Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated other comprehensive income (loss), beginning balance			$ (7,391)
Total other comprehensive income (loss), net of tax	$ (3,000)	$ (2,941)	(10,737)	$ 7,834
Accumulated other comprehensive income (loss), ending balance	(18,128)		(18,128)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	696	14,224	9,881	3,226
Other comprehensive income (loss) before reclassifications	(3,137)	(3,505)	(12,322)	7,493
Amounts reclassed from accumulated other comprehensive income (loss)	0	0	0	0
Total other comprehensive income (loss), net of tax	(3,137)	(3,505)	(12,322)	7,493
Accumulated other comprehensive income (loss), ending balance	(2,441)	10,719	(2,441)	10,719
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(1,080)	(1,835)	(1,447)	(793)
Other comprehensive income (loss) before reclassifications	(219)	(107)	(16)	(1,521)
Amounts reclassed from accumulated other comprehensive income (loss)	(184)	261	(20)	633
Total other comprehensive income (loss), net of tax	(403)	154	(36)	(888)
Accumulated other comprehensive income (loss), ending balance	(1,483)	(1,681)	(1,483)	(1,681)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(14,744)	(12,851)	(15,825)	(13,670)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	540	410	1,621	1,229
Total other comprehensive income (loss), net of tax	540	410	1,621	1,229
Accumulated other comprehensive income (loss), ending balance	(14,204)	(12,441)	(14,204)	(12,441)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(15,128)	(462)	(7,391)	(11,237)
Other comprehensive income (loss) before reclassifications	(3,356)	(3,612)	(12,338)	5,972
Amounts reclassed from accumulated other comprehensive income (loss)	356	671	1,601	1,862
Total other comprehensive income (loss), net of tax	(3,000)	(2,941)	(10,737)	7,834
Accumulated other comprehensive income (loss), ending balance	$ (18,128)	$ (3,403)	$ (18,128)	$ (3,403)