Accumulated Other Comprehensive (Loss) Income (Details) - 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) [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning of period	$ (5,927)	$ (2,611)	$ (4,509)	$ (13,803)
Other comprehensive income (loss)- before reclassifications	4,713	(770)	3,411	10,569
Amount reclassified from accumulated other comprehensive income (loss)	40	(127)	(76)	(274)
Other comprehensive income (loss), net of tax	4,753	(897)	3,335	10,295
Accumulated other comprehensive income (loss), net of tax, end of period	(1,174)	(3,508)	(1,174)	(3,508)
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	(5,144)	(6,743)	(3,693)	(18,078)
Other comprehensive income (loss)- before reclassifications	4,713	(770)	3,411	10,569
Amount reclassified from accumulated other comprehensive income (loss)	0	(225)	(149)	(229)
Other comprehensive income (loss), net of tax	4,713	(995)	3,262	10,340
Accumulated other comprehensive income (loss), net of tax, end of period	(431)	(7,738)	(431)	(7,738)
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	(783)	4,132	(816)	4,275
Other comprehensive income (loss)- before reclassifications	0	0	0	0
Amount reclassified from accumulated other comprehensive income (loss)	40	98	73	(45)
Other comprehensive income (loss), net of tax	40	98	73	(45)
Accumulated other comprehensive income (loss), net of tax, end of period	$ (743)	$ 4,230	$ (743)	$ 4,230