Quarterly report pursuant to Section 13 or 15(d)

Acquisitions, Goodwill and Intangible Assets - Additional Information (Detail)

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Acquisitions, Goodwill and Intangible Assets - Additional Information (Detail)
$ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
Acquisition
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]      
Contingent consideration $ 1,700    
Cash consideration $ 6,990 $ 0  
Earn-out period for contingent consideration 5 years    
Number of acquisitions | Acquisition 3    
Mortgage servicing assets, net $ 2,000    
Mortgage servicing assets 2,100    
Mortgage servicing liabilities 100    
Fair values of intangible assets 1,571   $ 0
Acquired working capital 100    
Goodwill 4,186   $ 0
Other assets noncurrent $ 800