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New Accounting Standards (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2020
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Unfunded commitments, allowance for credit loss | $ 41,900 | $ 22,400 |
Undivided profits | $ 1,255,586 | $ 1,093,270 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Allowance for credit losses on loans |  |  | $ 151,400
Unfunded commitments, allowance for credit loss |  |  | 24,000
Debt securities, allowance for credit loss |  |  | 742
Undivided profits |  |  | $ 128,100

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