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Investments in Securities - Held to maturity securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
HELD-TO-MATURITY SECURITIES: |  |
Amortized Cost | $ 195,088 | $ 202,377
Fair Value Adjustment | (65) | 118
Amortized Carrying Value | 195,023 | 202,495
Gross Unrealized Losses | 23,830 | 24,730
Fair Value | 171,193 | 177,765
Agency mortgage-backed securities |  |
HELD-TO-MATURITY SECURITIES: |  |
Amortized Cost | 72,495 | 73,891
Fair Value Adjustment | 2,436 | 3,015
Amortized Carrying Value | 74,931 | 76,906
Gross Unrealized Losses | 8,686 | 9,820
Fair Value | 66,245 | 67,086
Agency collateralized mortgage obligations |  |
HELD-TO-MATURITY SECURITIES: |  |
Amortized Cost | 116,405 | 122,247
Fair Value Adjustment | (2,502) | (2,885)
Amortized Carrying Value | 113,903 | 119,362
Gross Unrealized Losses | 14,662 | 14,129
Fair Value | 99,241 | 105,233
States and political subdivisions |  |
HELD-TO-MATURITY SECURITIES: |  |
Amortized Cost | 6,188 | 6,239
Fair Value Adjustment | 1 | (12)
Amortized Carrying Value | 6,189 | 6,227
Gross Unrealized Losses | 482 | 781
Fair Value | $ 5,707 | $ 5,446

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