Securities - Schedule of Securities Available-for-Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,887,702	$ 1,865,732
Gross Unrealized Gains	4,205	6,453
Gross Unrealized Losses	(224,977)	(214,791)
Fair Value	1,666,930	1,657,394
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	135,400	152,026
Gross Unrealized Gains	11	64
Gross Unrealized Losses	0	0
Fair Value	135,411	152,090
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	603,340	603,528
Gross Unrealized Gains	484	822
Gross Unrealized Losses	(117,289)	(106,744)
Fair Value	486,535	497,606
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	819,691	795,574
Gross Unrealized Gains	2,684	4,714
Gross Unrealized Losses	(81,447)	(80,746)
Fair Value	740,928	719,542
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	329,271	314,604
Gross Unrealized Gains	1,026	853
Gross Unrealized Losses	(26,241)	(27,301)
Fair Value	$ 304,056	$ 288,156