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Mortgage Banking Activities - Principal Balance of Mortgage Servicing Rights (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Mortgage loan portfolios serviced for:    
Mortgage loans serviced for others $ 1,200,000 $ 1,100,000
FHLMC [Member]    
Mortgage loan portfolios serviced for:    
Mortgage loans serviced for others 941,865 878,300
FNMA [Member]    
Mortgage loan portfolios serviced for:    
Mortgage loans serviced for others $ 214,849 $ 233,026