Consolidated Statements of Changes in Stockholders’ Equity (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.30	$ 0.26
Additional Paid-in Capital [Member]
Award of common shares released from Employee Benefit Trust, common shares	129,694	137,346
Shares issued upon vesting of restricted stock unit awards, common shares	2,500	120,014
Issuance upon exercise of stock options, common shares	100,625	96,925
Treasury Stock [Member] | Outstanding Common Shares Repurchased [Member]
Repurchase of outstanding shares, common shares	108,120	806,092
Treasury Stock [Member] | Shares Repurchased To Fund Options Exercised [Member]
Repurchase of outstanding shares, common shares	63,732	112,332
Treasury Stock [Member] | Shares Repurchased To Satisfy Tax Obligations [Member]
Repurchase of outstanding shares, common shares	55,465	49,103
Treasury Stock [Member]
Shares issued upon vesting of restricted stock unit awards, common shares	188,480	176,456
Issuance upon exercise of stock options, common shares	100,625	151,355
Retained Earnings [Member]
Shares issued upon vesting of restricted stock unit awards, common shares	185,980	56,242
Issuance upon exercise of stock options, common shares	7,200	54,160
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.30	$ 0.26
Accumulated Other Comprehensive Income (Loss) [Member]
Change in net unrealized gains (losses) on securities available for sale, taxes (in Dollars)	$ (9,141)	$ 14,140
Amortization of actuarial losses, taxes (in Dollars)	(189)	(270)
Amortization of prior service credits, taxes (in Dollars)	13	10
OTTI charges included in income, net of taxes (in Dollars)		(220)
Reclassification adjustment for gains included in net income, tax (in Dollars)		$ 1,257