Bank OZK 10-Q 7 Nov 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014
Document And Entity Information [Abstract]	'
Document Type	'10-Q
Amendment Flag	'false
Document Period End Date	30-Sep-14
Document Fiscal Year Focus	'2014
Document Fiscal Period Focus	'Q3
Trading Symbol	'OZRK
Entity Registrant Name	'BANK OF THE OZARKS INC
Entity Central Index Key	'0001038205
Current Fiscal Year End Date	'--12-31
Entity Filer Category	'Large Accelerated Filer
Entity Common Stock, Shares Outstanding	79,704,950

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
ASSETS	'	'	'
Cash and due from banks	$109,877	$195,094	$123,291
Interest earning deposits	2,207	881	1,167
Cash and cash equivalents	112,084	195,975	124,458
Investment securities - available for sale ("AFS")	859,876	669,384	671,393
Non-purchased loans and leases	3,639,142	2,632,565	2,522,589
Purchased loans not covered by Federal Deposit Insurance Corporation ("FDIC") loss share agreements ("purchased non-covered loans")	1,030,988	372,723	399,058
Loans covered by FDIC loss share agreements ("covered loans")	248,802	351,791	409,319
Allowance for loan and lease losses	-49,606	-42,945	-41,660
Net loans and leases	4,869,326	3,314,134	3,289,306
FDIC loss share receivable	36,583	71,854	89,642
Premises and equipment, net	267,888	245,472	245,055
Foreclosed assets not covered by FDIC loss share agreements	14,781	11,851	11,647
Foreclosed assets covered by FDIC loss share agreements	27,882	37,960	40,452
Accrued interest receivable	20,966	14,359	15,227
Bank owned life insurance ("BOLI")	180,667	143,473	142,311
Intangible assets, net	107,108	19,158	20,039
Other, net	83,199	67,550	61,037
Total assets	6,580,360	4,791,170	4,710,567
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'	'
Demand non-interest bearing	1,089,415	746,320	724,413
Savings and interest bearing transaction	2,787,958	2,073,497	1,952,617
Time	1,262,332	897,210	977,656
Total deposits	5,139,705	3,717,027	3,654,686
Repurchase agreements with customers	73,942	53,103	50,254
Other borrowings	352,616	280,895	280,905
Subordinated debentures	64,950	64,950	64,950
FDIC clawback payable	26,676	25,897	25,705
Accrued interest payable and other liabilities	43,452	16,768	18,251
Total liabilities	5,701,341	4,158,640	4,094,751
Commitments and contingencies	'	'	'
Stockholders' equity:	'	'	'
Preferred stock; $0.01 par value; 1,000,000 shares authorized; no shares outstanding at September 30, 2014 and 2013 or at December 31, 2013	0	0	0
Common stock; $0.01 par value; 125,000,000 shares authorized; 79,704,950, 73,403,418 and 73,711,704 shares issued and outstanding at September 30, 2014, September 30, 2013 and December 31, 2013, respectively	797	737	735
Additional paid-in capital	317,390	143,017	139,768
Retained earnings	546,667	488,978	472,288
Accumulated other comprehensive income (loss)	10,724	-3,672	-453
Total stockholders' equity before noncontrolling interest	875,578	629,060	612,338
Noncontrolling interest	3,441	3,470	3,478
Total stockholders' equity	879,019	632,530	615,816
Total liabilities and stockholders' equity	$6,580,360	$4,791,170	$4,710,567

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Statement of Financial Position [Abstract]	'	'	'
Preferred stock, par value	$0.01	$0.01	$0.01
Preferred stock, shares authorized	1,000,000	1,000,000	1,000,000
Preferred stock, shares outstanding	0	0	0
Common stock, par value	$0.01	$0.01	$0.01
Common stock, shares authorized	125,000,000	125,000,000	125,000,000
Common stock, shares issued	79,704,950	73,711,704	73,403,418
Common stock, shares outstanding	79,704,950	73,711,704	73,403,418

Consolidated_Statements_of_Inc

Consolidated Statements of Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Interest income:	'	'	'	'
Non-purchased loans and leases	$43,153	$33,183	$113,400	$93,782
Purchased non-covered loans	18,056	5,653	39,534	7,366
Covered loans	10,630	10,501	31,166	34,845
Investment securities:	'	'	'	'
Taxable	2,986	1,988	8,135	4,456
Tax-exempt	5,247	4,006	14,617	11,599
Deposits with banks and federal funds sold	11	11	50	21
Total interest income	80,083	55,342	206,902	152,069
Interest expense:	'	'	'	'
Deposits	2,285	1,537	5,693	4,457
Repurchase agreements with customers	15	7	40	21
Other borrowings	2,736	2,732	8,083	8,064
Subordinated debentures	426	433	1,267	1,290
Total interest expense	5,462	4,709	15,083	13,832
Net interest income	74,621	50,633	191,819	138,237
Provision for loan and lease losses	-3,687	-3,818	-10,574	-9,212
Net interest income after provision for loan and lease losses	70,934	46,815	181,245	129,025
Non-interest income:	'	'	'	'
Service charges on deposit accounts	7,356	5,817	19,601	15,613
Mortgage lending income	1,728	1,276	3,807	4,660
Trust income	1,419	1,060	4,099	2,808
BOLI income	1,390	1,179	3,799	3,365
Accretion (amortization) of FDIC loss share receivable, net of amortization of FDIC clawback payable	-562	1,396	-611	6,269
Other income from loss share and purchased non-covered loans, net	3,369	2,484	10,309	8,328
Net gains on investment securities	43	0	67	156
Gains on sales of other assets	1,688	2,501	4,111	7,586
Gain on merger and acquisition transactions	0	5,163	4,667	5,163
Other	2,817	1,226	7,147	3,498
Total non-interest income	19,248	22,102	56,996	57,446
Non-interest expense:	'	'	'	'
Salaries and employee benefits	20,876	16,456	57,396	47,445
Net occupancy and equipment	6,823	4,786	17,574	13,670
Other operating expenses	14,824	10,966	42,886	30,226
Total non-interest expense	42,523	32,208	117,856	91,341
Income before taxes	47,659	36,709	120,385	95,130
Provision for income taxes	15,579	10,224	36,559	28,255
Net income	32,080	26,485	83,826	66,875
Earnings attributable to noncontrolling interest	13	-33	29	-36
Net income available to common stock	$32,093	$26,452	$83,855	$66,839
Basic earnings per common share	$0.40	$0.36	$1.09	$0.94
Diluted earnings per common share	$0.40	$0.36	$1.08	$0.93
Dividends declared per common share	$0.12	$0.10	$0.35	$0.26

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (Unaudited) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Net income	$32,080	$26,485	$83,826	$66,875
Other comprehensive income (loss):	'	'	'	'
Unrealized gains and losses on investment securities AFS	1,223	732	23,754	-18,333
Tax effect of unrealized gains and losses on investment securities AFS	-479	-287	-9,317	7,191
Reclassification of gains and losses on investment securities AFS included in net income	-43	0	-67	-156
Tax effect of reclassification of gains and losses on investment securities AFS included in net income	17	0	26	62
Total other comprehensive income (loss)	718	445	14,396	-11,236
Total comprehensive income	$32,798	$26,930	$98,222	$55,639

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholder's Equity (Unaudited) (USD $)

Total

Common Stock [Member]

Additional Paid-In Capital [Member]

Retained Earnings [Member]

Accumulated Other Comprehensive Income Loss [Member]

Non-Controlling Interest [Member]

First National Bank [Member]

First National Bank [Member]

First National Bank [Member]

First National Bank [Member]

First National Bank [Member]

First National Bank [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

In Thousands

Common Stock [Member]

Additional Paid-In Capital [Member]

Retained Earnings [Member]

Accumulated Other Comprehensive Income Loss [Member]

Non-Controlling Interest [Member]

Common Stock [Member]

Additional Paid-In Capital [Member]

Retained Earnings [Member]

Accumulated Other Comprehensive Income Loss [Member]

Non-Controlling Interest [Member]

Balances at Dec. 31, 2012

$511,106

$706

$72,690

$423,485

$10,783

$3,442

'

'

'

'

'

'

'

'

'

'

'

'

Net income

66,875

0

0

66,875

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Earnings attributable to noncontrolling interest

0

0

0

-36

0

36

'

'

'

'

'

'

'

'

'

'

'

'

Total other comprehensive income (loss)

-11,236

0

0

0

-11,236

0

'

'

'

'

'

'

'

'

'

'

'

'

Common stock dividends

-18,036

0

0

-18,036

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of split-adjusted shares of common stock for exercise of stock options

2,617

4

2,613

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Excess tax benefit on exercise and forfeiture of stock options

1,458

0

1,458

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation expense

3,238

0

3,238

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of split-adjusted common stock for acquisition

'

'

'

'

'

'

59,794

25

59,769

0

0

0

'

'

'

'

'

'

Balances at Sep. 30, 2013

615,816

735

139,768

472,288

-453

3,478

'

'

'

'

'

'

'

'

'

'

'

'

Balances at Dec. 31, 2013

632,530

737

143,017

488,978

-3,672

3,470

'

'

'

'

'

'

'

'

'

'

'

'

Net income

83,826

0

0

83,826

0

0

'

'

'

'

'

'

7,400

'

'

'

'

'

Earnings attributable to noncontrolling interest

0

0

0

29

0

-29

'

'

'

'

'

'

'

'

'

'

'

'

Total other comprehensive income (loss)

14,396

0

0

0

14,396

0

'

'

'

'

'

'

'

'

'

'

'

'

Common stock dividends

-26,166

0

0

-26,166

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of split-adjusted shares of common stock for exercise of stock options

2,067

2

2,065

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Forfeiture of split-adjusted shares of unvested common stock under restricted stock plan

0

0

0

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Excess tax benefit on exercise and forfeiture of stock options

1,649

0

1,649

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Stock-based compensation expense

4,402

0

4,402

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of split-adjusted common stock for acquisition

'

'

'

'

'

'

'

'

'

'

'

'

166,315

58

166,257

0

0

0

Balances at Sep. 30, 2014

$879,019

$797

$317,390

$546,667

$10,724

$3,441

'

'

'

'

'

'

'

'

'

'

'

'

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholder's Equity (Unaudited) (Parenthetical) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Issuance of split-adjusted common stock for exercise of stock options, shares	228,600	356,800
Forfeiture of unvested common stock under restricted stock plan, shares	1,200	'
First National Bank [Member]	'	'
Issuance of split-adjusted common stock for acquisition, shares	'	2,514,770
Common stock issuance cost	'	285,000
Summit Bancorp, Inc. [Member]	'	'
Issuance of split-adjusted common stock for acquisition, shares	5,765,846	'
Common stock issuance cost	87,000	'

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (Unaudited) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net income	$83,826	$66,875
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation	5,968	5,317
Amortization	3,464	1,924
Earnings attributable to noncontrolling interest	29	-36
Provision for loan and lease losses	10,574	9,212
Provision for losses on foreclosed assets	862	1,072
Net amortization of investment securities AFS	431	450
Net gains on investment securities AFS	-67	-156
Originations of mortgage loans held for sale	-152,767	-172,210
Proceeds from sales of mortgage loans held for sale	154,409	191,570
Accretion of covered loans	-31,166	-34,845
Accretion of purchased non-covered loans	-39,534	-7,366
(Accretion)/amortization of FDIC loss share receivable, net of amortization of FDIC clawback payable	611	-6,269
Gains on sales of other assets	-4,111	-7,586
Gain on merger and acquisition transactions	-4,667	-5,163
Deferred income tax benefit	-6,625	-2,070
Increase in cash surrender value of BOLI	-3,799	-3,365
Excess tax benefit on exercise and forfeiture of stock options	-1,649	-1,458
Stock-based compensation expense	4,402	3,238
Changes in assets and liabilities:	'	'
Accrued interest receivable	-1,872	-900
Other assets, net	5,496	2,473
Accrued interest payable and other liabilities	24,396	2,137
Net cash provided by operating activities	48,211	42,844
Cash flows from investing activities:	'	'
Proceeds from sales of investment securities AFS	54,957	999
Proceeds from maturities/calls/paydowns of investment securities AFS	68,349	71,860
Purchases of investment securities AFS	-46,618	-124,193
Net advances on non-purchased loans and leases	-1,017,513	-428,273
Payments received on purchased non-covered loans	253,347	37,666
Payments received on covered loans	97,915	177,094
Payments received from FDIC under loss share agreements	24,810	66,993
Other net decreases in covered assets and FDIC loss share receivable	15,267	21,634
Purchases of premises and equipment	-10,352	-7,815
Proceeds from sales of other assets	54,350	47,975
Cash received from (invested) in unconsolidated investments	1,320	-571
Net cash received in merger and acquisition transactions	121,918	56,786
Net cash used by investing activities	-382,250	-79,845
Cash flows from financing activities:	'	'
Net increase (decrease) in deposits	196,998	-46,987
Net proceeds from other borrowings	71,276	142
Net increase in repurchase agreements with customers	4,324	14,298
Proceeds from exercise of stock options	2,067	2,617
Excess tax benefit on exercise and forfeiture of stock options	1,649	1,458
Cash dividends paid on common stock	-26,166	-18,036
Net cash provided (used) by financing activities	250,148	-46,508
Net decrease in cash and cash equivalents	-83,891	-83,509
Cash and cash equivalents - beginning of period	195,975	207,967
Cash and cash equivalents - end of period	$112,084	$124,458

Organization_and_Principles_of

Organization and Principles of Consolidation	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Organization and Principles of Consolidation	'
	1	Organization and Principles of Consolidation
	Bank of the Ozarks, Inc. (the “Company”) is a bank holding company headquartered in Little Rock, Arkansas, which operates under the rules and regulations of the Board of Governors of the Federal Reserve System. The Company owns a wholly-owned state chartered bank subsidiary – Bank of the Ozarks (the “Bank”), four 100%-owned finance subsidiary business trusts – Ozark Capital Statutory Trust II (“Ozark II”), Ozark Capital Statutory Trust III (“Ozark III”), Ozark Capital Statutory Trust IV (“Ozark IV”) and Ozark Capital Statutory Trust V (“Ozark V”) (collectively, the “Trusts”) and, indirectly through the Bank, a subsidiary engaged in the development of real estate, a subsidiary that owns private aircraft and various other entities that hold foreclosed assets or tax credits or engage in other activities. The Company and Bank are subject to the regulation of certain federal and state agencies and undergo periodic examinations by those regulatory authorities. The consolidated financial statements include the accounts of the Company, the Bank, the real estate subsidiary, the aircraft subsidiary and certain of those various other entities in accordance with accounting principles generally accepted in the United States (“GAAP”). Significant intercompany transactions and amounts have been eliminated in consolidation.
	At September 30, 2014, the Company had 165 offices, including 88 in Arkansas, 28 in Georgia, 21 in Texas, 17 in North Carolina, five in Florida, three in Alabama, and one office each in South Carolina, New York and California.

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Basis of Presentation	'
	2	Basis of Presentation
	The accompanying consolidated financial statements have been prepared by the Company, without audit, pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) in Article 10 of Regulation S-X and in accordance with the instructions to Form 10-Q and GAAP for interim financial information. Certain information, accounting policies and footnote disclosures normally included in complete financial statements prepared in accordance with GAAP have been condensed or omitted in accordance with such rules and regulations. These consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. Actual results could differ from those estimates. In the opinion of management, all adjustments considered necessary, consisting of normal recurring items, have been included for a fair presentation of the accompanying consolidated financial statements. Operating results for the nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for the full year or future periods.
	On June 23, 2014, the Company completed a two-for-one stock split in the form of a stock dividend, effected by issuing one share of common stock for each share of such stock outstanding on June 13, 2014. All share and per share information in the consolidated financial statements and the notes to the consolidated financial statements has been adjusted to give effect to this stock split.
	Certain reclassifications of prior period amounts have been made to conform with the current period presentation. These reclassifications had no impact on previously reported net income. Additionally, as provided for under GAAP, management has up to 12 months following the date of a business combination transaction to finalize the fair values of acquired assets and assumed liabilities. Once management has finalized the fair values of acquired assets and assumed liabilities within this 12-month period, management considers such values to be the day 1 fair values (“Day 1 Fair Values”). During the second quarter of 2014, the Company revised its initial estimates regarding the expected recovery of acquired assets with built-in losses in its July 31, 2013 acquisition of The First National Bank of Shelby (“First National Bank”). As a result, certain amounts previously reported in the Company’s financial statements have been recast.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Acquisitions	'
	3	Acquisitions
	On July 31, 2014, the Company entered into a definitive agreement and plan of merger (the “Intervest Agreement”) with Intervest Bancshares Corporation (“Intervest”), and its wholly-owned bank subsidiary Intervest National Bank (“INB”), headquartered in New York, New York, whereby the Company will acquire all of the outstanding common stock of Intervest in a transaction valued at approximately $228.5 million. INB operates seven full service banking offices including one in New York City, five in Clearwater, Florida and one in Pasadena, Florida. At September 30, 2014, INB reported approximately $1.51 billion in total assets, approximately $1.18 billion in loans, approximately $0.31 million in investment securities and approximately $1.21 billion in deposits.
	Under the terms of the Intervest Agreement, each outstanding share of common stock of Intervest will be converted into the right to receive shares of the Company’s common stock, plus cash in lieu of any fractional share, all subject to certain conditions and potential adjustments. The number of Company shares to be issued will be determined based on the Company’s 10-day average closing stock price as of the fifth business day prior to the closing date, subject to a minimum price of $23.95 per share and a maximum price of $39.91 per share. Upon the closing of the transaction, Intervest will merge into the Company and INB will merge into the Bank. Completion of the transaction is subject to certain closing conditions, including receipt of customary regulatory approvals and the approval of Intervest’s stockholders.
	Summit Bancorp, Inc.
	On May 16, 2014, the Company completed its acquisition of Summit Bancorp, Inc. (“Summit”) and Summit Bank, its wholly-owned bank subsidiary, for an aggregate of $42.5 million in cash and 5,765,846 split-adjusted shares of its common stock. The acquisition of Summit expanded the Company’s service area in Central, South and Western Arkansas by adding 23 banking locations and one loan production office in nine Arkansas counties. During the second quarter of 2014, the Company closed one of the banking offices and the one loan production office acquired in the Summit acquisition.
	The following table provides a summary of the assets acquired and liabilities assumed as recorded by Summit, the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value, and the resultant fair values of those assets and liabilities as recorded by the Company. As provided for under GAAP, management has up to 12 months following the date of acquisition to finalize the fair values of the acquired assets and assumed liabilities. The fair value adjustments and the resultant fair values shown in the following table continue to be evaluated by management and may be subject to further adjustment.
			May 16, 2014
			As Recorded by			Fair Value					As Recorded
			Summit			Adjustments					by the
											Company
			(Dollars in thousands)
	Assets acquired:
	Cash, due from banks and interest earning deposits		$	84,106		$	(304	)		a	$	83,802
	Investment securities			242,149			765			b		242,914
	Loans and leases			742,546			(24,718	)		c		717,828
	Allowance for loan losses			(13,183	)		13,183			c		0
	Premises and equipment			13,773			(1,108	)		d		12,665
	Foreclosed assets			3,094			(1,088	)		e		2,006
	Accrued interest receivable and other assets			11,016			1,461			f		12,477
	Bank owned life insurance			33,398			0					33,398
	Core deposit intangible asset			0			15,340			g		15,340
	Deferred income taxes			3,878			953			h		4,831
	Total assets acquired			1,120,777			4,484					1,125,261
	Liabilities assumed:
	Deposits			965,687			4,074			i		969,761
	Repurchase agreements with customers			16,515			0					16,515
	Accrued interest payable and other liabilities			2,352			1,206			j		3,558
	Total liabilities assumed			984,554			5,280					989,834
	Net assets acquired		$	136,223		$	(796	)				135,427
	Consideration paid:
	Cash											42,451
	Stock											166,402
	Total consideration paid											208,853
	Goodwill										$	73,426
	Explanation of fair value adjustments
	a-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of acquired interest earning deposits.
	b-		Adjustment reflects the fair value adjustment based on the Company’s pricing of the acquired investment securities portfolio.
	c-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired loan portfolio and to eliminate the recorded allowance for loan losses.
	d-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the premises and equipment acquired.
	e-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired foreclosed assets.
	f-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of accrued interest receivable and other assets.
	g-		Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.
	h-		This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes.
	i-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired deposits.
	j-		Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of Summit.
	Goodwill of $73.4 million, which is the excess of the merger consideration over the fair value of net assets acquired, was recorded in the Summit acquisition and is the result of expected operational synergies and other factors. This goodwill is not expected to be deductible for tax purposes.
	The Company’s consolidated results of operations include the operating results for Summit beginning May 16, 2014 through the end of the reporting period. Summit’s operating results contributed $10.9 million of net interest income and $5.0 million of net income to the Company’s results of operations for the three months ended September 30, 2014, and contributed $16.6 million of net interest income and $7.4 million of net income to the Company’s results of operations for the nine months ended September 30, 2014.
	The following unaudited supplemental pro forma information is presented to show the estimated results assuming Summit was acquired as of the beginning of each period presented, adjusted for estimated potential costs savings. These unaudited pro forma results are not necessarily indicative of the operating results that the Company would have achieved had it completed the acquisition as of January 1, 2013 or 2014 and should not be considered as representative of future operating results.
			Nine Months Ended
			September 30,
			2014			2013
			(Dollars in thousands,
			except per share amounts)
	Net interest income – pro forma (unaudited)		$	208,758		$	171,824
	Net income – pro forma (unaudited)		$	91,402		$	81,787
	Diluted earnings per common share – pro forma (unaudited)		$	1.14		$	1.05
	Bancshares, Inc.
	On March 5, 2014, the Company completed its acquisition of Bancshares, Inc. (“Bancshares”) of Houston, Texas and OMNIBANK, N.A., its wholly-owned bank subsidiary for an aggregate of $21.5 million in cash. The acquisition of Bancshares expanded the Company’s service area in South Texas by adding three offices in Houston and one office each in Austin, Cedar Park, Lockhart, and San Antonio.
	The following table provides a summary of the assets acquired and liabilities assumed as recorded by Bancshares, the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value, and the resultant fair values of those assets and liabilities as recorded by the Company. As provided for under GAAP, management has up to 12 months following the date of acquisition to finalize the fair values of the acquired assets and assumed liabilities. The fair value adjustments and the resultant fair values shown in the following table continue to be evaluated by management and may be subject to further adjustment.
			March 5, 2014
			As Recorded by			Fair Value					As Recorded
			Bancshares			Adjustments					by the
											Company
		(Dollars in thousands)
Assets acquired:
Cash and due from banks		$	102,156		$	0				$	102,156
Investment securities			1,860			(1	)		a		1,859
Loans and leases			165,939			(10,764	)		b		155,175
Allowance for loan losses			(5,280	)		5,280			b		0
Premises and equipment			6,259			1,619			c		7,878
Foreclosed assets			7,634			(2,916	)		d		4,718
Accrued interest receivable and other assets			608			(294	)		e		314
Core deposit intangible asset			0			2,648			f		2,648
Deferred income taxes			7,110			1,881			g		8,991
Total assets acquired			286,286			(2,547	)				283,739
Liabilities assumed:
Deposits			255,798			121			h		255,919
Accrued interest payable and other liabilities			1,358			295			i		1,653
Total liabilities assumed			257,156			416					257,572
Net assets acquired		$	29,130		$	(2,963	)				26,167
Total cash consideration paid											(21,500	)
Gain on acquisition										$	4,667
Explanation of fair value adjustments
a-		Adjustment reflects the fair value adjustment based on the Company’s pricing of the acquired investment securities portfolio.
b-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired loan portfolio and to eliminate the recorded allowance for loan losses.
c-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the premises and equipment acquired.
d-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired foreclosed assets.
e-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of accrued interest receivable and other assets.
f-		Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.
g-		This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes. Management has determined that acquired net operating loss carryforwards are expected to be settled in future periods where the realization of such benefits would be subject to limitations under section 382 of the Internal Revenue Code (“section 382 limitations”). Accordingly, as of the date of acquisition, the Company had established a deferred tax asset valuation allowance of approximately $0.5 million to reflect its assessment that the realization of the benefits from the settlement of these acquired net operating losses is expected to be subject to section 382 limitations. To the extent that additional information becomes available, management may be required to adjust its estimates and assumptions regarding the realization of the benefits associated with these acquired net operating losses by adjusting this deferred tax asset valuation allowance.
h-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired deposits.
i-		Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of Bancshares.
The Company’s consolidated results of operations include the operating results for Bancshares beginning March 6, 2014 through the end of the reporting period. For the three months ended September 30, 2014, Bancshares’ operating results contributed $2.1 million of net interest income and $1.1 million of net income to the Company’s results of operations. For the nine months ended September 30, 2014, Bancshares’ operating results contributed $5.5 million of net interest income and $7.5 million of net income, including the $4.7 million of tax-exempt bargain purchase gain, to the Company’s results of operations.
The First National Bank of Shelby
On July 31, 2013, the Company completed the First National Bank acquisition whereby First National Bank merged with and into the Company’s wholly-owned bank subsidiary for an aggregate of $8.4 million in cash and 2,514,770 split-adjusted shares of its common stock. The Company also acquired certain real property from parties related to First National Bank and on which certain First National Bank offices are located for $3.8 million in cash.
The acquisition of First National Bank expanded the Company’s service area in North Carolina by adding 14 offices in Shelby, North Carolina and the surrounding communities. On September 24, 2013 the Company closed one of the acquired offices in Shelby, North Carolina.
During the second quarter of 2014, management revised its initial estimates and assumptions regarding the expected recovery of acquired assets with built-in losses, specifically the timing of expected charge-offs of purchased non-covered loans, in the First National Bank acquisition. As a result of such revision, management concluded that the deferred tax asset valuation allowance of $4.1 million was not necessary. Because such revision occurred during the first 12 months following the date of acquisition and was not the result of changes in circumstances, management has recast the third quarter 2013 financial statements, along with all subsequent financial statements, to increase the bargain purchase gain on the First National Bank acquisition by $4.1 million to reflect this change in estimate.
The following table provides a summary of the assets acquired and liabilities assumed as recorded by First National Bank, the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value, the recast adjustment described above and the resultant fair values of those assets and liabilities as recorded by the Company.
		July 31, 2013
		As Recorded			Fair Value					Recast			As Recorded
		by First			Adjustments					Adjustment			by the
		National Bank											Company
		(Dollars in thousands)
Assets acquired:
Cash and due from banks		$	69,285		$	0				$	0		$	69,285
Investment securities			149,943			(599	)		a		0			149,344
Loans and leases			432,250			(44,183	)		b		0			388,067
Allowance for loan losses			(13,931	)		13,931			b		0			0
Premises and equipment			14,318			5,064			c		0			19,382
Foreclosed assets			3,073			(915	)		d		0			2,158
Accrued interest receivable			1,234			(110	)		e		0			1,124
BOLI			14,812			0					0			14,812
Core deposit intangible asset			0			10,136			f		0			10,136
Deferred income taxes			12,179			12,325			g		4,102			28,606
Other assets			4,277			(251	)		e		0			4,026
Total assets acquired			687,440			(4,602	)				4,102			686,940
Liabilities assumed:
Deposits			595,668			4,950			h		0			600,618
Repurchase agreements with customers			6,405			0					0			6,405
Accrued interest payable and other			1,296			1,164			i		0			2,460
liabilities
Total liabilities assumed			603,369			6,114					0			609,483
Net assets acquired		$	84,071		$	(10,716	)			$	4,102			77,457
Consideration paid:
Cash														(12,215	)
Common stock														(60,079	)
Total consideration paid														(72,294	)
Gain on acquisition													$	5,163
Explanation of fair value adjustments
a-		Adjustment reflects the fair value adjustment based on the Company’s pricing of the acquired investment securities portfolio.
b-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired loan portfolio and to eliminate the
		recorded allowance for loan losses.
c-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the premises and equipment acquired.
d-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired foreclosed assets.
e-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of accrued interest receivable and other assets.
f-		Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.
g-		This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes. Management initially determined that acquired net operating loss carryforwards and other acquired assets with built-in losses were expected to be settled or otherwise recovered in future periods where the realization of such benefits would be subject to section 382 limitations. Accordingly, at the date of acquisition, the Company established a deferred tax asset valuation allowance of approximately $4.1 million to reflect its initial assessment that the realization of the benefits from the settlement or recovery of certain of these acquired assets and net operating losses was expected to be subject to section 382 limitations. During the second quarter of 2014, management determined such valuation allowance was not necessary. Accordingly, the Company’s acquisition of
		First National Bank has been recast to reflect such determination.
h-		Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired deposits.
i-		Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of First National Bank.
Beginning August 1, 2013, First National Bank operations are included in the Company’s consolidated results of operations.
As a result of the recast adjustment described above, certain amounts previously reported in the Company’s consolidated financial statements have been recast. The following is a summary of those financial statement captions that have been impacted by this recast adjustment.
		As Previously			Recast			As Recast
		Reported			Adjustment
		(Dollars in thousands, except per share amounts)
September 30, 2013:
Deferred income tax asset valuation allowance		$	(4,102	)	$	4,102		$	0
Total stockholders’ equity before noncontrolling interest			608,236			4,102			612,338
Gain on merger and acquisition transaction			1,061			4,102			5,163
Net income available to common stockholders			62,737			4,102			66,839
Diluted earnings per common share, split adjusted		$	0.87		$	0.06		$	0.93

