Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 259,394
Available-for-sale investments, After 1 through 5 years	144,795
Available-for-sale investments, After 5 through 10 years	152,141
Available-for-sale investments, After ten years	506,962
Available-for-sale investments, Fair Value	$ 1,063,292	$ 1,171,572
Available-for-sale, Weighted average yield, One year or less (in hundredths)	2.08%
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)	2.24%
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)	2.19%
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	2,279
Held-to-maturity	$ 2,279	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	$ 178,548
Available-for-sale investments, After 1 through 5 years	12,810
Available-for-sale investments, After 5 through 10 years	0
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	191,358	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	26,780
Available-for-sale investments, After 1 through 5 years	114,045
Available-for-sale investments, After 5 through 10 years	117,825
Available-for-sale investments, After ten years	9,090
Available-for-sale investments, Fair Value	267,740	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	3,065
Available-for-sale investments, After 1 through 5 years	5,299
Available-for-sale investments, After 5 through 10 years	33,506
Available-for-sale investments, After ten years	497,872
Available-for-sale investments, Fair Value	539,742	602,300
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	51,001
Available-for-sale investments, After 1 through 5 years	12,641
Available-for-sale investments, After 5 through 10 years	810
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	64,452	69,000
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	2,279
Held-to-maturity	$ 2,279	$ 2,286

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.

No definition available.