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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Available-for-sale: [Abstract]
Amortized Cost	$ 1,225,046	$ 1,257,436
Gross Unrealized Gains	1,015	690
Gross Unrealized (Losses)	(186,334)	(194,834)
Fair Value	1,039,727	1,063,292
Held-to-maturity: [Abstract]
Held-to-maturity	2,285	2,279
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	2,285	2,279
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	203,079	212,513
Gross Unrealized Gains	0	3
Gross Unrealized (Losses)	(18,146)	(21,158)
Fair Value	184,933	191,358
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	324,071	324,046
Gross Unrealized Gains	181	135
Gross Unrealized (Losses)	(62,147)	(56,441)
Fair Value	262,105	267,740
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	636,759	653,760
Gross Unrealized Gains	834	552
Gross Unrealized (Losses)	(103,891)	(114,570)
Fair Value	533,702	539,742
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	61,137	67,117
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(2,150)	(2,665)
Fair Value	58,987	64,452
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,285	2,279
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	0	0
Fair Value	$ 2,285	$ 2,279

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