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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale $ 1,891,016 $ 1,881,920
Derivatives, included in assets:    
Derivatives, included in assets 312 554
Derivatives, included in liabilities:    
Derivatives, included in liabilities 324 753
Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 19 201
Equity Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 418 408
U S Treasury Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 7,401 7,509
Us Government Agencies Debt Securities Noncallable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 361,971 356,919
Us Government Agencies Debt Securities Callable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 1,497,253 1,469,463
Puerto Rico Government Obligations [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 6,813 26,828
Private Label Mbs [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 17,060 20,693
Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 305 554
Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 305 552
Forward And Future Contracts [Member] | Forward Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 7 0
Other Available For Sale Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 100 100
Fair Value Inputs Level 1 [Member] | Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 1 [Member] | Equity Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 418 408
Fair Value Inputs Level 1 [Member] | U S Treasury Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 7,401 7,509
Fair Value Inputs Level 1 [Member] | Us Government Agencies Debt Securities Noncallable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Us Government Agencies Debt Securities Callable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Puerto Rico Government Obligations [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Private Label Mbs [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 1 [Member] | Forward And Future Contracts [Member] | Forward Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 1 [Member] | Other Available For Sale Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 19 201
Fair Value Inputs Level 2 [Member] | Equity Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | U S Treasury Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | Us Government Agencies Debt Securities Noncallable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 361,971 356,919
Fair Value Inputs Level 2 [Member] | Us Government Agencies Debt Securities Callable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 1,497,253 1,469,463
Fair Value Inputs Level 2 [Member] | Puerto Rico Government Obligations [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 4,118 24,707
Fair Value Inputs Level 2 [Member] | Private Label Mbs [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 305 554
Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 305 552
Fair Value Inputs Level 2 [Member] | Forward And Future Contracts [Member] | Forward Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 7 0
Fair Value Inputs Level 2 [Member] | Other Available For Sale Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | Forward Contracts [Member]    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 3 [Member] | Equity Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | U S Treasury Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | Us Government Agencies Debt Securities Noncallable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | Us Government Agencies Debt Securities Callable [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 0 0
Fair Value Inputs Level 3 [Member] | Puerto Rico Government Obligations [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 2,695 2,121
Fair Value Inputs Level 3 [Member] | Private Label Mbs [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale 17,060 20,693
Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Purchase    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Written    
Derivatives, included in liabilities:    
Derivatives, included in liabilities 0 0
Fair Value Inputs Level 3 [Member] | Forward And Future Contracts [Member] | Forward Contracts [Member]    
Derivatives, included in assets:    
Derivatives, included in assets 0 0
Fair Value Inputs Level 3 [Member] | Other Available For Sale Securities [Member]    
Fair Value Investment Securities Available For Sale [Abstract]    
Investment securities available for sale $ 100 $ 100