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Loans and ALLL (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
loan
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
USD ($)
NumberofLoan
Mar. 31, 2018
NumberofLoan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Threshold period of continuous performance to return loans to accrual status 6 months            
Migration analysis of loan portfolio period 5 years            
Advance in connection with impaired loans $ 621 $ 621 $ 621 $ 621 $ 621   $ 542
Number of loans restructured through the forbearance of principal or accrued interest | NumberofLoan         0 0  
Loans in default   0     0 0  
Minimum [Member] | 4 - Low satisfactory [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Delinquency period 10 days            
Minimum [Member] | 5 - Special mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Delinquency period 30 days            
Maximum [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, amortization term 30 years            
Maximum [Member] | 4 - Low satisfactory [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Delinquency period 30 days            
Maximum [Member] | 5 - Special mention [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Delinquency period 60 days            
Commercial, Agricultural, and Residential Portfolio Segments [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Number of days past due (or more), accrual of interest discontinued 90 days            
Total Consumer [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maximum days of consumer loan charged off 180 days            
Total Consumer [Member] | Maximum [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Financing receivable, amortization term 15 years            
Commercial And Agricultural Portfolio Segment [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maximum percentage of loan       0.80      
Commercial And Agricultural Portfolio Segment [Member] | Customer Concentration Risk [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maximum amount of loans     15,000        
Commercial Advances to Mortgage Brokers Segment [Member] | Customer Concentration Risk [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maximum amount of loans     30,000        
Commercial Advances to Mortgage Brokers Segment [Member] | Customer Concentration Risk [Member] | Minimum [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan advance maturity period 20 days            
Commercial Advances to Mortgage Brokers Segment [Member] | Customer Concentration Risk [Member] | Maximum [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Loan advance maturity period 30 days            
Residential Real Estate [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maximum percentage of loan       1      
Maximum percentage of principal, interest, taxes and hazard insurance on property over gross income       0.28      
Maximum percentage of debt servicing over gross income       0.40      
Maximum amount without corporation approval     $ 1,000        
Residential, Privately Insured, Financing Receivable [Member]              
Accounts, Notes, Loans and Financing Receivable [Line Items]              
Maximum percentage of loan       0.80