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Fair Value Measurement Fair Values and Carrying Amounts, Significant Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents $ 29,900 $ 37,289 $ 13,900 $ 38,508
Interest bearing deposits in banks 7,062 9,300    
Investment securities 85,886 73,961    
Loans held for sale 13,561 2,899    
Loans, net 657,916 642,461    
Deposits        
Noninterest bearing 137,239 132,971    
Interest bearing 419,646 444,722    
Time 159,844 129,077    
Residential Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 192,617 187,320    
Construction Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 63,245 55,322    
Commercial Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 284,271 276,500    
Commercial [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 44,536 47,228    
Consumer [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 3,566 3,241    
Municipal [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 69,681 72,850    
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 29,900 37,289    
Investment securities 612 556    
Deposits        
Noninterest bearing 137,239 132,971    
Interest bearing 419,646 444,722    
Borrowed funds [Abstract]        
Short-term, Fair Value   370    
Significant Other Observable Inputs (Level 2) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Interest bearing deposits in banks 7,150 9,177    
Investment securities 85,274 73,405    
Loans held for sale 13,833 2,954    
Accrued interest receivable 446 423    
Deposits        
Time 159,709 127,554    
Borrowed funds [Abstract]        
Long-term, Fair Value 46,918 27,374    
Accrued interest payable 543 203    
Significant Unobservable Inputs (Level 3) [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Accrued interest receivable 2,256 2,389    
Significant Unobservable Inputs (Level 3) [Member] | Residential Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 192,027 183,836    
Significant Unobservable Inputs (Level 3) [Member] | Construction Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 62,296 54,694    
Significant Unobservable Inputs (Level 3) [Member] | Commercial Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 283,431 272,187    
Significant Unobservable Inputs (Level 3) [Member] | Commercial [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 42,959 45,713    
Significant Unobservable Inputs (Level 3) [Member] | Consumer [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 3,496 3,193    
Significant Unobservable Inputs (Level 3) [Member] | Municipal [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 69,682 72,689    
Carrying Amount [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 29,900 37,289    
Interest bearing deposits in banks 7,062 9,300    
Investment securities 85,886 73,961    
Loans held for sale 13,561 2,899    
Accrued interest receivable 2,702 2,812    
Nonmarketable equity securities 2,607 2,376    
Deposits        
Noninterest bearing 137,239 132,971    
Interest bearing 419,646 444,722    
Time 159,844 129,077    
Borrowed funds [Abstract]        
Short-term   370    
Long-term 47,164 27,451    
Accrued interest payable 543 203    
Carrying Amount [Member] | Residential Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 191,497 186,225    
Carrying Amount [Member] | Construction Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 62,651 54,786    
Carrying Amount [Member] | Commercial Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 281,417 273,609    
Carrying Amount [Member] | Commercial [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 44,277 46,943    
Carrying Amount [Member] | Consumer [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 3,546 3,223    
Carrying Amount [Member] | Municipal [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net 69,708 72,874    
Estimated Fair Value [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Cash and cash equivalents 29,900 37,289    
Interest bearing deposits in banks 7,150 9,177    
Investment securities 85,886 73,961    
Loans held for sale 13,833 2,954    
Accrued interest receivable 2,702 2,812    
Deposits        
Noninterest bearing 137,239 132,971    
Interest bearing 419,646 444,722    
Time 159,709 127,554    
Borrowed funds [Abstract]        
Short-term, Fair Value   370    
Long-term, Fair Value 46,918 27,374    
Accrued interest payable 543 203    
Estimated Fair Value [Member] | Residential Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 192,027 183,836    
Estimated Fair Value [Member] | Construction Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 62,296 54,694    
Estimated Fair Value [Member] | Commercial Real Estate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 283,431 272,187    
Estimated Fair Value [Member] | Commercial [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 42,959 45,713    
Estimated Fair Value [Member] | Consumer [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value 3,496 3,193    
Estimated Fair Value [Member] | Municipal [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Loans, net, Fair Value $ 69,682 $ 72,689