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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, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Noninterest income:        
Other $ 4,099 $ 1,127 $ 9,393 $ 5,490
Total noninterest income 14,309 11,590 40,167 37,524
Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 5,062 5,233 15,244 15,625
Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 3,246 2,867 9,475 8,651
Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 354 376 1,221 1,102
Accounting Standards Update 2014-09 [Member]        
Noninterest income:        
Gain/(loss) on sale of other investments 2,575 2,575
Other 1,524 1,127 6,818 8,207
Total noninterest income 12,761 9,603 35,333 33,585
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 5,062 5,233 15,244 15,625
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 3,246 2,867 9,475 8,651
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 354 376 1,221 1,102
Accounting Standards Update 2014-09 Not Adopted [Member]        
Noninterest income:        
Total noninterest income $ 1,548 $ 1,987 $ 4,834 $ 3,939