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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Investment securities: |  |
Estimated fair value | $ 1,632.5 | $ 55.0
Stockholders' equity: |  |
Nonvoting, noncumulative preferred stock, shares authorized (in shares) | 100,000 | 100,000
Nonvoting, noncumulative preferred stock, shares issued (in shares) | 0 | 0
Nonvoting, noncumulative preferred stock, shares outstanding (in shares) | 0 | 0

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