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Consolidated Statements of Changes In Shareholders' Equity - USD ($) $ in Thousands | Total | First Priority Financial Corp. [Member] | Scottdale Bank and Trust Company [Member] | Series D [Member] | Series D [Member] First Priority Financial Corp. [Member] | Preferred Stock [Member] | Preferred Stock [Member] Series D [Member] First Priority Financial Corp. [Member] | Common Stock [Member] | Common Stock [Member] First Priority Financial Corp. [Member] | Common Stock [Member] Scottdale Bank and Trust Company [Member] | Additional Paid-in Capital [Member] | Additional Paid-in Capital [Member] First Priority Financial Corp. [Member] | Additional Paid-in Capital [Member] Scottdale Bank and Trust Company [Member] | Retained Earnings [Member] | Retained Earnings [Member] Series D [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 70,467 |  |  |  |  |  |  | $ 4,233 |  |  | $ 40,688 |  |  | $ 28,399 |  | $ (2,853)
Net income | 6,588 |  |  |  |  |  |  |  |  |  |  |  |  | 6,588 |  |
Total other comprehensive loss, net of taxes | 1,823 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,823
Common stock dividends declared | (1,653) |  |  |  |  |  |  |  |  |  |  |  |  | (1,653) |  |
Employee Stock Purchase Plan | 76 |  |  |  |  |  |  | 3 |  |  | 73 |  |  |  |  |
Director Stock Purchase Plan | 21 |  |  |  |  |  |  | 1 |  |  | 20 |  |  |  |  |
Restricted stock activity | 69 |  |  |  |  |  |  | 4 |  |  | 65 |  |  |  |  |
Balance at Sep. 30, 2017 | 77,391 |  |  |  |  |  |  | 4,241 |  |  | 40,846 |  |  | 33,334 |  | (1,030)
Balance at Dec. 31, 2017 | 75,703 |  |  |  |  |  |  | 4,242 |  |  | 40,970 |  |  | 32,565 |  | (2,074)
Impact of adoption of new accounting standard (ASU 2016-01 [Member]) at Dec. 31, 2017 | (9) |  |  |  |  |  |  |  |  |  |  |  |  | (44) |  | 35
Balance at Dec. 31, 2017 | 75,694 |  |  |  |  |  |  | 4,242 |  |  | 40,970 |  |  | 32,521 |  | (2,039)
Net income | 5,947 |  |  |  |  |  |  |  |  |  |  |  |  | 5,947 |  |
Total other comprehensive loss, net of taxes | (1,652) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,652)
Stock issued to shareholders |  | $ 76,122 | $ 64,181 |  | $ 3,404 |  | $ 3,404 |  | $ 2,321 | $ 1,879 |  | $ 73,801 | $ 62,302 |  |  |
Preferred stock dividends |  |  |  | $ (38) |  |  |  |  |  |  |  |  |  |  | $ (38) |
Common stock dividends declared | (2,186) |  |  |  |  |  |  |  |  |  |  |  |  | (2,186) |  |
Employee Stock Purchase Plan | 84 |  |  |  |  |  |  | 2 |  |  | 82 |  |  |  |  |
Director Stock Purchase Plan | 92 |  |  |  |  |  |  | 3 |  |  | 89 |  |  |  |  |
Restricted stock activity | 187 |  |  |  |  |  |  | 10 |  |  | 177 |  |  |  |  |
Balance at Sep. 30, 2018 | $ 221,835 |  |  |  |  | $ 3,404 |  | $ 8,457 |  |  | $ 177,421 |  |  | $ 36,244 |  | $ (3,691)

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