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Employee Benefit Plans (Detail Textuals)
1 Months Ended 12 Months Ended
Aug. 29, 2017
Executiveofficer
shares
Dec. 31, 2017
USD ($)
Executiveofficer
shares
Dec. 31, 2016
USD ($)
Executiveofficer
shares
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Description of defined contribution pension   Employees are eligible for participation in the 401(k) Plan after one year of service and attaining age 21. The 401(k) Plan allows employees to contribute 1% to 100% of their annual salary subject to statutory limitations. Matching contributions made by the Bank are 100% of the first 6% of compensation that an employee contributes to the 401(k) Plan.  
Matching contributions made by the Bank     100.00%
Matching contributions made by employees   $ 225,000 $ 189,000
Discretionary contributions made   85,000 $ 77,000
ESOP borrowed to purchase shares   $ 700,000  
Number of shares purchased | shares   69,972  
Employee stock ownership plan debt structure description   The loan is being repaid in twenty equal annual installments through 2026. The loan bears interest at the prime rate.  
Total shares released to participants | shares   3,808 3,808
Expense related to ESOP [1]   $ 52,000 $ 44,000
Number of unearned ESOP shares   34,271  
Aggregate market value of unearned ESOP shares.   $ 582,607  
2017 Equity Incentive Plan | Restricted stock awards      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of shares authorized for award | shares 77,668    
Award vesting period 5 years    
Award vesting percentage per year 20.00%    
2017 Equity Incentive Plan | Directors | Restricted stock awards      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of restricted stock awards granted | shares 21,380    
Number of external directors | Executiveofficer 11    
2017 Equity Incentive Plan | Executive officers | Restricted stock awards      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of restricted stock awards granted | shares 41,320    
Supplemental executive retirement plan (SERP)      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Number of executive under supplemental executive retirement plan (SERP) | Executiveofficer   2 2
Contribution recorded under supplemental executive retirement plan (SERP)   $ 797,000 $ 759,000
Total expense under the SERP   $ 38,000 $ 138,000
[1] Restated