Supplemental Comprehensive Income Disclosures (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			$ 1,259	$ 2,001
Unrealized holding (losses) gains on securities arising during the period	(2,752)	1,346	(23,786)	2,065
Amounts reclassified from accumulated other comprehensive income (loss)			3,058	901
Total other comprehensive (loss) income	(2,747)	2,133	(20,728)	2,966
Accumulated Other Comprehensive Income (Loss), Ending Balance	(19,469)	4,967	(19,469)	4,967
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			138	332
Unrealized holding (losses) gains on securities arising during the period			0	0
Amounts reclassified from accumulated other comprehensive income (loss)			0	0
Total other comprehensive (loss) income			0	0
Accumulated Other Comprehensive Income (Loss), Ending Balance	138	332	138	332
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss), Beginning Balance			1,121	1,669
Unrealized holding (losses) gains on securities arising during the period			(23,786)	2,065
Amounts reclassified from accumulated other comprehensive income (loss)			3,058	901
Total other comprehensive (loss) income			(20,728)	2,966
Accumulated Other Comprehensive Income (Loss), Ending Balance	$ (19,607)	$ 4,635	$ (19,607)	$ 4,635