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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
Mar. 31, 2020
Mar. 31, 2019
Noninterest income:    
Gain on OREO, net $ 0 $ 105
Other 1,798 2,044
Total noninterest income 11,640 16,303
Service Charges on Deposit Accounts [Member]    
Noninterest income:    
Revenue from contract with customer 4,776 5,141
Trust and Investment Services [Member]    
Noninterest income:    
Revenue from contract with customer 2,420 2,182
Bankcard Services [Member]    
Noninterest income:    
Revenue from contract with customer 577 950
Accounting Standards Update 2014-09 [Member]    
Noninterest income:    
Gain on OREO, net 10 105
Other 1,798 2,044
Total noninterest income 9,581 10,422
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]    
Noninterest income:    
Revenue from contract with customer 4,776 5,141
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]    
Noninterest income:    
Revenue from contract with customer 2,420 2,182
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]    
Noninterest income:    
Revenue from contract with customer 577 950
Accounting Standards Update 2014-09 Not Adopted [Member]    
Noninterest income:    
Total noninterest income $ 2,059 $ 5,881