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Investments - Estimated Fair Value of Contractual Maturities - Held-to-Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract]
Maturing within one year (remainder of year), Amortized Cost	$ 145
Maturing within one year	0	$ 145
Maturing after one year through five years	2,401	2,413
Maturing after five years through ten years	19,362	19,895
Maturing after ten years	155,289	155,325
Amortized Cost	316,422	320,073
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Maturing within one year (remainder of year), Fair Value	145
Maturing within one year, Fair Value	0	145
Maturing after one year through five years, Fair Value	2,358	2,384
Maturing after five years through ten years, Fair Value	17,771	18,350
Maturing after ten years, Fair Value	159,242	162,191
Estimated Fair Value	306,156	314,924
Mortgage-Backed Securities [Member]
Debt Securities, Held-to-Maturity, Amortized Cost, before Allowance for Credit Loss, Maturity, Allocated and Single Maturity Date [Abstract]
Securities not due at a single maturity date, Amortized Cost	139,225	142,295
Amortized Cost	139,225	142,295
Debt Securities, Held-to-Maturity, Maturity, Allocated and Single Maturity Date, Fair Value [Abstract]
Securities not due at a single maturity date, Fair Value	126,640	131,854
Estimated Fair Value	$ 126,640	$ 131,854

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