Consolidated Statements of Changes in Stockholders’ Equity (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Issuance upon exercise of stock options, common shares (in Shares)	138,025
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.39	$ 0.39
Common Stock [Member]
Issuance upon exercise of stock options, common shares (in Shares)		155,061
Shares issued upon vesting of restricted stock unit awards, common shares (in Shares)		119,600
Additional Paid-in Capital [Member]
Issuance upon exercise of stock options, common shares (in Shares)	154,543	155,061
Shares issued upon vesting of restricted stock unit awards, common shares (in Shares)	113,272	119,800
Award of common shares released from Employee Benefit Trust, common shares (in Shares)	154,543	140,298
Treasury Stock [Member] | Outstanding Common Shares Repurchased [Member]
Repurchase of outstanding shares, common shares (in Shares)	181,000	362,050
Treasury Stock [Member] | Shares Repurchased To Fund Options Exercised [Member]
Repurchase of outstanding shares, common shares (in Shares)	60,571	3,794
Treasury Stock [Member] | Shares Repurchased To Satisfy Tax Obligations [Member]
Repurchase of outstanding shares, common shares (in Shares)	38,723	27,441
Treasury Stock [Member]
Issuance upon exercise of stock options, common shares (in Shares)	138,025	23,129
Shares issued upon vesting of restricted stock unit awards, common shares (in Shares)	142,222	200
Retained Earnings [Member]
Issuance upon exercise of stock options, common shares (in Shares)	10,480	23,129
Shares issued upon vesting of restricted stock unit awards, common shares (in Shares)	28,950
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.39	$ 0.39
Accumulated Other Comprehensive Income (Loss) [Member]
Change in net unrealized gains (losses) on securities available for sale, tax effect (in Dollars)	$ (6,401)	$ (8,707)
Amortization of actuarial losses, tax effect (in Dollars)	(347)	(183)
Amortization of prior service credits, tax effect (in Dollars)	15	15
OTTI charges included in income, tax effect (in Dollars)	(339)	(693)
Reclassification adjustment for gains included in net income, tax effect (in Dollars)	$ 42