Consolidated Statements of Changes in Shareholders' Equity (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Comprehensive income:
Amortization of net actuarial loss and prior service credit on pension and post retirement plans, gross of deferred taxes	$ 31	$ (81)
Unrealized net holding gain (loss) on securities available-for-sale arising during the period, before tax	4,880	275
Reclassification adjustment for net gain realized in net income during the year	$ 677	$ 287
Cash dividend declared (in dollars per share)	$ 0.0656	$ 0.0656
Sale of treasury stock (in shares)	127,395	113,905