Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	$ 10,214	$ 9,932
Charge-Offs	(375)	(171)
Recoveries	43	94
Provision (Credit)	50	225
Balance at End of Period	9,932	10,080
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	4,299	4,041
Charge-Offs	0	0
Recoveries	1	7
Provision (Credit)	(316)	(24)
Balance at End of Period	3,984	4,024
Commercial loans secured by real estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	3,666	3,584
Charge-Offs	(162)	(14)
Recoveries	11	2
Provision (Credit)	35	175
Balance at End of Period	3,550	3,747
Real estate-mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	1,102	1,169
Charge-Offs	(114)	(94)
Recoveries	19	66
Provision (Credit)	260	26
Balance at End of Period	1,267	1,167
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	128	151
Charge-Offs	(99)	(63)
Recoveries	12	19
Provision (Credit)	101	42
Balance at End of Period	142	149
Allocation for general risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at Beginning of Period	1,019	987
Charge-Offs	0	0
Recoveries	0	0
Provision (Credit)	(30)	6
Balance at End of Period	$ 989	$ 993