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Loans - Allowance for Loan Losses by Portfolio Segment and Related Recorded Investment in Loans (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance $ 128,762  
Ending balance: FDIC acquired loans 203,297 $ 252,409
Ending balance: Loans 15,703,314 13,895,276
Increase (decrease) in FDIC loss share receivable (2,800) (19,084)
Loans and Leases receivable, Allowance, Ending Balance 181,179 128,762
Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 128,762 133,626
Charge-offs (34,658) (39,499)
Recoveries 16,837 19,879
Net provision for loan losses 73,038 33,840
Increase (decrease) in FDIC loss share receivable (2,800) (19,084)
Loans and Leases receivable, Allowance, Ending Balance 181,179 128,762
Ending balance: Individually evaluated for impairment 20,988 854
Ending balance: Collectively evaluated for impairment 137,071 97,324
Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 23,120 30,584
Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 15,703,314 13,895,276
Ending balance: Individually evaluated for impairment 113,426 29,711
Ending balance: Collectively evaluated for impairment 15,364,050 13,551,889
Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 225,838 313,676
Commercial Non-Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 5,528 6,195
Ending balance: Loans 6,995,824 6,044,060
Commercial Non-Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 51,169 37,017
Charge-offs (8,361) (7,034)
Recoveries 5,046 3,532
Net provision for loan losses 61,298 19,247
Increase (decrease) in FDIC loss share receivable 276 (1,593)
Loans and Leases receivable, Allowance, Ending Balance 109,428 51,169
Ending balance: Individually evaluated for impairment 19,031 14
Ending balance: Collectively evaluated for impairment 89,951 50,244
Commercial Non-Real Estate [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 446 911
Commercial Non-Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 6,995,824 6,044,060
Ending balance: Individually evaluated for impairment 81,622 3,987
Ending balance: Collectively evaluated for impairment 6,902,198 6,025,432
Commercial Non-Real Estate [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 12,004 14,641
Construction and Land Development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 7,127 11,674
Ending balance: Loans 1,151,950 1,106,761
Construction and Land Development [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 6,421 8,845
Charge-offs (2,834) (4,918)
Recoveries 3,089 7,138
Net provision for loan losses (1,028) (215)
Increase (decrease) in FDIC loss share receivable (6) (4,429)
Loans and Leases receivable, Allowance, Ending Balance 5,642 6,421
Ending balance: Individually evaluated for impairment 392 19
Ending balance: Collectively evaluated for impairment 4,593 5,394
Construction and Land Development [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 657 1,008
Construction and Land Development [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 1,151,950 1,106,761
Ending balance: Individually evaluated for impairment 14,226 8,250
Ending balance: Collectively evaluated for impairment 1,125,621 1,067,156
Construction and Land Development [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 12,103 31,355
Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 15,582 27,808
Ending balance: Loans 3,412,551 3,144,048
Commercial Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 21,082 31,612
Charge-offs (4,225) (8,929)
Recoveries 3,397 3,119
Net provision for loan losses (4,878) (1,900)
Increase (decrease) in FDIC loss share receivable 523 (2,820)
Loans and Leases receivable, Allowance, Ending Balance 15,899 21,082
Ending balance: Individually evaluated for impairment 1,405 488
Ending balance: Collectively evaluated for impairment 12,687 16,533
Commercial Real Estate [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 1,807 4,061
Commercial Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 3,412,551 3,144,048
Ending balance: Individually evaluated for impairment 16,531 14,812
Ending balance: Collectively evaluated for impairment 3,369,396 3,071,651
Commercial Real Estate [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 26,624 57,585
Residential Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 162,241 187,033
Ending balance: Loans 2,049,524 1,894,181
Residential Mortgages [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 28,660 34,881
Charge-offs (2,407) (3,293)
Recoveries 771 645
Net provision for loan losses 1,734 2,501
Increase (decrease) in FDIC loss share receivable (3,405) (6,074)
Loans and Leases receivable, Allowance, Ending Balance 25,353 28,660
Ending balance: Individually evaluated for impairment 127 330
Ending balance: Collectively evaluated for impairment 7,563 7,721
Residential Mortgages [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 17,663 20,609
Residential Mortgages [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 2,049,524 1,894,181
Ending balance: Individually evaluated for impairment 895 2,656
Ending balance: Collectively evaluated for impairment 1,886,361 1,702,114
Residential Mortgages [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 162,268 189,411
Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 12,819 19,699
Ending balance: Loans 2,093,465 1,706,226
Consumer [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 21,430 21,271
Charge-offs (16,831) (15,325)
Recoveries 4,534 5,445
Net provision for loan losses 15,912 14,207
Increase (decrease) in FDIC loss share receivable (188) (4,168)
Loans and Leases receivable, Allowance, Ending Balance 24,857 21,430
Ending balance: Individually evaluated for impairment 33 3
Ending balance: Collectively evaluated for impairment 22,277 17,432
Consumer [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 2,547 3,995
