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Significant Accounting Policies - Schedule of Loan Servicing Rights Recognized (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Servicing Asset at Fair Value, Amount [Roll Forward]    
Beginning balance, mortgage servicing rights $ 244,723 $ 202,982
Mortgage servicing rights recognized 154,040 110,428
Mortgage servicing rights sold (790) (783)
Amortization expense (73,273) (59,608)
Other (4,176) (8,296)
Ending balance, mortgage servicing rights $ 320,524 $ 244,723