Consolidated Statements of Comprehensive Income (Unaudited) - AOCI - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			$ (15,855)	$ (26,792)
Other comprehensive income (loss)	$ 5,414	$ (3,581)	37	7,940
Ending Balance	(15,818)	(18,852)	(15,818)	(18,852)
Accumulated Unrealized Loss on Securities Available- for-Sale
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(2,950)	(20,419)
Other comprehensive income (loss)			(481)	8,429
Ending Balance	(3,431)	(11,990)	(3,431)	(11,990)
Accumulated Unrealized Loss on Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(1,138)	0
Other comprehensive income (loss)			518	(489)
Ending Balance	(620)	(489)	(620)	(489)
Unrecognized Net Pension Costs
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance			(11,767)	(6,373)
Other comprehensive income (loss)			0	0
Ending Balance	$ (11,767)	$ (6,373)	$ (11,767)	$ (6,373)