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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance $ 19,082 $ 13,535 $ 3,953
Transfers in (out of) Level 3 1,088 0 0
Total gains or losses (realized/unrealized):      
Included in earnings-fair value adjustment (3,568) (233) 1,360
Additions 63,818 26,399 11,463
Sales and settlements (12,190) (20,619) (3,241)
Ending Balance 68,230 19,082 13,535
Private label residential mortgage-backed securities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 0 2,214
Transfers in (out of) Level 3 0 0 0
Total gains or losses (realized/unrealized):      
Included in earnings-fair value adjustment 0 0 0
Additions 0 0 0
Sales and settlements 0 0 (2,214)
Ending Balance 0 0 0
Mortgage Servicing Rights      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 19,082 13,535 1,739
Transfers in (out of) Level 3 0 0 0
Total gains or losses (realized/unrealized):      
Included in earnings-fair value adjustment (3,568) (233) 1,360
Additions 45,263 26,399 11,463
Sales and settlements (10,838) (20,619) (1,027)
Ending Balance 49,939 19,082 13,535
Loans Repurchased from Ginnie Mae Loan Pools      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]      
Beginning Balance 0 0 0
Transfers in (out of) Level 3 1,088 0 0
Total gains or losses (realized/unrealized):      
Included in earnings-fair value adjustment 0 0 0
Additions 18,555 0 0
Sales and settlements (1,352) 0 0
Ending Balance $ 18,291 $ 0 $ 0