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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Effect of Derivative Instruments on Statement of Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments Gain Loss [Line Items]        
Interest Income Loans $ (139,205) $ (134,593) $ (409,918) $ (398,732)
Mortgage banking activities 4,551 3,117 13,551 11,579
Not Designated as Hedging Instrument, Economic Hedge [Member]        
Economic undesignated hedges:        
Total gain (loss) on derivatives 211 (35) 108 272
Not Designated as Hedging Instrument, Economic Hedge [Member] | Forward Contracts [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mortgage banking activities 0 0 0 0
Not Designated as Hedging Instrument, Economic Hedge [Member] | Loan Origination Commitments [Member]        
Derivative Instruments Gain Loss [Line Items]        
Mortgage banking activities 211 34 108 274
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Rate Cap [Member]        
Derivative Instruments Gain Loss [Line Items]        
Interest Income Loans $ 0 $ (1) $ 0 $ (2)