		17,347,199
Financial liabilities:
Level 2 inputs:
Federal funds purchased	457,800		457,800		101,800		101,800
Customer repurchase agreements	4,424		4,424		7,775		7,775
Other borrowings	2,700,000		2,700,000		2,000,000		2,000,000
Subordinated notes	281,225		341,671		281,044		304,672
Derivative liabilities	26,342		26,342		26,240		26,240
Level 3 inputs:
Deposits	17,292,223		17,296,750		17,016,831		17,017,221
Trust preferred subordinated debentures	113,406		113,406		113,406		113,406

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DERIVATIVE FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2017 and December 31, 2016 are presented in the following tables (in thousands):

	June 30, 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	$	1,369,885	$	1,632		$	25,512		$	1,144,367	$	1,754		$	25,421
Commercial loan/lease interest rate caps	266,886		347			2			210,996		819			—
Customer counterparties:
Commercial loan/lease interest rate swaps	1,369,885		25,512			1,632			1,144,367		25,421			1,754
Commercial loan/lease interest rate caps	266,886		2			347			210,996		—			819
Economic hedging interest rate derivatives:
Loan purchase commitments	236,187		209			573			237,805		1,351			—
Forward sales commitments	1,029,400		2,166			—			1,218,000		10,287			—
Gross derivatives			29,868			28,066					39,632			27,994
Offsetting derivative assets/liabilities			(1,634		)	(1,634		)			(1,754		)	(1,754		)
Net derivatives included in the consolidated balance sheets			$	28,234		$	26,432				$	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 June 30, 2017 and December 31, 2016 were as follows:

	June 30, 2017 Weighted Average Interest Rate				December 31, 2016 Weighted Average Interest Rate
	Received		Paid		Received		Paid
Non-hedging interest rate swaps	3.49	%	4.47	%	3.17	%	4.58	%

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EARNINGS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income		$ 51,095	$ 38,880	$ 93,637	$ 64,008
Preferred stock dividends		(2,437)	(2,437)	(4,875)	(4,875)
Net income available to common stockholders		$ 48,658	$ 36,443	$ 88,762	$ 59,133
Denominator:
Denominator for basic earnings per share— weighted average shares		49,576,837	45,924,281	49,556,393	45,906,508
Effect of employee stock-based awards	[1]	224,306	124,974	244,058	121,524
Effect of warrants to purchase common stock		428,527	388,877	432,660	368,574
Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions		50,229,670	46,438,132	50,233,111	46,396,606
Basic earnings per common share (usd per share)		$ 0.98	$ 0.79	$ 1.79	$ 1.29
Diluted earnings per common share (usd per share)		$ 0.97	$ 0.78	$ 1.77	$ 1.27
Stock options, SARs and RSUs excluded from computation of diluted EPS				6,200	252,754

[1] SARs and RSUs outstanding of 6,200 at June 30, 2017 and 252,754 at June 30, 2016 have not been included in diluted earnings per share because to do so would have been anti-dilutive for the periods presented.

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SECURITIES (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Summary of Available-for-Sale Securities
Amortized Cost		$ 118,434	$ 24,235
Gross Unrealized Gains		982	999
Gross Unrealized Losses		(373)	(360)
Estimated Fair Value		119,043	24,874
U.S. Treasuries
Summary of Available-for-Sale Securities
Amortized Cost		94,360
Gross Unrealized Gains		0
Gross Unrealized Losses		(5)
Estimated Fair Value		94,355
Residential mortgage-backed securities
Summary of Available-for-Sale Securities
Amortized Cost	[1]	12,284	14,680
Gross Unrealized Gains		832	972
Gross Unrealized Losses		0	0
Estimated Fair Value	[1]	13,116	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]	11,790	9,280
Gross Unrealized Gains	[3]	150	27
Gross Unrealized Losses	[3]	(368)	(360)
Estimated Fair Value	[3],[4]	$ 11,572	$ 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.

