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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 249,596
Available-for-sale investments, After 1 through 5 years	154,954
Available-for-sale investments, After 5 through 10 years	132,164
Available-for-sale investments, After ten years	503,013
Available-for-sale investments, Fair Value	$ 1,039,727	$ 1,063,292
Available-for-sale, Weighted average yield, One year or less (in hundredths)	2.06%
Available-for-sale, Weighted average yield, After 1 through 5 years (in hundredths)	2.33%
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)	1.80%
Available-for-sale, Weighted average yield, Total (in hundredths)	2.00%
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths)	2.17%
Available-for-sale, Full Tax-equivalent yield, After 1 through 5 years (in hundredths)	2.82%
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths)	2.69%
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, After 1 through 5 years	0
Held-to-maturity, After 5 through 10 years	0
Held-to-maturity, After ten years	2,285
Held-to-maturity	$ 2,285	2,279
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	$ 173,943
Available-for-sale investments, After 1 through 5 years	10,990
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	184,933	191,358
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	30,126
Available-for-sale investments, After 1 through 5 years	123,008
Available-for-sale investments, After 5 through 10 years	100,221
Available-for-sale investments, After ten years	8,750
Available-for-sale investments, Fair Value	262,105	267,740
Mortgage-backed Securities: GSE Residential
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	116
Available-for-sale investments, After 1 through 5 years	8,194
Available-for-sale investments, After 5 through 10 years	31,129
Available-for-sale investments, After ten years	494,263
Available-for-sale investments, Fair Value	533,702	539,742
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	45,411
Available-for-sale investments, After 1 through 5 years	12,762
Available-for-sale investments, After 5 through 10 years	814
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	58,987	64,452
Other Investments
Held-to-maturity, Maturity [Abstract]
Held-to-maturity, One Year or less	0
Held-to-maturity, After 1 through 5 years	0
Held-to-maturity, After 5 through 10 years	0
Held-to-maturity, After ten years	2,285
Held-to-maturity	$ 2,285	$ 2,279

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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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