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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Thousands, $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Statement Of Financial Position [Abstract] |  |
Accounts and accrued income receivable, allowances | $ 13,355 | $ 13,994
Debt securities, amortized cost | 9,000,753 | 6,121,004
Debt securities, allowance for credit losses | 101 | 132
Pledged securities included in debt securities | $ 95,955 | $ 93,586
Preferred stock, par value | $ 0.00001 | $ 0.00001
Preferred stock, shares authorized | 500 | 500
Preferred stock, outstanding | 0 | 0
Common stock, par value | $ 0.00001 | $ 0.00001
Common stock, shares authorized | 300,000 | 300,000
Common stock, shares outstanding | 109,822 | 110,353

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