Texas Capital Bancshares (TCBI) 10-K19 Feb 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 31, 2014	Feb. 18, 2015	Jun. 30, 2014
Document And Entity Information [Abstract]
Entity Registrant Name	TEXAS CAPITAL BANCSHARES INC/TX
Entity Central Index Key	1077428
Current Fiscal Year End Date	-19
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	31-Dec-14
Document Fiscal Year Focus	2014
Document Fiscal Period Focus (Q1,Q2,Q3,FY)	FY
Amendment Flag	FALSE
Entity Common Stock, Shares Outstanding		45,762,854
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$2,295,411,136

CONSOLIDATED_BALANCE_SHEETS

CONSOLIDATED BALANCE SHEETS (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and due from banks	$96,524	$92,484
Interest-bearing deposits	1,233,990	61,337
Federal funds sold	0	90
Securities, available-for-sale	41,719	63,214
Loans held for investment, mortgage finance	4,102,125	2,784,265
Loans held for investment (net of unearned income)	10,154,887	8,486,603
Less: Allowance for loan losses	-100,954	-87,604
Loans held for investment, net	14,156,058	11,183,264
Premises and equipment, net	17,368	11,482
Accrued interest receivable and other assets	333,699	286,907
Goodwill and intangible assets, net	20,588	21,286
Total assets	15,899,946	11,720,064
Deposits:
Non-interest-bearing	5,011,619	3,347,567
Interest-bearing	7,348,972	5,579,505
Interest-bearing in foreign branches	312,709	330,307
Total deposits	12,673,300	9,257,379
Accrued interest payable	4,747	749
Other liabilities	145,622	115,550
Federal funds purchased and repurchase agreements	92,676	170,604
Other borrowings	1,100,005	855,026
Subordinated notes	286,000	111,000
Trust preferred subordinated debentures	113,406	113,406
Total liabilities	14,415,756	10,623,714
Comprehensive income:
Preferred stock, $.01 par value, $1,000 liquidation value: Authorized shares - 10,000,000; Issued shares - 6,000,000 shares issued at December 31, 2014 and 2013	150,000	150,000
Common stock, $.01 par value: Authorized shares - 100,000,000; Issued shares - 45,735,424 and 41,036,787 at December 31, 2014 and 2013, respectively	457	410
Additional paid-in capital	709,738	448,208
Retained earnings	622,714	496,112
Treasury stock (shares at cost: 417 at December 31, 2014 and 2013)	-8	-8
Accumulated other comprehensive income, net of taxes	1,289	1,628
Total stockholdersâ€™ equity	1,484,190	1,096,350
Total liabilities and stockholdersâ€™ equity	$15,899,946	$11,720,064

CONSOLIDATED_BALANCE_SHEETS_Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Preferred stock, par value	$0.01	$0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	6,000,000	6,000,000
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	45,735,424	41,036,787
Treasury stock, shares	417	417

CONSOLIDATED_STATEMENTS_OF_INC

CONSOLIDATED STATEMENTS OF INCOME AND OTHER COMPREHENSIVE INCOME (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Interest and fees on loans	$511,606	$441,314	$393,548
Securities	1,828	3,015	4,688
Federal funds sold	207	65	13
Deposits in other banks	906	231	208
Total interest income	514,547	444,625	398,457
Interest expense
Deposits	18,145	14,030	13,644
Federal funds purchased	373	686	979
Repurchase agreements	17	18	13
Other borrowings	356	515	2,149
Subordinated notes	16,202	7,327	2,037
Trust preferred subordinated debentures	2,489	2,536	2,756
Total interest expense	37,582	25,112	21,578
Net interest income	476,965	419,513	376,879
Provision for credit losses	22,000	19,000	11,500
Net interest income after provision for credit losses	454,965	400,513	365,379
Non-interest income
Service charges on deposit accounts	7,253	6,783	6,605
Trust fee income	4,937	5,023	4,822
Bank owned life insurance (BOLI) income	2,067	1,917	2,168
Brokered loan fees	13,981	16,980	17,596
Swap fees	2,992	5,520	4,909
Other	11,281	7,801	6,940
Total non-interest income	42,511	44,024	43,040
Non-interest expense
Salaries and employee benefits	169,051	157,752	121,456
Net occupancy expense	20,866	16,821	14,852
Marketing	15,989	16,203	13,449
Legal and professional	21,182	18,104	17,557
Communications and technology	18,667	13,762	11,158
FDIC insurance assessment	10,919	8,057	5,568
Allowance and other carrying costs for OREO	85	1,788	9,075
Other	28,355	24,242	26,766
Total non-interest expense	285,114	256,729	219,881
Income before income taxes	212,362	187,808	188,538
Income tax expense	76,010	66,757	67,866
Net income	136,352	121,051	120,672
Preferred stock dividends	-9,750	-7,394	0
Net income available to common stockholders	126,602	113,657	120,672
Other comprehensive gain (loss)
Change in unrealized gain on available-for-sale securities arising during period, before tax	-522	-2,529	-2,231
Income tax benefit related to unrealized loss on available-for-sale securities	-183	-885	-781
Other comprehensive loss net of tax	-339	-1,644	-1,450
Comprehensive income	$136,013	$119,407	$119,222
Basic earnings per common share
Basic earnings per common share	$2.93	$2.78	$3.09
Diluted earnings per common share
Diluted earnings per common share	$2.88	$2.72	$3

CONSOLIDATED_STATEMENTS_OF_STO

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)	Total	Preferred Stock	Common Stock	Preferred Stock	Preferred Stock	Common Stock	Common Stock	Additional Paid-in Capital	Additional Paid-in Capital	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
In Thousands, except Share data, unless otherwise specified	Total	Preferred Stock	Common Stock	Preferred Stock	Preferred Stock	Common Stock	Common Stock	Additional Paid-in Capital	Preferred Stock	Common Stock	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income
Beginning balance - Amount at Dec. 31, 2011	$616,331					$376		$349,458			$261,783	($8)	$4,722
Beginning balance - Shares at Dec. 31, 2011						37,666,708						417
Net income	120,672										120,672
Comprehensive income:
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	-1,450												-1,450
Comprehensive income	119,222
Tax expense related to exercise of stock-based awards	7,769							7,769
Stock-based compensation expense recognized in earnings	5,578							5,578
Issuance of stock related to stock-based awards - Shares						761,288
Issuance of stock related to stock-based awards - Amount	355					8		347
Issuance of stock - Shares						2,300,000
Issuance of stock - Amount	86,987					23		86,964
Ending balance - Amount at Dec. 31, 2012	836,242					407		450,116			382,455	-8	3,272
Ending balance - Shares at Dec. 31, 2012						40,727,996						417
Net income	121,051										121,051
Comprehensive income:
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	-1,644												-1,644
Comprehensive income	119,407
Tax expense related to exercise of stock-based awards	1,200							1,200
Stock-based compensation expense recognized in earnings	4,118							4,118
Issuance of stock related to stock-based awards - Shares						272,452
Issuance of stock related to stock-based awards - Amount	-2,250					3		-2,253
Issuance of stock - Shares					6,000,000		36,339
Issuance of stock - Amount		144,987	40		150,000		0		5,013	40
Preferred stock dividends	-7,394										-7,394
Ending balance - Amount at Dec. 31, 2013	1,096,350			150,000		410		448,208			496,112	-8	1,628
Ending balance - Shares at Dec. 31, 2013				6,000,000		41,036,787						417
Comprehensive income:
Issuance of stock - Shares						1,900,000
Issuance of stock - Amount						106,500
Ending balance - Amount at Jan. 31, 2014
Beginning balance - Amount at Dec. 31, 2013	1,096,350			150,000		410		448,208			496,112	-8	1,628
Beginning balance - Shares at Dec. 31, 2013				6,000,000		41,036,787						417
Net income	136,352										136,352
Comprehensive income:
Change in unrealized gain (loss) on available-for-sale securities, net of taxes	-339												-339
Comprehensive income	136,013
Tax expense related to exercise of stock-based awards	2,929							2,929
Stock-based compensation expense recognized in earnings	4,628							4,628
Issuance of stock related to stock-based awards - Shares						201,280
Issuance of stock related to stock-based awards - Amount	-2,203					2		-2,205
Issuance of stock - Shares						4,398,128
Issuance of stock - Amount	256,223					44		256,179
Preferred stock dividends	-9,750										-9,750
Issuance of stock related to warrants - Shares						99,229
Issuance of stock related to warrants - Amount	0					1		-1
Ending balance - Amount at Dec. 31, 2014	$1,484,190			$150,000		$457		$709,738			$622,714	($8)	$1,289
Ending balance - Shares at Dec. 31, 2014				6,000,000		45,735,424						417

CONSOLIDATED_STATEMENTS_OF_STO1

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Income tax expense (benefit) related to unrealized loss on available-for-sale securities	($183)	($885)	($781)

CONSOLIDATED_STATEMENTS_OF_CAS

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income	$136,352	$121,051	$120,672
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	22,000	19,000	11,500
Deferred tax expense	-3,969	-11,599	-3,131
Depreciation and amortization	14,798	11,480	9,437
Amortization on securities	0	22	38
Bank owned life insurance (BOLI) income	-2,067	-1,917	-2,168
Stock-based compensation expense	14,577	20,953	12,018
Excess tax benefits from stock-based compensation arrangements	-2,929	-1,200	-7,769
Gain on sale of assets	-822	-931	-917
Changes in operating assets and liabilities:
Accrued interest receivable and other assets	-58,579	31,010	-61,243
Accrued interest payable and other liabilities	32,599	3,508	10,835
Net cash provided by operating activities	151,960	191,377	89,272
Investing activities
Purchases of available-for-sale securities	0	-2	-13
Maturities and calls of available-for-sale securities	11,150	15,890	14,260
Principal payments received on available-for-sale securities	9,822	18,542	27,000
Originations of mortgage finance loans	-58,090,177	-51,087,328	-51,110,692
Proceeds from pay-offs of mortgage finance loans	56,772,317	51,478,335	50,015,503
Net increase in loans held for investment, excluding mortgage finance loans	-1,676,927	-1,706,505	-1,220,626
Purchase of premises and equipment, net	-9,965	-4,029	-3,538
Proceeds from sale of foreclosed assets	5,877	11,667	14,921
Cash paid for acquisition	0	-2,445	0
Net cash used in investing activities	-2,977,903	-1,275,875	-2,263,185
Financing activities
Net increase in deposits	3,415,921	1,816,575	1,884,547
Proceeds (costs) from issuance of stock related to stock-based awards and warrants	-2,203	-2,210	355
Net proceeds from issuance of common stock	256,223	0	86,987
Net proceeds from issuance of preferred stock	0	144,987	0
Preferred dividends paid	-9,750	-6,960	0
Net increase (decrease) in other borrowings	244,979	-797,002	318,115
Excess tax benefits from stock-based compensation arrangements	2,929	1,200	7,769
Net decrease in federal funds purchased and repurchase agreements	-77,928	-124,529	-139,070
Issuance of subordinated notes	172,375	0	111,000
Net cash provided by financing activities	4,002,546	1,032,061	2,269,703
Net increase (decrease) in cash and cash equivalents	1,176,603	-52,437	95,790
Cash and cash equivalents at beginning of period	153,911	206,348	110,558
Cash and cash equivalents at end of period	1,330,514	153,911	206,348
Supplemental disclosures of cash flow information:
Cash paid during the period for interest	33,584	24,962	21,527
Cash paid during the period for income taxes	74,998	77,635	69,095
Transfers from loans/leases to OREO and other repossessed assets	$851	$1,331	$3,489

Operations_and_Summary_of_Sign

Operations and Summary of Significant Accounting Policies	12 Months Ended
Operations and Summary of Significant Accounting Policies	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Operations and Summary of Significant Accounting Policies	Operations and Summary of Significant Accounting Policies
	Organization and Nature of Business
	Texas Capital Bancshares, Inc. (the "Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the "Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional or national clientele of commercial borrowers. We are primarily a secured lender, with 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.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of stock-based compensation awards, the fair values of financial instruments and the status of contingencies are particularly susceptible to significant change in the near term.
	Cash and Cash Equivalents
	Cash equivalents include amounts due from banks, interest-bearing deposits and Federal funds sold.
	Securities
	Securities are classified as trading, available-for-sale or held-to-maturity. Management classifies securities at the time of purchase and re-assesses such designation at each balance sheet date; however, transfers between categories from this re-assessment are rare.
	Trading Account
	Securities acquired for resale in anticipation of short-term market movements are classified as trading, with realized and unrealized gains and losses recognized in income. To date, we have not had any activity in our trading account.
	Held-to-Maturity and Available-for-Sale
	Debt securities are classified as held-to-maturity when we have the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost. Debt securities not classified as held-to-maturity or trading and marketable equity securities not classified as trading are classified as available-for-sale.
	Available-for-sale securities are stated at fair value, with the unrealized gains and losses reported in a separate component of accumulated other comprehensive income (loss), net of tax. The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity, or in the case of mortgage-backed securities, over the estimated life of the security. Such amortization and accretion is included in interest income from securities. Realized gains and losses and declines in value judged to be other-than-temporary are included in gain (loss) on sale of securities. The cost of securities sold is based on the specific identification method.
	All securities are available-for-sale as of December 31, 2014 and 2013.
	Loans
	Loans Held for Investment
	Loans held for investment (which include equipment leases accounted for as financing leases) are stated at the amount of unpaid principal reduced by deferred income (net of costs). Interest on loans is recognized using the simple-interest method on the daily balances of the principal amounts outstanding. Loan origination fees, net of direct loan origination costs, and commitment fees, are deferred and amortized as an adjustment to yield over the life of the loan, or over the commitment period, as applicable.
	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 loan agreement. Reserves on impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or the fair value of the underlying collateral. Impaired loans, or portions thereof, are charged off when deemed uncollectable.
	The accrual of interest on loans is discontinued 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 book balance of the asset is deemed to be collectible. If collectability is questionable, then cash payments are applied to principal. 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.
	Loans held for investment includes legal ownership interests in mortgage loans that we purchase through our mortgage warehouse lending division. The ownership interests are purchased from unaffiliated mortgage originators who are seeking additional funding through sale of the undivided ownership interests to facilitate their ability to originate loans. The mortgage originator has no obligation to offer and we have no obligation to purchase these interests. The originator closes mortgage loans consistent with underwriting standards established by approved investors, and, at the time of the sale to the investor, our ownership interest and that of the originator are delivered by us to the investor selected by the originator and approved by us. We typically purchase up to a 99% ownership interest in each mortgage with the originator owning the remaining percentage. These mortgage ownership interests are held by us for a period of less than 30 days and more typically 10-20 days. Because of conditions in agreements with originators designed to reduce transaction risks, under Accounting Standards Codification 860, Transfers and Servicing of Financial Assets (“ASC 860”), the ownership interests do not qualify as participating interests. Under ASC 860, the ownership interests are deemed to be loans to the originators and payments we receive from investors are deemed to be payments made by or on behalf of the originator to repay the loan deemed made to the originator. Because we have an actual, legal ownership interest in the underlying residential mortgage loan, these interests are not extensions of credit to the originators that are secured by the mortgage loans as collateral.
	Due to market conditions or events of default by the investor or the originator, we could be required to purchase the remaining interests in the mortgage loans and hold them beyond the expected 10-20 days. Mortgage loans acquired under these conditions would require mark-to-market adjustments to income and could require future allocations of the allowance for loan losses or be subject to charge off in the event the loans become impaired. Mortgage loan interests purchased and disposed of as expected receive no allocation of the allowance for loan losses due to the minimal loss experience with these assets.
	Allowance for Loan Losses
	The allowance for loan losses is established through a provision for loan losses charged against income. The allowance for loan losses includes specific reserves for impaired loans and a general reserve for estimated losses inherent in the loan portfolio at the balance sheet date, but not yet identified with specific loans. Loans deemed to be uncollectable are charged against the allowance when management believes that the collectability of the principal is unlikely and subsequent recoveries, if any, are credited to the allowance. Management’s periodic evaluation of the adequacy of the allowance is based on an assessment of the current loan portfolio, including known inherent risks, adverse situations that may affect the borrowers’ ability to repay, the estimated value of any underlying collateral and current economic conditions.
	Other Real Estate Owned
	Other real estate owned (“OREO”), which is included in other assets on the consolidated balance sheet, consists of real estate that has been foreclosed. Real estate that has been foreclosed is recorded at the fair value of the real estate, less selling costs, through a charge to the allowance for loan losses, if necessary. Subsequent write-downs required for declines in value are recorded through a valuation allowance, or taken directly to the asset, charged to other non-interest expense.
	Premises and Equipment
	Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which range from three to ten years. Gains or losses on disposals of premises and equipment are included in results of operations.
	Marketing and Software
	Marketing costs are expensed as incurred. Ongoing maintenance and enhancements of websites are expensed as incurred. Costs incurred in connection with development or purchase of internal use software are capitalized and amortized over a period not to exceed five years. Internal use software costs are included in other assets in the consolidated balance sheets.
	Goodwill and Other Intangible Assets
	Intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Our intangible assets relate primarily to loan customer relationships. Intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. Goodwill and intangible assets are tested for impairment annually or whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
	Segment Reporting
	We have determined that all of our lending divisions and subsidiaries meet the aggregation criteria of ASC 280, Segment Reporting, since all offer similar products and services, operate with similar processes, and have similar customers.
	Stock-based Compensation
	We account for all stock-based compensation transactions in accordance with ASC 718, Compensation — Stock Compensation (“ASC 718”), which requires that stock compensation transactions be recognized as compensation expense in the consolidated statement of income and other comprehensive income based on their fair values on the measurement date, which is the date of the grant.
	Accumulated Other Comprehensive Income
	Unrealized gains or losses on our available-for-sale securities (after applicable income tax expense or benefit) are included in accumulated other comprehensive income, net. Accumulated comprehensive income (loss), net for the three years ended December 31, 2014 is reported in the accompanying consolidated statements of stockholders’ equity and consolidated statements of income and other comprehensive income.
	Income Taxes
	The Company and its subsidiary file a consolidated federal income tax return. We utilize the liability method in accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based upon the difference between the values of the assets and liabilities as reflected in the financial statements and their related tax basis using enacted tax rates in effect for the year in which the differences are expected to be recovered or settled. As changes in tax law or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. A valuation reserve is provided against deferred tax assets unless it is more likely than not that such deferred tax assets will be realized.
	Basic and Diluted Earnings Per Common Share
	Basic earnings per common share is based on net income available to common stockholders divided by the weighted-average number of common shares outstanding during the period excluding non-vested stock. Diluted earnings per common share include the dilutive effect of stock options and non-vested stock awards granted using the treasury stock method. A reconciliation of the weighted-average shares used in calculating basic earnings per common share and the weighted average common shares used in calculating diluted earnings per common share for the reported periods is provided in Note 14 — Earnings Per Share.
	Fair Values of Financial Instruments
	ASC 820, Fair Value Measurements and Disclosures (“ASC 820”), defines fair value, establishes a framework for measuring fair value under GAAP and enhances disclosures about fair value measurements. In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is 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.

Securities

Securities	12 Months Ended
	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Securities	Securities
	The following is a summary of securities (in thousands):



		31-Dec-14
		Amortized				Gross				Gross				Estimated
		Cost				Unrealized				Unrealized				Fair
						Gains				Losses				Value
	Available-for-sale securities:
	Residential mortgage-backed securities	$	28,957			$	2,108			$	—			$	31,065

	Municipals	3,257				10				—				3,267

	Equity securities(1)	7,522				16				(151		)		7,387

		$	39,736			$	2,134			$	(151	)		$	41,719




		31-Dec-13
		Amortized				Gross				Gross				Estimated
		Cost				Unrealized				Unrealized				Fair
						Gains				Losses				Value
	Available-for-sale securities:
	Residential mortgage-backed securities	$	38,786			$	2,676			$	—			$	41,462

	Municipals	14,401				104				—				14,505

	Equity securities(1)	7,522				—				(275		)		7,247

		$	60,709			$	2,780			$	(275	)		$	63,214


	-1	Equity securities consist of Community Reinvestment Act funds.
	The amortized cost and estimated fair value of securities are presented below by contractual maturity (in thousands, except percentage data):



		31-Dec-14
		Less Than				After One				After Five				After Ten				Total
		One Year				Through				Through				Years
						Five Years				Ten Years
	Available-for-sale:
	Residential mortgage-backed securities:(1)
	Amortized cost	$	1			$	9,151			$	5,661			$	14,144			$	28,957

	Estimated fair value	1				9,662				6,333				15,069				31,065

	Weighted average yield(3)	6.5		%		4.79		%		5.54		%		2.36		%		3.75		%
	Municipals:(2)
	Amortized cost	1,669				1,588				—				—				3,257

	Estimated fair value	1,674				1,593				—				—				3,267

	Weighted average yield(3)	5.78		%		5.79		%		—		%		—		%		5.79		%
	Equity securities:(4)
	Amortized cost	7,522				—				—				—				7,522

	Estimated fair value	7,387				—				—				—				7,387

	Total available-for-sale securities:
	Amortized cost																	$	39,736

Estimated fair value																	$	41,719



	31-Dec-13
	Less Than				After One				After Five				After Ten				Total
	One Year				Through				Through				Years
					Five Years				Ten Years
Available-for-sale:
Residential mortgage-backed securities:(1)
Amortized cost	$	238			$	14,720			$	7,718			$	16,110			$	38,786

Estimated fair value	252				15,641				8,456				17,113				41,462

Weighted average yield(3)	4.32		%		4.78		%		5.56		%		2.4		%		3.94		%
Municipals:(2)
Amortized cost	7,749				6,652				—				—				14,401

Estimated fair value	7,818				6,687				—				—				14,505

Weighted average yield(3)	5.76		%		5.71		%		—		%		—		%		5.73		%
Equity securities:(4)
Amortized cost	7,522				—				—				—				7,522

Estimated fair value	7,247				—				—				—				7,247

Total available-for-sale securities:
Amortized cost																	$	60,709

Estimated fair value																	$	63,214


-1	Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. The average expected life of the mortgage-backed securities was 1.2 years at December 31, 2014 and 1.4 years at December 31, 2013.

-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.
Securities with carrying values of approximately $32,718,000 and $45,993,000 were pledged to secure certain borrowings and deposits at December 31, 2014 and 2013, respectively. See Note 8 — Borrowing Arrangements for discussion of securities securing borrowings. Of the pledged securities at December 31, 2014 and 2013, approximately $10,891,000 and $8,273,000, respectively, were pledged for certain deposits.
The following table discloses, as of December 31, 2014 and December 31, 2013, 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):



31-Dec-14	Less Than 12 Months								12 Months or Longer								Total
	Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
	Value				Loss				Value				Loss				Value				Loss

Equity securities	$	—			$	—			$	6,349			$	(151	)		$	6,349			$	(151	)


31-Dec-13	Less Than 12 Months								12 Months or Longer								Total
	Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
	Value				Loss				Value				Loss				Value				Loss

Equity securities	$	7,247			$	(275	)		$	—			$	—			$	7,247			$	(275	)

At December 31, 2014 and 2013, we had one investment with an unrealized loss position. This security is a publicly traded equity fund and is subject to market pricing volatility. We do not believe that this unrealized loss is “other than temporary.” We have evaluated the near-term prospects of the investment in relation to the severity and duration of the impairment and based on that evaluation have the ability and intent to hold the investment until recovery of fair value. We have not identified any issues related to the ultimate recovery of our investment as a result of credit concerns on this security.
Unrealized gains or losses on our available-for-sale securities (after applicable income tax expense or benefit) are included in accumulated other comprehensive income, net. We had comprehensive income of $136.0 million for the year ended December 31, 2014 and comprehensive income of $119.4 million for the year ended December 31, 2013. Comprehensive income during the years ended December 31, 2014 and 2013 included a net after-tax loss of $339.0 thousand and $1.6 million, respectively, due to changes in the net unrealized gains/losses on securities available-for-sale.

