FHLB Advances - Advances From FHLB (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Total variable rate advances	$ 5,955
Total fixed rate advances	10,000	10,000
Total FHLB advances	15,955	10,000
Maturities Less Than Thirty Days [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Variable interest rate	0.22%	0.22%
Variable rate advances due within one year	5,955
January 2014 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed interest rate	3.12%	3.12%
Fixed interest rate due within one year	5,000	5,000
May 2014 [Member]
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]
Fixed interest rate	3.06%	3.06%
Fixed interest rate due within one year	$ 5,000	5,000