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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, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Net interest income after loan loss provision	$ 17,070	$ 17,202	$ 17,305	$ 17,181	$ 17,456	$ 15,811	$ 11,414	$ 10,753	$ 68,758	$ 55,434	$ 37,263
Noninterest income	4,695	3,003	2,874	2,049	2,091	2,165	1,559	1,647	12,621	7,462	5,707
Noninterest expense	$ 16,171	$ 14,683	$ 14,796	$ 14,303	$ 13,982	$ 15,264	$ 9,742	$ 11,183	$ 59,953	50,171	31,381
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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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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