Loans_and_Allowance_for_Credit

Loans and Allowance for Credit Losses	12 Months Ended
	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Loans and Allowance for Credit Losses	Loans
	Loans held for investment are summarized by category as follows (in thousands):


		December 31,
		2014				2013
	Commercial	$	5,869,219			$	5,020,565

	Mortgage finance	4,102,125				2,784,265

	Construction	1,416,405				1,262,905

	Real estate	2,807,127				2,146,522

	Consumer	19,699				15,350

	Equipment leases	99,495				93,160

	Gross loans held for investment	14,314,070				11,322,767

	Deferred income (net of direct origination costs)	(57,058		)		(51,899		)
	Allowance for loan losses	(100,954		)		(87,604		)
	Total	$	14,156,058			$	11,183,264

	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 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 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. December 31, 2014 and 2013 balances are stated net of $358.3 million and $33.1 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 December 31, 2014 and 2013, we had a blanket floating lien on certain real estate-secured loans, mortgage finance loans and also certain securities used as collateral for FHLB borrowings.
	Portfolio Geographic Concentration
	As of December 31, 2014, 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. Additionally, we make loans to these businesses and individuals secured by assets located outside of Texas. The risks created by the geographic distribution of loans have been considered by management in the determination of the adequacy of the allowance for loan losses. Management believes the allowance for loan losses is appropriate to cover estimated losses on loans at each balance sheet date.
	Summary of Loan Losses
	The allowance for loan losses is comprised of specific reserves for impaired loans and an estimate of losses inherent in the portfolio at the balance sheet date, but not yet identified with specified loans. We regularly evaluate our reserve for loan losses to maintain an appropriate level to absorb estimated loan losses inherent in the loan portfolio. Factors contributing to the determination of reserves include the creditworthiness of the borrower, changes in the value of pledged collateral, and general economic conditions. All loan commitments rated substandard or worse and greater than $500,000 are specifically reviewed for loss potential. For loans deemed to be impaired, a specific allocation is assigned based on the losses expected to be realized from those loans. For purposes of determining the general reserve, the portfolio is segregated by product types to recognize differing risk profiles among categories, and then further segregated by credit grades. Credit grades are assigned to all loans. Each credit grade is assigned a risk factor, or reserve allocation percentage. These risk factors are multiplied by the outstanding principal balance and risk-weighted by product type to calculate the required reserve. A similar process is employed to calculate a reserve assigned to off-balance sheet commitments, specifically unfunded loan commitments and letters of credit, and any needed reserve is recorded in other liabilities. Even though portions of the allowance may be allocated to specific loans, the entire allowance is available for any credit that, in management’s judgment, should be charged off.
	We have several pass credit grades that are assigned to loans based on varying levels of risk, ranging from credits that are secured by cash or marketable securities, to watch credits which have all the characteristics of an acceptable credit risk but warrant more than the normal level of monitoring. Within our criticized/classified credit grades are special mention, substandard, and doubtful. Special mention loans are those that are currently protected by sound worth and paying capacity of the borrower, but that are potentially weak and constitute an additional credit risk. The loan has the potential to deteriorate to a substandard grade due to the existence of financial or administrative deficiencies. Substandard loans have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that we will sustain some loss if the deficiencies are not corrected. Some substandard loans are inappropriately protected by sound worth and paying capacity of the borrower and of the collateral pledged and may be considered impaired. Substandard loans can be accruing or can be on non-accrual depending on the circumstances of the individual loans. Loans classified as doubtful have all the weaknesses inherent in substandard loans with the added characteristics that the weaknesses make collection or liquidation in full highly questionable and improbable. The possibility of loss is extremely high. All doubtful loans are on non-accrual.
	The reserve allocation percentages assigned to each credit grade have been developed based primarily on an analysis of our historical loss rates. The allocations are adjusted for certain qualitative factors, including general economic conditions, changes in credit policies and lending standards. Changes in the trend and severity of problem loans can cause the estimation of losses to differ from past experience. In addition, the reserve considers the results of reviews performed by independent third party reviewers as reflected in their confirmations of assigned credit grades within the portfolio. The portion of the allowance that is not derived by the allowance allocation percentages compensates 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. Examples of risks that support the Bank's maintaining an unallocated reserve include the possibility of precipitous negative changes in economic conditions and borrowers' submission of financial statements or certifications of collateral value that subsequently prove to be materially inaccurate for reason of either misstatement or omission of critical information. These situations, while not common, do not necessarily correlate well with the general risk profile presented by assigned credit grade and product type categories. We evaluate many such factors and conditions in determining the unallocated portion of the allowance, including amount and frequency of losses attributable to issues not specifically addressed or included in the determination and application of the allowance allocation percentages. The allowance is considered appropriate, given management’s assessment of potential losses within the portfolio as of the evaluation date, the significant growth in the loan and lease portfolio, current economic conditions in the Company’s market areas and other factors.
	The methodology used in the periodic review of reserve adequacy, which is performed at least quarterly, is designed to be dynamic and responsive to changes in portfolio credit quality. The changes are reflected in the general reserve and in specific reserves as the collectability of larger classified loans is evaluated with new information. As our portfolio has matured, historical loss ratios have been closely monitored, and our reserve adequacy relies primarily on our loss history. The review of reserve adequacy is performed by executive management and presented to a committee of our board of directors for their review. The committee reports to the board as part of the board's review on a quarterly basis of the Company's consolidated financial statements.
	The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of December 31, 2014 and 2013 (in thousands):


		Commercial				Mortgage				Construction			Real Estate			Consumer			Equipment Leases			Total
						Finance
	31-Dec-14
	Grade:
	Pass	$	5,738,474			$	4,102,125			$	1,414,671		$	2,785,804		$	19,579		$	91,044		$	14,151,697

	Special mention	53,839				—				1,734			8,723			11			4,363			68,670

	Substandard- accruing	43,784				—				—			2,653			47			3,915			50,399

	Non-accrual	33,122				—				—			9,947			62			173			43,304

	Total loans held for investment	$	5,869,219			$	4,102,125			$	1,416,405		$	2,807,127		$	19,699		$	99,495		$	14,314,070




		Commercial				Mortgage				Construction			Real Estate			Consumer			Equipment Leases			Total
						Finance
	31-Dec-13
	Grade:
	Pass	$	4,908,944			$	2,784,265			$	1,261,995		$	2,099,744		$	15,251		$	89,317		$	11,159,516

	Special mention	24,132				—				102			6,338			—			51			30,623

Substandard-accruing	74,593				—				103			21,770			45			3,742			100,253

Non-accrual	12,896				—				705			18,670			54			50			32,375

Total loans held for investment	$	5,020,565			$	2,784,265			$	1,262,905		$	2,146,522		$	15,350		$	93,160		$	11,322,767

The following tables detail activity in the reserve for loan losses by portfolio segment for the years ended December 31, 2014 and 2013. Allocation of a portion of the reserve to one category of loans does not preclude its availability to absorb losses in other categories.


	Commercial				Mortgage				Construction			Real			Consumer			Equipment Leases			Unallocated			Total
					Finance							Estate
December 31, 2014
(in thousands)
Beginning balance	$	39,868			$	—			$	14,553		$	24,210		$	149		$	3,105		$	5,719		$	87,604

Provision for loan losses	37,827				—				(6,618		)	(8,411		)	195			(3,046		)	(317		)	19,630

Charge-offs	9,803				—							296			266			—			—			10,365

Recoveries	2,762				—							79			162			1,082			—			4,085

Net charge-offs (recoveries)	7,041				—				—			217			104			(1,082		)	—			6,280

Ending balance	$	70,654			$	—			$	7,935		$	15,582		$	240		$	1,141		$	5,402		$	100,954

Period end amount allocated to:
Loans individually evaluated for impairment	$	7,705			$	—			$	—		$	636		$	9		$	26		$	—		$	8,376

Loans collectively evaluated for impairment	62,949				—				7,935			14,946			231			1,115			5,402			92,578

Ending balance	$	70,654			$	—			$	7,935		$	15,582		$	240		$	1,141		$	5,402		$	100,954

	Commercial				Mortgage				Construction			Real			Consumer			Equipment Leases			Unallocated			Total
					Finance							Estate
December 31, 2013
(in thousands)
Beginning balance	$	21,547			$	—			$	12,097		$	30,893		$	226		$	2,460		$	7,114		$	74,337

Provision for loan losses	23,693				—				2,456			(6,809		)	(105		)	325			(1,395		)	18,165

Charge-offs	6,575				—				—			144			45			2			—			6,766

Recoveries	1,203				—				—			270			73			322			—			1,868

Net charge-offs (recoveries)	5,372				—				—			(126		)	(28		)	(320		)	—			4,898

Ending balance	$	39,868			$	—			$	14,553		$	24,210		$	149		$	3,105		$	5,719		$	87,604

Period end amount allocated to:
Loans individually evaluated for impairment	$	2,015			$	—			$	—		$	1,143		$	8		$	8		$	—		$	3,174

Loans collectively evaluated for impairment	37,853				—				14,553			23,067			141			3,097			5,719			84,430

Ending balance	$	39,868			$	—			$	14,553		$	24,210		$	149		$	3,105		$	5,719		$	87,604

Our recorded investment in loans as of December 31, 2014 and 2013 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):


	Commercial				Mortgage				Construction			Real			Consumer			Equipment Leases			Total
					Finance							Estate
31-Dec-14
Loans individually evaluated for impairment	$	35,165			$	—			$	—		$	13,880		$	62		$	173		$	49,280

Loans collectively evaluated for impairment	5,834,054				4,102,125				1,416,405			2,793,247			19,637			99,322			14,264,790

Total	$	5,869,219			$	4,102,125			$	1,416,405		$	2,807,127		$	19,699		$	99,495		$	14,314,070



	Commercial				Mortgage				Construction			Real			Consumer			Equipment Leases			Total
					Finance							Estate
31-Dec-13
Loans individually evaluated for impairment	$	15,139			$	—			$	705		$	24,028		$	54		$	50		$	39,976

Loans collectively evaluated for impairment	5,005,426				2,784,265				1,262,200			2,122,494			15,296			93,110			11,282,791

Total	$	5,020,565			$	2,784,265			$	1,262,905		$	2,146,522		$	15,350		$	93,160		$	11,322,767

We have traditionally maintained an unallocated 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 unallocated reserves at December 31, 2014 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.
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. We recognized $1.7 million in interest income on non-accrual loans during 2014 compared to $2.4 million in 2013 and $2.6 million in 2012. Additional interest income that would have been recorded if the loans had been current during the years ended December 31, 2014, 2013 and 2012 totaled $2.1 million, $2.5 million and $2.4 million, respectively. As of December 31, 2014, $310,000 of our non-accrual loans were earning on a cash basis, compared to none at December 31, 2013. 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 loan agreement. In accordance with FASB ASC 310 Receivables, we have included all restructured loans in our impaired loan totals. The following tables detail our impaired loans, by portfolio class as of December 31, 2014 and 2013 (in thousands):


31-Dec-14
	Recorded				Unpaid				Related			Average			Interest
	Investment				Principal				Allowance			Recorded			Income
					Balance							Investment			Recognized
With no related allowance recorded:
Commercial
Business loans	$	9,608			$	11,857			$	—		$	7,334		$	—

Energy loans	—				—				—			375			25

Construction
Market risk	—				—				—			118			—

Real estate
Market risk	3,735				3,735				—			7,970			—

Commercial	3,521				3,521				—			2,795			—

Secured by 1-4 family	—				—				—			1,210			—

Consumer	—				—				—			—			—

Equipment leases	—				—				—			—			—

Total impaired loans with no allowance recorded	$	16,864			$	19,113			$	—		$	19,802		$	25

With an allowance recorded:
Commercial
Business loans	$	24,553			$	25,553			$	7,433		$	17,705		$	—

Energy loans	1,004				1,004				272			991			—

Construction
Market risk	—				—				—			—			—

Real estate
Market risk	4,203				4,203				317			5,064			—

Commercial	526				526				79			705			—

Secured by 1-4 family	1,895				1,895				240			2,119			—

Consumer	62				62				9			16			—

Equipment leases	173				173				26			41			—

Total impaired loans with an allowance recorded	$	32,416			$	33,416			$	8,376		$	26,641		$	—

Combined:
Commercial
Business loans	$	34,161			$	37,410			$	7,433		$	25,039		$	—

Energy loans	1,004				1,004				272			1,366			25

Construction
Market risk	—				—				—			118			—

Real estate
Market risk	7,938				7,938				317			13,034			—

Commercial	4,047				4,047				79			3,500			—

Secured by 1-4 family	1,895				1,895				240			3,329			—

Consumer	62				62				9			16			—

Equipment leases	173				173				26			41			—

Total impaired loans	$	49,280			$	52,529			$	8,376		$	46,443		$	25



31-Dec-13
	Recorded				Unpaid				Related			Average			Interest
	Investment				Principal				Allowance			Recorded			Income
					Balance							Investment			Recognized
With no related allowance recorded:
Commercial
Business loans	$	2,005			$	2,005			$	—		$	4,265		$	—

Energy loans	1,614				3,443				—			969			—

Construction
Market risk	705				705				—			3,111			114

Real estate
Market risk	13,524				13,524				—			9,796			—

Commercial	508				508				—			5,458			—

Secured by 1-4 family	1,320				1,320				—			2,464			—

Consumer	—				—				—			—			—

Equipment leases	—				—				—			—			—

Total impaired loans with no allowance recorded	$	19,676			$	21,505			$	—		$	26,063		$	114

With an allowance recorded:
Commercial
Business loans	$	11,060			$	12,425			$	1,946		$	14,240		$	—

Energy loans	460				460				69			913			—

Construction
Market risk	—				—				—			160			—

Real estate
Market risk	6,289				6,289				822			7,912			—

Commercial	—				—				—			477			—

Secured by 1-4 family	2,387				2,387				321			914			—

Consumer	54				54				8			43			—

Equipment leases	50				50				8			72			—

Total impaired loans with an allowance recorded	$	20,300			$	21,665			$	3,174		$	24,731		$	—

Combined:
Commercial
Business loans	$	13,065			$	14,430			$	1,946		$	18,505		$	—

Energy loans	2,074				3,903				69			1,882			—

Construction

Market risk	705				705				—			3,271			114

Real estate

Market risk	19,813				19,813				822			17,708			—

Commercial	508				508				—			5,935			—

Secured by 1-4 family	3,707				3,707				321			3,378			—

Consumer	54				54				8			43			—

Equipment leases	50				50				8			72			—

Total impaired loans	$	39,976			$	43,170			$	3,174		$	50,794		$	114

Average impaired loans outstanding during the years ended December 31, 2014, 2013 and 2012 totaled $46.4 million, $50.8 million and $66.4 million respectively.
The table below provides an age analysis of our past due loans that are still accruing as of December 31, 2014 (in thousands):


	30-59 Days				60-89 Days				Greater Than			Total Past			Non-accrual			Current			Total
	Past Due				Past Due				90 Days			Due(1)
Commercial
Business loans	$	37,459			$	4,355			$	5,274		$	47,088		$	32,118		$	4,680,114		$	4,759,320

Energy	—				—				—			—			1,004			1,108,895			1,109,899

Mortgage finance loans	—				—				—			—			—			4,102,125			4,102,125

Construction

Market risk	3,571				—				—			3,571			—			1,393,513			1,397,084

Secured by 1-4 family	—				—				—			—			—			19,321			19,321

Real estate

Market risk	—				—				—			—			5,134			2,176,939			2,182,073

Commercial	5,758				—				—			5,758			4,047			523,855			533,660

Secured by 1-4 family	599				—				—			599			766			90,029			91,394

Consumer	43				8				—			51			62			19,586			19,699

Equipment leases	9,396				—				—			9,396			173			89,926			99,495

Total loans held for investment	$	56,826			$	4,363			$	5,274		$	66,463		$	43,304		$	14,204,303		$	14,314,070


-1	Loans past due 90 days and still accruing includes premium finance loans of $3.7 million. These loans are generally secured by obligations of insurance carriers to refund premiums on cancelled 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 contractual interest rate, extension of the maturity date at a contractual interest rate lower than the current rate for new debt with similar risk, or a reduction of the face amount of debt, or forgiveness of either principal or accrued interest. As of December 31, 2014 and December 31, 2013, we had $1.8 million and $1.9 million, respectively, in loans considered restructured that are not on non-accrual. These loans did not have unfunded commitments at December 31, 2014 or 2013. Of the non-accrual loans at December 31, 2014 and 2013, $12.1 million and $17.8 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 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 modified terms in calendar years after the year of the restructure.
The following tables summarize, as of December 31, 2014 and 2013, loans that have been restructured during 2014 and 2013 (in thousands):


December 31, 2014
	Number of			Pre-Restructuring				Post-Restructuring
	Contracts			Outstanding Recorded				Outstanding Recorded
				Investment				Investment
Real estate - commercial	1			$	1,441			$	1,441

Commercial business loans	1			$	95			$	80

Total new restructured loans in 2014	2			$	1,536			$	1,521



December 31, 2013
	Number of			Pre-Restructuring				Post-Restructuring
	Contracts			Outstanding Recorded				Outstanding Recorded
				Investment				Investment
Commercial business loans	3			$	10,823			$	8,921

Real estate market risk	1			892				874

Total new restructured loans in 2013	4			$	11,715			$	9,795

The restructured loans generally include terms to temporarily place the loan on interest only, extend the payment terms or reduce the interest rate. We did not forgive any principal on the above loans. The $15,000 decrease in the post-restructuring recorded investment compared to the pre-restructuring recorded investment is due to paydowns. At December 31, 2014, $1.5 million of the above loans restructured in 2014 are on non-accrual. The restructuring of the loans did not have a significant impact on our allowance for loan losses at December 31, 2014 or 2013.
The following table provides information on how loans were modified as a restructured loan during the year ended December 31, 2014 and 2013 (in thousands):


	December 31,
	2014				2013
Extended maturity	$	1,441			$	874

Adjusted payment schedule	—				—

Combination of maturity extension and payment schedule adjustment	80				8,921

Total	$	1,521			$	9,795

As of December 31, 2014 and 2013, we did not have any loans that were restructured within the last 12 months that subsequently defaulted.

OREO_and_Valuation_Allowance_f

OREO and Valuation Allowance for Losses on OREO	12 Months Ended
	Dec. 31, 2014
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):


		Year ended December 31,
		2014			2013			2012
	Beginning balance	$	5,110		$	15,991		$	34,077

	Additions	851			1,331			3,434

	Sales	(5,393		)	(11,292		)	(14,637		)
	Valuation allowance for OREO	—			958			(4,488		)

	Direct write-downs	—			(1,878		)	(2,395		)

	Ending balance	$	568		$	5,110		$	15,991

Goodwill_and_Other_Intangible_

Goodwill and Other Intangible Assets	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
	In May 2013, we acquired the assets of a premium finance company and recorded a total intangible asset of $2.1 million. Of this total, $954,000 was allocated to goodwill, $554,000 to customer relationships, $457,000 to developed technology and $98,000 to trade name. The $554,000 customer relationship intangible will be amortized over 14 years, the $457,000 technology intangible will be amortized over 7 years, and the $98,000 intangible related to the trade name was determined to have an indefinite life.
	Goodwill and other intangible assets at December 31, 2014 and 2013 are summarized as follows (in thousands):


		Gross Goodwill		Accumulated			Net
		and Intangible		Amortization			Goodwill
		Assets					and
							Intangible
							Assets
	December 31, 2014
	Goodwill	$	15,370	$	(374	)	$	14,996

	Intangible assets—customer relationships and trademarks	9,104		(3,512		)	5,592

	Total goodwill and intangible assets	$	24,474	$	(3,886	)	$	20,588

	December 31, 2013
	Goodwill	$	15,370	$	(374	)	$	14,996

	Intangible assets—customer relationships and trademarks	9,104		(2,814		)	6,290

	Total goodwill and intangible assets	$	24,474	$	(3,188	)	$	21,286

	Amortization expense related to intangible assets totaled $699,000 in 2014, $660,000 in 2013 and $597,000 in 2012. The estimated aggregate future amortization expense for intangible assets remaining as of December 31, 2014 is as follows (in thousands):


	2015	$	598

	2016	501

	2017	474

	2018	473

	2019	473

	Thereafter	3,073

		$	5,592

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Premises and Equipment	Premises and Equipment
	Premises and equipment at December 31, 2014 and 2013 are summarized as follows (in thousands):


		December 31,
		2014			2013
	Premises	$	17,235		$	14,113

	Furniture and equipment	22,418			28,865

		39,653			42,978

	Accumulated depreciation	(22,285		)	(31,496		)
	Total premises and equipment, net	$	17,368		$	11,482

	Depreciation expense for the above premises and equipment was approximately $4,079,000, $3,992,000 and $3,550,000 in 2014, 2013 and 2012, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	Deposits
	Deposits at December 31, 2014 and 2013 were as follows (in thousands):


		2014		2013
	Non-interest-bearing demand deposits	$	5,011,619	$	3,347,567

	Interest-bearing deposits
	Transaction	1,292,388		792,186

	Savings	5,630,253		4,414,680

	Time	426,331		372,639

	Deposits in foreign branches	312,709		330,307

	Total interest-bearing deposits	7,661,681		5,909,812

	Total deposits	$	12,673,300	$	9,257,379

	The scheduled maturities of interest-bearing time deposits were as follows at December 31, 2014 (in thousands):



	2015	$	397,192

	2016	20,514

	2017	4,341

	2018	233

	2019	4,051

	2020 and after	—

		$	426,331

	At December 31, 2014 and 2013, the Bank had approximately $30,171,000 and $27,139,000, respectively, in deposits from related parties, including directors, stockholders, and their related affiliates on terms similar to those from third parties.
	At December 31, 2014 and 2013, interest-bearing time deposits, including deposits in foreign branches, of $250,000 or more were approximately $527,583,000 and $550,678,000, respectively.

Borrowing_Arrangements

Borrowing Arrangements	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Borrowing Arrangements	Borrowing Arrangements
	The following table summarizes our borrowings at December 31, 2014, 2013 and 2012 (in thousands):


		2014				2013						2012
		Balance		Rate(3)		Balance			Rate(3)			Balance				Rate(3)
	Federal funds purchased(4)	$	66,971	0.3	%	$	148,650		0.22	%		$	273,179			0.26	%

	Customer repurchase agreements(1)	25,705		0.38	%	21,954			0.31	%		23,936				0.04	%

	FHLB borrowings(2)	1,100,005		0.13	%	840,026			0.12	%		1,650,046				0.09	%

	Line of credit	—		—	%	15,000			2.65	%		—				—	%

	Subordinated notes	286,000		5.82	%	111,000			6.5	%		111,000				6.5	%

	Trust preferred subordinated debentures	113,406		2.18	%	113,406			2.17	%		113,406				2.24	%

	Total borrowings	$	1,592,087			$	1,250,036					$	2,171,567

	Maximum outstanding at any month end	$	1,592,087			$	1,859,036					$	2,432,945


	-1	Securities pledged for customer repurchase agreements were $21.8 million, $37.7 million and $23.9 million at December 31, 2014, 2013 and 2012, respectively.

	-2	FHLB borrowings are collateralized by a blanket floating lien on certain real estate secured loans, mortgage finance assets and also certain pledged securities. The weighted-average interest rate for the years ended December 31, 2014, 2013 and 2012 was 0.15%, 0.14% and 0.16%, respectively. The average balance of FHLB borrowings for the years ended December 31, 2014, 2013 and 2012 was $213.4 million, $370.0 million and $1.2 billion, respectively.

	-3	Interest rate as of period end.

