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Capital Stock (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
May 30, 2017 | Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Number of shares issued as partial consideration for acquisition of Cascade Bancorp | 11,300,000 |  |  |
Payment amount for repurchase of common stock |  | $ 0.9 | $ 0.9 |
Class A Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock outstanding (in shares) |  | 34,067,912 |  | 33,560,202
Stock repurchased and retired (in shares) |  | 0 |  |
Class B Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock outstanding (in shares) |  | 22,631,503 |  | 22,905,357

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