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Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 244,838
Available-for-sale investments, After 1 through 5 years	159,585
Available-for-sale investments, After 5 through 10 years	123,704
Available-for-sale investments, After ten years	548,714
Available-for-sale investments, Fair Value	$ 1,076,841	$ 1,063,292
Available-for-sale, Weighted average yield, One year or less (in hundredths)	2.02%
Available-for-sale, Weighted average yield, After 1 through 5 years (in hundredths)	2.25%
Available-for-sale, Weighted average yield, After 5 through 10 years (in hundredths)	2.28%
Available-for-sale, Weighted average yield, After ten years (in hundredths)	2.13%
Available-for-sale, Weighted average yield, Total (in hundredths)	2.14%
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths)	2.14%
Available-for-sale, Full Tax-equivalent yield, After 1 through 5 years (in hundredths)	2.77%
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)	2.14%
Available-for-sale, Full Tax-equivalent yield, Total (in hundredths)	2.31%
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	2,287
Held-to-maturity	$ 2,287	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	$ 173,774
Available-for-sale investments, After 1 through 5 years	9,842
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	183,616	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	35,798
Available-for-sale investments, After 1 through 5 years	134,711
Available-for-sale investments, After 5 through 10 years	88,303
Available-for-sale investments, After ten years	2,512
Available-for-sale investments, Fair Value	261,324	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	28
Available-for-sale investments, After 1 through 5 years	7,914
Available-for-sale investments, After 5 through 10 years	34,567
Available-for-sale investments, After ten years	546,202
Available-for-sale investments, Fair Value	588,711	539,742
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	35,238
Available-for-sale investments, After 1 through 5 years	7,118
Available-for-sale investments, After 5 through 10 years	834
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	43,190	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	2,287
Held-to-maturity	$ 2,287	$ 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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-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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