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Loans, Collateral Dependent Loans and Loans With/Without Specific Valuation Allowance (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Loan
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Loans with a specific valuation allowance [Abstract]        
Specific Allowance $ 672   $ 672 $ 1,212
Total loans [Abstract]        
Recorded balance 56,315   56,315 57,771
Unpaid Contractual Principal Balance 61,020   61,020 61,786
Specific Allowance 672   672 1,212
Average Investment in Impaired Loans 57,291   54,740 55,700
Interest Income Recognized 603   1,821 2,371
Commercial [Member] | Collateral Pledged [Member]        
Loans with a specific valuation allowance [Abstract]        
Specific Allowance   $ 800    
Total loans [Abstract]        
Number of Loans | Loan   21    
Recorded balance   $ 60,759    
Specific Allowance   800    
Commercial [Member] | Hotel/Motel [Member] | Collateral Pledged [Member]        
Loans with a specific valuation allowance [Abstract]        
Specific Allowance   $ 250    
Total loans [Abstract]        
Number of Loans | Loan   4    
Recorded balance   $ 24,357    
Specific Allowance   250    
Commercial [Member] | Commercial Real Estate Residential [Member] | Collateral Pledged [Member]        
Loans with a specific valuation allowance [Abstract]        
Specific Allowance   $ 0    
Total loans [Abstract]        
Number of Loans | Loan   4    
Recorded balance   $ 7,932    
Specific Allowance   0    
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Collateral Pledged [Member]        
Loans with a specific valuation allowance [Abstract]        
Specific Allowance   $ 200    
Total loans [Abstract]        
Number of Loans | Loan   11    
Recorded balance   $ 22,383    
Specific Allowance   200    
Commercial [Member] | Commercial Other [Member]        
Loans without a specific valuation allowance [Abstract]        
Recorded Balance 10,690   10,690 7,829
Unpaid Contractual Principal Balance 12,384   12,384 9,489
Average Investment in Impaired Loans 10,863   10,425 9,889
Interest Income Recognized 92   380 460
Loans with a specific valuation allowance [Abstract]        
Recorded Balance 347   347 3,244
Unpaid Contractual Principal Balance 347   347 3,244
Specific Allowance 175   175 886
Average Investment in Impaired Loans 358   680 1,323
Interest Income Recognized 6   29 29
Total loans [Abstract]        
Recorded balance 11,037   11,037 11,073
Unpaid Contractual Principal Balance 12,731   12,731 12,733
Specific Allowance 175   175 886
Average Investment in Impaired Loans 11,221   11,105 11,212
Interest Income Recognized 98   409 489
Commercial [Member] | Commercial Other [Member] | Collateral Pledged [Member]        
Loans with a specific valuation allowance [Abstract]        
Specific Allowance   $ 350    
Total loans [Abstract]        
Number of Loans | Loan   2    
Recorded balance   $ 6,087    
Specific Allowance   350    
Commercial [Member] | Commercial Other [Member] | Collateral Pledged by Leasehold Mortgage [Member]        
Total loans [Abstract]        
Recorded balance   5,100    
Commercial [Member] | Commercial Other [Member] | Collateral Pledged by Underground Coal Mining Equipment and Junior Real Estate Liens [Member]        
Total loans [Abstract]        
Recorded balance   $ 1,000    
Commercial [Member] | Construction [Member]        
Loans without a specific valuation allowance [Abstract]        
Recorded Balance 2,800   2,800 2,836
Unpaid Contractual Principal Balance 2,800   2,800 2,837
Average Investment in Impaired Loans 2,959   3,344 3,234
Interest Income Recognized 37   132 170
Loans with a specific valuation allowance [Abstract]        
Recorded Balance 174   174 174
Unpaid Contractual Principal Balance 174   174 174
Specific Allowance 99   99 99
Average Investment in Impaired Loans 174   229 215
Interest Income Recognized 3   9 11
Total loans [Abstract]        
Recorded balance 2,974   2,974 3,010
Unpaid Contractual Principal Balance 2,974   2,974 3,011
Specific Allowance 99   99 99
Average Investment in Impaired Loans 3,133   3,573 3,449
Interest Income Recognized 40   141 181
Commercial [Member] | Real Estate [Member]        
Loans without a specific valuation allowance [Abstract]        
Recorded Balance 38,620   38,620 40,346
Unpaid Contractual Principal Balance 40,134   40,134 41,557
Average Investment in Impaired Loans 39,217   35,762 36,976
Interest Income Recognized 442   1,192 1,601
Loans with a specific valuation allowance [Abstract]        
Recorded Balance 1,366   1,366 1,033
Unpaid Contractual Principal Balance 2,863   2,863 2,176
Specific Allowance 398   398 227
Average Investment in Impaired Loans 1,397   1,892 1,678
Interest Income Recognized 0   15 15
Total loans [Abstract]        
Recorded balance 39,986   39,986 41,379
Unpaid Contractual Principal Balance 42,997   42,997 43,733
Specific Allowance 398   398 227
Average Investment in Impaired Loans 40,614   37,654 38,654
Interest Income Recognized 442   1,207 1,616
Residential [Member] | Real Estate [Member]        
Loans without a specific valuation allowance [Abstract]        
Recorded Balance 2,318   2,318 2,309
Unpaid Contractual Principal Balance 2,318   2,318 2,309
Average Investment in Impaired Loans 2,323   2,408 2,385
Interest Income Recognized 23   64 85
Loans with a specific valuation allowance [Abstract]        
Specific Allowance 0   0 0
Total loans [Abstract]        
Recorded balance 2,318   2,318 2,309
Unpaid Contractual Principal Balance 2,318   2,318 2,309
Specific Allowance 0   0 0
Average Investment in Impaired Loans 2,323   2,408 2,385
Interest Income Recognized $ 23   $ 64 $ 85