Loans and Allowance for Loan Losses - ALL Roll Forward (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	$ 9,097	$ 7,074	$ 8,275	$ 5,860
Charged off loans	(107)	(258)	(652)	(500)
Recoveries of charge-offs	78	38	255	189
Provision (reallocation) charged to expense	724	302	1,914	1,607
Ending balance	9,792	7,156	9,792	7,156
Commercial Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	4,102	3,135	3,639	2,465
Charged off loans	(36)	0	(36)	(38)
Recoveries of charge-offs	39	0	63	0
Provision (reallocation) charged to expense	155	110	594	818
Ending balance	4,260	3,245	4,260	3,245
Consumer Real Estate [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,189	1,528	1,789	1,596
Charged off loans	(1)	(2)	(3)	(27)
Recoveries of charge-offs	17	5	37	55
Provision (reallocation) charged to expense	65	67	447	(26)
Ending balance	2,270	1,598	2,270	1,598
Construction and Land Development [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	946	744	795	521
Charged off loans	0	0	0	0
Recoveries of charge-offs	3	2	7	7
Provision (reallocation) charged to expense	94	(37)	241	181
Ending balance	1,043	709	1,043	709
Commercial and Industrial [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,746	1,367	1,746	1,062
Charged off loans	(20)	(100)	(353)	(178)
Recoveries of charge-offs	12	9	66	65
Provision (reallocation) charged to expense	410	86	689	413
Ending balance	2,148	1,362	2,148	1,362
Consumer and Other [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	114	300	306	216
Charged off loans	(50)	(156)	(260)	(257)
Recoveries of charge-offs	7	22	82	62
Provision (reallocation) charged to expense	0	76	(57)	221
Ending balance	$ 71	$ 242	$ 71	$ 242