Loans - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses, Period Increase (Increase)	$ 27,000	$ 16,000	$ 21,000	$ 21,000
Loans and Leases Receivable, Loans in Process	134,794,000		134,794,000		$ 123,293,000
Allowances for loan losses reversed			0	$ 0
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Loans in Process	705,000		705,000		796,000
TDRs [Member]
Financing Receivable, Modifications, Recorded Investment	17,300,000		17,300,000		19,200,000
Specified Reserves, Provision for Troubled Debt Restructurings	399,000		399,000		581,000
Loans and Leases Receivable, Impaired, Commitment to Lend	315,000		315,000		$ 169,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down			6,900,000
TDRs [Member] | Subsequently Defaulted [Member]
Financing Receivable, Allowance for Credit Losses, Period Increase (Increase)	$ 5,000		$ 4,000