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Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Available-for-sale: [Abstract]
Amortized Cost	$ 1,311,109	$ 1,363,721
Gross Unrealized Gains	989	1,310
Gross Unrealized (Losses)	(201,448)	(193,459)
Fair Value	1,110,650	1,171,572
Held-to-maturity: [Abstract]
Held-to-maturity	2,277	2,286
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	2,277	2,286
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	224,831	237,875
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(25,249)	(26,219)
Fair Value	199,582	211,656
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	334,386	337,835
Gross Unrealized Gains	132	152
Gross Unrealized (Losses)	(57,452)	(49,371)
Fair Value	277,066	288,616
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	684,817	714,216
Gross Unrealized Gains	857	1,158
Gross Unrealized (Losses)	(114,620)	(113,074)
Fair Value	571,054	602,300
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	67,075	73,795
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(4,127)	(4,795)
Fair Value	62,948	69,000
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,277	2,286
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,277	$ 2,286

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