Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Available-for-sale: [Abstract]
Amortized Cost	$ 1,342,603	$ 1,363,721
Gross Unrealized Gains	938	1,310
Gross Unrealized (Losses)	(204,114)	(193,459)
Fair Value	1,139,427	1,171,572
Held-to-maturity: [Abstract]
Held-to-maturity	2,282	2,286
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	2,282	2,286
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	234,540	237,875
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(27,220)	(26,219)
Fair Value	207,320	211,656
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	335,350	337,835
Gross Unrealized Gains	84	152
Gross Unrealized (Losses)	(52,864)	(49,371)
Fair Value	282,570	288,616
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	699,921	714,216
Gross Unrealized Gains	854	1,158
Gross Unrealized (Losses)	(119,771)	(113,074)
Fair Value	581,004	602,300
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	72,792	73,795
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(4,259)	(4,795)
Fair Value	68,533	69,000
Other Investments
Held-to-maturity: [Abstract]
Held-to-maturity	2,282	2,286
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,282	$ 2,286

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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