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Subsequent Events (Narrative) (Details) - USD ($) |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2018 | Jan. 16, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Subsequent Event [Line Items] |  |  |  |
Total assets |  |  | $ 1,415,647,000 | $ 1,170,354,000
Total deposits |  |  | $ 1,236,518,000 | $ 1,023,568,000
Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Acquisition completion date | Jul. 31, 2018 |  |  |
First Priority Financial Corp. [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Plan of merger agreement, date |  | Jan. 16, 2018 |  |
Shares of acquirer ratio of common stock |  | 34.81% |  |
Per share price |  | $ 11.07 |  |
Period prior to closing of merger for calculating average price |  |  | 30 days |
Total assets |  |  | $ 627,428,000 |
Total bank loans |  |  | 522,036,000 |
Total deposits |  |  | $ 513,582,000 |
First Priority Financial Corp. [Member] | Subsequent Event [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares | 2,300,000 |  |  |
Payments to Acquire Businesses, Gross | $ 3,900,000 |  |  |
Number of outstanding preferred shares issued in exchange | 3,404 |  |  |
Business Combination, Consideration Transferred | $ 79,904,000 |  |  |
First Priority Financial Corp. [Member] | Subsequent Event [Member] | Series D Preferred Stock [Member] |  |  |  |
Subsequent Event [Line Items] |  |  |  |
Preferred Stock, Shares Issued | 3,404 |  |  |
Preferred Stock, Dividend Rate, Percentage | 9.00% |  |  |

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