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Business Combinations (Narrative) (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Business Acquisition [Line Items]        
Acquisition purchase price $ 53,200,000 $ 3,900,000 $ 77,700,000 $ 3,900,000
Specialized Warehouse Lender        
Business Acquisition [Line Items]        
Period of mortgage loan sold description     The mortgage loans are generally sold by the correspondent mortgage lenders to investors within 30 days and more typically in less than 10 days.  
Assets acquired included secured financings receivable from correspondent mortgage lenders 69,600,000   $ 69,600,000  
Liabilities assumed included secured financings payable 69,800,000   69,800,000  
Combined capacity for warehouse lending facilities 123,000,000   123,000,000  
Warehouse lending facilities outstanding borrowings $ 96,200,000   $ 96,200,000  
Maximum | Specialized Warehouse Lender        
Business Acquisition [Line Items]        
Period of mortgage loan sold 10 days      
Minimum | Specialized Warehouse Lender        
Business Acquisition [Line Items]        
Interest rate 3.50%