Fair Value Accounting (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities available for sale
US government agencies	$ 7,530	$ 8,653
SBA securities	3,825	4,063
State and political subdivisions	6,348	11,396
Mortgage-backed securities	40,803	43,491
Mortgage loans held for sale	10,885	11,790
Mortgage loan interest rate lock commitments	384	196
Total assets measured at fair value on a recurring basis	69,775	79,589
Liabilities
MBS forward sales commitments	88	28
Total liabilities measured at fair value on a recurring basis	88	28
Level 1 [Member]
Securities available for sale
US government agencies
SBA securities
State and political subdivisions
Mortgage-backed securities
Mortgage loans held for sale
Mortgage loan interest rate lock commitments
Total assets measured at fair value on a recurring basis
Liabilities
MBS forward sales commitments
Total liabilities measured at fair value on a recurring basis
Level 2 [Member]
Securities available for sale
US government agencies	7,530	8,653
SBA securities	3,825	4,063
State and political subdivisions	6,348	11,396
Mortgage-backed securities	40,803	43,491
Mortgage loans held for sale	10,885	11,790
Mortgage loan interest rate lock commitments	384	196
Total assets measured at fair value on a recurring basis	69,775	79,589
Liabilities
MBS forward sales commitments	88	28
Total liabilities measured at fair value on a recurring basis	88	28
Level 3 [Member]
Securities available for sale
US government agencies
SBA securities
State and political subdivisions
Mortgage-backed securities
Mortgage loans held for sale
Mortgage loan interest rate lock commitments
Total assets measured at fair value on a recurring basis
Liabilities
MBS forward sales commitments
Total liabilities measured at fair value on a recurring basis