Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Accumulated other comprehensive income (loss), beginning balance	$ (11,237)	$ (28,309)
Other comprehensive income (loss) before reclassifications	11,734	10,603
Amounts reclassed from accumulated other comprehensive income (loss)	432	203
Total other comprehensive income (loss), net of tax	12,166	10,806
Accumulated other comprehensive income (loss), ending balance	929	(17,503)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	3,226	(16,762)
Other comprehensive income (loss) before reclassifications	12,806	11,021
Amounts reclassed from accumulated other comprehensive income (loss)	0	0
Total other comprehensive income (loss), net of tax	12,806	11,021
Accumulated other comprehensive income (loss), ending balance	16,032	(5,741)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(793)	191
Other comprehensive income (loss) before reclassifications	(1,072)	(418)
Amounts reclassed from accumulated other comprehensive income (loss)	22	(24)
Total other comprehensive income (loss), net of tax	(1,050)	(442)
Accumulated other comprehensive income (loss), ending balance	(1,843)	(251)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(13,670)	(11,738)
Other comprehensive income (loss) before reclassifications	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	410	227
Total other comprehensive income (loss), net of tax	410	227
Accumulated other comprehensive income (loss), ending balance	$ (13,260)	$ (11,511)