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Corporate Structure (Narrative) (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 16, 2019 USD ($) $ / shares shares | Sep. 30, 2020 item shares | Sep. 30, 2019 | Sep. 30, 2020 item shares | Sep. 30, 2019 | Dec. 31, 2019 shares | Oct. 15, 2019
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Common Stock, Shares, Outstanding | shares |  | 19,472,310 |  | 19,472,310 |  | 19,473,818 |
Exchange ratio |  | 2.0212 | 2.0212 | 2.0212 | 2.0212 |  |
Proceeds used to fund ESOP | $ | $ 8.2 |  |  |  |  |  |
Purchase by ESOP (in shares) | shares | 816,992 |  |  |  |  |  |
Number of banking offices | item |  | 7 |  | 7 |  |  |
Number of loan production offices | item |  | 2 |  | 2 |  |  |
Second-Step Stock Offering [Member] |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Proceeds from sale of common stock, net | $ | $ 102.1 |  |  |  |  |  |
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 | $ | $ 8.2 |  |  |  |  |  |
Purchase by ESOP (in shares) | shares | 816,992 |  |  |  |  |  |
Purchase by ESOP (in dollars per share) | $ / shares | $ 10.00 |  |  |  |  |  |
Share issue, related expenses | $ | $ 2.4 |  |  |  |  |  |
Net proceeds invested in Bank's operations | $ | $ 45.8 |  |  |  |  |  |
Mutual Holding Company MHC [Member] |  |  |  |  |  |  |
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items] |  |  |  |  |  |  |
Percentage of ownership (as a percent) |  |  |  |  |  |  | 52.00%
Common Stock, Shares, Outstanding | shares | 19,484,343 |  |  |  |  |  |
Exchange ratio | 2.0212 |  |  |  |  |  |

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