Investment Securities (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Mar. 31, 2012
Beginning Balance	$ 3,171	$ 3,251	$ 3,251	$ 3,249	$ 3,171
Additions for amounts related to credit loss for which an OTTI was not previously recognized	0	0	0	0
Reductions for amounts realized for securities sold/redeemed during the period	0	0	(80)	0
Reductions for amounts related to securities for which the Company intends to sell or that it will be more than likely than not that the Company will be required to sell prior to recovery of amortized cost basis	0	0	0	0
Reductions for increase in cash flows expected to be collected that are recognized over the remaining life of the security	0	0	0	0
Increases to the amount related to the credit loss for which other-than-temporary was previously recognized	0	0	0	2
Ending Balance	$ 3,171	$ 3,251	$ 3,171	$ 3,251	$ 3,171