	-4	The weighted-average interest rate on federal funds purchased for the years ended December 31, 2014, 2013 and 2012 was 0.27%, 0.27% and 0.28%, respectively. The average balance of federal funds purchased for the years ended December 31, 2014, 2013 and 2012 was $139.3 million, $254.3 million and $350.8 million, respectively.
	The following table summarizes our other borrowing capacities in addition to balances outstanding at December 31, 2014, 2013 and 2012 (in thousands):


		2014		2013			2012
	FHLB borrowing capacity relating to loans	$	3,602,994	$	693,302		$	267,542

	FHLB borrowing capacity relating to securities	535		8,482			33,204

	Total FHLB borrowing capacity	$	3,603,529	$	701,784		$	300,746

	Unused Federal funds lines available from commercial banks	$	1,186,000	$	890,000		$	706,000

	Unused Federal Reserve Borrowings capacity	$	2,643,000	$	2,284,000		$	1,940,000

	We had an existing non-revolving amortizing line of credit with $100.0 million of unused capacity that matured on December 15, 2014. This line of credit was renewed on December 23, 2014 with a new maturity date of December 22, 2015. 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 December 31, 2014, no borrowings were outstanding compared to $15.0 million outstanding at December 31, 2013.
	The scheduled maturities of our borrowings at December 31, 2014, were as follows (in thousands):


		Within One		After One			After Three			After Five				Total
		Year		But Within			But Within			Years
				Three Years			Five Years
	Federal funds purchased and customer repurchase agreements(1)	$	92,676	$	—		$	—		$	—			$	92,676

	FHLB borrowings(1)	1,100,005		—			—			—				1,100,005

	Subordinated notes(1)	—		—			—			286,000				286,000

	Trust preferred subordinated debentures(1)	—		—			—			113,406				113,406

	Total borrowings	$	1,192,681	$	—		$	—		$	399,406			$	1,592,087


	-1	Excludes interest.

LongTerm_Debt

Long-Term Debt	12 Months Ended
Long-Term Debt	Dec. 31, 2014
Subordinated Borrowings [Abstract]
Trust Preferred Subordinated Debentures	Long-Term Debt
	From November 2002 to September 2006 various Texas Capital Statutory Trusts were created and subsequently issued floating rate trust preferred securities in various private offerings totaling $113.4 million. As of December 31, 2014, the details of the trust preferred subordinated debentures are summarized below (in thousands):


		Texas Capital	Texas Capital	Texas Capital	Texas Capital	Texas Capital
		Bancshares	Statutory	Statutory	Statutory	Statutory Trust V
		Statutory Trust I	Trust II	Trust III	Trust IV
	Date issued	November 19, 2002	April 10, 2003	October 6, 2005	April 28, 2006	September 29, 2006
	Trust preferred securities issued	$10,310	$10,310	$25,774	$25,774	$41,238
	Floating or fixed rate securities	Floating	Floating	Floating	Floating	Floating
	Interest rate on subordinated debentures	3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR
	Interest rate on subordinated debentures	+ 3.35%	+ 3.25%	+ 1.51%	+ 1.60%	+ 1.71%
	Maturity date	Nov-32	Apr-33	Dec-35	Jun-36	Dec-36
	On September 21, 2012, we issued $111.0 million of subordinated notes. The notes mature in September 2042 and bear interest at a rate of 6.50% per annum, payable quarterly. The indenture governing the notes contains customary covenants and restrictions.
	On January 31, 2014, the Bank issued $175.0 million of subordinated notes in an offering to institutional investors exempt from registration under Section 3(a)(2) of the Securities Act of 1933 and 12 C.F.R. Part 16. Net proceeds from the transaction were $172.4 million. The notes mature in January 2026 and bear interest at a rate of 5.25% per annum, payable semi-annually. The notes are unsecured and are subordinate to the Bank’s obligations to its depositors, its obligations under banker’s acceptances and letters of credit, certain obligations to Federal Reserve Banks and the FDIC and the Bank’s obligations to its other creditors, except any obligations which expressly rank on a parity with or junior to the notes. The notes qualify as Tier 2 capital for regulatory capital purposes, subject to applicable limitations.
	Interest payments on all long-term debt are deductible for federal income tax purposes.
	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.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes
	We have a gross deferred tax asset of $65.5 million and $60.2 million at December 31, 2014 and 2013, respectively, which relates primarily to our allowance for loan losses, loan origination fees and stock compensation. Management believes it is more likely than not that all of the deferred tax assets will be realized. Our net deferred tax asset is included in other assets in the consolidated balance sheet.
	Income tax expense/(benefit) consists of the following for the years ended (in thousands):


		Year ended December 31,
		2014				2013			2012
	Current:
	Federal	$	77,855			$	76,478		$	69,112

	State	2,124				1,878			1,885

	Total	$	79,979			$	78,356		$	70,997

	Deferred
	Federal	$	(3,969	)		$	(11,599	)	$	(3,131	)
	State	—				—			—

	Total	$	(3,969	)		$	(11,599	)	$	(3,131	)
	Total expense
	Federal	$	73,886			$	64,879		$	65,981

	State	2,124				1,878			1,885

	Total	$	76,010			$	66,757		$	67,866

	Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of deferred tax assets and liabilities are as follows (in thousands):


		December 31,
		2014				2013
	Deferred tax assets:
	Allowance for credit losses	$	38,356			$	32,752

	Loan origination fees	13,651				11,580

	Stock compensation	8,263				10,786

	Mark to market on mortgage loans	215				220

	Reserve for potential mortgage loan repurchases	20				20

	Non-accrual interest	1,272				1,907

	Deferred lease expense	1,688				1,316

	Depreciation	691				—

	OREO valuation allowance	22				499

	Other	1,298				1,157

	Total deferred tax assets	65,476				60,237

	Deferred tax liabilities:
	Loan origination costs	(1,488		)		(1,048		)
	Leases	(9,466		)		(6,587		)
	Depreciation	—				(2,224		)

	Unrealized gain on securities	(694		)		(877		)
	Other	(1,914		)		(1,819		)
	Total deferred tax liabilities	(13,562		)		(12,555		)
	Net deferred tax asset	$	51,914			$	47,682

ASC 740-10, Income Taxes — Accounting for Uncertainties in Income Taxes (“ASC 740-10”) prescribes a recognition threshold and a measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. Benefits from tax positions should be recognized in the financial statements only when it is more likely than not that the tax position will be sustained upon examination by the appropriate taxing authority that would have full knowledge of all relevant information. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of cumulative benefit that is greater than fifty percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more-likely-than-not recognition threshold should be recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more-likely-than-not recognition threshold should be derecognized in the first subsequent financial reporting period in which that threshold is no longer met. ASC 740-10 also provides guidance on the accounting for and disclosure of unrecognized tax benefits, interest and penalties.
We file income tax returns in the U.S. federal jurisdiction and several U.S. state jurisdictions. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2011.
The reconciliation of income computed at the U.S. federal statutory tax rates to income tax expense (benefit) is as follows:


	Year ended December 31,
	2014			2013			2012
Tax at U.S. statutory rate	35	%		35	%		35	%
State taxes	1	%		1	%		1	%
Non-deductible expenses	1	%		1	%		1	%
Non-taxable income	(1	)%		(1	)%		(1	)%
Total	36	%		36	%		36	%

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2014
Compensation Related Costs [Abstract]
Employee Benefits	Employee Benefits
	We have a qualified retirement plan, with a salary deferral feature designed to qualify under Section 401 of the Internal Revenue Code (“the 401(k) Plan”). The 401(k) Plan permits our employees to defer a portion of their compensation. Matching contributions may be made in amounts and at times determined by the Company. We contributed approximately $4.5 million, $3.7 million, and $2.7 million for the years ended December 31, 2014, 2013 and 2012, respectively. Employees are eligible to participate in the 401(k) Plan when they meet certain requirements concerning minimum age and period of credited service. All contributions to the 401(k) Plan are invested in accordance with participant elections among certain investment options.
	During 2000, we implemented an Employee Stock Purchase Plan (“ESPP”). Employees are eligible for the plan when they have met certain requirements concerning period of credited service and minimum hours worked. Eligible employees may contribute a minimum of 1% to a maximum of 10% of eligible compensation up to the Section 423 of the Internal Revenue Code limit of $25,000. In 2006, stockholders approved the 2006 ESPP, which allocated 400,000 shares for purchase. As of December 31, 2014, 2013 and 2012, 102,836, 93,388 and 85,013 shares had been purchased on behalf of the employees under the 2006 ESPP.
	As of December 31, 2014, we had three equity-based compensation plans, the 1999 Stock Omnibus Plan (“1999 Plan”), the 2005 Long-Term Incentive Plan (“2005 Plan”) and the 2010 Long-Term Incentive Plan (“2010 Plan”). The 1999 Plan is no longer available for grants of equity based compensation; however, options to purchase shares previously issued under the plan will remain outstanding and be subject to administration by the Human Resources Committee of our board of directors. Under both the 2005 and 2010 Plans, equity-based compensation grants were made by the board of directors, or its designated committee. Grants are subject to vesting requirements. Under the 2005 and 2010 Plans, we may grant, among other things, nonqualified stock options, incentive stock options, restricted stock units (“RSUs”), stock appreciation rights (“SARs”), cash-based performance units or any combination thereof. Both Plans include grants for employees and directors. Total shares authorized under the 2005 plan are 1,500,000, with 700,000 authorized under the 2010 Plan. Total shares which may be issued under the 2005 Plan at December 31, 2014, 2013 and 2012 were 44,655, 43,495 and 26,615, respectively. Total shares which may be issued under the 2010 Plan at December 31, 2014, 2013 and 2012 were 180,120, 218,820 and 363,020, respectively.
	The fair value of our stock option and SAR grants are estimated at the date of grant using the Black-Scholes option pricing model. The Black-Scholes option valuation model was developed for use in estimating the fair value of traded options which have no vesting restrictions and are fully transferable. In addition, option valuation models require the input of highly subjective assumptions including the expected stock price volatility. Because our employee stock options have characteristics significantly different from those of traded options, and because changes in the subjective input assumptions can materially affect the fair value estimate, in management’s opinion, the existing models do not necessarily provide the best single measure of the fair value of its employee stock options.
	The fair value of the options and stock appreciation rights were estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:


		2014			2013			2012
	Risk-free rate	1.46	%		1.17	%		0.76	%
	Market price volatility factor	0.402			0.409			0.404

	Weighted-average expected life of options	5 years			5 years			5 years

	Market price volatility and expected life of options is based on historical data and other factors.
	A summary of our stock option activity and related information for 2014, 2013 and 2012 is as follows:


		December 31, 2014								December 31, 2013							December 31, 2012
		Options				Weighted				Options				Weighted			Options				Weighted
						Average								Average							Average
						Exercise								Exercise							Exercise
						Price								Price							Price
	Options outstanding at beginning of year	54,900				$	18.65			174,062				$	13.51		569,410				$	13.02

	Options exercised	(28,400		)		17.34				(119,162		)		11.14			(391,348		)		12.74

	Options forfeited	(1,500		)		14.91				—				—			(4,000		)		19.37

	Options outstanding at year-end	25,000				$	20.6			54,900				$	18.65		174,062				$	13.51

	Options vested and exercisable at year-end	25,000				$	20.6			54,900				$	18.65		174,062				$	13.51

	Intrinsic value of options vested and exercisable	$	843,190							$	2,391,014						$	5,450,620

	Weighted average remaining contractual life of options vested and exercisable (in years)					0.3								0.97							1.15

	Intrinsic value of options exercised	$	1,193,070							$	4,176,787						$	10,246,387

	Weighted average remaining contractual life of options currently outstanding (in years)					0.3								0.97							1.15

	There was no expense related to stock option awards in 2014, 2013 and 2012. No stock options were granted in 2014, 2013 or 2012.

	Pursuant to the 2010 Long-term Incentive Plan, we granted stock appreciation rights in 2014, 2013 and 2012. These rights are time-vested and generally vest ratably over a period of five years.


		December 31, 2014								December 31, 2013							December 31, 2012
		SARs				Weighted				SARs				Weighted			SARs /				Weighted
						Average								Average			PSARs				Average
						Exercise								Exercise							Exercise
						Price								Price							Price
	SARs outstanding at beginning of year	537,149				$	23.68			640,220				$	20.9		983,700				$	19.56

	SARs granted	8,000				62.02				53,500				43.73			36,000				44.94

	SARs exercised	(92,640		)		20.87				(134,271		)		19.21			(345,480		)		19.44

	SARs forfeited	(7,500		)		31.16				(22,300		)		18.99			(34,000		)		24.79

	SARs outstanding at year-end	445,009				$	24.83			537,149				$	23.68		640,220				$	20.9

	SARs vested and exercisable at year-end	355,509				$	21.16			384,974				$	20.64		446,970				$	20.41

	Weighted average remaining contractual life of SARs vested					2.89								3.46							4.25

Compensation expense	$	530,000							$	564,000						$	704,000

Weighted average fair value of SARs granted					$	23.02							$	16.26						$	16.21

Fair value of shares vested during the year	$	580,345							$	566,341						$	758,543

Weighted average remaining contractual life of SARs currently outstanding (in years)					3.85								4.68							5.19

As of December 31, 2014, 2013 and 2012, the intrinsic value of SARs vested was $11.8 million, $16.0 million and $10.9 million, respectively.
The following table summarizes the status of and changes in our nonvested restricted stock units:


	Non-Vested Stock Awards
	Outstanding
	Number			Weighted-
	of Shares			Average Grant-
				Date Fair Value
Balance, January 1, 2012	661,492			$	17.44

Granted	105,000			39.89

Vested and issued	(311,410	)		18.82

Forfeited	(43,163	)		25.25

Balance, December 31, 2012	411,919			23.8

Granted	163,500			45.35

Vested and issued	(151,480	)		20.47

Forfeited	(20,200	)		24.96

Balance, December 31, 2013	403,739			33.72

Granted	64,050			57.84

Vested and issued	(161,249	)		26.4

Forfeited	(17,375	)		37.4

Balance, December 31, 2014	289,165			$	42.93

The RSUs granted during 2014, 2013 and 2012 vest ratably over four to five years. Compensation cost for restricted stock units was $4,098,000, $3,551,000, $4,875,000 for years ended December 31, 2014, 2013 and 2012, respectively. The weighted average remaining contractual life of RSUs currently outstanding is 8.11 years.
Total compensation cost for all share-based arrangements, net of taxes, was $3,008,000, $2,677,000 and $3,626,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
Unrecognized stock-based compensation expense related to SAR grants issued through December 31, 2014 was $1.1 million. At December 31, 2014, the weighted average period over which this unrecognized expense was expected to be recognized was 3.2 years. Unrecognized stock-based compensation expense related to RSU grants through December 31, 2014 was $10.6 million. At December 31, 2014, the weighted average period over which this unrecognized expense was expected to be recognized was 3.5 years.
Cash flows from financing activities included $2,929,000, $1,200,000 and $7,769,000 in cash inflows from excess tax benefits related to stock compensation in 2014, 2013 and 2012, respectively.
Upon share option exercise, new shares are issued as opposed to treasury shares.
Pursuant to the 2010 Long-term Incentive Plan, we granted a total of 171,808, 173,035 and 344,127 cash-based performance units in 2014, 2013 and 2012, with a total of 502,532 outstanding at December 31, 2014. Of the outstanding units at December 31, 2014, 328,916 are service-based and vest ratably over a period of five years. Additionally, 173,616 units contain both service and performance based vesting requirements: 25-50% of the units will vest on the third anniversary of the date of grant, and the balance will vest based on attainment of certain performance metrics developed by the Human Resources Committee. Since these units have a cash payout feature, they are accounted for under the liability method and the related expense is based on the stock price at period end. Compensation cost for the units was $9,949,000, $17,287,000 and $6,440,000 for the years ended December 31, 2014, 2013, and 2012 respectively. At December 31, 2014, the weighted average remaining contractual life of the units was 8.08 years.
Total compensation cost for all cash-based arrangements, net of taxes, for the years ended December 31, 2014, 2013 and 2012 was $6,467,000, $11,237,000 and $4,186,000, respectively.

Financial_Instruments_with_Off

Financial Instruments with Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2014
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.
	At December 31, 2014 and 2013, commitments to extend credit and standby and commercial letters of credit were as follows (in thousands):


		December 31,
		2014		2013
	Commitments to extend credit	$	5,324,460	$	3,674,391

	Standby letters of credit	177,808		145,662

	At December 31, 2014 and 2013, we had $7.1 million and $4.7 million, respectively, in allowance allocations for these off-balance sheet commitments.

Regulatory_Restrictions

Regulatory Restrictions	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Regulatory Restrictions	Regulatory Restrictions
	The Company and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet minimum capital requirements can initiate certain mandatory (and possibly additional discretionary) actions by regulators that, if undertaken, could have a direct material 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.
	In July 2013, the Federal Reserve published final rules for the adoption of the Basel III regulatory capital framework (the "Basel III Capital Rules"). The Basel III Capital Rules, among other things, (i) introduce a new capital measure called "Common Equity Tier 1," (ii) specify that Tier 1 capital consist of Common Equity Tier 1 and "Additional Tier 1 Capital" instruments meeting specified requirements, (iii) define Common Equity Tier 1 narrowly by requiring that most deductions/adjustments to regulatory capital measures be made to Common Equity Tier 1 and not to the other components of capital and (iv) expand the scope of the deductions/adjustments as compared to existing regulations. The Basel III Capital Rules became effective for us on January 1, 2015 with certain transition provisions fully phased in on January 1, 2019. Based on our initial assessment of the Basel III Capital Rules, we do not believe they will have a material impact on the Company or our bank. We believe we will meet the capital adequacy requirements under the Basel III Capital Rules on a fully phased-in basis when we commence filing 2015 reports with the FDIC and OCC.
	Quantitative measures established by regulation to ensure capital adequacy require the Company and the Bank to maintain minimum amounts and ratios of total and Tier 1 capital to risk-weighted assets, and of Tier 1 capital to average assets, each as defined in the regulations. Management believes, as of December 31, 2014, that the Company and the Bank meet all capital adequacy requirements to which they are subject.
	Financial institutions are categorized as well capitalized or adequately capitalized, based on minimum total risk-based, Tier 1 risk-based 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 December 31, 2014 and 2013. 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 change may retroactively subject the Company to change in capital ratios. Any such change 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 effect on 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 capital ratios:


		Actual				For Capital				To Be Well Capitalized
						Adequacy				Under Prompt Corrective
						Purposes				Action Provisions
	(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
	As of December 31, 2014:
	Total capital (to risk-weighted assets):
	Company	$	1,967,021	11.83	%	$	1,330,568	8	%	N/A		N/A

	Bank	1,757,365		10.57	%	1,330,226		8	%	$	1,662,782	10	%

	Tier 1 capital (to risk-weighted assets):
	Company	$	1,573,007	9.46	%	$	665,284	4	%	N/A		N/A

	Bank	1,424,351		8.57	%	665,113		4	%	$	997,669	6	%

	Tier 1 capital (to average assets):
	Company	$	1,573,007	10.76	%	$	584,765	4	%	N/A		N/A

	Bank	1,424,351		9.75	%	584,597		4	%	$	730,746	5	%

	As of December 31, 2013:
	Total capital (to risk-weighted assets):
	Company	$	1,387,312	10.73	%	$	1,034,721	8	%	N/A		N/A

	Bank	1,328,227		10.27	%	1,034,406		8	%	$	1,293,007	10	%

	Tier 1 capital (to risk-weighted assets):
	Company	$	1,184,018	9.15	%	$	517,361	4	%	N/A		N/A

	Bank	975,933		7.55	%	517,203		4	%	$	775,804	6	%

	Tier 1 capital (to average assets):
	Company	$	1,184,018	10.87	%	$	435,750	4	%	N/A		N/A

	Bank	975,933		8.96	%	435,601		4	%	$	544,502	5	%

	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 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, will further limit the amount of dividends that be paid by our bank. No dividends were declared or paid on our common stock during 2014, 2013 or 2012.
	The required reserve balances at the Federal Reserve at December 31, 2014 and 2013 were approximately $88,155,000 and $51,692,000, respectively.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share
	The following table presents the computation of basic and diluted earnings per share (in thousands except share data):


		Year ended December 31,
		2014		2013		2012
	Numerator:
	Net income	$	136,352	$	121,051	$	120,672

	Preferred stock dividends	9,750		7,394		—

	Net income available to common stockholders	126,602		113,657		120,672

	Denominator:
	Denominator for basic earnings per share—weighted average shares	43,236,344		40,864,225		39,046,340

	Effect of employee stock-based awards(1)	311,423		402,593		645,771

	Effect of warrants to purchase common stock	455,489		513,063		473,736

	Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	44,003,256		41,779,881		40,165,847

	Basic earnings per common share	$	2.93	$	2.78	$	3.09

	Diluted earnings per common share	$	2.88	$	2.72	$	3


	-1	Stock options, SARs and RSUs outstanding of 51,300, 118,500 and 79,500 in 2014, 2013 and 2012, respectively, have not been included in diluted earnings per share because to do so would have been antidilutive for the periods presented. Stock options are antidilutive when the exercise price is higher than the average market price of the Company’s common stock.

Fair_Value_Disclosures

Fair Value Disclosures	12 Months Ended
	Dec. 31, 2014
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.

	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 includes derivative assets and liabilities where values are obtained from independent pricing services.

	Level 3	Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques, as well as instruments for which the determination of fair values requires significant management judgment or estimation. This category also includes impaired loans and OREO where collateral values have been based on third party appraisals; however, due to current economic conditions, comparative sales data typically used in appraisals may be unavailable or more subjective due to lack of market activity.
	Assets and liabilities measured at fair value at December 31, 2014 and 2013 are as follows (in thousands):


		Fair Value Measurements Using
	December 31, 2014	Level 1			Level 2			Level 3
	Available for sale securities:(1)
	Mortgage-backed securities	$	—		$	31,065		$	—

	Municipals	—			3,267			—

	Equity securities(2)	—			7,387			—

	Loans(3)(5)	—			—			23,536

	OREO(4)(5)	—			—			568

	Derivative assets(6)	—			31,176			—

	Derivative liabilities(6)	—			31,176			—


	December 31, 2013
	Available for sale securities:(1)
	Mortgage-backed securities	$	—		$	41,462		$	—

	Municipals	—			14,505			—

	Equity securities(2)	—			7,247			—

	Loans(3)(5)	—			—			13,474

	OREO(4)(5)	—			—			5,110

	Derivative assets(6)	—			14,690			—

	Derivative liabilities(6)	—			14,690			—


	-1	Securities are measured at fair value on a recurring basis, generally monthly.

	-2	Equity securities consist of Community Reinvestment Act funds.

	-3	Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

	-4	OREO is transferred from loans to OREO at fair value less selling costs.

