FAIR VALUE (Tables)	12 Months Ended
FAIR VALUE (Tables)	Dec. 31, 2022
FAIR VALUE [Abstract]
Assets and Liabilities Measured at Fair Value on Recurring Basis [Table Text Block]	Assets and liabilities measured at fair value on a recurring basis are summarized below as of December 31, 2022 and 2021: As of December 31, 2022 As of December 31, 2021 Fair Value Measurements Using Fair Value Measurements Using Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total (In thousands) Assets: Debt securities available for sale: U.S. Treasury securities $ 138,875 $ - $ - $ 138,875 $ 148,486 $ - $ - $ 148,486 Noncallable U.S. agencies debt securities - 389,787 - 389,787 - 285,028 - 285,028 Callable U.S. agencies debt securities - 1,963,566 - 1,963,566 - 1,971,954 - 1,971,954 MBS - 3,098,797 5,794 (1) 3,104,591 - 4,037,209 7,234 (1) 4,044,443 Puerto Rico government obligations - - 2,201 2,201 - - 2,850 2,850 Other investments - - 500 500 - - 1,000 1,000 Equity securities 4,861 - - 4,861 5,378 - - 5,378 Derivative assets - 633 - 633 - 1,505 - 1,505 Liabilities: Derivative liabilities - 476 - 476 - 1,178 - 1,178 (1) Related to private label MBS.
Fair Value Measurement Inputs and Valuation Techniques [Table Text Block]	The tables below present quantitative information for significant assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of December 31, 2022 and 2021: December 31, 2022 Fair Value Valuation Technique Unobservable Input Range Weighted Average Minimum Maximum (Dollars in thousands) Available-for-sale debt securities: Private label MBS $ 5,794 Discounted cash flows Discount rate 16.2% 16.2% 16.2% Prepayment rate 1.5% 15.2% 11.8% Projected cumulative loss rate 0.3% 15.6% 5.6% Puerto Rico government obligations $ 2,201 Discounted cash flows Discount rate 12.9% 12.9% 12.9% Projected cumulative loss rate 19.3% 19.3% 19.3% December 31, 2021 Fair Value Valuation Technique Unobservable Input Range Weighted Average Minimum Maximum (Dollars in thousands) Available-for-sale debt securities: Private label MBS $ 7,234 Discounted cash flows Discount rate 12.9% 12.9% 12.9% Prepayment rate 7.6% 24.9% 15.2% Projected cumulative loss rate 0.2% 15.7% 7.6% Puerto Rico government obligations $ 2,850 Discounted cash flows Discount rate 6.6% 8.4% 7.9% Projected cumulative loss rate 8.6% 8.6% 8.6%
Impairment or Valuation Adjustments were Recorded for Assets Recognized at Fair Value [Table Text Block]	As of December 31, 2022, the Corporation recorded losses or valuation adjustments for assets recognized at fair value on a non- recurring basis and still held at December 31, 2022, as shown in the following table: Carrying value as of December 31, Related to losses recorded for the Year Ended December 31, 2022 2021 2020 2022 2021 2020 (In thousands) Level 3: Loans receivable (1) $ 11,437 $ 31,534 $ 74,197 $ (736) $ (5,466) $ (13,737) OREO (2) 5,461 9,126 50,248 (917) (48) (1,837) Premises and equipment (3) 1,242 - - (218) - - Level 2: Loans held for sale $ 12,306 $ - $ - $ (106) $ - $ - (1) Consists mainly of collateral dependent commercial and construction loans. The Corporation generally measured losses based on the fair value of the collateral. The Corporation derived the fair values from external appraisals that took into consideration prices in observed transactions involving similar assets in similar locations but adjusted for specific characteristics and assumptions of the collateral (e.g., absorption rates), which are not market observable. (2) The Corporation derived the fair values from appraisals that took into consideration prices in observed transactions involving similar assets in similar locations but adjusted for specific characteristics and assumptions of the properties (e.g., absorption rates and net operating income of income producing properties), which are not market observable. Losses were related to market valuation adjustments after the transfer of the loans to the OREO portfolio. (3) Relates to a banking facility reclassified to held-for-sale and measured at the fair value of the collateral.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques [Table Text Block]	Qualitative information regarding the fair value measurements for Level 3 financial instruments as of December 31, 2022 are as follows: December 31, 2022 Method Inputs Loans Income, Market, Comparable Sales, Discounted Cash Flows External appraised values; probability weighting of broker price opinions; management assumptions regarding market trends or other relevant factors OREO Income, Market, Comparable Sales, Discounted Cash Flows External appraised values; probability weighting of broker price opinions; management assumptions regarding market trends or other relevant factors Premises and equipment Market External appraised value
