Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated other comprehensive income (loss), beginning balance	$ (7,391)
Total other comprehensive income (loss), net of tax	(12,615)	$ 12,166
Accumulated other comprehensive income (loss), ending balance	(20,006)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	9,881	3,226
Other comprehensive income (loss) before reclassifications	(13,319)	12,806
Amounts reclassed from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss), net of tax	(13,319)	12,806
Accumulated other comprehensive income (loss), ending balance	(3,438)	16,032
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(1,447)	(793)
Other comprehensive income (loss) before reclassifications	83	(1,072)
Amounts reclassed from accumulated other comprehensive income (loss)	214	22
Total other comprehensive income (loss), net of tax	297	(1,050)
Accumulated other comprehensive income (loss), ending balance	(1,150)	(1,843)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(15,825)	(13,670)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	407	410
Total other comprehensive income (loss), net of tax	407	410
Accumulated other comprehensive income (loss), ending balance	(15,418)	(13,260)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(7,391)	(11,237)
Other comprehensive income (loss) before reclassifications	(13,236)	11,734
Amounts reclassed from accumulated other comprehensive income (loss)	621	432
Total other comprehensive income (loss), net of tax	(12,615)	12,166
Accumulated other comprehensive income (loss), ending balance	$ (20,006)	$ 929