Impaired Loans and Allowance for Loan Losses - Modified Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Number	Dec. 31, 2015 USD ($) Number
Financing Receivable, Modifications [Line Items]
Number of Contracts | Number	5	7
Pre-Modification Outstanding Recorded Investment	$ 1,189	$ 2,176
Post-Modification Outstanding Recorded Investment	1,037	2,076
Specific Reserve Recorded	0	0
Valuation Allowance Recorded	$ 152	$ 100
Construction and Land Development [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Number	1	2
Pre-Modification Outstanding Recorded Investment	$ 20	$ 220
Post-Modification Outstanding Recorded Investment	18	218
Specific Reserve Recorded	0	0
Valuation Allowance Recorded	$ 2	$ 2
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Number	4	1
Pre-Modification Outstanding Recorded Investment	$ 1,169	$ 27
Post-Modification Outstanding Recorded Investment	1,019	26
Specific Reserve Recorded	0	0
Valuation Allowance Recorded	$ 150	$ 1
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Number		3
Pre-Modification Outstanding Recorded Investment		$ 1,881
Post-Modification Outstanding Recorded Investment		1,787
Specific Reserve Recorded		0
Valuation Allowance Recorded		$ 94
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Contracts | Number		1
Pre-Modification Outstanding Recorded Investment		$ 48
Post-Modification Outstanding Recorded Investment		45
Specific Reserve Recorded		0
Valuation Allowance Recorded		$ 3