Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated other comprehensive income (loss), beginning balance	$ (119,171)
Net other comprehensive income (loss)	19,992	$ (7,760)
Accumulated other comprehensive income (loss), ending balance	(99,179)
Net Unrealized Gains (Losses) on AFS Securities
Accumulated other comprehensive income (loss), beginning balance	(102,439)	(116,591)
Other comprehensive income (loss) before reclassifications	12,630	(10,988)
Amounts reclassed from accumulated other comprehensive income (loss)	0	0
Net other comprehensive income (loss)	12,630	(10,988)
Accumulated other comprehensive income (loss), ending balance	(89,809)	(127,579)
Net Unrealized Losses on Cash Flow Hedges
Accumulated other comprehensive income (loss), beginning balance	(7,938)	(15,619)
Other comprehensive income (loss) before reclassifications	(844)	1,979
Amounts reclassed from accumulated other comprehensive income (loss)	1,437	1,226
Net other comprehensive income (loss)	593	3,205
Accumulated other comprehensive income (loss), ending balance	(7,345)	(12,414)
Net Unrealized Losses on Defined Benefit Plan Obligations
Accumulated other comprehensive income (loss), beginning balance	(8,794)	(8,943)
Other comprehensive income (loss) before reclassifications	1,937	0
Amounts reclassed from accumulated other comprehensive income (loss)	4,832	23
Net other comprehensive income (loss)	6,769	23
Accumulated other comprehensive income (loss), ending balance	(2,025)	(8,920)
Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), beginning balance	(119,171)	(141,153)
Other comprehensive income (loss) before reclassifications	13,723	(9,009)
Amounts reclassed from accumulated other comprehensive income (loss)	6,269	1,249
Net other comprehensive income (loss)	19,992	(7,760)
Accumulated other comprehensive income (loss), ending balance	$ (99,179)	$ (148,913)