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Business Description - Additional Information (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended | 87 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 $ / shares shares | Dec. 31, 2019 USD ($) | Oct. 15, 2018 Acquisition Branch | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |
Total assets |  | $ 2,788,535 |  | $ 2,974,002 |  |
Gross consolidated loans held for investment and held for sale |  | 2,300,000 |  |  |  |
Total deposits |  | 2,248,938 |  | 2,144,041 |  |
Total stockholders' Equity |  | $ 407,690 |  | $ 374,621 | $ 265,176 | $ 181,585
Number of acquisitions | Acquisition |  |  | 5 |  |  |
First American International Bank | Queens |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Number of branches operated | Branch |  |  | 3 |  |  |
First American International Bank | Manhattan |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Number of branches operated | Branch |  |  | 2 |  |  |
First American International Bank | Brooklyn |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Number of branches operated | Branch |  |  | 2 |  |  |
Initial Public Offering |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |
Number of shares issued in offering | shares | 3,750,000 |  |  |  |  |
Share price per share | $ / shares | $ 23.00 |  |  |  |  |

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