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Consolidated Statements of Financial Condition (Current Period Unaudited) (Parentheticals) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Securities held-to-maturity, fair value $ 30,593 $ 35,408
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) 28,803,937 28,632,904
Treasury stock, at average cost (in shares) 2,726,658 2,897,691
Collateralized Mortgage Backed Securities [Member]    
Securities available for sale, fair value option $ 1,801 $ 2,016
Securities held-to-maturity, fair value 7,816
Securities available for sale, pledged as collateral 89,197 145,860
Securities available for sale, fair value option 1,801 2,016
Other Debt Obligations [Member]    
Securities available for sale, fair value option 28,706 28,429
Securities held-to-maturity, fair value 22,777 35,408
Securities available for sale, pledged as collateral 143,261 82,064
Securities available for sale, fair value option $ 28,706 $ 28,429