Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Accumulated other comprehensive income (loss), beginning balance			$ (19,757)	$ (9,699)
Other comprehensive income (loss) before reclassifications			2,620	1,557
Amounts reclassed from accumulated other comprehensive income (loss)			766	497
Total other comprehensive income (loss), net of tax	$ 1,298	$ 71	3,386	2,054
Accumulated other comprehensive income (loss), ending balance	(16,371)	(7,645)	(16,371)	(7,645)
Net Unrealized Gains (Losses) on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance			(6,825)	1,051
Other comprehensive income (loss) before reclassifications			3,323	1,651
Amounts reclassed from accumulated other comprehensive income (loss)			0	0
Total other comprehensive income (loss), net of tax			3,323	1,651
Accumulated other comprehensive income (loss), ending balance	(3,502)	2,702	(3,502)	2,702
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance			(300)	(43)
Other comprehensive income (loss) before reclassifications			(703)	(94)
Amounts reclassed from accumulated other comprehensive income (loss)			339	0
Total other comprehensive income (loss), net of tax			(364)	(94)
Accumulated other comprehensive income (loss), ending balance	(664)	(137)	(664)	(137)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance			(12,632)	(10,707)
Other comprehensive income (loss) before reclassifications			0	0
Amounts reclassed from accumulated other comprehensive income (loss)			427	497
Total other comprehensive income (loss), net of tax			427	497
Accumulated other comprehensive income (loss), ending balance	$ (12,205)	$ (10,210)	$ (12,205)	$ (10,210)