Fair Value - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Related allowance	$ 8,000	$ 19,000	$ 8,000	$ 19,000	$ 120,000
Provision for loan losses	201,000	121,000	363,000	302,000
Write-downs	0	0	$ 0	0
Discount rate			10.00%
Loans classified as TDRs	537,000		$ 537,000		239,000
Residential Real Estate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans classified as TDRs					58,000
Market and Income Approach Valuation Technique
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired financing receivable, recorded investment	0		0		1,200,000
Related allowance					$ 120,000
Market and Income Approach Valuation Technique | Impaired Loans
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Provision for loan losses	$ 0	$ 0	$ 0	$ 0