Loans - Additional Information Related to Accruing TDR's (Details) - Accruing TDR [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Loans [Line Items]
Recorded investment	$ 2,207	$ 4,073
Average year-to- date recorded investment	2,220	4,250
Unpaid principal balance	2,379	4,556
Unfunded commitments to fund TDRs	162	12
Commercial [Member]
Loans [Line Items]
Recorded investment	941	2,730
Average year-to- date recorded investment	943	2,827
Unpaid principal balance	1,061	3,155
Unfunded commitments to fund TDRs	150
Commercial Real Estate [Member]
Loans [Line Items]
Recorded investment	195	229
Average year-to- date recorded investment	198	260
Unpaid principal balance	240	280
Residential Real Estate Segment [Member]
Loans [Line Items]
Recorded investment	1,071	1,114
Average year-to- date recorded investment	1,079	1,163
Unpaid principal balance	1,078	1,121
Unfunded commitments to fund TDRs	$ 12	$ 12