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Summary of Significant Accounting Policies (Details)
$ in Thousands
12 Months Ended
Jan. 24, 2019
shares
Jan. 25, 2018
shares
Dec. 31, 2018
USD ($)
Segment
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 01, 2019
USD ($)
Loans [Abstract]            
Contractually past due period for delinquent loans     90 days      
Other Real Estate Owned [Abstract]            
Other real estate owned     $ 1,092 $ 0    
Key assumptions used in measuring the fair value of mortgage servicing rights [Abstract]            
Constant prepayment rate     8.58% 10.80%    
Discount rate     10.01% 10.02%    
Weighted average life     6 years 9 months 14 days 6 years 7 days    
Advertising Costs [Abstract]            
Advertising costs     $ 373 $ 328 $ 308  
Segment Reporting [Abstract]            
Number of segments | Segment     1      
Subsequent Event [Member]            
Stock Dividend [Abstract]            
Dividends date declared Jan. 24, 2019          
Stock dividend percentage 5.00%          
Dividend date to be paid Mar. 29, 2019          
Dividends payable, date of record Feb. 28, 2019          
Minimum [Member]            
Allowance for Loan Losses [Abstract]            
Past due period after which a loan is charged off     90 days      
Buildings and Improvements [Member] | Minimum [Member]            
Premises and Equipment [Abstract]            
Useful lives used in computing depreciation     15 years      
Buildings and Improvements [Member] | Maximum [Member]            
Premises and Equipment [Abstract]            
Useful lives used in computing depreciation     50 years      
Furniture and Equipment [Member] | Minimum [Member]            
Premises and Equipment [Abstract]            
Useful lives used in computing depreciation     3 years      
Furniture and Equipment [Member] | Maximum [Member]            
Premises and Equipment [Abstract]            
Useful lives used in computing depreciation     10 years      
Consumer Loans [Member]            
Allowance for Loan Losses [Abstract]            
Period of delinquency after which a loan is charged off     90 days      
Dividend Declared In 2018 Annual [Member]            
Stock Dividend [Abstract]            
Dividends date declared     Jan. 25, 2018      
Stock dividend percentage   4.00%        
Stock dividend (in shares) | shares   447,940        
Dividend date to be paid     Mar. 29, 2018      
Dividends payable, date of record     Feb. 28, 2018      
Dividend Declared In 2019 Annual [Member] | Subsequent Event [Member]            
Stock Dividend [Abstract]            
Dividends date declared Jan. 24, 2019          
Stock dividend percentage 5.00%          
Stock dividend (in shares) | shares 583,514          
Dividend date to be paid Mar. 29, 2019          
Dividends payable, date of record Feb. 28, 2019          
ASU 2016-02 [Member] | Subsequent Event [Member]            
Impact of Recently Issued Accounting Standards [Abstract]            
Lease liability           $ 4,800
Right-of-use asset           $ 4,400