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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
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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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- Definition 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. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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