Borrowings (Details 1) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Put Option [Member]
Summary of FHLB put options
FHLB put options maturing in 2015			$ 75,000
FHLB put options maturing in 2015, Interest Rate			3.16% - 3.64%
FHLB put options maturing in 2016			45,000
FHLB put options maturing in 2016, Interest Rate			2.93% - 3.05%
FHLB put options maturing in 2018			20,000
FHLB put options maturing in 2018, Interest Rate			2.73% - 2.85%
FHLB put options maturing in 2021			135,000
FHLB put options maturing in 2021, Interest Rate			2.88% - 3.43%
FHLB Advances, Maturity Amount, Total	$ 997,013	$ 1,069,046	$ 275,000