Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Accumulated other comprehensive income (loss), beginning balance	$ 929	$ (17,503)	$ (11,237)	$ (28,309)
Other comprehensive income (loss) before reclassifications	(2,032)	5,342	9,584	15,945
Amounts reclassed from accumulated other comprehensive income (loss)	641	295	1,191	498
Total other comprehensive income (loss), net of tax	(1,391)	5,637	10,775	16,443
Accumulated other comprehensive income (loss), ending balance	(462)	(11,866)	(462)	(11,866)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	16,032	(5,741)	3,226	(16,762)
Other comprehensive income (loss) before reclassifications	(1,808)	5,972	10,998	16,993
Amounts reclassed from accumulated other comprehensive income (loss)	0	61	0	61
Total other comprehensive income (loss), net of tax	(1,808)	6,033	10,998	17,054
Accumulated other comprehensive income (loss), ending balance	14,224	292	14,224	292
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(1,843)	(251)	(793)	191
Other comprehensive income (loss) before reclassifications	(224)	(630)	(1,414)	(1,048)
Amounts reclassed from accumulated other comprehensive income (loss)	232	8	372	(16)
Total other comprehensive income (loss), net of tax	8	(622)	(1,042)	(1,064)
Accumulated other comprehensive income (loss), ending balance	(1,835)	(873)	(1,835)	(873)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(13,260)	(11,511)	(13,670)	(11,738)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	409	226	819	453
Total other comprehensive income (loss), net of tax	409	226	819	453
Accumulated other comprehensive income (loss), ending balance	$ (12,851)	$ (11,285)	$ (12,851)	$ (11,285)