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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 255,755
Available-for-sale investments, After 1 through 5 years	148,988
Available-for-sale investments, After 5 through 10 years	174,479
Available-for-sale investments, After ten years	536,330
Available-for-sale investments, Fair Value	$ 1,115,552	$ 1,171,572
Available-for-sale, Weighted average yield, One year or less (in hundredths)	2.04%
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths)	2.38%
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths)	2.26%
Available-for-sale , Weighted average yield,After ten years (in hundredths)	1.81%
Available-for-sale , Weighted average yield,Total (in hundredths)	2.01%
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths)	2.11%
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths)	2.88%
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths)	2.70%
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths)	1.83%
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths)	2.17%
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	2,298
Held-to-maturity	$ 2,298	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	$ 181,606
Available-for-sale investments, After 1 through 5 years	12,563
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	194,169	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	24,154
Available-for-sale investments, After 1 through 5 years	115,365
Available-for-sale investments, After 5 through 10 years	139,325
Available-for-sale investments, After ten years	1,600
Available-for-sale investments, Fair Value	280,444	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	3,068
Available-for-sale investments, After 1 through 5 years	4,677
Available-for-sale investments, After 5 through 10 years	34,374
Available-for-sale investments, After ten years	534,730
Available-for-sale investments, Fair Value	576,849	602,300
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	46,927
Available-for-sale investments, After 1 through 5 years	16,383
Available-for-sale investments, After 5 through 10 years	780
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	64,090	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	2,298
Held-to-maturity	$ 2,298	$ 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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The yield on an available-for-sale government security, when the effect of reduced taxes are taken into account, for securities that mature after one through five years. 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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-URI https://asc.fasb.org/1943274/2147481800/320-10-50-5

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 320
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477268/942-320-50-3

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