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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parentheticals) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Shares issued upon vesting of restricted stock unit awards 144,778 191,236
Issuance upon exercise of stock options 45,125  
Cash dividends declared and paid on common shares (in Dollars per share) $ 0.48 $ 0.45
Reclassification adjustment for loss included in net income, tax (in Dollars) $ 73 $ 2,238
Additional Paid-in Capital [Member]    
Award of common shares released from Employee Benefit Trust 143,809 133,446
Shares issued upon vesting of restricted stock unit awards 59,532 7,300
Issuance upon exercise of stock options 21,025 105,925
Treasury Stock [Member]    
Shares issued upon vesting of restricted stock unit awards 204,310 198,536
Issuance upon exercise of stock options 45,125 105,925
Treasury Stock [Member] | Purchase of Common Shares Outstanding [Member]    
Purchases of shares 735,599 661,470
Treasury Stock [Member] | Shares Purchased To Fund Options Exercised [Member]    
Purchases of shares 21,812 63,732
Treasury Stock [Member] | Restricted Stock Awards Repurchased To Satisfy Tax Obligations [Member]    
Purchases of shares 65,637 55,649
Retained Earnings [Member]    
Issuance upon exercise of stock options 24,100 8,000
Cash dividends declared and paid on common shares (in Dollars per share) $ 0.48 $ 0.45
AOCI Attributable to Parent [Member]    
Change in net unrealized gains on securities available for sale, taxes (in Dollars) $ (2,230) $ (7,484)
Amortization of actuarial losses, taxes (in Dollars) (402) (266)
Amortization of prior service credits, taxes (in Dollars) $ 15 $ 18