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SECURITIES (Details 1) - USD ($) $ in Thousands		6 Months Ended	12 Months Ended
		Jun. 30, 2017	Dec. 31, 2016
The amortized cost and fair value of available-for-sale securites by maturity
Amortized Cost		$ 118,434	$ 24,235
Estimated Fair Value		$ 119,043	$ 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		$ 94,360
Amortized cost, After One Through Five Years		0
Amortized cost, After Five Through Ten Years		0
Amortized cost, After Ten Years		0
Amortized Cost		94,360
Estimated fair value, Less Than One Year		94,355
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		$ 94,355
Weighted average yield, Less Than One Year		0.92%
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		0.92%
Residential mortgage-backed securities
The amortized cost and fair value of available-for-sale securites by maturity
Amortized cost, Less Than One Year	[1]	$ 423	$ 9
Amortized cost, After One Through Five Years	[1]	723	2,047
Amortized cost, After Five Through Ten Years	[1]	2,697	3,147
Amortized cost, After Ten Years	[1]	8,441	9,477
Amortized Cost	[1]	12,284	14,680
Estimated fair value, Less Than One Year	[1]	433	9
Estimated fair value, After One Through Five Years	[1]	748	2,104
Estimated fair value, After Five Through Ten Years	[1]	2,999	3,495
Estimated fair value, After Ten Years	[1]	8,936	10,044
Estimated Fair Value	[1]	$ 13,116	$ 15,652
Weighted average yield, Less Than One Year	[1],[2]	4.70%	5.50%
Weighted average yield, After One Through Five Years	[1],[2]	4.72%	4.70%
Weighted average yield, After Five Through Ten Years	[1],[2]	5.55%	5.55%
Weighted average yield, After Ten Years	[1],[2]	3.00%	2.84%
Weighted average yield, Total	[1],[2]	3.40%	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	[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]	$ 11,790	$ 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	[4],[5]	11,790	9,280
Estimated fair value, Less Than One Year	[4]	11,572	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]	11,572	$ 8,947
Deposits
Available-for-sale Securities, Other Disclosure Items
Available-for-sale securities pledged as collateral		91,500
Repurchase agreements
Available-for-sale Securities, Other Disclosure Items
Available-for-sale securities pledged as collateral		$ 8,500

[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.

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SECURITIES (Details 2) $ in Thousands	Jun. 30, 2017 USD ($) security		Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (security) | security	6
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair Value, Less Than 12 Months	$ 83,401
Unrealized Loss, Less Than 12 Months	(5)
Fair Value, 12 Months or Longer	6,132
Unrealized Loss, 12 Months or Longer	(368)
Fair Value, Total	89,533
Unrealized Loss, Total	$ (373)
U.S. Treasuries
Schedule of Available-for-sale Securities [Line Items]
Number of securities in unrealized loss positions (security) | security	4
Available-for-sale Securities, Continuous Unrealized Loss Position
Fair Value, Less Than 12 Months	$ 82,380
Unrealized Loss, Less Than 12 Months	(5)
Fair Value, 12 Months or Longer	0
Unrealized Loss, 12 Months or Longer	0
Fair Value, Total	82,380
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	$ 1,021		$ 1,015
Unrealized Loss, Less Than 12 Months	0	[1]	(6)
Fair Value, 12 Months or Longer	6,132		6,146
Unrealized Loss, 12 Months or Longer	(368)	[1]	(354)
Fair Value, Total	7,153		7,161
Unrealized Loss, Total	$ (368)	[1]	$ (360)

[1] Less than 12 months unrealized loss amount not meaningful.

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Loans and Leases Receivable, Net Reported Amount
Commercial	$ 8,250,952	$ 7,291,545
Mortgage finance	5,183,600	4,497,338
Construction	2,242,562	2,098,706
Real estate	3,569,787	3,462,203
Consumer	39,122	34,587
Leases	274,863	185,529
Gross loans held for investment	19,560,886	17,569,908	$ 17,820,817
Deferred income (net of direct origination costs)	(96,933)	(71,559)
Allowance for loan losses	(174,225)	(168,126)	$ (167,397)	$ (141,111)
Loans held for investment, net	19,289,728	17,330,223
Participating mortgage finance loans	$ 234,100	$ 839,000