Earnings_Per_Common_Share_EPS

Earnings Per Common Share ("EPS")	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Common Share ("EPS")	'
	4	Earnings Per Common Share (“EPS”)
	Basic EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding. Diluted EPS is computed by dividing net income available to common stockholders by the weighted-average number of common shares outstanding after consideration of the dilutive effect, if any, of the Company’s outstanding common stock options using the treasury stock method. No options to purchase shares of the Company’s common stock for the three months and nine months ended September 30, 2014 and the three months ended September 30, 2013 were excluded from the diluted EPS calculations as all options were dilutive. For the nine months ended September 30, 2013, options to purchase 4,000 split-adjusted shares of the Company’s common stock were excluded from the diluted EPS calculations as inclusion of these options would have been anti-dilutive.
	The following table presents the computation of basic and diluted EPS for the periods indicated.
			Three Months Ended				Nine Months Ended
			September 30,				September 30,
			2014		2013		2014		2013
			(In thousands, except per share amounts)
	Numerator:
	Distributed earnings allocated to common stock		$	9,560	$	6,732	$	26,166	$	18,036
	Undistributed earnings allocated to common stock			22,533		19,720		57,689		48,803
	Net income available to common stock		$	32,093	$	26,452	$	83,855	$	66,839
	Denominator:
	Denominator for basic EPS – weighted-average common shares			79,678		72,544		76,763		71,338
	Effect of dilutive securities – stock options			767		752		706		650
	Denominator for diluted EPS – weighted-average common shares and assumed conversions			80,445		73,296		77,469		71,988
	Basic EPS		$	0.4	$	0.36	$	1.09	$	0.94
	Diluted EPS		$	0.4	$	0.36	$	1.08	$	0.93

Investment_Securities

Investment Securities	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Investment Securities	'
	5	Investment Securities
	At September 30, 2014 and 2013 and at December 31, 2013, the Company classified all of its investment securities portfolio as AFS. Accordingly, its investment securities are stated at estimated fair value in the consolidated financial statements with unrealized gains and losses, net of related income tax, reported as a separate component of stockholders’ equity and included in accumulated other comprehensive income (loss).
	The following table presents the amortized cost and estimated fair value of investment securities AFS as of the dates indicated. The Company’s holdings of “other equity securities” include Federal Home Loan Bank of Dallas (“FHLB – Dallas”) and First National Banker’s Bankshares, Inc. (“FNBB”) shares, which do not have readily determinable fair values and are carried at cost.
			Amortized			Gross		Gross			Estimated
			Cost			Unrealized		Unrealized			Fair Value
						Gains		Losses
			(Dollars in thousands)
	September 30, 2014:
	Obligations of state and political subdivisions		$	572,070		$	16,610	$	(1,101	)	$	587,579
	U.S. Government agency securities			251,926			4,427		(2,291	)		254,062
	Corporate obligations			655			0		0			655
	Other equity securities			17,580			0		0			17,580
	Total		$	842,231		$	21,037	$	(3,392	)	$	859,876
	December 31, 2013:
	Obligations of state and political subdivisions		$	438,390		$	6,230	$	(8,631	)	$	435,989
	U.S. Government agency securities			222,510			2,352		(5,993	)		218,869
	Corporate obligations			716			0		0			716
	Other equity securities			13,810			0		0			13,810
	Total		$	675,426		$	8,582	$	(14,624	)	$	669,384
	September 30, 2013:
	Obligations of state and political subdivisions		$	432,362		$	7,423	$	(8,217	)	$	431,568
	U.S. Government agency securities			225,263			4,077		(4,029	)		225,311
	Corporate obligations			717			0		0			717
	Other equity securities			13,797			0		0			13,797
	Total		$	672,139		$	11,500	$	(12,246	)	$	671,393
	The following table shows estimated fair value of investment securities AFS having gross unrealized losses and the amount of such unrealized losses, aggregated by investment category and length of time that individual investment securities have been in a continuous unrealized loss position, as of the dates indicated.
			Less than 12 Months					12 Months or More					Total
			Estimated			Unrealized		Estimated			Unrealized		Estimated		Unrealized
			Fair Value			Losses		Fair Value			Losses		Fair Value		Losses
			(Dollars in thousands)
	September 30, 2014:
	Obligations of state and political subdivisions		$	40,386		$	146	$	53,628		$	955	$	94,014	$	1,101
	U.S. Government agency securities			44,958			226		57,610			2,065		102,568		2,291
	Total temporarily impaired securities		$	85,344		$	372	$	111,238		$	3,020	$	196,582	$	3,392
	December 31, 2013:
	Obligations of states and political subdivisions		$	132,568		$	7,237	$	10,823		$	1,394	$	143,391	$	8,631
	U.S. Government agency securities			127,274			5,993		0			0		127,274		5,993
	Total temporarily impaired securities		$	259,842		$	13,230	$	10,823		$	1,394	$	270,665	$	14,624
	September 30, 2013:
	Obligations of state and political subdivisions		$	122,614		$	7,523	$	8,020		$	694	$	130,634	$	8,217
	U.S. Government agency securities			60,861			4,029		0			0		60,861		4,029
	Total temporarily impaired securities		$	183,475		$	11,552	$	8,020		$	694	$	191,495	$	12,246
	In evaluating the Company’s unrealized loss positions for other-than-temporary impairment of its investment securities portfolio, management considers the credit quality of the issuer, the nature and cause of the unrealized loss, the severity and duration of the impairments and other factors. At September 30, 2014 management determined the unrealized losses were the result of fluctuations in interest rates and did not reflect deteriorations of the credit quality of the investments. Accordingly, management considers these unrealized losses to be temporary in nature. The Company does not have the intent to sell these investment securities with unrealized losses and, more likely than not, will not be required to sell these investment securities before fair value recovers to amortized cost.
	The following table shows the amortized cost and estimated fair value of investment securities AFS by maturity or estimated date of repayment as of the date indicated.
			September 30, 2014
	Maturity or		Amortized			Estimated
			Cost			Fair Value
	Estimated Repayment
			(Dollars in thousands)
	One year or less		$	37,664		$	38,291
	After one year to five years			138,870			140,563
	After five years to ten years			194,325			196,655
	After ten years			471,372			484,367
	Total		$	842,231		$	859,876
	For purposes of this maturity distribution, all investment securities AFS are shown based on their contractual maturity date or estimated date of repayment, except (i) FHLB – Dallas and FNBB stock with no contractual maturity date are shown in the longest maturity category and (ii) U.S. Government agency securities and municipal housing authority securities backed by residential mortgages are allocated among various maturities based on an estimated repayment schedule utilizing Bloomberg median prepayment speeds or other estimates of prepayment speeds and interest rate levels at the measurement date. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
	The following table is a summary of sales activities in the Company’s investment securities AFS for the periods indicated.
			Three Months					Nine Months Ended
			Ended					September 30,
			September 30,
			2014			2013		2014			2013
			(Dollars in thousands)
	Sales proceeds		$	6,563		$	0	$	54,957		$	999
	Gross realized gains		$	58		$	0	$	82		$	156
Gross realized losses			(15	)		0		(15	)		0
Net gains on investment securities		$	43		$	0	$	67		$	156

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators	'
	6	Allowance for Loan and Lease Losses (“ALLL”) and Credit Quality Indicators
	Allowance for Loan and Lease Losses
	The following table is a summary of activity within the ALLL for the periods indicated.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
			(Dollars in thousands)
	Beginning balance		$	46,958		$	39,372		$	42,945		$	38,738
	Non-purchased loans and leases charged off			(737	)		(754	)		(3,306	)		(3,203	)
	Recoveries of non-purchased loans and leases previously charged off			185			142			1,167			925
	Net non-purchased loans and leases charged off			(552	)		(612	)		(2,139	)		(2,278	)
	Covered loans charged off			(205	)		(918	)		(925	)		(4,012	)
	Purchased non-covered loans charged off			(282	)		0			(849	)		0
	Net charge-offs – total loans and leases			(1,039	)		(1,530	)		(3,913	)		(6,290	)
	Provision for loan and lease losses:
	Non-purchased loans and leases			3,200			2,900			8,800			5,200
	Covered loans			205			918			925			4,012
	Purchased non-covered loans			282			0			849			0
	Total provision			3,687			3,818			10,574			9,212
	Ending balance		$	49,606		$	41,660		$	49,606		$	41,660
	At September 30, 2014 and 2013, the Company identified covered loans acquired in its FDIC-assisted acquisitions where the expected performance of such loans had deteriorated from management’s performance expectations established in conjunction with the determination of the Day 1 Fair Values. As a result the Company recorded partial charge-offs, net of adjustments to the FDIC loss share receivable and the FDIC clawback payable, totaling $0.2 million for such loans during the third quarter of 2014 and $0.9 million for such loans during the first nine months of 2014 compared to $0.9 million for such loans during the third quarter of 2013 and $4.0 million for such loans during the first nine months of 2013. The Company also recorded provision for loan and lease losses of $0.2 million during the third quarter of 2014 and $0.9 million during the first nine months of 2014 compared to $0.9 million for such loans during the third quarter of 2013 and $4.0 million for such loans during the first nine months of 2013 to cover such charge-offs. In addition to those net charge-offs, the Company transferred certain of these covered loans to covered foreclosed assets. As a result, the Company had $13.6 million and $52.6 million, respectively, of impaired covered loans at September 30, 2014 and 2013.
	As of September 30, 2014, the Company had identified purchased non-covered loans where the expected performance had deteriorated from management’s performance expectations established in conjunction with the determination of the Day 1 Fair Values or where current information indicates it is probable that the Company will not be able to collect all amounts according to the contractual terms thereon. As a result, the Company recorded partial charge-offs totaling $0.3 million during the third quarter and $0.9 million during the first nine months of 2014 compared to none for the comparable periods in 2013. The Company also recorded provision for loan and lease losses of $0.3 million during the third quarter and $0.9 million during the first nine months of 2014 to cover such charge-offs compared to none during the third quarter and first nine months of 2013. At September 30, 2014, the Company had $1.7 million of impaired purchased non-covered loans compared to none at both September 30, 2013 and December 31, 2013.
	The following table is a summary of the Company’s ALLL for the periods indicated.
			Beginning			Charge-offs			Recoveries			Provision			Ending
			Balance												Balance
			(Dollars in thousands)
	Three months ended September 30, 2014:
	Real estate:
	Residential 1-4 family		$	4,760		$	(115	)	$	47		$	610		$	5,302
	Non-farm/non-residential			14,836			(90	)		15			3,267			18,028
	Construction/land development			15,464			0			4			(950	)		14,518
	Agricultural			2,908			(198	)		2			(98	)		2,614
	Multifamily residential			1,772			0			0			(161	)		1,611
	Commercial and industrial			2,848			(55	)		38			108			2,939
	Consumer			926			(29	)		14			(89	)		822
	Direct financing leases			2,572			(151	)		29			371			2,821
	Other			872			(99	)		36			142			951
	Covered loans			0			(205	)		0			205			0
	Purchased non-covered loans			0			(282	)		0			282			0
	Total		$	46,958		$	(1,224	)	$	185		$	3,687		$	49,606
	Nine months ended September 30, 2014:
	Real estate:
	Residential 1-4 family		$	4,701		$	(456	)	$	118		$	939		$	5,302
	Non-farm/non-residential			13,633			(1,344	)		19			5,720			18,028
	Construction/land development			12,306			(14	)		12			2,214			14,518
	Agricultural			3,000			(213	)		13			(186	)		2,614
	Multifamily residential			2,504			0			0			(893	)		1,611
	Commercial and industrial			2,855			(477	)		801			(240	)		2,939
	Consumer			917			(126	)		50			(19	)		822
	Direct financing leases			2,266			(418	)		43			930			2,821
	Other			763			(258	)		111			335			951
	Covered loans			0			(925	)		0			925			0
	Purchased non-covered loans			0			(849	)		0			849			0
	Total		$	42,945		$	(5,080	)	$	1,167		$	10,574		$	49,606
	The following table is a summary of the Company’s ALLL for the periods indicated.
			Beginning			Charge-offs			Recoveries			Provision			Ending
			Balance												Balance
			(Dollars in thousands)
	Year ended December 31, 2013:
	Real estate:
	Residential 1-4 family		$	4,820		$	(837	)	$	106		$	612		$	4,701
	Non-farm/non-residential			10,107			(1,111	)		122			4,515			13,633
	Construction/land development			12,000			(137	)		174			269			12,306
Agricultural			2,878			(261	)		14			369			3,000
Multifamily residential			2,030			(4	)		4			474			2,504
Commercial and industrial			3,655			(922	)		433			(311	)		2,855
Consumer			1,015			(214	)		104			12			917
Direct financing leases			2,050			(482	)		33			665			2,266
Other			183			(359	)		144			795			763
Covered loans			0			(4,675	)		0			4,675			0
Total		$	38,738		$	(9,002	)	$	1,134		$	12,075		$	42,945
Three months ended September 30, 2013:
Real estate:
Residential 1-4 family		$	4,653		$	(111	)	$	11		$	294		$	4,847
Non-farm/non-residential			12,464			(19	)		0			304			12,749
Construction/land development			11,290			(7	)		13			1,434			12,730
Agricultural			2,595			(260	)		5			182			2,522
Multifamily residential			1,854			0			0			203			2,057
Commercial and industrial			2,929			(55	)		56			(172	)		2,758
Consumer			993			(57	)		19			(13	)		942
Direct financing leases			2,041			(152	)		9			262			2,160
Other			553			(93	)		29			406			895
Covered loans			0			(918	)		0			918			0
Total		$	39,372		$	(1,672	)	$	142		$	3,818		$	41,660
Nine months ended September 30, 2013:
Real estate:
Residential 1-4 family		$	4,820		$	(528	)	$	113		$	442		$	4,847
Non-farm/non-residential			10,107			(612	)		118			3,136			12,749
Construction/land development			12,000			(136	)		21			845			12,730
Agricultural			2,878			(260	)		9			(105	)		2,522
Multifamily residential			2,030			0			0			27			2,057
Commercial and industrial			3,655			(887	)		431			(441	)		2,758
Consumer			1,015			(176	)		90			13			942
Direct financing leases			2,050			(338	)		29			419			2,160
Other			183			(266	)		114			864			895
Covered loans			0			(4,012	)		0			4,012			0
Total		$	38,738		$	(7,215	)	$	925		$	9,212		$	41,660
The following table is a summary of the Company’s ALLL and recorded investment in non-purchased loans and leases, as of the dates indicated.
		Allowance for Non-Purchased									Non-Purchased Loans and Leases
		Loan and Lease Losses
		ALLL for			ALLL for			Total			Individually			All Other		Total Loans
		Individually			All Other			ALLL			Evaluated			Loans and		and Leases
		Evaluated			Loans and						Impaired			Leases
		Impaired			Leases						Loans and
		Loans and									Leases
		Leases
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	345		$	4,957		$	5,302		$	2,360		$	275,981	$	278,341
Non-farm/non-residential			24			18,004			18,028			2,300			1,370,994		1,373,294
Construction/land development			2			14,516			14,518			10,191			1,223,062		1,233,253
Agricultural			30			2,584			2,614			376			46,345		46,721
Multifamily residential			0			1,611			1,611			0			155,940		155,940
Commercial and industrial			606			2,333			2,939			578			312,714		313,292
Consumer			3			819			822			32			25,367		25,399
Direct financing leases			0			2,821			2,821			0			109,059		109,059
Other			0			951			951			8			103,835		103,843
Total		$	1,010		$	48,596		$	49,606		$	15,845		$	3,623,297	$	3,639,142
December 31, 2013:
Real estate:
Residential 1-4 family		$	438		$	4,263		$	4,701		$	4,047		$	245,509	$	249,556
Non-farm/non-residential			15			13,618			13,633			2,159			1,101,955		1,104,114
Construction/land development			2			12,304			12,306			236			722,321		722,557
Agricultural			229			2,771			3,000			883			44,313		45,196
Multifamily residential			0			2,504			2,504			0			208,337		208,337
Commercial and industrial			652			2,203			2,855			686			123,382		124,068
Consumer			3			914			917			50			26,132		26,182
Direct financing leases			0			2,266			2,266			0			86,321		86,321
Other			2			761			763			26			66,208		66,234
Total		$	1,341		$	41,604		$	42,945		$	8,087		$	2,624,478	$	2,632,565
September 30, 2013:
Real estate:
Residential 1-4 family		$	490		$	4,357		$	4,847		$	3,535		$	247,491	$	251,026
Non-farm/non-residential			6			12,743			12,749			3,572			1,032,046		1,035,618
Construction/land development			2			12,728			12,730			217			713,981		714,198
Agricultural			187			2,335			2,522			951			47,002		47,953
Multifamily residential			0			2,057			2,057			310			163,606		163,916
Commercial and industrial			613			2,145			2,758			739			121,424		122,163
Consumer			4			938			942			33			27,265		27,298
Direct financing leases			0			2,160			2,160			0			81,984		81,984
Other			1			894			895			20			78,413		78,433
Total		$	1,303		$	40,357		$	41,660		$	9,377		$	2,513,212	$	2,522,589
The following table is a summary of impaired non-purchased loans and leases as of and for the three months and nine months ended September 30, 2014.
		Principal			Net			Principal			Specific			Weighted		Weighted
		Balance			Charge-offs			Balance,			ALLL			Average		Average
					to Date			Net of						Carrying		Carrying
								Charge-offs						Value – Three		Value – Nine
														Months Ended		Months Ended
														September 30,		September 30,
														2014		2014
		(Dollars in thousands)
Impaired loans and leases for which there is a related ALLL:
Real estate:
Residential 1-4 family		$	2,984		$	(1,654	)	$	1,330		$	345		$	1,452	$	1,564
Non-farm/non-residential			415			(216	)		199			24			121		87
Construction/land development			36			(22	)		14			2			16		16
Agricultural			116			(12	)		104			30			214		311
Commercial and industrial			1,314			(764	)		550			606			555		571
Consumer			101			(84	)		17			3			20		22
Other			0			(0	)		0			0			0		4
Total impaired loans and leases with a related ALLL			4,966			(2,752	)		2,214			1,010			2,378		2,575
Impaired loans and leases for which there is not a related ALLL:
Real estate:
Residential 1-4 family			1,343			(313	)		1,030			0			1,352		1,802
Non-farm/non-residential			2,826			(725	)		2,101			0			2,210		2,025
Construction/land development			10,258			(81	)		10,177			0			9,949		5,107
Agricultural			474			(202	)		272			0			397		419
Multifamily residential			133			(133	)		0			0			246		123
Commercial and industrial			187			(159	)		28			0			79		73
Consumer			20			(5	)		15			0			17		21
Other			8			(0	)		8			0			8		9
Total impaired loans and leases without a related ALLL			15,249			(1,618	)		13,631			0			14,258		9,579
Total impaired loans and leases		$	20,215		$	(4,370	)	$	15,845		$	1,010		$	16,636	$	12,154
The following table is a summary of impaired non-purchased loans and leases as of and for the year ended December 31, 2013.
		Principal			Net			Principal			Specific			Weighted
		Balance			Charge-offs			Balance,			ALLL			Average
					to Date			Net of						Carrying
								Charge-offs						Value – Year
														Ended
														December 31,
														2013
		(Dollars in thousands)
Impaired loans and leases for which there is a related ALLL:
Real estate:
Residential 1-4 family		$	3,609		$	(1,692	)	$	1,917		$	438		$	1,638
Non-farm/non-residential			121			(75	)		46			15			93
Construction/land development			38			(22	)		16			2			17
Agricultural			511			(42	)		469			229			514
Commercial and industrial			2,016			(1,405	)		611			652			578
Consumer			178			(156	)		22			3			10
Other			40			(25	)		15			2			10
Total impaired loans and leases with a related ALLL			6,513			(3,417	)		3,096			1,341			2,860
Impaired loans and leases for which there is not a related ALLL:
Real estate:
Residential 1-4 family			2,939			(808	)		2,131			0			1,541
Non-farm/non-residential			3,234			(1,120	)		2,114			0			4,344
Construction/land development			300			(81	)		219			0			303
Agricultural			426			(12	)		414			0			404
Multifamily residential			133			(133	)		0			0			124
Commercial and industrial			85			(10	)		75			0			172
Consumer			39			(12	)		27			0			24
Other			31			(20	)		11			0			9
Total impaired loans and leases without a related ALLL			7,187			(2,196	)		4,991			0			6,921
Total impaired loans and leases		$	13,700		$	(5,613	)	$	8,087		$	1,341		$	9,781
The following table is a summary of impaired non-purchased loans and leases as of and for the three months and nine months ended September 30, 2013.
		Principal			Net			Principal			Specific			Weighted		Weighted
		Balance			Charge-offs			Balance,			ALLL			Average		Average
					to Date			Net of						Carrying		Carrying
								Charge-offs						Value – Three		Value – Nine
														Months Ended		Months Ended
														September 30,		September 30,
														2013		2013
		(Dollars in thousands)
Impaired loans and leases for which there is a related ALLL:
Real estate:
Residential 1-4 family		$	3,601		$	(1,662	)	$	1,939		$	490		$	1,624	$	1,569
Non-farm/non-residential			37			0			37			6			24		105
Construction/land development			129			(112	)		17			2			8		17
Agricultural			459			(42	)		417			187			421		525
Commercial and industrial			2,270			(1,713	)		557			613			558		570
Consumer			39			(13	)		26			4			13		7
Other			145			(137	)		8			1			8		9
Total impaired loans and leases with a related ALLL			6,680			(3,679	)		3,001			1,303			2,656		2,802
Impaired loans and leases for which there is not a related ALLL:
Real estate:
Residential 1-4 family			2,244			(648	)		1,596			0			1,507		1,394
Non-farm/non-residential			4,645			(1,110	)		3,535			0			6,957		4,902
Construction/land development			281			(81	)		200			0			236		324
Agricultural			801			(267	)		534			0			386		401
Multifamily residential			443			(133	)		310			0			311		155
Commercial and industrial			397			(215	)		182			0			166		196
Consumer			19			(12	)		7			0			7		23
Other			32			(20	)		12			0			8		8
Total impaired loans and leases without a related ALLL			8,862			(2,486	)		6,376			0			9,578		7,403
Total impaired loans and leases		$	15,542		$	(6,165	)	$	9,377		$	1,303		$	12,234	$	10,205
Management has determined that certain of the Company’s impaired non-purchased loans and leases do not require any specific allowance at September 30, 2014 and 2013 or at December 31, 2013 because (i) management’s analysis of such individual loans and leases resulted in no impairment or (ii) all identified impairment on such loans and leases has previously been charged off.
Interest income on impaired non-purchased loans and leases is recognized on a cash basis when and if actually collected. Total interest income recognized on impaired non-purchased loans and leases for the three months and nine months ended September 30, 2014 and 2013 and for the year ended December 31, 2013 was not material.
Credit Quality Indicators
Non-Purchased Loans and Leases
The following table is a summary of credit quality indicators for the Company’s non-purchased loans and leases as of the dates indicated.
		Satisfactory			Moderate			Watch			Substandard			Total
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family (1)		$	268,707		$	0		$	3,797		$	5,837		$	278,341
Non-farm/non-residential			1,170,334			141,395			54,078			7,487			1,373,294
Construction/land development			1,016,496			186,496			16,979			13,282			1,233,253
Agricultural			24,335			10,202			10,062			2,122			46,721
Multifamily residential			119,765			35,039			382			754			155,940
Commercial and industrial			267,178			43,286			1,347			1,481			313,292
Consumer (1)			24,879			0			263			257			25,399
Direct financing leases			108,126			829			32			72			109,059
Other (1)			99,786			3,853			180			24			103,843
Total		$	3,099,606		$	421,100		$	87,120		$	31,316		$	3,639,142
December 31, 2013:
Real estate:
Residential 1-4 family (1)		$	239,940		$	0		$	3,140		$	6,476		$	249,556
Non-farm/non-residential			916,304			128,624			52,388			6,798			1,104,114
Construction/land development			550,436			144,435			23,574			4,112			722,557
Agricultural			21,647			11,098			9,788			2,663			45,196
Multifamily residential			177,144			30,029			391			773			208,337
Commercial and industrial			87,568			33,071			1,664			1,765			124,068
Consumer (1)			25,574			0			230			378			26,182
Direct financing leases			85,363			955			0			3			86,321
Other (1)			63,799			2,237			119			79			66,234
Total		$	2,167,775		$	350,449		$	91,294		$	23,047		$	2,632,565
September 30, 2013:
Real estate:
Residential 1-4 family(1)		$	242,202		$	0		$	1,438		$	7,386		$	251,026
Non-farm/non-residential			839,345			134,754			51,589			9,930			1,035,618
Construction/land development			544,324			136,270			29,122			4,482			714,198
Agricultural			23,926			11,688			9,317			3,022			47,953
Multifamily residential			132,722			29,716			394			1,084			163,916
Commercial and industrial			91,913			26,843			1,210			2,197			122,163
Consumer(1)			26,763			0			172			363			27,298
Direct financing leases			80,967			992			0			25			81,984
Other(1)			74,221			4,005			132			75			78,433
Total		$	2,056,383		$	344,268		$	93,374		$	28,564		$	2,522,589
-1	The Company does not risk rate its residential 1-4 family loans, its consumer loans, and certain “other” loans. However, for purposes of the above table, the Company considers such loans to be (i) satisfactory – if they are performing and less than 30 days past due, (ii) watch – if they are performing and 30 to 89 days past due or (iii) substandard – if they are nonperforming or 90 days or more past due.
The following categories of credit quality indicators are used by the Company.
Satisfactory – Loans and leases in this category are considered to be a satisfactory credit risk and are generally considered to be collectible in full.
Moderate – Loans and leases in this category are considered to be a marginally satisfactory credit risk and are generally considered to be collectible in full.
Watch – Loans and leases in this category are presently protected from apparent loss; however, weaknesses exist which could cause future impairment of repayment of principal or interest.
Substandard – Loans and leases in this category are characterized by deterioration in quality exhibited by a number of weaknesses requiring corrective action and posing risk of some loss.
The following table is an aging analysis of past due non-purchased loans and leases as of the dates indicated.
		30-89 Days			90 Days			Total			Current (3)			Total
		Past Due (1)			or More (2)			Past Due
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	4,203		$	1,230		$	5,433		$	272,908		$	278,341
Non-farm/non-residential			879			1,432			2,311			1,370,983			1,373,294
Construction/land development			1,854			10,017			11,871			1,221,382			1,233,253
Agricultural			1,574			192			1,766			44,955			46,721
Multifamily residential			0			0			0			155,940			155,940
Commercial and industrial			813			28			841			312,451			313,292
Consumer			295			35			330			25,069			25,399
Direct financing leases			0			0			0			109,059			109,059
Other			12			0			12			103,831			103,843
Total		$	9,630		$	12,934		$	22,564		$	3,616,578		$	3,639,142
December 31, 2013:
Real estate:
Residential 1-4 family		$	4,228		$	2,004		$	6,232		$	243,324		$	249,556
Non-farm/non-residential			2,093			1,867			3,960			1,100,154			1,104,114
Construction/land development			235			153			388			722,169			722,557
Agricultural			517			540			1,057			44,139			45,196
Multifamily residential			773			0			773			207,564			208,337
Commercial and industrial			418			31			449			123,619			124,068
Consumer			261			78			339			25,843			26,182
Direct financing leases			0			0			0			86,321			86,321
Other			18			24			42			66,192			66,234
Total		$	8,543		$	4,697		$	13,240		$	2,619,325		$	2,632,565
September 30, 2013:
Real estate:
Residential 1-4 family		$	1,661		$	2,376		$	4,037		$	246,989		$	251,026
Non-farm/non-residential			2,321			3,312			5,633			1,029,985			1,035,618
Construction/land development			1,662			136			1,798			712,400			714,198
Agricultural			322			571			893			47,060			47,953
Multifamily residential			0			310			310			163,606			163,916
Commercial and industrial			349			131			480			121,683			122,163
Consumer			177			66			243			27,055			27,298
Direct financing leases			111			25			136			81,848			81,984
Other			17			0			17			78,416			78,433
Total		$	6,620		$	6,927		$	13,547		$	2,509,042		$	2,522,589
-1	Includes $0.9 million, $0.8 million and $0.4 million of loans and leases on nonaccrual status at September 30, 2014, December 31, 2013 and September 30, 2013, respectively.
-2	All loans and leases greater than 90 days past due were on nonaccrual status at September 30, 2014 and 2013 and December 31, 2013.
-3	Includes $3.9 million, $3.2 million and $3.1 million of loans and leases on nonaccrual status at September 30, 2014, December 31, 2013 and September 30, 2013, respectively.
Covered Loans
The following table is a summary of credit quality indicators for the Company’s covered loans as of the dates indicated.
		FV 1			FV 2			Total
								Covered
								Loans
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	86,067		$	2,208		$	88,275
Non-farm/non-residential			107,046			6,587			113,633
Construction/land development			23,970			3,648			27,618
Agricultural			9,539			338			9,877
Multifamily residential			3,513			315			3,828
Commercial and industrial			4,819			535			5,354
Consumer			61			3			64
Other			153			0			153
Total		$	235,168		$	13,634		$	248,802
December 31, 2013:
Real estate:
Residential 1-4 family		$	105,218		$	5,835		$	111,053
Non-farm/non-residential			138,573			25,135			163,708
Construction/land development			33,475			14,267			47,742
Agricultural			10,807			343			11,150
Multifamily residential			8,709			457			9,166
Commercial and industrial			8,582			137			8,719
Consumer			106			5			111
Other			142			0			142
Total		$	305,612		$	46,179		$	351,791
September 30, 2013:
Real estate:
Residential 1-4 family		$	114,163		$	6,378		$	120,541
Non-farm/non-residential			171,886			25,566			197,452
Construction/land development			40,172			19,215			59,387
Agricultural			11,203			1,138			12,341
Multifamily residential			9,153			215			9,368
Commercial and industrial			9,877			57			9,934
Consumer			132			6			138
Other			158			0			158
Total		$	356,744		$	52,575		$	409,319
For covered loans, management separately monitors this portfolio and periodically reviews loans contained within this portfolio against the factors and assumptions used in determining the Day 1 Fair Values. To the extent that a loan is performing in accordance with or exceeding management’s expectation established in conjunction with the determination of the Day 1 Fair Values, such loan is rated FV 1. For any loan that is exceeding management’s performance expectation established in conjunction with the determination of Day 1 Fair Values, the accretable yield on such loan is adjusted to reflect such increased performance. To the extent that a loan’s performance has deteriorated from management’s expectation established in conjunction with the determination of the Day 1 Fair Values, such loan is rated FV 2. At September 30, 2014 and 2013 and December 31, 2013, the Company had no allowance for its covered loans because all losses had been charged off on covered loans whose performance had deteriorated from management’s expectations established in conjunction with the determination of the Day 1 Fair Values.
The following table is an aging analysis of past due covered loans as of the dates indicated.
		30-89 Days			90 Days			Total			Current			Total
		Past Due			or More			Past Due						Covered
														Loans
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	3,075		$	7,298		$	10,373		$	77,902		$	88,275
Non-farm/non-residential			3,481			8,112			11,593			102,040			113,633
Construction/land development			922			5,008			5,930			21,688			27,618
Agricultural			0			1,652			1,652			8,225			9,877
Multifamily residential			0			0			0			3,828			3,828
Commercial and industrial			9			603			612			4,742			5,354
Consumer			10			0			10			54			64
Other			0			0			0			153			153
Total		$	7,497		$	22,673		$	30,170		$	218,632		$	248,802
December 31, 2013:
Real estate:
Residential 1-4 family		$	5,341		$	12,409		$	17,750		$	93,303		$	111,053
Non-farm/non-residential			6,954			32,462			39,416			124,292			163,708
Construction/land development			2,173			20,914			23,087			24,655			47,742
Agricultural			237			1,328			1,565			9,585			11,150
Multifamily residential			375			3,240			3,615			5,551			9,166
Commercial and industrial			605			2,001			2,606			6,113			8,719
Consumer			10			0			10			101			111
Other			0			0			0			142			142
Total		$	15,695		$	72,354		$	88,049		$	263,742		$	351,791
September 30, 2013:
Real estate:
Residential 1-4 family		$	6,260		$	13,658		$	19,918		$	100,623		$	120,541
Non-farm/non-residential			8,557			39,841			48,398			149,054			197,452
Construction/land development			848			27,584			28,432			30,955			59,387
Agricultural			1,234			1,250			2,484			9,857			12,341
Multifamily residential			195			3,689			3,884			5,484			9,368
Commercial and industrial			27			2,961			2,988			6,946			9,934
Consumer			0			2			2			136			138
Other			0			0			0			158			158
Total		$	17,121		$	88,985		$	106,106		$	303,213		$	409,319
At September 30, 2014 and 2013 and December 31, 2013, significant portions of the Company’s covered loans were contractually past due, including many that were 90 days or more past due. However, the elevated level of delinquencies of covered loans at the dates of acquisition was considered in the Company’s performance expectations used in its determination of the Day 1 Fair Values for all covered loans. Accordingly, all covered loans continue to accrete interest income and all covered loans rated FV 1 continue to perform in accordance with or better than management’s expectations established in conjunction with the determination of the Day 1 Fair Values.
Purchased Non-Covered Loans
The following table is a summary of credit quality indicators for the Company’s purchased non-covered loans as of the dates indicated.
		Purchased Non-Covered Loans Without														Purchased Non-Covered				Total
		Evidence of Credit Deterioration at Acquisition														Loans With Evidence of				Purchased
																Credit Deterioration  at				Non-Covered
																Acquisition
		FV 33			FV 44			FV 55			FV 36			FV 77		FV 66		FV 88		Loans
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	74,617		$	81,344		$	30,058		$	75,815		$	143	$	17,236	$	60	$	279,273
Non-farm/non-residential			200,653			194,295			32,819			3,283			505		30,742		87		462,384
Construction/land development			28,857			33,070			9,607			13,783			9		9,011		0		94,337
Agricultural			12,510			26,723			3,053			1,933			0		189		0		44,408
Multifamily residential			9,877			13,019			7,226			940			72		2,764		781		34,679
Total real estate			326,514			348,451			82,763			95,754			729		59,942		928		915,081
Commercial and industrial			23,424			27,645			7,282			13,284			0		5,066		0		76,701
Consumer			2,498			884			627			16,023			0		429		0		20,461
Other			5,105			8,369			735			3,776			0		760		0		18,745
Total		$	357,541		$	385,349		$	91,407		$	128,837		$	729	$	66,197	$	928	$	1,030,988
December 31, 2013:
Real estate:
Residential 1-4 family		$	27,111		$	32,259		$	21,035		$	35,733		$	0	$	14,947	$	0	$	131,085
Non-farm/non-residential			42,193			72,621			20,685			1,191			0		16,258		0		152,948
Construction/land development			5,930			8,106			2,137			4,553			0		4,907		0		25,633
Agricultural			1,547			6,619			823			164			0		365		0		9,518
Multifamily residential			3,531			5,565			5,268			959			0		1,887		0		17,210
Total real estate			80,312			125,170			49,948			42,600			0		38,364		0		336,394
Commercial and industrial			9,592			9,730			2,250			1,879			0		1,483		0		24,934
Consumer			1,013			141			171			4,794			0		736		0		6,855
Other			1,202			2,897			157			237			0		47		0		4,540
Total		$	92,119		$	137,938		$	52,526		$	49,510		$	0	$	40,630	$	0	$	372,723
September 30, 2013:
Real estate:
Residential 1-4 family		$	28,486		$	34,113		$	21,592		$	36,221		$	0	$	16,311	$	0	$	136,723
Non-farm/non-residential			46,201			71,637			25,591			3,509			0		16,786		0		163,724
Construction/land development			5,973			8,578			2,495			4,680			0		5,052		0		26,778
Agricultural			2,109			6,705			851			173			0		242		0		10,080
Multifamily residential			3,621			5,662			5,322			978			0		2,419		0		18,002
Total real estate			86,390			126,695			55,851			45,561			0		40,810		0		355,307
Commercial and industrial			10,684			10,793			3,150			4,004			0		1,598		0		30,229
Consumer			1,980			147			181			5,990			0		878		0		9,176
Other			1,333			2,323			163			329			0		198		0		4,346
Total		$	100,387		$	139,958		$	59,345		$	55,884		$	0	$	43,484	$	0	$	399,058
The following grades are used for purchased non-covered loans without evidence of credit deterioration at the date of acquisition.
FV 33 – Loans in this category are considered to be satisfactory with minimal credit risk and are generally considered collectible.
FV 44 – Loans in this category are considered to be marginally satisfactory with minimal to moderate credit risk and are generally considered collectible.
FV 55 – Loans in this category exhibit weakness and are considered to have elevated credit risk and elevated risk of repayment.
FV 36 – Loans in this category were not individually reviewed at the date of purchase and are assumed to have characteristics similar to the characteristics of the aggregate acquired portfolio.
FV 77 – Loans in this category have deteriorated since the date of purchase and are considered impaired.
The following grades are used for purchased non-covered loans with evidence of credit deterioration at the date of acquisition.
FV 66 – Loans in this category are performing in accordance with or exceeding management’s performance expectations established in conjunction with the determination of Day 1 Fair Values.
FV 88 – Loans in this category have deteriorated from management’s performance expectations established in conjunction with the determination of Day 1 Fair Values.
The Company had no allowance for its purchased non-covered loans at September 30, 2014 and 2013 or December 31, 2013 as (i) all such loans were performing in accordance with management’s expectations established in conjunction with the determination of the Day 1 Fair Values or (ii) all losses on purchased non-covered loans whose performance had deteriorated from management’s expectations established in conjunction with the deterioration of the Day 1 Fair Values had been charged off.
The following table is an aging analysis of past due purchased non-covered loans as of the dates indicated.
		30-89 Days			90 Days			Total			Current			Total
		Past Due			or More			Past Due						Purchased
														Non-Covered
														Loans
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	6,026		$	6,220		$	12,246		$	267,027		$	279,273
Non-farm/non-residential			1,706			9,449			11,155			451,229			462,384
Construction/land development			855			1,476			2,331			92,006			94,337
Agriculture			211			146			357			44,051			44,408
Multifamily residential			0			1,228			1,228			33,451			34,679
Commercial and industrial			791			269			1,060			75,641			76,701
Consumer			196			159			355			20,106			20,461
Other			73			31			104			18,641			18,745
Total		$	9,858		$	18,978		$	28,836		$	1,002,152		$	1,030,988
December 31, 2013:
Real estate:
Residential 1-4 family		$	6,615		$	4,703		$	11,318		$	119,767		$	131,085
Non-farm/non-residential			4,886			5,779			10,665			142,283			152,948
Construction/land development			265			4,045			4,310			21,323			25,633
Agriculture			134			25			159			9,359			9,518
Multifamily residential			421			1,225			1,646			15,564			17,210
Commercial and industrial			614			388			1,002			23,932			24,934
Consumer			411			237			648			6,207			6,855
Other			0			33			33			4,507			4,540
Total		$	13,346		$	16,435		$	29,781		$	342,942		$	372,723
September 30, 2013:
Real estate:
Residential 1-4 family		$	4,026		$	3,647		$	7,673		$	129,050		$	136,723
Non-farm/non-residential			3,319			4,136			7,455			156,269			163,724
Construction/land development			4,601			7,367			11,968			14,810			26,778
Agriculture			0			101			101			9,979			10,080
Multifamily residential			177			1,326			1,503			16,499			18,002
Commercial and industrial			357			535			892			29,337			30,229
Consumer			310			223			533			8,643			9,176
Other			38			182			220			4,126			4,346
Total		$	12,828		$	17,517		$	30,345		$	368,713		$	399,058

