Consolidated Statements of Financial Condition (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Securities held-to-maturity, fair value	$ 29,381	$ 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)	28,819,891	28,632,904
Treasury stock, at average cost (in shares)	2,710,704	2,897,691
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, fair value	$ 7,839
Securities available for sale, pledged as collateral	94,414	145,860
Securities available for sale, fair value option	1,696	2,016
Securities available for sale, fair value option	1,696	2,016
Other Debt Obligations [Member]
Securities held-to-maturity, fair value	21,542	35,408
Securities available for sale, pledged as collateral	45,921	82,064
Securities available for sale, fair value option	19,712	28,429
Securities available for sale, fair value option	$ 19,712	$ 28,429