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Revenue from Contracts with Customers - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenue from Contracts with Customers      
Net interest income $ 573,402 $ 566,318 $ 528,804
Not in scope of Topic 606 25,137 (5,838)  
Total noninterest income 192,533 178,993 205,605
Total revenue 765,935 745,311  
Retail Banking      
Revenue from Contracts with Customers      
Net interest income 413,029 420,165 409,796
Not in scope of Topic 606 8,844 8,917  
Total noninterest income 95,413 89,669 89,372
Total revenue 508,442 509,834  
Commercial Banking      
Revenue from Contracts with Customers      
Net interest income 141,227 140,333 131,692
Not in scope of Topic 606 7,368 (9,165)  
Total noninterest income 73,635 80,904 75,566
Total revenue 214,862 221,237  
Treasury and Other      
Revenue from Contracts with Customers      
Net interest income 19,146 5,820 (12,684)
Not in scope of Topic 606 8,925 (5,590)  
Total noninterest income 23,485 8,420 $ 40,667
Total revenue 42,631 14,240  
Service charges on deposit accounts.      
Revenue from Contracts with Customers      
Revenue by type of service 33,778 32,036  
Service charges on deposit accounts. | Retail Banking      
Revenue from Contracts with Customers      
Revenue by type of service 30,298 28,866  
Service charges on deposit accounts. | Commercial Banking      
Revenue from Contracts with Customers      
Revenue by type of service 1,238 1,146  
Service charges on deposit accounts. | Treasury and Other      
Revenue from Contracts with Customers      
Revenue by type of service 2,242 2,024  
Credit and debit card fees.      
Revenue from Contracts with Customers      
Revenue by type of service 64,846 85,298  
Credit and debit card fees. | Commercial Banking      
Revenue from Contracts with Customers      
Revenue by type of service 58,034 78,218  
Credit and debit card fees. | Treasury and Other      
Revenue from Contracts with Customers      
Revenue by type of service 6,812 7,080  
Other service charges and fees.      
Revenue from Contracts with Customers      
Revenue by type of service 24,705 26,241  
Other service charges and fees. | Retail Banking      
Revenue from Contracts with Customers      
Revenue by type of service 20,454 19,977  
Other service charges and fees. | Commercial Banking      
Revenue from Contracts with Customers      
Revenue by type of service 2,096 4,089  
Other service charges and fees. | Treasury and Other      
Revenue from Contracts with Customers      
Revenue by type of service 2,155 2,175  
Trust and investment services income.      
Revenue from Contracts with Customers      
Revenue by type of service 35,102 31,324  
Trust and investment services income. | Retail Banking      
Revenue from Contracts with Customers      
Revenue by type of service 35,102 31,324  
Other.      
Revenue from Contracts with Customers      
Revenue by type of service 8,965 9,932  
Other. | Retail Banking      
Revenue from Contracts with Customers      
Revenue by type of service 715 585  
Other. | Commercial Banking      
Revenue from Contracts with Customers      
Revenue by type of service 4,899 6,616  
Other. | Treasury and Other      
Revenue from Contracts with Customers      
Revenue by type of service $ 3,351 $ 2,731