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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, 2018	Dec. 31, 2017	Dec. 31, 2016	Oct. 01, 2017	May 17, 2016	May 15, 2016	Mar. 31, 2016
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			$ 5,000,000		$ 0	$ 0	$ 5,052,000
Goodwill					25,222,000	25,222,000
Goodwill purchase accounting adjustments		$ 20,000
Goodwill accumulated impairment								$ 0
Gain on bargain purchase on businesses acquired		$ (65,000)	$ (100,000)		$ 0	$ 0	(65,000)
Revenue of acquiree since acquisition date				$ 5,300,000
Minimum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life		1 year			6 months
Maximum
Business Acquisition [Line Items]
Finite-lived intangible asset, useful life		10 years			10 years
RiverBanc
Business Acquisition [Line Items]
Ownership percentage by noncontrolling owners prior to acquisition										59.40%
Intangible assets		$ 3,500,000
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%
RBMI, RBDHC
Business Acquisition [Line Items]
Gain on bargain purchase on businesses acquired		$ (100,000)
RiverBanc, RBMI, and RBDHC
Business Acquisition [Line Items]
Equity method investment, cumulative percentage ownership after all transactions		100.00%
Fair value of previously held membership interests		$ 20,608,000
Intangible assets		3,490,000
RiverBanc, RBMI, and RBDHC | Cash Holdback
Business Acquisition [Line Items]
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]
Contingent consideration		$ 800,000
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 | 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		$ 25,222,000
Goodwill purchase accounting adjustments	$ 20,000			20,000
Measurement period adjustment, intangible assets				$ 400,000
Donlon Family LLC
Business Acquisition [Line Items]
Equity method investment, cumulative percentage ownership after all transactions		100.00%

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Fair value at acquisition-date of the equity interest in the acquiree held by the acquirer, immediately before the acquisition date for businesses combined in stages.

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