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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
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Noninterest income:      
Gain on OREO, net $ 365 $ 105 $ 3,540
Other 11,277 9,956 6,588
Total noninterest income 49,870 59,042 43,481
Service Charges on Deposit Accounts [Member]      
Noninterest income:      
Revenue from contract with customer 16,561 20,010 17,070
Trust and Investment Services [Member]      
Noninterest income:      
Revenue from contract with customer 9,978 9,525 8,774
Bankcard Services [Member]      
Noninterest income:      
Revenue from contract with customer 1,886 3,163 3,485
Accounting Standards Update 2014-09 [Member]      
Noninterest income:      
Gain on OREO, net 388 129 3,546
Other 11,277 9,951 6,588
Total noninterest income 40,090 42,778 39,463
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]      
Noninterest income:      
Revenue from contract with customer 16,561 20,010 17,070
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]      
Noninterest income:      
Revenue from contract with customer 9,978 9,525 8,774
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]      
Noninterest income:      
Revenue from contract with customer 1,886 3,163 3,485
Accounting Standards Update 2014-09 Not Adopted [Member]      
Noninterest income:      
Total noninterest income $ 9,780 $ 16,264 $ 4,018