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Goodwill and Intangible Assets Acquisitions (Details) - USD ($) shares in Millions, $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2018 | May 01, 2018 | Dec. 31, 2019
CoBiz Financial Inc. [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Effective Date of Acquisition | Oct. 01, 2018 |  |
Name of Acquired Entity |  |  | CoBiz Financial, Inc. ("CoBiz")
Consideration Transferred |  |  | $ 944.0
Cash payments to acquire businesses |  |  | $ 243.0
Stock Issued During Period, Shares, Acquisitions |  |  | 7.2
Equity interests issued |  |  | $ 701.0
Goodwill Recognized, Description |  |  | synergies expected to be gained through consolidation of administrative functions resulting in cost savings.
Switchgrass Holdings LLC [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Effective Date of Acquisition |  | May 01, 2018 |
Name of Acquired Entity |  |  | Switchgrass Holdings, LLC
Cash payments to acquire businesses |  |  | $ 14.0
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract] |  |  |
Intangible assets |  |  | $ 6.7

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