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Consolidated Statements of Financial Condition (Parentheticals) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Securities held-to-maturity, fair value | $ 61,658 | $ 62,112
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) | 28,217,434 | 28,157,206
Treasury stock, at average cost (in shares) | 3,313,161 | 3,373,389
Collateralized Mortgage Backed Securities [Member] |  |
Securities held-to-maturity, assets pledged | $ 8,872 | $ 5,283
Securities held-to-maturity, fair value | 9,126 | 8,114
Securities available for sale, pledged as collateral | 178,819 | 212,038
Securities available for sale, fair value option | 703 | 772
Other Debt Obligations [Member] |  |
Securities held-to-maturity, assets pledged | 402 | 0
Securities held-to-maturity, fair value | 52,532 | 53,998
Securities available for sale, pledged as collateral | 0 | 0
Securities available for sale, fair value option | $ 13,707 | $ 13,548

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