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Investment Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Federal Reserve and Federal Home Loan Bank stock | $ 37,728 |  | $ 37,728 |  | $ 25,748
Allowance for credit losses | 17 |  | 17 |  | 17
HTM Allowance for credit losses | 1,237 |  | 1,237 |  | $ 1,956
Debt securities, available-for-sale, realized gain | 3 | $ 5 | 10 | $ 126 |
Debt securities, available-for-sale, realized loss | 0 | 0 | 0 | 140 |
Gross proceeds from sales and calls | $ 4,500 | $ 2,600 | $ 31,600 | $ 11,200 |
Holdings of securities of any one issuer | 10.00% |  | 10.00% |  | 10.00%
Collateral Pledged |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt securities, available-for-sale, restricted | $ 1,400,000 |  | $ 1,400,000 |  | $ 2,100,000
Other Assets |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Accrued interest on available for sale securities | 7,400 |  | 7,400 |  | 7,600
Residential mortgage-backed securities |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized loss |  |  | 46,500 |  | 51,700
Allowance for credit losses | $ 0 |  | $ 0 |  | $ 0

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