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Capital Stock - Textual (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 20 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Jul. 23, 2021 | Jul. 22, 2021 | Dec. 31, 2020 | Oct. 29, 2019 | Feb. 27, 2009
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 40,040,000 |  | 40,040,000 |  |  |  |  | 40,040,000 |  | 40,040,000
Preferred stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 |  |  |  |  | $ 0.01 |  | $ 0.01
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 276,500,000 | 180,000,000 |  |  |
Stock repurchases (in shares) | 1,806,205 | 0 | 1,937,121 | 4,922,336 | 178,000,000 |  |  |  |  |
Stock repurchases, average price (in dollars per share) | $ 28.48 |  | $ 28.14 | $ 18.96 |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference, value |  |  |  |  |  |  |  |  |  | $ 80,000,000
Reliance Bancshares, Inc. | Series D Preferred Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  | $ 0.01 |

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