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LOANS AND ALLOWANCE FOR LOAN LOSSES - Credit Risk Profile (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Commercial	$ 8,250,952	$ 7,291,545
Mortgage finance	5,183,600	4,497,338
Construction	2,242,562	2,098,706
Real estate	3,569,787	3,462,203
Consumer	39,122	34,587
Leases	274,863	185,529
Gross loans held for investment	19,560,886	17,569,908	$ 17,820,817
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial	7,984,302	6,941,310
Mortgage finance	5,183,600	4,497,338
Construction	2,236,870	2,074,859
Real estate	3,523,118	3,430,346
Consumer	38,637	34,249
Leases	254,772	181,914
Gross loans held for investment	19,221,299	17,160,016
Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	43,223	69,447
Mortgage finance	0	0
Construction	5,692	10,901
Real estate	26,290	21,932
Consumer	369	0
Leases	2,666	3,532
Gross loans held for investment	78,240	105,812
Substandard-accruing
Financing Receivable, Recorded Investment [Line Items]
Commercial	103,859	115,848
Mortgage finance	0	0
Construction	0	12,787
Real estate	16,217	7,516
Consumer	116	138
Leases	17,425	0
Gross loans held for investment	137,617	136,289
Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Commercial	119,568	164,940
Mortgage finance	0	0
Construction	0	159
Real estate	4,162	2,409
Consumer	0	200
Leases	0	83
Gross loans held for investment	$ 123,730	$ 167,791

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Reserve for loan losses:
Beginning balance	$ 168,126	$ 141,111
Provision for loan losses	24,217	45,656
Charge-offs	21,763	24,815
Recoveries	3,645	5,445
Net charge-offs (recoveries)	18,118	19,370
Period end amount allocated to:
Loans individually evaluated for impairment			$ 28,562	$ 30,971
Loans collectively evaluated for impairment			145,663	136,426
Ending balance	168,126	141,111	174,225	167,397
Commercial
Reserve for loan losses:
Beginning balance	128,768	112,446
Provision for loan losses	19,384	44,324
Charge-offs	21,543	24,287
Recoveries	3,442	5,334
Net charge-offs (recoveries)	18,101	18,953
Period end amount allocated to:
Loans individually evaluated for impairment			28,382	30,775
Loans collectively evaluated for impairment			101,669	107,042
Ending balance	128,768	112,446	130,051	137,817
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	680	758
Charge-offs	0	0
Recoveries	101	34
Net charge-offs (recoveries)	(101)	(34)
Period end amount allocated to:
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			13,925	7,628
Ending balance	13,144	6,836	13,925	7,628
Real Estate
Reserve for loan losses:
Beginning balance	19,149	13,381
Provision for loan losses	3,436	1,423
Charge-offs	40	528
Recoveries	53	21
Net charge-offs (recoveries)	(13)	507
Period end amount allocated to:
Loans individually evaluated for impairment			180	196
Loans collectively evaluated for impairment			22,418	14,101
Ending balance	19,149	13,381	22,598	14,297
Consumer
Reserve for loan losses:
Beginning balance	241	338
Provision for loan losses	287	(28)
Charge-offs	180	0
Recoveries	41	11
Net charge-offs (recoveries)	139	(11)
Period end amount allocated to:
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			389	321
Ending balance	241	338	389	321
Leases
Reserve for loan losses:
Beginning balance	1,124	3,931
Provision for loan losses	2,989	(2,531)
Charge-offs	0	0
Recoveries	8	45
Net charge-offs (recoveries)	(8)	(45)
Period end amount allocated to:
Loans individually evaluated for impairment			0	0
Loans collectively evaluated for impairment			4,121	1,445
Ending balance	1,124	3,931	4,121	1,445
Unallocated
Reserve for loan losses:
Beginning balance	5,700	4,179
Provision for loan losses	(2,559)	1,710
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			3,141	5,889
Ending balance	$ 5,700	$ 4,179	$ 3,141	$ 5,889

