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Loans and Allowance for Loan Losses, Troubled Debt Restructuring (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Modification
Contract
Dec. 31, 2016
USD ($)
Modification
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification 4 12
Recorded Investment Prior to Modification $ 5,274 $ 1,517
Recorded Investment After Modification 5,274 1,517
Current Investment 5,272 1,275
Outstanding commitments on TDR's 0 0
Defaulting TDR's within twelve months of restructuring $ 0 0
Interest Rate Below Market Reduction [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Contract 2  
Terms Not Otherwise Available [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Contract 2  
Residential 1-4 Family [Member]    
Financing Receivable, Modifications [Line Items]    
Loans in process for foreclosure $ 77 $ 10
Mortgage Loans on Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification   9
Recorded Investment Prior to Modification   $ 1,357
Recorded Investment After Modification   1,357
Current Investment   $ 1,131
Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification 1 6
Recorded Investment Prior to Modification $ 142 $ 1,061
Recorded Investment After Modification 142 1,061
Current Investment $ 140 $ 992
Mortgage Loans on Real Estate [Member] | Commercial [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification 3 1
Recorded Investment Prior to Modification $ 5,132 $ 150
Recorded Investment After Modification 5,132 150
Current Investment $ 5,132 $ 0
Mortgage Loans on Real Estate [Member] | Second Mortgages [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification   1
Recorded Investment Prior to Modification   $ 53
Recorded Investment After Modification   53
Current Investment   $ 53
Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification   1
Recorded Investment Prior to Modification   $ 93
Recorded Investment After Modification   93
Current Investment   $ 86
Commercial [Member] | Commercial and Industrial Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification   1
Recorded Investment Prior to Modification   $ 152
Recorded Investment After Modification   152
Current Investment   $ 144
Consumer [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Modifications | Modification   2
Recorded Investment Prior to Modification   $ 8
Recorded Investment After Modification   8
Current Investment   $ 0