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Stockholders' Equity Matters - Additional Information (Details) $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 12, 2017 bank shares | Jan. 31, 2018 USD ($) shares | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Percent of dividends paid |  |  | 100.00% | 100.00% | 100.00%
Equity Offering |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Number of banks | bank | 16 |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 14,500,000 |  |  |  |
Over-Allotment Option |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 2,175,000 |  |  |
Sale of stock, consideration received on transaction | $ |  | $ 76,200 |  |  |
Capital gains |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percent of dividends paid |  |  | 49.50% | 14.70% | 5.80%

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