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Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details)
$ in Thousands, contract in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
contract
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Summary of Significant Accounting Policies      
Number of active contracts | contract 1.1    
Transferred at Point in Time      
Summary of Significant Accounting Policies      
Revenue from contract with customers $ 180,800 $ 182,800 $ 104,300
Transferred over Time      
Summary of Significant Accounting Policies      
Revenue from contract with customers 19,900 17,900 19,000
Interchange and debit card transaction fees      
Summary of Significant Accounting Policies      
Revenue from contract with customers 18,000 13,700 12,600
Interchange and debit card transaction fees | Before 606      
Summary of Significant Accounting Policies      
Transaction fees 38,300 30,200 24,500
Network costs 20,300 16,500 11,900
Trust and investment services income      
Summary of Significant Accounting Policies      
Revenue from contract with customers 36,981 29,437 29,244
Deposit account services      
Summary of Significant Accounting Policies      
Revenue from contract with customers $ 107,300 $ 85,700 $ 76,400