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	7	Income Taxes
	The following table is a summary of the types of temporary differences between the tax basis of assets and liabilities and their financial reporting amounts that give rise to deferred income tax assets and liabilities and their approximate tax effects as of the dates indicated.
			September 30,					December 31,
			2014			2013		2013
			(Dollars in thousands)
	Deferred tax assets:
	Allowance for loan and lease losses		$	19,052		$	16,080	$	16,576
	Differences in amounts reflected in financial statements and income tax basis of purchased non-covered loans			24,769			19,563		17,167
	Stock-based compensation			3,811			2,724		2,400
	Deferred compensation			1,962			1,792		1,775
	Foreclosed assets			5,195			3,318		3,165
	Investment securities AFS			0			3,116		5,056
	Differences in amounts reflected in financial statements and income tax basis of assets acquired and liabilities assumed in FDIC-assisted acquisitions			8,708			607		3,424
	Acquired net operating losses			13,976			7,905		7,509
	Other, net			7,310			1,950		3,858
	Total gross deferred tax assets			84,783			57,055		60,930
	Less valuation allowance			(474	)		0		0
	Net deferred tax asset			84,309			57,055		60,930
	Deferred tax liabilities:
	Accelerated depreciation on premises and equipment			17,933			16,952		17,459
	Investment securities AFS			5,499			0		0
	Acquired intangible assets			10,466			4,390		4,227
	Total gross deferred tax liabilities			33,898			21,342		21,686
	Net deferred tax assets (liabilities)		$	50,411		$	35,713	$	39,244
	Net operating losses were acquired from the First National Bank, Bancshares and Summit transactions. The net operating losses acquired from the First National Bank transaction totaled $20.0 million, of which $12.5 million will expire in 2032 and $7.5 million will expire in 2033. The net operating losses acquired from the Bancshares transaction totaled $16.4 million, which will expire at various dates from 2030 through 2034. The net operating losses acquired from the Summit transaction totaled $6.5 million and will expire in 2019.
	As a result of recording, at fair value, acquired assets and assumed liabilities pursuant to business combinations, differences in amounts reported for financial statement purposes and their related basis for federal and state income tax purposes are created. Such differences are recorded as deferred tax assets and liabilities using enacted tax rates in effect for the year or years in which the differences are expected to be recovered or settled. Business combination transactions may result in the acquisition of net operating loss carryforwards and other assets with built-in losses, the realization of which are subject to section 382 limitations. In determining the section 382 limitation associated with a business combination, management must make a number of estimates and assumptions regarding the ability to utilize acquired net operating loss carryforwards and the expected timing of future recoveries or settlements of acquired assets with built-in losses. To the extent that information available as of the date of acquisition results in a determination by management that some portion of net operating loss carryforwards cannot be utilized or assets with built-in losses are expected to be settled or recovered in future periods in which the ability to realize the benefits will be subject to section 382 limitations, a deferred tax asset valuation allowance is established for the estimated amount of the deferred tax assets subject to the section 382 limitation. To the extent that information becomes available, during the first 12 months following the consummation of a business combination transaction, that results in changes in management’s initial estimates and assumptions regarding the expected utilization of net operating loss carryforwards or the expected settlement or recovery of acquired assets with built-in losses subject to section 382 limitations, an increase or decrease of the deferred tax asset valuation allowance will be recorded as an adjustment to bargain purchase gain or goodwill. To the extent that such information becomes available 12 months or more after the consummation of a business combination transaction, or additional information becomes available during the first 12 months as a result of changes in circumstances since the date of the consummation of a business combination transaction, an increase or decrease of the deferred tax asset valuation allowance will be recorded as an adjustment to deferred income tax expense (benefit).
	In connection with the acquisitions of First National Bank and Bancshares, management determined that net operating loss carryforwards and other assets with built-in losses are expected to be settled or otherwise recovered in future periods where the realization of such benefits would be subject to section 382 limitations. Accordingly, the Company had established a deferred tax asset valuation allowance of $4.1 million on the date of acquisition of First National Bank and $0.5 million on the date of acquisition of Bancshares, to reflect its initial assessment that the realization of the benefits from the settlement or recovery of certain of these acquired assets and net operating losses is expected to be subject to section 382 limitations.
	As disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013, the fair value adjustments and the resultant fair values for the First National Bank acquisition continued to be evaluated by management and could be subject to further adjustment. During the second quarter of 2014, management revised its initial estimates and assumptions regarding the expected recovery of acquired assets with built-in losses, specifically the timing of expected charge-offs of purchased non-covered loans, in the First National Bank acquisition. As a result of such revision, management concluded that the deferred tax asset valuation allowance of $4.1 million was not necessary. Because such revision occurred during the first 12 months following the date of acquisition and was not the result of changes in circumstances, management has recast the third quarter 2013 financial statements, along with all subsequent financial statements, to reflect this change in estimate.
	To the extent that additional information becomes available regarding the settlement or recovery of acquired net operating loss carryforwards or assets with built-in losses acquired in each of its acquisitions, management may be required to make adjustments to its deferred tax asset valuation allowance, which adjustments could affect bargain purchase gain, goodwill or deferred income tax expense (benefit).

Supplemental_Data_for_Cash_Flo

Supplemental Data for Cash Flows	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Data for Cash Flows	'
	8	Supplemental Data for Cash Flows
	The following table provides supplemental cash flow information for the periods indicated.
			Nine Months Ended
			September 30,
			2014		2013
			(Dollars in thousands)
	Cash paid during the period for:
	Interest		$	15,450	$	14,038
	Taxes			30,834		35,515
	Supplemental schedule of non-cash investing and financing activities:
	Net change in unrealized gains/losses on investment securities AFS			23,687		(18,488	)
	Loans and other assets transferred to foreclosed assets not covered by FDIC loss share agreements			9,112		4,497
	Loans advanced for sales of foreclosed assets not covered by FDIC loss share agreements			258		2,942
	Covered loans transferred to covered foreclosed assets			30,754		24,306
	Unsettled AFS investment security purchases			0		730
	Common stock issued in merger and acquisition transactions			166,402		60,079

Guarantees_and_Commitments

Guarantees and Commitments	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Guarantees and Commitments	'
	9	Guarantees and Commitments
	Outstanding standby letters of credit are contingent commitments issued by the Company generally to guarantee the performance of a customer in third party arrangements. The maximum amount of future payments the Company could be required to make under these guarantees at September 30, 2014 was $9.3 million. The Company holds collateral to support guarantees when deemed necessary. Collateralized commitments at September 30, 2014 totaled $9.1 million.
	At September 30, 2014 the Company had outstanding commitments to extend credit, excluding mortgage interest rate lock commitments, totaling $2.58 billion. While many of these commitments are expected to be disbursed within the next 12 months, the following table shows the contractual maturities of outstanding commitments to extend credit as of the date indicated.
	Contractual Maturities at September 30, 2014
	Maturity		Amount
	(Dollars in thousands)
	2014		$	89,808
	2015			209,595
	2016			492,517
	2017			1,259,690
	2018			485,222
	Thereafter			47,613
	Total		$	2,584,445

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Stock-Based Compensation	'
	10	Stock-Based Compensation
	The Company has a nonqualified stock option plan for certain employees of the Company. This plan provides for the granting of nonqualified options to purchase shares of common stock in the Company. No option may be granted under this plan for less than the fair market value of the common stock, defined by the plan as the average of the highest reported asked price and the lowest reported bid price, on the date of the grant. The benefits or amounts that may be received by or allocated to any particular officer or employee of the Company under this plan will be determined in the sole discretion of the Company’s board of directors or its personnel and compensation committee. While the vesting period and the termination date for the employee plan options are determined when options are granted, all such employee options outstanding at September 30, 2014 were issued with a vesting date three years after issuance and an expiration date seven years after issuance.
	The Company also has a nonqualified stock option plan for non-employee directors. This plan permits each director who is not otherwise an employee of the Company, or any subsidiary, to receive options to purchase 2,000 shares of the Company’s common stock on the day following his or her election as a director of the Company at each annual meeting of stockholders and up to 2,000 shares upon election or appointment for the first time as a director of the Company. No option may be granted under this plan for less than the fair market value of the common stock, defined by the plan as the average of the highest reported asked price and the lowest reported bid price, on the date of the grant. These options are exercisable immediately and expire ten years after issuance.
	All shares issued in connection with options exercised under both the employee and non-employee director stock option plans are in the form of newly issued shares.
	The following table summarizes stock option activity for both the employee and non-employee director stock option plans for the period indicated.
			Options			Weighted-		Weighted-Average		Aggregate
						Average		Remaining		Intrinsic
						Exercise		Contractual Life		Value
						Price/Share		(in years)		(in thousands)
	Nine Months Ended September 30, 2014:
	Outstanding – January 1, 2014			1,766,600		$	15.84
	Granted			52,000			29.05
	Exercised			(228,600	)		9.05
	Forfeited			(48,800	)		18.36
	Outstanding – September 30, 2014			1,541,200			17.21		5.2	$	22,058	(1)
	Fully vested and exercisable – September 30, 2014			305,600			13.65		5.2	$	5,460	(1)
	Expected to vest in future periods			989,280
	Fully vested and expected to vest – September 30, 2014(2)			1,294,880			17.04		5.2	$	18,744	(1)
	-1	Based on closing price of $31.52 per share on September 30, 2014.
	-2	At September 30, 2014 the Company estimated that outstanding options to purchase 246,320 shares of its common stock would not vest and would be forfeited prior to their vesting date.
	Intrinsic value for stock options is defined as the amount by which the current market price of the underlying stock exceeds the exercise price. For those stock options where the exercise price exceeds the current market price of the underlying stock, the intrinsic value is zero. The total intrinsic value of options exercised during the nine months ended September 30, 2014 and 2013 was $5.0 million and $4.7 million, respectively.
	Options to purchase 52,000 split-adjusted shares and 48,000 split-adjusted shares of the Company’s stock were issued during the nine months ended September 30, 2014 and 2013, respectively. Stock-based compensation expense for stock options included in non-interest expense was $0.4 million for both of the quarters ended September 30, 2014 and 2013 and $1.6 million and $1.3 million for the nine months ended September 30, 2014 and 2013, respectively. Total unrecognized compensation cost related to non-vested stock option grants was $2.2 million at September 30, 2014 and is expected to be recognized over a weighted-average period of 1.8 years.
	The Company has a restricted stock plan that permits issuance of up to 1,600,000 shares of restricted stock or restricted stock units. All officers and employees of the Company are eligible to receive awards under the restricted stock plan. The benefits or amounts that may be received by or allocated to any particular officer or employee of the Company under the restricted stock plan will be determined in the sole discretion of the Company’s board of directors or its personnel and compensation committee. Shares of common stock issued under the restricted stock plan may be shares of original issuance or shares held in treasury that have been reacquired by the Company. All restricted stock awards outstanding at September 30, 2014 were issued with a vesting date of three years after issuance.
	The following table summarizes non-vested restricted stock activity for the period indicated.
			Nine Months Ended
			September 30, 2014
	Outstanding – January 1, 2014			616,100
	Granted			0
	Forfeited			(1,200	)
	Vested			0
	Outstanding – September 30, 2014			614,900
	Weighted-average grant date fair value		$	17.99
	The fair value of the restricted stock awards is amortized to compensation expense over the vesting period and is based on the market price of the Company’s common stock at the date of grant multiplied by the number of shares granted that are expected to vest. Stock-based compensation expense for restricted stock included in non-interest expense was $0.9 million and $0.6 million for the quarters ended September 30, 2014 and 2013, respectively, and $2.8 million and $1.9 million for the nine months ended September 30, 2014 and 2013, respectively. Unrecognized compensation expense for non-vested restricted stock awards was $5.1 million at September 30, 2014 and is expected to be recognized over a weighted-average period of 1.8 years.

