Loans - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	$ 9,636	$ 9,139
Provision for loan losses		575
Charge-offs	(17)
Recoveries		2
Ending balance	9,619	9,716
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	4,805	4,801
Provision for loan losses	391	410
Ending balance	5,196	5,211
SBA Loans-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	894	1,082
Provision for loan losses	53	(76)
Charge-offs	(17)
Ending balance	930	1,006
SBA Loans—Non-Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	505	538
Provision for loan losses	(376)	(39)
Recoveries		2
Ending balance	129	501
Commercial and Industrial
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	1,746	1,265
Provision for loan losses	(73)	315
Ending balance	1,673	1,580
Home Mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	1,653	1,408
Provision for loan losses	7	(32)
Ending balance	1,660	1,376
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	33	45
Provision for loan losses	(2)	(3)
Ending balance	$ 31	$ 42