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CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Statement of Financial Position [Abstract] |  |
Available-for-sale securities, at amortized cost | $ 1,140,086 | $ 1,363,902
Held-to-maturity securities, at fair value | 142,583 | 139,377
Equity securities, at amortized cost | $ 1,000 | $ 1,000
Common stock, par value (in dollars per share) | $ 0.1 | $ 0.1
Common stock, authorized (in shares) | 25,000,000 | 25,000,000
Common stock, issued (in shares) | 15,011,660 | 15,348,287
Treasury stock, shares (in shares) | 121,880 | 122,227

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