Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Company's investments' gross unrealized losses and fair value
Total, Unrealized Losses	$ 9	$ 9
Ginnie Mae collateralized mortgage obligations [Member]
Company's investments' gross unrealized losses and fair value
Less Than 12 Months, Fair Value	2,590
Less Than 12 Months, Unrealized Losses	9
Total, Fair Value	2,590
Total, Unrealized Losses	9
Ginnie Mae and GSE mortgage-backed pass-through securities [Member]
Company's investments' gross unrealized losses and fair value
Less Than 12 Months, Fair Value		4,180
Less Than 12 Months, Unrealized Losses		8
12 Months or Longer, Fair Value		19
12 Months or Longer, Unrealized Losses		1
Total, Fair Value		4,199
Total, Unrealized Losses		$ 9