Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accumulated other comprehensive income (loss), beginning balance	$ (8,809)
Net other comprehensive income (loss)	(890)	$ (7,256)	$ 8,946
Accumulated other comprehensive income (loss), ending balance	(9,699)	(8,809)
Net Unrealized Gains on AFS Securities [Member]
Accumulated other comprehensive income (loss), beginning balance	4,222	3,201	9,709
Other comprehensive income (loss) before reclassifications, net of tax	(3,171)	1,021	(6,808)
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	300
Net other comprehensive income (loss)	(3,171)	1,021	(6,508)
Accumulated other comprehensive income (loss), ending balance	1,051	4,222	3,201
Accumulated Other-than-Temporary Impairment [Member]
Accumulated other comprehensive income (loss), beginning balance	0	0	(1,937)
Other comprehensive income (loss) before reclassifications, net of tax	0	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	0	0	1,937
Net other comprehensive income (loss)	0	0	1,937
Accumulated other comprehensive income (loss), ending balance	0	0	0
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income (loss), beginning balance	(287)	(618)	(1,006)
Other comprehensive income (loss) before reclassifications, net of tax	(53)	(38)	(35)
Amounts reclassified from accumulated other comprehensive income, net of tax	297	369	423
Net other comprehensive income (loss)	244	331	388
Accumulated other comprehensive income (loss), ending balance	(43)	(287)	(618)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income (loss), beginning balance	(12,744)	(4,136)	(17,265)
Other comprehensive income (loss) before reclassifications, net of tax	0	0	0
Amounts reclassified from accumulated other comprehensive income, net of tax	2,037	(8,608)	13,129
Net other comprehensive income (loss)	2,037	(8,608)	13,129
Accumulated other comprehensive income (loss), ending balance	(10,707)	(12,744)	(4,136)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated other comprehensive income (loss), beginning balance	(8,809)	(1,553)	(10,499)
Other comprehensive income (loss) before reclassifications, net of tax	(3,224)	983	(6,843)
Amounts reclassified from accumulated other comprehensive income, net of tax	2,334	(8,239)	15,789
Net other comprehensive income (loss)	(890)	(7,256)	8,946
Accumulated other comprehensive income (loss), ending balance	$ (9,699)	$ (8,809)	$ (1,553)