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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Statement Of Financial Position [Abstract] |  |
Amortized cost of securities available for sale | $ 914,649 | $ 749,458
Loans receivable, allowance for credit losses | 76,613 | 90,426
Face amount of subordinated debentures | 224,100 | 126,800
Unamortized discount and debt issuance costs | $ 9,256 | $ 7,828
Preferred stock par value (in USD per share) | $ 0.001 | $ 0.001
Preferred stock authorized (shares) | 10,000,000 | 10,000,000
Preferred stock issued (shares) | 0 | 0
Common stock par value (in USD per share) | $ 0.001 | $ 0.001
Common stock authorized (shares) | 62,500,000 | 62,500,000
Common stock issued (shares) | 33,617,126 | 33,560,801
Common stock outstanding (shares) | 30,441,601 | 30,717,835
Accumulated other comprehensive (loss) income, tax (benefit) expense | $ (2,296) | $ 1,247
Treasury stock (shares) | 3,175,525 | 2,842,966

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