Estimated Fair Value and Carrying Value of Financial Instruments [Table Text Block]	The following tables present the carrying value, estimated fair value and estimated fair value level of the hierarchy of financial instruments as of December 31, 2022 and 2021: Total Carrying Amount in Statement of Financial Condition as of December 31, 2022 Fair Value Estimate as of December 31, 2022 Level 1 Level 2 Level 3 (In thousands) Assets: Cash and due from banks and money market investments (amortized cost) $ 480,505 $ 480,505 $ 480,505 $ - $ - Available-for-sale debt securities (fair value) 5,599,520 5,599,520 138,875 5,452,150 8,495 Held-to-maturity debt securities (amortized cost) 437,537 Less: ACL on held-to-maturity debt securities (8,286) Held-to-maturity debt securities, net of ACL $ 429,251 427,115 - 260,106 167,009 Equity securities (amortized cost) 50,428 50,428 - 50,428 (1) - Other equity securities (fair value) 4,861 4,861 4,861 - - Loans held for sale (lower of cost or market) 12,306 12,306 - 12,306 - Loans held for investment (amortized cost) 11,552,825 Less: ACL for loans and finance leases (260,464) Loans held for investment, net of ACL $ 11,292,361 11,106,809 - - 11,106,809 MSRs (amortized cost) 29,037 44,710 - - 44,710 Derivative assets (fair value) (2) 633 633 - 633 - Liabilities: Deposits (amortized cost) $ 16,143,467 $ 16,139,937 $ - $ 16,139,937 $ - Securities sold under agreements to repurchase (amortized cost) 75,133 75,230 - 75,230 - Advances from FHLB (amortized cost) 675,000 674,596 - 674,596 - Other borrowings (amortized cost) 183,762 187,246 - - 187,246 Derivative liabilities (fair value) (2) 476 476 - 476 - (1) Includes FHLB stock with a carrying value of $ 42.9 million, which are considered restricted. (2) Includes interest rate swap agreements, interest rate caps, forward contracts, interest rate lock commitments, and forward loan sales commitments. Total Carrying Amount in Statement of Financial Condition as of December 31, 2021 Fair Value Estimate as of December 31, 2021 Level 1 Level 2 Level 3 (In thousands) Assets: Cash and due from banks and money market investments (amortized cost) $ 2,543,058 $ 2,543,058 $ 2,543,058 $ - $ - Available-for-sale debt securities (fair value) 6,453,761 6,453,761 148,486 6,294,191 11,084 Held-to-maturity debt securities (amortized cost) 178,133 Less: ACL on held-to-maturity debt securities (8,571) Held-to-maturity debt securities, net of ACL $ 169,562 167,147 - - 167,147 Equity securities (amortized cost) 26,791 26,791 - 26,791 (1) - Other equity securities (fair value) 5,378 5,378 5,378 - - Loans held for sale (lower of cost or market) 35,155 36,147 - 36,147 - Loans held for investment (amortized cost) 11,060,658 Less: ACL for loans and finance leases (269,030) Loans held for investment, net of ACL $ 10,791,628 10,900,400 - - 10,900,400 MSRs (amortized cost) 30,986 42,132 - - 42,132 Derivative assets (fair value) (2) 1,505 1,505 - 1,505 - Liabilities: Deposits (amortized cost) $ 17,784,894 $ 17,800,706 $ - $ 17,800,706 $ - Securities sold under agreements to repurchase (amortized cost) 300,000 322,105 - 322,105 - Advances from FHLB (amortized cost) 200,000 202,044 - 202,044 - Other borrowings (amortized cost) 183,762 177,689 - - 177,689 Derivative liabilities (fair value) (2) 1,178 1,178 - 1,178 - '(1) Includes FHLB stock with a carrying value of $ 21.5 million, which are considered restricted. (2) Includes interest rate swap agreements, interest rate caps, forward contracts, interest rate lock commitments, and forward loan sales commitments.
Fair Value of Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The table below presents a reconciliation of the beginning and ending balances of all assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the years ended December 31, 2022, 2021, and 2020: 2022 2021 2020 Level 3 Instruments Only Securities Available for Sale (1) Securities Available for Sale (1) Securities Available for Sale (1) (In thousands) Beginning balance $ 11,084 $ 11,977 $ 14,590 Total gains (losses): Included in other comprehensive income (unrealized) (401) 1,281 2,403 Included in earnings (unrealized) (2) 434 136 (1,641) BSPR securities acquired - - 150 Purchases - 1,000 - Principal repayments and amortization (2,622) (3,310) (3,525) Ending balance $ 8,495 $ 11,084 $ 11,977 ___________________ (1) Amounts mostly related to private label MBS. (2) Changes in unrealized gains included in earnings were recognized within provision for credit losses - expense (benefit) and relate to assets still held as of the reporting date.