Loans - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	$ 9,525	$ 9,723	$ 9,636	$ 9,139
Provision for loan losses	290	439	691	1,047
Charge-offs	(175)	(622)	(688)	(650)
Recoveries		11	1	15
Ending balance	9,640	9,551	9,640	9,551
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	5,554	4,804	4,805	4,801
Provision for loan losses	102	271	851	274
Ending balance	5,656	5,075	5,656	5,075
SBA Loans-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	933	978	894	1,082
Provision for loan losses		30	59	(74)
Charge-offs			(20)
Ending balance	933	1,008	933	1,008
SBA Loans—Non-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	119	536	505	538
Provision for loan losses	(2)	89	(388)	112
Charge-offs		(57)		(85)
Recoveries		6		9
Ending balance	117	574	117	574
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	1,266	1,877	1,746	1,265
Provision for loan losses	171	43	184	654
Charge-offs	(175)	(565)	(668)	(565)
Recoveries		5		6
Ending balance	1,262	1,360	1,262	1,360
Home Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	1,609	1,489	1,653	1,408
Provision for loan losses	26	12	(18)	93
Ending balance	1,635	1,501	1,635	1,501
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	44	39	33	45
Provision for loan losses	(7)	(6)	3	(12)
Recoveries			1
Ending balance	$ 37	$ 33	$ 37	$ 33