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Acquisition of First Priority Financial Corp. (Narrative) (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 08, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 62,767,000 |  | $ 62,767,000 |  |  | $ 3,918,000
First Priority Financial Corp. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Acquisition completion date | Jul. 31, 2018 |  |  |  |  |  |
Shares of acquirer ratio of common stock | 34.81% |  |  |  |  |  |
Per share price | $ 11.07 |  |  |  |  |  |
Common stock shares issued to acquire the company | 2,320,800 |  |  |  |  |  |
Payments to acquire businesses gross | $ 3,807,000 |  |  |  |  |  |
Business combination consideration transferred | 79,929,000 |  |  |  |  |  |
Goodwill | 39,659,000 |  |  |  |  |  |
Intangible assets acquired (finite lived) | 2,832,000 |  |  |  |  |  |
Intangible assets acquired (indefinite lived) | $ 205,000 |  |  |  |  |  |
Intangible assets, amortization period | 10 years |  |  |  |  |  |
Core deposit intangible amortization expense related to acquisition for year one | $ 215,000 |  |  |  |  |  |
Core deposit intangible amortization expense related to acquisition for year two | 493,000 |  |  |  |  |  |
Core deposit intangible amortization expense related to acquisition for year three | 442,000 |  |  |  |  |  |
Core deposit intangible amortization expense related to acquisition for year four | 390,000 |  |  |  |  |  |
Core deposit intangible amortization expense related to acquisition for year five | 339,000 |  |  |  |  |  |
Core deposit intangible amortization expense related to acquisition for after year five | 953,000 |  |  |  |  |  |
Fair value of purchased loans | 511,623,000 |  |  |  |  | $ 511,623,000 |
Pro Forma Earnings |  | $ 5,502,000 | $ 1,533,000 | 10,995,000 | $ 6,368,000 |  |
Severance and retention bonus expenses |  |  |  | 1,475,000 |  |  |
First Priority Financial Corp. [Member] | Excluded Acquisition-related Costs [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Pro Forma Earnings |  |  |  | $ 3,661,000 |  |  |
First Priority Financial Corp. [Member] | Stock Options [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire businesses gross | 3,801,000 |  |  |  |  |  |
First Priority Financial Corp. [Member] | Fractional Shares [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to acquire businesses gross | $ 6,000 |  |  |  |  |  |

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