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Consolidated Statements of Financial Condition (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities held-to-maturity, fair value	$ 29,874	$ 29,699
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)	27,983,637	28,588,266
Treasury stock, at average cost (in shares)	3,546,958	2,942,329
Collateralized Mortgage Backed Securities [Member]
Securities held-to-maturity, assets pledged	$ 4,796
Securities held-to-maturity, fair value	7,366	7,810
Securities available for sale, pledged as collateral	152,670	148,505
Securities available for sale, fair value option	967	1,590
Other Debt Obligations [Member]
Securities held-to-maturity, assets pledged	0	0
Securities held-to-maturity, fair value	22,508	21,889
Securities available for sale, pledged as collateral	28,871	44,052
Securities available for sale, fair value option	$ 12,843	$ 12,685

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