Shareholder's Equity (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of accumulated other comprehensive income (loss) balances, net of tax
Unrealized gains on securities available for sale, Beginning Balance	$ 3,447
Unrealized gains on post-retirement benefits, Beginning Balance	1,585
Total, Beginning Balance	5,032
Unrealized gains on securities available for sale, Current Period Change	1,635	9,120	(9,558)
Unrealized gains on post-retirement benefits, Current Period Change	15	690	670
Total, Current Period Change	1,650	9,810	(8,888)
Unrealized gains on securities available for sale, Ending Balance	5,082	3,447
Unrealized gains on post-retirement benefits, Ending Balance	1,600	1,585
Total, Ending Balance	$ 6,682	$ 5,032