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Loans and Allowance for Credit Losses - Schedule of Activity in Troubled Debt Restructurings (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period $ 31,738 $ 43,710 $ 54,003
(Charge-offs)/ Recoveries 5,450   431
(Payments)/ Disbursements (14,167)   (16,415)
Additions 9,632   5,691
Balance at end of period 32,653 31,738 43,710
Previously Reported      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 31,738 43,710  
(Charge-offs)/ Recoveries   (4,010)  
(Payments)/ Disbursements   (29,093)  
Additions   21,131  
Balance at end of period   31,738 43,710
Commercial      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 12,412 10,275 12,088
(Charge-offs)/ Recoveries 633   (169)
(Payments)/ Disbursements (4,557)   (5,188)
Additions 2,602   3,544
Balance at end of period 11,090 12,412 10,275
Commercial | Previously Reported      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 14,862 10,275  
(Charge-offs)/ Recoveries   (1,911)  
(Payments)/ Disbursements   (3,733)  
Additions   10,231  
Balance at end of period   14,862 10,275
Commercial real estate      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 14,277 27,671 34,705
(Charge-offs)/ Recoveries 4,801   561
(Payments)/ Disbursements (8,502)   (8,808)
Additions 7,030   1,213
Balance at end of period 17,606 14,277 27,671
Commercial real estate | Previously Reported      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 12,404 27,671  
(Charge-offs)/ Recoveries   (2,112)  
(Payments)/ Disbursements   (23,182)  
Additions   10,027  
Balance at end of period   12,404 27,671
BBCC      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 578    
(Charge-offs)/ Recoveries (19)    
(Payments)/ Disbursements (447)    
Additions 0    
Balance at end of period 112 578  
Residential real estate      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 3,107 3,390 3,315
(Charge-offs)/ Recoveries 0   23
(Payments)/ Disbursements (283)   (450)
Additions 0   502
Balance at end of period 2,824 3,107 3,390
Residential real estate | Previously Reported      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 2,976 3,390  
(Charge-offs)/ Recoveries   0  
(Payments)/ Disbursements   (971)  
Additions   557  
Balance at end of period   2,976 3,390
Indirect      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 0    
(Charge-offs)/ Recoveries 9    
(Payments)/ Disbursements (9)    
Additions 0    
Balance at end of period 0 0  
Direct      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 983    
(Charge-offs)/ Recoveries 23    
(Payments)/ Disbursements (267)    
Additions 0    
Balance at end of period 739 983  
Home equity      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period 381    
(Charge-offs)/ Recoveries 3    
(Payments)/ Disbursements (102)    
Additions 0    
Balance at end of period 282 381  
Consumer      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period   2,374 3,895
(Charge-offs)/ Recoveries     16
(Payments)/ Disbursements     (1,969)
Additions     432
Balance at end of period     2,374
Consumer | Previously Reported      
Financing Receivable, Troubled Debt Restructuring [Roll Forward]      
Balance at beginning of period $ 1,496 2,374  
(Charge-offs)/ Recoveries   13  
(Payments)/ Disbursements   (1,207)  
Additions   316  
Balance at end of period   $ 1,496 $ 2,374