Borrowings - Schedule of Borrowed Funds FHLB and Correspondent Bank Advances Maturity and Call Date (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Line Of Credit Facility [Line Items]
2020	$ 8,029	$ 1,400
2021	3,000	3,000
2022	5,000	5,000
2023	28,375	7,000
Total	69,404	36,400
2020	8,029	1,400
2021	3,000	3,000
2022	5,000	5,000
2023	28,375	7,000
Total	$ 69,404	$ 36,400
2020	2.86%	2.11%
2021	1.84%	1.84%
2022	1.97%	1.97%
2023	2.82%	2.12%
Total	2.69%	1.81%
Correspondent Bank
Line Of Credit Facility [Line Items]
Correspondent bank overnight line of credit advance	$ 25,000	$ 20,000
Correspondent bank overnight line of credit advance	$ 25,000	$ 20,000
Correspondent bank overnight line of credit advance	2.64%	1.64%