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Revenue Recognition - Service Charged on Deposit Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts $ 4,416 $ 4,613 $ 8,733 $ 9,414
Wire transfer fees 1,311 1,250 2,400 2,457
Wire transfer fees        
Disaggregation of Revenue [Line Items]        
Wire transfer fees 1,166 1,149 2,100 2,229
Foreign exchange fees        
Disaggregation of Revenue [Line Items]        
Wire transfer fees 145 101 300 228
Noninterest Bearing Deposits        
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts 4,400 4,598 8,701 9,385
Noninterest Bearing Deposits | Monthly service charges        
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts 406 446 829 885
Noninterest Bearing Deposits | Customer analysis charges        
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts 1,871 2,036 3,594 4,060
Noninterest Bearing Deposits | NSF charges        
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts 1,926 1,895 3,868 3,986
Noninterest Bearing Deposits | Other service charges        
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts 197 221 410 454
Interest-bearing Deposits | Monthly service charges        
Disaggregation of Revenue [Line Items]        
Service fees on deposit accounts $ 16 $ 15 $ 32 $ 29