FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	$ 1,881,920	$ 1,886,395
Derivatives, included in assets:
Derivatives, included in assets	554	806
Derivatives, included in liabilities:
Derivatives, included in liabilities	753	921
Forward Contracts [Member]
Derivatives, included in liabilities:
Derivatives, included in liabilities	201	123
Equity Securities [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	408	0
U S Treasury Securities [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	7,509	7,497
Us Government Agencies Debt Securities Noncallable [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	356,919	315,467
Us Government Agencies Debt Securities Callable [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	1,469,463	1,509,807
Puerto Rico Government Obligations [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	26,828	28,217
Private Label Mbs [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	20,693	25,307
Interest Rate Cap [Member] | Purchase
Derivatives, included in assets:
Derivatives, included in assets	554	806
Interest Rate Cap [Member] | Written
Derivatives, included in liabilities:
Derivatives, included in liabilities	552	798
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	408	0
Fair Value Inputs Level 1 [Member] | U S Treasury Securities [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	7,509	7,497
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] | 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	201	123
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	356,919	315,467
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	1,469,463	1,509,807
Fair Value Inputs Level 2 [Member] | Puerto Rico Government Obligations [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	24,707	26,327
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	554	806
Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Written
Derivatives, included in liabilities:
Derivatives, included in liabilities	552	798
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	2,121	1,890
Fair Value Inputs Level 3 [Member] | Private Label Mbs [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	20,693	25,307
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] | Other Available For Sale Securities [Member]
Fair Value Investment Securities Available For Sale [Abstract]
Investment securities available for sale	$ 100	$ 100