Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,871,260	$ 2,094,826
Gross Unrealized Gains	1,337	695
Gross Unrealized Losses	(275,765)	(333,852)
Fair Value	1,596,832	1,761,669
U.S. Treasury
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	0	64,097
Gross Unrealized Gains	0	22
Gross Unrealized Losses	0	0
Fair Value	0	64,119
Obligations of State and Political Subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	889,940	939,193
Gross Unrealized Gains	1,309	673
Gross Unrealized Losses	(122,374)	(162,014)
Fair Value	768,875	777,852
MBS/CMO
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	761,025	846,519
Gross Unrealized Gains	28	0
Gross Unrealized Losses	(116,013)	(131,838)
Fair Value	645,040	714,681
US Gov’t Sponsored Entities & Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	220,295	245,017
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(37,378)	(40,000)
Fair Value	$ 182,917	$ 205,017