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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Shares issued upon vesting of restricted stock unit awards 144,578 185,980
Issuance upon exercise of stock options 9,725  
Cash dividends declared and paid on common shares (in Dollars per share) $ 0.32 $ 0.30
Reclassification adjustment for loss included in net income, tax (in Dollars) $ 28  
Additional Paid-in Capital [Member]    
Award of common shares released from Employee Benefit Trust 136,114 129,694
Shares issued upon vesting of restricted stock unit awards 59,532 2,500
Issuance upon exercise of stock options 6,025 100,625
Treasury Stock [Member]    
Shares issued upon vesting of restricted stock unit awards 204,110 188,480
Issuance upon exercise of stock options 9,725 100,625
Treasury Stock [Member] | Purchase of Common Shares Outstanding [Member]    
Purchases of shares 635,199 108,120
Treasury Stock [Member] | Shares Purchased To Fund Options Exercised [Member]    
Purchases of shares 998 63,732
Treasury Stock [Member] | Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member]    
Purchases of shares 58,461 55,465
Retained Earnings [Member]    
Issuance upon exercise of stock options 3,700 7,200
Cash dividends declared and paid on common shares (in Dollars per share) $ 0.32 $ 0.30
AOCI Attributable to Parent [Member]    
Change in net unrealized gains on securities available for sale, taxes (in Dollars) $ 833 $ (9,141)
Amortization of actuarial losses, taxes (in Dollars) 268 189
Amortization of prior service credits, taxes (in Dollars) $ 10 $ 13