Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income [Roll Forward]
AOCI - beginning balance	$ (5,499)	$ (3,602)
Other comprehensive income before reclassifications	(2,349)	(419)
Amounts reclassified from accumulated other comprehensive income	1,438	(1,478)
Other Comprehensive Income, net of tax	(911)	(1,897)	6,555
AOCI - ending balance	(6,410)	(5,499)	(3,602)
Unrealized Gains (Losses) on Securities Available for Sale
Accumulated Other Comprehensive Income [Roll Forward]
AOCI - beginning balance	17,904	18,244
Other comprehensive income before reclassifications	(16,021)	1,214
Amounts reclassified from accumulated other comprehensive income	(317)	(1,554)
Other Comprehensive Income, net of tax	(16,338)	(340)
AOCI - ending balance	1,566	17,904
Unrealized Gains (Losses) on Securities Available for Sale for which a Portion of Other-Than-Temporary Impairment has been Recognized in Income
Accumulated Other Comprehensive Income [Roll Forward]
AOCI - beginning balance	(3,272)	(3,168)
Other comprehensive income before reclassifications	1,425	(104)
Amounts reclassified from accumulated other comprehensive income
Other Comprehensive Income, net of tax	1,425	(104)
AOCI - ending balance	(1,847)	(3,272)
Unrealized Gains (Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
AOCI - beginning balance	(2,652)	(1,841)
Other comprehensive income before reclassifications	1,543	(952)
Amounts reclassified from accumulated other comprehensive income	608	141
Other Comprehensive Income, net of tax	2,151	(811)
AOCI - ending balance	(501)	(2,652)
Unrealized Gains (Losses) on Defined Benefit Plans
Accumulated Other Comprehensive Income [Roll Forward]
AOCI - beginning balance	(17,479)	(16,837)
Other comprehensive income before reclassifications	10,704	(577)
Amounts reclassified from accumulated other comprehensive income	1,147	(65)
Other Comprehensive Income, net of tax	11,851	(642)
AOCI - ending balance	$ (5,628)	$ (17,479)