	-5	Fair value of loans and OREO is measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions

	-6	Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.
	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 also include those for which the determination of fair value requires significant management judgment or estimation. Currently, we measure fair value for certain loans on a nonrecurring basis as described below.
	Loans
	During the years ended December 31, 2014 and 2013, certain impaired loans were reevaluated and reported at fair value through a specific valuation allowance allocation of the allowance for possible loan losses based upon the fair value of the underlying collateral. The $23.5 million total above includes impaired loans at December 31, 2014 with a carrying value of $29.2 million that were reduced by specific valuation allowance allocations totaling $5.7 million for a total reported fair value of $23.5 million based on collateral valuations utilizing Level 3 valuation inputs. The $13.5 million total above includes impaired loans at December 31, 2013 with a carrying value of $14.9 million that were reduced by specific valuation allowance allocations totaling $1.4 million for a total reported fair value of $13.5 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, were valued based on third party appraisals. At December 31, 2014 and 2013, OREO had a carrying value of $568,000 and $5.1 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
Generally accepted accounting principles require 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):


	December 31, 2014						December 31, 2013
	Carrying			Estimated			Carrying			Estimated
	Amount			Fair Value			Amount			Fair Value
Cash and cash equivalents	$	1,330,514		$	1,330,514		$	153,911		$	153,911

Securities, available-for-sale	41,719			41,719			63,214			63,214

Loans held for investment, net	14,156,058			14,161,484			11,183,264			11,179,439

Derivative assets	31,176			31,176			14,690			14,690

Deposits	12,673,300			12,673,607			9,257,379			9,257,574

Federal funds purchased	66,971			66,971			148,650			148,650

Customer repurchase agreements	25,705			25,705			21,954			21,954

Other borrowings	1,100,005			1,100,005			855,026			855,026

Subordinated notes	286,000			289,947			111,000			96,647

Trust preferred subordinated debentures	113,406			113,406			113,406			113,406

Derivative liabilities	31,176			31,176			14,690			14,690

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 sheet for cash and cash equivalents approximate their fair value, which is characterized as a Level 1 asset in the fair value hierarchy.
Securities
The fair value of investment securities is based on prices obtained from independent pricing services which are based on quoted market prices for the same or similar securities, which is characterized as a Level 2 asset 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, net
Loans are characterized as Level 3 assets in the fair value hierarchy. For variable-rate loans 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 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. The carrying amount of mortgage finance loans approximates fair value.
Derivatives
The estimated fair value of the interest rate swaps are obtained from independent pricing services based on quoted market prices for the same or similar derivative contracts and are characterized as a Level 2 asset in the fair value hierarchy. On a quarterly basis, we independently verify the fair value using an additional independent pricing source.
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. Fixed-term certificates of deposit fair values 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 sheet for Federal funds purchased, customer repurchase agreements and other short-term, floating rate borrowings approximates their fair value, which is characterized as a Level 2 asset 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, which is characterized as a Level 3 liability in the fair value hierarchy. The subordinated notes are publicly traded and are valued based on market prices, which is characterized as a Level 2 liability in the fair value hierarchy.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies
	We lease various premises under operating leases with various expiration dates ranging from January 2018 through February 2025. Rent expense incurred under operating leases amounted to approximately $13,639,000, $10,216,000 and $8,993,000 for the years ended December 31, 2014, 2013 and 2012, respectively.
	Minimum future lease payments under operating leases are as follows (in thousands):



	Year ending December 31,	Minimum
		Payments
	2015	$	15,557

	2016	15,544

	2017	15,572

	2018	15,534

	2019	15,378

	2020 and thereafter	54,021

		$	131,606

Parent_Company_Only

Parent Company Only	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Parent Company Only	Parent Company Only
	Summarized financial information for Texas Capital Bancshares, Inc. – Parent Company Only follows (in thousands):
	Balance Sheet


		December 31,
		2014				2013
	Assets
	Cash and cash equivalents	$	176,324			$	47,605

	Investment in subsidiaries	1,459,092				1,011,823

	Other assets	82,783				287,734

	Total assets	$	1,718,199			$	1,347,162

	Liabilities and Stockholders’ Equity
	Other liabilities	$	1,328			$	1,254

	Line of credit	—				15,000

	Subordinated notes	111,000				111,000

	Trust preferred subordinated debentures	113,406				113,406

	Total liabilities	225,734				240,660

	Preferred stock	150,000				150,000

	Common stock	457				410

	Additional paid-in capital	719,890				458,360

	Retained earnings	620,837				496,112

	Treasury stock	(8		)		(8		)
	Accumulated other comprehensive income	1,289				1,628

	Total stockholders’ equity	1,492,465				1,106,502

	Total liabilities and stockholders’ equity	$	1,718,199			$	1,347,162


	Statement of Earnings


		Year ended December 31,
		2014				2013				2012
	Loan income	$	10,850			$	10,382			$	1,484

	Dividend income	5,275				76				83

	Other income	28				72				38

	Total income	16,153				10,530				1,605

	Interest expense	10,038				9,863				4,913

	Salaries and employee benefits	617				669				668

	Legal and professional	2,237				2,605				2,094

	Other non-interest expense	933				651				744

Total expense	13,825				13,788				8,419

Income (loss) before income taxes and equity in undistributed income of subsidiary	2,328				(3,258		)		(6,814		)

Income tax expense (benefit)	833				(1,165		)		(2,435		)

Income (loss) before equity in undistributed income of subsidiary	1,495				(2,093		)		(4,379		)

Equity in undistributed income of subsidiary	132,980				123,144				124,951

Net income	134,475				121,051				120,572

Preferred stock dividends	9,750				7,394				—

Net income available to common stockholders	$	124,725			$	113,657			$	120,572


Statements of Cash Flows


	Year ended December 31,
	2014				2013				2012
	(in thousands)
Operating Activities
Net income	$	134,475			$	121,051			$	120,572

Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed income of subsidiary	(132,980		)		(123,144		)		(124,951		)
Increase in other assets	(2,120		)		(2,413		)		(3,793		)
Excess tax benefits from stock-based compensation arrangements	(2,929		)		(1,200		)		(7,769		)
Increase (decrease) in other liabilities	74				37				83

Net cash used in operating activities of continuing operations	(3,480		)		(5,669		)		(15,858		)
Investing Activity
Investments in and advances to subsidiaries	(100,000		)		(240,000		)		(70,000		)
Net cash used in investing activity	(100,000		)		(240,000		)		(70,000		)
Financing Activities
Proceeds from sale of stock related to stock-based awards	(2,203		)		(2,210		)		355

Proceeds from sale of common stock	256,223				—				86,987

Proceeds from issuance of preferred stock	—				144,987				—

Preferred dividends paid	(9,750		)		(6,960		)		—

Issuance of subordinated notes	—				—				111,000

Net other borrowings	(15,000		)		15,000				—

Excess tax benefits from stock-based compensation arrangements	2,929				1,200				7,769

Net cash provided by financing activities	232,199				152,017				206,111

Net increase (decrease) in cash and cash equivalents	128,719				(93,652		)		120,253

Cash and cash equivalents at beginning of year	47,605				141,257				21,004

Cash and cash equivalents at end of year	$	176,324			$	47,605			$	141,257

Related_Party_Transactions

Related Party Transactions	12 Months Ended
Related Party Transactions	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions
Related Party Transactions	See Note 7 for a description of deposits from related parties.

Derivative_Financial_Instrumen

Derivative Financial Instruments	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments
	The fair value of derivative positions outstanding is included in 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 2014 and 2013, 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.
	The notional amounts and estimated fair values of interest rate derivative positions outstanding at December 31, 2014 and 2013 presented in the following table (in thousands):


		December 31, 2014										December 31, 2013
					Estimated Fair Value									Estimated Fair Value
		Notional			Asset Derivative			Liability Derivative				Notional		Asset Derivative			Liability Derivative
		Amount										Amount
	Non-hedging interest rate derivatives:
	Financial institution counterparties:
	Commercial loan/lease interest rate swaps	$	866,432		$	361		$	30,162			$	764,939	$	5,374		$	14,026

	Commercial loan/lease interest rate caps	63,414			$	1,014		—				58,706		664			$	—

	Customer counterparties:

	Commercial loan/lease interest rate swaps	866,432			30,162			361				764,939		14,026			5,374

	Commercial loan/lease interest rate caps	63,414			—			1,014				58,706		—			664

	Gross derivatives				31,537			31,537						20,064			20,064

	Offsetting derivative assets/liabilities				(361		)	(361		)				(5,374		)	(5,374		)
	Net derivatives included in the consolidated balance sheets				$	31,176		$	31,176					$	14,690		$	14,690


	The weighted-average receive and pay interest rates for interest rate swaps outstanding at December 31, 2014 and 2013 were as follows:


		December 31, 2014					December 31, 2013
		Weighted-Average Interest Rate					Weighted-Average Interest Rate
		Received		Paid			Received			Paid
	Non-hedging interest rate swaps	2.79	%	4.82	%		2.99	%		4.89	%
	The weighted-average strike rate for outstanding interest rate caps was 1.44% at December 31, 2014 and 1.87% at December 31, 2013.
	Our credit exposure on interest rate swaps and caps is limited to the net favorable value and interest payments of all swaps and caps by each counterparty. In such cases collateral may be required from the counterparties involved if the net value of the swaps and caps exceeds a nominal amount considered to be immaterial. Our credit exposure, net of any collateral pledged, relating to interest rate swaps and caps was approximately $31.2 million at December 31, 2014 and approximately $14.7 million at December 31, 2013, all of which relates to bank customers. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap and cap values. At December 31, 2014 and 2013, we had $30.2 million and $10.7 million in cash collateral pledged for these derivatives included in interest-bearing deposits.

Stockholders_Equity

Stockholder's Equity	12 Months Ended
Stockholder's Equity	Dec. 31, 2014
Stockholders' Equity Note [Abstract]
Stockholders' Equity	Stockholders’ Equity
	In January 2009, we issued $75 million of perpetual preferred stock and related warrants under the U.S. Department of Treasury’s voluntary Capital Purchase Program. The preferred stock was repurchased in May 2009 and the U.S. Treasury auctioned the related warrants in the first quarter of 2010. As of December 31, 2014, warrants to purchase 581,500 shares at $14.84 per share are still outstanding.
	On March 28, 2013, we completed a sale of 6.0 million shares of 6.5% non-cumulative preferred stock, par value $0.01, with a liquidation preference of $25 per share, in a public offering. Dividends on the preferred stock are not cumulative and will be paid when declared by our board of directors to the extent that we have lawfully available funds to pay dividends. If declared, dividends will accrue and be payable quarterly, in arrears, on the liquidation preference amount, on a non-cumulative basis, at a rate of 6.50% per annum. We paid $9.8 million in dividends on the preferred stock for the year ended December 31, 2014 compared to $7.0 million for the same period of 2013. Holders of preferred stock do not have voting rights, except with respect to authorizing or increasing the authorized amount of senior stock, certain changes in the terms of the preferred stock, certain dividend non-payments and as otherwise required by applicable law. Net proceeds from the sale totaled $145.0 million. The additional equity was used for general corporate purposes, including funding regulatory capital infusions into the Bank.
	In January 2014, we completed an offering of 1.9 million shares of our common stock. Net proceeds from the sale totaled $106.5 million. The net proceeds of the offering were available to the Company for general corporate purposes, including retirement of $15.0 million of short-term debt that was outstanding at December 31, 2013, and additional capital to support continued loan growth.
	On November 12, 2014, we completed a sale of 2.5 million of our common stock in a public offering. Net proceeds from the sale totaled $149.6 million. The additional equity will be used for general corporate purposes and additional capital to support continued loan growth.

Quarterly_Financial_Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Quarterly Financial Information	Quarterly Financial Data (unaudited)
	The tables below summarize our quarterly financial information for the years December 31, 2014 and 2013 (in thousands except per share and average share data):


		2014 Selected Quarterly Financial Data
		Fourth			Third			Second			First
	Interest income	$	137,833		$	135,290		$	124,813		$	116,611

	Interest expense	10,251			9,629			9,406			8,296

	Net interest income	127,582			125,661			115,407			108,315

	Provision for credit losses	6,500			6,500			4,000			5,000

	Net interest income after provision for credit losses	121,082			119,161			111,407			103,315

	Non-interest income	11,226			10,396			10,533			10,356

	Non-interest expense	74,117			71,915			69,765			69,317

	Income before income taxes	58,191			57,642			52,175			44,354

	Income tax expense	20,357			20,810			18,754			16,089

	Net income	37,834			36,832			33,421			28,265

	Preferred stock dividends	2,437			2,438			2,437			2,438

	Net income available to common stockholders	$	35,397		$	34,394		$	30,984		$	25,827

	Basic earnings per share:	$	0.8		$	0.8		$	0.72		$	0.61

	Diluted earnings per share:	$	0.78		$	0.78		$	0.71		$	0.6

	Average shares
	Basic	44,406,000			43,144,000			43,075,000			42,298,000

	Diluted	45,093,000			43,850,000			43,845,000			43,220,000



		2013 Selected Quarterly Financial Data
		Fourth			Third			Second			First
	Interest income	$	117,965		$	115,217		$	107,264		$	104,179

	Interest expense	6,490			6,441			6,044			6,137

	Net interest income	111,475			108,776			101,220			98,042

	Provision for credit losses	5,000			5,000			7,000			2,000

	Net interest income after provision for credit losses	106,475			103,776			94,220			96,042

	Non-interest income	11,184			10,431			11,128			11,281

	Non-interest expense	70,288			62,007			68,733			55,701

	Income before income taxes	47,371			52,200			36,615			51,622

	Income tax expense	17,012			18,724			12,542			18,479

	Net income	30,359			33,476			24,073			33,143

	Preferred stock dividends	$	2,438		$	2,437		$	2,438		$	81

Net income available to common stockholders	$	27,921		$	31,039		$	21,635		$	33,062

Basic earnings per share:	$	0.68		$	0.76		$	0.53		$	0.82

Diluted earnings per share:	$	0.67		$	0.74		$	0.52		$	0.8

Average shares
Basic	40,983,000			40,902,000			40,814,000			40,474,000

Diluted	41,889,000			41,792,000			41,724,000			41,429,000

New_Accounting_Standards

New Accounting Standards	12 Months Ended
New Accounting Standards	Dec. 31, 2014
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
New Accounting Standards	New Accounting Standards

	ASU 2014-04 “Receivables (Topic 310) - Troubled Debt Restructurings by Creditors” (“ASU 2014-04”) amends Topic 310 “Receivables” to clarify the terms defining when an in substance repossession or foreclosure occurs, which determines when the receivable should be derecognized and the real estate property is recognized. ASU 2013-04 is effective for annual periods and interim periods within those annual periods beginning after December 15, 2014. It is not expected to have a significant impact on our consolidated financial statements.

	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 is effective for annual and interim periods beginning after December 15, 2016 and is not expected to have a significant impact on our consolidated financial statements.

	ASU 2014-11 "Transfers and Servicing (Topic 860" ("ASU 2014-11") requires that repurchase-to-maturity transactions be accounted for as secured borrowings consistent with the accounting for other repurchase agreements. The amendments to ASU 2014-11 update the accounting for repurchase-to-maturity transactions and link repurchase financings to secured borrowing accounting, which is consistent with the accounting for other repurchase agreements. ASU 2014-11 also requires two new disclosures. The first disclosure requires an entity to disclose information on transfers accounted for as sales that are economically similar to repurchase agreements. The second disclosure provides added transparency about the types of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. ASU 2014-11 is effective for annual and interim periods beginning after December 15, 2014 and is not expected to have a significant impact on our consolidated financial statements.

	ASU 2014-12 "Compensation - Stock Compensation (Topic 718): Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period" ("ASU 2014-12") requires that a performance target that affects vesting and that could be achieved after the requisite service period be treated as a performance condition. ASU 2014-12 is intended to resolve the diverse accounting treatments of these types of awards in practice and is effective for annual and interim periods beginning after December 15, 2015 and is not expected to have a significant impact on our consolidated financial statements.

Operations_and_Summary_of_Sign1

Operations and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Nature of Business	Organization and Nature of Business
Organization and Nature of Business	Texas Capital Bancshares, Inc. (the "Company”), a Delaware corporation, was incorporated in November 1996 and commenced banking operations in December 1998. The consolidated financial statements of the Company include the accounts of Texas Capital Bancshares, Inc. and its wholly owned subsidiary, Texas Capital Bank, National Association (the "Bank”). We serve the needs of commercial businesses and successful professionals and entrepreneurs located in Texas as well as operate several lines of business serving a regional or national clientele of commercial borrowers. We are primarily a secured lender, with our greatest concentration of loans in Texas.
Basis of Presentation	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.
Use of Estimates	Use of Estimates
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements. Actual results could differ from those estimates. The allowance for loan losses, the fair value of stock-based compensation awards, the fair values of financial instruments and the status of contingencies are particularly susceptible to significant change in the near term.
Cash and Cash Equivalents	Cash and Cash Equivalents
Cash and Cash Equivalents	Cash equivalents include amounts due from banks, interest-bearing deposits and Federal funds sold.
Securities	Securities
	Securities are classified as trading, available-for-sale or held-to-maturity. Management classifies securities at the time of purchase and re-assesses such designation at each balance sheet date; however, transfers between categories from this re-assessment are rare.
	Trading Account
	Securities acquired for resale in anticipation of short-term market movements are classified as trading, with realized and unrealized gains and losses recognized in income. To date, we have not had any activity in our trading account.
	Held-to-Maturity and Available-for-Sale
	Debt securities are classified as held-to-maturity when we have the positive intent and ability to hold the securities to maturity. Held-to-maturity securities are stated at amortized cost. Debt securities not classified as held-to-maturity or trading and marketable equity securities not classified as trading are classified as available-for-sale.
	Available-for-sale securities are stated at fair value, with the unrealized gains and losses reported in a separate component of accumulated other comprehensive income (loss), net of tax. The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity, or in the case of mortgage-backed securities, over the estimated life of the security. Such amortization and accretion is included in interest income from securities. Realized gains and losses and declines in value judged to be other-than-temporary are included in gain (loss) on sale of securities. The cost of securities sold is based on the specific identification method.
	All securities are available-for-sale as of December 31, 2014 and 2013.
Loans	Loans
	Loans Held for Investment
	Loans held for investment (which include equipment leases accounted for as financing leases) are stated at the amount of unpaid principal reduced by deferred income (net of costs). Interest on loans is recognized using the simple-interest method on the daily balances of the principal amounts outstanding. Loan origination fees, net of direct loan origination costs, and commitment fees, are deferred and amortized as an adjustment to yield over the life of the loan, or over the commitment period, as applicable.
	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 loan agreement. Reserves on impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or the fair value of the underlying collateral. Impaired loans, or portions thereof, are charged off when deemed uncollectable.
	The accrual of interest on loans is discontinued 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 book balance of the asset is deemed to be collectible. If collectability is questionable, then cash payments are applied to principal. 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.
	Loans held for investment includes legal ownership interests in mortgage loans that we purchase through our mortgage warehouse lending division. The ownership interests are purchased from unaffiliated mortgage originators who are seeking additional funding through sale of the undivided ownership interests to facilitate their ability to originate loans. The mortgage originator has no obligation to offer and we have no obligation to purchase these interests. The originator closes mortgage loans consistent with underwriting standards established by approved investors, and, at the time of the sale to the investor, our ownership interest and that of the originator are delivered by us to the investor selected by the originator and approved by us. We typically purchase up to a 99% ownership interest in each mortgage with the originator owning the remaining percentage. These mortgage ownership interests are held by us for a period of less than 30 days and more typically 10-20 days. Because of conditions in agreements with originators designed to reduce transaction risks, under Accounting Standards Codification 860, Transfers and Servicing of Financial Assets (“ASC 860”), the ownership interests do not qualify as participating interests. Under ASC 860, the ownership interests are deemed to be loans to the originators and payments we receive from investors are deemed to be payments made by or on behalf of the originator to repay the loan deemed made to the originator. Because we have an actual, legal ownership interest in the underlying residential mortgage loan, these interests are not extensions of credit to the originators that are secured by the mortgage loans as collateral.
	Due to market conditions or events of default by the investor or the originator, we could be required to purchase the remaining interests in the mortgage loans and hold them beyond the expected 10-20 days. Mortgage loans acquired under these conditions would require mark-to-market adjustments to income and could require future allocations of the allowance for loan losses or be subject to charge off in the event the loans become impaired. Mortgage loan interests purchased and disposed of as expected receive no allocation of the allowance for loan losses due to the minimal loss experience with these assets.
Allowance for Loan Losses	Allowance for Loan Losses
Allowance for Loan Losses	The allowance for loan losses is established through a provision for loan losses charged against income. The allowance for loan losses includes specific reserves for impaired loans and a general reserve for estimated losses inherent in the loan portfolio at the balance sheet date, but not yet identified with specific loans. Loans deemed to be uncollectable are charged against the allowance when management believes that the collectability of the principal is unlikely and subsequent recoveries, if any, are credited to the allowance. Management’s periodic evaluation of the adequacy of the allowance is based on an assessment of the current loan portfolio, including known inherent risks, adverse situations that may affect the borrowers’ ability to repay, the estimated value of any underlying collateral and current economic conditions.
Other Real Estate Owned	Other Real Estate Owned
Other Real Estate Owned	Other real estate owned (“OREO”), which is included in other assets on the consolidated balance sheet, consists of real estate that has been foreclosed. Real estate that has been foreclosed is recorded at the fair value of the real estate, less selling costs, through a charge to the allowance for loan losses, if necessary. Subsequent write-downs required for declines in value are recorded through a valuation allowance, or taken directly to the asset, charged to other non-interest expense.
Premises and Equipment	Premises and Equipment
Premises and Equipment	Premises and equipment are stated at cost less accumulated depreciation. Depreciation is computed using the straight-line method over the estimated useful lives of the assets, which range from three to ten years. Gains or losses on disposals of premises and equipment are included in results of operations.
Marketing and Software	Marketing and Software
Marketing and Software	Marketing costs are expensed as incurred. Ongoing maintenance and enhancements of websites are expensed as incurred. Costs incurred in connection with development or purchase of internal use software are capitalized and amortized over a period not to exceed five years. Internal use software costs are included in other assets in the consolidated balance sheets.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets
Goodwill and Other Intangible Assets	Intangible assets are acquired assets that lack physical substance but can be distinguished from goodwill because of contractual or other legal rights or because the asset is capable of being sold or exchanged either on its own or in combination with a related contract, asset, or liability. Our intangible assets relate primarily to loan customer relationships. Intangible assets with definite useful lives are amortized on an accelerated basis over their estimated life. Goodwill and intangible assets are tested for impairment annually or whenever events or changes in circumstances indicate the carrying amount of the assets may not be recoverable from future undiscounted cash flows. If impaired, the assets are recorded at fair value.
Segment Reporting	Segment Reporting
Segment Reporting	We have determined that all of our lending divisions and subsidiaries meet the aggregation criteria of ASC 280, Segment Reporting, since all offer similar products and services, operate with similar processes, and have similar customers.
Stock-based Compensation	Stock-based Compensation
Stock-based Compensation	We account for all stock-based compensation transactions in accordance with ASC 718, Compensation — Stock Compensation (“ASC 718”), which requires that stock compensation transactions be recognized as compensation expense in the consolidated statement of income and other comprehensive income based on their fair values on the measurement date, which is the date of the grant.
Accumulated Other Comprehensive Income	Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income	Unrealized gains or losses on our available-for-sale securities (after applicable income tax expense or benefit) are included in accumulated other comprehensive income, net. Accumulated comprehensive income (loss), net for the three years ended December 31, 2014 is reported in the accompanying consolidated statements of stockholders’ equity and consolidated statements of income and other comprehensive income.
Income Taxes	Income Taxes
Income Taxes	The Company and its subsidiary file a consolidated federal income tax return. We utilize the liability method in accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based upon the difference between the values of the assets and liabilities as reflected in the financial statements and their related tax basis using enacted tax rates in effect for the year in which the differences are expected to be recovered or settled. As changes in tax law or rates are enacted, deferred tax assets and liabilities are adjusted through the provision for income taxes. A valuation reserve is provided against deferred tax assets unless it is more likely than not that such deferred tax assets will be realized.
Basic and Diluted Earnings Per Common Share	Basic and Diluted Earnings Per Common Share
Basic and Diluted Earnings Per Common Share	Basic earnings per common share is based on net income available to common stockholders divided by the weighted-average number of common shares outstanding during the period excluding non-vested stock. Diluted earnings per common share include the dilutive effect of stock options and non-vested stock awards granted using the treasury stock method. A reconciliation of the weighted-average shares used in calculating basic earnings per common share and the weighted average common shares used in calculating diluted earnings per common share for the reported periods is provided in Note 14 — Earnings Per Share.
Fair Values of Financial Instruments	Fair Values of Financial Instruments
Fair Values of Financial Instruments	ASC 820, Fair Value Measurements and Disclosures (“ASC 820”), defines fair value, establishes a framework for measuring fair value under GAAP and enhances disclosures about fair value measurements. In general, fair values of financial instruments are based upon quoted market prices, where available. If such quoted market prices are not available, fair value is 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.

