Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	$ 1,395,678	$ 759,201
Less than 12 Months, Unrealized Loss	(215,350)	(13,966)
12 Months or More, Fair Value	291,271	45,615
12 Months or More, Unrealized Loss	(53,278)	(1,683)
Total Fair Value	1,686,949	804,816
Total Unrealized Loss	(268,628)	(15,649)
U.S. Treasury and Agency Securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	1,493
Less than 12 Months, Unrealized Loss	(1)
12 Months or More, Fair Value	0
12 Months or More, Unrealized Loss	0
Total Fair Value	1,493
Total Unrealized Loss	(1)
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	695,986	165,210
Less than 12 Months, Unrealized Loss	(142,294)	(1,386)
12 Months or More, Fair Value	14,716	1,500
12 Months or More, Unrealized Loss	(4,778)	(94)
Total Fair Value	710,702	166,710
Total Unrealized Loss	(147,072)	(1,480)
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	499,905	467,888
Less than 12 Months, Unrealized Loss	(48,520)	(9,100)
12 Months or More, Fair Value	269,902	36,827
12 Months or More, Unrealized Loss	(47,657)	(1,381)
Total Fair Value	769,807	504,715
Total Unrealized Loss	(96,177)	(10,481)
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Less than 12 Months, Fair Value	198,294	126,103
Less than 12 Months, Unrealized Loss	(24,535)	(3,480)
12 Months or More, Fair Value	6,653	7,288
12 Months or More, Unrealized Loss	(843)	(208)
Total Fair Value	204,947	133,391
Total Unrealized Loss	$ (25,378)	$ (3,688)