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Supporting Financial Information - Goodwill and Intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2017
Sep. 30, 2016
Goodwill      
Gross Balance     $ 34,745
Measurement period adjustment $ 9,000 $ 8,756  
Adjusted Gross Balance   25,989  
Intangible Assets      
Measurement period adjustment 9,000    
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward]      
Accumulated amortization   (2,496) (1,058)
Prior period amortization adjustment $ 300 324  
Current period amortization   (1,762)  
Net balance   15,127  
Goodwill and Intangible Assets, Net      
Gross Balance     43,362
Measurement period adjustment   250  
Adjusted Net Balance   43,612  
Net Balance   41,116 42,304
Amortization of intangibles, including prior prior amortization adjustment   $ (1,400)  
Finite-lived intangibles estimated useful lives   10 years  
Estimated amortization expense for future years      
Year 1   $ 1,762  
Year 2   1,762  
Year 3   1,762  
Year 4   1,762  
Year 5   1,762  
Thereafter   6,317  
Net balance   15,127  
Customer Relationships      
Intangible Assets      
Gross Balance     7,247
Measurement period adjustment   9,379  
Adjusted Gross Balance   16,626  
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward]      
Accumulated amortization   (2,355) (993)
Prior period amortization adjustment   300  
Current period amortization   (1,662)  
Net balance   14,271  
Estimated amortization expense for future years      
Net balance   14,271  
Non Compete      
Intangible Assets      
Gross Balance     1,370
Measurement period adjustment   (890)  
Adjusted Gross Balance   480  
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward]      
Accumulated amortization   (68) (65)
Prior period amortization adjustment   45  
Current period amortization   (48)  
Net balance   412  
Estimated amortization expense for future years      
Net balance   412  
Trade Name      
Intangible Assets      
Gross Balance     0
Measurement period adjustment   517  
Adjusted Gross Balance   517  
Movement in Accumulated Amortization, Finite-Lived Intangible Assets [Roll Forward]      
Accumulated amortization   (73) $ 0
Prior period amortization adjustment   (21)  
Current period amortization   (52)  
Net balance   444  
Estimated amortization expense for future years      
Net balance   $ 444