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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Noninterest income:        
Other $ 1,178 $ 1,811 $ 2,569 $ 3,030
Total noninterest income 9,695 10,776 22,611 19,498
Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 4,091 3,982 8,136 7,709
Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 2,399 2,613 4,556 4,909
Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 958 871 1,762 1,636
Accounting Standards Update 2014-09 [Member]        
Noninterest income:        
Other 1,178 1,409 2,569 2,628
Total noninterest income 8,626 8,875 17,023 16,882
Accounting Standards Update 2014-09 [Member] | Service Charges on Deposit Accounts [Member]        
Noninterest income:        
Revenue from contract with customer 4,091 3,982 8,136 7,709
Accounting Standards Update 2014-09 [Member] | Trust and Investment Services [Member]        
Noninterest income:        
Revenue from contract with customer 2,399 2,613 4,556 4,909
Accounting Standards Update 2014-09 [Member] | Bankcard Services [Member]        
Noninterest income:        
Revenue from contract with customer 958 871 1,762 1,636
Accounting Standards Update 2014-09 Not Adopted [Member]        
Noninterest income:        
Total noninterest income $ 1,069 $ 1,901 $ 5,588 $ 2,616