Consolidated Statements of Changes in Stockholders’ Equity (Unaudited) (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash dividends declared and paid on common shares, per common share (in Dollars per share)	$ 0.39	$ 0.39
Outstanding Common Shares Repurchased [Member] | Treasury Stock [Member]
Repurchase of outstanding shares, common shares	836,092	181,000
Shares Repurchased To Fund Options Exercised [Member] | Treasury Stock [Member]
Repurchase of outstanding shares, common shares	233,933	60,571
Shares Repurchased To Satisfy Tax Obligations [Member] | Treasury Stock [Member]
Repurchase of outstanding shares, common shares	57,411	38,723
Additional Paid-in Capital [Member]
Award of common shares released from Employee Benefit Trust, common shares	141,059	154,543
Shares issued upon vesting of restricted stock unit awards, common shares	120,014	113,272
Issuance upon exercise of stock options, common shares	235,025	154,543
Treasury Stock [Member]
Shares issued upon vesting of restricted stock unit awards, common shares	176,656	142,222
Issuance upon exercise of stock options, common shares	300,195	138,025
Retained Earnings [Member]
Shares issued upon vesting of restricted stock unit awards, common shares	56,642	28,950
Issuance upon exercise of stock options, common shares	65,170	10,480
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, taxes (in Dollars)	$ 15,482	$ (6,401)
Amortization of actuarial losses, taxes (in Dollars)	(405)	(347)
Amortization of prior service credits, taxes (in Dollars)	15	10
OTTI charges included in income, taxes (in Dollars)	(620)	(339)
Reclassification adjustment for gains included in net income, tax (in Dollars)	$ 1,299	$ 42