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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 228,746
Available-for-sale investments, After 1 through 5 years	177,961
Available-for-sale investments, After 5 through 10 years	204,838
Available-for-sale investments, After ten years	560,027
Available-for-sale investments, Fair Value	$ 1,171,572	$ 1,218,985
Available-for-sale, Weighted average yield, One year or less (in hundredths)	1.67%
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths)	2.70%
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths)	2.25%
Available-for-sale , Weighted average yield,After ten years (in hundredths)	1.82%
Available-for-sale , Weighted average yield,Total (in hundredths)	2.00%
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths)	1.68%
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths)	2.70%
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths)	2.24%
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths)	1.83%
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths)	2.00%
Held-to-maturity, Maturity [Abstract]
Held-to-maturity, One Year or less	$ 0
Held-to-maturity, After1 through 5 years	0
Held-to-maturity, After 5 through 10 years	0
Held-to-maturity, After ten years	2,286
Held-to-maturity	$ 2,286	2,954
Held To Maturity Weighted average yield, One year or less	0.00%
Held To Maturity Weighted average yield, After 1 through 5 years	0.00%
Held To Maturity Weighted average yield After 5 through 10 years	0.00%
Held To Maturity Weighted average yield After ten years	0.00%
Held To Maturity Weighted average yield ,Total	0.00%
Held To Maturity, Full tax-equivalent yield , One year or less	0.00%
Held To Maturity, Full tax-equivalent yield , After 1 through 5 years	0.00%
Held To Maturity, Full tax-equivalent yield , After 5 through 10 years	0.00%
Held To Maturity, Full tax-equivalent yield , After ten years	0.00%
Held To Maturity, Full tax-equivalent yield , Total	0.00%
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 185,981
Available-for-sale investments, After 1 through 5 years	25,675
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	211,656	220,527
Obligations of States and Political Subdivisions
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	20,879
Available-for-sale investments, After 1 through 5 years	97,328
Available-for-sale investments, After 5 through 10 years	169,111
Available-for-sale investments, After ten years	1,298
Available-for-sale investments, Fair Value	288,616	287,698
Mortgage-backed Securities: GSE Residential
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	10
Available-for-sale investments, After 1 through 5 years	8,566
Available-for-sale investments, After 5 through 10 years	34,995
Available-for-sale investments, After ten years	558,729
Available-for-sale investments, Fair Value	602,300	627,880
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	21,876
Available-for-sale investments, After 1 through 5 years	46,392
Available-for-sale investments, After 5 through 10 years	732
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	69,000	82,880
Held-to-maturity, Maturity [Abstract]
Held-to-maturity, One Year or less	0
Held-to-maturity, After1 through 5 years	0
Held-to-maturity, After 5 through 10 years	0
Held-to-maturity, After ten years	2,286
Held-to-maturity	$ 2,286	$ 2,954

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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature. The full tax-equivalent yield show what yield a fully taxable security would have to give, in order to be equivalent to a tax free government security.

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Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth through tenth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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