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Nature of Operations (Narrative) (Details) $ / shares in Units, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Oct. 16, 2019 USD ($) $ / shares shares | Dec. 31, 2020 item shares | Dec. 31, 2019 USD ($) shares
Nature Of Operations [Line Items] |  |  |
Gross proceeds |  |  | $ 91,578
Common stock, shares sold (in shares) | shares | 19,484,343 | 19,047,544 | 19,473,818
Exchange ratio | 2.0212 |  |
Common stock, shares outstanding | shares | 19,484,343 | 19,047,544 | 19,473,818
Number of banking offices | item |  | 7 |
Second-Step Stock Offering [Member] |  |  |
Nature Of Operations [Line Items] |  |  |
Gross proceeds | $ 102,100 |  |
Common stock, shares sold (in shares) | shares | 10,212,397 |  |
Common stock, share issue price per share (in dollars per share) | $ / shares | $ 10.00 |  |
Proceeds used to fund ESOP | $ 8,200 |  |
Purchase by ESOP (in shares) | shares | 816,992 |  |
Purchase by ESOP (in dollars per share) | $ / shares | $ 10.00 |  |
Share issue, related expenses | $ 2,400 |  |
Net proceeds invested in Bank's operations | $ 45,800 |  |
Exchange ratio | 2.0212 |  |
Mutual Holding Company MHC [Member] |  |  |
Nature Of Operations [Line Items] |  |  |
Percentage of ownership (as a percent) | 52.00% |  |

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