Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Tax on net unrealized holding gain (loss) on available for sale securities arising during the period (in Dollars)	$ 543	$ 3,677	$ (377)
Tax on reclassification adjustment for prior period unrealized gain recognized during current period (in Dollars)	330	84	1,863
Tax on change in unfunded portion of postretirement benefit obligation (in Dollars)	$ (92)	$ (500)	$ 643