Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated other comprehensive income (loss), beginning balance			$ (7,391)
Total other comprehensive income (loss), net of tax	$ 4,878	$ (1,391)	(7,737)	$ 10,775
Accumulated other comprehensive income (loss), ending balance	(15,128)		(15,128)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	(3,438)	16,032	9,881	3,226
Other comprehensive income (loss) before reclassifications	4,134	(1,808)	(9,185)	10,998
Amounts reclassed from accumulated other comprehensive income (loss)	0	0	0	0
Total other comprehensive income (loss), net of tax	4,134	(1,808)	(9,185)	10,998
Accumulated other comprehensive income (loss), ending balance	696	14,224	696	14,224
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(1,150)	(1,843)	(1,447)	(793)
Other comprehensive income (loss) before reclassifications	120	(224)	203	(1,414)
Amounts reclassed from accumulated other comprehensive income (loss)	(50)	232	164	372
Total other comprehensive income (loss), net of tax	70	8	367	(1,042)
Accumulated other comprehensive income (loss), ending balance	(1,080)	(1,835)	(1,080)	(1,835)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(15,418)	(13,260)	(15,825)	(13,670)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	674	409	1,081	819
Total other comprehensive income (loss), net of tax	674	409	1,081	819
Accumulated other comprehensive income (loss), ending balance	(14,744)	(12,851)	(14,744)	(12,851)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(20,006)	929	(7,391)	(11,237)
Other comprehensive income (loss) before reclassifications	4,254	(2,032)	(8,982)	9,584
Amounts reclassed from accumulated other comprehensive income (loss)	624	641	1,245	1,191
Total other comprehensive income (loss), net of tax	4,878	(1,391)	(7,737)	10,775
Accumulated other comprehensive income (loss), ending balance	$ (15,128)	$ (462)	$ (15,128)	$ (462)