Consolidated Statements Of Comprehensive Income (Loss) - AOCI (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (Loss) Income, Beginning Balance	$ (26,792)	$ (15,660)	$ (13,276)
Other comprehensive income (loss)	10,937	(11,132)	(2,384)
Accumulated other comprehensive (Loss) Income, Ending Balance	(15,855)	(26,792)	(15,660)
Accumulated Unrealized (Loss) Gain on Securities Available- for-Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (Loss) Income, Beginning Balance	(20,419)	1,115	(354)
Other comprehensive income (loss)	17,469	(21,534)	1,469
Accumulated other comprehensive (Loss) Income, Ending Balance	(2,950)	(20,419)	1,115
Accumulated Unrealized Loss on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (Loss) Income, Beginning Balance	0	0	0
Other comprehensive income (loss)	(1,138)	0	0
Accumulated other comprehensive (Loss) Income, Ending Balance	(1,138)	0	0
Unrecognized Net Pension Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated other comprehensive (Loss) Income, Beginning Balance	(6,373)	(16,775)	(12,922)
Other comprehensive income (loss)	(5,394)	10,402	(3,853)
Accumulated other comprehensive (Loss) Income, Ending Balance	$ (11,767)	$ (6,373)	$ (16,775)