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FAIR VALUE - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets: |  |
Investment securities available for sale | $ 6,689,479 | $ 4,647,019
Fair Value, Measurements, Recurring [Member] |  |
Assets: |  |
Equity Securities | 5,436 | 1,474
Fair Value, Measurements, Recurring [Member] | Interest Rate Swap [Member] |  |
Assets: |  |
Asset Derivative | 1,218 | 1,622
Derivatives, included in liabilities: |  |
Liability Derivatives | 1,213 | 1,639
Fair Value, Measurements, Recurring [Member] | Other Available For Sale Securities [Member] |  |
Assets: |  |
Investment securities available for sale | 1,000 | 650
Fair Value, Measurements, Recurring [Member] | U S Treasury Securities [Member] |  |
Assets: |  |
Investment securities available for sale | 87,887 | 7,507
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Noncallable |  |
Assets: |  |
Investment securities available for sale | 278,795 | 173,371
Fair Value, Measurements, Recurring [Member] | US Government Agencies Debt Securities [Member] | Callable |  |
Assets: |  |
Investment securities available for sale | 6,311,329 | 4,454,164
Fair Value, Measurements, Recurring [Member] | Puerto Rico Government obligations [Member] |  |
Assets: |  |
Investment securities available for sale | 2,894 | 2,899
Fair Value, Measurements, Recurring [Member] | Private label [Member] |  |
Assets: |  |
Investment securities available for sale | 7,574 | 8,428
Fair Value, Measurements, Recurring [Member] | Interest Rate Cap [Member] | Purchase |  |
Assets: |  |
Asset Derivative | 3 | 1
Fair Value, Measurements, Recurring [Member] | Interest Rate Cap [Member] | Written |  |
Derivatives, included in liabilities: |  |
Liability Derivatives | 3 | 1
Fair Value, Measurements, Recurring [Member] | Interest Rate Lock Commitments [Member] |  |
Assets: |  |
Asset Derivative | 485 | 737
Fair Value, Measurements, Recurring [Member] | Forward loan sales commitments [Member] |  |
Assets: |  |
Asset Derivative | 20 | 20
Fair Value, Measurements, Recurring [Member] | Forward Contracts [Member] |  |
Assets: |  |
Asset Derivative | 44 | 102
Derivatives, included in liabilities: |  |
Liability Derivatives | 11 | 280
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] |  |
Assets: |  |
Equity Securities | 5,436 | 1,474
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Interest Rate Swap [Member] |  |
Assets: |  |
Asset Derivative | 0 | 0
Derivatives, included in liabilities: |  |
Liability Derivatives | 0 | 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] | U S Treasury Securities [Member] |  |
Assets: |  |
Investment securities available for sale | 87,887 | 7,507
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 [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] | Interest Rate Lock Commitments [Member] |  |
Assets: |  |
Asset Derivative | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 1 [Member] | Forward loan sales commitments [Member] |  |
Assets: |  |
Asset Derivative | 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] | Interest Rate Swap [Member] |  |
Assets: |  |
Asset Derivative | 1,218 | 1,622
Derivatives, included in liabilities: |  |
Liability Derivatives | 1,213 | 1,639
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] | 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 | 278,795 | 173,371
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | US Government Agencies Debt Securities [Member] | Callable |  |
Assets: |  |
Investment securities available for sale | 6,311,329 | 4,454,164
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Puerto Rico Government obligations [Member] |  |
Assets: |  |
Investment securities available for sale | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Private label [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 | 3 | 1
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Cap [Member] | Written |  |
Derivatives, included in liabilities: |  |
Liability Derivatives | 3 | 1
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Interest Rate Lock Commitments [Member] |  |
Assets: |  |
Asset Derivative | 485 | 737
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Forward loan sales commitments [Member] |  |
Assets: |  |
Asset Derivative | 20 | 20
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 2 [Member] | Forward Contracts [Member] |  |
Assets: |  |
Asset Derivative | 44 | 102
Derivatives, included in liabilities: |  |
Liability Derivatives | 11 | 280
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] | Interest Rate Swap [Member] |  |
Assets: |  |
Asset Derivative | 0 | 0
Derivatives, included in liabilities: |  |
Liability Derivatives | 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 | 1,000 | 650
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 | 2,894 | 2,899
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Private label [Member] |  |
Assets: |  |
Investment securities available for sale | 7,574 | 8,428
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] | Interest Rate Lock Commitments [Member] |  |
Assets: |  |
Asset Derivative | 0 | 0
Fair Value, Measurements, Recurring [Member] | Fair Value Inputs Level 3 [Member] | Forward loan sales commitments [Member] |  |
Assets: |  |
Asset Derivative | 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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