Investments - Amortized Cost and Estimated Fair Value - Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
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)

Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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Amount excluding accrued interest, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

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Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

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Fair value of investment in debt security measured at amortized cost (held-to-maturity).

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