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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Mortgage servicing rights        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 48,370 $ 21,165 $ 49,939 $ 19,082
Total gains or losses (realized/unrealized):        
Included in earnings—fair value adjustment (5,831) 1,538 (14,032) 1,010
Additions 12,766 13,699 21,348 23,891
Sales, paydowns, and other (2,738) (2,204) (4,688) (9,785)
Balance at end of period 52,567 34,198 52,567 34,198
Agency mortgage-backed securities        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period 26,580 0 18,291 0
Total gains or losses (realized/unrealized):        
Included in earnings—fair value adjustment 95 0 142 0
Additions 11,277 0 21,103 0
Sales, paydowns, and other (3,701) 0 (5,285) 0
Balance at end of period $ 34,251 $ 0 $ 34,251 $ 0