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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
Mar. 31, 2016
Mar. 31, 2015
Mortgage servicing rights    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period $ 49,939 $ 19,082
Transfers out of Level 3 0 0
Total gains or losses (realized/unrealized):    
Included in earnings—fair value adjustment (8,201) (528)
Additions 8,582 10,192
Sales, settlements, and other (1,950) (7,581)
Balance at end of period 48,370 21,165
Agency mortgage-backed securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of period 18,291 0
Transfers out of Level 3 0 0
Total gains or losses (realized/unrealized):    
Included in earnings—fair value adjustment 47 0
Additions 9,826 0
Sales, settlements, and other (1,584) 0
Balance at end of period $ 26,580 $ 0