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Revenue Recognition - Summary of Non Interest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of Topic 606 (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Noninterest income:        
Gain on OREO, net     $ 0 $ 105
Other $ 3,160 $ 2,297 8,736 6,944
Total noninterest income 13,153 11,894 36,945 46,402
Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 3,970 4,833 12,555 15,039
Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 2,405 2,330 7,302 6,964
Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 456 637 1,438 2,614
Accounting Standards Update 2014-09 [Member]        
Noninterest income:        
Gain on OREO, net 13 0 23 129
Other 3,160 2,292 8,736 6,939
Total noninterest income 10,004 10,092 30,054 31,685
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 3,970 4,833 12,555 15,039
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 2,405 2,330 7,302 6,964
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 456 637 1,438 2,614
Accounting Standards Update 2014-09 Not Adopted [Member]        
Noninterest income:        
Total noninterest income $ 3,149 $ 1,802 $ 6,891 $ 14,717