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Capital Stock - Textual (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 12, 2019 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Mar. 05, 2020 | Dec. 31, 2019 | Oct. 29, 2019 | Oct. 22, 2019 | Jul. 23, 2012 | Feb. 27, 2009
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) |  |  |  |  | 40,040,000 |  | 40,040,000 |  |  |  | 40,040,000
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.01 |  | $ 0.01 |  |  |  | $ 0.01
Preferred stock, shares issued (in shares) |  |  |  |  | 767 |  | 767 |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  | 767 |  | 767 |  |  |  |
Number of shares authorized to be repurchased (in shares) |  |  |  |  |  | 180,000,000 |  |  | 60,000,000 | 1,700,000 |
Stock repurchases (in shares) |  | 4,922,336 | 0 | 0 |  |  |  |  |  |  |
Stock repurchases, average price (in dollars per share) |  | $ 18.96 |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, liquidation preference, value |  |  |  |  |  |  |  |  |  |  | $ 80,000,000
Reliance Bancshares, Inc. | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 40,000 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |
Reliance Bancshares, Inc. | Series B Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 2,000.02 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |
Reliance Bancshares, Inc. | Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |
Preferred stock, dividend rate, percentage | 7.00% |  |  |  |  |  |  |  |  |  |
Reliance Bancshares, Inc. | Series C Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares authorized (in shares) | 140 |  |  |  |  |  |  | 140 |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  | 0 |  |  |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  | 0 |  |  |
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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