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Employee Benefits & Stock-Based Compensation Plans (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 17, 2019 | Oct. 16, 2019 | Oct. 15, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Share-Based Compensation [Line Items] |  |  |  |  |
Compensation expense |  |  |  | $ 841 | $ 1,072
Stock Option [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Share based compensation expenses |  |  |  | 462 | 406
Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Share based compensation expenses |  |  |  | 627 | 593
Fair value of shares vested |  |  |  | 631 | 757
Supplemental Executive Retirement Plans |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Liability for retirement benefits |  |  |  | 9,100 | 7,800
Expense recognized for benefits |  |  |  | $ 1,300 | 1,000
401(k) Plan |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Employer matching contribution, percent of match |  |  |  | 100.00% |
Employee contributions |  |  |  | 6.00% |
Percent of Employees' Gross Pay contribution |  |  |  | 75.00% |
Expense recognized |  |  |  | $ 781 | 598
Employee Stock Ownership Plan |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Compensation expense |  |  |  | $ 841 | $ 1,100
ESOP prime rate percentage |  |  |  | 3.25% | 4.75%
ESOP shares |  |  |  | 1,538,868 | 1,538,868
ESOP payable term |  | 15 years |  |  |
Fair value of unallocated shares |  |  |  | $ 14,000 |
Additional amount funded |  | $ 8,200 |  |  |
Purchase by ESOP (in shares) |  | 816,992 |  |  |
Purchase by ESOP (in dollars per share) |  | $ 10.00 |  |  |
Purchase by ESOP, as a percentage of shares sold in the Company's second-step offering |  | 8.00% |  |  |
Average price of unallocated shares | $ 8.01 |  |  |  |
Committed to be allocated |  |  |  | 89,758 | 89,757
2016 Equity Plan [Member] | Stock Option [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Shares reserved |  |  |  | 902,344 |
2016 Equity Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Shares reserved |  |  |  | 360,935 |
2020 Equity Plan [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Shares reserved |  |  |  | 1,021,239 |
2020 Equity Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Shares reserved |  |  |  | 408,495 |
2016 And 2020 Equity Plan [Member] | Stock Option [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Options expiration period |  |  |  | 10 years |
Minimum [Member] | 2016 And 2020 Equity Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Vesting period (years) |  |  |  | 3 years |
Maximum [Member] | 2016 And 2020 Equity Plan [Member] | Restricted Stock [Member] |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
Vesting period (years) |  |  |  | 5 years |
Old Provident [Member] | Employee Stock Ownership Plan |  |  |  |  |
Share-Based Compensation [Line Items] |  |  |  |  |
ESOP shares |  |  | 721,876 |  |
Initial stock offering |  |  | $ 3,600 |  |
ESOP payable term |  |  | 15 years |  |

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