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Acquisition of First Priority Financial Corp. (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Business Acquisition [Line Items]
Net interest income after loan loss provision	$ 15,811	$ 9,516	$ 37,978	$ 27,876
Noninterest income	2,165	1,564	5,371	4,362
Noninterest expense	15,264	7,960	36,189	23,320
First Priority Financial Corp. [Member]
Business Acquisition [Line Items]
Net interest income after loan loss provision	17,373	11,089	48,914	41,480
Noninterest income	2,220	1,688	5,754	5,000
Noninterest expense	13,543	10,677	41,532	37,757
Net income	$ 5,502	$ 1,533	$ 10,995	$ 6,368
Net income per common share	$ 0.70	$ 0.25	$ 1.49	$ 0.97

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
-Name Accounting Standards Codification
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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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Amount of interest income or expense, including any amortization and accretion (as applicable) of discounts and premiums, including consideration of the provisions for loan, lease, credit, and other related losses.

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