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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Credit Losses Related to Unfunded Commitments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Provision for off-balance sheet credit losses	$ 13,000	$ 16,000	$ 22,000	$ 46,000
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance	10,847	10,216	11,422	9,011
Provision for off-balance sheet credit losses	(1,642)	(861)	(2,217)	344
Ending balance	$ 9,205	$ 9,355	$ 9,205	$ 9,355

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 3) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	$ 125,284	$ 170,862	$ 168,549
Loans collectively evaluated for impairment	19,435,602	17,399,046	17,652,268
Gross loans held for investment	19,560,886	17,569,908	17,820,817
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	120,770	166,669	164,339
Loans collectively evaluated for impairment	8,130,182	7,124,876	7,014,025
Gross loans held for investment	8,250,952	7,291,545	7,178,364
Mortgage finance loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	0	0
Loans collectively evaluated for impairment	5,183,600	4,497,338	5,260,027
Gross loans held for investment	5,183,600	4,497,338	5,260,027
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	159	0
Loans collectively evaluated for impairment	2,242,562	2,098,547	2,023,725
Gross loans held for investment	2,242,562	2,098,706	2,023,725
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	4,514	3,751	4,210
Loans collectively evaluated for impairment	3,565,273	3,458,452	3,224,643
Gross loans held for investment	3,569,787	3,462,203	3,228,853
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	200	0
Loans collectively evaluated for impairment	39,122	34,387	26,283
Gross loans held for investment	39,122	34,587	26,283
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans individually evaluated for impairment	0	83	0
Loans collectively evaluated for impairment	274,863	185,446	103,565
Gross loans held for investment	$ 274,863	$ 185,529	$ 103,565

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 4) - USD ($) $ in Thousands	Jun. 30, 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

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 5) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 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	$ 60,792		72,704
Unpaid principal balance	74,285		84,597
Related allowance	0		0
Average recorded investment	67,776		74,100
Interest income recognized	0		38
With no related allowance recorded: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	21,624		23,868
Unpaid principal balance	23,873		27,992
Related allowance	0		0
Average recorded investment	24,135		12,361
Interest income recognized	0		0
With no related allowance recorded: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	36,577
Unpaid principal balance	47,821		54,522
Related allowance	0		0
Average recorded investment	41,206		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	2,591		2,083
Unpaid principal balance	2,591		2,083
Related allowance	0		0
Average recorded investment	2,435		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	64,492		98,158
Unpaid principal balance	79,014		112,400
Related allowance	28,562		34,605
Average recorded investment	81,753		100,017
Interest income recognized	6		24
With an allowance recorded: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	16,510		21,303
Unpaid principal balance	17,330		21,303
Related allowance	2,908		7,055
Average recorded investment	21,320		22,277
Interest income recognized	0		0
With an allowance recorded: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	46,059		74,745
Unpaid principal balance	59,761		88,987
Related allowance	25,474		27,350
Average recorded investment	58,030		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	53		53
Interest income recognized	0		0
With an allowance recorded: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	352		1,342
Unpaid principal balance	352		1,342
Related allowance	8		20
Average recorded investment	1,009		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	1,571		326
Unpaid principal balance	1,571		326
Related allowance	172		113
Average recorded investment	1,153		435
Interest income recognized	0		0
With an allowance recorded: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	0		200
Unpaid principal balance	0		200
Related allowance	0		30
Average recorded investment	133		67
Interest income recognized	0		0
With an allowance recorded: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	0		83
Unpaid principal balance	0		83
Related allowance	0		13
Average recorded investment	55		548
Interest income recognized	0		0
Combined:
Financing Receivable, Impaired [Line Items]
Recorded investment	125,284		170,862
Unpaid principal balance	153,299		196,997
Related allowance	28,562		34,605
Average recorded investment	149,529	$ 177,500	174,117
Interest income recognized	6		62
Combined: | Commercial business loans | Business loans
Financing Receivable, Impaired [Line Items]
Recorded investment	38,134		45,171
Unpaid principal balance	41,203		49,295
Related allowance	2,908		7,055
Average recorded investment	45,455		34,638
Interest income recognized	0		0
Combined: | Commercial business loans | Energy
Financing Receivable, Impaired [Line Items]
Recorded investment	82,636		121,498
Unpaid principal balance	107,582		143,509
Related allowance	25,474		27,350
Average recorded investment	99,236		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	53		2,831
Interest income recognized	0		0
Combined: | Real estate | Market risk
Financing Receivable, Impaired [Line Items]
Recorded investment	352		1,342
Unpaid principal balance	352		1,342
Related allowance	8		20
Average recorded investment	1,009		3,000
Interest income recognized	0		0
Combined: | Real estate | Commercial
Financing Receivable, Impaired [Line Items]
Recorded investment	2,591		2,083
Unpaid principal balance	2,591		2,083
Related allowance	0		0
Average recorded investment	2,435		4,483
Interest income recognized	0		38
Combined: | Real estate | Secured by 1-4 family
Financing Receivable, Impaired [Line Items]
Recorded investment	1,571		326
Unpaid principal balance	1,571		326
Related allowance	172		113
Average recorded investment	1,153		435
Interest income recognized	0		0
Combined: | Consumer
Financing Receivable, Impaired [Line Items]
Recorded investment	0		200
Unpaid principal balance	0		200
Related allowance	0		30
Average recorded investment	133		67
Interest income recognized	0		0
Combined: | Leases
Financing Receivable, Impaired [Line Items]
Recorded investment	0		83
Unpaid principal balance	0		83
Related allowance	0		13
Average recorded investment	55		951
Interest income recognized	$ 0		$ 0