Fair_Value_Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value Measurements	'
	11	Fair Value Measurements
	The Company measures certain of its assets and liabilities on a fair value basis using various valuation techniques and assumptions, depending on the nature of the asset or liability. Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Additionally, fair value is used either annually or on a non-recurring basis to evaluate certain assets and liabilities for impairment or for disclosure purposes.
	The Company applies the following fair value hierarchy.
	Level 1		–		Quoted prices for identical instruments in active markets.
	Level 2		–		Quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable.
	Level 3		–		Instruments whose inputs are unobservable.
	The following table sets forth the Company’s assets, for the dates indicated, that are accounted for at fair value.
			Level 1			Level 2		Level 3		Total
			(Dollars in thousands)
	September 30, 2014:
	Investment securities AFS(1):
	Obligations of state and political subdivisions		$	0		$	568,021	$	19,558	$	587,579
	U.S. Government agency securities			0			254,062		0		254,062
	Corporate obligations			0			655		0		655
	Total investment securities AFS			0			822,738		19,558	$	842,296
	Impaired non-purchased loans and leases			0			0		14,835		14,835
	Impaired covered loans			0			0		13,634		13,634
	Impaired purchased non-covered loans			0			0		1,657		1,657
	Foreclosed assets not covered by FDIC loss share agreements			0			0		14,781		14,781
	Foreclosed assets covered by FDIC loss share agreements			0			0		27,882		27,882
	Total assets at fair value		$	0		$	822,738	$	92,347	$	915,085
	December 31, 2013:
	Investment securities AFS(1):
	Obligations of state and political subdivisions		$	0		$	417,307	$	18,682	$	435,989
	U.S. Government agency securities			0			218,869		0		218,869
	Corporate obligations			0			716		0		716
	Total investment securities AFS			0			636,892		18,682		655,574
	Impaired non-purchased loans and leases			0			0		6,746		6,746
	Impaired covered loans			0			0		46,179		46,179
	Foreclosed assets not covered by FDIC loss share agreements			0			0		11,851		11,851
	Foreclosed assets covered by FDIC loss share agreements			0			0		37,960		37,960
	Total assets at fair value		$	0		$	636,892	$	121,418	$	758,310
	September 30, 2013:
	Investment securities AFS(1):
	Obligations of state and political subdivisions		$	0		$	412,770	$	18,798	$	431,568
	U.S. Government agency securities			0			225,311		0		225,311
	Corporate obligations			0			717		0		717
	Total investment securities AFS			0			638,798		18,798		657,596
	Impaired non-purchased loans and leases			0			0		8,074		8,074
	Impaired covered loans			0			0		52,575		52,575
	Foreclosed assets not covered by FDIC loss share agreements			0			0		11,647		11,647
	Foreclosed assets covered by FDIC loss share agreements			0			0		40,452		40,452
	Total assets at fair value		$	0		$	638,798	$	131,546	$	770,344
	-1	Does not include $17.6 million at September 30, 2014; $13.8 million at December 31, 2013 and $13.8 million at September 30, 2013 of FHLB – Dallas and FNBB stock that do not have readily determinable fair values and are carried at cost.
	The following table presents information related to Level 3 non-recurring fair value measurements as of the date indicated.
	Description		Fair Value at		Technique	Unobservable Inputs
			September 30, 2014
	(Dollars in thousands)
	Impaired non-purchased loans and leases		$14,835		Third party appraisal(1) or discounted cash flows	1. Management discount based on underlying collateral characteristics and market conditions
						2. Life of loan
	Impaired covered loans		$13,634		Third party appraisal(1) and/or discounted cash flows	1. Management discount based on underlying collateral characteristics and market conditions
						2. Life of loan
						3. Discount rate
	Impaired purchased non-covered loans		$1,657		Third party appraisal(1) and/or discounted cash flows	1. Management discount based on underlying collateral characteristics and market conditions
						2. Discount rate
						3. Holding period
	Foreclosed assets not covered by FDIC loss share agreements		$14,781		Third party appraisal,(1) broker price opinions and/or discounted cash flows	1. Management discount based on asset characteristics and market conditions
						2. Discount rate
						3. Holding period
	Foreclosed assets covered by FDIC loss share agreements		$27,882		Third party appraisal,(1) broker price opinions and/or discounted cash flows	1. Management discount based on asset characteristics and market conditions
						2. Discount rate
						3. Holding period
	-1	The Company utilizes valuation techniques consistent with the market, cost, and income approaches, or a combination thereof in determining fair value.
The following methods and assumptions are used to estimate the fair value of the Company’s assets and liabilities that are accounted for at fair value.
Investment securities – The Company utilizes independent third parties as its principal pricing sources for determining fair value of investment securities which are measured on a recurring basis. As a result, the Company receives estimates of fair values from at least two independent pricing sources for the majority of its individual securities within its investment portfolio. For investment securities traded in an active market, fair values are based on quoted market prices if available. If quoted market prices are not available, fair values are based on quoted market prices of comparable securities, broker quotes, comprehensive interest rate tables and pricing matrices or a combination thereof. For investment securities traded in a market that is not active, fair value is determined using unobservable inputs. All fair value estimates of the Company’s investment securities are reviewed and approved on a quarterly basis by the Company’s Investment Portfolio Manager and its Chief Financial Officer.
The Company has determined that certain of its investment securities had a limited to non-existent trading market at September 30, 2014. As a result, the Company considers these investments as Level 3 in the fair value hierarchy. Specifically, the fair values of certain obligations of state and political subdivisions consisting primarily of certain unrated private placement bonds (the “private placement bonds”) in the amount of $19.6 million at September 30, 2014 were calculated using Level 3 hierarchy inputs and assumptions as the trading market for such securities was determined to be “not active.” This determination was based on the limited number of trades or, in certain cases, the existence of no reported trades for the private placement bonds. The private placement bonds are generally prepayable at par value at the option of the issuer. As a result, management believes the private placement bonds should be individually valued at the lower of (i) the matrix pricing provided by the Company’s third party pricing services for comparable unrated municipal securities or (ii) par value. At September 30, 2014, the third parties’ pricing matrices valued the Company’s portfolio of private placement bonds at $19.6 million which was equal to the aggregate par value of the private placement bonds. Accordingly, at September 30, 2014, the Company reported the private placement bonds at $19.6 million.
Impaired non-purchased loans and leases – Fair values are measured on a nonrecurring basis and are based on the underlying collateral value of the impaired loan or lease, net of holding and selling costs, or the estimated discounted cash flows for such loan or lease. At September 30, 2014 the Company had reduced the carrying value of its impaired non-purchased loans and leases (all of which are included in nonaccrual loans and leases) by $5.4 million to the estimated fair value of $14.8 million. The $5.4 million adjustment to reduce the carrying value of impaired non-purchased loans and leases to estimated fair value consisted of $4.4 million of partial charge-offs and $1.0 million of specific loan and lease loss allocations.
Impaired covered loans – Impaired covered loans are measured at fair value on a non-recurring basis. In determining such fair value, management considers a number of factors including, among other things, the remaining life of the loan, estimated collateral value, estimated holding period and net present value of cash flows expected to be received. As a result, impaired covered loans include both a non-accretable difference (the credit component of the impaired loan) and an accretable difference (the yield component of the impaired loan). The non-accretable difference is the difference between the contractually required payments and the cash flows expected to be collected in accordance with management’s determination of the Day 1 Fair Values. The accretable difference is the difference between the expected cash flows and the net present value of expected cash flows and is accreted into earnings using the effective yield method. In determining the net present value of expected cash flows, the Company used discount rates ranging from 6.0% to 9.5% per annum. As of September 30, 2014, the Company identified purchased loans covered by FDIC loss share agreements acquired in its FDIC-assisted acquisitions where the expected performance of such loans had deteriorated from management’s performance expectations established in conjunction with the determination of the Day 1 Fair Values. As a result the Company recorded partial charge-offs, net of adjustments to the FDIC loss share receivable and the FDIC clawback payable, totaling $0.2 million during the third quarter and $0.9 million during the first nine months of 2014 for such loans. The Company also recorded provision for loan and lease losses of $0.2 million during the third quarter and $0.9 million during the first nine months of 2014 to cover such charge-offs. At September 30, 2014, the Company had $13.6 million of impaired covered loans.
Impaired purchased non-covered loans – Impaired purchased non-covered loans are measured at fair value on a non-recurring basis. In determining the Day 1 Fair Values of purchased non-covered loans without evidence of credit deterioration at the date of acquisition, management includes an adjustment of the unpaid principal balance to reflect an appropriate market rate of interest, given the risk profile and grade assigned to each loan. In determining the estimated fair value of purchased non-covered loans with evidence of credit deterioration, management considers a number of factors including, among other things, the remaining life of the acquired loans, estimated prepayments, estimated loss ratios, estimated value of the underlying collateral, estimated holding periods, and net present value of cash flows expected to be received. In determining the Day 1 Fair Values of purchased non-covered loans with evidence of credit deterioration, management calculates a non-accretable difference (the credit component of the purchased loans) and an accretable difference (the yield component of the purchased loans). The non-accretable difference is the difference between the contractually required payments and the cash flows expected to be collected in accordance with management’s determination of the Day 1 Fair Values. The accretable difference on purchased non-covered loans with evidence of credit deterioration is the difference between the expected cash flows and the net present value of expected cash flows. In determining the net present value of the expected cash flows for purposes of establishing the Day 1 Fair Values, the Company used discount rates ranging from 6.0% to 9.5% per annum depending on the risk characteristics of each individual loan.
As of September 30, 2014, the Company had identified purchased non-covered loans where the expected performance had deteriorated from management’s performance expectations established in conjunction with the determination of the Day 1 Fair Values or where current information indicates it is probable that the Company will not be able to collect all amounts according to the contractual terms thereon. As a result, the Company recorded partial charge-offs totaling $0.3 million during the third quarter and $0.9 million during the first nine months of 2014. The Company also recorded provision for loan and lease losses of $0.3 million during the third quarter and $0.9 million during the first nine months of 2014 to cover such charge-offs. At September 30, 2014, the Company had $1.7 million of impaired purchased non-covered loans.
Foreclosed assets not covered by FDIC loss share agreements – Repossessed personal properties and real estate acquired through or in lieu of foreclosure are measured on a non-recurring basis and are initially recorded at the lesser of current principal investment or fair value less estimated cost to sell (generally 8% to 10%) at the date of repossession or foreclosure. Valuations of these assets are periodically reviewed by management with the carrying value of such assets adjusted to the then estimated fair value net of estimated selling costs, if lower, until disposition. Fair values of foreclosed and repossessed assets are generally based on third party appraisals, broker price opinions or other valuations of the property.
Foreclosed assets covered by FDIC loss share agreements – Foreclosed assets covered by FDIC loss share agreements, or covered foreclosed assets are initially recorded at Day 1 Fair Values. In estimating the Day 1 Fair Values of covered foreclosed assets, management considers a number of factors including, among others, appraised value, estimated selling prices, estimated holding periods and net present value of cash flows expected to be received. Discount rates ranging from 8.0% to 9.5% per annum were used to determine the net present value of covered foreclosed assets for purposes of establishing the Day 1 Fair Values. Valuations of these assets are periodically reviewed by management with the carrying value of such assets adjusted through non-interest income to the then estimated fair value net of estimated selling costs, if lower, until disposition. Fair values of foreclosed assets held for sale are generally based on third party appraisals, broker price opinions or other valuations of property, resulting in a Level 3 classification.
The following table presents additional information for the periods indicated about assets measured at fair value on a recurring basis and for which the Company has utilized Level 3 inputs to determine fair value.
		Investment
		Securities AFS
		(Dollars in thousands)
Balance – January 1, 2014		$	18,682
Total realized gains (losses) included in earnings			0
Total unrealized gains (losses) included in comprehensive income			497
Acquired			1,907
Paydowns and maturities			(672	)
Sales			(856	)
Transfers in and/or out of Level 3			0
Balance – September 30, 2014		$	19,558
Balance – January 1, 2013		$	104,172
Total realized gains (losses) included in earnings			0
Total unrealized gains (losses) included in comprehensive income			(1,940	)
Paydowns and maturities			(32,647	)
Sales			0
Transfers in and/or out of Level 3			(50,787	)
Balance –September 30, 2013		$	18,798

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Fair Value of Financial Instruments	'
	12	Fair Value of Financial Instruments
	The following methods and assumptions were used to estimate the fair value of financial instruments.
	Cash and due from banks – For these short-term instruments, the carrying amount is a reasonable estimate of fair value.
	Investment securities – The Company utilizes independent third parties as its principal pricing sources for determining fair value of investment securities which are measured on a recurring basis. As a result, the Company receives estimates of fair values from at least two independent pricing sources for the majority of its individual securities within its investment portfolio. For investment securities traded in an active market, fair values are based on quoted market prices if available. If quoted market prices are not available, fair values are based on quoted market prices of comparable securities, broker quotes, comprehensive interest rate tables, pricing matrices or a combination thereof. For investment securities traded in a market that is not active, fair value is determined using unobservable inputs. All fair value estimates of the Company’s investment securities are reviewed and approved on a quarterly basis by the Company’s Investment Portfolio Manager and its Chief Financial Officer. The Company’s investments in the common stock of the FHLB – Dallas and FNBB totaling $17.6 million at September 30, 2014, $13.8 million at December 31, 2013 and $13.8 million at September 30, 2013, do not have readily determinable fair values and are carried at cost.
	Loans and leases – The fair value of loans and leases, including covered loans and purchased non-covered loans, is estimated by discounting the contractual cash flows to be received in future periods using the current rate at which similar loans or leases would be made to borrowers or lessees with similar credit ratings and for the same remaining maturities.
	FDIC loss share receivable – The fair value of the FDIC loss share receivable is based on the net present value of future cash proceeds expected to be received from the FDIC under the provisions of the loss share agreements using a discount rate that is based on current market rates.
	Deposit liabilities – The fair value of demand deposits, savings accounts, money market deposits and other transaction accounts is the amount payable on demand at the reporting date. The fair value of fixed maturity time deposits is estimated using the rate currently available for deposits of similar remaining maturities.
	Repurchase agreements – For these short-term instruments, the carrying amount is a reasonable estimate of fair value.
	Other borrowed funds – For these short-term instruments, the carrying amount is a reasonable estimate of fair value. The fair value of long-term instruments is estimated based on the current rates available to the Company for borrowings with similar terms and remaining maturities.
	Clawback payable – The fair value of the FDIC clawback payable is based on the net present value of future cash payments expected to be remitted to the FDIC in accordance with the provisions of the loss share agreements using a discount rate that is based on current market rates.
	Subordinated debentures – The fair values of these instruments are based primarily upon discounted cash flows using rates for securities with similar terms and remaining maturities.
	Off-balance sheet instruments – The fair values of commercial loan commitments and letters of credit are based on fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements, and were not material at September 30, 2014 and 2013 or at December 31, 2013.
	The fair values of certain of these instruments were calculated by discounting expected cash flows, which contain numerous uncertainties and involve significant judgments by management. Fair value is the estimated amount at which financial assets or liabilities could be exchanged in a current transaction between willing parties other than in a forced or liquidation sale. Because no market exists for certain of these financial instruments and because management does not intend to sell these financial instruments, the Company does not know whether the fair values represent values at which the respective financial instruments could be sold individually or in the aggregate.
	The following table presents the carrying amounts and estimated fair values for the dates indicated and the fair value hierarchy of the Company’s financial instruments.
				September 30,
				2014				2013				December 31, 2013
			Fair	Carrying		Estimated		Carrying		Estimated		Carrying		Estimated
			Value	Amount		Fair		Amount		Fair		Amount		Fair
			Hierarchy			Value				Value				Value
				(Dollars in thousands)
	Financial assets:
	Cash and cash equivalents		Level 1	$	112,084	$	112,084	$	124,458	$	124,458	$	195,975	$	195,975
	Investment securities AFS		Levels 2 and 3		859,876		859,876		671,393		671,393		669,384		669,384
	Loans and leases, net of ALLL		Level 3		4,869,329		4,822,383		3,289,306		3,263,428		3,314,134		3,286,600
	FDIC loss share receivable		Level 3		36,583		36,130		89,642		89,617		71,854		71,770
	Financial liabilities:
	Demand, savings and interest bearing transaction deposits		Level 1	$	3,877,373	$	3,877,373	$	2,677,030	$	2,677,030	$	2,819,817	$	2,819,817
	Time deposits		Level 2		1,262,332		1,263,635		977,656		978,202		897,210		897,708
	Repurchase agreements with customers		Level 1		73,942		73,942		50,254		50,254		53,103		53,103
	Other borrowings		Level 2		352,616		373,696		280,905		322,171		280,895		319,650
	FDIC clawback payable		Level 3		26,676		26,676		25,705		25,705		25,897		25,897
	Subordinated debentures		Level 2		64,950		33,452		64,950		30,815		64,950		30,974

Changes_In_and_Reclassificatio

Changes In and Reclassifications From Accumulated Other Comprehensive Income ("AOCI")	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Changes In and Reclassifications From Accumulated Other Comprehensive Income ("AOCI")	'
	13	Changes In and Reclassifications From Accumulated Other Comprehensive Income (“AOCI”)
	The following table presents changes in AOCI for the dates indicated.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
			(Dollars in thousands)
	Beginning balance of AOCI – unrealized gains and losses on investment securities AFS		$	10,006		$	(898	)	$	(3,672	)	$	10,783
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications			744			445			14,437			(11,142	)
	Amounts reclassified from AOCI			(26	)		0			(41	)		(94	)
	Total other comprehensive income (loss)			718			445			14,396			(11,236	)
	Ending balance of AOCI – unrealized gains and losses on investment securities AFS		$	10,724		$	(453	)	$	10,724		$	(453	)
	Amounts reclassified from AOCI to net gains on investment securities in the consolidated statements of income related entirely to unrealized gains/losses on investment securities AFS. For the three months ended September 30, 2014, amounts reclassified for net gains on investment securities were $43,000, with related tax effects of $17,000. For the three months ended September 30, 2013, there were no amounts reclassified from AOCI. For the nine months ended September 30, 2014 and 2013 amounts reclassified for net gains on investment securities were $67,000 and $156,000, respectively, with tax related tax effects of $26,000 and $62,000, respectively.

Recent_Accounting_Pronouncemen

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2014
Accounting Changes and Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	14	Recent Accounting Pronouncements
	In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-04 “Receivables – Troubled Debt Restructurings by Creditors (Sub topic 310-04) Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure.” The provisions of this ASU clarify when an in substance foreclosure occurs and require a creditor to reclassify a collateralized consumer mortgage loan to real estate owned upon obtaining legal title to the real estate collateral, or a deed in lieu of foreclosure, or similar legal agreement that is voluntarily provided by the borrower to satisfy the loan. ASU 2014-04 was effective for reporting periods beginning January 1, 2014. The provisions of ASU 2014-04 did not have a material impact on the Company’s financial position, results of operations, or liquidity.
	In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers.” ASU 2014-09 provides guidance 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 and services. ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2016. The Company is currently evaluating the impact, if any, ASU 2014-09 will have on its financial position, results of operations, and its financial statement disclosures.

Recent_Accounting_Pronouncemen1

Recent Accounting Pronouncements (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Changes and Error Corrections [Abstract]	'
Recent Accounting Pronouncements	'
	In January 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-04 “Receivables – Troubled Debt Restructurings by Creditors (Sub topic 310-04) Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans Upon Foreclosure.” The provisions of this ASU clarify when an in substance foreclosure occurs and require a creditor to reclassify a collateralized consumer mortgage loan to real estate owned upon obtaining legal title to the real estate collateral, or a deed in lieu of foreclosure, or similar legal agreement that is voluntarily provided by the borrower to satisfy the loan. ASU 2014-04 was effective for reporting periods beginning January 1, 2014. The provisions of ASU 2014-04 did not have a material impact on the Company’s financial position, results of operations, or liquidity.
	In May 2014, the FASB issued ASU 2014-09 “Revenue from Contracts with Customers.” ASU 2014-09 provides guidance 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 and services. ASU 2014-09 is effective for annual and interim periods beginning after December 15, 2016. The Company is currently evaluating the impact, if any, ASU 2014-09 will have on its financial position, results of operations, and its financial statement disclosures.

Acquisitions_Tables

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2014
Business Combinations [Abstract]	'
Summary of Assets Acquired and Liabilities Assumed in Acquisition	'
	The following table provides a summary of the assets acquired and liabilities assumed as recorded by Summit, the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value, and the resultant fair values of those assets and liabilities as recorded by the Company. As provided for under GAAP, management has up to 12 months following the date of acquisition to finalize the fair values of the acquired assets and assumed liabilities. The fair value adjustments and the resultant fair values shown in the following table continue to be evaluated by management and may be subject to further adjustment.
		May 16, 2014
		As Recorded by			Fair Value					As Recorded
		Summit			Adjustments					by the
										Company
		(Dollars in thousands)
	Assets acquired:
	Cash, due from banks and interest earning deposits	$	84,106		$	(304	)		a	$	83,802
	Investment securities		242,149			765			b		242,914
	Loans and leases		742,546			(24,718	)		c		717,828
	Allowance for loan losses		(13,183	)		13,183			c		0
	Premises and equipment		13,773			(1,108	)		d		12,665
	Foreclosed assets		3,094			(1,088	)		e		2,006
	Accrued interest receivable and other assets		11,016			1,461			f		12,477
	Bank owned life insurance		33,398			0					33,398
	Core deposit intangible asset		0			15,340			g		15,340
	Deferred income taxes		3,878			953			h		4,831
	Total assets acquired		1,120,777			4,484					1,125,261
	Liabilities assumed:
	Deposits		965,687			4,074			i		969,761
	Repurchase agreements with customers		16,515			0					16,515
	Accrued interest payable and other liabilities		2,352			1,206			j		3,558
	Total liabilities assumed		984,554			5,280					989,834
	Net assets acquired	$	136,223		$	(796	)				135,427
	Consideration paid:
	Cash										42,451
	Stock										166,402
	Total consideration paid										208,853
	Goodwill									$	73,426
	Explanation of fair value adjustments
	a-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of acquired interest earning deposits.
	b-	Adjustment reflects the fair value adjustment based on the Company’s pricing of the acquired investment securities portfolio.
	c-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired loan portfolio and to eliminate the recorded allowance for loan losses.
	d-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the premises and equipment acquired.
	e-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired foreclosed assets.
	f-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of accrued interest receivable and other assets.
	g-	Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.
	h-	This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes.
	i-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired deposits.
	j-	Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of Summit.
	The following table provides a summary of the assets acquired and liabilities assumed as recorded by Bancshares, the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value, and the resultant fair values of those assets and liabilities as recorded by the Company. As provided for under GAAP, management has up to 12 months following the date of acquisition to finalize the fair values of the acquired assets and assumed liabilities. The fair value adjustments and the resultant fair values shown in the following table continue to be evaluated by management and may be subject to further adjustment.
		March 5, 2014
		As Recorded by			Fair Value					As Recorded
		Bancshares			Adjustments					by the
										Company
		(Dollars in thousands)
	Assets acquired:
	Cash and due from banks	$	102,156		$	0				$	102,156
	Investment securities		1,860			(1	)		a		1,859
	Loans and leases		165,939			(10,764	)		b		155,175
	Allowance for loan losses		(5,280	)		5,280			b		0
	Premises and equipment		6,259			1,619			c		7,878
	Foreclosed assets		7,634			(2,916	)		d		4,718
	Accrued interest receivable and other assets		608			(294	)		e		314
	Core deposit intangible asset		0			2,648			f		2,648
	Deferred income taxes		7,110			1,881			g		8,991
	Total assets acquired		286,286			(2,547	)				283,739
	Liabilities assumed:
	Deposits		255,798			121			h		255,919
	Accrued interest payable and other liabilities		1,358			295			i		1,653
	Total liabilities assumed		257,156			416					257,572
	Net assets acquired	$	29,130		$	(2,963	)				26,167
	Total cash consideration paid										(21,500	)
Gain on acquisition									$	4,667
Explanation of fair value adjustments
a-	Adjustment reflects the fair value adjustment based on the Company’s pricing of the acquired investment securities portfolio.
b-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired loan portfolio and to eliminate the recorded allowance for loan losses.
c-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the premises and equipment acquired.
d-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired foreclosed assets.
e-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of accrued interest receivable and other assets.
f-	Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.
g-	This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes. Management has determined that acquired net operating loss carryforwards are expected to be settled in future periods where the realization of such benefits would be subject to limitations under section 382 of the Internal Revenue Code (“section 382 limitations”). Accordingly, as of the date of acquisition, the Company had established a deferred tax asset valuation allowance of approximately $0.5 million to reflect its assessment that the realization of the benefits from the settlement of these acquired net operating losses is expected to be subject to section 382 limitations. To the extent that additional information becomes available, management may be required to adjust its estimates and assumptions regarding the realization of the benefits associated with these acquired net operating losses by adjusting this deferred tax asset valuation allowance.
h-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired deposits.
i-	Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of Bancshares.
The following table provides a summary of the assets acquired and liabilities assumed as recorded by First National Bank, the fair value adjustments necessary to adjust those acquired assets and assumed liabilities to estimated fair value, the recast adjustment described above and the resultant fair values of those assets and liabilities as recorded by the Company.
	July 31, 2013
	As Recorded			Fair Value					Recast			As Recorded
	by First			Adjustments					Adjustment			by the
	National Bank											Company
	(Dollars in thousands)
Assets acquired:
Cash and due from banks	$	69,285		$	0				$	0		$	69,285
Investment securities		149,943			(599	)		a		0			149,344
Loans and leases		432,250			(44,183	)		b		0			388,067
Allowance for loan losses		(13,931	)		13,931			b		0			0
Premises and equipment		14,318			5,064			c		0			19,382
Foreclosed assets		3,073			(915	)		d		0			2,158
Accrued interest receivable		1,234			(110	)		e		0			1,124
BOLI		14,812			0					0			14,812
Core deposit intangible asset		0			10,136			f		0			10,136
Deferred income taxes		12,179			12,325			g		4,102			28,606
Other assets		4,277			(251	)		e		0			4,026
Total assets acquired		687,440			(4,602	)				4,102			686,940
Liabilities assumed:
Deposits		595,668			4,950			h		0			600,618
Repurchase agreements with customers		6,405			0					0			6,405
Accrued interest payable and other		1,296			1,164			i		0			2,460
liabilities
Total liabilities assumed		603,369			6,114					0			609,483
Net assets acquired	$	84,071		$	(10,716	)			$	4,102			77,457
Consideration paid:
Cash													(12,215	)
Common stock													(60,079	)
Total consideration paid													(72,294	)
Gain on acquisition												$	5,163
Explanation of fair value adjustments
a-	Adjustment reflects the fair value adjustment based on the Company’s pricing of the acquired investment securities portfolio.
b-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired loan portfolio and to eliminate the
	recorded allowance for loan losses.
c-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the premises and equipment acquired.
d-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired foreclosed assets.
e-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of accrued interest receivable and other assets.
f-	Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.
g-	This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes. Management initially determined that acquired net operating loss carryforwards and other acquired assets with built-in losses were expected to be settled or otherwise recovered in future periods where the realization of such benefits would be subject to section 382 limitations. Accordingly, at the date of acquisition, the Company established a deferred tax asset valuation allowance of approximately $4.1 million to reflect its initial assessment that the realization of the benefits from the settlement or recovery of certain of these acquired assets and net operating losses was expected to be subject to section 382 limitations. During the second quarter of 2014, management determined such valuation allowance was not necessary. Accordingly, the Company’s acquisition of
	First National Bank has been recast to reflect such determination.
h-	Adjustment reflects the fair value adjustment based on the Company’s evaluation of the acquired deposits.
i-	Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of First National Bank.
Summary of Supplemental Pro-forma Information	'
	The following unaudited supplemental pro forma information is presented to show the estimated results assuming Summit was acquired as of the beginning of each period presented, adjusted for estimated potential costs savings. These unaudited pro forma results are not necessarily indicative of the operating results that the Company would have achieved had it completed the acquisition as of January 1, 2013 or 2014 and should not be considered as representative of future operating results.
		Nine Months Ended
		September 30,
		2014			2013
		(Dollars in thousands,
		except per share amounts)
	Net interest income – pro forma (unaudited)	$	208,758		$	171,824
	Net income – pro forma (unaudited)	$	91,402		$	81,787
	Diluted earnings per common share – pro forma (unaudited)	$	1.14		$	1.05
Summary of Financial Statement Captions Impacted by Recast Adjustments	'
	The following is a summary of those financial statement captions that have been impacted by this recast adjustment.
		As Previously			Recast			As Recast
		Reported			Adjustment
		(Dollars in thousands, except per share amounts)
	September 30, 2013:
	Deferred income tax asset valuation allowance	$	(4,102	)	$	4,102		$	0
	Total stockholders’ equity before noncontrolling interest		608,236			4,102			612,338
	Gain on merger and acquisition transaction		1,061			4,102			5,163
	Net income available to common stockholders		62,737			4,102			66,839
	Diluted earnings per common share, split adjusted	$	0.87		$	0.06		$	0.93

Earnings_Per_Common_Share_EPS_

Earnings Per Common Share ("EPS") (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Schedule of Calculation of Numerator and Denominator in Basic and Diluted Earnings Per Share	'
	The following table presents the computation of basic and diluted EPS for the periods indicated.
		Three Months Ended				Nine Months Ended
		September 30,				September 30,
		2014		2013		2014		2013
		(In thousands, except per share amounts)
	Numerator:
	Distributed earnings allocated to common stock	$	9,560	$	6,732	$	26,166	$	18,036
	Undistributed earnings allocated to common stock		22,533		19,720		57,689		48,803
	Net income available to common stock	$	32,093	$	26,452	$	83,855	$	66,839
	Denominator:
	Denominator for basic EPS – weighted-average common shares		79,678		72,544		76,763		71,338
	Effect of dilutive securities – stock options		767		752		706		650
	Denominator for diluted EPS – weighted-average common shares and assumed conversions		80,445		73,296		77,469		71,988
	Basic EPS	$	0.4	$	0.36	$	1.09	$	0.94
	Diluted EPS	$	0.4	$	0.36	$	1.08	$	0.93

Investment_Securities_Tables

Investment Securities (Tables)	9 Months Ended
	Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]	'
Summary of Amortized Cost and Estimated Fair Values of Investment Securities	'
	The following table presents the amortized cost and estimated fair value of investment securities AFS as of the dates indicated. The Company’s holdings of “other equity securities” include Federal Home Loan Bank of Dallas (“FHLB – Dallas”) and First National Banker’s Bankshares, Inc. (“FNBB”) shares, which do not have readily determinable fair values and are carried at cost.
		Amortized			Gross		Gross			Estimated
		Cost			Unrealized		Unrealized			Fair Value
					Gains		Losses
		(Dollars in thousands)
	September 30, 2014:
	Obligations of state and political subdivisions	$	572,070		$	16,610	$	(1,101	)	$	587,579
	U.S. Government agency securities		251,926			4,427		(2,291	)		254,062
	Corporate obligations		655			0		0			655
	Other equity securities		17,580			0		0			17,580
	Total	$	842,231		$	21,037	$	(3,392	)	$	859,876
	December 31, 2013:
	Obligations of state and political subdivisions	$	438,390		$	6,230	$	(8,631	)	$	435,989
	U.S. Government agency securities		222,510			2,352		(5,993	)		218,869
	Corporate obligations		716			0		0			716
	Other equity securities		13,810			0		0			13,810
	Total	$	675,426		$	8,582	$	(14,624	)	$	669,384
	September 30, 2013:
	Obligations of state and political subdivisions	$	432,362		$	7,423	$	(8,217	)	$	431,568
	U.S. Government agency securities		225,263			4,077		(4,029	)		225,311
	Corporate obligations		717			0		0			717
	Other equity securities		13,797			0		0			13,797
	Total	$	672,139		$	11,500	$	(12,246	)	$	671,393
Gross Unrealized Losses and Estimated Fair Value of Investment Securities	'
	The following table shows estimated fair value of investment securities AFS having gross unrealized losses and the amount of such unrealized losses, aggregated by investment category and length of time that individual investment securities have been in a continuous unrealized loss position, as of the dates indicated.
		Less than 12 Months					12 Months or More					Total
		Estimated			Unrealized		Estimated			Unrealized		Estimated		Unrealized
		Fair Value			Losses		Fair Value			Losses		Fair Value		Losses
		(Dollars in thousands)
	September 30, 2014:
	Obligations of state and political subdivisions	$	40,386		$	146	$	53,628		$	955	$	94,014	$	1,101
	U.S. Government agency securities		44,958			226		57,610			2,065		102,568		2,291
	Total temporarily impaired securities	$	85,344		$	372	$	111,238		$	3,020	$	196,582	$	3,392
	December 31, 2013:
	Obligations of states and political subdivisions	$	132,568		$	7,237	$	10,823		$	1,394	$	143,391	$	8,631
	U.S. Government agency securities		127,274			5,993		0			0		127,274		5,993
	Total temporarily impaired securities	$	259,842		$	13,230	$	10,823		$	1,394	$	270,665	$	14,624
	September 30, 2013:
	Obligations of state and political subdivisions	$	122,614		$	7,523	$	8,020		$	694	$	130,634	$	8,217
	U.S. Government agency securities		60,861			4,029		0			0		60,861		4,029
	Total temporarily impaired securities	$	183,475		$	11,552	$	8,020		$	694	$	191,495	$	12,246
Maturity Distribution of Investment Securities AFS Reported at Amortized Cost and Estimated Fair Value	'
	The following table shows the amortized cost and estimated fair value of investment securities AFS by maturity or estimated date of repayment as of the date indicated.
		September 30, 2014
	Maturity or	Amortized			Estimated
	Estimated Repayment	Cost			Fair Value
		(Dollars in thousands)
	One year or less	$	37,664		$	38,291
	After one year to five years		138,870			140,563
	After five years to ten years		194,325			196,655
	After ten years		471,372			484,367
	Total	$	842,231		$	859,876
Sales Activities of Company's Investment Securities AFS are Summarized	'
	The following table is a summary of sales activities in the Company’s investment securities AFS for the periods indicated.
		Three Months					Nine Months Ended
		Ended					September 30,
		September 30,
		2014			2013		2014			2013
		(Dollars in thousands)
	Sales proceeds	$	6,563		$	0	$	54,957		$	999
	Gross realized gains	$	58		$	0	$	82		$	156
	Gross realized losses		(15	)		0		(15	)		0
	Net gains on investment securities	$	43		$	0	$	67		$	156

