Quarterly report pursuant to Section 13 or 15(d)

Acquisition - Additional Information (Detail)

v3.10.0.1
Acquisition - Additional Information (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Acquisition
Jun. 30, 2018
USD ($)
Segment
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Jan. 01, 2017
USD ($)
Business Acquisition [Line Items]          
Contingent consideration $ 1,700 $ 1,700      
Cash consideration $ 6,216 6,216 $ 0    
Number of acquisition | Acquisition 2        
Mortgage servicing assets, net $ 2,000 2,000      
Mortgage servicing assets 2,100 2,100      
Mortgage servicing liabilities 100 100      
Fair values of intangible assets 1,541 1,541 $ 0 $ 0 $ 0
Acquired working capital 100 100      
Goodwill $ 4,186 $ 4,186   $ 0  
Number of reporting units | Segment   1      
Cash payment related to contingent consideration   $ 0      
Minimum [Member]          
Business Acquisition [Line Items]          
Contingent consideration period 3 years        
Maximum [Member]          
Business Acquisition [Line Items]          
Contingent consideration period 5 years