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Acquisition of First Priority Financial Corp. (Pro Forma Information) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net interest income after loan loss provision	$ 17,456	$ 15,811	$ 11,414	$ 10,753	$ 9,387	$ 9,516	$ 9,310	$ 9,050	$ 55,434	$ 37,263	$ 32,975
Noninterest income	2,091	2,165	1,559	1,647	1,331	1,564	1,362	1,436	7,462	5,707	5,946
Noninterest expense	$ 13,982	$ 15,264	$ 9,742	$ 11,183	$ 8,047	$ 7,960	$ 7,558	$ 7,802	50,171	31,381	$ 28,840
First Priority Financial Corp. [Member]
Business Acquisition [Line Items]
Net interest income after loan loss provision									66,370	55,082
Noninterest income									7,845	6,748
Noninterest expense									55,689	49,268
Net income									$ 15,469	$ 9,170
Net income per common share									$ 1.84	$ 1.40

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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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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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