Allowance_for_Loan_and_Lease_L1

Allowance for Loan and Lease Losses ("ALLL") and Credit Quality Indicators (Tables)	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Schedule of Activity Within Allowance for Loan and Lease Losses	'
	The following table is a summary of activity within the ALLL for the periods indicated.
			Three Months Ended						Nine Months Ended
			September 30,						September 30,
			2014			2013			2014			2013
			(Dollars in thousands)
	Beginning balance		$	46,958		$	39,372		$	42,945		$	38,738
	Non-purchased loans and leases charged off			(737	)		(754	)		(3,306	)		(3,203	)
	Recoveries of non-purchased loans and leases previously charged off			185			142			1,167			925
	Net non-purchased loans and leases charged off			(552	)		(612	)		(2,139	)		(2,278	)
	Covered loans charged off			(205	)		(918	)		(925	)		(4,012	)
	Purchased non-covered loans charged off			(282	)		0			(849	)		0
	Net charge-offs – total loans and leases			(1,039	)		(1,530	)		(3,913	)		(6,290	)
	Provision for loan and lease losses:
	Non-purchased loans and leases			3,200			2,900			8,800			5,200
	Covered loans			205			918			925			4,012
	Purchased non-covered loans			282			0			849			0
	Total provision			3,687			3,818			10,574			9,212
	Ending balance		$	49,606		$	41,660		$	49,606		$	41,660
Summary of Company's Allowance for Loan and Lease Losses	'
	The following table is a summary of the Company’s ALLL for the periods indicated.
			Beginning			Charge-offs			Recoveries			Provision			Ending
			Balance												Balance
			(Dollars in thousands)
	Three months ended September 30, 2014:
	Real estate:
	Residential 1-4 family		$	4,760		$	(115	)	$	47		$	610		$	5,302
	Non-farm/non-residential			14,836			(90	)		15			3,267			18,028
	Construction/land development			15,464			0			4			(950	)		14,518
	Agricultural			2,908			(198	)		2			(98	)		2,614
	Multifamily residential			1,772			0			0			(161	)		1,611
	Commercial and industrial			2,848			(55	)		38			108			2,939
	Consumer			926			(29	)		14			(89	)		822
	Direct financing leases			2,572			(151	)		29			371			2,821
	Other			872			(99	)		36			142			951
	Covered loans			0			(205	)		0			205			0
	Purchased non-covered loans			0			(282	)		0			282			0
	Total		$	46,958		$	(1,224	)	$	185		$	3,687		$	49,606
	Nine months ended September 30, 2014:
	Real estate:
	Residential 1-4 family		$	4,701		$	(456	)	$	118		$	939		$	5,302
	Non-farm/non-residential			13,633			(1,344	)		19			5,720			18,028
	Construction/land development			12,306			(14	)		12			2,214			14,518
	Agricultural			3,000			(213	)		13			(186	)		2,614
	Multifamily residential			2,504			0			0			(893	)		1,611
	Commercial and industrial			2,855			(477	)		801			(240	)		2,939
	Consumer			917			(126	)		50			(19	)		822
	Direct financing leases			2,266			(418	)		43			930			2,821
	Other			763			(258	)		111			335			951
	Covered loans			0			(925	)		0			925			0
	Purchased non-covered loans			0			(849	)		0			849			0
	Total		$	42,945		$	(5,080	)	$	1,167		$	10,574		$	49,606
	The following table is a summary of the Company’s ALLL for the periods indicated.
			Beginning			Charge-offs			Recoveries			Provision			Ending
			Balance												Balance
			(Dollars in thousands)
	Year ended December 31, 2013:
	Real estate:
	Residential 1-4 family		$	4,820		$	(837	)	$	106		$	612		$	4,701
	Non-farm/non-residential			10,107			(1,111	)		122			4,515			13,633
	Construction/land development			12,000			(137	)		174			269			12,306
	Agricultural			2,878			(261	)		14			369			3,000
	Multifamily residential			2,030			(4	)		4			474			2,504
	Commercial and industrial			3,655			(922	)		433			(311	)		2,855
	Consumer			1,015			(214	)		104			12			917
	Direct financing leases			2,050			(482	)		33			665			2,266
	Other			183			(359	)		144			795			763
	Covered loans			0			(4,675	)		0			4,675			0
	Total		$	38,738		$	(9,002	)	$	1,134		$	12,075		$	42,945
	Three months ended September 30, 2013:
	Real estate:
	Residential 1-4 family		$	4,653		$	(111	)	$	11		$	294		$	4,847
	Non-farm/non-residential			12,464			(19	)		0			304			12,749
	Construction/land development			11,290			(7	)		13			1,434			12,730
	Agricultural			2,595			(260	)		5			182			2,522
	Multifamily residential			1,854			0			0			203			2,057
	Commercial and industrial			2,929			(55	)		56			(172	)		2,758
	Consumer			993			(57	)		19			(13	)		942
	Direct financing leases			2,041			(152	)		9			262			2,160
	Other			553			(93	)		29			406			895
	Covered loans			0			(918	)		0			918			0
	Total		$	39,372		$	(1,672	)	$	142		$	3,818		$	41,660
	Nine months ended September 30, 2013:
Real estate:
Residential 1-4 family		$	4,820		$	(528	)	$	113		$	442		$	4,847
Non-farm/non-residential			10,107			(612	)		118			3,136			12,749
Construction/land development			12,000			(136	)		21			845			12,730
Agricultural			2,878			(260	)		9			(105	)		2,522
Multifamily residential			2,030			0			0			27			2,057
Commercial and industrial			3,655			(887	)		431			(441	)		2,758
Consumer			1,015			(176	)		90			13			942
Direct financing leases			2,050			(338	)		29			419			2,160
Other			183			(266	)		114			864			895
Covered loans			0			(4,012	)		0			4,012			0
Total		$	38,738		$	(7,215	)	$	925		$	9,212		$	41,660
Summary of Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases, Excluding Loans Covered by FDIC	'
	The following table is a summary of the Company’s ALLL and recorded investment in non-purchased loans and leases, as of the dates indicated.
			Allowance for Non-Purchased									Non-Purchased Loans and Leases
			Loan and Lease Losses
			ALLL for			ALLL for			Total			Individually			All Other		Total Loans
			Individually			All Other			ALLL			Evaluated			Loans and		and Leases
			Evaluated			Loans and						Impaired			Leases
			Impaired			Leases						Loans and
			Loans and									Leases
			Leases
			(Dollars in thousands)
	September 30, 2014:
	Real estate:
	Residential 1-4 family		$	345		$	4,957		$	5,302		$	2,360		$	275,981	$	278,341
	Non-farm/non-residential			24			18,004			18,028			2,300			1,370,994		1,373,294
	Construction/land development			2			14,516			14,518			10,191			1,223,062		1,233,253
	Agricultural			30			2,584			2,614			376			46,345		46,721
	Multifamily residential			0			1,611			1,611			0			155,940		155,940
	Commercial and industrial			606			2,333			2,939			578			312,714		313,292
	Consumer			3			819			822			32			25,367		25,399
	Direct financing leases			0			2,821			2,821			0			109,059		109,059
	Other			0			951			951			8			103,835		103,843
	Total		$	1,010		$	48,596		$	49,606		$	15,845		$	3,623,297	$	3,639,142
	December 31, 2013:
	Real estate:
	Residential 1-4 family		$	438		$	4,263		$	4,701		$	4,047		$	245,509	$	249,556
	Non-farm/non-residential			15			13,618			13,633			2,159			1,101,955		1,104,114
	Construction/land development			2			12,304			12,306			236			722,321		722,557
	Agricultural			229			2,771			3,000			883			44,313		45,196
	Multifamily residential			0			2,504			2,504			0			208,337		208,337
	Commercial and industrial			652			2,203			2,855			686			123,382		124,068
	Consumer			3			914			917			50			26,132		26,182
	Direct financing leases			0			2,266			2,266			0			86,321		86,321
	Other			2			761			763			26			66,208		66,234
	Total		$	1,341		$	41,604		$	42,945		$	8,087		$	2,624,478	$	2,632,565
	September 30, 2013:
	Real estate:
	Residential 1-4 family		$	490		$	4,357		$	4,847		$	3,535		$	247,491	$	251,026
	Non-farm/non-residential			6			12,743			12,749			3,572			1,032,046		1,035,618
	Construction/land development			2			12,728			12,730			217			713,981		714,198
	Agricultural			187			2,335			2,522			951			47,002		47,953
	Multifamily residential			0			2,057			2,057			310			163,606		163,916
	Commercial and industrial			613			2,145			2,758			739			121,424		122,163
	Consumer			4			938			942			33			27,265		27,298
	Direct financing leases			0			2,160			2,160			0			81,984		81,984
	Other			1			894			895			20			78,413		78,433
	Total		$	1,303		$	40,357		$	41,660		$	9,377		$	2,513,212	$	2,522,589
Schedule of Impaired Non-purchased Loans and Leases, FDIC Loss Share Agreements	'
	The following table is a summary of impaired non-purchased loans and leases as of and for the three months and nine months ended September 30, 2014.
			Principal			Net			Principal			Specific			Weighted		Weighted
			Balance			Charge-offs			Balance,			ALLL			Average		Average
						to Date			Net of						Carrying		Carrying
									Charge-offs						Value – Three		Value – Nine
															Months Ended		Months Ended
															September 30,		September 30,
															2014		2014
			(Dollars in thousands)
	Impaired loans and leases for which there is a related ALLL:
	Real estate:
	Residential 1-4 family		$	2,984		$	(1,654	)	$	1,330		$	345		$	1,452	$	1,564
	Non-farm/non-residential			415			(216	)		199			24			121		87
	Construction/land development			36			(22	)		14			2			16		16
	Agricultural			116			(12	)		104			30			214		311
	Commercial and industrial			1,314			(764	)		550			606			555		571
	Consumer			101			(84	)		17			3			20		22
	Other			0			(0	)		0			0			0		4
	Total impaired loans and leases with a related ALLL			4,966			(2,752	)		2,214			1,010			2,378		2,575
	Impaired loans and leases for which there is not a related ALLL:
	Real estate:
	Residential 1-4 family			1,343			(313	)		1,030			0			1,352		1,802
	Non-farm/non-residential			2,826			(725	)		2,101			0			2,210		2,025
	Construction/land development			10,258			(81	)		10,177			0			9,949		5,107
	Agricultural			474			(202	)		272			0			397		419
	Multifamily residential			133			(133	)		0			0			246		123
	Commercial and industrial			187			(159	)		28			0			79		73
	Consumer			20			(5	)		15			0			17		21
	Other			8			(0	)		8			0			8		9
	Total impaired loans and leases without a related ALLL			15,249			(1,618	)		13,631			0			14,258		9,579
	Total impaired loans and leases		$	20,215		$	(4,370	)	$	15,845		$	1,010		$	16,636	$	12,154
	The following table is a summary of impaired non-purchased loans and leases as of and for the year ended December 31, 2013.
			Principal			Net			Principal			Specific			Weighted
			Balance			Charge-offs			Balance,			ALLL			Average
						to Date			Net of						Carrying
									Charge-offs						Value – Year
															Ended
															December 31,
															2013
			(Dollars in thousands)
	Impaired loans and leases for which there is a related ALLL:
	Real estate:
	Residential 1-4 family		$	3,609		$	(1,692	)	$	1,917		$	438		$	1,638
	Non-farm/non-residential			121			(75	)		46			15			93
	Construction/land development			38			(22	)		16			2			17
	Agricultural			511			(42	)		469			229			514
	Commercial and industrial			2,016			(1,405	)		611			652			578
	Consumer			178			(156	)		22			3			10
	Other			40			(25	)		15			2			10
	Total impaired loans and leases with a related ALLL			6,513			(3,417	)		3,096			1,341			2,860
	Impaired loans and leases for which there is not a related ALLL:
	Real estate:
	Residential 1-4 family			2,939			(808	)		2,131			0			1,541
	Non-farm/non-residential			3,234			(1,120	)		2,114			0			4,344
	Construction/land development			300			(81	)		219			0			303
	Agricultural			426			(12	)		414			0			404
	Multifamily residential			133			(133	)		0			0			124
	Commercial and industrial			85			(10	)		75			0			172
	Consumer			39			(12	)		27			0			24
	Other			31			(20	)		11			0			9
	Total impaired loans and leases without a related ALLL			7,187			(2,196	)		4,991			0			6,921
	Total impaired loans and leases		$	13,700		$	(5,613	)	$	8,087		$	1,341		$	9,781
	The following table is a summary of impaired non-purchased loans and leases as of and for the three months and nine months ended September 30, 2013.
		Principal			Net			Principal			Specific			Weighted		Weighted
		Balance			Charge-offs			Balance,			ALLL			Average		Average
					to Date			Net of						Carrying		Carrying
								Charge-offs						Value – Three		Value – Nine
														Months Ended		Months Ended
														September 30,		September 30,
														2013		2013
		(Dollars in thousands)
Impaired loans and leases for which there is a related ALLL:
Real estate:
Residential 1-4 family		$	3,601		$	(1,662	)	$	1,939		$	490		$	1,624	$	1,569
Non-farm/non-residential			37			0			37			6			24		105
Construction/land development			129			(112	)		17			2			8		17
Agricultural			459			(42	)		417			187			421		525
Commercial and industrial			2,270			(1,713	)		557			613			558		570
Consumer			39			(13	)		26			4			13		7
Other			145			(137	)		8			1			8		9
Total impaired loans and leases with a related ALLL			6,680			(3,679	)		3,001			1,303			2,656		2,802
Impaired loans and leases for which there is not a related ALLL:
Real estate:
Residential 1-4 family			2,244			(648	)		1,596			0			1,507		1,394
Non-farm/non-residential			4,645			(1,110	)		3,535			0			6,957		4,902
Construction/land development			281			(81	)		200			0			236		324
Agricultural			801			(267	)		534			0			386		401
Multifamily residential			443			(133	)		310			0			311		155
Commercial and industrial			397			(215	)		182			0			166		196
Consumer			19			(12	)		7			0			7		23
Other			32			(20	)		12			0			8		8
Total impaired loans and leases without a related ALLL			8,862			(2,486	)		6,376			0			9,578		7,403
Total impaired loans and leases		$	15,542		$	(6,165	)	$	9,377		$	1,303		$	12,234	$	10,205
Summary of Credit Quality Indicators for Loans and Leases, Including Covered and Non-Covered Loans and Leases	'
	The following table is a summary of credit quality indicators for the Company’s non-purchased loans and leases as of the dates indicated.
			Satisfactory			Moderate			Watch			Substandard			Total
			(Dollars in thousands)
	September 30, 2014:
	Real estate:
	Residential 1-4 family (1)		$	268,707		$	0		$	3,797		$	5,837		$	278,341
	Non-farm/non-residential			1,170,334			141,395			54,078			7,487			1,373,294
	Construction/land development			1,016,496			186,496			16,979			13,282			1,233,253
	Agricultural			24,335			10,202			10,062			2,122			46,721
	Multifamily residential			119,765			35,039			382			754			155,940
	Commercial and industrial			267,178			43,286			1,347			1,481			313,292
	Consumer (1)			24,879			0			263			257			25,399
	Direct financing leases			108,126			829			32			72			109,059
	Other (1)			99,786			3,853			180			24			103,843
	Total		$	3,099,606		$	421,100		$	87,120		$	31,316		$	3,639,142
	December 31, 2013:
	Real estate:
	Residential 1-4 family (1)		$	239,940		$	0		$	3,140		$	6,476		$	249,556
	Non-farm/non-residential			916,304			128,624			52,388			6,798			1,104,114
	Construction/land development			550,436			144,435			23,574			4,112			722,557
	Agricultural			21,647			11,098			9,788			2,663			45,196
	Multifamily residential			177,144			30,029			391			773			208,337
	Commercial and industrial			87,568			33,071			1,664			1,765			124,068
	Consumer (1)			25,574			0			230			378			26,182
	Direct financing leases			85,363			955			0			3			86,321
	Other (1)			63,799			2,237			119			79			66,234
	Total		$	2,167,775		$	350,449		$	91,294		$	23,047		$	2,632,565
	September 30, 2013:
	Real estate:
	Residential 1-4 family(1)		$	242,202		$	0		$	1,438		$	7,386		$	251,026
	Non-farm/non-residential			839,345			134,754			51,589			9,930			1,035,618
	Construction/land development			544,324			136,270			29,122			4,482			714,198
	Agricultural			23,926			11,688			9,317			3,022			47,953
	Multifamily residential			132,722			29,716			394			1,084			163,916
	Commercial and industrial			91,913			26,843			1,210			2,197			122,163
	Consumer(1)			26,763			0			172			363			27,298
	Direct financing leases			80,967			992			0			25			81,984
	Other(1)			74,221			4,005			132			75			78,433
	Total		$	2,056,383		$	344,268		$	93,374		$	28,564		$	2,522,589
	-1	The Company does not risk rate its residential 1-4 family loans, its consumer loans, and certain “other” loans. However, for purposes of the above table, the Company considers such loans to be (i) satisfactory – if they are performing and less than 30 days past due, (ii) watch – if they are performing and 30 to 89 days past due or (iii) substandard – if they are nonperforming or 90 days or more past due.
	The following table is a summary of credit quality indicators for the Company’s covered loans as of the dates indicated.
			FV 1			FV 2			Total
									Covered
									Loans
			(Dollars in thousands)
	September 30, 2014:
	Real estate:
	Residential 1-4 family		$	86,067		$	2,208		$	88,275
	Non-farm/non-residential			107,046			6,587			113,633
	Construction/land development			23,970			3,648			27,618
	Agricultural			9,539			338			9,877
	Multifamily residential			3,513			315			3,828
	Commercial and industrial			4,819			535			5,354
	Consumer			61			3			64
	Other			153			0			153
	Total		$	235,168		$	13,634		$	248,802
	December 31, 2013:
	Real estate:
	Residential 1-4 family		$	105,218		$	5,835		$	111,053
	Non-farm/non-residential			138,573			25,135			163,708
	Construction/land development			33,475			14,267			47,742
	Agricultural			10,807			343			11,150
	Multifamily residential			8,709			457			9,166
Commercial and industrial			8,582			137			8,719
Consumer			106			5			111
Other			142			0			142
Total		$	305,612		$	46,179		$	351,791
September 30, 2013:
Real estate:
Residential 1-4 family		$	114,163		$	6,378		$	120,541
Non-farm/non-residential			171,886			25,566			197,452
Construction/land development			40,172			19,215			59,387
Agricultural			11,203			1,138			12,341
Multifamily residential			9,153			215			9,368
Commercial and industrial			9,877			57			9,934
Consumer			132			6			138
Other			158			0			158
Total		$	356,744		$	52,575		$	409,319
The following table is a summary of credit quality indicators for the Company’s purchased non-covered loans as of the dates indicated.
		Purchased Non-Covered Loans Without														Purchased Non-Covered				Total
		Evidence of Credit Deterioration at Acquisition														Loans With Evidence of				Purchased
																Credit Deterioration  at				Non-Covered
																Acquisition
		FV 33			FV 44			FV 55			FV 36			FV 77		FV 66		FV 88		Loans
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	74,617		$	81,344		$	30,058		$	75,815		$	143	$	17,236	$	60	$	279,273
Non-farm/non-residential			200,653			194,295			32,819			3,283			505		30,742		87		462,384
Construction/land development			28,857			33,070			9,607			13,783			9		9,011		0		94,337
Agricultural			12,510			26,723			3,053			1,933			0		189		0		44,408
Multifamily residential			9,877			13,019			7,226			940			72		2,764		781		34,679
Total real estate			326,514			348,451			82,763			95,754			729		59,942		928		915,081
Commercial and industrial			23,424			27,645			7,282			13,284			0		5,066		0		76,701
Consumer			2,498			884			627			16,023			0		429		0		20,461
Other			5,105			8,369			735			3,776			0		760		0		18,745
Total		$	357,541		$	385,349		$	91,407		$	128,837		$	729	$	66,197	$	928	$	1,030,988
December 31, 2013:
Real estate:
Residential 1-4 family		$	27,111		$	32,259		$	21,035		$	35,733		$	0	$	14,947	$	0	$	131,085
Non-farm/non-residential			42,193			72,621			20,685			1,191			0		16,258		0		152,948
Construction/land development			5,930			8,106			2,137			4,553			0		4,907		0		25,633
Agricultural			1,547			6,619			823			164			0		365		0		9,518
Multifamily residential			3,531			5,565			5,268			959			0		1,887		0		17,210
Total real estate			80,312			125,170			49,948			42,600			0		38,364		0		336,394
Commercial and industrial			9,592			9,730			2,250			1,879			0		1,483		0		24,934
Consumer			1,013			141			171			4,794			0		736		0		6,855
Other			1,202			2,897			157			237			0		47		0		4,540
Total		$	92,119		$	137,938		$	52,526		$	49,510		$	0	$	40,630	$	0	$	372,723
September 30, 2013:
Real estate:
Residential 1-4 family		$	28,486		$	34,113		$	21,592		$	36,221		$	0	$	16,311	$	0	$	136,723
Non-farm/non-residential			46,201			71,637			25,591			3,509			0		16,786		0		163,724
Construction/land development			5,973			8,578			2,495			4,680			0		5,052		0		26,778
Agricultural			2,109			6,705			851			173			0		242		0		10,080
Multifamily residential			3,621			5,662			5,322			978			0		2,419		0		18,002
Total real estate			86,390			126,695			55,851			45,561			0		40,810		0		355,307
Commercial and industrial			10,684			10,793			3,150			4,004			0		1,598		0		30,229
Consumer			1,980			147			181			5,990			0		878		0		9,176
Other			1,333			2,323			163			329			0		198		0		4,346
Total		$	100,387		$	139,958		$	59,345		$	55,884		$	0	$	43,484	$	0	$	399,058
Schedule of Aging Analysis Past Due Loans and Leases, Loans Covered & Non-Covered by FDIC Loss Share Agreements	'
	The following table is an aging analysis of past due non-purchased loans and leases as of the dates indicated.
			30-89 Days			90 Days			Total			Current (3)			Total
			Past Due (1)			or More (2)			Past Due
			(Dollars in thousands)
	September 30, 2014:
	Real estate:
	Residential 1-4 family		$	4,203		$	1,230		$	5,433		$	272,908		$	278,341
	Non-farm/non-residential			879			1,432			2,311			1,370,983			1,373,294
	Construction/land development			1,854			10,017			11,871			1,221,382			1,233,253
	Agricultural			1,574			192			1,766			44,955			46,721
	Multifamily residential			0			0			0			155,940			155,940
	Commercial and industrial			813			28			841			312,451			313,292
	Consumer			295			35			330			25,069			25,399
	Direct financing leases			0			0			0			109,059			109,059
	Other			12			0			12			103,831			103,843
	Total		$	9,630		$	12,934		$	22,564		$	3,616,578		$	3,639,142
	December 31, 2013:
	Real estate:
	Residential 1-4 family		$	4,228		$	2,004		$	6,232		$	243,324		$	249,556
	Non-farm/non-residential			2,093			1,867			3,960			1,100,154			1,104,114
	Construction/land development			235			153			388			722,169			722,557
	Agricultural			517			540			1,057			44,139			45,196
	Multifamily residential			773			0			773			207,564			208,337
	Commercial and industrial			418			31			449			123,619			124,068
	Consumer			261			78			339			25,843			26,182
	Direct financing leases			0			0			0			86,321			86,321
	Other			18			24			42			66,192			66,234
	Total		$	8,543		$	4,697		$	13,240		$	2,619,325		$	2,632,565
	September 30, 2013:
	Real estate:
	Residential 1-4 family		$	1,661		$	2,376		$	4,037		$	246,989		$	251,026
	Non-farm/non-residential			2,321			3,312			5,633			1,029,985			1,035,618
	Construction/land development			1,662			136			1,798			712,400			714,198
	Agricultural			322			571			893			47,060			47,953
	Multifamily residential			0			310			310			163,606			163,916
	Commercial and industrial			349			131			480			121,683			122,163
	Consumer			177			66			243			27,055			27,298
	Direct financing leases			111			25			136			81,848			81,984
	Other			17			0			17			78,416			78,433
	Total		$	6,620		$	6,927		$	13,547		$	2,509,042		$	2,522,589
	-1	Includes $0.9 million, $0.8 million and $0.4 million of loans and leases on nonaccrual status at September 30, 2014, December 31, 2013 and September 30, 2013, respectively.
	-2	All loans and leases greater than 90 days past due were on nonaccrual status at September 30, 2014 and 2013 and December 31, 2013.
	-3	Includes $3.9 million, $3.2 million and $3.1 million of loans and leases on nonaccrual status at September 30, 2014, December 31, 2013 and September 30, 2013, respectively.
	The following table is an aging analysis of past due covered loans as of the dates indicated.
			30-89 Days			90 Days			Total			Current			Total
			Past Due			or More			Past Due						Covered
															Loans
			(Dollars in thousands)
	September 30, 2014:
	Real estate:
	Residential 1-4 family		$	3,075		$	7,298		$	10,373		$	77,902		$	88,275
	Non-farm/non-residential			3,481			8,112			11,593			102,040			113,633
	Construction/land development			922			5,008			5,930			21,688			27,618
	Agricultural			0			1,652			1,652			8,225			9,877
	Multifamily residential			0			0			0			3,828			3,828
	Commercial and industrial			9			603			612			4,742			5,354
	Consumer			10			0			10			54			64
	Other			0			0			0			153			153
	Total		$	7,497		$	22,673		$	30,170		$	218,632		$	248,802
	December 31, 2013:
	Real estate:
	Residential 1-4 family		$	5,341		$	12,409		$	17,750		$	93,303		$	111,053
	Non-farm/non-residential			6,954			32,462			39,416			124,292			163,708
Construction/land development			2,173			20,914			23,087			24,655			47,742
Agricultural			237			1,328			1,565			9,585			11,150
Multifamily residential			375			3,240			3,615			5,551			9,166
Commercial and industrial			605			2,001			2,606			6,113			8,719
Consumer			10			0			10			101			111
Other			0			0			0			142			142
Total		$	15,695		$	72,354		$	88,049		$	263,742		$	351,791
September 30, 2013:
Real estate:
Residential 1-4 family		$	6,260		$	13,658		$	19,918		$	100,623		$	120,541
Non-farm/non-residential			8,557			39,841			48,398			149,054			197,452
Construction/land development			848			27,584			28,432			30,955			59,387
Agricultural			1,234			1,250			2,484			9,857			12,341
Multifamily residential			195			3,689			3,884			5,484			9,368
Commercial and industrial			27			2,961			2,988			6,946			9,934
Consumer			0			2			2			136			138
Other			0			0			0			158			158
Total		$	17,121		$	88,985		$	106,106		$	303,213		$	409,319
The following table is an aging analysis of past due purchased non-covered loans as of the dates indicated.
		30-89 Days			90 Days			Total			Current			Total
		Past Due			or More			Past Due						Purchased
														Non-Covered
														Loans
		(Dollars in thousands)
September 30, 2014:
Real estate:
Residential 1-4 family		$	6,026		$	6,220		$	12,246		$	267,027		$	279,273
Non-farm/non-residential			1,706			9,449			11,155			451,229			462,384
Construction/land development			855			1,476			2,331			92,006			94,337
Agriculture			211			146			357			44,051			44,408
Multifamily residential			0			1,228			1,228			33,451			34,679
Commercial and industrial			791			269			1,060			75,641			76,701
Consumer			196			159			355			20,106			20,461
Other			73			31			104			18,641			18,745
Total		$	9,858		$	18,978		$	28,836		$	1,002,152		$	1,030,988
December 31, 2013:
Real estate:
Residential 1-4 family		$	6,615		$	4,703		$	11,318		$	119,767		$	131,085
Non-farm/non-residential			4,886			5,779			10,665			142,283			152,948
Construction/land development			265			4,045			4,310			21,323			25,633
Agriculture			134			25			159			9,359			9,518
Multifamily residential			421			1,225			1,646			15,564			17,210
Commercial and industrial			614			388			1,002			23,932			24,934
Consumer			411			237			648			6,207			6,855
Other			0			33			33			4,507			4,540
Total		$	13,346		$	16,435		$	29,781		$	342,942		$	372,723
September 30, 2013:
Real estate:
Residential 1-4 family		$	4,026		$	3,647		$	7,673		$	129,050		$	136,723
Non-farm/non-residential			3,319			4,136			7,455			156,269			163,724
Construction/land development			4,601			7,367			11,968			14,810			26,778
Agriculture			0			101			101			9,979			10,080
Multifamily residential			177			1,326			1,503			16,499			18,002
Commercial and industrial			357			535			892			29,337			30,229
Consumer			310			223			533			8,643			9,176
Other			38			182			220			4,126			4,346
Total		$	12,828		$	17,517		$	30,345		$	368,713		$	399,058

