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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities [Abstract] |  |
Investment securities, fair value | $ 314,402 | $ 367,298
Real estate and other repossessed assets, allowance | $ 11,013 | $ 13,665
Shareholders' equity: [Abstract] |  |
Common stock, par value (in dollars per share) | $ 0.00006 | $ 0.00006
Common stock, shares authorized (in shares) | 2,500,000,000 | 2,500,000,000
Common stock, shares issued (in shares) | 75,758,597 | 75,711,492
Common stock, shares outstanding (in shares) | 75,758,597 | 75,711,492
Treasury stock, shares at cost (in shares) | 5,178,999 | 3,588,560

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