Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated other comprehensive income, beginning balance	$ (1,553)	$ (10,499)	$ (1,895)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	983	(6,843)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(8,239)	15,789
Net other comprehensive income (loss)	(7,256)	8,946	(8,604)
Accumulated other comprehensive income, ending balance	(8,809)	(1,553)	(10,499)
Net Unrealized Gains on AFS Securities [Member]
Accumulated other comprehensive income, beginning balance	3,089	9,709	13,143
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1,021	(6,808)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	188
Net other comprehensive income (loss)	1,021	(6,620)	(3,434)
Accumulated other comprehensive income, ending balance	4,110	3,089	9,709
Accumulated Other-than-Temporary Impairment [Member]
Accumulated other comprehensive income, beginning balance	112	(1,937)	(2,062)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	2,049
Net other comprehensive income (loss)	0	2,049	125
Accumulated other comprehensive income, ending balance	112	112	(1,937)
Net Unrealized Losses on Cash Flow Hedges [Member]
Accumulated other comprehensive income, beginning balance	(618)	(1,006)	(1,127)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(38)	(35)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	369	423
Net other comprehensive income (loss)	331	388	121
Accumulated other comprehensive income, ending balance	(287)	(618)	(1,006)
Pension Benefit Adjustment [Member]
Accumulated other comprehensive income, beginning balance	(4,136)	(17,265)	(11,849)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(8,608)	13,129
Net other comprehensive income (loss)	(8,608)	13,129	(5,416)
Accumulated other comprehensive income, ending balance	$ (12,744)	$ (4,136)	$ (17,265)