Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning of period	$ (9,452)	$ (169)	$ (13,803)	$ 1,558
Other comprehensive income (loss)- before reclassifications	6,912	(15,824)	11,339	(17,591)
Amount reclassified from accumulated other comprehensive income	(71)	(838)	(147)	(798)
Other comprehensive income (loss), net of tax	6,841	(16,662)	11,192	(18,389)
Accumulated other comprehensive income (loss), net of tax, end of period	(2,611)	(16,831)	(2,611)	(16,831)
Unrealized Gain (Losses) on Securities Available For Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income (loss), net of tax, beginning of period	(13,655)	1,987	(18,078)	3,755
Other comprehensive income (loss)- before reclassifications	6,912	(15,824)	11,339	(17,591)
Amount reclassified from accumulated other comprehensive income	0	(859)	(4)	(860)
Other comprehensive income (loss), net of tax	6,912	(16,683)	11,335	(18,451)
Accumulated other comprehensive income (loss), net of tax, end of period	(6,743)	(14,696)	(6,743)	(14,696)
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	4,203	(2,156)	4,275	(2,197)
Other comprehensive income (loss)- before reclassifications	0	0	0	0
Amount reclassified from accumulated other comprehensive income	(71)	21	(143)	62
Other comprehensive income (loss), net of tax	(71)	21	(143)	62
Accumulated other comprehensive income (loss), net of tax, end of period	$ 4,132	$ (2,135)	$ 4,132	$ (2,135)