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Investment Securities - Fair Value of Investments with Sustained Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	$ 14,102	$ 34,698
Available-for-sale, Less than 12 months, Unrealized Losses	(833)	(843)
Available-for-sale, 12 months or longer, Fair Value	1,050,204	1,075,835
Available-for-sale, 12 months or longer, Unrealized losses	(160,096)	(192,616)
Available-for-sale, Total Fair Value	1,064,306	1,110,533
Available-for-sale, Total Unrealized Losses	(160,929)	(193,459)
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	300	1,288
Available-for-sale, Less than 12 months, Unrealized Losses	0	(4)
Available-for-sale, 12 months or longer, Fair Value	193,524	210,069
Available-for-sale, 12 months or longer, Unrealized losses	(18,091)	(26,215)
Available-for-sale, Total Fair Value	193,824	211,357
Available-for-sale, Total Unrealized Losses	(18,091)	(26,219)
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	13,802	22,281
Available-for-sale, Less than 12 months, Unrealized Losses	(833)	(333)
Available-for-sale, 12 months or longer, Fair Value	251,107	241,630
Available-for-sale, 12 months or longer, Unrealized losses	(45,729)	(49,038)
Available-for-sale, Total Fair Value	264,909	263,911
Available-for-sale, Total Unrealized Losses	(46,562)	(49,371)
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	0	5,818
Available-for-sale, Less than 12 months, Unrealized Losses	0	(67)
Available-for-sale, 12 months or longer, Fair Value	547,233	566,197
Available-for-sale, 12 months or longer, Unrealized losses	(93,269)	(113,007)
Available-for-sale, Total Fair Value	547,233	572,015
Available-for-sale, Total Unrealized Losses	(93,269)	(113,074)
Other Securities
Available-for-sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Available-for-sale, Less than 12 months, Fair Value	0	5,311
Available-for-sale, Less than 12 months, Unrealized Losses	0	(439)
Available-for-sale, 12 months or longer, Fair Value	58,340	57,939
Available-for-sale, 12 months or longer, Unrealized losses	(3,007)	(4,356)
Available-for-sale, Total Fair Value	58,340	63,250
Available-for-sale, Total Unrealized Losses	$ (3,007)	$ (4,795)

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