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Securities - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2024 USD ($) security | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($)
Marketable Securities [Line Items] |  |  |
Number of securities in unrealized loss positions | security | 2,115 | 2,290 |
Unrealized loss positions | $ 1,800,000,000 | $ 2,100,000,000 |
Percentage of portfolio | 86.00% | 85.00% |
Allowance for credit losses for available for sale debt securities | $ 0 | $ 0 |
Allowance for credit loss | 158,000 | 157,000 | $ 257,000
Federal funds sold | 1,867,848,000 | 1,945,795,000 |
Accrued interest receivable on available for sale debt securities | 12,700,000 | 14,700,000 |
Income tax expense from reclassification | 8,200,000 | 6,700,000 | $ 0
State and municipal |  |  |
Marketable Securities [Line Items] |  |  |
Federal funds sold | 1,048,862,000 | 1,088,499,000 |
State and municipal | Internally-Assigned Rating Methodology |  |  |
Marketable Securities [Line Items] |  |  |
Federal funds sold | $ 125,000,000 | $ 143,700,000 |

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