Consumer [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 2,093,465 1,706,226
Ending balance: Individually evaluated for impairment 152 6
Ending balance: Collectively evaluated for impairment 2,080,474 1,685,536
Consumer [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 12,839 20,684
FDIC Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 203,297 252,409
FDIC Acquired Loans [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 30,584 53,094
Charge-offs (5,495) (7,997)
Recoveries 3,886 5,496
Net provision for loan losses (3,055) (925)
Increase (decrease) in FDIC loss share receivable (2,800) (19,084)
Loans and Leases receivable, Allowance, Ending Balance 23,120 30,584
FDIC Acquired Loans [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 23,120 30,584
FDIC Acquired Loans [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 203,297 252,409
FDIC Acquired Loans [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 203,297 252,409
FDIC Acquired Loans [Member] | Commercial Non-Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 5,528 6,195
FDIC Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 911 2,323
Charge-offs (1,427) (221)
Recoveries 1,704 485
Net provision for loan losses (1,018) (83)
Increase (decrease) in FDIC loss share receivable 276 (1,593)
Loans and Leases receivable, Allowance, Ending Balance 446 911
FDIC Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 446 911
FDIC Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 5,528 6,195
FDIC Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 5,528 6,195
FDIC Acquired Loans [Member] | Construction and Land Development [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 7,127 11,674
FDIC Acquired Loans [Member] | Construction and Land Development [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 1,008 2,655
Charge-offs (410) (148)
Recoveries 910 3,138
Net provision for loan losses (845) (208)
Increase (decrease) in FDIC loss share receivable (6) (4,429)
Loans and Leases receivable, Allowance, Ending Balance 657 1,008
FDIC Acquired Loans [Member] | Construction and Land Development [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 657 1,008
FDIC Acquired Loans [Member] | Construction and Land Development [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 7,127 11,674
FDIC Acquired Loans [Member] | Construction and Land Development [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 7,127 11,674
FDIC Acquired Loans [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 15,582 27,808
FDIC Acquired Loans [Member] | Commercial Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 4,061 10,929
Charge-offs (2,743) (5,350)
Recoveries 992 1,441
Net provision for loan losses (1,026) (139)
Increase (decrease) in FDIC loss share receivable 523 (2,820)
Loans and Leases receivable, Allowance, Ending Balance 1,807 4,061
FDIC Acquired Loans [Member] | Commercial Real Estate [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 1,807 4,061
FDIC Acquired Loans [Member] | Commercial Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 15,582 27,808
FDIC Acquired Loans [Member] | Commercial Real Estate [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 15,582 27,808
FDIC Acquired Loans [Member] | Residential Mortgages [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 162,241 187,033
FDIC Acquired Loans [Member] | Residential Mortgages [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 20,609 27,989
Charge-offs (772) (1,008)
Recoveries 84 1
Net provision for loan losses 1,147 (299)
Increase (decrease) in FDIC loss share receivable (3,405) (6,074)
Loans and Leases receivable, Allowance, Ending Balance 17,663 20,609
FDIC Acquired Loans [Member] | Residential Mortgages [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 17,663 20,609
FDIC Acquired Loans [Member] | Residential Mortgages [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 162,241 187,033
FDIC Acquired Loans [Member] | Residential Mortgages [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 162,241 187,033
FDIC Acquired Loans [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 12,819 19,699
FDIC Acquired Loans [Member] | Consumer [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 3,995 9,198
Charge-offs (143) (1,270)
Recoveries 196 431
Net provision for loan losses (1,313) (196)
Increase (decrease) in FDIC loss share receivable (188) (4,168)
Loans and Leases receivable, Allowance, Ending Balance 2,547 3,995
FDIC Acquired Loans [Member] | Consumer [Member] | Allowance for Loan Losses [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Amounts related to acquired-impaired loans 2,547 3,995
FDIC Acquired Loans [Member] | Consumer [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: FDIC acquired loans 12,819 19,699
FDIC Acquired Loans [Member] | Consumer [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 12,819 19,699
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 241,430 832,668
Acquired Loans [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 477 1,647
Net provision for loan losses (444) (1,170)
Loans and Leases receivable, Allowance, Ending Balance 33 477
Ending balance: Individually evaluated for impairment 33 477
Acquired Loans [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 241,430 832,668
Ending balance: Individually evaluated for impairment 2,340 2,691
Ending balance: Collectively evaluated for impairment 216,549 768,710
Acquired Loans [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 22,541 61,267
Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance   1,603
Net provision for loan losses   (1,603)
Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 59,843 120,137
Ending balance: Collectively evaluated for impairment 53,367 111,691
