Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accumulated other comprehensive income (loss), beginning balance	$ (17,503)	$ (32,675)	$ (28,309)	$ (23,510)
Other comprehensive income (loss) before reclassifications	5,342	(2,764)	15,945	(12,466)
Amounts reclassed from accumulated other comprehensive income (loss)	295	377	498	914
Total other comprehensive income (loss), net of tax	5,637	(2,387)	16,443	(11,552)
Accumulated other comprehensive income (loss), ending balance	(11,866)	(35,062)	(11,866)	(35,062)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	(5,741)	(17,948)	(16,762)	(7,534)
Other comprehensive income (loss) before reclassifications	5,972	(3,112)	16,993	(13,526)
Amounts reclassed from accumulated other comprehensive income (loss)	61	0	61	0
Total other comprehensive income (loss), net of tax	6,033	(3,112)	17,054	(13,526)
Accumulated other comprehensive income (loss), ending balance	292	(21,060)	292	(21,060)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(251)	461	191	(428)
Other comprehensive income (loss) before reclassifications	(630)	348	(1,048)	1,060
Amounts reclassed from accumulated other comprehensive income (loss)	8	17	(16)	194
Total other comprehensive income (loss), net of tax	(622)	365	(1,064)	1,254
Accumulated other comprehensive income (loss), ending balance	(873)	826	(873)	826
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(11,511)	(15,188)	(11,738)	(15,548)
Other comprehensive income (loss) before reclassifications	0	0	0	0
Amounts reclassed from accumulated other comprehensive income (loss)	226	360	453	720
Total other comprehensive income (loss), net of tax	226	360	453	720
Accumulated other comprehensive income (loss), ending balance	$ (11,285)	$ (14,828)	$ (11,285)	$ (14,828)