Securities_Tables

Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Available-for-sale Securities [Abstract]
Summary of securities	The following is a summary of securities (in thousands):



		31-Dec-14
		Amortized			Gross			Gross			Estimated
		Cost			Unrealized			Unrealized			Fair
					Gains			Losses			Value
	Available-for-sale securities:
	Residential mortgage-backed securities	$	28,957		$	2,108		$	—		$	31,065

	Municipals	3,257			10			—			3,267

	Equity securities(1)	7,522			16			(151		)	7,387

		$	39,736		$	2,134		$	(151	)	$	41,719




		31-Dec-13
		Amortized			Gross			Gross			Estimated
		Cost			Unrealized			Unrealized			Fair
					Gains			Losses			Value
	Available-for-sale securities:
	Residential mortgage-backed securities	$	38,786		$	2,676		$	—		$	41,462

	Municipals	14,401			104			—			14,505

	Equity securities(1)	7,522			—			(275		)	7,247

		$	60,709		$	2,780		$	(275	)	$	63,214


	-1	Equity securities consist of Community Reinvestment Act funds.
Schedule of amortized cost and estimated fair value of securities	The amortized cost and estimated fair value of securities are presented below by contractual maturity (in thousands, except percentage data):



		31-Dec-14
		Less Than			After One			After Five			After Ten			Total
		One Year			Through			Through			Years
					Five Years			Ten Years
	Available-for-sale:
	Residential mortgage-backed securities:(1)
	Amortized cost	$	1		$	9,151		$	5,661		$	14,144		$	28,957

	Estimated fair value	1			9,662			6,333			15,069			31,065

	Weighted average yield(3)	6.5		%	4.79		%	5.54		%	2.36		%	3.75		%
	Municipals:(2)
	Amortized cost	1,669			1,588			—			—			3,257

	Estimated fair value	1,674			1,593			—			—			3,267

	Weighted average yield(3)	5.78		%	5.79		%	—		%	—		%	5.79		%
	Equity securities:(4)
	Amortized cost	7,522			—			—			—			7,522

	Estimated fair value	7,387			—			—			—			7,387

	Total available-for-sale securities:
	Amortized cost													$	39,736

	Estimated fair value													$	41,719



		31-Dec-13
		Less Than			After One			After Five			After Ten			Total
		One Year			Through			Through			Years
					Five Years			Ten Years
	Available-for-sale:
	Residential mortgage-backed securities:(1)
	Amortized cost	$	238		$	14,720		$	7,718		$	16,110		$	38,786

	Estimated fair value	252			15,641			8,456			17,113			41,462

	Weighted average yield(3)	4.32		%	4.78		%	5.56		%	2.4		%	3.94		%
	Municipals:(2)
	Amortized cost	7,749			6,652			—			—			14,401

	Estimated fair value	7,818			6,687			—			—			14,505

	Weighted average yield(3)	5.76		%	5.71		%	—		%	—		%	5.73		%
	Equity securities:(4)
	Amortized cost	7,522			—			—			—			7,522

	Estimated fair value	7,247			—			—			—			7,247

	Total available-for-sale securities:
	Amortized cost													$	60,709

	Estimated fair value													$	63,214


	-1	Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without prepayment penalties. The average expected life of the mortgage-backed securities was 1.2 years at December 31, 2014 and 1.4 years at December 31, 2013.

	-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 December 31, 2014 and December 31, 2013, 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):



	31-Dec-14	Less Than 12 Months						12 Months or Longer						Total
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
		Value			Loss			Value			Loss			Value			Loss

	Equity securities	$	—		$	—		$	6,349		$	(151	)	$	6,349		$	(151	)


	31-Dec-13	Less Than 12 Months						12 Months or Longer						Total
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
		Value			Loss			Value			Loss			Value			Loss

	Equity securities	$	7,247		$	(275	)	$	—		$	—		$	7,247		$	(275	)

Loans_and_Allowance_for_Credit1

Loans and Allowance for Credit Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Schedule of loans held for investments	Loans held for investment are summarized by category as follows (in thousands):


		December 31,
		2014				2013
	Commercial	$	5,869,219			$	5,020,565

	Mortgage finance	4,102,125				2,784,265

	Construction	1,416,405				1,262,905

	Real estate	2,807,127				2,146,522

	Consumer	19,699				15,350

	Equipment leases	99,495				93,160

	Gross loans held for investment	14,314,070				11,322,767

	Deferred income (net of direct origination costs)	(57,058		)		(51,899		)
	Allowance for loan losses	(100,954		)		(87,604		)
	Total	$	14,156,058			$	11,183,264

Schedule of the credit risk profile of loan portfolio by internally assigned grades and nonaccrual status	The following tables summarize the credit risk profile of our loan portfolio by internally assigned grades and non-accrual status as of December 31, 2014 and 2013 (in thousands):


		Commercial				Mortgage				Construction				Real Estate				Consumer			Equipment Leases			Total
						Finance
	31-Dec-14
	Grade:
	Pass	$	5,738,474			$	4,102,125			$	1,414,671			$	2,785,804			$	19,579		$	91,044		$	14,151,697

	Special mention	53,839				—				1,734				8,723				11			4,363			68,670

	Substandard- accruing	43,784				—				—				2,653				47			3,915			50,399

	Non-accrual	33,122				—				—				9,947				62			173			43,304

	Total loans held for investment	$	5,869,219			$	4,102,125			$	1,416,405			$	2,807,127			$	19,699		$	99,495		$	14,314,070




		Commercial				Mortgage				Construction				Real Estate				Consumer			Equipment Leases			Total
						Finance
	31-Dec-13
	Grade:
	Pass	$	4,908,944			$	2,784,265			$	1,261,995			$	2,099,744			$	15,251		$	89,317		$	11,159,516

	Special mention	24,132				—				102				6,338				—			51			30,623

	Substandard-accruing	74,593				—				103				21,770				45			3,742			100,253

	Non-accrual	12,896				—				705				18,670				54			50			32,375

	Total loans held for investment	$	5,020,565			$	2,784,265			$	1,262,905			$	2,146,522			$	15,350		$	93,160		$	11,322,767

Schedule of activity in the reserve for loan losses by portfolio segment	Allocation of a portion of the reserve to one category of loans does not preclude its availability to absorb losses in other categories.


		Commercial				Mortgage				Construction				Real				Consumer			Equipment Leases			Unallocated			Total
						Finance								Estate
	December 31, 2014
	(in thousands)
	Beginning balance	$	39,868			$	—			$	14,553			$	24,210			$	149		$	3,105		$	5,719		$	87,604

	Provision for loan losses	37,827				—				(6,618		)		(8,411		)		195			(3,046		)	(317		)	19,630

	Charge-offs	9,803				—								296				266			—			—			10,365

	Recoveries	2,762				—								79				162			1,082			—			4,085

	Net charge-offs (recoveries)	7,041				—				—				217				104			(1,082		)	—			6,280

	Ending balance	$	70,654			$	—			$	7,935			$	15,582			$	240		$	1,141		$	5,402		$	100,954

	Period end amount allocated to:
	Loans individually evaluated for impairment	$	7,705			$	—			$	—			$	636			$	9		$	26		$	—		$	8,376

	Loans collectively evaluated for impairment	62,949				—				7,935				14,946				231			1,115			5,402			92,578

	Ending balance	$	70,654			$	—			$	7,935			$	15,582			$	240		$	1,141		$	5,402		$	100,954

		Commercial				Mortgage				Construction				Real				Consumer			Equipment Leases			Unallocated			Total
						Finance								Estate
	December 31, 2013
	(in thousands)
	Beginning balance	$	21,547			$	—			$	12,097			$	30,893			$	226		$	2,460		$	7,114		$	74,337

	Provision for loan losses	23,693				—				2,456				(6,809		)		(105		)	325			(1,395		)	18,165

	Charge-offs	6,575				—				—				144				45			2			—			6,766

	Recoveries	1,203				—				—				270				73			322			—			1,868

	Net charge-offs (recoveries)	5,372				—				—				(126		)		(28		)	(320		)	—			4,898

	Ending balance	$	39,868			$	—			$	14,553			$	24,210			$	149		$	3,105		$	5,719		$	87,604

	Period end amount allocated to:
	Loans individually evaluated for impairment	$	2,015			$	—			$	—			$	1,143			$	8		$	8		$	—		$	3,174

	Loans collectively evaluated for impairment	37,853				—				14,553				23,067				141			3,097			5,719			84,430

	Ending balance	$	39,868			$	—			$	14,553			$	24,210			$	149		$	3,105		$	5,719		$	87,604

Schedule of recorded investment in loans related to each balance in the allowance for loan losses	Our recorded investment in loans as of December 31, 2014 and 2013 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):


		Commercial				Mortgage				Construction				Real				Consumer			Equipment Leases			Total
						Finance								Estate
	31-Dec-14
	Loans individually evaluated for impairment	$	35,165			$	—			$	—			$	13,880			$	62		$	173		$	49,280

	Loans collectively evaluated for impairment	5,834,054				4,102,125				1,416,405				2,793,247				19,637			99,322			14,264,790

	Total	$	5,869,219			$	4,102,125			$	1,416,405			$	2,807,127			$	19,699		$	99,495		$	14,314,070



		Commercial				Mortgage				Construction				Real				Consumer			Equipment Leases			Total
						Finance								Estate
	31-Dec-13
	Loans individually evaluated for impairment	$	15,139			$	—			$	705			$	24,028			$	54		$	50		$	39,976

	Loans collectively evaluated for impairment	5,005,426				2,784,265				1,262,200				2,122,494				15,296			93,110			11,282,791

	Total	$	5,020,565			$	2,784,265			$	1,262,905			$	2,146,522			$	15,350		$	93,160		$	11,322,767

Schedule of impaired loans, by portfolio class	The following tables detail our impaired loans, by portfolio class as of December 31, 2014 and 2013 (in thousands):


	31-Dec-14
		Recorded				Unpaid				Related				Average				Interest
		Investment				Principal				Allowance				Recorded				Income
						Balance								Investment				Recognized
	With no related allowance recorded:
	Commercial
	Business loans	$	9,608			$	11,857			$	—			$	7,334			$	—

	Energy loans	—				—				—				375				25

	Construction
	Market risk	—				—				—				118				—

	Real estate
	Market risk	3,735				3,735				—				7,970				—

	Commercial	3,521				3,521				—				2,795				—

	Secured by 1-4 family	—				—				—				1,210				—

	Consumer	—				—				—				—				—

	Equipment leases	—				—				—				—				—

	Total impaired loans with no allowance recorded	$	16,864			$	19,113			$	—			$	19,802			$	25

	With an allowance recorded:
	Commercial
	Business loans	$	24,553			$	25,553			$	7,433			$	17,705			$	—

	Energy loans	1,004				1,004				272				991				—

	Construction
	Market risk	—				—				—				—				—

	Real estate
	Market risk	4,203				4,203				317				5,064				—

	Commercial	526				526				79				705				—

	Secured by 1-4 family	1,895				1,895				240				2,119				—

	Consumer	62				62				9				16				—

	Equipment leases	173				173				26				41				—

	Total impaired loans with an allowance recorded	$	32,416			$	33,416			$	8,376			$	26,641			$	—

	Combined:
	Commercial
	Business loans	$	34,161			$	37,410			$	7,433			$	25,039			$	—

	Energy loans	1,004				1,004				272				1,366				25

	Construction
	Market risk	—				—				—				118				—

	Real estate
	Market risk	7,938				7,938				317				13,034				—

	Commercial	4,047				4,047				79				3,500				—

Secured by 1-4 family	1,895				1,895				240				3,329				—

Consumer	62				62				9				16				—

Equipment leases	173				173				26				41				—

Total impaired loans	$	49,280			$	52,529			$	8,376			$	46,443			$	25



31-Dec-13
	Recorded				Unpaid				Related				Average				Interest
	Investment				Principal				Allowance				Recorded				Income
					Balance								Investment				Recognized
With no related allowance recorded:
Commercial
Business loans	$	2,005			$	2,005			$	—			$	4,265			$	—

Energy loans	1,614				3,443				—				969				—

Construction
Market risk	705				705				—				3,111				114

Real estate
Market risk	13,524				13,524				—				9,796				—

Commercial	508				508				—				5,458				—

Secured by 1-4 family	1,320				1,320				—				2,464				—

Consumer	—				—				—				—				—

Equipment leases	—				—				—				—				—

Total impaired loans with no allowance recorded	$	19,676			$	21,505			$	—			$	26,063			$	114

With an allowance recorded:
Commercial
Business loans	$	11,060			$	12,425			$	1,946			$	14,240			$	—

Energy loans	460				460				69				913				—

Construction
Market risk	—				—				—				160				—

Real estate
Market risk	6,289				6,289				822				7,912				—

Commercial	—				—				—				477				—

Secured by 1-4 family	2,387				2,387				321				914				—

Consumer	54				54				8				43				—

Equipment leases	50				50				8				72				—

Total impaired loans with an allowance recorded	$	20,300			$	21,665			$	3,174			$	24,731			$	—

Combined:
Commercial
Business loans	$	13,065			$	14,430			$	1,946			$	18,505			$	—

Energy loans	2,074				3,903				69				1,882				—

Construction

Market risk	705				705				—				3,271				114

Real estate

Market risk	19,813				19,813				822				17,708				—

Commercial	508				508				—				5,935				—

Secured by 1-4 family	3,707				3,707				321				3,378				—

Consumer	54				54				8				43				—

Equipment leases	50				50				8				72				—

Total impaired loans	$	39,976			$	43,170			$	3,174			$	50,794			$	114

Schedule of an age analysis of accruing past due loans	The table below provides an age analysis of our past due loans that are still accruing as of December 31, 2014 (in thousands):


		30-59 Days				60-89 Days				Greater Than				Total Past				Non-accrual			Current			Total
		Past Due				Past Due				90 Days				Due(1)
	Commercial
	Business loans	$	37,459			$	4,355			$	5,274			$	47,088			$	32,118		$	4,680,114		$	4,759,320

	Energy	—				—				—				—				1,004			1,108,895			1,109,899

	Mortgage finance loans	—				—				—				—				—			4,102,125			4,102,125

	Construction

	Market risk	3,571				—				—				3,571				—			1,393,513			1,397,084

	Secured by 1-4 family	—				—				—				—				—			19,321			19,321

	Real estate

	Market risk	—				—				—				—				5,134			2,176,939			2,182,073

	Commercial	5,758				—				—				5,758				4,047			523,855			533,660

	Secured by 1-4 family	599				—				—				599				766			90,029			91,394

	Consumer	43				8				—				51				62			19,586			19,699

	Equipment leases	9,396				—				—				9,396				173			89,926			99,495

	Total loans held for investment	$	56,826			$	4,363			$	5,274			$	66,463			$	43,304		$	14,204,303		$	14,314,070


	-1	Loans past due 90 days and still accruing includes premium finance loans of $3.7 million. These loans are generally secured by obligations of insurance carriers to refund premiums on cancelled 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 provides information on how loans were modified as a restructured loan during the year ended December 31, 2014 and 2013 (in thousands):


		December 31,
		2014				2013
	Extended maturity	$	1,441			$	874

	Adjusted payment schedule	—				—

	Combination of maturity extension and payment schedule adjustment	80				8,921

	Total	$	1,521			$	9,795

	The following tables summarize, as of December 31, 2014 and 2013, loans that have been restructured during 2014 and 2013 (in thousands):


	December 31, 2014
		Number of			Pre-Restructuring				Post-Restructuring
		Contracts			Outstanding Recorded				Outstanding Recorded
					Investment				Investment
	Real estate - commercial	1			$	1,441			$	1,441

	Commercial business loans	1			$	95			$	80

	Total new restructured loans in 2014	2			$	1,536			$	1,521



	December 31, 2013
		Number of			Pre-Restructuring				Post-Restructuring
		Contracts			Outstanding Recorded				Outstanding Recorded
					Investment				Investment
	Commercial business loans	3			$	10,823			$	8,921

	Real estate market risk	1			892				874

	Total new restructured loans in 2013	4			$	11,715			$	9,795

OREO_and_Valuation_Allowance_f1

OREO and Valuation Allowance for Losses on OREO (Tables)	12 Months Ended
	Dec. 31, 2014
Real Estate Owned, Disclosure of Detailed Components [Abstract]
Summary of the activity related to OREO	The table below presents a summary of the activity related to OREO (in thousands):


		Year ended December 31,
		2014			2013			2012
	Beginning balance	$	5,110		$	15,991		$	34,077

	Additions	851			1,331			3,434

	Sales	(5,393		)	(11,292		)	(14,637		)
	Valuation allowance for OREO	—			958			(4,488		)

	Direct write-downs	—			(1,878		)	(2,395		)

	Ending balance	$	568		$	5,110		$	15,991

Goodwill_and_Other_Intangible_1

Goodwill and Other Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of goodwill and other intangible assets	Goodwill and other intangible assets at December 31, 2014 and 2013 are summarized as follows (in thousands):


		Gross Goodwill		Accumulated			Net
		and Intangible		Amortization			Goodwill
		Assets					and
							Intangible
							Assets
	December 31, 2014
	Goodwill	$	15,370	$	(374	)	$	14,996

	Intangible assets—customer relationships and trademarks	9,104		(3,512		)	5,592

	Total goodwill and intangible assets	$	24,474	$	(3,886	)	$	20,588

	December 31, 2013
	Goodwill	$	15,370	$	(374	)	$	14,996

	Intangible assets—customer relationships and trademarks	9,104		(2,814		)	6,290

	Total goodwill and intangible assets	$	24,474	$	(3,188	)	$	21,286

Schedule of estimated aggregate future amortization expense for intangible assets	The estimated aggregate future amortization expense for intangible assets remaining as of December 31, 2014 is as follows (in thousands):


	2015	$	598

	2016	501

	2017	474

	2018	473

	2019	473

	Thereafter	3,073

		$	5,592

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Summary of premises and equipment	Premises and equipment at December 31, 2014 and 2013 are summarized as follows (in thousands):


		December 31,
		2014			2013
	Premises	$	17,235		$	14,113

	Furniture and equipment	22,418			28,865

		39,653			42,978

	Accumulated depreciation	(22,285		)	(31,496		)
	Total premises and equipment, net	$	17,368		$	11,482

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Schedule of deposits	Deposits at December 31, 2014 and 2013 were as follows (in thousands):


		2014		2013
	Non-interest-bearing demand deposits	$	5,011,619	$	3,347,567

	Interest-bearing deposits
	Transaction	1,292,388		792,186

	Savings	5,630,253		4,414,680

	Time	426,331		372,639

	Deposits in foreign branches	312,709		330,307

	Total interest-bearing deposits	7,661,681		5,909,812

	Total deposits	$	12,673,300	$	9,257,379

Schedule of maturities of interest-bearing time deposits	The scheduled maturities of interest-bearing time deposits were as follows at December 31, 2014 (in thousands):



	2015	$	397,192

	2016	20,514

	2017	4,341

	2018	233

	2019	4,051

	2020 and after	—

		$	426,331

Borrowing_Arrangements_Tables

Borrowing Arrangements (Tables)	12 Months Ended
	Dec. 31, 2014
Debt Disclosure [Abstract]
Summary of borrowings	The following table summarizes our borrowings at December 31, 2014, 2013 and 2012 (in thousands):


		2014				2013						2012
		Balance		Rate(3)		Balance			Rate(3)			Balance				Rate(3)
	Federal funds purchased(4)	$	66,971	0.3	%	$	148,650		0.22	%		$	273,179			0.26	%

	Customer repurchase agreements(1)	25,705		0.38	%	21,954			0.31	%		23,936				0.04	%

	FHLB borrowings(2)	1,100,005		0.13	%	840,026			0.12	%		1,650,046				0.09	%

	Line of credit	—		—	%	15,000			2.65	%		—				—	%

	Subordinated notes	286,000		5.82	%	111,000			6.5	%		111,000				6.5	%

	Trust preferred subordinated debentures	113,406		2.18	%	113,406			2.17	%		113,406				2.24	%

	Total borrowings	$	1,592,087			$	1,250,036					$	2,171,567

	Maximum outstanding at any month end	$	1,592,087			$	1,859,036					$	2,432,945


	-1	Securities pledged for customer repurchase agreements were $21.8 million, $37.7 million and $23.9 million at December 31, 2014, 2013 and 2012, respectively.

	-2	FHLB borrowings are collateralized by a blanket floating lien on certain real estate secured loans, mortgage finance assets and also certain pledged securities. The weighted-average interest rate for the years ended December 31, 2014, 2013 and 2012 was 0.15%, 0.14% and 0.16%, respectively. The average balance of FHLB borrowings for the years ended December 31, 2014, 2013 and 2012 was $213.4 million, $370.0 million and $1.2 billion, respectively.

	-3	Interest rate as of period end.

	-4	The weighted-average interest rate on federal funds purchased for the years ended December 31, 2014, 2013 and 2012 was 0.27%, 0.27% and 0.28%, respectively. The average balance of federal funds purchased for the years ended December 31, 2014, 2013 and 2012 was $139.3 million, $254.3 million and $350.8 million, respectively.
Summary of other borrowing capacities	The following table summarizes our other borrowing capacities in addition to balances outstanding at December 31, 2014, 2013 and 2012 (in thousands):


		2014		2013			2012
	FHLB borrowing capacity relating to loans	$	3,602,994	$	693,302		$	267,542

	FHLB borrowing capacity relating to securities	535		8,482			33,204

	Total FHLB borrowing capacity	$	3,603,529	$	701,784		$	300,746

	Unused Federal funds lines available from commercial banks	$	1,186,000	$	890,000		$	706,000

	Unused Federal Reserve Borrowings capacity	$	2,643,000	$	2,284,000		$	1,940,000

Schedule of maturities of borrowings	The scheduled maturities of our borrowings at December 31, 2014, were as follows (in thousands):


		Within One		After One			After Three			After Five				Total
		Year		But Within			But Within			Years
				Three Years			Five Years
	Federal funds purchased and customer repurchase agreements(1)	$	92,676	$	—		$	—		$	—			$	92,676

	FHLB borrowings(1)	1,100,005		—			—			—				1,100,005

	Subordinated notes(1)	—		—			—			286,000				286,000

	Trust preferred subordinated debentures(1)	—		—			—			113,406				113,406

	Total borrowings	$	1,192,681	$	—		$	—		$	399,406			$	1,592,087


	-1	Excludes interest.

LongTerm_Debt_Tables

Long-Term Debt (Tables)	12 Months Ended
Long-Term Debt (Tables)	Dec. 31, 2014
Subordinated Borrowings [Abstract]
Schedule of details of the trust preferred subordinated debentures	As of December 31, 2014, the details of the trust preferred subordinated debentures are summarized below (in thousands):


		Texas Capital	Texas Capital	Texas Capital	Texas Capital	Texas Capital
		Bancshares	Statutory	Statutory	Statutory	Statutory Trust V
		Statutory Trust I	Trust II	Trust III	Trust IV
	Date issued	November 19, 2002	April 10, 2003	October 6, 2005	April 28, 2006	September 29, 2006
	Trust preferred securities issued	$10,310	$10,310	$25,774	$25,774	$41,238
	Floating or fixed rate securities	Floating	Floating	Floating	Floating	Floating
	Interest rate on subordinated debentures	3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR	3 month LIBOR
	Interest rate on subordinated debentures	+ 3.35%	+ 3.25%	+ 1.51%	+ 1.60%	+ 1.71%
	Maturity date	Nov-32	Apr-33	Dec-35	Jun-36	Dec-36

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Schedule of income tax expense/(benefit)	Income tax expense/(benefit) consists of the following for the years ended (in thousands):


		Year ended December 31,
		2014				2013				2012
	Current:
	Federal	$	77,855			$	76,478			$	69,112

	State	2,124				1,878				1,885

	Total	$	79,979			$	78,356			$	70,997

	Deferred
	Federal	$	(3,969	)		$	(11,599	)		$	(3,131	)
	State	—				—				—

	Total	$	(3,969	)		$	(11,599	)		$	(3,131	)
	Total expense
	Federal	$	73,886			$	64,879			$	65,981

	State	2,124				1,878				1,885

	Total	$	76,010			$	66,757			$	67,866

Schedule of deferred tax assets and liabilities	Significant components of deferred tax assets and liabilities are as follows (in thousands):


		December 31,
		2014				2013
	Deferred tax assets:
	Allowance for credit losses	$	38,356			$	32,752

	Loan origination fees	13,651				11,580

	Stock compensation	8,263				10,786

	Mark to market on mortgage loans	215				220

	Reserve for potential mortgage loan repurchases	20				20

	Non-accrual interest	1,272				1,907

	Deferred lease expense	1,688				1,316

	Depreciation	691				—

	OREO valuation allowance	22				499

	Other	1,298				1,157

	Total deferred tax assets	65,476				60,237

	Deferred tax liabilities:
	Loan origination costs	(1,488		)		(1,048		)
	Leases	(9,466		)		(6,587		)
	Depreciation	—				(2,224		)

	Unrealized gain on securities	(694		)		(877		)
	Other	(1,914		)		(1,819		)
	Total deferred tax liabilities	(13,562		)		(12,555		)
	Net deferred tax asset	$	51,914			$	47,682

Reconciliation of income attributable to continuing operations	The reconciliation of income computed at the U.S. federal statutory tax rates to income tax expense (benefit) is as follows:


		Year ended December 31,
		2014			2013			2012
	Tax at U.S. statutory rate	35	%		35	%		35	%
	State taxes	1	%		1	%		1	%
	Non-deductible expenses	1	%		1	%		1	%
	Non-taxable income	(1	)%		(1	)%		(1	)%
	Total	36	%		36	%		36	%

Employee_Benefits_Tables

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Compensation Related Costs [Abstract]
Schedule of weighted-average assumptions	The fair value of the options and stock appreciation rights were estimated at the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:


		2014			2013			2012
	Risk-free rate	1.46	%		1.17	%		0.76	%
	Market price volatility factor	0.402			0.409			0.404

	Weighted-average expected life of options	5 years			5 years			5 years

Summary of stock option activity	A summary of our stock option activity and related information for 2014, 2013 and 2012 is as follows:


		December 31, 2014								December 31, 2013					December 31, 2012
		Options				Weighted				Options			Weighted		Options			Weighted
						Average							Average					Average
						Exercise							Exercise					Exercise
						Price							Price					Price
	Options outstanding at beginning of year	54,900				$	18.65			174,062			$	13.51	569,410			$	13.02

	Options exercised	(28,400		)		17.34				(119,162		)	11.14		(391,348		)	12.74

	Options forfeited	(1,500		)		14.91				—			—		(4,000		)	19.37

	Options outstanding at year-end	25,000				$	20.6			54,900			$	18.65	174,062			$	13.51

	Options vested and exercisable at year-end	25,000				$	20.6			54,900			$	18.65	174,062			$	13.51

	Intrinsic value of options vested and exercisable	$	843,190							$	2,391,014				$	5,450,620

	Weighted average remaining contractual life of options vested and exercisable (in years)					0.3							0.97					1.15

	Intrinsic value of options exercised	$	1,193,070							$	4,176,787				$	10,246,387

	Weighted average remaining contractual life of options currently outstanding (in years)					0.3							0.97					1.15

Schedule of stock appreciation rights activity	These rights are time-vested and generally vest ratably over a period of five years.


