Other Comprehensive Income Loss (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Accumulated other comprehensive income (loss) balances, net of tax
Total, ending balance	$ 7,574		$ 7,574
Unrealized gains on post-retirement benefits, beginning balance			1,585
Total, Beginning balance			5,032
Current period change	5,425	7,474	2,542	5,701
Total current period change			2,542
Unrealized gains (losses) on securities available for sale, ending balance	5,989		5,989		3,447
Unrealized gains on post-retirement benefits, ending balance	$ 1,585		$ 1,585