Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated other comprehensive income (loss), beginning balance	$ (19,981)
Total other comprehensive income (loss), net of tax	(59,470)	$ (12,615)
Accumulated other comprehensive income (loss), ending balance	(79,451)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	(6,795)	9,881
Other comprehensive income (loss) before reclassifications	(49,460)	(13,319)
Amounts reclassed from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss), net of tax	(49,460)	(13,319)
Accumulated other comprehensive income (loss), ending balance	(56,255)	(3,438)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(4,013)	(1,447)
Other comprehensive income (loss) before reclassifications	(10,033)	83
Amounts reclassed from accumulated other comprehensive income (loss)	(302)	214
Total other comprehensive income (loss), net of tax	(10,335)	297
Accumulated other comprehensive income (loss), ending balance	(14,348)	(1,150)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(9,173)	(15,825)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	325	407
Total other comprehensive income (loss), net of tax	325	407
Accumulated other comprehensive income (loss), ending balance	(8,848)	(15,418)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(19,981)	(7,391)
Other comprehensive income (loss) before reclassifications	(59,493)	(13,236)
Amounts reclassed from accumulated other comprehensive income (loss)	23	621
Total other comprehensive income (loss), net of tax	(59,470)	(12,615)
Accumulated other comprehensive income (loss), ending balance	$ (79,451)	$ (20,006)