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 6) $ in Thousands	Jun. 30, 2017 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	$ 62,573
Non-accrual	123,730
Current	19,374,583
Total	19,560,886
Premium finance loans past due 90 days and still accruing	6,300
Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	38,649
Non-accrual	36,932
Current	7,205,942
Total	7,281,523
Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,579
Non-accrual	82,636
Current	885,214
Total	969,429
Mortgage finance loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	5,183,600
Total	5,183,600
Construction | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	2,216,582
Total	2,216,582
Construction | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	25,980
Total	25,980
Real estate | Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,529
Non-accrual	0
Current	2,597,565
Total	2,603,094
Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,385
Non-accrual	1,571
Current	231,886
Total	238,842
Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	11,314
Non-accrual	2,591
Current	713,946
Total	727,851
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
Non-accrual	0
Current	39,122
Total	39,122
Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	117
Non-accrual	0
Current	274,746
Total	274,863
30-59 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	33,673
30-59 Days Past Due | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	22,321
30-59 Days Past Due | Commercial business loans | Energy
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	1,579
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	0
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	3,899
30-59 Days Past Due | Real estate | Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	5,221
30-59 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	536
30-59 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
30-59 Days Past Due | Leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	117
60-89 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	17,823
60-89 Days Past Due | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	6,988
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	57
60-89 Days Past Due | Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	10,778
60-89 Days Past Due | Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	0
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	11,077	[1]
Greater Than 90 Days and Accruing(1) | Commercial business loans | Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total past due	9,340	[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	1,630	[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 $6.3 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.

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LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 7) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Financing Receivable, Modifications [Line Items]
Non-accrual loans that met the criteria for restructured unfunded commitments	$ 16,700		$ 18,100
Number of restructured loans	2	2
Pre-restructuring outstanding recorded investment	$ 1,669	$ 14,235
Post-restructuring outstanding recorded investment	$ 1,372	$ 14,054
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	$ 700	$ 14,054
Commercial business loans
Financing Receivable, Modifications [Line Items]
Number of restructured loans	1
Pre-restructuring outstanding recorded investment	$ 599
Post-restructuring outstanding recorded investment	$ 672

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LOANS AND ALLOWANCE FOR LOAN LOSSES - TDR Summary (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Jun. 30, 2016
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	$ 1,372	$ 14,054
Extended maturity
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	700	0
Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Details of how restructured loans were modified	0	12,735
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	$ 672	$ 0

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OREO AND VALUATION ALLOWANCE FOR LOSSES ON OREO (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2017		Jun. 30, 2016	Jun. 30, 2017		Jun. 30, 2016
Real Estate Acquired Through Foreclosure [Roll Forward]
Beginning balance	$ 18,833		$ 17,585	$ 18,961	[1],[2]	$ 278
Additions	0		1,142	0		18,540
Sales	(144)		0	(272)		(91)
Ending balance	$ 18,689	[1],[2]	$ 18,727	$ 18,689	[1],[2]	$ 18,727

[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.

