Consolidated Statements of Changes in Stockholders’ Equity (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.13	$ 0.13
Outstanding Common Shares Repurchased [Member] | Treasury Stock [Member]
Repurchase of outstanding shares, common shares	97,200
Shares Repurchased To Fund Options Exercised [Member] | Treasury Stock [Member]
Repurchase of outstanding shares, common shares	40,866
Shares Repurchased To Satisfy Tax Obligations [Member] | Treasury Stock [Member]
Repurchase of outstanding shares, common shares	27,883	14,378
Common Stock [Member]
Issuance upon exercise of stock options, common shares		26,907
Shares issued upon vesting of restricted stock unit awards, common shares		67,886
Additional Paid-in Capital [Member]
Issuance upon exercise of stock options, common shares	56,850	41,825
Shares issued upon vesting of restricted stock unit awards, common shares	85,163	67,886
Award of common shares released from Employee Benefit Trust, common shares	146,735	131,799
Treasury Stock [Member]
Issuance upon exercise of stock options, common shares	67,330	14,378
Shares issued upon vesting of restricted stock unit awards, common shares	113,993
Retained Earnings [Member]
Issuance upon exercise of stock options, common shares	10,480	41,825
Shares issued upon vesting of restricted stock unit awards, common shares	28,830
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.13	$ 0.13
Accumulated Other Comprehensive Income (Loss) [Member]
Change in net unrealized gains (losses) on securities available for sale, tax effect (in Dollars)	$ (962)	$ 2,756
Amortization of actuarial losses, tax effect (in Dollars)	(117)	(61)
Amortization of prior service credits, tax effect (in Dollars)	5	5
OTTI charges included in income, tax effect (in Dollars)		$ (408)