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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 19,830	$ 22,824
Available-for-sale, Less than 12 months, Unrealized Losses	(1,350)	(1,266)
Available-for-sale, 12 months or longer, Fair Value	977,677	1,001,277
Available-for-sale, 12 months or longer, Unrealized losses	(184,984)	(193,568)
Available-for-sale, Total Fair Value	997,507	1,024,101
Available-for-sale, Total Unrealized Losses	(186,334)	(194,834)
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	1,091	1,340
Available-for-sale, Less than 12 months, Unrealized Losses	(2)	0
Available-for-sale, 12 months or longer, Fair Value	183,392	189,327
Available-for-sale, 12 months or longer, Unrealized losses	(18,144)	(21,158)
Available-for-sale, Total Fair Value	184,483	190,667
Available-for-sale, Total Unrealized Losses	(18,146)	(21,158)
Obligations of States and Political Subdivisions
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	17,581	20,349
Available-for-sale, Less than 12 months, Unrealized Losses	(1,343)	(1,248)
Available-for-sale, 12 months or longer, Fair Value	237,147	241,502
Available-for-sale, 12 months or longer, Unrealized losses	(60,804)	(55,193)
Available-for-sale, Total Fair Value	254,728	261,851
Available-for-sale, Total Unrealized Losses	(62,147)	(56,441)
Mortgage-backed Securities: GSE Residential
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	1,158	1,135
Available-for-sale, Less than 12 months, Unrealized Losses	(5)	(18)
Available-for-sale, 12 months or longer, Fair Value	503,901	511,746
Available-for-sale, 12 months or longer, Unrealized losses	(103,886)	(114,552)
Available-for-sale, Total Fair Value	505,059	512,881
Available-for-sale, Total Unrealized Losses	(103,891)	(114,570)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	0	0
Available-for-sale, Less than 12 months, Unrealized Losses	0	0
Available-for-sale, 12 months or longer, Fair Value	53,237	58,702
Available-for-sale, 12 months or longer, Unrealized losses	(2,150)	(2,665)
Available-for-sale, Total Fair Value	53,237	58,702
Available-for-sale, Total Unrealized Losses	$ (2,150)	$ (2,665)

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