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details) - USD ($)	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Transfers and Servicing [Abstract]
Outstanding principal balance of loans in servicing portfolio Financial Assets, Principal Amount Outstanding	$ 5,000,000,000		$ 2,200,000,000
Escrow fund deposits related to servicing assets	33,800,000		$ 21,000,000
Estimated exposure related to servicing assets	1,100,000	$ 363,000
Loss Contingency Accrual, Payments	$ 7,200
Losses due to repurchase, indemnification or make-whole obligations		$ 0

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 1) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Unpaid principal balance	$ 844,728	$ 980,414
Fair value	843,164	968,929
Fair value over/(under) unpaid principal balance	(1,564)	(11,485)
Loans held for sale carried at lower of cost or market	$ 2,900	$ 2,900

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Loans Receivable Held-for-sale, Net, Reconciliation to Cash Flow [Roll Forward]
Beginning balance	$ 968,929	$ 86,075
Loans purchased	2,843,690	876,516
Payments and loans sold	(2,976,523)	(743,769)
Change in fair value	9,921	2,525
Ending balance	846,017	$ 221,347
Loans held for sale carried at lower of cost or market	$ 2,900		$ 2,900

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 3) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Valuation allowance:
Servicing asset, net(1)	$ 63,023	$ 8,543
MSR
Servicing asset:
Balance, beginning of year(1)	28,536	423
Capitalized servicing rights	37,343	8,805
Amortization	(2,856)	(271)
Balance, end of period	63,023	8,957
Valuation allowance:
Balance, beginning of year	0	0
Increase in valuation allowance	0	414
Balance, end of period	0	414
Servicing asset, net(1)	$ 64,889	$ 8,543

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 4)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
Average discount rates (percent)	9.91%	9.96%
Expected prepayment speeds (percent)	8.98%	7.91%
Weighted average life, in years	7 years 6 months	8 years

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CERTAIN TRANSFERS OF FINANCIAL ASSETS (Details 5) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Transfers and Servicing [Abstract]
50 bp adverse change in prepayment speed	$ (7,891)	$ (2,833)
100 bp adverse change in prepayment speed	$ (18,537)	$ (6,812)

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FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK (Details) - USD ($) $ in Thousands	Jun. 30, 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	$ 6,241,135	$ 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	$ 183,986	$ 171,266

