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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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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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