Securities - Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,769,174	$ 1,871,260
Gross Unrealized Gains	6,633	1,337
Gross Unrealized Losses	(227,813)	(275,765)
Fair Value	1,547,994	1,596,832
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	116,385	0
Gross Unrealized Gains	78	0
Gross Unrealized Losses	0	0
Fair Value	116,463	0
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	583,453	889,940
Gross Unrealized Gains	43	1,309
Gross Unrealized Losses	(105,095)	(122,374)
Fair Value	478,401	768,875
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	812,528	761,025
Gross Unrealized Gains	5,586	28
Gross Unrealized Losses	(93,042)	(116,013)
Fair Value	725,072	645,040
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	256,808	220,295
Gross Unrealized Gains	926	0
Gross Unrealized Losses	(29,676)	(37,378)
Fair Value	$ 228,058	$ 182,917