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FAIR VALUES OF FINANCIAL INSTRUMENTS - Reconciliation of Assets Measured at Fair Value on Recurring Basis (Detail) - Mortgage servicing rights - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Balance at beginning of period $ 21,165 $ 8,407 $ 19,082 $ 13,535
Transfers out of Level 3 0 0 0 (9,185)
Total gains or losses (realized/unrealized):        
Included in earnings—realized 0 0 0 0
Included in earnings—fair value adjustment 1,538 (565) 1,010 (250)
Included in other comprehensive income 0 0 0 0
Amortization of premium (discount) 0 0 0 0
Additions 13,699 5,996 23,891 10,322
Sales and settlements (2,204) (4,022) (9,785) (4,606)
Balance at end of period $ 34,198 $ 9,816 $ 34,198 $ 9,816