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2014
Income Tax Disclosure [Abstract]	'
Types of Temporary Differences Between Tax Basis of Assets and Liabilities	'
	The following table is a summary of the types of temporary differences between the tax basis of assets and liabilities and their financial reporting amounts that give rise to deferred income tax assets and liabilities and their approximate tax effects as of the dates indicated.
		September 30,					December 31,
		2014			2013		2013
		(Dollars in thousands)
	Deferred tax assets:
	Allowance for loan and lease losses	$	19,052		$	16,080	$	16,576
	Differences in amounts reflected in financial statements and income tax basis of purchased non-covered loans		24,769			19,563		17,167
	Stock-based compensation		3,811			2,724		2,400
	Deferred compensation		1,962			1,792		1,775
	Foreclosed assets		5,195			3,318		3,165
	Investment securities AFS		0			3,116		5,056
	Differences in amounts reflected in financial statements and income tax basis of assets acquired and liabilities assumed in FDIC-assisted acquisitions		8,708			607		3,424
	Acquired net operating losses		13,976			7,905		7,509
	Other, net		7,310			1,950		3,858
	Total gross deferred tax assets		84,783			57,055		60,930
	Less valuation allowance		(474	)		0		0
	Net deferred tax asset		84,309			57,055		60,930
	Deferred tax liabilities:
	Accelerated depreciation on premises and equipment		17,933			16,952		17,459
	Investment securities AFS		5,499			0		0
	Acquired intangible assets		10,466			4,390		4,227
	Total gross deferred tax liabilities		33,898			21,342		21,686
	Net deferred tax assets (liabilities)	$	50,411		$	35,713	$	39,244

Supplemental_Data_for_Cash_Flo1

Supplemental Data for Cash Flows (Tables)	9 Months Ended
	Sep. 30, 2014
Supplemental Cash Flow Elements [Abstract]	'
Schedule of Supplemental Cash Flow Information	'
	The following table provides supplemental cash flow information for the periods indicated.
		Nine Months Ended
		September 30,
		2014		2013
		(Dollars in thousands)
	Cash paid during the period for:
	Interest	$	15,450	$	14,038
	Taxes		30,834		35,515
	Supplemental schedule of non-cash investing and financing activities:
	Net change in unrealized gains/losses on investment securities AFS		23,687		(18,488	)
	Loans and other assets transferred to foreclosed assets not covered by FDIC loss share agreements		9,112		4,497
	Loans advanced for sales of foreclosed assets not covered by FDIC loss share agreements		258		2,942
	Covered loans transferred to covered foreclosed assets		30,754		24,306
	Unsettled AFS investment security purchases		0		730
	Common stock issued in merger and acquisition transactions		166,402		60,079

Guarantees_and_Commitments_Tab

Guarantees and Commitments (Tables)	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Contractual Maturities	'
	While many of these commitments are expected to be disbursed within the next 12 months, the following table shows the contractual maturities of outstanding commitments to extend credit as of the date indicated.
	Contractual Maturities at September 30, 2014
	Maturity	Amount
	(Dollars in thousands)
	2014	$	89,808
	2015		209,595
	2016		492,517
	2017		1,259,690
	2018		485,222
	Thereafter		47,613
	Total	$	2,584,445

StockBased_Compensation_Tables

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Summary of Stock Option Activity	'
	The following table summarizes stock option activity for both the employee and non-employee director stock option plans for the period indicated.
			Options			Weighted-		Weighted-Average		Aggregate
						Average		Remaining		Intrinsic
						Exercise		Contractual Life		Value
						Price/Share		(in years)		(in thousands)
	Nine Months Ended September 30, 2014:
	Outstanding – January 1, 2014			1,766,600		$	15.84
	Granted			52,000			29.05
	Exercised			(228,600	)		9.05
	Forfeited			(48,800	)		18.36
	Outstanding – September 30, 2014			1,541,200			17.21		5.2	$	22,058	(1)
	Fully vested and exercisable – September 30, 2014			305,600			13.65		5.2	$	5,460	(1)
	Expected to vest in future periods			989,280
	Fully vested and expected to vest – September 30, 2014(2)			1,294,880			17.04		5.2	$	18,744	(1)
	-1	Based on closing price of $31.52 per share on September 30, 2014.
	-2	At September 30, 2014 the Company estimated that outstanding options to purchase 246,320 shares of its common stock would not vest and would be forfeited prior to their vesting date.
Summary of Non-Vested Restricted Stock Activity	'
	The following table summarizes non-vested restricted stock activity for the period indicated.
			Nine Months Ended
			September 30, 2014
	Outstanding – January 1, 2014			616,100
	Granted			0
	Forfeited			(1,200	)
	Vested			0
	Outstanding – September 30, 2014			614,900
	Weighted-average grant date fair value		$	17.99

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value Disclosures [Abstract]	'
Assets at Fair Value	'
	The following table sets forth the Company’s assets, for the dates indicated, that are accounted for at fair value.
			Level 1			Level 2		Level 3		Total
			(Dollars in thousands)
	September 30, 2014:
	Investment securities AFS(1):
	Obligations of state and political subdivisions		$	0		$	568,021	$	19,558	$	587,579
	U.S. Government agency securities			0			254,062		0		254,062
	Corporate obligations			0			655		0		655
	Total investment securities AFS			0			822,738		19,558	$	842,296
	Impaired non-purchased loans and leases			0			0		14,835		14,835
	Impaired covered loans			0			0		13,634		13,634
	Impaired purchased non-covered loans			0			0		1,657		1,657
	Foreclosed assets not covered by FDIC loss share agreements			0			0		14,781		14,781
	Foreclosed assets covered by FDIC loss share agreements			0			0		27,882		27,882
	Total assets at fair value		$	0		$	822,738	$	92,347	$	915,085
	December 31, 2013:
	Investment securities AFS(1):
	Obligations of state and political subdivisions		$	0		$	417,307	$	18,682	$	435,989
	U.S. Government agency securities			0			218,869		0		218,869
	Corporate obligations			0			716		0		716
	Total investment securities AFS			0			636,892		18,682		655,574
	Impaired non-purchased loans and leases			0			0		6,746		6,746
	Impaired covered loans			0			0		46,179		46,179
	Foreclosed assets not covered by FDIC loss share agreements			0			0		11,851		11,851
	Foreclosed assets covered by FDIC loss share agreements			0			0		37,960		37,960
	Total assets at fair value		$	0		$	636,892	$	121,418	$	758,310
	September 30, 2013:
	Investment securities AFS(1):
	Obligations of state and political subdivisions		$	0		$	412,770	$	18,798	$	431,568
	U.S. Government agency securities			0			225,311		0		225,311
	Corporate obligations			0			717		0		717
	Total investment securities AFS			0			638,798		18,798		657,596
	Impaired non-purchased loans and leases			0			0		8,074		8,074
	Impaired covered loans			0			0		52,575		52,575
	Foreclosed assets not covered by FDIC loss share agreements			0			0		11,647		11,647
	Foreclosed assets covered by FDIC loss share agreements			0			0		40,452		40,452
	Total assets at fair value		$	0		$	638,798	$	131,546	$	770,344
	-1	Does not include $17.6 million at September 30, 2014; $13.8 million at December 31, 2013 and $13.8 million at September 30, 2013 of FHLB – Dallas and FNBB stock that do not have readily determinable fair values and are carried at cost.
Schedule of Information Related to Level 3 Non-Recurring Fair Value Measurements	'
	The following table presents information related to Level 3 non-recurring fair value measurements as of the date indicated.
	Description		Fair Value at		Technique	Unobservable Inputs
			September 30, 2014
	(Dollars in thousands)
	Impaired non-purchased loans and leases		$14,835		Third party appraisal(1) or discounted cash flows	1. Management discount based on underlying collateral characteristics and market conditions
						2. Life of loan
	Impaired covered loans		$13,634		Third party appraisal(1) and/or discounted cash flows	1. Management discount based on underlying collateral characteristics and market conditions
						2. Life of loan
						3. Discount rate
	Impaired purchased non-covered loans		$1,657		Third party appraisal(1) and/or discounted cash flows	1. Management discount based on underlying collateral characteristics and market conditions
						2. Discount rate
						3. Holding period
	Foreclosed assets not covered by FDIC loss share agreements		$14,781		Third party appraisal,(1) broker price opinions and/or discounted cash flows	1. Management discount based on asset characteristics and market conditions
						2. Discount rate
						3. Holding period
	Foreclosed assets covered by FDIC loss share agreements		$27,882		Third party appraisal,(1) broker price opinions and/or discounted cash flows	1. Management discount based on asset characteristics and market conditions
						2. Discount rate
						3. Holding period
	-1	The Company utilizes valuation techniques consistent with the market, cost, and income approaches, or a combination thereof in determining fair value.
Assets Measured at Fair Value on Recurring Basis Utilizing Level 3 Inputs	'
	The following table presents additional information for the periods indicated about assets measured at fair value on a recurring basis and for which the Company has utilized Level 3 inputs to determine fair value.
			Investment
			Securities AFS
			(Dollars in thousands)
	Balance – January 1, 2014		$	18,682
	Total realized gains (losses) included in earnings			0
	Total unrealized gains (losses) included in comprehensive income			497
	Acquired			1,907
	Paydowns and maturities			(672	)
	Sales			(856	)
	Transfers in and/or out of Level 3			0
	Balance – September 30, 2014		$	19,558
	Balance – January 1, 2013		$	104,172
	Total realized gains (losses) included in earnings			0
	Total unrealized gains (losses) included in comprehensive income			(1,940	)
	Paydowns and maturities			(32,647	)
	Sales			0
	Transfers in and/or out of Level 3			(50,787	)
	Balance –September 30, 2013		$	18,798

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Estimated Fair Values of Financial Instruments	'
	The following table presents the carrying amounts and estimated fair values for the dates indicated and the fair value hierarchy of the Company’s financial instruments.
			September 30,
			2014				2013				December 31, 2013
		Fair	Carrying		Estimated		Carrying		Estimated		Carrying		Estimated
		Value	Amount		Fair		Amount		Fair		Amount		Fair
		Hierarchy			Value				Value				Value
			(Dollars in thousands)
	Financial assets:
	Cash and cash equivalents	Level 1	$	112,084	$	112,084	$	124,458	$	124,458	$	195,975	$	195,975
	Investment securities AFS	Levels 2 and 3		859,876		859,876		671,393		671,393		669,384		669,384
	Loans and leases, net of ALLL	Level 3		4,869,329		4,822,383		3,289,306		3,263,428		3,314,134		3,286,600
	FDIC loss share receivable	Level 3		36,583		36,130		89,642		89,617		71,854		71,770
	Financial liabilities:
	Demand, savings and interest bearing transaction deposits	Level 1	$	3,877,373	$	3,877,373	$	2,677,030	$	2,677,030	$	2,819,817	$	2,819,817
	Time deposits	Level 2		1,262,332		1,263,635		977,656		978,202		897,210		897,708
	Repurchase agreements with customers	Level 1		73,942		73,942		50,254		50,254		53,103		53,103
	Other borrowings	Level 2		352,616		373,696		280,905		322,171		280,895		319,650
	FDIC clawback payable	Level 3		26,676		26,676		25,705		25,705		25,897		25,897
	Subordinated debentures	Level 2		64,950		33,452		64,950		30,815		64,950		30,974

Changes_In_and_Reclassificatio1

Changes In and Reclassifications From Accumulated Other Comprehensive Income ("AOCI") (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Changes in Accumulated Other Comprehensive Income	'
	The following table presents changes in AOCI for the dates indicated.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014			2013
		(Dollars in thousands)
	Beginning balance of AOCI – unrealized gains and losses on investment securities AFS	$	10,006		$	(898	)	$	(3,672	)	$	10,783
	Other comprehensive income (loss):
	Other comprehensive income (loss) before reclassifications		744			445			14,437			(11,142	)
	Amounts reclassified from AOCI		(26	)		0			(41	)		(94	)
	Total other comprehensive income (loss)		718			445			14,396			(11,236	)
	Ending balance of AOCI – unrealized gains and losses on investment securities AFS	$	10,724		$	(453	)	$	10,724		$	(453	)

Organization_and_Principles_of1

Organization and Principles of Consolidation - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2014
	Office
	Trust
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Ownership interest owned finance subsidiary business trusts	100.00%
Number of finance subsidiary trusts	4
Number of offices	165
Arkansas [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	88
Georgia [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	28
Texas [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	21
North Carolina [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	17
Florida [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	5
Alabama [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	3
South Carolina [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	1
New York [Member]	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	1
California	'
Organization Consolidation And Presentation Of Financial Statements [Line Items]	'
Number of offices	1

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail)	0 Months Ended	9 Months Ended
	Jun. 23, 2014	Sep. 30, 2014
Accounting Policies [Abstract]	'	'
Stock split date	'	23-Jun-14
Stock split ratio as of stock split date	2	'
Number of shares effected by issuing shares, stock split	1	'
Number of months management has to finalize the fair values of acquired assets and assumed liabilities	'	'12 months

Acquisitions_Additional_Inform

Acquisitions - Additional Information (Detail) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

1 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Jul. 31, 2013

Mar. 05, 2014

Sep. 30, 2014

Sep. 30, 2014

Jul. 31, 2013

Sep. 30, 2014

Sep. 30, 2013

Jul. 31, 2014

Sep. 30, 2014

16-May-14

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

16-May-14

16-May-14

Mar. 05, 2014

Mar. 05, 2014

Mar. 05, 2014

Mar. 05, 2014

Mar. 05, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Bancshares Inc [Member]

Bancshares Inc [Member]

Bancshares Inc [Member]

First National Bank [Member]

First National Bank [Member]

First National Bank [Member]

Intervest Bancshares Corporation [Member]

Intervest Bancshares Corporation [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Intervest National Bank (INB) [Member]

Minimum [Member]

Maximum [Member]

Central South And Western Arkansas [Member]

Arkansas Counties [Member]

Houston [Member]

Austin [Member]

Cedar Park [Member]

Lockhart [Member]

San Antonio Texas [Member]

Clearwater [Member]

New York [Member]

Pasadena [Member]

Office

Office

Office

Intervest Bancshares Corporation [Member]

Intervest Bancshares Corporation [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Office

Office

Office

Office

Office

Intervest National Bank (INB) [Member]

Intervest National Bank (INB) [Member]

Intervest National Bank (INB) [Member]

Office

Country

Office

Office

Office

Office

Business Acquisition Information [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total transaction value

'

'

'

'

'

'

'

'

'

'

'

'

$228,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Date of definitive agreement

'

'

'

'

'

'

'

'

'

'

'

'

'

31-Jul-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total asset

6,580,360,000

4,710,567,000

6,580,360,000

4,710,567,000

4,791,170,000

'

'

'

'

'

'

'

'

'

'

'

'

1,510,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Loans

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,180,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Investment securities

859,876,000

671,393,000

859,876,000

671,393,000

669,384,000

'

'

'

'

'

'

'

'

'

'

'

'

310,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Deposits

5,139,705,000

3,654,686,000

5,139,705,000

3,654,686,000

3,717,027,000

'

'

'

'

'

'

'

'

'

'

'

'

1,210,000,000

'

'

'

'

'

'

'

'

'

'

'

'

Number of bank offices

'

'

'

'

'

'

'

'

'

'

'

14

'

'

'

'

'

7

'

'

23

'

3

1

1

1

1

5

1

1

Average closing stock price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$23.95

$39.91

'

'

'

'

'

'

'

'

'

'

Measurement period for determining the average closing stock price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'Fifth business day

'

'

'

'

'

'

'

'

'

'

'

Number of days for calculation of average closing stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 days

'

'

'

'

'

'

'

'

'

'

'

Date of acquisition

'

'

'

'

'

'

5-Mar-14

'

'

31-Jul-13

'

'

'

'

16-May-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash consideration

'

'

'

'

'

'

21,500,000

'

'

8,400,000

'

'

'

'

42,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of common stock issued

'

'

'

'

'

'

'

'

'

2,514,770

'

'

'

'

5,765,846

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of loan production office

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

Number of Arkansas countries

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9

'

'

'

'

'

'

'

'

Number of banking offices closed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of loan production office closed

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

Goodwill

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

73,400,000

73,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Net interest income

74,621,000

50,633,000

191,819,000

138,237,000

'

'

'

2,100,000

5,500,000

'

'

'

'

'

'

10,900,000

16,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Net income

32,080,000

26,485,000

83,826,000

66,875,000

'

'

'

1,100,000

7,500,000

'

'

'

'

'

'

5,000,000

7,400,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Tax-exempt bargain purchase gain

0

5,163,000

4,667,000

5,163,000

'

'

'

'

4,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Purchase of real property from party

'

'

'

'

'

'

'

'

'

3,800,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of office closed

'

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Increase in bargain purchase gain

'

'

'

'

'

'

'

'

'

'

4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred tax valuation allowance, initially established

'

'

'

'

'

$4,100,000

'

'

'

'

$4,100,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Acquisitions_Summary_of_Assets

Acquisitions - Summary of Assets Acquired and Liabilities Assumed in Acquisition (Detail) (USD $)

3 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2013

Jul. 31, 2013

16-May-14

Sep. 30, 2014

16-May-14

16-May-14

Mar. 05, 2014

Jul. 31, 2013

Mar. 05, 2014

Mar. 05, 2014

Sep. 30, 2013

Jul. 31, 2013

Jul. 31, 2013

Recast Adjustment [Member]

Recast Adjustment [Member]

Summit Bancorp, Inc. [Member]

Summit Bancorp, Inc. [Member]

Fair Value Adjustments Summit Bancorp Inc [Member]

As recorded by the Company [Member]

As recorded by the Company [Member]

As recorded by the Company [Member]

Bancshares Inc [Member]

Fair Value Adjustments Bancshares Inc [Member]

First National Bank [Member]

First National Bank [Member]

Fair Value Adjustments First National Bank [Member]

Business Combination, Separately Recognized Transactions [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Cash and due from banks

'

'

'

'

'

$0

$84,106

'

($304)

[1]

$83,802

$102,156

$69,285

$102,156

$0

'

$69,285

$0

Investment securities

'

'

'

'

'

0

242,149

'

765

[2]

242,914

1,859

149,344

1,860

-1

[2]

'

149,943

-599

[2]

Loans and leases

'

'

'

'

'

0

742,546

'

-24,718

[3]

717,828

155,175

388,067

165,939

-10,764

[3]

'

432,250

-44,183

[3]

Allowance for loan losses

'

'

'

'

'

0

-13,183

'

13,183

[3]

0

0

0

-5,280

5,280

[3]

'

-13,931

13,931

[3]

Premises and equipment

'

'

'

'

'

0

13,773

'

-1,108

[4]

12,665

7,878

19,382

6,259

1,619

[4]

'

14,318

5,064

[4]

Foreclosed assets

'

'

'

'

'

0

3,094

'

-1,088

[5]

2,006

4,718

2,158

7,634

-2,916

[5]

'

3,073

-915

[5]

Accrued interest receivable

'

'

'

'

'

0

11,016

'

1,461

[6]

12,477

314

1,124

608

-294

[6]

'

1,234

-110

[6]

Bank owned life insurance

'

'

'

'

'

0

33,398

'

0

33,398

'

14,812

'

'

'

14,812

0

Core deposit intangible asset

'

'

'

'

'

0

0

'

15,340

[7]

15,340

2,648

10,136

0

2,648

[7]

'

0

10,136

[7]

Deferred income taxes

'

'

'

'

'

4,102

3,878

'

953

[8]

4,831

8,991

28,606

7,110

1,881

[9]

'

12,179

12,325

[10]

Other assets

'

'

'

'

'

0

'

'

'

'

'

4,026

'

'

'

4,277

-251

[6]

Total assets acquired

'

'

'

'

'

4,102

1,120,777

'

4,484

1,125,261

283,739

686,940

286,286

-2,547

'

687,440

-4,602

Deposits

'

'

'

'

'

0

965,687

'

4,074

[11]

969,761

255,919

600,618

255,798

121

[11]

'

595,668

4,950

[11]

Repurchase agreements with customers

'

'

'

'

'

0

16,515

'

0

16,515

'

6,405

'

'

'

6,405

0

Accrued interest payable and other liabilities

'

'

'

'

'

0

2,352

'

1,206

[12]

3,558

1,653

2,460

1,358

295

[13]

'

1,296

1,164

[14]

Total liabilities assumed

'

'

'

'

'

0

984,554

'

5,280

989,834

257,572

609,483

257,156

416

'

603,369

6,114

Net assets acquired

'

'

'

'

'

4,102

136,223

'

-796

135,427

26,167

77,457

29,130

-2,963

'

84,071

-10,716

Cash

'

'

'

'

'

'

'

'

'

42,451

'

-12,215

'

'

'

'

'

Common stock

'

'

'

'

'

'

'

-166,315

'

166,402

'

-60,079

'

'

-59,794

'

'

Total consideration paid

'

'

'

'

'

'

'

'

'

208,853

-21,500

-72,294

'

'

'

'

'

Gain on acquisition

0

5,163

4,667

5,163

4,102

'

'

'

'

'

4,667

5,163

'

'

'

'

'

Goodwill

'

'

'

'

'

'

'

$73,400

'

$73,426

'

'

'

'

'

'

'

[1]

Adjustment reflects the fair value adjustment based on the Company's evaluation of acquired interest earning deposits.

[2]

Adjustment reflects the fair value adjustment based on the Company's pricing of the acquired investment securities portfolio.

[3]

Adjustment reflects the fair value adjustment based on the Company's evaluation of the acquired loan portfolio and to eliminate the recorded allowance for loan losses.

[4]

Adjustment reflects the fair value adjustment based on the Company's evaluation of the premises and equipment acquired.

[5]

Adjustment reflects the fair value adjustment based on the Company's evaluation of the acquired foreclosed assets.

[6]

Adjustment reflects the fair value adjustment based on the Company's evaluation of accrued interest receivable and other assets.

[7]

Adjustment reflects the fair value adjustment for the core deposit intangible asset recorded as a result of the acquisition.

[8]

This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes.

[9]

This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes. Management has determined that acquired net operating loss carryforwards are expected to be settled in future periods where the realization of such benefits would be subject to limitations under section 382 of the Internal Revenue Code ("section 382 limitations"). Accordingly, as of the date of acquisition, the Company had established a deferred tax asset valuation allowance of approximately $0.5 million to reflect its assessment that the realization of the benefits from the settlement of these acquired net operating losses is expected to be subject to section 382 limitations. To the extent that additional information becomes available, management may be required to adjust its estimates and assumptions regarding the realization of the benefits associated with these acquired net operating losses by adjusting this deferred tax asset valuation allowance.

[10]

This adjustment reflects the differences in the carrying values of acquired assets and assumed liabilities for financial reporting purposes and their basis for federal income tax purposes. Management initially determined that acquired net operating loss carryforwards and other acquired assets with built-in losses were expected to be settled or otherwise recovered in future periods where the realization of such benefits would be subject to section 382 limitations. Accordingly, at the date of acquisition, the Company established a deferred tax asset valuation allowance of approximately $4.1 million to reflect its initial assessment that the realization of the benefits from the settlement or recovery of certain of these acquired assets and net operating losses was expected to be subject to section 382 limitations. During the second quarter of 2014, management determined such valuation allowance was not necessary. Accordingly, the Company's acquisition of First National Bank has been recast to reflect such determination.

[11]

Adjustment reflects the fair value adjustment based on the Company's evaluation of the acquired deposits.

[12]

Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of Summit.

[13]

Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of Bancshares.

[14]

Adjustment reflects the amount needed to adjust other liabilities to estimated fair value and to record certain liabilities directly attributable to the acquisition of First National Bank.

