XML 106 R91.htm IDEA: XBRL DOCUMENT v3.8.0.1
Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance $ 50,185 $ 50,812 $ 52,051
Charge-offs     (18,868)
Recoveries     2,681
Provision for credit losses 5,087 18,480 14,948
Ending Balance 48,298 50,185 50,812
Ending balance: individually evaluated for impaired 3,746 3,144 7,045
Ending balance: collectively evaluated for impaired 44,552 47,041 43,767
Ending balance 5,407,376 4,879,347 4,683,750
Ending balance: individually evaluated for impaired 35,151 33,668 44,009
Ending balance: collectively evaluated for impaired 5,372,225 4,845,679 4,639,741
Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 35,974 31,035 29,627
Charge-offs     (11,429)
Recoveries     1,097
Provision for credit losses     11,740
Ending Balance 23,429 35,974 31,035
Ending balance: individually evaluated for impaired 3,478 2,530 6,952
Ending balance: collectively evaluated for impaired 19,951 33,444 24,083
Ending balance 1,163,383 1,139,547 1,150,906
Ending balance: individually evaluated for impaired 22,450 22,325 30,767
Ending balance: collectively evaluated for impaired 1,140,933 1,117,222 1,120,139
Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 577 887 2,063
Charge-offs     (8)
Recoveries     84
Provision for credit losses     (1,252)
Ending Balance 1,349 577 887
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 1,349 577 887
Ending balance 248,868 219,621 220,736
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 248,868 219,621 220,736
Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,511 2,606 3,664
Charge-offs     (1,539)
Recoveries     587
Provision for credit losses     (106)
Ending Balance 2,759 2,511 2,606
Ending balance: individually evaluated for impaired 111 180 51
Ending balance: collectively evaluated for impaired 2,648 2,331 2,555
Ending balance 1,426,370 1,229,192 1,224,465
Ending balance: individually evaluated for impaired 6,698 5,875 6,099
Ending balance: collectively evaluated for impaired 1,419,672 1,223,317 1,218,366
Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 6,619 11,924 11,881
Charge-offs     (1,538)
Recoveries     229
Provision for credit losses     1,352
Ending Balance 17,357 6,619 11,924
Ending balance: individually evaluated for impaired 157 434 42
Ending balance: collectively evaluated for impaired 17,200 6,185 11,882
Ending balance 2,019,096 1,742,210 1,479,000
Ending balance: individually evaluated for impaired 6,003 5,468 7,143
Ending balance: collectively evaluated for impaired 2,013,093 1,736,742 1,471,857
Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 4,504 4,360 4,816
Charge-offs     (4,354)
Recoveries     684
Provision for credit losses     3,214
Ending Balance 3,404 4,504 4,360
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 3,404 4,504 4,360
Ending balance 549,659 548,777 608,643
Ending balance: individually evaluated for impaired 0 0 0
Ending balance: collectively evaluated for impaired 549,659 548,777 608,643
Originated Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 50,166 50,812  
Charge-offs (11,997) (26,305)  
Recoveries 5,403 7,198  
Provision for credit losses 4,680 18,461  
Ending Balance 48,252 50,166 50,812
Ending balance 5,007,361 4,778,471  
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 35,974 31,035  
Charge-offs (6,176) (19,603)  
Recoveries 3,900 4,164  
Provision for credit losses (10,280) 20,378  
Ending Balance 23,418 35,974 31,035
Ending balance 1,122,741 1,131,148  
Originated Loans [Member] | Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 577 887  
Charge-offs 0 0  
Recoveries 465 562  
Provision for credit losses 307 (872)  
Ending Balance 1,349 577 887
Ending balance 242,905 217,840  
Originated Loans [Member] | Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 2,492 2,606  
Charge-offs (1,261) (1,189)  
Recoveries 304 481  
Provision for credit losses 1,218 594  
Ending Balance 2,753 2,492 2,606
Ending balance 1,206,119 1,165,851  
Originated Loans [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 6,619 11,924  
Charge-offs (340) (570)  
Recoveries 274 1,522  
Provision for credit losses 10,775 (6,257)  
Ending Balance 17,328 6,619 11,924
Ending balance 1,892,185 1,717,043  
Originated Loans [Member] | Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 4,504 4,360  
Charge-offs (4,220) (4,943)  
Recoveries 460 469  
Provision for credit losses 2,660 4,618  
Ending Balance 3,404 4,504 $ 4,360
Ending balance 543,411 546,589  
Acquired Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 19    
Charge-offs (512)    
Recoveries 132    
Provision for credit losses 407    
Ending Balance 46 19  
Ending balance 400,015 100,876  
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 0    
Charge-offs (458)    
Recoveries 1    
Provision for credit losses 468    
Ending Balance 11 0  
Ending balance 40,642 8,399  
Acquired Loans [Member] | Real Estate Construction [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 0    
Charge-offs 0    
Recoveries 5    
Provision for credit losses (5)    
Ending Balance 0 0  
Ending balance 5,963 1,781  
Acquired Loans [Member] | Residential real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 19    
Charge-offs (26)    
Recoveries 67    
Provision for credit losses (54)    
Ending Balance 6 19  
Ending balance 220,251 63,341  
Acquired Loans [Member] | Commercial real estate [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 0    
Charge-offs 0    
Recoveries 4    
Provision for credit losses 25    
Ending Balance 29 0  
Ending balance 126,911 25,167  
Acquired Loans [Member] | Loans To Individuals [Member]      
Financing Receivable, Allowance for Credit Losses [Roll Forward]      
Beginning Balance 0    
Charge-offs (28)    
Recoveries 55    
Provision for credit losses (27)    
Ending Balance 0 0  
Ending balance $ 6,248 $ 2,188