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Summary of Significant Accounting Policies - Revenue from Contracts with Customers (Details) $ in Thousands, contract in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) contract | Dec. 31, 2022 USD ($) | Dec. 31, 2021 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 | $ 237,300 | $ 266,800 | $ 255,400
Transferred over Time |  |  |
Summary of Significant Accounting Policies |  |  |
Revenue from contract with customers | 20,900 | 20,200 | 19,900
Interchange and debit card transaction fees |  |  |
Summary of Significant Accounting Policies |  |  |
Transaction fees | 41,300 | 40,700 | 38,300
Network costs | 20,700 | 18,500 | 20,300
Revenue from contract with customers | 20,600 | 22,200 | 18,000
Trust and investment services income |  |  |
Summary of Significant Accounting Policies |  |  |
Revenue from contract with customers | 39,447 | 39,019 | 36,981
Deposit account services |  |  |
Summary of Significant Accounting Policies |  |  |
Revenue from contract with customers | $ 134,600 | $ 129,700 | $ 107,300

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