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Loans and the Allowance for Loan Losses, Past Due (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Loans, Aging [Abstract]      
Total Past Due $ 8,215   $ 13,096
Total Current Loans [1] 724,660   725,444
Total Loans [2] 732,875   738,540
Recorded Investment > 90 Days Past Due and Accruing 2,166   3,182
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 14,131   12,882
Interest income that would have been recorded under original loan terms [Abstract]      
Interest income that would have been recorded under original loan terms 130 $ 117  
Actual interest income recorded for the period 80 87  
Reduction in interest income on non accrual loans 50 $ 30  
30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 2,786   4,045
60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 1,166   1,618
90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 4,263   7,433
Guaranteed Student Loans [Member]      
Loans, Aging [Abstract]      
Total Past Due $ 2,800   $ 4,200
Guaranteed Student Loans [Member] | Minimum [Member]      
Loans, Aging [Abstract]      
Percentage of student loans guaranteed by federal government 97.00%   97.00%
Guaranteed Student Loans [Member] | Maximum [Member]      
Loans, Aging [Abstract]      
Percentage of student loans guaranteed by federal government 98.00%   98.00%
Mortgage Loans on Real Estate [Member]      
Loans, Aging [Abstract]      
Total Past Due $ 3,516   $ 5,424
Total Current Loans [1] 488,989   487,296
Total Loans 492,505   492,720
Recorded Investment > 90 Days Past Due and Accruing 45   306
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 13,301   12,046
Mortgage Loans on Real Estate [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 1,376   513
Mortgage Loans on Real Estate [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 588   943
Mortgage Loans on Real Estate [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 1,552   3,968
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]      
Loans, Aging [Abstract]      
Total Past Due 901   1,660
Total Current Loans [1] 101,527   99,361
Total Loans 102,428   101,021
Recorded Investment > 90 Days Past Due and Accruing 0   261
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 1,226   1,447
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 554   229
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 0   153
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 347   1,278
Mortgage Loans on Real Estate [Member] | Commercial [Member]      
Loans, Aging [Abstract]      
Total Past Due 1,289   2,718
Total Current Loans [1] 286,106   286,964
Total Loans 287,395   289,682
Recorded Investment > 90 Days Past Due and Accruing 0   0
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 10,924   9,468
Mortgage Loans on Real Estate [Member] | Commercial [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 315   194
Mortgage Loans on Real Estate [Member] | Commercial [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 588   771
Mortgage Loans on Real Estate [Member] | Commercial [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 386   1,753
Mortgage Loans on Real Estate [Member] | Construction [Member]      
Loans, Aging [Abstract]      
Total Past Due 721   721
Total Current Loans [1] 28,333   26,768
Total Loans 29,054   27,489
Recorded Investment > 90 Days Past Due and Accruing 0   0
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 722   721
Mortgage Loans on Real Estate [Member] | Construction [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 0   0
Mortgage Loans on Real Estate [Member] | Construction [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 0   0
Mortgage Loans on Real Estate [Member] | Construction [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 721   721
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member]      
Loans, Aging [Abstract]      
Total Past Due 98   178
Total Current Loans [1] 18,623   17,740
Total Loans 18,721   17,918
Recorded Investment > 90 Days Past Due and Accruing 45   45
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 118   118
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 53   15
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 0   0
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 45   163
Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]      
Loans, Aging [Abstract]      
Total Past Due 507   147
Total Current Loans [1] 54,400   56,463
Total Loans 54,907   56,610
Recorded Investment > 90 Days Past Due and Accruing 0   0
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 311   292
Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 454   75
Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 0   19
Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 53   53
Commercial [Member]      
Loans, Aging [Abstract]      
Total Loans 57,019   60,398
Loans in nonaccrual status by class of loan [Abstract]      
Loans in nonaccrual status 830   836
Commercial [Member] | Commercial and Industrial Loans [Member]      
Loans, Aging [Abstract]      
Total Loans 57,019   60,398
Commercial [Member] | Commercial Loan [Member]      
Loans, Aging [Abstract]      
Total Past Due 738   1,769
Total Current Loans [1] 56,281   58,629
Total Loans 57,019   60,398
Recorded Investment > 90 Days Past Due and Accruing 0   471
Commercial [Member] | Commercial Loan [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 145   709
Commercial [Member] | Commercial Loan [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 3   0
Commercial [Member] | Commercial Loan [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 590   1,060
Consumer [Member]      
Loans, Aging [Abstract]      
Total Loans 173,021 [3]   174,225
Consumer [Member] | Consumer Automobile Loans [Member]      
Loans, Aging [Abstract]      
Total Past Due 808   680
Total Current Loans [1] 119,552   118,571
Total Loans 120,360   119,251
Recorded Investment > 90 Days Past Due and Accruing 142   41
Consumer [Member] | Consumer Automobile Loans [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 572   517
Consumer [Member] | Consumer Automobile Loans [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 94   122
Consumer [Member] | Consumer Automobile Loans [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 142   41
Consumer [Member] | Other Consumer Loans [Member]      
Loans, Aging [Abstract]      
Total Past Due 3,077   5,126
Total Current Loans [1] 49,584   49,848
Total Loans 52,661   54,974
Recorded Investment > 90 Days Past Due and Accruing 1,962   2,360
Consumer [Member] | Other Consumer Loans [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 642   2,222
Consumer [Member] | Other Consumer Loans [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 472   544
Consumer [Member] | Other Consumer Loans [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 1,963   2,360
Other [Member]      
Loans, Aging [Abstract]      
Total Past Due 76   97
Total Current Loans [1] 10,254   11,100
Total Loans 10,330   11,197
Recorded Investment > 90 Days Past Due and Accruing 17   4
Other [Member] | 30 - 59 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 51   84
Other [Member] | 60 - 89 Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due 9   9
Other [Member] | 90 or More Days Past Due [Member]      
Loans, Aging [Abstract]      
Total Past Due $ 16   $ 4
[1] For purposes of this table, Total Current Loans includes loans that are 1 - 29 days past due.
[2] Net deferred loan fees totaled $906 thousand and $916 thousand at March 31, 2018 and December 31, 2017, respectively.
[3] The consumer segment includes consumer automobile loans.