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Business Combinations - Narrative (Details) |  |  |  |  | 8 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 01, 2016 USD ($) | Jul. 15, 2016 USD ($) | Jun. 10, 2016 USD ($) | May 16, 2016 USD ($) component | Dec. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($) | May 17, 2016 | May 15, 2016 | Mar. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, percentage |  |  |  |  |  |  |  |  | 80.00% |  |
Capital |  |  |  |  |  |  |  |  |  |  | $ 371,500,000
Gain on remeasurement of existing membership interest in businesses acquired |  |  |  |  |  | $ 0 | $ 5,052,000 |  |  |  |
Goodwill |  |  |  |  | $ 25,222,000 | 25,222,000 |  | $ 25,222,000 |  |  |
Goodwill impairment | $ 0 |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase on businesses acquired |  |  |  |  |  | $ 0 | $ 65,000 |  |  |  |
Revenue of acquiree since acquisition date |  |  |  |  |  |  |  | 5,300,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 6 months |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  | 10 years |  |  |  |  |
RiverBanc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners prior to acquisition |  |  |  |  |  |  |  |  |  | 59.40% |
RBMI |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners prior to acquisition |  |  |  |  |  |  |  |  |  | 5.47% |
RBDHC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners prior to acquisition |  |  |  |  |  |  |  |  |  | 6.25% |
RiverBanc, RBMI, and RBDHC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Subsidiary cumulative percentage ownership after all transactions |  |  |  | 100.00% |  |  |  |  |  |  |
Total consideration transferred |  |  |  | $ 53,481,000 |  |  |  |  |  |  |
Fair value of previously held membership interests |  |  |  | $ 20,608,000 |  |  |  |  |  |  |
Contingent consideration, number of components | component |  |  |  | 2 |  |  |  |  |  |  |
Payments for previous acquisition |  | $ 20,000 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | $ 3,490,000 |  |  |  |  |  |  |
RiverBanc, RBMI, and RBDHC | Other Income |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of existing membership interest in businesses acquired |  |  |  |  |  |  |  | 5,000,000 |  |  |
RiverBanc, RBMI, and RBDHC | Cash Holdback |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for previous acquisition |  |  | $ 3,000,000 |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | 3,000,000 |  |  |  |  |  |  |
Reimbursement to previous beneficial owner for purchase of company shares |  |  |  | $ 3,000,000 |  |  |  |  |  |  |
Contingent consideration term |  |  |  | 90 days |  |  |  |  |  |  |
RiverBanc, RBMI, and RBDHC | Severance Holdback |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for previous acquisition |  | 800,000 |  |  |  |  |  |  |  |  |
Contingent consideration |  |  |  | $ 800,000 |  |  |  |  |  |  |
RiverBanc, RBMI, and RBDHC | RiverBanc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, percentage |  |  |  |  |  |  |  |  |  | 20.00% |
RiverBanc, RBMI, and RBDHC | RBMI |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, percentage |  |  |  |  |  |  |  |  |  | 67.19% |
RiverBanc, RBMI, and RBDHC | RBDHC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity interest in acquiree, percentage |  |  |  |  |  |  |  |  |  | 62.50% |
RiverBanc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill purchase accounting adjustments |  | $ 20,000 |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  | 3,500,000 |  |  |  |  |  |  |
Goodwill |  |  |  | $ 25,222,000 |  |  |  |  |  |  |
Measurement period adjustment in intangible assets |  |  |  |  | $ 400,000 |  |  |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |  |  |  |  |  |
RiverBanc | Minimum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  | 1 year |  |  |  |  |  |  |
RiverBanc | Maximum |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  | 10 years |  |  |  |  |  |  |
RBMI, RBDHC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase on businesses acquired |  |  |  | $ 65,000 |  |  |  | $ 100,000 |  |  |

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