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Investments - Revenue and General Obligation Bonds (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 USD ($) item state | Dec. 31, 2023 USD ($) item state
Debt Securities, Available-for-sale [Line Items] |  |
Number of municipal bond | item | 227 | 485
Investment securities available for sale | $ 741,789 | $ 1,019,201
States and Political Subdivisions [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Number of municipalities and agencies | item | 191 | 398
Number of states | state | 28 | 36
Fair market value (available-for-sale securities and held-to-maturity securities) | $ 219,810 | $ 372,371
Investment securities available for sale | 44,675 | 194,206
General Obligation Bonds [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair market value (available-for-sale securities and held-to-maturity securities) | 194,620 | 324,643
General Obligation Bonds [Member] | City of New York [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | 5,300 | 5,300
Subordinate Debenture [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment securities available for sale | $ 54,700 | $ 52,000
Number of subordinated debentures owned | item | 51 | 51

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