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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Noninterest income:        
Gain on OREO, net     $ 477 $ 0
Other $ 1,581 $ 3,160 4,942 8,736
Total noninterest income 10,483 13,153 35,000 36,945
Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 4,513 3,970 12,667 12,555
Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 2,681 2,405 8,459 7,302
Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 479 456 1,362 1,438
Accounting Standards Update 2014-09 [Member]        
Noninterest income:        
Gain on OREO, net 0 13 477 23
Other 1,581 3,160 4,753 8,736
Total noninterest income 9,254 10,004 27,718 30,054
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 4,513 3,970 12,667 12,555
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 2,681 2,405 8,459 7,302
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 479 456 1,362 1,438
Accounting Standards Update 2014-09 Not Adopted [Member]        
Noninterest income:        
Total noninterest income $ 1,229 $ 3,149 $ 7,282 $ 6,891