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Stock-based Compensation (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
item
shares
Jun. 30, 2020
shares
Mar. 31, 2020
shares
Sep. 30, 2019
USD ($)
shares
Jun. 30, 2019
shares
Mar. 31, 2019
shares
Sep. 30, 2020
USD ($)
item
shares
Sep. 30, 2019
USD ($)
shares
Dec. 31, 2006
USD ($)
$ / shares
shares
May 23, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of stock-based compensation plans | item 4           4      
Compensation cost | $ $ 87,000     $ 115,000     $ 239,000 $ 354,000    
Stock options exercised, shares       17,773            
ESOP compensation expense | $             76,000 91,000    
ESOP, shares earned 1,984 1,984 1,984 1,984 1,983 1,984        
2006 Stock Option Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation cost | $ $ 8,000     $ 8,000     $ 25,000 $ 25,000    
Share-based payment award expiration date             Oct. 24, 2016      
Share-based compensation arrangement description             Both incentive stock options and non-qualified stock options have been granted under the Stock Option Plan. The exercise price of each stock option equals the market price of the Company's common stock on the date of grant and an option's maximum term is ten years.      
Stock option award vesting period             5 years      
Stock options outstanding intrinsic value | $ $ 0           $ 0      
Stock options exercised, shares 0     17,773     0 17,773    
Stock awards available for grant, shares 0           0      
Unrecognized compensation cost related to options | $ $ 36,000           $ 36,000      
Unrecognized compensation cost, recognition period             13 months      
2006 Recognition and Retention Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation cost | $ 6,000     $ 14,000     $ 18,000 $ 58,000    
Share-based payment award expiration date             Oct. 24, 2016      
Share-based compensation number of stock shares vested             20 4,915    
Unrecognized compensation cost, recognition period             13 months      
Unrecognized compensation cost related to awards | $ 25,000           $ 25,000      
2012 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation number of stock shares vested               4,213    
Employee Stock Ownership Plan "ESOP" [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award requisite service period             5 years      
Employee stock ownership plan description             The Company established the ESOP for the benefit of eligible employees of the Company and Bank. All Company and Bank employees meeting certain age and service requirements are eligible to participate in the ESOP. Participants' benefits become fully vested after five years of service once the employee is eligible to participate in the ESOP.      
ESOP, loan amount | $ 1,500,000           $ 1,500,000   $ 2,600,000  
ESOP, shares acquired                 238,050  
ESOP, stock purchase price | $ / shares                 $ 10.70  
ESOP, reduction to stockholders' equity from purchased shares | $                 $ 2,600,000  
ESOP, fair value of unallocated shares | $ $ 1,700,000           $ 1,700,000      
ESOP, number of allocated shares 76,242     72,582     76,242 72,582    
ESOP, number of unallocated shares 126,958     134,893     126,958 134,893    
ESOP compensation expense | $ $ 25,000     $ 30,000     $ 76,000 $ 91,000    
ESOP, shares earned 1,984     1,984     5,951 5,951    
Restricted Stock [Member] | 2006 Recognition and Retention Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation number of stock shares vested             115,790      
Restricted Stock [Member] | 2012 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation cost | $ $ 45,000     $ 60,000     $ 112,000 $ 172,000    
Share-based compensation number of stock shares vested             83,572      
Unrecognized compensation cost, recognition period             29 months      
Unrecognized compensation cost related to awards | $ 204,000           $ 204,000      
Stock Option [Member] | 2012 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Compensation cost | $ 3,000     $ 3,000     8,000 $ 8,000    
Stock options outstanding intrinsic value | $ $ 0           $ 0      
Stock awards available for grant, shares 0           0      
Unrecognized compensation cost related to options | $ $ 11,000           $ 11,000      
Unrecognized compensation cost, recognition period             13 months      
Maximum [Member] | 2006 Stock Option Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation number of shares authorized 297,562           297,562      
Share-based payment award expiration period             10 years      
Maximum [Member] | 2006 Recognition and Retention Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation number of shares authorized 119,025           119,025      
Maximum [Member] | Restricted Stock [Member] | 2012 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation number of shares authorized                   180,000
Maximum [Member] | Stock Option [Member] | 2012 Equity Incentive Plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Share-based compensation number of shares authorized                   20,000