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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 5,967	$ 22,824
Available-for-sale, Less than 12 months, Unrealized Losses	(33)	(1,266)
Available-for-sale, 12 months or longer, Fair Value	914,868	1,001,277
Available-for-sale, 12 months or longer, Unrealized losses	(153,515)	(193,568)
Available-for-sale, Total Fair Value	920,835	1,024,101
Available-for-sale, Total Unrealized Losses	(153,548)	(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	790	1,340
Available-for-sale, Less than 12 months, Unrealized Losses	0	0
Available-for-sale, 12 months or longer, Fair Value	151,518	189,327
Available-for-sale, 12 months or longer, Unrealized losses	(11,147)	(21,158)
Available-for-sale, Total Fair Value	152,308	190,667
Available-for-sale, Total Unrealized Losses	(11,147)	(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	2,361	20,349
Available-for-sale, Less than 12 months, Unrealized Losses	(15)	(1,248)
Available-for-sale, 12 months or longer, Fair Value	243,565	241,502
Available-for-sale, 12 months or longer, Unrealized losses	(53,805)	(55,193)
Available-for-sale, Total Fair Value	245,926	261,851
Available-for-sale, Total Unrealized Losses	(53,820)	(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	2,816	1,135
Available-for-sale, Less than 12 months, Unrealized Losses	(18)	(18)
Available-for-sale, 12 months or longer, Fair Value	490,374	511,746
Available-for-sale, 12 months or longer, Unrealized losses	(87,381)	(114,552)
Available-for-sale, Total Fair Value	493,190	512,881
Available-for-sale, Total Unrealized Losses	(87,399)	(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	29,411	58,702
Available-for-sale, 12 months or longer, Unrealized losses	(1,182)	(2,665)
Available-for-sale, Total Fair Value	29,411	58,702
Available-for-sale, Total Unrealized Losses	$ (1,182)	$ (2,665)

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