Consolidated Statements of Changes in Stockholders’ Equity (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.15	$ 0.13
Additional Paid-in Capital [Member]
Award of common shares released from Employee Benefit Trust, common shares	126,650	133,656
Shares issued upon vesting of restricted stock unit awards, common shares	1,000	98,610
Issuance upon exercise of stock options, common shares	50,215	42,400
Treasury Stock [Member] | Outstanding Common Shares Repurchased [Member]
Repurchase of outstanding shares, common shares	28,120	18,560
Treasury Stock [Member] | Shares Repurchased To Fund Options Exercised [Member]
Repurchase of outstanding shares, common shares	23,003	39,957
Treasury Stock [Member] | Shares Repurchased To Satisfy Tax Obligations [Member]
Repurchase of outstanding shares, common shares	53,504	42,666
Treasury Stock [Member]
Shares issued upon vesting of restricted stock unit awards, common shares	183,864	151,652
Issuance upon exercise of stock options, common shares	50,215	52,320
Retained Earnings [Member]
Shares issued upon vesting of restricted stock unit awards, common shares	182,864	53,042
Issuance upon exercise of stock options, common shares	7,140	9,920
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.15	$ 0.13
Accumulated Other Comprehensive Income (Loss) [Member]
Change in net unrealized gains (losses) on securities available for sale, taxes (in Dollars)	$ (4,237)	$ 2,013
Amortization of actuarial losses, taxes (in Dollars)	(112)	(135)
Amortization of prior service credits, taxes (in Dollars)	8	5
Reclassification adjustment for gains included in net income, tax (in Dollars)	$ 0	$ 1,249