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Business Combinations - Narrative (Details) - USD ($) |  |  |  | 8 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 15, 2016 | May 16, 2016 | Jan. 01, 2015 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Oct. 01, 2017 | Oct. 01, 2016 | May 17, 2016 | May 15, 2016 | Mar. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 25,222,000 | $ 25,222,000 | $ 25,222,000 |  |  |  |  |  |
Equity Interest in acquiree, percentage |  |  |  |  |  |  |  |  |  | 80.00% |  |
Capital |  |  |  |  |  |  |  |  |  |  |  | $ 371,500,000
Payments to beneficial owner to acquire business |  | $ 16,300,000 |  |  |  |  |  |  |  |  |  |
Goodwill purchase accounting adjustments |  | 20,000 |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of existing membership interest in businesses acquired |  |  | $ 5,000,000 |  | 0 | 5,052,000 | $ 0 |  |  |  |  |
Gain on bargain purchase on businesses acquired |  | $ 65,000 | $ 100,000 |  | $ 0 | 65,000 | $ 0 |  |  |  |  |
Goodwill accumulated impairment |  |  |  |  |  |  |  | $ 0 | $ 0 |  |  |
RiverBanc, RBMI, and RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, cumulative percentage ownership after all transactions |  | 100.00% |  |  |  |  |  |  |  |  |  |
Cash consideration paid for acquisition |  | $ 29,073,000 |  |  |  |  |  |  |  |  |  |
Contingent Consideration |  | (3,800,000) |  |  |  |  |  |  |  |  |  |
Fair value of previously held membership interests |  | 20,608,000 |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  | $ 53,481,000 |  |  |  |  |  |  |  |  |  |
Donlon Family LLC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, cumulative percentage ownership after all transactions |  | 100.00% |  |  |  |  |  |  |  |  |  |
RiverBanc |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 25,222,000 |  |  |  |  |  |  |  |  |  |
Goodwill purchase accounting adjustments | $ 20,000 |  |  |  |  |  |  |  |  |  |  |
Measurement period adjustment, intangible assets |  |  |  | $ (400,000) |  |  |  |  |  |  |  |
RiverBanc |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners prior to acquisition |  |  |  |  |  |  |  |  |  |  | 59.40% |
RiverBanc | RiverBanc, RBMI, and RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest in acquiree, percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |
RBMI |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners prior to acquisition |  |  |  |  |  |  |  |  |  |  | 5.47% |
RBMI | RiverBanc, RBMI, and RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest in acquiree, percentage |  |  |  |  |  |  |  |  |  |  | 67.19% |
RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by noncontrolling owners prior to acquisition |  |  |  |  |  |  |  |  |  |  | 6.25% |
RBDHC | RiverBanc, RBMI, and RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity Interest in acquiree, percentage |  |  |  |  |  |  |  |  |  |  | 62.50% |
RBMI, RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on bargain purchase on businesses acquired |  | $ 100,000 |  |  |  |  |  |  |  |  |  |
Other Income | RiverBanc, RBMI, and RBDHC |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on remeasurement of existing membership interest in businesses acquired |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |

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