		December 31, 2014								December 31, 2013					December 31, 2012
		SARs				Weighted				SARs			Weighted		SARs /			Weighted
						Average							Average		PSARs			Average
						Exercise							Exercise					Exercise
						Price							Price					Price
	SARs outstanding at beginning of year	537,149				$	23.68			640,220			$	20.9	983,700			$	19.56

	SARs granted	8,000				62.02				53,500			43.73		36,000			44.94

	SARs exercised	(92,640		)		20.87				(134,271		)	19.21		(345,480		)	19.44

	SARs forfeited	(7,500		)		31.16				(22,300		)	18.99		(34,000		)	24.79

	SARs outstanding at year-end	445,009				$	24.83			537,149			$	23.68	640,220			$	20.9

	SARs vested and exercisable at year-end	355,509				$	21.16			384,974			$	20.64	446,970			$	20.41

	Weighted average remaining contractual life of SARs vested					2.89							3.46					4.25

	Compensation expense	$	530,000							$	564,000				$	704,000

	Weighted average fair value of SARs granted					$	23.02						$	16.26				$	16.21

	Fair value of shares vested during the year	$	580,345							$	566,341				$	758,543

	Weighted average remaining contractual life of SARs currently outstanding (in years)					3.85							4.68					5.19

Summary of status and changes in nonvested restricted stock units	The following table summarizes the status of and changes in our nonvested restricted stock units:


		Non-Vested Stock Awards
		Outstanding
		Number			Weighted-
		of Shares			Average Grant-
					Date Fair Value
	Balance, January 1, 2012	661,492			$	17.44

	Granted	105,000			39.89

	Vested and issued	(311,410	)		18.82

	Forfeited	(43,163	)		25.25

	Balance, December 31, 2012	411,919			23.8

	Granted	163,500			45.35

	Vested and issued	(151,480	)		20.47

	Forfeited	(20,200	)		24.96

	Balance, December 31, 2013	403,739			33.72

	Granted	64,050			57.84

	Vested and issued	(161,249	)		26.4

	Forfeited	(17,375	)		37.4

	Balance, December 31, 2014	289,165			$	42.93

Financial_Instruments_with_Off1

Financial Instruments with Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2014
Risks and Uncertainties [Abstract]
Schedule of financial instruments with off-balance sheet risk	At December 31, 2014 and 2013, commitments to extend credit and standby and commercial letters of credit were as follows (in thousands):


		December 31,
		2014		2013
	Commitments to extend credit	$	5,324,460	$	3,674,391

	Standby letters of credit	177,808		145,662

	At December 31, 2014 and 2013, we had $7.1 million and $4.7 million, respectively, in allowance allocations for these off-balance sheet commitments.

Regulatory_Restrictions_Tables

Regulatory Restrictions (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Capital Requirements [Abstract]
Schedule of compliance with Regulatory Capital Requirements	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 capital ratios:


		Actual				For Capital				To Be Well Capitalized
						Adequacy				Under Prompt Corrective
						Purposes				Action Provisions
	(Dollars in thousands)	Amount		Ratio		Amount		Ratio		Amount		Ratio
	As of December 31, 2014:
	Total capital (to risk-weighted assets):
	Company	$	1,967,021	11.83	%	$	1,330,568	8	%	N/A		N/A

	Bank	1,757,365		10.57	%	1,330,226		8	%	$	1,662,782	10	%

	Tier 1 capital (to risk-weighted assets):
	Company	$	1,573,007	9.46	%	$	665,284	4	%	N/A		N/A

	Bank	1,424,351		8.57	%	665,113		4	%	$	997,669	6	%

	Tier 1 capital (to average assets):
	Company	$	1,573,007	10.76	%	$	584,765	4	%	N/A		N/A

	Bank	1,424,351		9.75	%	584,597		4	%	$	730,746	5	%

	As of December 31, 2013:
	Total capital (to risk-weighted assets):
	Company	$	1,387,312	10.73	%	$	1,034,721	8	%	N/A		N/A

	Bank	1,328,227		10.27	%	1,034,406		8	%	$	1,293,007	10	%

	Tier 1 capital (to risk-weighted assets):
	Company	$	1,184,018	9.15	%	$	517,361	4	%	N/A		N/A

	Bank	975,933		7.55	%	517,203		4	%	$	775,804	6	%

	Tier 1 capital (to average assets):
	Company	$	1,184,018	10.87	%	$	435,750	4	%	N/A		N/A

	Bank	975,933		8.96	%	435,601		4	%	$	544,502	5	%

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
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 share data):


		Year ended December 31,
		2014		2013		2012
	Numerator:
	Net income	$	136,352	$	121,051	$	120,672

	Preferred stock dividends	9,750		7,394		—

	Net income available to common stockholders	126,602		113,657		120,672

	Denominator:
	Denominator for basic earnings per share—weighted average shares	43,236,344		40,864,225		39,046,340

	Effect of employee stock-based awards(1)	311,423		402,593		645,771

	Effect of warrants to purchase common stock	455,489		513,063		473,736

	Denominator for dilutive earnings per share—adjusted weighted average shares and assumed conversions	44,003,256		41,779,881		40,165,847

	Basic earnings per common share	$	2.93	$	2.78	$	3.09

	Diluted earnings per common share	$	2.88	$	2.72	$	3


	-1	Stock options, SARs and RSUs outstanding of 51,300, 118,500 and 79,500 in 2014, 2013 and 2012, respectively, have not been included in diluted earnings per share because to do so would have been antidilutive for the periods presented. Stock options are antidilutive when the exercise price is higher than the average market price of the Company’s common stock.

Fair_Value_Disclosures_Tables

Fair Value Disclosures (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Schedule of assets and liabilities measured at fair value	Assets and liabilities measured at fair value at December 31, 2014 and 2013 are as follows (in thousands):


		Fair Value Measurements Using
	December 31, 2014	Level 1		Level 2		Level 3
	Available for sale securities:(1)
	Mortgage-backed securities	$	—	$	31,065	$	—

	Municipals	—		3,267		—

	Equity securities(2)	—		7,387		—

	Loans(3)(5)	—		—		23,536

	OREO(4)(5)	—		—		568

	Derivative assets(6)	—		31,176		—

	Derivative liabilities(6)	—		31,176		—


	December 31, 2013
	Available for sale securities:(1)
	Mortgage-backed securities	$	—	$	41,462	$	—

	Municipals	—		14,505		—

	Equity securities(2)	—		7,247		—

	Loans(3)(5)	—		—		13,474

	OREO(4)(5)	—		—		5,110

	Derivative assets(6)	—		14,690		—

	Derivative liabilities(6)	—		14,690		—


	-1	Securities are measured at fair value on a recurring basis, generally monthly.

	-2	Equity securities consist of Community Reinvestment Act funds.

	-3	Includes impaired loans that have been measured for impairment at the fair value of the loan’s collateral.

	-4	OREO is transferred from loans to OREO at fair value less selling costs.

	-5	Fair value of loans and OREO is measured on a nonrecurring basis, generally annually or more often as warranted by market and economic conditions

	-6	Derivative assets and liabilities are measured at fair value on a recurring basis, generally quarterly.
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):


		December 31, 2014				December 31, 2013
		Carrying		Estimated		Carrying		Estimated
		Amount		Fair Value		Amount		Fair Value
	Cash and cash equivalents	$	1,330,514	$	1,330,514	$	153,911	$	153,911

	Securities, available-for-sale	41,719		41,719		63,214		63,214

	Loans held for investment, net	14,156,058		14,161,484		11,183,264		11,179,439

	Derivative assets	31,176		31,176		14,690		14,690

	Deposits	12,673,300		12,673,607		9,257,379		9,257,574

	Federal funds purchased	66,971		66,971		148,650		148,650

	Customer repurchase agreements	25,705		25,705		21,954		21,954

	Other borrowings	1,100,005		1,100,005		855,026		855,026

	Subordinated notes	286,000		289,947		111,000		96,647

	Trust preferred subordinated debentures	113,406		113,406		113,406		113,406

	Derivative liabilities	31,176		31,176		14,690		14,690

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]
Schedule of minimum future lease payments under operating leases	Minimum future lease payments under operating leases are as follows (in thousands):



	Year ending December 31,	Minimum
		Payments
	2015	$	15,557

	2016	15,544

	2017	15,572

	2018	15,534

	2019	15,378

	2020 and thereafter	54,021

		$	131,606

Parent_Company_Only_Tables

Parent Company Only (Tables)	12 Months Ended
	Dec. 31, 2014
Condensed Financial Information of Parent Company Only Disclosure [Abstract]
Balance Sheet	Balance Sheet


		December 31,
		2014			2013
	Assets
	Cash and cash equivalents	$	176,324		$	47,605

	Investment in subsidiaries	1,459,092			1,011,823

	Other assets	82,783			287,734

	Total assets	$	1,718,199		$	1,347,162

	Liabilities and Stockholders’ Equity
	Other liabilities	$	1,328		$	1,254

	Line of credit	—			15,000

	Subordinated notes	111,000			111,000

	Trust preferred subordinated debentures	113,406			113,406

	Total liabilities	225,734			240,660

	Preferred stock	150,000			150,000

	Common stock	457			410

	Additional paid-in capital	719,890			458,360

	Retained earnings	620,837			496,112

	Treasury stock	(8		)	(8		)
	Accumulated other comprehensive income	1,289			1,628

	Total stockholders’ equity	1,492,465			1,106,502

	Total liabilities and stockholders’ equity	$	1,718,199		$	1,347,162

Statement of Earnings	Statement of Earnings


		Year ended December 31,
		2014			2013			2012
	Loan income	$	10,850		$	10,382		$	1,484

	Dividend income	5,275			76			83

	Other income	28			72			38

	Total income	16,153			10,530			1,605

	Interest expense	10,038			9,863			4,913

	Salaries and employee benefits	617			669			668

	Legal and professional	2,237			2,605			2,094

	Other non-interest expense	933			651			744

	Total expense	13,825			13,788			8,419

	Income (loss) before income taxes and equity in undistributed income of subsidiary	2,328			(3,258		)	(6,814		)

	Income tax expense (benefit)	833			(1,165		)	(2,435		)

	Income (loss) before equity in undistributed income of subsidiary	1,495			(2,093		)	(4,379		)

	Equity in undistributed income of subsidiary	132,980			123,144			124,951

	Net income	134,475			121,051			120,572

	Preferred stock dividends	9,750			7,394			—

	Net income available to common stockholders	$	124,725		$	113,657		$	120,572

Statement of Cash Flows	Statements of Cash Flows


		Year ended December 31,
		2014			2013			2012
		(in thousands)
	Operating Activities
	Net income	$	134,475		$	121,051		$	120,572

	Adjustments to reconcile net income to net cash used in operating activities:
	Equity in undistributed income of subsidiary	(132,980		)	(123,144		)	(124,951		)
	Increase in other assets	(2,120		)	(2,413		)	(3,793		)
	Excess tax benefits from stock-based compensation arrangements	(2,929		)	(1,200		)	(7,769		)
	Increase (decrease) in other liabilities	74			37			83

	Net cash used in operating activities of continuing operations	(3,480		)	(5,669		)	(15,858		)
	Investing Activity
	Investments in and advances to subsidiaries	(100,000		)	(240,000		)	(70,000		)
	Net cash used in investing activity	(100,000		)	(240,000		)	(70,000		)
	Financing Activities
	Proceeds from sale of stock related to stock-based awards	(2,203		)	(2,210		)	355

	Proceeds from sale of common stock	256,223			—			86,987

	Proceeds from issuance of preferred stock	—			144,987			—

	Preferred dividends paid	(9,750		)	(6,960		)	—

	Issuance of subordinated notes	—			—			111,000

	Net other borrowings	(15,000		)	15,000			—

	Excess tax benefits from stock-based compensation arrangements	2,929			1,200			7,769

	Net cash provided by financing activities	232,199			152,017			206,111

	Net increase (decrease) in cash and cash equivalents	128,719			(93,652		)	120,253

	Cash and cash equivalents at beginning of year	47,605			141,257			21,004

	Cash and cash equivalents at end of year	$	176,324		$	47,605		$	141,257

Derivative_Financial_Instrumen1

Derivative Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments	The notional amounts and estimated fair values of interest rate derivative positions outstanding at December 31, 2014 and 2013 presented in the following table (in thousands):


		December 31, 2014										December 31, 2013
					Estimated Fair Value									Estimated Fair Value
		Notional			Asset Derivative			Liability Derivative				Notional		Asset Derivative			Liability Derivative
		Amount										Amount
	Non-hedging interest rate derivatives:
	Financial institution counterparties:
	Commercial loan/lease interest rate swaps	$	866,432		$	361		$	30,162			$	764,939	$	5,374		$	14,026

	Commercial loan/lease interest rate caps	63,414			$	1,014		—				58,706		664			$	—

	Customer counterparties:

	Commercial loan/lease interest rate swaps	866,432			30,162			361				764,939		14,026			5,374

	Commercial loan/lease interest rate caps	63,414			—			1,014				58,706		—			664

	Gross derivatives				31,537			31,537						20,064			20,064

	Offsetting derivative assets/liabilities				(361		)	(361		)				(5,374		)	(5,374		)
	Net derivatives included in the consolidated balance sheets				$	31,176		$	31,176					$	14,690		$	14,690

Schedule Of Weighted Average Interest Rate Received And Paid	The weighted-average receive and pay interest rates for interest rate swaps outstanding at December 31, 2014 and 2013 were as follows:


		December 31, 2014					December 31, 2013
		Weighted-Average Interest Rate					Weighted-Average Interest Rate
		Received		Paid			Received			Paid
	Non-hedging interest rate swaps	2.79	%	4.82	%		2.99	%		4.89	%

Quarterly_Financial_Data_Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2014
Selected Quarterly Financial Information [Abstract]
Schedule of Quarterly Financial Information

		2014 Selected Quarterly Financial Data
		Fourth			Third			Second			First
	Interest income	$	137,833		$	135,290		$	124,813		$	116,611

	Interest expense	10,251			9,629			9,406			8,296

	Net interest income	127,582			125,661			115,407			108,315

	Provision for credit losses	6,500			6,500			4,000			5,000

	Net interest income after provision for credit losses	121,082			119,161			111,407			103,315

	Non-interest income	11,226			10,396			10,533			10,356

	Non-interest expense	74,117			71,915			69,765			69,317

	Income before income taxes	58,191			57,642			52,175			44,354

	Income tax expense	20,357			20,810			18,754			16,089

	Net income	37,834			36,832			33,421			28,265

	Preferred stock dividends	2,437			2,438			2,437			2,438

	Net income available to common stockholders	$	35,397		$	34,394		$	30,984		$	25,827

	Basic earnings per share:	$	0.8		$	0.8		$	0.72		$	0.61

	Diluted earnings per share:	$	0.78		$	0.78		$	0.71		$	0.6

	Average shares
	Basic	44,406,000			43,144,000			43,075,000			42,298,000

	Diluted	45,093,000			43,850,000			43,845,000			43,220,000



		2013 Selected Quarterly Financial Data
		Fourth			Third			Second			First
	Interest income	$	117,965		$	115,217		$	107,264		$	104,179

	Interest expense	6,490			6,441			6,044			6,137

	Net interest income	111,475			108,776			101,220			98,042

	Provision for credit losses	5,000			5,000			7,000			2,000

	Net interest income after provision for credit losses	106,475			103,776			94,220			96,042

	Non-interest income	11,184			10,431			11,128			11,281

	Non-interest expense	70,288			62,007			68,733			55,701

	Income before income taxes	47,371			52,200			36,615			51,622

	Income tax expense	17,012			18,724			12,542			18,479

	Net income	30,359			33,476			24,073			33,143

	Preferred stock dividends	$	2,438		$	2,437		$	2,438		$	81

	Net income available to common stockholders	$	27,921		$	31,039		$	21,635		$	33,062

Basic earnings per share:	$	0.68		$	0.76		$	0.53		$	0.82

Diluted earnings per share:	$	0.67		$	0.74		$	0.52		$	0.8

Average shares
Basic	40,983,000			40,902,000			40,814,000			40,474,000

Diluted	41,889,000			41,792,000			41,724,000			41,429,000

Securities_Details

Securities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Available-for-sale securities:
Amortized Cost	$39,736	$60,709
Gross Unrealized Gains	2,134	2,780
Gross Unrealized Losses	-151	-275
Estimated Fair Value	41,719	63,214
Residential mortgage-backed securities
Available-for-sale securities:
Amortized Cost	28,957	38,786
Gross Unrealized Gains	2,108	2,676
Gross Unrealized Losses	0	0
Estimated Fair Value	31,065	41,462
Municipals
Available-for-sale securities:
Amortized Cost	3,257	14,401
Gross Unrealized Gains	10	104
Gross Unrealized Losses	0	0
Estimated Fair Value	3,267	14,505
Equity securities
Available-for-sale securities:
Amortized Cost	7,522	7,522
Gross Unrealized Gains	16	0
Gross Unrealized Losses	-151	-275
Estimated Fair Value	$7,387	$7,247

Securities_Details_1

Securities (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Amortized cost
Amortized Cost	$39,736	$60,709
Estimated fair value
Total	41,719	63,214
Available-for-sale Securities, Other Disclosure Items
Federal tax rate	35.00%	35.00%	35.00%
Securities pledged as collateral	32,718	45,993
Residential mortgage-backed securities
Amortized cost
Less Than One Year	1	238
After One Through Five Years	9,151	14,720
After Five Through Ten Years	5,661	7,718
After Ten Years	14,144	16,110
Amortized Cost	28,957	38,786
Estimated fair value
Less Than One Year	1	252
After One Through Five Years	9,662	15,641
After Five Through Ten Years	6,333	8,456
After Ten Years	15,069	17,113
Total	31,065	41,462
Weighted average yield
Less Than One Year	6.50%	4.32%
After One Through Five Years	4.79%	4.78%
After Five Through Ten Years	5.54%	5.56%
After Ten Years	2.36%	2.40%
Total	3.75%	3.94%
Available-for-sale Securities, Other Disclosure Items
Average expected life of mortgage-backed securities	1 year 2 months	1 year 5 months
Municipals
Amortized cost
Less Than One Year	1,669	7,749
After One Through Five Years	1,588	6,652
After Five Through Ten Years	0	0
After Ten Years	0	0
Amortized Cost	3,257	14,401
Estimated fair value
Less Than One Year	1,674	7,818
After One Through Five Years	1,593	6,687
After Five Through Ten Years	0	0
After Ten Years	0	0
Total	3,267	14,505
Weighted average yield
Less Than One Year	5.78%	5.76%
After One Through Five Years	5.79%	5.71%
After Five Through Ten Years	0.00%	0.00%
After Ten Years	0.00%	0.00%
Total	5.79%	5.73%
Equity securities
Amortized cost
Less Than One Year	7,522	7,522
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	0	0
Amortized Cost	7,522	7,522
Estimated fair value
Less Than One Year	7,387	7,247
After One Through Five Years	0	0
After Five Through Ten Years	0	0
After Ten Years	0	0
Total	7,387	7,247
Deposits
Available-for-sale Securities, Other Disclosure Items
Securities pledged as collateral	$10,891	$8,273

Securities_Details_2

Securities (Details 2) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value
Less Than 12 Months	$0	$7,247
12 Months or Longer	6,349	0
Total	6,349	7,247
Unrealized Loss
Less Than 12 Months	0	-275
12 Months or Longer	-151	0
Total	-151	-275
Comprehensive income	136,013	119,407	119,222
Net after-tax loss	$339	$1,644	$1,450

Loans_and_Allowance_for_Credit2

Loans and Allowance for Credit Losses (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Net Reported Amount
Commercial	$5,869,219	$5,020,565
Mortgage finance	4,102,125	2,784,265
Construction	1,416,405	1,262,905
Real estate	2,807,127	2,146,522
Consumer	19,699	15,350
Equipment leases	99,495	93,160
Gross loans held for investment	14,314,070	11,322,767
Deferred income (net of direct origination costs)	-57,058	-51,899
Allowance for loan losses	-100,954	-87,604	-74,337
Loans held for investment, net	$14,156,058	$11,183,264

Loans_and_Allowance_for_Credit3

Loans and Allowance for Credit Losses (Details 1) (USD $)	12 Months Ended
Loans and Allowance for Credit Losses (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]
Participating mortgage finance loans	$358,300,000	$33,100,000
Loan commitments rated substandard or worse that are reviewed for loss potential	500,000
Interest income recognized on non-accrual loans	1,700,000	2,400,000	2,600,000
Interest lost on non-accrual loans	2,100,000	2,500,000	2,400,000
Non-accrual loans earning on cash basis	310,000	0
Average impaired loans outstanding	46,443,000	50,794,000	66,400,000
Premium finance loans past due and still accruing	3,700,000
Loans considered restructured that are not already on nonaccrual	1,800,000	1,900,000
Nonaccrual loans that met the criteria for restructured	12,100,000	17,800,000
Decrease in post-restructuring recorded investment	15,000
Loans restructured on non-accrual	$1,500,000

Loans_and_Allowance_for_Credit4

Loans and Allowance for Credit Losses (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Commercial	$5,869,219	$5,020,565
Mortgage finance	4,102,125	2,784,265
Construction	1,416,405	1,262,905
Real estate	2,807,127	2,146,522
Consumer	19,699	15,350
Equipment leases	99,495	93,160
Total	14,314,070	11,322,767
Pass
Financing Receivable, Recorded Investment [Line Items]
Commercial	5,738,474	4,908,944
Mortgage finance	4,102,125	2,784,265
Construction	1,414,671	1,261,995
Real estate	2,785,804	2,099,744
Consumer	19,579	15,251
Equipment leases	91,044	89,317
Total	14,151,697	11,159,516
Special mention
Financing Receivable, Recorded Investment [Line Items]
Commercial	53,839	24,132
Mortgage finance	0	0
Construction	1,734	102
Real estate	8,723	6,338
Consumer	11	0
Equipment leases	4,363	51
Total	68,670	30,623
Substandard- accruing
Financing Receivable, Recorded Investment [Line Items]
Commercial	43,784	74,593
Mortgage finance	0	0
Construction	0	103
Real estate	2,653	21,770
Consumer	47	45
Equipment leases	3,915	3,742
Total	50,399	100,253
Non-accrual
Financing Receivable, Recorded Investment [Line Items]
Commercial	33,122	12,896
Mortgage finance	0	0
Construction	0	705
Real estate	9,947	18,670
Consumer	62	54
Equipment leases	173	50
Total	$43,304	$32,375

