Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Accumulated other comprehensive income (loss), beginning balance	$ (9,699)
Net other comprehensive income (loss)	(10,058)	$ (890)	$ (7,256)
Accumulated other comprehensive income (loss), ending balance	(19,757)	(9,699)
Net Unrealized Gains on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	1,051	4,222	3,201
Other comprehensive income (loss) before reclassifications, net of tax	(7,876)	(3,171)	1,021
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	0
Net other comprehensive income (loss)	(7,876)	(3,171)	1,021
Accumulated other comprehensive income (loss), ending balance	(6,825)	1,051	4,222
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(43)	(287)	(618)
Other comprehensive income (loss) before reclassifications, net of tax	(257)	(53)	(38)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	297	369
Net other comprehensive income (loss)	(257)	244	331
Accumulated other comprehensive income (loss), ending balance	(300)	(43)	(287)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(10,707)	(12,744)	(4,136)
Other comprehensive income (loss) before reclassifications, net of tax	(2,588)	1,102	(8,933)
Amounts reclassified from accumulated other comprehensive income, net of tax	663	935	325
Net other comprehensive income (loss)	(1,925)	2,037	(8,608)
Accumulated other comprehensive income (loss), ending balance	(12,632)	(10,707)	(12,744)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(9,699)	(8,809)	(1,553)
Other comprehensive income (loss) before reclassifications, net of tax	(10,721)	(2,122)	(7,950)
Amounts reclassified from accumulated other comprehensive income, net of tax	663	1,232	694
Net other comprehensive income (loss)	(10,058)	(890)	(7,256)
Accumulated other comprehensive income (loss), ending balance	$ (19,757)	$ (9,699)	$ (8,809)