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Investment Securities - Narrative (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Securities Financing Transactions Disclosures [Abstract] |  |  |
AFS accrued interest | $ 1,100 |  |
Held-to-maturity securities | 386,618 |  | $ 399,128
HTM accrued interest | $ 2,200 |  |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest receivable |  |
Available-for-sale securities pledged as collateral | $ 490,100 |  | 380,300
Letter of credit outstanding, amount | 154,000 |  | $ 153,500
Net gains | $ 0 | $ 0 |

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