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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue      
Net interest income $ 566,318 $ 528,804 $ 491,672
Service charges on deposit accounts 32,036 35,807 37,392
Credit and debit card fees 65,716 64,049 65,262
Other service charges and fees 38,316 34,063 35,355
Fees And Commissions Fiduciary And Trust Activities And Investment Advisory Management And Administrative Services 31,324 30,485 29,440
Not in scope of Topic 606 (5,838)    
Total noninterest income 178,993 205,605 226,037
Total revenue 745,311    
Retail Banking      
Disaggregation of Revenue      
Net interest income 447,023 430,379 415,964
Service charges on deposit accounts 29,997    
Not in scope of Topic 606 8,917    
Total noninterest income 90,800 90,702 91,583
Total revenue 537,823    
Commercial Banking      
Disaggregation of Revenue      
Net interest income 113,475 111,109 115,455
Service charges on deposit accounts 15    
Not in scope of Topic 606 (9,165)    
Total noninterest income 79,773 74,236 73,264
Total revenue 193,248    
Treasury and Other      
Disaggregation of Revenue      
Net interest income 5,820 (12,684) (39,747)
Service charges on deposit accounts 2,024    
Not in scope of Topic 606 (5,590)    
Total noninterest income 8,420 $ 40,667 $ 61,190
Total revenue 14,240    
Credit and debit card fees.      
Disaggregation of Revenue      
Revenue by type of service 85,298    
Credit and debit card fees. | Commercial Banking      
Disaggregation of Revenue      
Revenue by type of service 78,218    
Credit and debit card fees. | Treasury and Other      
Disaggregation of Revenue      
Revenue by type of service 7,080    
Other service charges and fees.      
Disaggregation of Revenue      
Revenue by type of service 26,241    
Other service charges and fees. | Retail Banking      
Disaggregation of Revenue      
Revenue by type of service 19,977    
Other service charges and fees. | Commercial Banking      
Disaggregation of Revenue      
Revenue by type of service 4,089    
Other service charges and fees. | Treasury and Other      
Disaggregation of Revenue      
Revenue by type of service 2,175    
Trust and investment services income.      
Disaggregation of Revenue      
Revenue by type of service 31,324    
Trust and investment services income. | Retail Banking      
Disaggregation of Revenue      
Revenue by type of service 31,324    
Other.      
Disaggregation of Revenue      
Revenue by type of service 9,932    
Other. | Retail Banking      
Disaggregation of Revenue      
Revenue by type of service 585    
Other. | Commercial Banking      
Disaggregation of Revenue      
Revenue by type of service 6,616    
Other. | Treasury and Other      
Disaggregation of Revenue      
Revenue by type of service $ 2,731