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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Available-for-sale: [Abstract]
Amortized Cost	$ 1,274,661	$ 1,363,721
Gross Unrealized Gains	1,820	1,310
Gross Unrealized (Losses)	(160,929)	(193,459)
Fair Value	1,115,552	1,171,572
Held-to-maturity: [Abstract]
Held-to-maturity	2,298	2,286
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	2,298	2,286
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	212,259	237,875
Gross Unrealized Gains	1	0
Gross Unrealized (Losses)	(18,091)	(26,219)
Fair Value	194,169	211,656
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	326,751	337,835
Gross Unrealized Gains	255	152
Gross Unrealized (Losses)	(46,562)	(49,371)
Fair Value	280,444	288,616
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	668,554	714,216
Gross Unrealized Gains	1,564	1,158
Gross Unrealized (Losses)	(93,269)	(113,074)
Fair Value	576,849	602,300
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	67,097	73,795
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(3,007)	(4,795)
Fair Value	64,090	69,000
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,298	2,286
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,298	$ 2,286

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