Fair Value Measurements, Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	$ 157,121	$ 199,365
Loans, net of allowances for loan losses	729,092	595,637
Loans held for sale	779
US Treasury Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale		20,000
Obligations of US Government Agencies [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	9,435	9,195
Obligations of State and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	64,765	77,987
Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	74,296	83,694
Money Market Investments [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	1,194	647
Other Marketable Equity Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	197	164
Recurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	157,121	199,365
Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale		20,000
Recurring [Member] | Obligations of US Government Agencies [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	9,435	9,195
Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	64,765	77,987
Recurring [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	74,296	83,694
Recurring [Member] | Money Market Investments [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	1,194	647
Recurring [Member] | Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	7,234	7,678
Recurring [Member] | Other Marketable Equity Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	197	164
Nonrecurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	567	2,675
Loans held for sale	779
Other assets, fair value disclosure		940
Nonrecurring [Member] | Mortgage Loans on Real Estate [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		1,957
Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	264	400
Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		1,483
Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	74	74
Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	229
Nonrecurring [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		718
Nonrecurring [Member] | Other Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Other assets, fair value disclosure		940
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Loans, net of allowances for loan losses	0	0
Loans held for sale	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Obligations of US Government Agencies [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Money Market Investments [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Recurring [Member] | Other Marketable Equity Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0	0
Loans held for sale	0
Other assets, fair value disclosure		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Nonrecurring [Member] | Other Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Other assets, fair value disclosure		0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	157,121	199,365
Loans, net of allowances for loan losses	0	0
Loans held for sale	779
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	157,121	199,365
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale		20,000
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Obligations of US Government Agencies [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	9,435	9,195
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	64,765	77,987
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	74,296	83,694
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Money Market Investments [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	1,194	647
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	7,234	7,678
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Other Marketable Equity Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	197	164
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0	0
Loans held for sale	779
Other assets, fair value disclosure		0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0	0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0	0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member] | Other Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Other assets, fair value disclosure		0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Loans, net of allowances for loan losses	722,464	594,190
Loans held for sale	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | US Treasury Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale		0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Obligations of US Government Agencies [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Obligations of State and Political Subdivisions [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Mortgage-Backed Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Money Market Investments [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Corporate Bonds [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Other Marketable Equity Securities [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Securities available-for-sale	0	0
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	567	1,957
Loans held for sale	0
Other assets, fair value disclosure		940
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		1,957
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Residential 1-4 Family [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	264	400
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		1,483
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	74	74
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Mortgage Loans on Real Estate [Member] | Equity Line of Credit [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses	$ 229
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Commercial [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Loans, net of allowances for loan losses		718
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member] | Other Real Estate [Member] | Construction [Member]
Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract]
Other assets, fair value disclosure		$ 940