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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance $ 48,298 $ 50,185  
Charge-offs (15,113) (12,509)  
Provision for credit losses 12,531 5,087 $ 18,480
Ending Balance 47,764 48,298 50,185
Ending balance: individually evaluated for impaired 1,631 3,746 3,144
Ending balance: collectively evaluated for impaired 46,133 44,552 47,041
Ending balance 5,774,139 5,407,376 4,879,347
Ending balance: individually evaluated for impaired 21,088 35,151 33,668
Ending balance: collectively evaluated for impaired 5,753,051 5,372,225 4,845,679
Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 23,429 35,974  
Ending Balance 19,374 23,429 35,974
Ending balance: individually evaluated for impaired 928 3,478 2,530
Ending balance: collectively evaluated for impaired 18,446 19,951 33,444
Ending balance 1,138,473 1,163,383 1,139,547
Ending balance: individually evaluated for impaired 11,631 22,450 22,325
Ending balance: collectively evaluated for impaired 1,126,842 1,140,933 1,117,222
Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 1,349 577  
Ending Balance 2,002 1,349 577
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 2,002 1,349 577
Ending balance 358,978 248,868 219,621
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 358,978 248,868 219,621
Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,759 2,511  
Ending Balance 3,969 2,759 2,511
Ending balance: individually evaluated for impaired 107 111 180
Ending balance: collectively evaluated for impaired 3,862 2,648 2,331
Ending balance 1,562,405 1,426,370 1,229,192
Ending balance: individually evaluated for impaired 3,747 6,698 5,875
Ending balance: collectively evaluated for impaired 1,558,658 1,419,672 1,223,317
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 17,357 6,619  
Ending Balance 18,386 17,357 6,619
Ending balance: individually evaluated for impaired 596 157 434
Ending balance: collectively evaluated for impaired 17,790 17,200 6,185
Ending balance 2,123,544 2,019,096 1,742,210
Ending balance: individually evaluated for impaired 5,710 6,003 5,468
Ending balance: collectively evaluated for impaired 2,117,834 2,013,093 1,736,742
Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 3,404 4,504  
Ending Balance 4,033 3,404 4,504
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 4,033 3,404 4,504
Ending balance 590,739 549,659 548,777
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 590,739 549,659 548,777
Originated Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 48,252 50,166 50,812
Charge-offs (14,902) (11,997) (26,305)
Recoveries 1,846 5,403 7,198
Provision for credit losses 12,390 4,680 18,461
Ending Balance 47,586 48,252 50,166
Ending balance 5,275,296 5,007,361  
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 23,418 35,974 31,035
Charge-offs (5,201) (6,176) (19,603)
Recoveries 746 3,900 4,164
Provision for credit losses 272 (10,280) 20,378
Ending Balance 19,235 23,418 35,974
Ending balance 1,100,947 1,122,741  
Originated Loans [Member] | Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 1,349 577 887
Charge-offs 0 0 0
Recoveries 135 465 562
Provision for credit losses 518 307 (872)
Ending Balance 2,002 1,349 577
Ending balance 353,008 242,905  
Originated Loans [Member] | Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,753 2,492 2,606
Charge-offs (1,217) (1,261) (1,189)
Recoveries 233 304 481
Provision for credit losses 2,165 1,218 594
Ending Balance 3,934 2,753 2,492
Ending balance 1,313,645 1,206,119  
Originated Loans [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 17,328 6,619 11,924
Charge-offs (3,930) (340) (570)
Recoveries 153 274 1,522
Provision for credit losses 4,831 10,775 (6,257)
Ending Balance 18,382 17,328 6,619
Ending balance 1,922,349 1,892,185  
Originated Loans [Member] | Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 3,404 4,504 4,360
Charge-offs (4,554) (4,220) (4,943)
Recoveries 579 460 469
Provision for credit losses 4,604 2,660 4,618
Ending Balance 4,033 3,404 4,504
Ending balance 585,347 543,411  
Acquired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 46 19  
Charge-offs (211) (512)  
Recoveries 202 132  
Provision for credit losses 141 407  
Ending Balance 178 46 19
Ending balance 498,843 400,015  
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 11 0  
Charge-offs (93) (458)  
Recoveries 42 1  
Provision for credit losses 179 468  
Ending Balance 139 11 0
Ending balance 37,526 40,642  
Acquired Loans [Member] | Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 0 0  
Charge-offs 0 0  
Recoveries 6 5  
Provision for credit losses (6) (5)  
Ending Balance 0 0 0
Ending balance 5,970 5,963  
Acquired Loans [Member] | Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 6 19  
Charge-offs (96) (26)  
Recoveries 128 67  
Provision for credit losses (3) (54)  
Ending Balance 35 6 19
Ending balance 248,760 220,251  
Acquired Loans [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 29 0  
Charge-offs 0 0  
Recoveries 0 4  
Provision for credit losses (25) 25  
Ending Balance 4 29 0
Ending balance 201,195 126,911  
Acquired Loans [Member] | Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 0 0  
Charge-offs (22) (28)  
Recoveries 26 55  
Provision for credit losses (4) (27)  
Ending Balance 0 0 $ 0
Ending balance $ 5,392 $ 6,248