Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	$ 1,337,529	$ 759,201
Less than 12 Months, Unrealized Loss	(120,954)	(13,966)
12 Months or More, Fair Value	303,631	45,615
12 Months or More, Unrealized Loss	(35,038)	(1,683)
Total Fair Value	1,641,160	804,816
Total Unrealized Loss	(155,992)	(15,649)
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	648,624	165,210
Less than 12 Months, Unrealized Loss	(75,715)	(1,386)
12 Months or More, Fair Value	11,405	1,500
12 Months or More, Unrealized Loss	(2,081)	(94)
Total Fair Value	660,029	166,710
Total Unrealized Loss	(77,796)	(1,480)
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	480,333	467,888
Less than 12 Months, Unrealized Loss	(30,102)	(9,100)
12 Months or More, Fair Value	285,351	36,827
12 Months or More, Unrealized Loss	(32,335)	(1,381)
Total Fair Value	765,684	504,715
Total Unrealized Loss	(62,437)	(10,481)
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	208,572	126,103
Less than 12 Months, Unrealized Loss	(15,137)	(3,480)
12 Months or More, Fair Value	6,875	7,288
12 Months or More, Unrealized Loss	(622)	(208)
Total Fair Value	215,447	133,391
Total Unrealized Loss	$ (15,759)	$ (3,688)