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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 233,192
Available-for-sale investments, After 1 through 5 years	173,874
Available-for-sale investments, After 5 through 10 years	192,406
Available-for-sale investments, After ten years	539,955
Available-for-sale investments, Fair Value	$ 1,139,427	$ 1,171,572
Available-for-sale, Weighted average yield, One year or less (in hundredths)	1.75%
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths)	2.62%
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)	1.75%
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths)	2.63%
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths)	2.22%
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths)	1.84%
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	2,282
Held-to-maturity	$ 2,282	2,286
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	$ 181,730
Available-for-sale investments, After 1 through 5 years	25,590
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	207,320	211,656
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	21,240
Available-for-sale investments, After 1 through 5 years	102,416
Available-for-sale investments, After 5 through 10 years	157,672
Available-for-sale investments, After ten years	1,242
Available-for-sale investments, Fair Value	282,570	288,616
Mortgage-backed Securities: GSE Residential
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	2,280
Available-for-sale investments, After 1 through 5 years	6,030
Available-for-sale investments, After 5 through 10 years	33,981
Available-for-sale investments, After ten years	538,713
Available-for-sale investments, Fair Value	581,004	602,300
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	27,942
Available-for-sale investments, After 1 through 5 years	39,838
Available-for-sale investments, After 5 through 10 years	753
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	68,533	69,000
Other Investments
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	2,282
Held-to-maturity	$ 2,282	$ 2,286

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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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