Acquisitions_Summary_of_Supple

Acquisitions - Summary of Supplemental Pro-forma Information (Detail) (Summit Bancorp, Inc. [Member], USD $)	9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Summit Bancorp, Inc. [Member]	'	'
Loans At Acquisition Date [Line Items]	'	'
Net interest income - pro forma (unaudited)	$208,758	$171,824
Net income - pro forma (unaudited)	$91,402	$81,787
Diluted earnings per common share - pro forma (unaudited)	$1.14	$1.05

Acquisitions_Summary_of_Assets1

Acquisitions - Summary of Assets Acquired and Liabilities Assumed in Acquisition (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Mar. 05, 2014	Dec. 31, 2013	Sep. 30, 2013	Jul. 31, 2013
Business Combinations [Abstract]	'	'	'	'	'
Deferred tax valuation allowance	$474,000	$500,000	$0	$0	'
Deferred tax valuation allowance, initially established	'	'	'	'	$4,100,000

Acquisitions_Summary_of_Financ

Acquisitions - Summary of Financial Statement Captions Impacted by Recast Adjustments (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 05, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]	'	'	'	'	'	'
Deferred income tax asset valuation allowance	$474	$0	$474	$0	$500	$0
Total stockholders' equity before noncontrolling interest	875,578	612,338	875,578	612,338	'	629,060
Gain on merger and acquisition transaction	0	5,163	4,667	5,163	'	'
Net income available to common stockholders	32,093	26,452	83,855	66,839	'	'
Diluted earnings per common share, split adjusted	$0.40	$0.36	$1.08	$0.93	'	'
As Previously Reported [Member]	'	'	'	'	'	'
Valuation Allowance [Line Items]	'	'	'	'	'	'
Deferred income tax asset valuation allowance	'	-4,102	'	-4,102	'	'
Total stockholders' equity before noncontrolling interest	'	608,236	'	608,236	'	'
Gain on merger and acquisition transaction	'	'	'	1,061	'	'
Net income available to common stockholders	'	'	'	62,737	'	'
Diluted earnings per common share, split adjusted	'	'	'	$0.87	'	'
Recast Adjustment [Member]	'	'	'	'	'	'
Valuation Allowance [Line Items]	'	'	'	'	'	'
Deferred income tax asset valuation allowance	'	4,102	'	4,102	'	'
Total stockholders' equity before noncontrolling interest	'	4,102	'	4,102	'	'
Gain on merger and acquisition transaction	'	'	'	4,102	'	'
Net income available to common stockholders	'	'	'	4,102	'	'
Diluted earnings per common share, split adjusted	'	'	'	$0.06	'	'
As Recast [Member]	'	'	'	'	'	'
Valuation Allowance [Line Items]	'	'	'	'	'	'
Deferred income tax asset valuation allowance	'	0	'	0	'	'
Total stockholders' equity before noncontrolling interest	'	612,338	'	612,338	'	'
Gain on merger and acquisition transaction	'	'	'	5,163	'	'
Net income available to common stockholders	'	'	'	$66,839	'	'
Diluted earnings per common share, split adjusted	'	'	'	$0.93	'	'

Earnings_Per_Common_Share_EPS_1

Earnings Per Common Share ("EPS") - Additional Information (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Options to purchase shares of the Company's common stock	0	0	0	4,000

Earnings_Per_Common_Share_EPS_2

Earnings Per Common Share ("EPS") - Schedule of Calculation of Numerator and Denominator in Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Distributed earnings allocated to common stock	$9,560	$6,732	$26,166	$18,036
Undistributed earnings allocated to common stock	22,533	19,720	57,689	48,803
Net income available to common stock	$32,093	$26,452	$83,855	$66,839
Denominator for basic EPS - weighted-average common shares	79,678	72,544	76,763	71,338
Effect of dilutive securities - stock options	767	752	706	650
Denominator for diluted EPS - weighted-average common shares and assumed conversions	80,445	73,296	77,469	71,988
Basic EPS	$0.40	$0.36	$1.09	$0.94
Diluted EPS	$0.40	$0.36	$1.08	$0.93

Investment_Securities_Summary_

Investment Securities - Summary of Amortized Cost and Estimated Fair Values of Investment Securities (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Amortized Cost	$842,231	$672,139	$675,426
Gross Unrealized Gains	21,037	11,500	8,582
Gross Unrealized Losses	-3,392	-12,246	-14,624
Estimated Fair Value	859,876	671,393	669,384
Obligations of State and Political Subdivisions [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Amortized Cost	572,070	432,362	438,390
Gross Unrealized Gains	16,610	7,423	6,230
Gross Unrealized Losses	-1,101	-8,217	-8,631
Estimated Fair Value	587,579	431,568	435,989
U.S. Government Agency Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Amortized Cost	251,926	225,263	222,510
Gross Unrealized Gains	4,427	4,077	2,352
Gross Unrealized Losses	-2,291	-4,029	-5,993
Estimated Fair Value	254,062	225,311	218,869
Corporate Obligations [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Amortized Cost	655	717	716
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	0
Estimated Fair Value	655	717	716
Other Equity Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Amortized Cost	17,580	13,797	13,810
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	0	0	0
Estimated Fair Value	$17,580	$13,797	$13,810

Investment_Securities_Gross_Un

Investment Securities - Gross Unrealized Losses and Estimated Fair Value of Investment Securities (Detail) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months	$85,344	$183,475	$259,842
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months	372	11,552	13,230
Total temporarily impaired investment securities, Estimated Fair Value, 12 Months or More	111,238	8,020	10,823
Total temporarily impaired investment securities, Unrealized Losses, 12 Months or More	3,020	694	1,394
Total temporarily impaired securities, Estimated Fair Value, Total	196,582	191,495	270,665
Total temporarily impaired securities, Unrealized Losses, Total	3,392	12,246	14,624
Obligations of State and Political Subdivisions [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months	40,386	122,614	132,568
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months	146	7,523	7,237
Total temporarily impaired investment securities, Estimated Fair Value, 12 Months or More	53,628	8,020	10,823
Total temporarily impaired investment securities, Unrealized Losses, 12 Months or More	955	694	1,394
Total temporarily impaired securities, Estimated Fair Value, Total	94,014	130,634	143,391
Total temporarily impaired securities, Unrealized Losses, Total	1,101	8,217	8,631
U.S. Government Agency Securities [Member]	'	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'	'
Total temporarily impaired investment securities, Estimated Fair Value, Less than 12 Months	44,958	60,861	127,274
Total temporarily impaired investment securities, Unrealized Losses, Less than 12 Months	226	4,029	5,993
Total temporarily impaired investment securities, Estimated Fair Value, 12 Months or More	57,610	0	0
Total temporarily impaired investment securities, Unrealized Losses, 12 Months or More	2,065	0	0
Total temporarily impaired securities, Estimated Fair Value, Total	102,568	60,861	127,274
Total temporarily impaired securities, Unrealized Losses, Total	$2,291	$4,029	$5,993

Investment_Securities_Maturity

Investment Securities - Maturity Distribution of Investment Securities AFS Reported at Amortized Cost and Estimated Fair Value (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Investments, Debt and Equity Securities [Abstract]	'
Amortized Cost, One year or less	$37,664
Amortized Cost, After one year to five years	138,870
Amortized Cost, After five years to ten years	194,325
Amortized Cost, After ten years	471,372
Total, Amortized Cost	842,231
Estimated Fair Value, One year or less	38,291
Estimated Fair Value, After one year to five years	140,563
Estimated Fair Value, After five years to ten years	196,655
Estimated Fair Value, After ten years	484,367
Total, Estimated Fair Value	$859,876

Investment_Securities_Sales_Ac

Investment Securities - Sales Activities of Company's Investment Securities AFS are Summarized (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Investments, Debt and Equity Securities [Abstract]	'	'	'	'
Sales proceeds	$6,563	$0	$54,957	$999
Gross realized gains	58	0	82	156
Gross realized losses	-15	0	-15	0
Net gains on investment securities	$43	$0	$67	$156

Allowance_for_Loan_and_Lease_L2

Allowance for Loan and Lease Losses ("ALLL") - Schedule of Activity Within Allowance for Loan and Lease Losses (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Beginning balance	$46,958	$39,372	$42,945	$38,738
Non-purchased loans and leases charged off	-737	-754	-3,306	-3,203
Recoveries of non-purchased loans and leases previously charged off	185	142	1,167	925
Net charge-offs	-1,039	-1,530	-3,913	-6,290
Total provision	3,687	3,818	10,574	9,212
Ending balance	49,606	41,660	49,606	41,660
Non Purchase Loan [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Net charge-offs	-552	-612	-2,139	-2,278
Total provision	3,200	2,900	8,800	5,200
Covered Loans [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Net charge-offs	-205	-918	-925	-4,012
Total provision	205	918	925	4,012
Non-Covered Loans [Member]	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'
Net charge-offs	-282	0	-849	0
Total provision	$282	$0	$849	$0

Allowance_for_Loan_and_Lease_L3

Allowance for Loan and Lease Losses ("ALLL") - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'	'	'	'
Partial charge-offs, net of adjustments to FDIC loss share receivable and FDIC clawback payable	$200,000	$900,000	$900,000	$4,000,000	'	'	'	'
Provision for covered loan and lease losses	200,000	900,000	900,000	4,000,000	'	'	'	'
Impaired covered loans	13,634,000	52,575,000	13,634,000	52,575,000	'	46,179,000	'	'
Net charge-offs	1,039,000	1,530,000	3,913,000	6,290,000	'	'	'	'
Provision for recorded loan and lease	3,687,000	3,818,000	10,574,000	9,212,000	'	'	'	'
Impaired purchased non-covered loans	1,657,000	'	1,657,000	'	'	'	'	'
Allowance for Loan and Lease Losses	49,606,000	41,660,000	49,606,000	41,660,000	46,958,000	42,945,000	39,372,000	38,738,000
Purchase Non-Covered Loans	1,030,988,000	399,058,000	1,030,988,000	399,058,000	'	372,723,000	'	'
Non-Covered Loans [Member]	'	'	'	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'	'	'	'
Net charge-offs	282,000	0	849,000	0	'	'	'	'
Provision for recorded loan and lease	282,000	0	849,000	0	'	'	'	'
FV 77 or FV 88 [Member]	'	'	'	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'	'	'	'
Purchase Non-Covered Loans	0	0	0	0	'	0	'	'
Covered Loans [Member]	'	'	'	'	'	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'	'	'	'	'	'
Allowance for Loan and Lease Losses	$0	$0	$0	$0	$0	$0	$0	$0

Allowance_for_Loan_and_Lease_L4

Allowance for Loan and Lease Losses ("ALLL") - Summary of Company's Allowance for Loan and Lease Losses (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	$46,958	$39,372	$42,945	$38,738	$38,738
Charge-offs	-1,224	-1,672	-5,080	-7,215	-9,002
Recoveries	185	142	1,167	925	1,134
Provision	3,687	3,818	10,574	9,212	12,075
Ending balance	49,606	41,660	49,606	41,660	42,945
Real estate [Member] | Residential 1-4 family [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	4,760	4,653	4,701	4,820	4,820
Charge-offs	-115	-111	-456	-528	-837
Recoveries	47	11	118	113	106
Provision	610	294	939	442	612
Ending balance	5,302	4,847	5,302	4,847	4,701
Real estate [Member] | Non-farm/non-residential [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	14,836	12,464	13,633	10,107	10,107
Charge-offs	-90	-19	-1,344	-612	-1,111
Recoveries	15	0	19	118	122
Provision	3,267	304	5,720	3,136	4,515
Ending balance	18,028	12,749	18,028	12,749	13,633
Real estate [Member] | Construction/land development [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	15,464	11,290	12,306	12,000	12,000
Charge-offs	0	-7	-14	-136	-137
Recoveries	4	13	12	21	174
Provision	-950	1,434	2,214	845	269
Ending balance	14,518	12,730	14,518	12,730	12,306
Real estate [Member] | Agricultural [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	2,908	2,595	3,000	2,878	2,878
Charge-offs	-198	-260	-213	-260	-261
Recoveries	2	5	13	9	14
Provision	-98	182	-186	-105	369
Ending balance	2,614	2,522	2,614	2,522	3,000
Real estate [Member] | Multifamily residential [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	1,772	1,854	2,504	2,030	2,030
Charge-offs	0	0	0	0	-4
Recoveries	0	0	0	0	4
Provision	-161	203	-893	27	474
Ending balance	1,611	2,057	1,611	2,057	2,504
Commercial and industrial [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	2,848	2,929	2,855	3,655	3,655
Charge-offs	-55	-55	-477	-887	-922
Recoveries	38	56	801	431	433
Provision	108	-172	-240	-441	-311
Ending balance	2,939	2,758	2,939	2,758	2,855
Consumer [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	926	993	917	1,015	1,015
Charge-offs	-29	-57	-126	-176	-214
Recoveries	14	19	50	90	104
Provision	-89	-13	-19	13	12
Ending balance	822	942	822	942	917
Direct Financing Leases [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	2,572	2,041	2,266	2,050	2,050
Charge-offs	-151	-152	-418	-338	-482
Recoveries	29	9	43	29	33
Provision	371	262	930	419	665
Ending balance	2,821	2,160	2,821	2,160	2,266
Other [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	872	553	763	183	183
Charge-offs	-99	-93	-258	-266	-359
Recoveries	36	29	111	114	144
Provision	142	406	335	864	795
Ending balance	951	895	951	895	763
Covered Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	0	0	0	0	0
Charge-offs	-205	-918	-925	-4,012	-4,675
Recoveries	0	0	0	0	0
Provision	205	918	925	4,012	4,675
Ending balance	0	0	0	0	0
Purchased Non-Covered Loans [Member]	'	'	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'	'	'
Beginning balance	0	'	0	'	'
Charge-offs	-282	'	-849	'	'
Recoveries	0	'	0	'	'
Provision	282	'	849	'	'
Ending balance	$0	'	$0	'	'

Allowance_for_Loan_and_Lease_L5

Allowance for Loan and Lease Losses ("ALLL") - Summary of Allowance for Loan and Lease Losses and Recorded Investment in Loans and Leases, Excluding Loans Covered by FDIC (Detail) (USD $)	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	$1,010	'	$1,341	$1,303	'	'
Total ALLL	49,606	46,958	42,945	41,660	39,372	38,738
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	15,845	'	8,087	9,377	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	3,623,297	'	2,624,478	2,513,212	'	'
Total Loans and Leases	3,639,142	'	2,632,565	2,522,589	'	'
Real estate [Member] | Residential 1-4 family [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	345	'	438	490	'	'
Total ALLL	5,302	4,760	4,701	4,847	4,653	4,820
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	2,360	'	4,047	3,535	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	275,981	'	245,509	247,491	'	'
Total Loans and Leases	278,341	'	249,556	251,026	'	'
Real estate [Member] | Non-farm/non-residential [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	24	'	15	6	'	'
Total ALLL	18,028	14,836	13,633	12,749	12,464	10,107
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	2,300	'	2,159	3,572	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	1,370,994	'	1,101,955	1,032,046	'	'
Total Loans and Leases	1,373,294	'	1,104,114	1,035,618	'	'
Real estate [Member] | Construction/land development [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	2	'	2	2	'	'
Total ALLL	14,518	15,464	12,306	12,730	11,290	12,000
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	10,191	'	236	217	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	1,223,062	'	722,321	713,981	'	'
Total Loans and Leases	1,233,253	'	722,557	714,198	'	'
Real estate [Member] | Agricultural [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	30	'	229	187	'	'
Total ALLL	2,614	2,908	3,000	2,522	2,595	2,878
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	376	'	883	951	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	46,345	'	44,313	47,002	'	'
Total Loans and Leases	46,721	'	45,196	47,953	'	'
Real estate [Member] | Multifamily residential [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	0	'	0	0	'	'
Total ALLL	1,611	1,772	2,504	2,057	1,854	2,030
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	0	'	0	310	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	155,940	'	208,337	163,606	'	'
Total Loans and Leases	155,940	'	208,337	163,916	'	'
Commercial and industrial [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	606	'	652	613	'	'
Total ALLL	2,939	2,848	2,855	2,758	2,929	3,655
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	578	'	686	739	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	312,714	'	123,382	121,424	'	'
Total Loans and Leases	313,292	'	124,068	122,163	'	'
Consumer [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	3	'	3	4	'	'
Total ALLL	822	926	917	942	993	1,015
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	32	'	50	33	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	25,367	'	26,132	27,265	'	'
Total Loans and Leases	25,399	'	26,182	27,298	'	'
Direct Financing Leases [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	0	'	0	0	'	'
Total ALLL	2,821	2,572	2,266	2,160	2,041	2,050
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	0	'	0	0	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	109,059	'	86,321	81,984	'	'
Total Loans and Leases	109,059	'	86,321	81,984	'	'
Other [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Allowance for Non-Purchased Loan and Lease Losses ALLL for Individually Evaluated Impaired Loans and Leases	0	'	2	1	'	'
Total ALLL	951	872	763	895	553	183
Non-Purchased Loans and Leases - Individually Evaluated Impaired Loans and Leases	8	'	26	20	'	'
Non-Purchased Loans and Leases - All Other Loans and Leases	103,835	'	66,208	78,413	'	'
Total Loans and Leases	103,843	'	66,234	78,433	'	'
ALLL For All Other Loans And Leases [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	48,596	'	41,604	40,357	'	'
ALLL For All Other Loans And Leases [Member] | Real estate [Member] | Residential 1-4 family [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	4,957	'	4,263	4,357	'	'
ALLL For All Other Loans And Leases [Member] | Real estate [Member] | Non-farm/non-residential [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	18,004	'	13,618	12,743	'	'
ALLL For All Other Loans And Leases [Member] | Real estate [Member] | Construction/land development [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	14,516	'	12,304	12,728	'	'
ALLL For All Other Loans And Leases [Member] | Real estate [Member] | Agricultural [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	2,584	'	2,771	2,335	'	'
ALLL For All Other Loans And Leases [Member] | Real estate [Member] | Multifamily residential [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	1,611	'	2,504	2,057	'	'
ALLL For All Other Loans And Leases [Member] | Commercial and industrial [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	2,333	'	2,203	2,145	'	'
ALLL For All Other Loans And Leases [Member] | Consumer [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	819	'	914	938	'	'
ALLL For All Other Loans And Leases [Member] | Direct Financing Leases [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	2,821	'	2,266	2,160	'	'
ALLL For All Other Loans And Leases [Member] | Other [Member]	'	'	'	'	'	'
Allowance For Loan And Lease Losses [Line Items]	'	'	'	'	'	'
Total ALLL	$951	'	$761	$894	'	'

Allowance_for_Loan_and_Lease_L6

Allowance for Loan and Lease Losses ("ALLL") - Schedule of Impaired Non-purchased Loans and Leases, FDIC Loss Share Agreements (Detail) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	$20,215	$15,542	$20,215	$15,542	$13,700
Net Charge-offs to Date	-4,370	-6,165	-4,370	-6,165	-5,613
Principal Balance, Net of Charge-offs	15,845	9,377	15,845	9,377	8,087
Specific Allowance	1,010	1,303	1,010	1,303	1,341
Weighted Average Carrying Value	16,636	12,234	12,154	10,205	9,781
Impaired Financing Receivable With Related Allowances [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	4,966	6,680	4,966	6,680	6,513
Net Charge-offs to Date	-2,752	-3,679	-2,752	-3,679	-3,417
Principal Balance, Net of Charge-offs	2,214	3,001	2,214	3,001	3,096
Specific Allowance	1,010	1,303	1,010	1,303	1,341
Weighted Average Carrying Value	2,378	2,656	2,575	2,802	2,860
Impaired Financing Receivable With Related Allowances [Member] | Real estate [Member] | Residential 1-4 family [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	2,984	3,601	2,984	3,601	3,609
Net Charge-offs to Date	-1,654	-1,662	-1,654	-1,662	-1,692
Principal Balance, Net of Charge-offs	1,330	1,939	1,330	1,939	1,917
Specific Allowance	345	490	345	490	438
Weighted Average Carrying Value	1,452	1,624	1,564	1,569	1,638
Impaired Financing Receivable With Related Allowances [Member] | Real estate [Member] | Non-farm/non-residential [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	415	37	415	37	121
Net Charge-offs to Date	-216	0	-216	0	-75
Principal Balance, Net of Charge-offs	199	37	199	37	46
Specific Allowance	24	6	24	6	15
Weighted Average Carrying Value	121	24	87	105	93
Impaired Financing Receivable With Related Allowances [Member] | Real estate [Member] | Construction/land development [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	36	129	36	129	38
Net Charge-offs to Date	-22	-112	-22	-112	-22
Principal Balance, Net of Charge-offs	14	17	14	17	16
Specific Allowance	2	2	2	2	2
Weighted Average Carrying Value	16	8	16	17	17
Impaired Financing Receivable With Related Allowances [Member] | Real estate [Member] | Agricultural [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	116	459	116	459	511
Net Charge-offs to Date	-12	-42	-12	-42	-42
Principal Balance, Net of Charge-offs	104	417	104	417	469
Specific Allowance	30	187	30	187	229
Weighted Average Carrying Value	214	421	311	525	514
Impaired Financing Receivable With Related Allowances [Member] | Commercial and industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	1,314	2,270	1,314	2,270	2,016
Net Charge-offs to Date	-764	-1,713	-764	-1,713	-1,405
Principal Balance, Net of Charge-offs	550	557	550	557	611
Specific Allowance	606	613	606	613	652
Weighted Average Carrying Value	555	558	571	570	578
Impaired Financing Receivable With Related Allowances [Member] | Consumer [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	101	39	101	39	178
Net Charge-offs to Date	-84	-13	-84	-13	-156
Principal Balance, Net of Charge-offs	17	26	17	26	22
Specific Allowance	3	4	3	4	3
Weighted Average Carrying Value	20	13	22	7	10
Impaired Financing Receivable With Related Allowances [Member] | Other [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	0	145	0	145	40
Net Charge-offs to Date	0	-137	0	-137	-25
Principal Balance, Net of Charge-offs	0	8	0	8	15
Specific Allowance	0	1	0	1	2
Weighted Average Carrying Value	0	8	4	9	10
Impaired Financing Receivable With No Related Allowances [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	15,249	8,862	15,249	8,862	7,187
Net Charge-offs to Date	-1,618	-2,486	-1,618	-2,486	-2,196
Principal Balance, Net of Charge-offs	13,631	6,376	13,631	6,376	4,991
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	14,258	9,578	9,579	7,403	6,921
Impaired Financing Receivable With No Related Allowances [Member] | Real estate [Member] | Residential 1-4 family [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	1,343	2,244	1,343	2,244	2,939
Net Charge-offs to Date	-313	-648	-313	-648	-808
Principal Balance, Net of Charge-offs	1,030	1,596	1,030	1,596	2,131
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	1,352	1,507	1,802	1,394	1,541
Impaired Financing Receivable With No Related Allowances [Member] | Real estate [Member] | Non-farm/non-residential [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	2,826	4,645	2,826	4,645	3,234
Net Charge-offs to Date	-725	-1,110	-725	-1,110	-1,120
Principal Balance, Net of Charge-offs	2,101	3,535	2,101	3,535	2,114
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	2,210	6,957	2,025	4,902	4,344
Impaired Financing Receivable With No Related Allowances [Member] | Real estate [Member] | Construction/land development [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	10,258	281	10,258	281	300
Net Charge-offs to Date	-81	-81	-81	-81	-81
Principal Balance, Net of Charge-offs	10,177	200	10,177	200	219
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	9,949	236	5,107	324	303
Impaired Financing Receivable With No Related Allowances [Member] | Real estate [Member] | Agricultural [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	474	801	474	801	426
Net Charge-offs to Date	-202	-267	-202	-267	-12
Principal Balance, Net of Charge-offs	272	534	272	534	414
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	397	386	419	401	404
Impaired Financing Receivable With No Related Allowances [Member] | Real estate [Member] | Multifamily residential [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	133	443	133	443	133
Net Charge-offs to Date	-133	-133	-133	-133	-133
Principal Balance, Net of Charge-offs	0	310	0	310	0
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	246	311	123	155	124
Impaired Financing Receivable With No Related Allowances [Member] | Commercial and industrial [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	187	397	187	397	85
Net Charge-offs to Date	-159	-215	-159	-215	-10
Principal Balance, Net of Charge-offs	28	182	28	182	75
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	79	166	73	196	172
Impaired Financing Receivable With No Related Allowances [Member] | Consumer [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	20	19	20	19	39
Net Charge-offs to Date	-5	-12	-5	-12	-12
Principal Balance, Net of Charge-offs	15	7	15	7	27
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	17	7	21	23	24
Impaired Financing Receivable With No Related Allowances [Member] | Other [Member]	'	'	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'	'	'
Principal Balance	8	32	8	32	31
Net Charge-offs to Date	0	-20	0	-20	-20
Principal Balance, Net of Charge-offs	8	12	8	12	11
Specific Allowance	0	0	0	0	0
Weighted Average Carrying Value	$8	$8	$9	$8	$9

Allowance_for_Loan_and_Lease_L7

Allowance for Loan and Lease Losses ("ALLL") - Summary of Credit Quality Indicators for Loans and Leases, Including Covered and Non-Covered Loans and Leases (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	$3,639,142	$2,632,565	$2,522,589
Loans covered by FDIC loss share agreements ("covered loans")	248,802	351,791	409,319
Total purchase Non-Covered Loans	1,030,988	372,723	399,058
Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	248,802	351,791	409,319
Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	357,541	92,119	100,387
Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	385,349	137,938	139,958
Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	91,407	52,526	59,345
Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	128,837	49,510	55,884
Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	729	0	0
Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	66,197	40,630	43,484
Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	928	0	0
Satisfactory [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	3,099,606	2,167,775	2,056,383
Moderate [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	421,100	350,449	344,268
Watch [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	87,120	91,294	93,374
Substandard [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	31,316	23,047	28,564
FV 1 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	235,168	305,612	356,744
FV 2 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	13,634	46,179	52,575
Real estate [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	915,081	336,394	355,307
Real estate [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	278,341	249,556	251,026
Total purchase Non-Covered Loans	279,273	131,085	136,723
Real estate [Member] | Residential 1-4 family [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	88,275	111,053	120,541
Real estate [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	1,373,294	1,104,114	1,035,618
Total purchase Non-Covered Loans	462,384	152,948	163,724
Real estate [Member] | Non-farm/non-residential [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	113,633	163,708	197,452
Real estate [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	1,233,253	722,557	714,198
Total purchase Non-Covered Loans	94,337	25,633	26,778
Real estate [Member] | Construction/land development [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	27,618	47,742	59,387
Real estate [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	46,721	45,196	47,953
Total purchase Non-Covered Loans	44,408	9,518	10,080
Real estate [Member] | Agricultural [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	9,877	11,150	12,341
Real estate [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	155,940	208,337	163,916
Total purchase Non-Covered Loans	34,679	17,210	18,002
Real estate [Member] | Multifamily residential [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	3,828	9,166	9,368
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	326,514	80,312	86,390
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	74,617	27,111	28,486
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	200,653	42,193	46,201
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	28,857	5,930	5,973
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	12,510	1,547	2,109
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	9,877	3,531	3,621
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	348,451	125,170	126,695
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	81,344	32,259	34,113
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	194,295	72,621	71,637
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	33,070	8,106	8,578
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	26,723	6,619	6,705
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	13,019	5,565	5,662
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	82,763	49,948	55,851
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	30,058	21,035	21,592
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	32,819	20,685	25,591
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	9,607	2,137	2,495
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	3,053	823	851
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	7,226	5,268	5,322
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	95,754	42,600	45,561
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	75,815	35,733	36,221
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	3,283	1,191	3,509
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	13,783	4,553	4,680
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	1,933	164	173
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	940	959	978
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	729	0	0
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	143	0	0
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	505	0	0
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	9	0	0
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Real estate [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	72	0	0
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	59,942	38,364	40,810
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	17,236	14,947	16,311
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	30,742	16,258	16,786
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	9,011	4,907	5,052
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	189	365	242
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	2,764	1,887	2,419
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	928	0	0
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	60	0	0
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	87	0	0
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Real estate [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	781	0	0
Real estate [Member] | Satisfactory [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	268,707	239,940	242,202
Real estate [Member] | Satisfactory [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	1,170,334	916,304	839,345
Real estate [Member] | Satisfactory [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	1,016,496	550,436	544,324
Real estate [Member] | Satisfactory [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	24,335	21,647	23,926
Real estate [Member] | Satisfactory [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	119,765	177,144	132,722
Real estate [Member] | Moderate [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	0	0	0
Real estate [Member] | Moderate [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	141,395	128,624	134,754
Real estate [Member] | Moderate [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	186,496	144,435	136,270
Real estate [Member] | Moderate [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	10,202	11,098	11,688
Real estate [Member] | Moderate [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	35,039	30,029	29,716
Real estate [Member] | Watch [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	3,797	3,140	1,438
Real estate [Member] | Watch [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	54,078	52,388	51,589
Real estate [Member] | Watch [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	16,979	23,574	29,122
Real estate [Member] | Watch [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	10,062	9,788	9,317
Real estate [Member] | Watch [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	382	391	394
Real estate [Member] | Substandard [Member] | Residential 1-4 family [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	5,837	6,476	7,386
Real estate [Member] | Substandard [Member] | Non-farm/non-residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	7,487	6,798	9,930
Real estate [Member] | Substandard [Member] | Construction/land development [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	13,282	4,112	4,482
Real estate [Member] | Substandard [Member] | Agricultural [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	2,122	2,663	3,022
Real estate [Member] | Substandard [Member] | Multifamily residential [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	754	773	1,084
Real estate [Member] | FV 1 [Member] | Residential 1-4 family [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	86,067	105,218	114,163
Real estate [Member] | FV 1 [Member] | Non-farm/non-residential [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	107,046	138,573	171,886
Real estate [Member] | FV 1 [Member] | Construction/land development [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	23,970	33,475	40,172
Real estate [Member] | FV 1 [Member] | Agricultural [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	9,539	10,807	11,203
Real estate [Member] | FV 1 [Member] | Multifamily residential [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	3,513	8,709	9,153
Real estate [Member] | FV 2 [Member] | Residential 1-4 family [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	2,208	5,835	6,378
Real estate [Member] | FV 2 [Member] | Non-farm/non-residential [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	6,587	25,135	25,566
Real estate [Member] | FV 2 [Member] | Construction/land development [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	3,648	14,267	19,215
Real estate [Member] | FV 2 [Member] | Agricultural [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	338	343	1,138
Real estate [Member] | FV 2 [Member] | Multifamily residential [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	315	457	215
Commercial and industrial [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	313,292	124,068	122,163
Total purchase Non-Covered Loans	76,701	24,934	30,229
Commercial and industrial [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	5,354	8,719	9,934
Commercial and industrial [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	23,424	9,592	10,684
Commercial and industrial [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	27,645	9,730	10,793
Commercial and industrial [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	7,282	2,250	3,150
Commercial and industrial [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	13,284	1,879	4,004
Commercial and industrial [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Commercial and industrial [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	5,066	1,483	1,598
Commercial and industrial [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Commercial and industrial [Member] | Satisfactory [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	267,178	87,568	91,913
Commercial and industrial [Member] | Moderate [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	43,286	33,071	26,843
Commercial and industrial [Member] | Watch [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	1,347	1,664	1,210
Commercial and industrial [Member] | Substandard [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	1,481	1,765	2,197
Commercial and industrial [Member] | FV 1 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	4,819	8,582	9,877
Commercial and industrial [Member] | FV 2 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	535	137	57
Consumer [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	25,399	26,182	27,298
Total purchase Non-Covered Loans	20,461	6,855	9,176
Consumer [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	64	111	138
Consumer [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	2,498	1,013	1,980
Consumer [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	884	141	147
Consumer [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	627	171	181
Consumer [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	16,023	4,794	5,990
Consumer [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Consumer [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	429	736	878
Consumer [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Consumer [Member] | Satisfactory [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	24,879	25,574	26,763
Consumer [Member] | Moderate [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	0	0	0
Consumer [Member] | Watch [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	263	230	172
Consumer [Member] | Substandard [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	257	378	363
Consumer [Member] | FV 1 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	61	106	132
Consumer [Member] | FV 2 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	3	5	6
Direct Financing Leases [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	109,059	86,321	81,984
Direct Financing Leases [Member] | Satisfactory [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	108,126	85,363	80,967
Direct Financing Leases [Member] | Moderate [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	829	955	992
Direct Financing Leases [Member] | Watch [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	32	0	0
Direct Financing Leases [Member] | Substandard [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	72	3	25
Other [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	103,843	66,234	78,433
Total purchase Non-Covered Loans	18,745	4,540	4,346
Other [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	153	142	158
Other [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 33 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	5,105	1,202	1,333
Other [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 44 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	8,369	2,897	2,323
Other [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 55 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	735	157	163
Other [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 36 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	3,776	237	329
Other [Member] | Purchased Non-Covered Loans Without Evidence of Credit Deterioration at Acquisition [Member] | FV 77 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Other [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 66 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	760	47	198
Other [Member] | Purchased Non-Covered Loans With Evidence of Credit Deterioration at Acquisition [Member] | FV 88 [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total purchase Non-Covered Loans	0	0	0
Other [Member] | Satisfactory [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	99,786	63,799	74,221
Other [Member] | Moderate [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	3,853	2,237	4,005
Other [Member] | Watch [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	180	119	132
Other [Member] | Substandard [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Total Loans and Leases	24	79	75
Other [Member] | FV 1 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	153	142	158
Other [Member] | FV 2 [Member] | Covered Loans [Member]	'	'	'
Loans And Leases [Line Items]	'	'	'
Loans covered by FDIC loss share agreements ("covered loans")	$0	$0	$0

