Other Comprehensive Income (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accumulated other comprehensive income (loss), beginning balance	$ (79,309)
Net other comprehensive income (loss)	874	$ 19,992
Accumulated other comprehensive income (loss), ending balance	(78,435)
Net Unrealized Gains (Losses) on AFS Securities
Accumulated other comprehensive income (loss), beginning balance	(73,743)	(102,439)
Other comprehensive income (loss) before reclassifications	(1,334)	12,630
Amounts reclassed from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	(1,334)	12,630
Accumulated other comprehensive income (loss), ending balance	(75,077)	(89,809)
Net Unrealized Losses on Cash Flow Hedges
Accumulated other comprehensive income (loss), beginning balance	(3,142)	(7,938)
Other comprehensive income (loss) before reclassifications	568	(844)
Amounts reclassed from accumulated other comprehensive income (loss)	1,622	1,437
Net other comprehensive income (loss)	2,190	593
Accumulated other comprehensive income (loss), ending balance	(952)	(7,345)
Net Unrealized Losses on Defined Benefit Plan Obligations
Accumulated other comprehensive income (loss), beginning balance	(2,424)	(8,794)
Other comprehensive income (loss) before reclassifications	0	1,937
Amounts reclassed from accumulated other comprehensive income (loss)	18	4,832
Net other comprehensive income (loss)	18	6,769
Accumulated other comprehensive income (loss), ending balance	(2,406)	(2,025)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), beginning balance	(79,309)	(119,171)
Other comprehensive income (loss) before reclassifications	(766)	13,723
Amounts reclassed from accumulated other comprehensive income (loss)	1,640	6,269
Net other comprehensive income (loss)	874	19,992
Accumulated other comprehensive income (loss), ending balance	$ (78,435)	$ (99,179)