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Investments - Amortized Cost and Estimated Fair Value - Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | $ 316,422 | $ 320,073
Gross Unrecognized Gains | 2,971 | 5,909
Gross Unrecognized Losses | (13,237) | (11,058)
Securities held-to-maturity | 306,156 | 314,924
Allowance for credit losses on held-to-maturity securities | (16) | (16)
U.S. Government Agencies [Member] |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 5,033 | 5,522
Gross Unrecognized Losses | (652) | (617)
Securities held-to-maturity | 4,381 | 4,905
Mortgage-Backed Securities [Member] |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 139,225 | 142,295
Gross Unrecognized Losses | (12,585) | (10,441)
Securities held-to-maturity | 126,640 | 131,854
States and Political Subdivisions [Member] |  |
Debt Securities, Held-to-Maturity, Fair Value to Amortized Cost, after Allowance for Credit Loss [Abstract] |  |
Amortized Cost | 172,164 | 172,256
Gross Unrecognized Gains | 2,971 | 5,909
Securities held-to-maturity | 175,135 | 178,165
Allowance for credit losses on held-to-maturity securities | $ (16) | $ (16)

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