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REGULATORY MATTERS (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Assets	$ 23,119,713		$ 21,697,134	$ 15,000,000
Common Equity Tier 1 Capital	$ 1,931,595		$ 1,841,219
Tier 1 capital	9.76%		10.23%
Total capital	11.83%		12.48%
Tier 1 leverage	10.28%		9.34%
Mortgage finance	$ 5,183,600		$ 4,497,338
Mortgage finance, average balance	$ 3,800,000
Common Equity Tier 1, Capital to Risk Weighted Assets	8.61%		8.97%
Capital	$ 2,654,760		$ 2,561,663
Tier One Risk Based Capital	2,190,105		2,101,071
Tier One Leverage Capital	$ 2,190,105		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	$ 1,830,487		$ 1,735,496
Tier 1 capital	8.87%		9.23%
Total capital	10.68%		11.19%
Tier 1 leverage	9.34%		8.42%
Common Equity Tier 1, Capital to Risk Weighted Assets	8.16%		8.45%
Common Equity Tier 1, Capital Required to be Well Capitalized	$ 1,458,317		$ 1,334,244
Common Equity Tier 1, Capital Required to be Well Capitalized to Risk Weighted Assets	6.50%		6.50%
Capital	$ 2,395,189		$ 2,297,528
Capital Required to be Well Capitalized	$ 2,243,565		$ 2,052,683
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%		10.00%
Tier One Risk Based Capital	$ 1,988,997		$ 1,895,348
Tier One Risk Based Capital Required to be Well Capitalized	$ 1,794,852		$ 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	$ 1,988,997		$ 1,895,348
Tier One Leverage Capital Required to be Well Capitalized	$ 1,064,894		$ 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	$ 1,290,441		$ 1,052,205
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	5.75%		5.125%
Capital Required for Capital Adequacy	$ 2,075,928		$ 1,770,766
Capital Required for Capital Adequacy to Risk Weighted Assets	9.25%		8.625%
Tier One Risk Based Capital Required for Capital Adequacy	$ 1,627,078		$ 1,360,154
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.25%		6.625%
Tier One Leverage Capital Required for Capital Adequacy	$ 852,102		$ 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	$ 1,290,050		$ 1,051,989
Common Equity Tier 1, Capital Required for Capital Adequacy to Risk Weighted Assets	5.75%		5.125%
Capital Required for Capital Adequacy	$ 2,075,297		$ 1,770,421
Capital Required for Capital Adequacy to Risk Weighted Assets	9.25%		8.625%
Tier One Risk Based Capital Required for Capital Adequacy	$ 1,626,584		$ 1,359,888
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets	7.25%		6.625%
Tier One Leverage Capital Required for Capital Adequacy	$ 851,915		$ 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	$ 1,570,972		$ 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	$ 2,356,458		$ 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	$ 1,907,609		$ 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	$ 852,102		$ 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	$ 1,570,495		$ 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	$ 2,355,743		$ 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	$ 1,907,030		$ 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	$ 851,915		$ 900,070
Tier One Leverage Capital Required for Capital Adequacy to Average Assets	4.00%		4.00%

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STOCK-BASED COMPENSATION (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	May 19, 2015
Restricted stock units, additional disclosures
Compensation expense	$ 4,395	$ 3,266	$ 8,954	$ 3,725
Unrecognized compensation expense related to unvested stock-settled awards	20,035		$ 20,035
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	74	77	$ 146	159
RSUs
Restricted stock units, additional disclosures
Compensation expense	1,714	1,030	3,307	2,078
Restricted stock
Restricted stock units, additional disclosures
Compensation expense	4	4	8	6
Cash-settled performance units
Restricted stock units, additional disclosures
Compensation expense	$ 2,603	$ 2,155	$ 5,493	$ 1,482
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

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FAIR VALUE DISCLOSURES (Assets and Liabilities) (Details) - USD ($)		Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value		$ 119,043,000			$ 24,874,000
Loans held for sale		843,164,000			968,929,000
OREO		18,689,000	[1],[2]	$ 18,833,000	18,961,000	[1],[2]	$ 18,727,000	$ 17,585,000	$ 278,000
Derivative assets		28,234,000			37,878,000
Derivative liabilities		26,432,000			26,240,000
U.S. Treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value		94,355,000
Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[3]	13,116,000			15,652,000
Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[4]				275,000
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[5],[6]	11,572,000			8,947,000
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
Non-qualified deferred compensation plan liabilities		4,502,000	[7]		1,811,000
Fair value measurements, recurring basis | Level 1 | U.S. Treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]	94,355,000
Fair value measurements, recurring basis | Level 1 | Residential mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]	0			0
Fair value measurements, recurring basis | Level 1 | Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]				0
Fair value measurements, recurring basis | Level 1 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8],[9]	4,419,000			1,786,000
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]	843,164,000			968,929,000
Derivative assets	[7]	28,234,000			37,878,000
Derivative liabilities	[7]	26,432,000			26,240,000
Non-qualified deferred compensation plan liabilities		0	[7]		0
Fair value measurements, recurring basis | Level 2 | U.S. Treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]	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]
Estimated Fair Value	[8]	13,116,000			15,652,000
Fair value measurements, recurring basis | Level 2 | Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]				275,000
Fair value measurements, recurring basis | Level 2 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8],[9]	7,153,000			7,161,000
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
Non-qualified deferred compensation plan liabilities		0	[7]		0
Fair value measurements, recurring basis | Level 3 | U.S. Treasuries
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]	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]
Estimated Fair Value	[8]	0			0
Fair value measurements, recurring basis | Level 3 | Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[8]				0
Fair value measurements, recurring basis | Level 3 | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated Fair Value	[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 held for investment	[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 held for investment	[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 held for investment	[1],[10]	43,702,000			52,323,000
OREO	[1],[2]	$ 18,689,000			$ 18,961,000

[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.

