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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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