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Investment Securities - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items] |  |  |
Federal Reserve and Federal Home Loan Bank stock | $ 54,678 |  | $ 25,748
Provision for credit losses - HTM debt securities | 1 | $ 1,242 |
Provision for credit losses - AFS debt securities | 0 | 14 |
Allowance for credit losses | 17 |  | 17
HTM Allowance for credit losses | 1,957 |  | $ 1,956
Debt securities, available-for-sale, realized gain | 4 | 5 |
Debt securities, available-for-sale, realized loss | 0 | (26) |
Gross proceeds from sales and calls | $ 27,100 | $ 8,400 |
Holdings of securities of any one issuer | 10.00% |  | 10.00%
Collateral Pledged |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available-for-sale, restricted | $ 2,100,000 |  |
Other Assets |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest on available for sale securities | 7,800 |  | $ 7,600
Residential mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Unrealized loss | 50,000 |  | 51,700
Allowance for credit losses | $ 0 |  | $ 0

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