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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Noninterest income:        
Gain on OREO, net     $ 477 $ 0
Other $ 1,679 $ 3,778 3,361 5,576
Total noninterest income 10,836 12,152 24,517 23,792
Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 4,169 3,809 8,154 8,585
Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 3,167 2,477 5,778 4,897
Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 533 405 883 982
Accounting Standards Update 2014-09 [Member]        
Noninterest income:        
Gain on OREO, net 48 0 477 10
Other 1,679 3,778 3,361 5,576
Total noninterest income 9,596 10,469 18,653 20,050
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 4,169 3,809 8,154 8,585
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 3,167 2,477 5,778 4,897
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 533 405 883 982
Accounting Standards Update 2014-09 Not Adopted [Member]        
Noninterest income:        
Total noninterest income $ 1,240 $ 1,683 $ 5,864 $ 3,742