Allowance_for_Loan_and_Lease_L8

Allowance for Loan and Lease Losses ("ALLL") - Schedule of Aging Analysis Past Due Loans and Leases, Loans Covered & Non-Covered by FDIC Loss Share Agreements (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	$9,630	$8,543	$6,620
90 Days or More	12,934	4,697	6,927
Total Past Due	22,564	13,240	13,547
Current	3,616,578	2,619,325	2,509,042
Total Loans and Leases	3,639,142	2,632,565	2,522,589
Total Covered Loans	248,802	351,791	409,319
Total Purchased Non-Covered Loans	1,030,988	372,723	399,058
Purchased Non-Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	9,858	13,346	12,828
90 Days or More	18,978	16,435	17,517
Total Past Due	28,836	29,781	30,345
Current	1,002,152	342,942	368,713
Total Purchased Non-Covered Loans	1,030,988	372,723	399,058
Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	7,497	15,695	17,121
90 Days or More	22,673	72,354	88,985
Total Past Due	30,170	88,049	106,106
Current	218,632	263,742	303,213
Total Covered Loans	248,802	351,791	409,319
Real estate [Member] | Residential 1-4 family [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	4,203	4,228	1,661
90 Days or More	1,230	2,004	2,376
Total Past Due	5,433	6,232	4,037
Current	272,908	243,324	246,989
Total Loans and Leases	278,341	249,556	251,026
Real estate [Member] | Non-farm/non-residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	879	2,093	2,321
90 Days or More	1,432	1,867	3,312
Total Past Due	2,311	3,960	5,633
Current	1,370,983	1,100,154	1,029,985
Total Loans and Leases	1,373,294	1,104,114	1,035,618
Real estate [Member] | Construction/land development [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	1,854	235	1,662
90 Days or More	10,017	153	136
Total Past Due	11,871	388	1,798
Current	1,221,382	722,169	712,400
Total Loans and Leases	1,233,253	722,557	714,198
Real estate [Member] | Agricultural [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	1,574	517	322
90 Days or More	192	540	571
Total Past Due	1,766	1,057	893
Current	44,955	44,139	47,060
Total Loans and Leases	46,721	45,196	47,953
Real estate [Member] | Multifamily residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	0	773	0
90 Days or More	0	0	310
Total Past Due	0	773	310
Current	155,940	207,564	163,606
Total Loans and Leases	155,940	208,337	163,916
Real estate [Member] | Purchased Non-Covered Loans [Member] | Residential 1-4 family [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	6,026	6,615	4,026
90 Days or More	6,220	4,703	3,647
Total Past Due	12,246	11,318	7,673
Current	267,027	119,767	129,050
Total Purchased Non-Covered Loans	279,273	131,085	136,723
Real estate [Member] | Purchased Non-Covered Loans [Member] | Non-farm/non-residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	1,706	4,886	3,319
90 Days or More	9,449	5,779	4,136
Total Past Due	11,155	10,665	7,455
Current	451,229	142,283	156,269
Total Purchased Non-Covered Loans	462,384	152,948	163,724
Real estate [Member] | Purchased Non-Covered Loans [Member] | Construction/land development [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	855	265	4,601
90 Days or More	1,476	4,045	7,367
Total Past Due	2,331	4,310	11,968
Current	92,006	21,323	14,810
Total Purchased Non-Covered Loans	94,337	25,633	26,778
Real estate [Member] | Purchased Non-Covered Loans [Member] | Agricultural [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	211	134	0
90 Days or More	146	25	101
Total Past Due	357	159	101
Current	44,051	9,359	9,979
Total Purchased Non-Covered Loans	44,408	9,518	10,080
Real estate [Member] | Purchased Non-Covered Loans [Member] | Multifamily residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	0	421	177
90 Days or More	1,228	1,225	1,326
Total Past Due	1,228	1,646	1,503
Current	33,451	15,564	16,499
Total Purchased Non-Covered Loans	34,679	17,210	18,002
Real estate [Member] | Covered Loans [Member] | Residential 1-4 family [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	3,075	5,341	6,260
90 Days or More	7,298	12,409	13,658
Total Past Due	10,373	17,750	19,918
Current	77,902	93,303	100,623
Total Covered Loans	88,275	111,053	120,541
Real estate [Member] | Covered Loans [Member] | Non-farm/non-residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	3,481	6,954	8,557
90 Days or More	8,112	32,462	39,841
Total Past Due	11,593	39,416	48,398
Current	102,040	124,292	149,054
Total Covered Loans	113,633	163,708	197,452
Real estate [Member] | Covered Loans [Member] | Construction/land development [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	922	2,173	848
90 Days or More	5,008	20,914	27,584
Total Past Due	5,930	23,087	28,432
Current	21,688	24,655	30,955
Total Covered Loans	27,618	47,742	59,387
Real estate [Member] | Covered Loans [Member] | Agricultural [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	0	237	1,234
90 Days or More	1,652	1,328	1,250
Total Past Due	1,652	1,565	2,484
Current	8,225	9,585	9,857
Total Covered Loans	9,877	11,150	12,341
Real estate [Member] | Covered Loans [Member] | Multifamily residential [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	0	375	195
90 Days or More	0	3,240	3,689
Total Past Due	0	3,615	3,884
Current	3,828	5,551	5,484
Total Covered Loans	3,828	9,166	9,368
Commercial and industrial [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	813	418	349
90 Days or More	28	31	131
Total Past Due	841	449	480
Current	312,451	123,619	121,683
Total Loans and Leases	313,292	124,068	122,163
Commercial and industrial [Member] | Purchased Non-Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	791	614	357
90 Days or More	269	388	535
Total Past Due	1,060	1,002	892
Current	75,641	23,932	29,337
Total Purchased Non-Covered Loans	76,701	24,934	30,229
Commercial and industrial [Member] | Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	9	605	27
90 Days or More	603	2,001	2,961
Total Past Due	612	2,606	2,988
Current	4,742	6,113	6,946
Total Covered Loans	5,354	8,719	9,934
Consumer [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	295	261	177
90 Days or More	35	78	66
Total Past Due	330	339	243
Current	25,069	25,843	27,055
Total Loans and Leases	25,399	26,182	27,298
Consumer [Member] | Purchased Non-Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	196	411	310
90 Days or More	159	237	223
Total Past Due	355	648	533
Current	20,106	6,207	8,643
Total Purchased Non-Covered Loans	20,461	6,855	9,176
Consumer [Member] | Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	10	10	0
90 Days or More	0	0	2
Total Past Due	10	10	2
Current	54	101	136
Total Covered Loans	64	111	138
Direct Financing Leases [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	0	0	111
90 Days or More	0	0	25
Total Past Due	0	0	136
Current	109,059	86,321	81,848
Total Loans and Leases	109,059	86,321	81,984
Other [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	12	18	17
90 Days or More	0	24	0
Total Past Due	12	42	17
Current	103,831	66,192	78,416
Total Loans and Leases	103,843	66,234	78,433
Other [Member] | Purchased Non-Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	73	0	38
90 Days or More	31	33	182
Total Past Due	104	33	220
Current	18,641	4,507	4,126
Total Purchased Non-Covered Loans	18,745	4,540	4,346
Other [Member] | Covered Loans [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-89 Days Past Due	0	0	0
90 Days or More	0	0	0
Total Past Due	0	0	0
Current	153	142	158
Total Covered Loans	$153	$142	$158

Allowance_for_Loan_and_Lease_L9

Allowance for Loan and Lease Losses ("ALLL") - Schedule of Aging Analysis Past Due Loans and Leases, Loans Covered & Non-Covered by FDIC Loss Share Agreements (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
30-89 Days Past Due [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans and leases, excluding loans covered by FDIC loss share agreements, on nonaccrual status	$0.90	$0.80	$0.40
Non Accrual Loans Current [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
Loans and leases, excluding loans covered by FDIC loss share agreements, on nonaccrual status	$3.90	$3.20	$3.10

Income_Taxes_Types_of_Temporar

Income Taxes - Types of Temporary Differences Between Tax Basis of Assets and Liabilities (Detail) (USD $)	Sep. 30, 2014	Mar. 05, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Income Tax Disclosure [Abstract]	'	'	'	'
Allowance for loan and lease losses	$19,052	'	$16,576	$16,080
Differences in amounts reflected in financial statements and income tax basis of purchased non-covered loans	24,769	'	17,167	19,563
Stock-based compensation	3,811	'	2,400	2,724
Deferred compensation	1,962	'	1,775	1,792
Foreclosed assets	5,195	'	3,165	3,318
Investment securities AFS	0	'	5,056	3,116
Differences in amounts reflected in financial statements and income tax basis of assets acquired and liabilities assumed in FDIC-assisted acquisitions	8,708	'	3,424	607
Acquired net operating losses	13,976	'	7,509	7,905
Other, net	7,310	'	3,858	1,950
Total gross deferred tax assets	84,783	'	60,930	57,055
Less valuation allowance	-474	-500	0	0
Net deferred tax asset	84,309	'	60,930	57,055
Accelerated depreciation on premises and equipment	17,933	'	17,459	16,952
Investment securities AFS	5,499	'	0	0
Acquired intangible assets	10,466	'	4,227	4,390
Total gross deferred tax liabilities	33,898	'	21,686	21,342
Net deferred tax assets (liabilities)	$50,411	'	$39,244	$35,713

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)

Sep. 30, 2014

Mar. 05, 2014

Dec. 31, 2013

Sep. 30, 2013

Jul. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

First National Bank [Member]

First National Bank [Member]

First National Bank [Member]

Bancshares Inc [Member]

Bancshares Inc [Member]

Bancshares Inc [Member]

Summit [Member]

Expiration Year 2032 [Member]

Expiration Year 2033 [Member]

Year Three [Member]

Year Four [Member]

Schedule Of Income Taxes [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

Net operating losses carryforwards

'

'

'

'

'

$20,000,000

'

'

$16,400,000

'

'

$6,500,000

Operating loss carryforwards subject to expiration

'

'

'

'

'

'

12,500,000

7,500,000

16,400,000

'

'

6,500,000

Operating loss carryforwards expiration year

'

'

'

'

'

'

'2032

'2033

'

'2030

'2034

'2019

Deferred tax valuation allowance, initially established

'

'

'

'

4,100,000

4,100,000

'

'

'

'

'

'

Deferred tax valuation allowance

$474,000

$500,000

$0

$0

'

'

'

'

$500,000

'

'

'

Supplemental_Data_for_Cash_Flo2

Supplemental Data for Cash Flows - Schedule of Supplemental Cash Flow Information (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Statement of Cash Flows [Abstract]	'	'
Interest	$15,450	$14,038
Taxes	30,834	35,515
Net change in unrealized gains/losses on investment securities AFS	23,687	-18,488
Loans and other assets transferred to foreclosed assets not covered by FDIC loss share agreements	9,112	4,497
Loans advanced for sales of foreclosed assets not covered by FDIC loss share agreements	258	2,942
Covered loans transferred to covered foreclosed assets	30,754	24,306
Unsettled AFS investment security purchases	0	730
Common stock issued in merger and acquisition transactions	$166,402	$60,079

Guarantees_and_Commitments_Add

Guarantees and Commitments - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Guarantees And Commitments [Line Items]	'
Outstanding commitments to extend credit, excluding commitments to extend credit on loans covered by FDIC loss share agreements	$2,580,000,000
Commitments extend over varying periods of time, in months	'12 months
Commitments To Extend Credit [Member]	'
Guarantees And Commitments [Line Items]	'
Maximum amount of future payments required to make under guarantees	9,300,000
Collateralized commitments	$9,100,000

Guarantees_and_Commitments_Con

Guarantees and Commitments - Contractual Maturities (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Fair Value Disclosures [Abstract]	'
2014	$89,808
2015	209,595
2016	492,517
2017	1,259,690
2018	485,222
Thereafter	47,613
Total	$2,584,445

StockBased_Compensation_Additi

Stock-Based Compensation - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Stock-based compensation expense for stock options included in non-interest expense	$0.40	$0.40	$1.60	$1.30
Nonqualified Stock Option Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Employee options issued with a vesting period, years	'	'	'3 years	'
Employee options expire after issuance, years	'	'	'7 years	'
Number of shares available to non-employee directors through the non qualified stock option plan for non-employee directors	'	'	2,000	'
Expiration period of options issued to non-employee director	'	'	'10 years	'
Nonqualified Stock Option Plan [Member] | Director [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Number of shares available to non-employee directors through the non qualified stock option plan for non-employee directors	'	'	2,000	'
Employee Stock Option [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Total intrinsic value of options exercised during the period	'	'	5	4.7
Options to purchase split-adjusted shares, granted	'	'	52,000	48,000
Total unrecognized compensation expenses	2.2	'	2.2	'
Unrecognized compensation cost, weighted-average period, years	'	'1 year 9 months 18 days	'	'
Restricted Stock Plan [Member]	'	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'	'
Employee options issued with a vesting period, years	'	'	'3 years	'
Stock-based compensation expense for stock options included in non-interest expense	0.9	0.6	2.8	1.9
Total unrecognized compensation expenses	$5.10	'	$5.10	'
Unrecognized compensation cost, weighted-average period, years	'	'	'1 year 9 months 18 days	'
Restricted stock plan permitting issuance of restricted stock units, shares	1,600,000	'	1,600,000	'

StockBased_Compensation_Summar

Stock-Based Compensation - Summary of Stock Option Activity (Detail) (USD $)	9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'		'
Outstanding - January 1, 2014, Options	1,766,600		'
Granted, Options	52,000		'
Exercised, Options	-228,600		-356,800
Forfeited, Options	-48,800		'
Outstanding - September 30, 2014, Options	1,541,200		'
Fully vested and exercisable - September 30, 2014, Options	305,600		'
Expected to vest in future periods, Options	989,280		'
Fully vested and expected to vest - September 30, 2014, Options	1,294,880		'
Outstanding - January 1, 2014, Weighted-Average Exercise Price/Share	$15.84		'
Granted, Weighted-Average Exercise Price/Share	$29.05		'
Exercised, Weighted-Average Exercise Price/Share	$9.05		'
Forfeited, Weighted-Average Exercise Price/Share	$18.36		'
Outstanding - September 30, 2014, Weighted-Average Exercise Price/Share	$17.21		'
Fully vested and exercisable - September 30, 2014, Weighted-Average Exercise Price/Share	$13.65		'
Fully vested and expected to vest - September 30, 2014, Weighted-Average Exercise Price/Share	$17.04		'
Outstanding - September 30, 2014, Weighted-Average Remaining Contractual Life (in years)	'5 years 2 months 12 days		'
Fully vested and exercisable - September 30, 2014, Weighted-Average Remaining Contractual Life (in years)	'5 years 2 months 12 days		'
Fully vested and expected to vest - September 30, 2014, Weighted-Average Remaining Contractual Life (in years)	'5 years 2 months 12 days		'
Outstanding - September 30, 2014, Aggregate Intrinsic Value	$22,058		'
Fully vested and exercisable - September 30, 2014, Aggregate Intrinsic Value	5,460		'
Fully vested and expected to vest - September 30, 2014, Aggregate Intrinsic Value	$18,744	[1]	'
[1]	Based on closing price of $31.52 per share on September 30, 2014.

StockBased_Compensation_Summar1

Stock-Based Compensation - Summary of Stock Option Activity (Parenthetical) (Detail) (USD $)	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Estimated number of common shares that could be forfeited before the vesting date	246,320
Employee Stock Option [Member]	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'
Common stock, closing price, per share	31.52

StockBased_Compensation_Summar2

Stock-Based Compensation - Summary of Non-Vested Restricted Stock Activity (Detail) (USD $)	9 Months Ended
	Sep. 30, 2014
Disclosure Of Compensation Related Costs Sharebased Payments Restricted Stock [Abstract]	'
Outstanding - January 1, 2014	616,100
Granted	0
Forfeited	-1,200
Vested	0
Outstanding - September 30, 2014	614,900
Weighted-average grant date fair value	$17.99

Fair_Value_Measurements_Assets

Fair Value Measurements - Assets at Fair Value (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	$859,876	$669,384	$671,393
Total investment securities AFS	842,296	655,574	657,596
Impaired non-purchased loans and leases	14,835	6,746	8,074
Impaired covered loans	13,634	46,179	52,575
Impaired purchased non-covered loans	1,657	'	'
Foreclosed assets not covered by FDIC loss share agreements	14,781	11,851	11,647
Foreclosed assets covered by FDIC loss share agreements	27,882	37,960	40,452
Total assets at fair value	915,085	758,310	770,344
Obligations of State and Political Subdivisions [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	587,579	435,989	431,568
U.S. Government Agency Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	254,062	218,869	225,311
Corporate Obligations [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	655	716	717
Level 1 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Total investment securities AFS	0	0	0
Impaired non-purchased loans and leases	0	0	0
Impaired covered loans	0	0	0
Impaired purchased non-covered loans	0	'	'
Foreclosed assets not covered by FDIC loss share agreements	0	0	0
Foreclosed assets covered by FDIC loss share agreements	0	0	0
Total assets at fair value	0	0	0
Level 1 [Member] | Obligations of State and Political Subdivisions [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	0	0	0
Level 1 [Member] | U.S. Government Agency Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	0	0	0
Level 1 [Member] | Corporate Obligations [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	0	0	0
Level 2 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Total investment securities AFS	822,738	636,892	638,798
Impaired non-purchased loans and leases	0	0	0
Impaired covered loans	0	0	0
Impaired purchased non-covered loans	0	'	'
Foreclosed assets not covered by FDIC loss share agreements	0	0	0
Foreclosed assets covered by FDIC loss share agreements	0	0	0
Total assets at fair value	822,738	636,892	638,798
Level 2 [Member] | Obligations of State and Political Subdivisions [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	568,021	417,307	412,770
Level 2 [Member] | U.S. Government Agency Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	254,062	218,869	225,311
Level 2 [Member] | Corporate Obligations [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	655	716	717
Level 3 [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Total investment securities AFS	19,558	18,682	18,798
Impaired non-purchased loans and leases	14,835	6,746	8,074
Impaired covered loans	13,634	46,179	52,575
Impaired purchased non-covered loans	1,657	'	'
Foreclosed assets not covered by FDIC loss share agreements	14,781	11,851	11,647
Foreclosed assets covered by FDIC loss share agreements	27,882	37,960	40,452
Total assets at fair value	92,347	121,418	131,546
Level 3 [Member] | Obligations of State and Political Subdivisions [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	19,558	18,682	18,798
Level 3 [Member] | U.S. Government Agency Securities [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	0	0	0
Level 3 [Member] | Corporate Obligations [Member]	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'
Investment securities AFS	$0	$0	$0

Fair_Value_Measurements_Assets1

Fair Value Measurements - Assets at Fair Value (Parenthetical) (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'	'
Investments carried at cost	$17.60	$13.80	$13.80

Fair_Value_Measurements_Schedu

Fair Value Measurements - Schedule of Information Related to Level 3 Non-Recurring Fair Value Measurements (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Fair Value Measurements Disclosure [Line Items]	'	'	'
Impaired non-purchased loans and leases	$14,835	$6,746	$8,074
Impaired covered loans	13,634	46,179	52,575
Impaired purchased non-covered loans	1,657	'	'
Foreclosed assets not covered by FDIC loss share agreements	14,781	11,851	11,647
Foreclosed assets covered by FDIC loss share agreements	27,882	37,960	40,452
Level 3 [Member]	'	'	'
Fair Value Measurements Disclosure [Line Items]	'	'	'
Impaired non-purchased loans and leases	14,835	6,746	8,074
Impaired covered loans	13,634	46,179	52,575
Impaired purchased non-covered loans	1,657	'	'
Foreclosed assets not covered by FDIC loss share agreements	14,781	11,851	11,647
Foreclosed assets covered by FDIC loss share agreements	$27,882	$37,960	$40,452

Fair_Value_Measurements_Additi

Fair Value Measurements - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Fair value of private placement bonds	$19,600,000	$19,600,000	'	'
Third party pricing for private placement bonds	19,600,000	19,600,000	'	'
Carrying value of private placement bonds	19,600,000	19,600,000	'	'
Impaired financing receivable recorded investment reduction to estimated fair value	5,400,000	5,400,000	'	'
Estimated fair value of impaired loans and leases	14,800,000	14,800,000	'	'
Partial charge-offs to reduce carrying value of impaired loans and leases to estimated fair value	4,400,000	4,400,000	'	'
Specific loan and lease allocations to reduce carrying value of impaired loans and leases to estimated fair value	1,000,000	1,000,000	'	'
Partial charge-offs, net of adjustments to the FDIC loss share receivable and the FDIC clawback payable	200,000	900,000	'	'
Provision for loans and lease losses to cover charge-offs	200,000	900,000	'	'
Impaired covered loans	13,634,000	13,634,000	46,179,000	52,575,000
Impaired purchased non-covered loans partial charge-offs	300,000	900,000	'	'
Impaired purchased non-covered loans	1,657,000	1,657,000	'	'
Estimated cost to sell percentage, minimum	'	8.00%	'	'
Estimated cost to sell percentage, maximum	'	10.00%	'	'
Non Purchase Loan [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Carrying value of impaired non-purchased loans and leases	'	$5,400,000	'	'
Minimum [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Discount rate to determine the net present value of expected cash flows	'	6.00%	'	'
Discount rate of covered other real estate	'	8.00%	'	'
Minimum [Member] | Impaired Purchased Non Covered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Discount rate to determine the net present value of expected cash flows	'	6.00%	'	'
Maximum [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Discount rate to determine the net present value of expected cash flows	'	9.50%	'	'
Discount rate of covered other real estate	'	9.50%	'	'
Maximum [Member] | Impaired Purchased Non Covered Loans [Member]	'	'	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'	'	'
Discount rate to determine the net present value of expected cash flows	'	9.50%	'	'

Fair_Value_Measurements_Assets2

Fair Value Measurements - Assets Measured at Fair Value on Recurring Basis Utilizing Level 3 Inputs (Detail) (Investment Securities AFS [Member], USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Investment Securities AFS [Member]	'	'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'	'
Beginning Balance, Asset	$18,682	$104,172
Total realized gains (losses) included in earnings	0	0
Total unrealized gains (losses) included in comprehensive income	497	-1,940
Acquired	1,907	'
Paydowns and maturities	-672	-32,647
Sales	-856	0
Transfers in and/or out of Level 3	0	-50,787
Ending Balance, Asset	$19,558	$18,798

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments - Additional Information (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Millions, unless otherwise specified
Fair Value Disclosures [Abstract]	'	'	'
Investments in bank stock	$17.60	$13.80	$13.80

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments - Estimated Fair Values of Financial Instruments (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Investment securities AFS	$859,876	$669,384	$671,393
Time deposits	1,262,332	897,210	977,656
Other borrowings	352,616	280,895	280,905
FDIC clawback payable	26,676	25,897	25,705
Carrying Amount [Member] | Level 1 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Cash and cash equivalents	112,084	195,975	124,458
Demand, savings and interest bearing transaction deposits	3,877,373	2,819,817	2,677,030
Repurchase agreements with customers	73,942	53,103	50,254
Carrying Amount [Member] | Level 2 and 3 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Investment securities AFS	859,876	669,384	671,393
Carrying Amount [Member] | Level 3 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Loans and leases, net of ALLL	4,869,329	3,314,134	3,289,306
FDIC loss share receivable	36,583	71,854	89,642
FDIC clawback payable	26,676	25,897	25,705
Carrying Amount [Member] | Level 2 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Time deposits	1,262,332	897,210	977,656
Other borrowings	352,616	280,895	280,905
Subordinated debentures	64,950	64,950	64,950
Estimated Fair Value [Member] | Level 1 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Cash and cash equivalents	112,084	195,975	124,458
Demand, savings and interest bearing transaction deposits	3,877,373	2,819,817	2,677,030
Repurchase agreements with customers	73,942	53,103	50,254
Estimated Fair Value [Member] | Level 2 and 3 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Investment securities AFS	859,876	669,384	671,393
Estimated Fair Value [Member] | Level 3 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Loans and leases, net of ALLL	4,822,383	3,286,600	3,263,428
FDIC loss share receivable	36,130	71,770	89,617
FDIC clawback payable	26,676	25,897	25,705
Estimated Fair Value [Member] | Level 2 [Member]	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'
Time deposits	1,263,635	897,708	978,202
Other borrowings	373,696	319,650	322,171
Subordinated debentures	$33,452	$30,974	$30,815

Recovered_Sheet1

Changes in and Reclassifications from Accumulated Other Comprehensive Income ("AOCI") - Changes in Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance of AOCI - unrealized gains and losses on investment securities AFS	'	'	($3,672)	'
Total other comprehensive income (loss)	718	445	14,396	-11,236
Ending balance of AOCI - unrealized gains and losses on investment securities AFS	10,724	-453	10,724	-453
Unrealized gains and losses on investment securities AFS [Member]	'	'	'	'
Accumulated Other Comprehensive Income (Loss) [Line Items]	'	'	'	'
Beginning balance of AOCI - unrealized gains and losses on investment securities AFS	10,006	-898	-3,672	10,783
Other comprehensive income (loss) before reclassifications	744	445	14,437	-11,142
Amounts reclassified from AOCI	-26	0	-41	-94
Total other comprehensive income (loss)	718	445	14,396	-11,236
Ending balance of AOCI - unrealized gains and losses on investment securities AFS	$10,724	($453)	$10,724	($453)

Recovered_Sheet2

Changes in and Reclassifications from Accumulated Other Comprehensive Income ("AOCI") - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Equity [Abstract]	'	'	'	'
Amounts reclassified for net gains on investment securities	($43)	$0	($67)	($156)
Related tax effect	$17	$0	$26	$62