Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income, Unrealized Gains and Losses on Available-for-Sale Securities, Beginning Balance	$ 2,071		$ 2,365
Other comprehensive income before reclassification, Unrealized Gains and Losses on Available-for-Sale Securities	(2,713)		(2,951)
Amounts reclassified from accumulated other comprehensive income, Totals, Unrealized Gains and Losses on Available-for-Sale Securities	(65)		(121)
Net current period other comprehensive loss, Totals, Unrealized Gains and Losses on Available-for-Sale Securities	(2,778)	70	(3,072)	(342)
Accumulated Other Comprehensive Income, Unrealized Gains and Losses on Available-for-Sale Securities, Ending Balance	(707)		(707)
Accumulated Other Comprehensive Income, Defined Benefit Pension Items,Beginning Balance	(1,795)		(1,795)
Other comprehensive income before reclassification, Defined Benefit Pension Items	0		0
Amounts reclassified from accumulated other comprehensive income, Defined Benefit Pension Items	0		0
Net current period other comprehensive loss, Defined Benefit Pension Items	0		0
Accumulated Other Comprehensive Income, Defined Benefit Pension Items, Ending Balance	(1,795)		(1,795)
Accumulated Other Comprehensive Income, Totals, Beginning Balance	276		570
Other comprehensive income before reclassification, Totals	(2,713)		(2,951)
Amounts reclassified from accumulated other comprehensive, Defined Benefit Pension Item income	(65)		(121)
Net current period other comprehensive loss, Totals	(2,778)		(3,072)
Accumulated Other Comprehensive Income, Totals, Ending Balance	$ (2,502)		$ (2,502)