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Consolidated Statements of Financial Condition (Current Period Unaudited) (Parentheticals) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Securities held-to-maturity, fair value $ 28,911,000 $ 29,699,000
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 5,000,000 5,000,000
Preferred stock, shares issued (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, shares issued (in shares) 31,530,595 31,530,595
Common stock, shares outstanding (in shares) 28,546,443 28,588,266
Treasury stock, at average cost (in shares) 2,984,152 2,942,329
Collateralized Mortgage Backed Securities [Member]    
Securities held-to-maturity, fair value $ 7,564,000 $ 7,810,000
Securities available for sale, pledged as collateral 245,531 148,505
Securities available for sale, fair value option 1,505 1,590
Other Debt Obligations [Member]    
Securities held-to-maturity, fair value 21,347,000 21,889,000
Securities available for sale, pledged as collateral 41,647 44,052
Securities available for sale, fair value option $ 12,612 $ 12,685