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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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Investment in short-term money-market instruments (such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and so forth) which are highly liquid (that is, readily convertible to known amounts of cash) and so near their maturity that they present an insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify as cash equivalents by definition. Original maturity means an original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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Fair value of financial instruments - Carrying or notional amounts and estimated fair values for financial instruments (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Financial Assets:
Cash and due from banks	$ 535,335	$ 469,501
Money market investments	6,389,437	5,614,595
Debt securities available-for-sale	17,129,858	17,804,374
Debt securities held-to-maturity	8,296,025	8,518,455
Equity securities:
Equity securities, at lower of cost or realizable value	190,688	195,854
Loans held in portfolio	33,318,245	31,357,467
Mortgage servicing rights	119,030	128,350	$ 130,541	$ 121,570
Deposits
Time deposits	8,207,958	6,781,401
Deposits	63,337,600	61,227,227
Assets sold under agreements to repurchase	93,071	148,609
Other short-term borrowings	0	365,000
Notes payable:
Notes payable	1,004,649	886,710
US Treasury Securities
Financial Assets:
Debt securities available-for-sale	11,329,681	11,180,948
Debt securities held-to-maturity	8,228,758	8,453,467
Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	59,745	59,010
Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities available-for-sale	138,014	165,196
Debt securities held-to-maturity	1,562	19
Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,959
Other
Financial Assets:
Debt securities available-for-sale	1,022	1,060
Carrying amount
Financial Assets:
Cash and due from banks	535,335	469,501
Money market investments	6,389,437	5,614,595
Trading account debt securities, excluding derivatives	30,825	27,723
Debt securities available-for-sale	17,129,858	17,804,374
Debt securities held-to-maturity	8,296,025	8,518,455
Equity securities:
FHLB stock	50,358	65,861
FRB stock	99,064	96,206
Other investments	41,266	33,787
Equity securities, at lower of cost or realizable value	190,688	195,854
Loans held-for-sale	5,239	5,381
Loans held in portfolio	33,318,245	31,357,467
Mortgage servicing rights	119,030	128,350
Derivatives	23,511	19,229
Deposits
Demand deposits	55,129,643	54,445,825
Time deposits	8,207,957	6,781,402
Deposits	63,337,600	61,227,227
Assets sold under agreements to repurchase	93,071	148,609
Other short-term borrowings		365,000
Notes payable:
FHLB advances	412,632	389,282
Unsecured senior debt securities	393,678	299,109
Junior subordinated deferrable interest debentures (related to trust preferred securities)	198,339	198,319
Notes payable	1,004,649	886,710
Derivatives	21,747	17,000
Carrying amount \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	8,228,758	8,453,467
Carrying amount \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	59,745	59,010
Carrying amount \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	1,562	19
Carrying amount \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,959
Fair Value
Financial Assets:
Cash and due from banks	535,335	469,501
Money market investments	6,389,437	5,614,595
Trading account debt securities, excluding derivatives	30,825	27,723
Debt securities available-for-sale	17,129,858	17,804,374
Debt securities held-to-maturity	8,065,067	8,440,196
Equity securities:
FHLB stock	50,358	65,861
FRB stock	99,064	96,206
Other investments	42,183	34,598
Equity securities, at lower of cost or realizable value	191,605	196,665
Loans held-for-sale	5,239	5,404
Loans held in portfolio	31,646,073	29,366,365
Mortgage servicing rights	119,030	128,350
Derivatives	23,511	19,229
Deposits
Demand deposits	55,129,643	54,445,825
Time deposits	7,835,985	6,464,943
Deposits	62,965,628	60,910,768
Assets sold under agreements to repurchase	93,050	148,566
Other short-term borrowings		365,000
Notes payable:
FHLB advances	388,483	361,951
Unsecured senior debt securities	402,324	300,027
Junior subordinated deferrable interest debentures (related to trust preferred securities)	180,183	173,938
Notes payable	970,990	835,916
Derivatives	21,747	17,000
Fair Value \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	7,999,065	8,372,601
Fair Value \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	58,731	61,617
Fair Value \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	1,311	19
Fair Value \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,959
Fair Value \| Level 1
Financial Assets:
Cash and due from banks	535,335	469,501
Money market investments	6,383,534	5,607,937
Trading account debt securities, excluding derivatives	15,644	13,069
Debt securities available-for-sale	3,871,643	1,908,589
Debt securities held-to-maturity	0	0
Equity securities:
FHLB stock	0	0
FRB stock	0	0
Other investments	0	0
Equity securities, at lower of cost or realizable value	0	0
Loans held-for-sale	0	0
Loans held in portfolio	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Deposits
Demand deposits	0	0
Time deposits	0	0
Deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings		0
Notes payable:
FHLB advances	0	0
Unsecured senior debt securities	0	0
Junior subordinated deferrable interest debentures (related to trust preferred securities)	0	0
Notes payable	0	0
Derivatives	0	0
Fair Value \| Level 1 \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 1 \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 1 \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 1 \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 2
Financial Assets:
Cash and due from banks	0	0
Money market investments	5,903	6,658
Trading account debt securities, excluding derivatives	14,846	14,119
Debt securities available-for-sale	13,256,562	15,894,074
Debt securities held-to-maturity	8,013,187	8,378,560
Equity securities:
FHLB stock	50,358	65,861
FRB stock	99,064	96,206
Other investments	35,026	29,302
Equity securities, at lower of cost or realizable value	184,448	191,369
Loans held-for-sale	5,239	0
Loans held in portfolio	0	0
Mortgage servicing rights	0	0
Derivatives	23,511	19,229
Deposits
Demand deposits	55,129,643	54,445,825
Time deposits	7,835,985	6,464,943
Deposits	62,965,628	60,910,768
Assets sold under agreements to repurchase	93,050	148,566
Other short-term borrowings		365,000
Notes payable:
FHLB advances	388,483	361,951
Unsecured senior debt securities	402,324	300,027
Junior subordinated deferrable interest debentures (related to trust preferred securities)	180,183	173,938
Notes payable	970,990	835,916
Derivatives	21,747	17,000
Fair Value \| Level 2 \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	7,999,065	8,372,601
Fair Value \| Level 2 \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	6,866	0
Fair Value \| Level 2 \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	1,296	0
Fair Value \| Level 2 \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	5,960	5,959
Fair Value \| Level 3
Financial Assets:
Cash and due from banks	0	0
Money market investments	0	0
Trading account debt securities, excluding derivatives	335	535
Debt securities available-for-sale	1,653	1,711
Debt securities held-to-maturity	51,880	61,636
Equity securities:
FHLB stock	0	0
FRB stock	0	0
Other investments	6,871	4,966
Equity securities, at lower of cost or realizable value	6,871	4,966
Loans held-for-sale	0	5,404
Loans held in portfolio	31,646,073	29,366,365
Mortgage servicing rights	119,030	128,350
Derivatives	0	0
Deposits
Demand deposits	0	0
Time deposits	0	0
Deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings		0
Notes payable:
FHLB advances	0	0
Unsecured senior debt securities	0	0
Junior subordinated deferrable interest debentures (related to trust preferred securities)	0	0
Notes payable	0	0
Derivatives	0	0
Fair Value \| Level 3 \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| Level 3 \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	51,865	61,617
Fair Value \| Level 3 \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	15	19
Fair Value \| Level 3 \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV
Financial Assets:
Cash and due from banks	0	0
Money market investments	0	0
Trading account debt securities, excluding derivatives	0	0
Debt securities available-for-sale	0	0
Debt securities held-to-maturity	0	0
Equity securities:
FHLB stock	0	0
FRB stock	0	0
Other investments	286	330
Equity securities, at lower of cost or realizable value	286	330
Loans held-for-sale	0	0
Loans held in portfolio	0	0
Mortgage servicing rights	0	0
Derivatives	0	0
Deposits
Demand deposits	0	0
Time deposits	0	0
Deposits	0	0
Assets sold under agreements to repurchase	0	0
Other short-term borrowings		0
Notes payable:
FHLB advances	0	0
Unsecured senior debt securities	0	0
Junior subordinated deferrable interest debentures (related to trust preferred securities)	0	0
Notes payable	0	0
Derivatives	0	0
Fair Value \| NAV \| US Treasury Securities
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV \| Obligations of Puerto Rico, States and political subdivisions
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV \| Collateralized Mortgage Obligations - Federal agencies
Financial Assets:
Debt securities held-to-maturity	0	0
Fair Value \| NAV \| Securities in wholly owned statutory business trusts
Financial Assets:
Debt securities held-to-maturity	$ 0	$ 0