Acquired Loans [Member] | Commercial Non-Real Estate [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 6,476 8,446
Acquired Loans [Member] | Construction and Land Development [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance   10
Net provision for loan losses   (10)
Acquired Loans [Member] | Construction and Land Development [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 5,080 21,123
Ending balance: Collectively evaluated for impairment 104 1,442
Acquired Loans [Member] | Construction and Land Development [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 4,976 19,681
Acquired Loans [Member] | Commercial Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 477 34
Net provision for loan losses (444) 443
Loans and Leases receivable, Allowance, Ending Balance 33 477
Ending balance: Individually evaluated for impairment 33 477
Acquired Loans [Member] | Commercial Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 176,460 688,045
Ending balance: Individually evaluated for impairment 2,340 2,691
Ending balance: Collectively evaluated for impairment 163,078 655,577
Acquired Loans [Member] | Commercial Real Estate [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 11,042 29,777
Acquired Loans [Member] | Residential Mortgages [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 27 2,378
Acquired Loans [Member] | Residential Mortgages [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 27 2,378
Acquired Loans [Member] | Consumer [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 20 985
Acquired Loans [Member] | Consumer [Member] | Loans [Member] | Acquired-Impaired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Acquired-impaired loans 20 985
Originated Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 15,258,587 12,810,199
Originated Loans [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 97,701 78,885
Charge-offs (29,163) (31,502)
Recoveries 12,951 14,383
Net provision for loan losses 76,537 35,935
Loans and Leases receivable, Allowance, Ending Balance 158,026 97,701
Ending balance: Individually evaluated for impairment 20,955 377
Ending balance: Collectively evaluated for impairment 137,071 97,324
Originated Loans [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 15,258,587 12,810,199
Ending balance: Individually evaluated for impairment 111,086 27,020
Ending balance: Collectively evaluated for impairment 15,147,501 12,783,179
Originated Loans [Member] | Commercial Non-Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 50,258 33,091
Charge-offs (6,934) (6,813)
Recoveries 3,342 3,047
Net provision for loan losses 62,316 20,933
Loans and Leases receivable, Allowance, Ending Balance 108,982 50,258
Ending balance: Individually evaluated for impairment 19,031 14
Ending balance: Collectively evaluated for impairment 89,951 50,244
Originated Loans [Member] | Commercial Non-Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 6,930,453 5,917,728
Ending balance: Individually evaluated for impairment 81,622 3,987
Ending balance: Collectively evaluated for impairment 6,848,831 5,913,741
Originated Loans [Member] | Construction and Land Development [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 5,413 6,180
Charge-offs (2,424) (4,770)
Recoveries 2,179 4,000
Net provision for loan losses (183) 3
Loans and Leases receivable, Allowance, Ending Balance 4,985 5,413
Ending balance: Individually evaluated for impairment 392 19
Ending balance: Collectively evaluated for impairment 4,593 5,394
Originated Loans [Member] | Construction and Land Development [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 1,139,743 1,073,964
Ending balance: Individually evaluated for impairment 14,226 8,250
Ending balance: Collectively evaluated for impairment 1,125,517 1,065,714
Originated Loans [Member] | Commercial Real Estate [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 16,544 20,649
Charge-offs (1,482) (3,579)
Recoveries 2,405 1,678
Net provision for loan losses (3,408) (2,204)
Loans and Leases receivable, Allowance, Ending Balance 14,059 16,544
Ending balance: Individually evaluated for impairment 1,372 11
Ending balance: Collectively evaluated for impairment 12,687 16,533
Originated Loans [Member] | Commercial Real Estate [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 3,220,509 2,428,195
Ending balance: Individually evaluated for impairment 14,191 12,121
Ending balance: Collectively evaluated for impairment 3,206,318 2,416,074
Originated Loans [Member] | Residential Mortgages [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 8,051 6,892
Charge-offs (1,635) (2,285)
Recoveries 687 644
Net provision for loan losses 587 2,800
Loans and Leases receivable, Allowance, Ending Balance 7,690 8,051
Ending balance: Individually evaluated for impairment 127 330
Ending balance: Collectively evaluated for impairment 7,563 7,721
Originated Loans [Member] | Residential Mortgages [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 1,887,256 1,704,770
Ending balance: Individually evaluated for impairment 895 2,656
Ending balance: Collectively evaluated for impairment 1,886,361 1,702,114
Originated Loans [Member] | Consumer [Member] | Allowance for Loan Losses [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases receivable, Allowance, Beginning Balance 17,435 12,073
Charge-offs (16,688) (14,055)
Recoveries 4,338 5,014
Net provision for loan losses 17,225 14,403
Loans and Leases receivable, Allowance, Ending Balance 22,310 17,435
Ending balance: Individually evaluated for impairment 33 3
Ending balance: Collectively evaluated for impairment 22,277 17,432
Originated Loans [Member] | Consumer [Member] | Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Ending balance: Loans 2,080,626 1,685,542
Ending balance: Individually evaluated for impairment 152 6
Ending balance: Collectively evaluated for impairment $ 2,080,474 $ 1,685,536