Shareholders' Equity and Regulatory Matters - Accumulated other comprehensive income (loss) (Details) - USD ($) $ in Thousands |
Jun. 30, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Shareholders' Equity and Regulatory Matters | ||
| Net unrealized gains on securities | $ 73 | $ 466 |
| Net unrecognized losses on defined benefit plan | (32) | (36) |
| Total accumulated other comprehensive income | $ 41 | $ 430 |