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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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