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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Noninterest income:      
Gain on OREO, net $ 105 $ 3,540 $ 0
Other 9,956 6,588 6,196
Total noninterest income 59,042 43,481 42,118
Service Charges on Deposit Accounts [Member]      
Noninterest income:      
Revenue from contract with customer 20,010 17,070 15,809
Trust and Investment Services [Member]      
Noninterest income:      
Revenue from contract with customer 9,525 8,774 9,845
Bankcard Services [Member]      
Noninterest income:      
Revenue from contract with customer 3,163 3,485 3,406
Accounting Standards Update 2014-09 [Member]      
Noninterest income:      
Gain on OREO, net 129 3,546 6
Other 9,951 6,588 4,888
Total noninterest income 42,778 39,463 33,954
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]      
Noninterest income:      
Revenue from contract with customer 20,010 17,070 15,809
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]      
Noninterest income:      
Revenue from contract with customer 9,525 8,774 9,845
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]      
Noninterest income:      
Revenue from contract with customer 3,163 3,485 3,406
Accounting Standards Update 2014-09 Not Adopted [Member]      
Noninterest income:      
Total noninterest income $ 16,264 $ 4,018 $ 8,164