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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