LOANS (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 6,702,661	$ 6,402,586
Troubled debt restructurings	173,427	150,426
Loan deferral amount, pandemic related	9,700	28,000
Recorded investment of residential mortgage loans collateralized and in process of foreclosure	14,900	16,900
Balance of revolving loans converted to term loans, amount	70,100	37,500
Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,419,796	4,995,631
Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	149,996	125,887
Mortgage Loans - GNMA Buy-Back Option Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Delinquent loans	33,400	14,500
Past due \| Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	199,224	185,137
Commercial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,595,867	2,379,330
Troubled debt restructurings	55,158	35,839
Commitment to lend additional funds	2,700	3,700
Commercial loans \| Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,421,585	2,174,995
Commercial loans \| Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	40,722	20,922
Commercial loans \| Puerto Rico \| Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	86,300	87,300
Commercial loans \| Puerto Rico \| Government \| Property Tax Revenue
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	86,300	86,200
Commercial loans \| Puerto Rico \| Government \| Public Corporation \| Nonperforming
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,100
Commercial loans \| Past due \| Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,244	14,128
Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,807,852	1,907,271
Troubled debt restructurings	115,639	110,962
Mortgage \| Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	708,755	718,848
Mortgage \| Government Guaranteed Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	47,700	40,800
Mortgage \| Accruing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Troubled debt restructurings	106,658	101,487
Mortgage \| Past due \| Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	69,606	$ 60,027
Mortgage \| Past due \| Residential mortgage loans \| Non-PCD
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sales of loans held for sale	$ 21,900

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This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days.

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Amount of financing receivable modified as troubled debt restructuring.

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Amortized cost of revolving financing receivable converted to term loan.

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

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