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FAIR VALUE DISCLOSURES (Financial Instruments) (Details) - USD ($) $ in Thousands		Jun. 30, 2017		Mar. 31, 2017	Dec. 31, 2016		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
OREO		$ 18,689	[1],[2]	$ 18,833	$ 18,961	[1],[2]	$ 18,727	$ 17,585	$ 278
Estimated Fair Value		119,043			24,874
Loans held for sale		843,164			968,929
Derivative assets		28,234			37,878
Servicing Asset at Fair Value, Amount		63,023			28,536
Senior Notes		281,225			281,044
Derivative liabilities		26,432			26,240
Level 1 | Carrying amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,269,635			2,839,352
Estimated Fair Value		98,774			1,786
Level 1 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents		2,269,635			2,839,352
Estimated Fair Value		98,774			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]
Estimated Fair Value		20,269			23,088
Loans held for sale		846,017			968,929
Derivative assets		28,234			37,878
Federal funds purchased		457,800			101,800
Customer repurchase agreements		4,424			7,775
Other borrowings		2,700,000			2,000,000
Senior Notes		281,225			281,044
Derivative liabilities		26,342			26,240
Level 2 | Estimated fair value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated Fair Value		20,269			23,088
Loans held for sale		846,234			968,929
Derivative assets		28,234			37,878
Federal funds purchased		457,800			101,800
Customer repurchase agreements		4,424			7,775
Other borrowings		2,700,000			2,000,000
Senior Notes		341,671			304,672
Derivative liabilities		26,342			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		19,289,728			17,330,223
Deposits		17,292,223			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		19,300,751			17,347,199
Deposits		17,296,750			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		59,300			74,100
Allowance allocation of impaired loans		15,600			21,800
OREO	[1],[2]	18,689			18,961
Loans held for investment, net	[1],[3]	$ 43,702			$ 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.

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DERIVATIVE FINANCIAL INSTRUMENTS (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Asset Derivative	$ 29,868	$ 39,632
Liability Derivative	28,066	27,994
Offsetting derivative liability	(1,634)	(1,754)
Offsetting derivative asset	(1,634)	(1,754)
Derivative asset, net	28,234	37,878
Derivative liability, net	$ 26,432	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	$ 28,200	37,900
Cash collateral pledge for derivatives	37,000	$ 24,800
Interest-bearing deposits
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	30,900
Accrued interest receivable and other assets
Derivatives, Fair Value [Line Items]
Cash collateral pledge for derivatives	$ 6,100
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	3.49%	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	4.47%	4.58%
Commercial loan/lease interest rate caps
Derivatives, Fair Value [Line Items]
Weighted-average interest rate received and paid	2.50%	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	$ 1,369,885	$ 1,144,367
Asset Derivative	1,632	1,754
Liability Derivative	25,512	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	266,886	210,996
Asset Derivative	347	819
Liability Derivative	2	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	1,369,885	1,144,367
Asset Derivative	25,512	25,421
Liability Derivative	1,632	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	266,886	210,996
Asset Derivative	2	0
Liability Derivative	347	819
Loan purchase commitments | Interest rate derivative | Economic hedging interest rate derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	236,187	237,805
Asset Derivative	209	1,351
Liability Derivative	573	0
Forward sales commitments | Interest rate derivative | Economic hedging interest rate derivatives
Derivatives, Fair Value [Line Items]
Notional Amount	1,029,400	1,218,000
Asset Derivative	2,166	10,287
Liability Derivative	$ 0	$ 0