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Investment Securities - Narrative (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Securities Financing Transactions Disclosures [Abstract] |  |
Accrued interest, after allowance for credit loss | $ 1,300 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest receivable |
Held to maturity, at amortized cost | $ 399,128 | $ 399,494
Held-to-maturity, accrued Interest, after allowance for credit loss | $ 1,900 |
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 | $ 380,300 | 338,800
Letter of credit outstanding, amount | $ 153,500 | $ 189,000

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