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Loans, Collateral Dependent Loans and Loans With/Without Specific Valuation Allowance (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Loan
Mar. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Loans with a specific valuation allowance [Abstract]      
Specific Allowance   $ 1,631,000 $ 1,212,000
Total loans [Abstract]      
Recorded balance   50,355,000 57,771,000
Unpaid Contractual Principal Balance   54,879,000 61,786,000
Specific Allowance   1,631,000 1,212,000
Average Investment in Impaired Loans   51,120,000 55,700,000
Interest Income Recognized   581,000 2,371,000
Commercial [Member] | Collateral Pledged [Member]      
Loans with a specific valuation allowance [Abstract]      
Specific Allowance $ 2,019,000    
Total loans [Abstract]      
Number of Loans | Loan 31    
Recorded balance $ 54,702,000    
Specific Allowance 2,019,000    
Commercial [Member] | Hotel/Motel [Member] | Collateral Pledged [Member]      
Loans with a specific valuation allowance [Abstract]      
Specific Allowance $ 250,000    
Total loans [Abstract]      
Number of Loans | Loan 3    
Recorded balance $ 14,712,000    
Specific Allowance 250,000    
Commercial [Member] | Commercial Real Estate Residential [Member] | Collateral Pledged [Member]      
Loans with a specific valuation allowance [Abstract]      
Specific Allowance $ 92,000    
Total loans [Abstract]      
Number of Loans | Loan 7    
Recorded balance $ 5,125,000    
Specific Allowance 92,000    
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Collateral Pledged [Member]      
Loans with a specific valuation allowance [Abstract]      
Specific Allowance $ 720,000    
Total loans [Abstract]      
Number of Loans | Loan 16    
Recorded balance $ 25,296,000    
Specific Allowance 720,000    
Commercial [Member] | Commercial Other [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance   8,903,000 7,829,000
Unpaid Contractual Principal Balance   10,598,000 9,489,000
Average Investment in Impaired Loans   8,866,000 9,889,000
Interest Income Recognized   139,000 460,000
Loans with a specific valuation allowance [Abstract]      
Recorded Balance   1,154,000 3,244,000
Unpaid Contractual Principal Balance   1,154,000 3,244,000
Specific Allowance   620,000 886,000
Average Investment in Impaired Loans   1,169,000 1,323,000
Interest Income Recognized   17,000 29,000
Total loans [Abstract]      
Recorded balance   10,057,000 11,073,000
Unpaid Contractual Principal Balance   11,752,000 12,733,000
Specific Allowance   620,000 886,000
Average Investment in Impaired Loans   10,035,000 11,212,000
Interest Income Recognized   156,000 489,000
Commercial [Member] | Commercial Other [Member] | Collateral Pledged [Member]      
Loans with a specific valuation allowance [Abstract]      
Specific Allowance $ 957,000    
Total loans [Abstract]      
Number of Loans | Loan 5    
Recorded balance $ 9,569,000    
Specific Allowance 957,000    
Commercial [Member] | Commercial Other [Member] | Collateral Pledged by Leasehold Mortgage [Member]      
Total loans [Abstract]      
Recorded balance 5,100,000    
Commercial [Member] | Commercial Other [Member] | Collateral Pledged by Underground Coal Mining Equipment and Junior Real Estate Liens [Member]      
Total loans [Abstract]      
Recorded balance 4,100,000    
Commercial [Member] | Commercial Other [Member] | Collateralized by Commercial Real Estate and Liens on Furniture, Fixtures, and Equipment [Member]      
Total loans [Abstract]      
Recorded balance $ 400,000    
Commercial [Member] | Construction [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance   3,308,000 2,836,000
Unpaid Contractual Principal Balance   3,308,000 2,837,000
Average Investment in Impaired Loans   3,655,000 3,234,000
Interest Income Recognized   46,000 170,000
Loans with a specific valuation allowance [Abstract]      
Recorded Balance   324,000 174,000
Unpaid Contractual Principal Balance   324,000 174,000
Specific Allowance   164,000 99,000
Average Investment in Impaired Loans   324,000 215,000
Interest Income Recognized   3,000 11,000
Total loans [Abstract]      
Recorded balance   3,632,000 3,010,000
Unpaid Contractual Principal Balance   3,632,000 3,011,000
Specific Allowance   164,000 99,000
Average Investment in Impaired Loans   3,979,000 3,449,000
Interest Income Recognized   49,000 181,000
Commercial [Member] | Real Estate [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance   32,407,000 40,346,000
Unpaid Contractual Principal Balance   34,098,000 41,557,000
Average Investment in Impaired Loans   32,811,000 36,976,000
Interest Income Recognized   347,000 1,601,000
Loans with a specific valuation allowance [Abstract]      
Recorded Balance   1,922,000 1,033,000
Unpaid Contractual Principal Balance   3,060,000 2,176,000
Specific Allowance   847,000 227,000
Average Investment in Impaired Loans   1,966,000 1,678,000
Interest Income Recognized   10,000 15,000
Total loans [Abstract]      
Recorded balance   34,329,000 41,379,000
Unpaid Contractual Principal Balance   37,158,000 43,733,000
Specific Allowance   847,000 227,000
Average Investment in Impaired Loans   34,777,000 38,654,000
Interest Income Recognized   357,000 1,616,000
Residential [Member] | Construction [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance   0  
Unpaid Contractual Principal Balance   0  
Average Investment in Impaired Loans   0  
Interest Income Recognized   0  
Residential [Member] | Real Estate [Member]      
Loans without a specific valuation allowance [Abstract]      
Recorded Balance   2,337,000 2,309,000
Unpaid Contractual Principal Balance   2,337,000 2,309,000
Average Investment in Impaired Loans   2,329,000 2,385,000
Interest Income Recognized   19,000 85,000
Loans with a specific valuation allowance [Abstract]      
Specific Allowance   0 0
Total loans [Abstract]      
Recorded balance   2,337,000 2,309,000
Unpaid Contractual Principal Balance   2,337,000 2,309,000
Specific Allowance   0 0
Average Investment in Impaired Loans   2,329,000 2,385,000
Interest Income Recognized   $ 19,000 $ 85,000