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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Available-for-sale: [Abstract]
Amortized Cost	$ 1,240,956	$ 1,257,436
Gross Unrealized Gains	2,827	690
Gross Unrealized (Losses)	(153,548)	(194,834)
Fair Value	1,090,235	1,063,292
Held-to-maturity: [Abstract]
Held-to-maturity	2,290	2,279
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	2,290	2,279
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	163,905	212,513
Gross Unrealized Gains	1	3
Gross Unrealized (Losses)	(11,147)	(21,158)
Fair Value	152,759	191,358
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	326,020	324,046
Gross Unrealized Gains	308	135
Gross Unrealized (Losses)	(53,820)	(56,441)
Fair Value	272,508	267,740
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	714,690	653,760
Gross Unrealized Gains	2,515	552
Gross Unrealized (Losses)	(87,399)	(114,570)
Fair Value	629,806	539,742
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	36,341	67,117
Gross Unrealized Gains	3	0
Gross Unrealized (Losses)	(1,182)	(2,665)
Fair Value	35,162	64,452
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,290	2,279
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	$ 2,290	$ 2,279

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