Loans_and_Allowance_for_Credit5

Loans and Allowance for Credit Losses (Details 3) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$87,604	$74,337
Provision for loan losses	19,630	18,165
Charge-offs	10,365	6,766
Recoveries	4,085	1,868
Net charge-offs (recoveries)	6,280	4,898
Ending balance	100,954	87,604
Period end amount allocated to:
Loans individually evaluated for impairment	8,376	3,174
Loans collectively evaluated for impairment	92,578	84,430
Commercial
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	39,868	21,547
Provision for loan losses	37,827	23,693
Charge-offs	9,803	6,575
Recoveries	2,762	1,203
Net charge-offs (recoveries)	7,041	5,372
Ending balance	70,654	39,868
Period end amount allocated to:
Loans individually evaluated for impairment	7,705	2,015
Loans collectively evaluated for impairment	62,949	37,853
Mortgage Finance
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	0	0
Provision for loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	0	0
Period end amount allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	0	0
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	14,553	12,097
Provision for loan losses	-6,618	2,456
Charge-offs		0
Recoveries		0
Net charge-offs (recoveries)	0	0
Ending balance	7,935	14,553
Period end amount allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	7,935	14,553
Real Estate
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	24,210	30,893
Provision for loan losses	-8,411	-6,809
Charge-offs	296	144
Recoveries	79	270
Net charge-offs (recoveries)	217	-126
Ending balance	15,582	24,210
Period end amount allocated to:
Loans individually evaluated for impairment	636	1,143
Loans collectively evaluated for impairment	14,946	23,067
Consumer
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	149	226
Provision for loan losses	195	-105
Charge-offs	266	45
Recoveries	162	73
Net charge-offs (recoveries)	104	-28
Ending balance	240	149
Period end amount allocated to:
Loans individually evaluated for impairment	9	8
Loans collectively evaluated for impairment	231	141
Equipment Leases
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	3,105	2,460
Provision for loan losses	-3,046	325
Charge-offs	0	2
Recoveries	1,082	322
Net charge-offs (recoveries)	-1,082	-320
Ending balance	1,141	3,105
Period end amount allocated to:
Loans individually evaluated for impairment	26	8
Loans collectively evaluated for impairment	1,115	3,097
Unallocated
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	5,719	7,114
Provision for loan losses	-317	-1,395
Charge-offs	0	0
Recoveries	0	0
Net charge-offs (recoveries)	0	0
Ending balance	5,402	5,719
Period end amount allocated to:
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	$5,402	$5,719

Loans_and_Allowance_for_Credit6

Loans and Allowance for Credit Losses (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	$49,280	$39,976
Loans collectively evaluated for impairment	14,264,790	11,282,791
Gross loans held for investment	14,314,070	11,322,767
Commercial
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	35,165	15,139
Loans collectively evaluated for impairment	5,834,054	5,005,426
Gross loans held for investment	5,869,219	5,020,565
Mortgage Finance
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	0	0
Loans collectively evaluated for impairment	4,102,125	2,784,265
Gross loans held for investment	4,102,125	2,784,265
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	0	705
Loans collectively evaluated for impairment	1,416,405	1,262,200
Gross loans held for investment	1,416,405	1,262,905
Real Estate
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	13,880	24,028
Loans collectively evaluated for impairment	2,793,247	2,122,494
Gross loans held for investment	2,807,127	2,146,522
Consumer
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	62	54
Loans collectively evaluated for impairment	19,637	15,296
Gross loans held for investment	19,699	15,350
Equipment Leases
Financing Receivable, Recorded Investment [Line Items]
Loans individually evaluated for impairment	173	50
Loans collectively evaluated for impairment	99,322	93,110
Gross loans held for investment	$99,495	$93,160

Loans_and_Allowance_for_Credit7

Loans and Allowance for Credit Losses (Details 5) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	$16,864	$19,676
With An Allowanced Recorded, Recorded Investment	32,416	20,300
Combined, Recorded Investment	49,280	39,976
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	19,113	21,505
With An Allowanced Recorded, Unpaid Principal Balance	33,416	21,665
Combined, Unpaid Principal Balance	52,529	43,170
Related Allowance	8,376	3,174
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	19,802	26,063
With An Allowanced Recorded, Average Recorded Investment	26,641	24,731
Combined, Average Recorded Investment	46,443	50,794	66,400
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	25	114
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	25	114
Commercial \| Business loans
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	9,608	2,005
With An Allowanced Recorded, Recorded Investment	24,553	11,060
Combined, Recorded Investment	34,161	13,065
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	11,857	2,005
With An Allowanced Recorded, Unpaid Principal Balance	25,553	12,425
Combined, Unpaid Principal Balance	37,410	14,430
Related Allowance	7,433	1,946
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	7,334	4,265
With An Allowanced Recorded, Average Recorded Investment	17,705	14,240
Combined, Average Recorded Investment	25,039	18,505
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	0	0
Commercial \| Energy loans
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	1,614
With An Allowanced Recorded, Recorded Investment	1,004	460
Combined, Recorded Investment	1,004	2,074
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	3,443
With An Allowanced Recorded, Unpaid Principal Balance	1,004	460
Combined, Unpaid Principal Balance	1,004	3,903
Related Allowance	272	69
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	375	969
With An Allowanced Recorded, Average Recorded Investment	991	913
Combined, Average Recorded Investment	1,366	1,882
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	25	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	25	0
Construction \| Market risk
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	705
With An Allowanced Recorded, Recorded Investment	0	0
Combined, Recorded Investment	0	705
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	705
With An Allowanced Recorded, Unpaid Principal Balance	0	0
Combined, Unpaid Principal Balance	0	705
Related Allowance	0	0
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	118	3,111
With An Allowanced Recorded, Average Recorded Investment	0	160
Combined, Average Recorded Investment	118	3,271
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	114
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	0	114
Real estate \| Market risk
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	3,735	13,524
With An Allowanced Recorded, Recorded Investment	4,203	6,289
Combined, Recorded Investment	7,938	19,813
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	3,735	13,524
With An Allowanced Recorded, Unpaid Principal Balance	4,203	6,289
Combined, Unpaid Principal Balance	7,938	19,813
Related Allowance	317	822
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	7,970	9,796
With An Allowanced Recorded, Average Recorded Investment	5,064	7,912
Combined, Average Recorded Investment	13,034	17,708
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	0	0
Real estate \| Commercial
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	3,521	508
With An Allowanced Recorded, Recorded Investment	526	0
Combined, Recorded Investment	4,047	508
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	3,521	508
With An Allowanced Recorded, Unpaid Principal Balance	526	0
Combined, Unpaid Principal Balance	4,047	508
Related Allowance	79	0
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	2,795	5,458
With An Allowanced Recorded, Average Recorded Investment	705	477
Combined, Average Recorded Investment	3,500	5,935
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	0	0
Real estate \| Secured by 1-4 family
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	1,320
With An Allowanced Recorded, Recorded Investment	1,895	2,387
Combined, Recorded Investment	1,895	3,707
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	1,320
With An Allowanced Recorded, Unpaid Principal Balance	1,895	2,387
Combined, Unpaid Principal Balance	1,895	3,707
Related Allowance	240	321
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	1,210	2,464
With An Allowanced Recorded, Average Recorded Investment	2,119	914
Combined, Average Recorded Investment	3,329	3,378
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	0	0
Consumer
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	0
With An Allowanced Recorded, Recorded Investment	62	54
Combined, Recorded Investment	62	54
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	0
With An Allowanced Recorded, Unpaid Principal Balance	62	54
Combined, Unpaid Principal Balance	62	54
Related Allowance	9	8
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	0	0
With An Allowanced Recorded, Average Recorded Investment	16	43
Combined, Average Recorded Investment	16	43
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	0	0
Equipment leases
Recorded Investment
With No Related Allowanced Recorded, Recorded Investment	0	0
With An Allowanced Recorded, Recorded Investment	173	50
Combined, Recorded Investment	173	50
Unpaid Principal Balance
With No Related Allowanced Recorded, Unpaid Principal Balance	0	0
With An Allowanced Recorded, Unpaid Principal Balance	173	50
Combined, Unpaid Principal Balance	173	50
Related Allowance	26	8
Average Recorded Investment
With No Related Allowanced Recorded, Average Recorded Investment	0	0
With An Allowanced Recorded, Average Recorded Investment	41	72
Combined, Average Recorded Investment	41	72
Interest Income Recognized
With No Related Allowanced Recorded, Interest Income Recognized	0	0
With An Allowanced Recorded, Interest Income Recognized	0	0
Combined, Interest Income Recognized	$0	$0

Loans_and_Allowance_for_Credit8

Loans and Allowance for Credit Losses (Details 6) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$56,826
60-89 Days Past Due	4,363
Greater Than 90 Days	5,274
Total Past Due	66,463
Non-accrual	43,304
Current	14,204,303
Total	14,314,070
Commercial \| Business loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	37,459
60-89 Days Past Due	4,355
Greater Than 90 Days	5,274
Total Past Due	47,088
Non-accrual	32,118
Current	4,680,114
Total	4,759,320
Commercial \| Energy loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	0
Non-accrual	1,004
Current	1,108,895
Total	1,109,899
Mortgage Finance
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	0
Non-accrual	0
Current	4,102,125
Total	4,102,125
Construction \| Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,571
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	3,571
Non-accrual	0
Current	1,393,513
Total	1,397,084
Construction \| Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	0
Non-accrual	0
Current	19,321
Total	19,321
Real estate \| Market risk
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	0
Non-accrual	5,134
Current	2,176,939
Total	2,182,073
Real estate \| Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	5,758
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	5,758
Non-accrual	4,047
Current	523,855
Total	533,660
Real estate \| Secured by 1-4 family
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	599
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	599
Non-accrual	766
Current	90,029
Total	91,394
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	43
60-89 Days Past Due	8
Greater Than 90 Days	0
Total Past Due	51
Non-accrual	62
Current	19,586
Total	19,699
Equipment leases
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	9,396
60-89 Days Past Due	0
Greater Than 90 Days	0
Total Past Due	9,396
Non-accrual	173
Current	89,926
Total	$99,495

Loans_and_Allowance_for_Credit9

Loans and Allowance for Credit Losses (Details 7) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
	contract	contract
Financing Receivable, Modifications [Line Items]
Number of Contracts	2	4
Pre-Restructuring Outstanding Recorded Investment	$1,536	$11,715
Post-Restructuring Outstanding Recorded Investment	1,521	9,795
Real estate
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	1
Pre-Restructuring Outstanding Recorded Investment	1,441	892
Post-Restructuring Outstanding Recorded Investment	1,441	874
Commercial
Financing Receivable, Modifications [Line Items]
Number of Contracts	1	3
Pre-Restructuring Outstanding Recorded Investment	95	10,823
Post-Restructuring Outstanding Recorded Investment	$80	$8,921

Recovered_Sheet1

Loans and Allowance for Credit Losses (Details 8) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Modifications [Line Items]
Loans modified as restructured loans	$1,521	$9,795
Extended maturity
Financing Receivable, Modifications [Line Items]
Loans modified as restructured loans	1,441	874
Adjusted payment schedule
Financing Receivable, Modifications [Line Items]
Loans modified as restructured loans	0	0
Combination of maturity extension and payment schedule adjustment
Financing Receivable, Modifications [Line Items]
Loans modified as restructured loans	$80	$8,921

OREO_and_Valuation_Allowance_f2

OREO and Valuation Allowance for Losses on OREO (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Other Real Estate [Roll Forward]
Beginning balance	$5,110	$15,991	$34,077
Additions	851	1,331	3,434
Sales	-5,393	-11,292	-14,637
Valuation allowance for OREO	0	958	-4,488
Direct write-downs	0	-1,878	-2,395
Ending balance	$568	$5,110	$15,991

Goodwill_and_Other_Intangible_2

Goodwill and Other Intangible Assets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	31-May-13
Goodwill
Gross	$15,370,000	$15,370,000
Accumulated Amortization	-374,000	-374,000
Net	14,996,000	14,996,000	954,000
Intangible assetsâ€”customer relationships and trademarks
Gross	9,104,000	9,104,000
Accumulated Amortization	-3,512,000	-2,814,000
Net	5,592,000	6,290,000
Total goodwill and intangible assets
Gross	24,474,000	24,474,000
Accumulated Amortization	-3,886,000	-3,188,000
Net	$20,588,000	$21,286,000	$2,100,000

Goodwill_and_Other_Intangible_3

Goodwill and Other Intangible Assets (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
2015	$598
2016	501
2017	474
2018	473
2019	473
Thereafter	3,073
Net	$5,592	$6,290

Goodwill_and_Other_Intangible_4

Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended			1 Months Ended
Goodwill and Other Intangible Assets (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	31-May-13
Finite-Lived Intangible Assets [Line Items]
Total intangible assets	$20,588,000	$21,286,000		$2,100,000
Amortization expense related to intangible assets	699,000	660,000	597,000
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				554,000
Useful life				14 years
Developed technology
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				457,000
Useful life				7 years
Trade name
Finite-Lived Intangible Assets [Line Items]
Intangible assets acquired				$98,000

Premises_and_Equipment_Details

Premises and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of premises and equipment
Premises and equipment, gross	$39,653	$42,978
Accumulated depreciation	-22,285	-31,496
Total premises and equipment, net	17,368	11,482
Depreciation, Depletion and Amortization
Depreciation expense	4,079	3,992	3,550
Premises
Summary of premises and equipment
Premises and equipment, gross	17,235	14,113
Furniture and equipment
Summary of premises and equipment
Premises and equipment, gross	$22,418	$28,865

Deposits_Details

Deposits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Non-interest bearing deposits
Non-interest-bearing demand deposits	$5,011,619	$3,347,567
Interest-bearing deposits
Transaction	1,292,388	792,186
Savings	5,630,253	4,414,680
Time	426,331	372,639
Deposits in foreign branches	312,709	330,307
Total interest-bearing deposits	7,661,681	5,909,812
Total deposits	$12,673,300	$9,257,379

Deposits_Details_1

Deposits (Details 1) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Scheduled maturities of interest bearing time deposits
2015	$397,192
2016	20,514
2017	4,341
2018	233
2019	4,051
2020 and after	0
Interest bearing time deposits, total	$426,331

Deposits_Details_2

Deposits (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deposits [Abstract]
Deposits from related parties	$30,171	$27,139
Interest-bearing time deposits of $250,000 or more	$527,583	$550,678

Borrowing_Arrangements_Details

Borrowing Arrangements (Details) (USD $)	12 Months Ended
Borrowing Arrangements (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Borrowings	$1,592,087,000	$1,250,036,000	$2,171,567,000
Maximum outstanding at any month end	1,592,087,000	1,859,036,000	2,432,945,000
Federal funds purchased
Debt Instrument [Line Items]
Federal funds purchased	66,971,000	148,650,000	273,179,000
Interest rate	0.30%	0.22%	0.26%
Weighted-average interest rate	0.27%	0.27%	0.28%
Average balance for the year	139,300,000	254,300,000	350,800,000
Customer repurchase agreements
Debt Instrument [Line Items]
Customer repurchase agreements	25,705,000	21,954,000	23,936,000
Interest rate	0.38%	0.31%	0.04%
Customer repurchase agreements \| Collaterized securities
Debt Instrument [Line Items]
Borrowings	21,800,000	37,700,000	23,900,000
FHLB borrowings
Debt Instrument [Line Items]
Borrowings	1,100,005,000	840,026,000	1,650,046,000
Interest rate	0.13%	0.12%	0.09%
Weighted-average interest rate	0.15%	0.14%	0.16%
Average balance for the year	213,400,000	370,000,000	1,200,000,000
Line of credit
Debt Instrument [Line Items]
Borrowings	0	15,000,000	0
Interest rate	0.00%	2.65%	0.00%
Subordinated notes
Debt Instrument [Line Items]
Borrowings	286,000,000	111,000,000	111,000,000
Interest rate	5.82%	6.50%	6.50%
Trust preferred subordinated debentures
Debt Instrument [Line Items]
Borrowings	$113,406,000	$113,406,000	$113,406,000
Interest rate	2.18%	2.17%	2.24%

Borrowing_Arrangements_Details1

Borrowing Arrangements (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Summary of other borrowing capacities
Total FHLB borrowing capacity	$3,603,529	$701,784	$300,746
Unused Federal funds lines available from commercial banks	1,186,000	890,000	706,000
Unused Federal Reserve Borrowings capacity	2,643,000	2,284,000	1,940,000
Line of credit		15,000
FHLB borrowing capacity relating to loans
Summary of other borrowing capacities
Total FHLB borrowing capacity	3,602,994	693,302	267,542
Unused Federal funds lines available from commercial banks		100,000
FHLB borrowing capacity relating to securities
Summary of other borrowing capacities
Total FHLB borrowing capacity	$535	$8,482	$33,204

Borrowing_Arrangements_Details2

Borrowing Arrangements (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Federal funds purchased and repurchase agreements	$92,676	$170,604
Within One Year	1,192,681
After One But Within Three Years	0
After Three But Within Five Years	0
After Five Years	399,406
Total	1,592,087	1,250,036	2,171,567
FHLB borrowings
Debt Instrument [Line Items]
Within One Year	1,100,005
After One But Within Three Years	0
After Three But Within Five Years	0
After Five Years	0
Total	1,100,005
Subordinated notes
Debt Instrument [Line Items]
Within One Year	0
After One But Within Three Years	0
After Three But Within Five Years	0
After Five Years	286,000
Total	286,000	111,000	111,000
Trust preferred subordinated debentures
Debt Instrument [Line Items]
Within One Year	0
After One But Within Three Years	0
After Three But Within Five Years	0
After Five Years	113,406
Total	$113,406	$113,406	$113,406

LongTerm_Debt_Details

Long-Term Debt (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2014	Sep. 21, 2012
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Total borrowings	$1,592,087	$1,250,036	$2,171,567
Trust preferred securities issued	113,406	113,406		175,000	111,000
Issuance of subordinated notes	172,375	0	111,000
Stated interest rate				5.25%	6.50%
Trust preferred subordinated debentures
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Total borrowings	$113,400

LongTerm_Debt_Details_1

Long-Term Debt (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Jan. 31, 2014	Dec. 31, 2013	Sep. 21, 2012
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Trust preferred securities issued	$113,406	$175,000	$113,406	$111,000
Texas Capital Bancshares Statutory Trust I
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Date issued	19-Nov-02
Trust preferred securities issued	10,310
Floating or fixed rate securities	Floating
Maturity date	30-Nov-32
Texas Capital Bancshares Statutory Trust I \| LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures	3 month LIBOR + 3.35%
Interest rate on subordinated debentures, spread on variable rate	3.35%
Texas Capital Statutory Trust II
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Date issued	10-Apr-03
Trust preferred securities issued	10,310
Floating or fixed rate securities	Floating
Maturity date	30-Apr-33
Texas Capital Statutory Trust II \| LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures	3Â monthÂ LIBOR + 3.25%
Interest rate on subordinated debentures, spread on variable rate	3.25%
Texas Capital Statutory Trust III
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Date issued	6-Oct-05
Trust preferred securities issued	25,774
Floating or fixed rate securities	Floating
Maturity date	31-Dec-35
Texas Capital Statutory Trust III \| LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures	3 month LIBOR + 1.51%
Interest rate on subordinated debentures, spread on variable rate	1.51%
Texas Capital Statutory Trust IV
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Date issued	28-Apr-06
Trust preferred securities issued	25,774
Floating or fixed rate securities	Floating
Maturity date	30-Jun-36
Texas Capital Statutory Trust IV \| LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures	3Â monthÂ LIBOR + 1.60%
Interest rate on subordinated debentures, spread on variable rate	1.60%
Texas Capital Statutory Trust V
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Date issued	29-Sep-06
Trust preferred securities issued	$41,238
Floating or fixed rate securities	Floating
Maturity date	31-Dec-36
Texas Capital Statutory Trust V \| LIBOR
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Interest rate on subordinated debentures	3 month LIBOR + 1.71%
Interest rate on subordinated debentures, spread on variable rate	1.71%

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
Income Taxes (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Gross deferred tax asset	$65,500,000				$60,200,000				$65,500,000	$60,200,000
Current:
Federal									77,855,000	76,478,000	69,112,000
State									2,124,000	1,878,000	1,885,000
Total									79,979,000	78,356,000	70,997,000
Deferred
Federal									-3,969,000	-11,599,000	-3,131,000
State									0	0	0
Total									-3,969,000	-11,599,000	-3,131,000
Total expense
Federal									73,886,000	64,879,000	65,981,000
State									2,124,000	1,878,000	1,885,000
Total	$20,357,000	$20,810,000	$18,754,000	$16,089,000	$17,012,000	$18,724,000	$12,542,000	$18,479,000	$76,010,000	$66,757,000	$67,866,000

Income_Taxes_Details_1

Income Taxes (Details 1) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Allowance for credit losses	$38,356	$32,752
Loan origination fees	13,651	11,580
Stock compensation	8,263	10,786
Mark to market on mortgage loans	215	220
Reserve for potential mortgage loan repurchases	20	20
Non-accrual interest	1,272	1,907
Deferred lease expense	1,688	1,316
Depreciation	691	0
OREO valuation allowance	22	499
Other	1,298	1,157
Total deferred tax assets	65,476	60,237
Deferred tax liabilities:
Loan origination costs	-1,488	-1,048
Leases	-9,466	-6,587
Depreciation	0	-2,224
Unrealized gain on securities	-694	-877
Other	-1,914	-1,819
Total deferred tax liabilities	-13,562	-12,555
Net deferred tax asset	$51,914	$47,682
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Tax at U.S. statutory rate	35.00%	35.00%	35.00%
State taxes	1.00%	1.00%	1.00%
Non-deductible expenses	1.00%	1.00%	1.00%
Non-taxable income	-1.00%	-1.00%	-1.00%
Total	36.00%	36.00%	36.00%

Employee_Benefits_Details

Employee Benefits (Details) (USD $)	12 Months Ended
Employee Benefits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer contribution	$4,500,000	$3,700,000	$2,700,000
Eligible employee contribution, minimum (in percent)	1.00%
Eligible employee contribution, maximum (in percent)	10.00%
Compensation cost for all share-based arrangements, net of taxes	3,008,000	2,677,000	3,626,000
Excess tax benefits from stock-based compensation arrangements	2,929,000	1,200,000	7,769,000
2006 ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan	400,000
Number of shares purchased under the plan	102,836	93,388	85,013
2005 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan	1,500,000
Number of shares available to be issued under the plan	44,655	43,495	26,615
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized under the plan	700,000
Number of shares available to be issued under the plan	180,120	218,820	363,020
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	4,098,000	3,551,000	4,875,000
Weighted average remaining contractual life of SARs currently outstanding (in years)	8 years 1 month 10 days
Weighted average period over which unrecognized expense expected to be recognized (in years)	3 years 6 months 0 days
Unrecognized stock-based compensation expense	10,600,000
SARs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of vested awards	11,800,000	16,000,000	10,900,000
Weighted average remaining contractual life of SARs currently outstanding (in years)	3 years 10 months 6 days	4 years 8 months 5 days	5 years 2 months 9 days
Weighted average period over which unrecognized expense expected to be recognized (in years)	3 years 2 months 13 days
Unrecognized stock-based compensation expense	1,100,000
Cash based performance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of cash-based performance units issued in period	171,808	173,035	344,127
Number of cash-based performance units outstanding	502,532
Cash-based compensation expense	9,949,000	17,287,000	6,440,000
Cash-based compensation expense, net of taxes	$6,467,000	$11,237,000	$4,186,000
Service based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of cash-based performance units outstanding	328,916
Vesting period (in years)	5 years	5 years	5 years
Service and performance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average remaining contractual life of SARs currently outstanding (in years)	8 years 1 month 0 days
Number of cash-based performance units outstanding	173,616
Minimum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years	4 years	4 years
Minimum \| Service and performance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Maximum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years	5 years	5 years
Maximum \| Service and performance
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%

