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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

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Fair Value Investment Securities Available For Sale [Abstract]

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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