Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Securities available for sale and transferred securities: Before Tax Amount
Change in net unrealized gain/loss during the period, Before Tax Amount	$ (6,309)	$ 2,360	$ 7,404
Reclassification adjustment for net (gains) losses included in net income, Before Tax Amount	(97)	(2,139)	(218)
Change in postretirement benefit obligation, Before Tax Amount	333	199
Total other comprehensive income (loss), Before Tax Amount	(5,736)	425
Securities available for sale and transferred securities: Tax Expense (Benefit)
Change in net unrealized gain/loss during the period, Tax Expense (Benefit)	(2,216)	846
Reclassification adjustment for net (gains) losses included in net income, Tax Expense (Benefit)	92	(767)
Change in postretirement benefit obligation, Tax Expense (Benefit)	117	69	(179)
Total other comprehensive income (loss), Tax Expense (Benefit)	(2,007)	148
Securities available for sale and transferred securities: Net of Tax Amount
Change in net unrealized gain/loss during the period, Net of Tax Amount	(4,093)	1,514
Reclassification adjustment for net (gains) losses included in net income, Net of Tax Amount	148	(1,367)
Change in postretirement benefit obligation,Net of Tax Amount	216	130
Total other comprehensive income (loss), Net of Tax Amount	$ (3,729)	$ 277	$ 4,339