Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning of period	$ (2,687)	$ (9,452)	$ (4,509)	$ (13,803)
Other comprehensive income (loss)- before reclassifications	(3,289)	6,912	(1,302)	11,339
Amount reclassified from accumulated other comprehensive income (loss)	49	(71)	(116)	(147)
Other comprehensive income (loss), net of tax	(3,240)	6,841	(1,418)	11,192
Accumulated other comprehensive income (loss), net of tax, end of period	(5,927)	(2,611)	(5,927)	(2,611)
Net unrealized holding (loss) gain on securities available for sale, net of tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning of period	(1,855)	(13,655)	(3,693)	(18,078)
Other comprehensive income (loss)- before reclassifications	(3,289)	6,912	(1,302)	11,339
Amount reclassified from accumulated other comprehensive income (loss)	0	0	(149)	(4)
Other comprehensive income (loss), net of tax	(3,289)	6,912	(1,451)	11,335
Accumulated other comprehensive income (loss), net of tax, end of period	(5,144)	(6,743)	(5,144)	(6,743)
Net change in net actuarial loss and prior service credit on pension and postretirement benefit plans, net of tax [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning of period	(832)	4,203	(816)	4,275
Other comprehensive income (loss)- before reclassifications	0	0	0	0
Amount reclassified from accumulated other comprehensive income (loss)	49	(71)	33	(143)
Other comprehensive income (loss), net of tax	49	(71)	33	(143)
Accumulated other comprehensive income (loss), net of tax, end of period	$ (783)	$ 4,132	$ (783)	$ 4,132