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Acquisition of First Priority Financial Corp. (Narrative) (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 62,840,000 | $ 62,840,000 |  |
Amortization expense |  | 1,398,000 | 1,430,000 | $ 1,224,000 |
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 |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable | $ 76,122,000 |  |  |  |
Payments to acquire businesses gross | 3,807,000 |  |  |  |
Business combination consideration transferred | 79,929,000 |  |  |  |
Goodwill | 39,744,000 |  |  |  |
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 | $ 390,000 |  |  |  |
Core deposit intangible amortization expense related to acquisition for year two | 339,000 |  |  |  |
Core deposit intangible amortization expense related to acquisition for year three | 288,000 |  |  |  |
Core deposit intangible amortization expense related to acquisition for year four | 236,000 |  |  |  |
Core deposit intangible amortization expense related to acquisition for year five | 185,000 |  |  |  |
Core deposit intangible amortization expense related to acquisition for four years after year five | 244,000 |  |  |  |
Fair value of purchased loans | $ 511,623,000 |  |  |  |
Pro forma earnings |  |  |  | 15,469,000 | $ 9,170,000
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 |  |  |  | 3,486,000 |
Income tax nondeductible expenses |  |  |  | $ 714,000 |
First Priority Financial Corp. [Member] | Core Deposits [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization expense |  | $ 442,000 | $ 493,000 |  |
First Priority Financial Corp. [Member] | Series D [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Preferred Stock, Shares Issued | 3,404 |  |  |  |
Preferred stock, value | $ 3,404,000 |  |  |  |
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 |  |  |  |
First Priority Financial Corp. [Member] | Common Stock [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Per share price | $ 32.80 |  |  |  |
Business combination, consideration transferred, equity interests issued and issuable | $ 76,122,000 |  |  |  |

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