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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets:
Investment securities available for sale	$ 2,011,221	$ 1,891,016
Fair Value, Measurements, Recurring [Member]
Assets:
Equity Securities	411	0
Fair Value, Measurements, Recurring [Member] | Other Available For Sale Securities [Member]
Assets:
Investment securities available for sale	500	100
Fair Value, Measurements, Recurring [Member] | Equity Securities [Member]
Assets:
Investment securities available for sale	0	418
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member]
Assets:
Investment securities available for sale	7,426	7,401
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Noncallable
Assets:
Investment securities available for sale	341,720	361,971
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Callable
Assets:
Investment securities available for sale	1,640,064	1,497,253
Fair Value, Measurements, Recurring [Member] | Puerto Rico Government obligations [Member]
Assets:
Investment securities available for sale	6,940	6,813
Fair Value, Measurements, Recurring [Member] | Private label MBS [Member]
Assets:
Investment securities available for sale	14,571	17,060
Fair Value, Measurements, Recurring [Member] | Interest Rate Cap [Member] | Purchase
Assets:
Asset Derivative	815	305
Fair Value, Measurements, Recurring [Member] | Interest Rate Cap [Member] | Written
Derivatives, included in liabilities:
Liability Derivatives	815	305
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member]
Assets:
Asset Derivative	116	7
Derivatives, included in liabilities:
Liability Derivatives	20	19
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member]
Assets:
Equity Securities	411	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Other Available For Sale Securities [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Equity Securities [Member]
Assets:
Investment securities available for sale	0	418
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | U S Treasury Securities [Member]
Assets:
Investment securities available for sale	7,426	7,401
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | US Government Agencies Debt Securities [Member] | Noncallable
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | US Government Agencies Debt Securities [Member] | Callable
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Puerto Rico Government obligations [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Private label MBS [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Purchase
Assets:
Asset Derivative	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Cap [Member] | Written
Derivatives, included in liabilities:
Liability Derivatives	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Forward Contracts [Member]
Assets:
Asset Derivative	0	0
Derivatives, included in liabilities:
Liability Derivatives	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member]
Assets:
Equity Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Other Available For Sale Securities [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Equity Securities [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | U S Treasury Securities [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | US Government Agencies Debt Securities [Member] | Noncallable
Assets:
Investment securities available for sale	341,720	361,971
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | US Government Agencies Debt Securities [Member] | Callable
Assets:
Investment securities available for sale	1,640,064	1,497,253
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Puerto Rico Government obligations [Member]
Assets:
Investment securities available for sale	4,142	4,118
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Private label MBS [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Purchase
Assets:
Asset Derivative	815	305
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Written
Derivatives, included in liabilities:
Liability Derivatives	815	305
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Forward Contracts [Member]
Assets:
Asset Derivative	116	7
Derivatives, included in liabilities:
Liability Derivatives	20	19
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member]
Assets:
Equity Securities	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Other Available For Sale Securities [Member]
Assets:
Investment securities available for sale	500	100
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Equity Securities [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | U S Treasury Securities [Member]
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | US Government Agencies Debt Securities [Member] | Noncallable
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | US Government Agencies Debt Securities [Member] | Callable
Assets:
Investment securities available for sale	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Puerto Rico Government obligations [Member]
Assets:
Investment securities available for sale	2,798	2,695
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label MBS [Member]
Assets:
Investment securities available for sale	14,571	17,060
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Purchase
Assets:
Asset Derivative	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Interest Rate Cap [Member] | Written
Derivatives, included in liabilities:
Liability Derivatives	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Forward Contracts [Member]
Assets:
Asset Derivative	0	0
Derivatives, included in liabilities:
Liability Derivatives	$ 0	$ 0

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