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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Statement Of Financial Position [Abstract] |  |
Amortized cost of securities available for sale | $ 655,500 | $ 629,725
Loans receivable, allowance for credit losses | 86,330 | 61,408
Face amount of subordinated debentures | 126,800 | 126,800
Unamortized discount and debt issuance costs | $ 8,130 | $ 8,423
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) | 33,495,913 | 33,475,402
Common stock outstanding (shares) | 30,657,629 | 30,799,624
Accumulated other comprehensive income (loss), tax benefit (expense) | $ 136 | $ 1,370
Treasury stock (shares) | 2,838,284 | 2,675,778

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