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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Total commercial loans held for sale     $ 1,794,207 $ 1,431,810  
Residential mortgage loans at fair value     2,857 3,649  
Total loans held for sale     1,797,064 1,435,459  
Transfer of loans from held for sale to held for investment $ 30,400   30,365 18,826 $ 0
Transfer of loans from held for investment to held for sale   $ 164,700 0 164,681 $ 0
Mortgage warehouse          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Mortgage warehouse loans at fair value     1,754,950 1,332,019  
Multi-family          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Multi-family loans at lower of cost or fair value     $ 39,257 $ 99,791