Investment Securities - Available for Sale and Held for Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available-for-sale: [Abstract]
Amortized Cost	$ 1,363,721	$ 1,432,372
Gross Unrealized Gains	1,310	143
Gross Unrealized (Losses)	(193,459)	(213,530)
Fair Value	1,171,572	1,218,985
Held-to-maturity: [Abstract]
Held-to-maturity	2,286	2,954
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	2,286	2,954
U.S. Treasury Securities and Obligations of U.S. Government Corporations and Agencies
Available-for-sale: [Abstract]
Amortized Cost	237,875	252,934
Gross Unrealized Gains	0	0
Gross Unrealized (Losses)	(26,219)	(32,407)
Fair Value	211,656	220,527
Obligations of States and Political Subdivisions
Available-for-sale: [Abstract]
Amortized Cost	337,835	347,409
Gross Unrealized Gains	152	134
Gross Unrealized (Losses)	(49,371)	(59,845)
Fair Value	288,616	287,698
Mortgage-backed Securities: GSE Residential
Available-for-sale: [Abstract]
Amortized Cost	714,216	744,636
Gross Unrealized Gains	1,158	3
Gross Unrealized (Losses)	(113,074)	(116,759)
Fair Value	602,300	627,880
Other Securities
Available-for-sale: [Abstract]
Amortized Cost	73,795	87,393
Gross Unrealized Gains	0	6
Gross Unrealized (Losses)	(4,795)	(4,519)
Fair Value	69,000	82,880
Held-to-maturity: [Abstract]
Held-to-maturity	2,286	2,954
Gross Unrealized Gains	0	0
Unrealized (Losses)	0	0
Fair Value	$ 2,286	$ 2,954

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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