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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disaggregation of Revenue    
Net interest income $ 145,089 $ 139,672
Service charges on deposit accounts 8,060 7,955
Credit and debit card fees 16,655 15,497
Other service charges and fees 9,129 9,342
Not in scope of Topic 606 784 3,424
Total noninterest income 47,072 48,700
Total revenue 192,161 188,372
Retail Banking    
Disaggregation of Revenue    
Net interest income 113,903 109,654
Service charges on deposit accounts 7,541 7,448
Not in scope of Topic 606 2,469 2,160
Total noninterest income 24,176 22,732
Total revenue 138,079 132,386
Commercial Banking    
Disaggregation of Revenue    
Net interest income 27,980 27,879
Service charges on deposit accounts 3 4
Not in scope of Topic 606 (3,507) (1,330)
Total noninterest income 18,081 20,000
Total revenue 46,061 47,879
Treasury and Other    
Disaggregation of Revenue    
Net interest income 3,206 2,139
Service charges on deposit accounts 516 503
Not in scope of Topic 606 1,822 2,594
Total noninterest income 4,815 5,968
Total revenue 8,021 8,107
Credit and debit card fees.    
Disaggregation of Revenue    
Revenue by type of service 21,434 20,408
Credit and debit card fees. | Commercial Banking    
Disaggregation of Revenue    
Revenue by type of service 19,707 18,621
Credit and debit card fees. | Treasury and Other    
Disaggregation of Revenue    
Revenue by type of service 1,727 1,787
Other service charges and fees.    
Disaggregation of Revenue    
Revenue by type of service 6,244 6,276
Other service charges and fees. | Retail Banking    
Disaggregation of Revenue    
Revenue by type of service 5,333 4,745
Other service charges and fees. | Commercial Banking    
Disaggregation of Revenue    
Revenue by type of service 369 898
Other service charges and fees. | Treasury and Other    
Disaggregation of Revenue    
Revenue by type of service 542 633
Trust and investment services income.    
Disaggregation of Revenue    
Revenue by type of service 8,618 8,231
Trust and investment services income. | Retail Banking    
Disaggregation of Revenue    
Revenue by type of service 8,618 8,231
Other.    
Disaggregation of Revenue    
Revenue by type of service 1,932 2,406
Other. | Retail Banking    
Disaggregation of Revenue    
Revenue by type of service 215 148
Other. | Commercial Banking    
Disaggregation of Revenue    
Revenue by type of service 1,509 1,807
Other. | Treasury and Other    
Disaggregation of Revenue    
Revenue by type of service $ 208 $ 451