Investment Securities - Investments Classified by Contractual Maturity Date (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	$ 206,532
Available-for-sale investments, After 1 through 5 years	283,900
Available-for-sale investments, After 5 through 10 years	725,759
Available-for-sale investments, After ten years	2,794
Available-for-sale investments, Fair Value	$ 1,218,985	$ 1,421,422
Available-for-sale, Weighted average yield, One year or less (in hundredths)	1.56%
Available-for-sale , Weighted average yield,After 1 through 5 years (in hundredths)	2.44%
Available-for-sale, Weighted average yield,After 5 through 10 years (in hundredths)	1.75%
Available-for-sale , Weighted average yield,After ten years (in hundredths)	2.92%
Available-for-sale , Weighted average yield,Total (in hundredths)	1.87%
Available-for-sale, Full Tax-equivalent yield, One year or less (in hundredths)	1.66%
Available-for-sale, Full Tax-equivalent yield,After 1 through 5 years (in hundredths)	2.70%
Available-for-sale, Full Tax-equivalent yield, After 5 through 10 years (in hundredths)	1.92%
Available-for-sale, Full Tax-equivalent yield,After ten years (in hundredths)	3.44%
Available-for-sale, Full Tax-equivalent yield,Total (in hundredths)	2.05%
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	2,954
Held-to-maturity	$ 2,954	7,030
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	$ 161,688
Available-for-sale investments, After 1 through 5 years	49,187
Available-for-sale investments, After 5 through 10 years	9,652
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	220,527	203,815
Held-to-maturity, Maturity [Abstract]
Held-to-maturity		5,001
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	19,446
Available-for-sale investments, After 1 through 5 years	76,847
Available-for-sale investments, After 5 through 10 years	190,232
Available-for-sale investments, After ten years	1,173
Available-for-sale investments, Fair Value	287,698	395,457
Mortgage-backed Securities: GSE Residential
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	4,762
Available-for-sale investments, After 1 through 5 years	97,333
Available-for-sale investments, After 5 through 10 years	524,164
Available-for-sale investments, After ten years	1,621
Available-for-sale investments, Fair Value	627,880	791,038
Other Securities
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract]
Available-for-sale investments, One year or less	20,636
Available-for-sale investments, After 1 through 5 years	60,533
Available-for-sale investments, After 5 through 10 years	1,711
Available-for-sale investments, After ten years	0
Available-for-sale investments, Fair Value	82,880	31,112
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	2,954
Held-to-maturity	$ 2,954	$ 2,029