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Loans And Allowance (Details)
 12 Months Ended
Dec. 31, 2017
USD ($)
contract
borrower
loan
Dec. 31, 2016
USD ($)
contract
loan
Dec. 31, 2015
USD ($)
Schedule of Available-for-sale Securities [Line Items]      
Amount of loans on which the accrual of interest has been discontinued, totaled $ 3,300,000 $ 3,800,000  
Related party loans 403,000 444,000 $ 787,000
Amount of interest that would have been accrued from non performing financial receivable, totaled 200,000   $ 200,000
Amount of loans past due 90 days or more and still accruing interest, totaled 60,255 36,266  
Loans, net of deferred fees and costs 271,612,000 265,058,000  
Amount of recorded investment in new troubled debt restructurings, totaled $ 263,000 $ 312,000  
Number of new loans modified as TDRs | loan 0 0  
Number of TDRs accounts | contract 2 3  
Non-performing TDRs      
Schedule of Available-for-sale Securities [Line Items]      
Loans, net of deferred fees and costs $ 46,162,000 $ 83,945,000  
Amount of recorded investment in new troubled debt restructurings, totaled 216,500,000 228,500,000  
Residential Real estate      
Schedule of Available-for-sale Securities [Line Items]      
Amount of residential real estate loan and receivable, outstanding 1,293,620    
Amount of residential real estate loan and receivable, specific reserves $ 513,420    
Number of loan residential real estate | contract 1    
Number of residential real estate loans borrowers | borrower 1    
Loans, net of deferred fees and costs $ 81,926,000 93,468,000  
Consumer      
Schedule of Available-for-sale Securities [Line Items]      
Amount of consumer and indirect loans, outstanding 160,004    
Amount of consumer and indirect loans, specific reserves $ 52,040    
Number of loan consumer and indirect loans | contract 3    
Number of borrowers | borrower 3    
Loans, net of deferred fees and costs $ 16,112,000 14,739,000  
Amount of recorded investment in new troubled debt restructurings, totaled $ 46,000 $ 84,000  
Number of TDRs accounts | contract 1 2  
Installment | Collateralized Auto Loans      
Schedule of Available-for-sale Securities [Line Items]      
Loans, net of deferred fees and costs $ 85,200,000 $ 71,700,000  
Performing      
Schedule of Available-for-sale Securities [Line Items]      
Number of TDRs accounts | contract 1 2