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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Provision for credit losses $ 4,095 $ 6,903      
Ending Balance     $ 49,653   $ 53,732
Ending balance: individually evaluated for impaired     2,045   11,473
Ending balance: collectively evaluated for impaired     47,608   42,259
Total     5,871,070 $ 5,774,139 5,381,305
Ending balance: individually evaluated for impaired     20,676   50,491
Ending balance: collectively evaluated for impaired     5,850,394   5,330,814
Residential real estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Ending Balance     4,185   3,154
Total     1,565,349   1,434,623
Commercial Real Estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Ending Balance     19,218   18,496
Ending balance: individually evaluated for impaired     914   2,141
Ending balance: collectively evaluated for impaired     18,304   16,355
Total     2,138,376   2,027,072
Ending balance: individually evaluated for impaired     11,111   10,360
Ending balance: collectively evaluated for impaired     2,127,265   2,016,712
Commercial, financial, agricultural and other [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Ending Balance     19,833   27,552
Ending balance: individually evaluated for impaired     1,012   9,045
Ending balance: collectively evaluated for impaired     18,821   18,507
Total     1,180,320   1,131,594
Ending balance: individually evaluated for impaired     5,627   33,278
Ending balance: collectively evaluated for impaired     1,174,693   1,098,316
Real estate construction [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Ending Balance     2,254   1,114
Ending balance: individually evaluated for impaired     0   0
Ending balance: collectively evaluated for impaired     2,254   1,114
Total     389,387   246,961
Ending balance: individually evaluated for impaired     0   0
Ending balance: collectively evaluated for impaired     389,387   246,961
Residential real estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Ending balance: individually evaluated for impaired     119   287
Ending balance: collectively evaluated for impaired     4,066   2,867
Ending balance: individually evaluated for impaired     3,938   6,853
Ending balance: collectively evaluated for impaired     1,561,411   1,427,770
Loans to individuals [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Ending Balance     4,163   3,416
Ending balance: individually evaluated for impaired     0   0
Ending balance: collectively evaluated for impaired     4,163   3,416
Total     597,638   541,055
Ending balance: individually evaluated for impaired     0   0
Ending balance: collectively evaluated for impaired     597,638   541,055
Acquired Loans [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 178 46      
Charge-offs (576) (20)      
Recoveries 44 37      
Provision for credit losses 407 (28)      
Ending Balance 178 46 53 178 35
Total     478,318 498,843  
Acquired Loans [Member] | Residential real estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 35 6      
Charge-offs (45) (16)      
Recoveries 24 17      
Provision for credit losses 21 6      
Ending Balance 35 6 35 35 13
Total     239,609 248,760  
Acquired Loans [Member] | Commercial Real Estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 4 29      
Charge-offs 0 0      
Recoveries 0 0      
Provision for credit losses (4) (27)      
Ending Balance 4 29 0 4 2
Total     191,894 201,195  
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 139 11      
Charge-offs (526) 0      
Recoveries 11 7      
Provision for credit losses 394 2      
Ending Balance 139 11 18 139 20
Total     36,435 37,526  
Acquired Loans [Member] | Real estate construction [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 0 0      
Charge-offs 0 0      
Recoveries 0 6      
Provision for credit losses 0 (6)      
Ending Balance 0 0 0 0 0
Total     6,223 5,970  
Acquired Loans [Member] | Loans to individuals [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 0 0      
Charge-offs (5) (4)      
Recoveries 9 7      
Provision for credit losses (4) (3)      
Ending Balance 0 0 0 0 0
Total     4,157 5,392  
Originated Loans [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 47,586 48,252      
Charge-offs (2,028) (2,082)      
Recoveries 354 596      
Provision for credit losses 3,688 6,931      
Ending Balance 47,586 48,252 49,600 47,586 53,697
Total     5,392,752 5,275,296  
Originated Loans [Member] | Residential real estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 3,934 2,753      
Charge-offs (136) (455)      
Recoveries 81 75      
Provision for credit losses 271 768      
Ending Balance 3,934 2,753 4,150 3,934 3,141
Total     1,325,740 1,313,645  
Originated Loans [Member] | Commercial Real Estate [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 18,382 17,328      
Charge-offs (299) (168)      
Recoveries 41 69      
Provision for credit losses 1,094 1,265      
Ending Balance 18,382 17,328 19,218 18,382 18,494
Total     1,946,482 1,922,349  
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 19,235 23,418      
Charge-offs (483) (290)      
Recoveries 76 256      
Provision for credit losses 987 4,148      
Ending Balance 19,235 23,418 19,815 19,235 27,532
Total     1,143,885 1,100,947  
Originated Loans [Member] | Real estate construction [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 2,002 1,349      
Charge-offs 0 0      
Recoveries 42 1      
Provision for credit losses 210 (236)      
Ending Balance 2,002 1,349 2,254 2,002 1,114
Total     383,164 353,008  
Originated Loans [Member] | Loans to individuals [Member]          
Accounts Receivable, Allowance for Credit Loss [Roll Forward]          
Beginning Balance 4,033 3,404      
Charge-offs (1,110) (1,169)      
Recoveries 114 195      
Provision for credit losses 1,126 986      
Ending Balance $ 4,033 $ 3,404 4,163 4,033 $ 3,416
Total     $ 593,481 $ 585,347