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Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary of Significant Accounting Policies      
Number of active contracts $ 1,100    
Transferred at Point in Time      
Summary of Significant Accounting Policies      
Revenue from contract with customers 182,800 $ 104,300 $ 113,600
Transferred over Time      
Summary of Significant Accounting Policies      
Revenue from contract with customers 17,900 19,000 19,200
Interchange and debit card transaction fees      
Summary of Significant Accounting Policies      
Revenue from contract with customers 13,700 12,600 20,900
Interchange and debit card transaction fees | Before 606      
Summary of Significant Accounting Policies      
Transaction fees 30,200 24,500 33,000
Network costs 16,500 11,900 12,100
Trust and investment services income      
Summary of Significant Accounting Policies      
Revenue from contract with customers 29,437 29,244 30,229
Deposit account services      
Summary of Significant Accounting Policies      
Revenue from contract with customers $ 85,700 $ 76,400 $ 82,600