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Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Summary of Significant Accounting Policies      
Number of active contracts 1,200    
Transferred at Point in Time      
Summary of Significant Accounting Policies      
Revenue from contract with customers $ 234,000 $ 237,300 $ 266,800
Transferred over Time      
Summary of Significant Accounting Policies      
Revenue from contract with customers 23,500 20,900 20,200
Interchange and debit card transaction fees      
Summary of Significant Accounting Policies      
Transaction fees 44,100 41,300 40,700
Network costs 19,400 20,700 18,500
Revenue from contract with customers 24,800 20,600 22,200
Trust and investment services income      
Summary of Significant Accounting Policies      
Revenue from contract with customers 45,474 39,447 39,019
Deposit account services      
Summary of Significant Accounting Policies      
Revenue from contract with customers $ 142,300 $ 134,600 $ 129,700