Employee_Benefits_Details_1

Employee Benefits (Details 1)	12 Months Ended
Employee Benefits (Details 1)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Compensation Related Costs [Abstract]
Risk-free rate	1.46%	1.17%	0.76%
Market price volatility factor	40.20%	40.90%	40.40%
Weighted-average expected life of options	5 years	5 years	5 years

Employee_Benefits_Details_2

Employee Benefits (Details 2) (Stock Options, USD $)	12 Months Ended
Employee Benefits (Details 2) (Stock Options, USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Stock Options
Options
Options outstanding at beginning of year	54,900	174,062	569,410
Options exercised	-28,400	-119,162	-391,348
Options forfeited	-1,500	0	-4,000
Options outstanding at year-end	25,000	54,900	174,062
Weighted Average Exercise Price
Options outstanding at beginning of year, weighted average exercise price	$18.65	$13.51	$13.02
Options exercised, weighted average exercise price	$17.34	$11.14	$12.74
Options forfeited, weighted average exercise price	$14.91	$0	$19.37
Options outstanding at year-end, weighted average exercise price	$20.60	$18.65	$13.51
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]
Options vested and exercisable at year-end	25,000	54,900	174,062
Options vested and exercisable at year-end, weighted average exercise price	$20.60	$18.65	$13.51
Intrinsic value of options vested and exercisable	$843,190	$2,391,014	$5,450,620
Weighted average remaining contractual life of options vested and exercisable (in years)	3 months 18 days	11 months 19 days	1 year 1 month 24 days
Intrinsic value of options exercised	$1,193,070	$4,176,787	$10,246,387
Weighted average remaining contractual life of options currently outstanding (in years)	3 months 18 days	11 months 19 days	1 year 1 month 24 days

Employee_Benefits_Details_3

Employee Benefits (Details 3) (USD $)	12 Months Ended
Employee Benefits (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SARs / PSARs
SARs
SARs outstanding at beginning of year	537,149	640,220	983,700
SARs granted	8,000	53,500	36,000
SARs exercised	-92,640	-134,271	-345,480
SARs forfeited	-7,500	-22,300	-34,000
SARs outstanding at year-end	445,009	537,149	640,220
Weighted Average Exercise Price
SARs outstanding at beginning of year, weighted average exercise price	$23.68	$20.90	$19.56
SARs granted, weighted average exercise price	$62.02	$43.73	$44.94
SARs exercised, weighted average exercise price	$20.87	$19.21	$19.44
SARs forfeited, weighted average exercise price	$31.16	$18.99	$24.79
SARs outstanding at year end, weighted average exercise price	$24.83	$23.68	$20.90
Additional Information:
SARs vested and exercisable at year-end	355,509	384,974	446,970
SARs vested and exercisable at year end, weighted average exercise price	$21.16	$20.64	$20.41
Weighted average remaining contractual life of SARs vested	2 years 10 months 21 days	3 years 5 months 16 days	4 years 3 months
Compensation expense	$530,000	$564,000	$704,000
Weighted average fair value of SARs granted	$23.02	$16.26	$16.21
Fair value of shares vested during the year	$580,345	$566,341	$758,543
SARs
Additional Information:
Weighted average remaining contractual life of SARs currently outstanding (in years)	3 years 10 months 6 days	4 years 8 months 5 days	5 years 2 months 9 days

Employee_Benefits_Details_4

Employee Benefits (Details 4) (USD $)	12 Months Ended
Employee Benefits (Details 4) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Service based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	5 years	5 years	5 years
RSUs
Number of Shares
SARs outstanding at beginning of year	403,739	411,919	661,492
SARs granted	64,050	163,500	105,000
Vested and issued	-161,249	-151,480	-311,410
SARs forfeited	-17,375	-20,200	-43,163
SARs outstanding at year-end	289,165	403,739	411,919
Weighted- Average Grant- Date Fair Value
Balance at beginning of year, weighted average grant-date fair value	33.72	23.8	17.44
Granted, weighted average grant-date fair value	57.84	45.35	39.89
vested and issued, weighted average grant-date fair value	26.4	20.47	18.82
Forfeited, weighted average grant-date fair value	37.4	24.96	25.25
Balance at year end, weighted average grant-date fair value	42.93	33.72	23.8
Minimum \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	4 years	4 years	4 years

Financial_Instruments_with_Off2

Financial Instruments with Off-Balance Sheet Risk (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Allowance allocation for off-balance sheet commitments	$7,100,000	$4,700,000
Commitments to extend credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	5,324,460,000	3,674,391,000
Standby letters of credit
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet liability	$177,808,000	$145,662,000

Regulatory_Restrictions_Detail

Regulatory Restrictions (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]
Required reserve balance at the Federal Reserve	$88,155	$51,692
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	1,967,021	1,387,312
Total capital (to risk weighted assets) for capital adequacy purposes, amount	1,330,568	1,034,721
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	1,573,007	1,184,018
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	665,284	517,361
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	1,573,007	1,184,018
Tier 1 capital (to average assets) for capital adequacy purposes, amount	584,765	435,750
Risk Based Ratios [Abstract]
Total capital (to risk weighted assets), actual ratio	11.83%	10.73%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio	8.00%	8.00%
Tier 1 capital (to risk-weighted assets), actual ratio	9.46%	9.15%
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 capital (to average assets), actual ratio	10.76%	10.87%
Tier 1 capital (to average assets) for capital adequacy purposes, ratio	4.00%	4.00%
Bank
Total capital (to risk-weighted assets):
Total capital (to risk weighted assets), actual amount	1,757,365	1,328,227
Total capital (to risk weighted assets) for capital adequacy purposes, amount	1,330,226	1,034,406
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	1,662,782	1,293,007
Tier 1 capital (to risk-weighted assets):
Tier 1 capital (to risk-weighted assets), actual amount	1,424,351	975,933
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, amount	665,113	517,203
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, amount	997,669	775,804
Tier 1 capital (to average assets):
Tier 1 capital (to average assets), actual amount	1,424,351	975,933
Tier 1 capital (to average assets) for capital adequacy purposes, amount	584,597	435,601
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, amount	$730,746	$544,502
Risk Based Ratios [Abstract]
Total capital (to risk weighted assets), actual ratio	10.57%	10.27%
Total capital (to risk weighted assets) for capital adequacy purposes, ratio	8.00%	8.00%
Total capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	10.00%	10.00%
Tier 1 capital (to risk-weighted assets), actual ratio	8.57%	7.55%
Tier 1 capital (to risk-weighted assets) for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 capital (to risk weighted assets) to be well capitalized under prompt corrective action provisions, ratio	6.00%	6.00%
Tier 1 capital (to average assets), actual ratio	9.75%	8.96%
Tier 1 capital (to average assets) for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 capital (to average assets) to be well capitalized under prompt corrective action provisions, ratio	5.00%	5.00%

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator:
Net income	$37,834	$36,832	$33,421	$28,265	$30,359	$33,476	$24,073	$33,143	$136,352	$121,051	$120,672
Preferred stock dividends	2,437	2,438	2,437	2,438	2,438	2,437	2,438	81	9,750	7,394	0
Net income available to common stockholders	$35,397	$34,394	$30,984	$25,827	$27,921	$31,039	$21,635	$33,062	$126,602	$113,657	$120,672
Denominator:
Denominator for basic earnings per shareâ€”weighted average shares	44,406,000	43,144,000	43,075,000	42,298,000	40,983,000	40,902,000	40,814,000	40,474,000	43,236,344	40,864,225	39,046,340
Effect of employee stock-based awards									311,423	402,593	645,771
Effect of warrants to purchase common stock									455,489	513,063	473,736
Denominator for dilutive earnings per shareâ€”adjusted weighted average shares and assumed conversions	45,093,000	43,850,000	43,845,000	43,220,000	41,889,000	41,792,000	41,724,000	41,429,000	44,003,256	41,779,881	40,165,847
Basic earnings per common share	$0.80	$0.80	$0.72	$0.61	$0.68	$0.76	$0.53	$0.82	$2.93	$2.78	$3.09
Diluted earnings per common share	$0.78	$0.78	$0.71	$0.60	$0.67	$0.74	$0.52	$0.80	$2.88	$2.72	$3
Stock options excluded from computation of EPS									51,300	118,500	79,500

Fair_Value_Disclosures_Details

Fair Value Disclosures (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	$41,719	$63,214
OREO	568	5,110	15,991	34,077
Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	31,065	41,462
Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	3,267	14,505
Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	7,387	7,247
Fair value measurements, recurring basis \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Fair value measurements, recurring basis \| Level 1 \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	0	0
Fair value measurements, recurring basis \| Level 1 \| Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	0	0
Fair value measurements, recurring basis \| Level 1 \| Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	0	0
Fair value measurements, recurring basis \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	31,176	14,690
Derivative liabilities	31,176	14,690
Fair value measurements, recurring basis \| Level 2 \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	31,065	41,462
Fair value measurements, recurring basis \| Level 2 \| Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	3,267	14,505
Fair value measurements, recurring basis \| Level 2 \| Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	7,387	7,247
Fair value measurements, recurring basis \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Fair value measurements, recurring basis \| Level 3 \| Mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	0	0
Fair value measurements, recurring basis \| Level 3 \| Municipals
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	0	0
Fair value measurements, recurring basis \| Level 3 \| Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities, available-for-sale	0	0
Fair value measurements, nonrecurring basis \| Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
OREO	0	0
Fair value measurements, nonrecurring basis \| Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
OREO	0	0
Fair value measurements, nonrecurring basis \| Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	23,536	13,474
OREO	$568	$5,110

Fair_Value_Disclosures_Details1

Fair Value Disclosures (Details 1) (USD $)	12 Months Ended
Fair Value Disclosures (Details 1) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Impaired loans
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset measured on nonrecurring basis, carrying value	$29,200,000	$14,900,000
Asset measured on nonrecurring basis, specific valuation allowance	5,700,000	1,400,000
Asset measured on nonrecurring basis, reported fair value	23,500,000	13,500,000
OREO
Fair Value Assets Measured On Non Recurring Basis Unobservable Input Reconciliation [Line Items]
Asset measured on nonrecurring basis, carrying value	$568,000	$5,100,000

Fair_Value_Disclosures_Details2

Fair Value Disclosures (Details 2) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities, available-for-sale	$41,719	$63,214
Subordinated notes	286,000	111,000
Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,330,514	153,911
Securities, available-for-sale	41,719	63,214
Loans held for investment, net	14,156,058	11,183,264
Derivative assets	31,176	14,690
Deposits	12,673,300	9,257,379
Federal funds purchased	66,971	148,650
Customer repurchase agreements	25,705	21,954
Other borrowings	1,100,005	855,026
Subordinated notes	286,000	111,000
Trust preferred subordinated debentures	113,406	113,406
Derivative liabilities	31,176	14,690
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	1,330,514	153,911
Securities, available-for-sale	41,719	63,214
Loans held for investment, net	14,161,484	11,179,439
Derivative assets	31,176	14,690
Deposits	12,673,607	9,257,574
Federal funds purchased	66,971	148,650
Customer repurchase agreements	25,705	21,954
Other borrowings	1,100,005	855,026
Subordinated notes	289,947	96,647
Trust preferred subordinated debentures	113,406	113,406
Derivative liabilities	$31,176	$14,690

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Commitments and Contingencies Disclosure [Abstract]
Rent expense	$13,639	$10,216	$8,993
Minimum future lease payments under operating leases
2015	15,557
2016	15,544
2017	15,572
2018	15,534
2019	15,378
2020 and thereafter	54,021
Total	$131,606

Parent_Company_Only_Details

Parent Company Only (Details) (USD $)	Dec. 31, 2014	Jan. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 21, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified	Dec. 31, 2014	Jan. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Sep. 21, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$1,330,514		$153,911	$206,348		$110,558
Other assets	333,699		286,907
Total assets	15,899,946		11,720,064
Liabilities and Stockholdersâ€™ Equity
Line of credit			15,000
Subordinated notes	286,000		111,000
Trust preferred subordinated debentures	113,406	175,000	113,406		111,000
Total liabilities	14,415,756		10,623,714
Preferred stock	150,000		150,000
Common stock	457		410
Additional paid-in capital	709,738		448,208
Retained earnings	622,714		496,112
Treasury stock	-8		-8
Accumulated other comprehensive income	1,289		1,628
Total stockholdersâ€™ equity	1,484,190		1,096,350	836,242		616,331
Total liabilities and stockholdersâ€™ equity	15,899,946		11,720,064
Texas Capital Bancshares, Inc.
Assets
Cash and cash equivalents	176,324		47,605	141,257		21,004
Investment in subsidiaries	1,459,092		1,011,823
Other assets	82,783		287,734
Total assets	1,718,199		1,347,162
Liabilities and Stockholdersâ€™ Equity
Other liabilities	1,328		1,254
Line of credit	0		15,000
Subordinated notes	111,000		111,000
Trust preferred subordinated debentures	113,406		113,406
Total liabilities	225,734		240,660
Preferred stock	150,000		150,000
Common stock	457		410
Additional paid-in capital	719,890		458,360
Retained earnings	620,837		496,112
Treasury stock	-8		-8
Accumulated other comprehensive income	1,289		1,628
Total stockholdersâ€™ equity	1,492,465		1,106,502
Total liabilities and stockholdersâ€™ equity	$1,718,199		$1,347,162

Parent_Company_Only_Details_1

Parent Company Only (Details 1) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Earnings
Loan income									$511,606	$441,314	$393,548
Interest expense	10,251	9,629	9,406	8,296	6,490	6,441	6,044	6,137	37,582	25,112	21,578
Salaries and employee benefits									169,051	157,752	121,456
Legal and professional									21,182	18,104	17,557
Other non-interest expense									28,355	24,242	26,766
Income tax expense	20,357	20,810	18,754	16,089	17,012	18,724	12,542	18,479	76,010	66,757	67,866
Net income	37,834	36,832	33,421	28,265	30,359	33,476	24,073	33,143	136,352	121,051	120,672
Preferred stock dividends	2,437	2,438	2,437	2,438	2,438	2,437	2,438	81	9,750	7,394	0
Net income available to common stockholders	35,397	34,394	30,984	25,827	27,921	31,039	21,635	33,062	126,602	113,657	120,672
Texas Capital Bancshares, Inc.
Statement of Earnings
Loan income									10,850	10,382	1,484
Dividend income									5,275	76	83
Other income									28	72	38
Total income									16,153	10,530	1,605
Interest expense									10,038	9,863	4,913
Salaries and employee benefits									617	669	668
Legal and professional									2,237	2,605	2,094
Other non-interest expense									933	651	744
Total expense									13,825	13,788	8,419
Income (loss) before income taxes and equity in undistributed income of subsidiary									2,328	-3,258	-6,814
Income tax expense									833	-1,165	-2,435
Income before income taxes									1,495	-2,093	-4,379
Equity in undistributed income of subsidiary									132,980	123,144	124,951
Net income									134,475	121,051	120,572
Preferred stock dividends									9,750	7,394	0
Net income available to common stockholders									$124,725	$113,657	$120,572

Parent_Company_Only_Details_2

Parent Company Only (Details 2) (USD $)	0 Months Ended	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Mar. 28, 2013	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income		$37,834	$36,832	$33,421	$28,265	$30,359	$33,476	$24,073	$33,143	$136,352	$121,051	$120,672
Adjustments to reconcile net income to net cash used in operating activities:
Increase in other assets										-58,579	31,010	-61,243
Excess tax benefits from stock-based compensation arrangements										-2,929	-1,200	-7,769
Increase (decrease) in other liabilities										32,599	3,508	10,835
Net cash provided by operating activities										151,960	191,377	89,272
Investing Activity
Net cash used in investing activities										-2,977,903	-1,275,875	-2,263,185
Financing Activities
Proceeds (costs) from issuance of stock related to stock-based awards and warrants										-2,203	-2,210	355
Proceeds from sale of common stock										256,223	0	86,987
Proceeds from issuance of preferred stock	145,000									0	144,987	0
Preferred dividends paid										-9,750	-6,960	0
Issuance of subordinated notes										172,375	0	111,000
Net other borrowings										244,979	-797,002	318,115
Excess tax benefits from stock-based compensation arrangements										2,929	1,200	7,769
Net cash provided by financing activities										4,002,546	1,032,061	2,269,703
Net increase (decrease) in cash and cash equivalents										1,176,603	-52,437	95,790
Cash and cash equivalents at beginning of period					153,911				206,348	153,911	206,348	110,558
Cash and cash equivalents at end of period		1,330,514				153,911				1,330,514	153,911	206,348
Texas Capital Bancshares, Inc.
Operating activities
Net income										134,475	121,051	120,572
Adjustments to reconcile net income to net cash used in operating activities:
Equity in undistributed income of subsidiary										-132,980	-123,144	-124,951
Increase in other assets										-2,120	-2,413	-3,793
Excess tax benefits from stock-based compensation arrangements										-2,929	-1,200	-7,769
Increase (decrease) in other liabilities										74	37	83
Net cash provided by operating activities										-3,480	-5,669	-15,858
Investing Activity
Investments in and advances to subsidiaries										-100,000	-240,000	-70,000
Net cash used in investing activities										-100,000	-240,000	-70,000
Financing Activities
Proceeds (costs) from issuance of stock related to stock-based awards and warrants										-2,203	-2,210	355
Proceeds from sale of common stock										256,223	0	86,987
Proceeds from issuance of preferred stock										0	144,987	0
Preferred dividends paid										-9,750	-6,960	0
Issuance of subordinated notes										0	0	111,000
Net other borrowings										-15,000	15,000	0
Excess tax benefits from stock-based compensation arrangements										2,929	1,200	7,769
Net cash provided by financing activities										232,199	152,017	206,111
Net increase (decrease) in cash and cash equivalents										128,719	-93,652	120,253
Cash and cash equivalents at beginning of period					47,605				141,257	47,605	141,257	21,004
Cash and cash equivalents at end of period		$176,324				$47,605				$176,324	$47,605	$141,257

Derivative_Financial_Instrumen2

Derivative Financial Instruments (Details 1) (Non-hedging, USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Estimated fair value, asset derivative	$31,537	$20,064
Estimated fair value, liability derivative	31,537	20,064
Offsetting derivative liabilities	-361	-5,374
Offsetting derivative assets	-361	-5,374
Net asset derivatives included in the consolidated balance sheets	31,176	14,690
Net liability derivatives included in the consolidated balance sheets	31,176	14,690
Financial institution counterparties \| Commercial loan/lease \| Interest rate swap
Derivative [Line Items]
Notional amount	866,432	764,939
Estimated fair value, asset derivative	361	5,374
Estimated fair value, liability derivative	30,162	14,026
Financial institution counterparties \| Commercial loan/lease \| Interest rate cap
Derivative [Line Items]
Notional amount	63,414	58,706
Estimated fair value, asset derivative	1,014	664
Estimated fair value, liability derivative	0	0
Customer counterparties \| Commercial loan/lease \| Interest rate swap
Derivative [Line Items]
Notional amount	866,432	764,939
Estimated fair value, asset derivative	30,162	14,026
Estimated fair value, liability derivative	361	5,374
Customer counterparties \| Commercial loan/lease \| Interest rate cap
Derivative [Line Items]
Notional amount	63,414	58,706
Estimated fair value, asset derivative	0	0
Estimated fair value, liability derivative	$1,014	$664

Derivative_Financial_Instrumen3

Derivative Financial Instruments Derivative Financial Instruments (Details 2) (Non-hedging, Commercial loan/lease, Interest rate swap)	Dec. 31, 2014	Dec. 31, 2013
Interest rate received
Derivative [Line Items]
Weighted average fixed interest rate	2.79%	2.99%
Interest rate paid
Derivative [Line Items]
Weighted average fixed interest rate	4.82%	4.89%

Derivative_Financial_Instrumen4

Derivative Financial Instruments Derivative Financial Instruments (Details 3) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Cash collateral pledged for derivatives	$30.20	$10.70
Non-hedging \| Commercial loan/lease
Derivative [Line Items]
Credit risk exposure, net of collateral pledged, relating to derivatives	$31.20	$14.70
Non-hedging \| Interest rate cap \| Commercial loan/lease
Derivative [Line Items]
Weighted average fixed interest rate	1.44%	1.87%

Stockholders_Equity_Details

Stockholder's Equity (Details) (USD $)	0 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended		0 Months Ended
Stockholder's Equity (Details) (USD $)	Mar. 28, 2013	Jan. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 28, 2013	Jan. 31, 2009	Nov. 12, 2014
Equity Distribution Agreement [Line Items]
Net proceeds from issuance of stock			$256,223,000		$86,987,000
Number of warrants outstanding			581,500
Warrants, price per share			$14.84
Dividend rate percentage of preferred stock	6.50%
Par value of preferred stock	$0.01		$0.01	$0.01		0.01
Liquidation preference per share	$25					25
Payments of dividends on preferred stock			9,750,000	6,960,000	0
Net proceeds from issuance of preferred stock	145,000,000		0	144,987,000	0
Repayments of short-term debt		15,000,000
Preferred Stock
Equity Distribution Agreement [Line Items]
Net proceeds from issuance of stock							75,000,000
Issuance of stock - shares						6,000,000
Common Stock
Equity Distribution Agreement [Line Items]
Net proceeds from issuance of stock		$106,500,000	$44,000		$23,000			$149,600,000
Issuance of stock - shares		1,900,000	4,398,128		2,300,000			2,500,000

Quarterly_Financial_Data_Detai

Quarterly Financial Data (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Selected Quarterly Financial Information [Abstract]
Interest income	$137,833	$135,290	$124,813	$116,611	$117,965	$115,217	$107,264	$104,179	$514,547	$444,625	$398,457
Interest expense	10,251	9,629	9,406	8,296	6,490	6,441	6,044	6,137	37,582	25,112	21,578
Net interest income	127,582	125,661	115,407	108,315	111,475	108,776	101,220	98,042	476,965	419,513	376,879
Provision for credit losses	6,500	6,500	4,000	5,000	5,000	5,000	7,000	2,000	22,000	19,000	11,500
Net interest income after provision for credit losses	121,082	119,161	111,407	103,315	106,475	103,776	94,220	96,042	454,965	400,513	365,379
Non-interest income	11,226	10,396	10,533	10,356	11,184	10,431	11,128	11,281	42,511	44,024	43,040
Non-interest expense	74,117	71,915	69,765	69,317	70,288	62,007	68,733	55,701	285,114	256,729	219,881
Income before income taxes	58,191	57,642	52,175	44,354	47,371	52,200	36,615	51,622	212,362	187,808	188,538
Income tax expense	20,357	20,810	18,754	16,089	17,012	18,724	12,542	18,479	76,010	66,757	67,866
Net income	37,834	36,832	33,421	28,265	30,359	33,476	24,073	33,143	136,352	121,051	120,672
Preferred stock dividends	2,437	2,438	2,437	2,438	2,438	2,437	2,438	81	9,750	7,394	0
Net income available to common stockholders	$35,397	$34,394	$30,984	$25,827	$27,921	$31,039	$21,635	$33,062	$126,602	$113,657	$120,672
Basic earnings per share:
Basic earnings per common share	$0.80	$0.80	$0.72	$0.61	$0.68	$0.76	$0.53	$0.82	$2.93	$2.78	$3.09
Diluted earnings per share:
Diluted earnings per common share	$0.78	$0.78	$0.71	$0.60	$0.67	$0.74	$0.52	$0.80	$2.88	$2.72	$3
Average shares
Basic	44,406,000	43,144,000	43,075,000	42,298,000	40,983,000	40,902,000	40,814,000	40,474,000	43,236,344	40,864,225	39,046,340
Diluted	45,093,000	43,850,000	43,845,000	43,220,000	41,889,000	41,792,000	41,724,000	41,429,000	44,003,256	41,779,881	40,165,847