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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, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Carrying amount |  |  |  |
Financial Assets: |  |  |  |
Cash and due from banks | $ 565,202 | $ 388,311 |  |
Money market investments | 11,859,924 | 3,262,286 |  |
Trading account debt securities, excluding derivatives | 33,053 | 40,321 |  |
Debt Securities Available for Sale, at Fair Value | 21,177,839 | 17,648,473 |  |
Debt securities held-to-maturity, net | 80,742 | 97,662 |  |
Equity securities: |  |  |  |
FHLB Stock | 53,252 | 43,787 |  |
FRB stock | 92,721 | 93,470 |  |
Other investments | 28,020 | 22,630 |  |
Equity securities | 173,993 | 159,887 |  |
Loans held-for-sale | 102,760 | 59,203 |  |
Loans held in portfolio, net | 28,466,660 | 26,929,165 |  |
Mortgage servicing rights | 123,552 | 150,906 |  |
Derivatives | 18,080 | 17,966 |  |
Deposits |  |  |  |
Demand deposits | 48,177,054 | 36,083,809 |  |
Time deposits | 7,844,929 | 7,674,797 |  |
Total deposits | 56,021,983 | 43,758,606 |  |
Assets sold under agreements to repurchase | 106,028 | 193,378 |  |
Other short-term borrowings | 100,000 |  |  |
Notes payable: |  |  |  |
Advances with the FHLB | 519,208 | 421,399 |  |
Unsecured senior debt securities | 296,257 | 295,307 |  |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust | 384,922 | 384,902 |  |
FRB advances | 1,009 |  |  |
Notes Payable | 1,201,396 | 1,101,608 |  |
Derivatives | 15,346 | 16,619 |  |
Carrying amount | Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 68,646 | 85,556 |  |
Carrying amount | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 35 | 45 |  |
Carrying amount | Securities in wholly owned statutory business trusts |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 11,561 | 11,561 |  |
Carrying amount | Other |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 500 | 500 |  |
Cash and due from banks | 565,202 | 388,311 |  |
Money market investments | 11,859,924 | 3,262,286 |  |
Trading account debt securities, excluding derivatives | 33,053 | 40,321 |  |
Debt Securities Available for Sale, at Fair Value | 21,177,839 | 17,648,473 |  |
Debt securities held-to-maturity, net | 80,742 | 97,662 |  |
Equity securities: |  |  |  |
Equity securities | 173,993 | 159,887 |  |
Loans held in portfolio, net | 28,466,660 | 26,929,165 |  |
Mortgage servicing rights | 123,552 | 150,906 | $ 150,652 | $ 169,777
Deposits |  |  |  |
Time deposits | 7,844,929 | 7,674,797 |  |
Total deposits | 56,021,983 | 43,758,606 |  |
Assets sold under agreements to repurchase | 106,028 | 193,378 |  |
Other short-term borrowings | 100,000 | 0 |  |
Notes payable: |  |  |  |
Notes Payable | 1,201,396 | 1,101,608 |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Financial Assets: |  |  |  |
Debt Securities Available for Sale, at Fair Value |  | 6,975 |  |
Debt securities held-to-maturity, net | 68,646 |  |  |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Financial Assets: |  |  |  |
Debt Securities Available for Sale, at Fair Value | 450,306 | 586,175 |  |
Debt securities held-to-maturity, net | 35 |  |  |
Securities in wholly owned statutory business trusts |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 11,561 |  |  |
Other |  |  |  |
Financial Assets: |  |  |  |
Debt Securities Available for Sale, at Fair Value | 257 | 350 |  |
Debt securities held-to-maturity, net | 500 |  |  |
Fair Value |  |  |  |
Financial Assets: |  |  |  |
Cash and due from banks | 565,202 | 388,311 |  |
Money market investments | 11,859,924 | 3,262,286 |  |
Trading account debt securities, excluding derivatives | 33,053 | 40,321 |  |
Debt Securities Available for Sale, at Fair Value | 21,177,839 | 17,648,473 |  |
Debt securities held-to-maturity, net | 95,093 | 105,110 |  |
Equity securities: |  |  |  |
FHLB Stock | 53,252 | 43,787 |  |
FRB stock | 92,721 | 93,470 |  |
Other investments | 28,397 | 28,695 |  |
Equity securities | 174,370 | 165,952 |  |
Loans held-for-sale | 104,915 | 60,030 |  |
Loans held in portfolio, net | 27,023,763 | 25,051,400 |  |
Mortgage servicing rights | 123,552 | 150,906 |  |
Derivatives | 18,080 | 17,966 |  |
Deposits |  |  |  |
Demand deposits | 48,177,054 | 36,083,809 |  |
Time deposits | 7,845,290 | 7,598,732 |  |
Total deposits | 56,022,344 | 43,682,541 |  |
Assets sold under agreements to repurchase | 105,699 | 193,271 |  |
Other short-term borrowings | 100,000 |  |  |
Notes payable: |  |  |  |
Advances with the FHLB | 540,547 | 429,718 |  |
Unsecured senior debt securities | 301,082 | 323,415 |  |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust | 407,262 | 395,216 |  |
FRB advances | 1,009 |  |  |
Notes Payable | 1,249,900 | 1,148,349 |  |
Derivatives | 15,346 | 16,619 |  |
Fair Value | Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 82,995 | 93,002 |  |
Fair Value | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 37 | 47 |  |
Fair Value | Securities in wholly owned statutory business trusts |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 11,561 | 11,561 |  |
Fair Value | Other |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 500 | 500 |  |
Fair Value | Level 1 |  |  |  |
Financial Assets: |  |  |  |
Cash and due from banks | 565,202 | 388,311 |  |
Money market investments | 11,853,978 | 3,256,274 |  |
Trading account debt securities, excluding derivatives | 4,106 | 7,081 |  |
Debt Securities Available for Sale, at Fair Value | 3,999,320 | 3,841,715 |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Equity securities: |  |  |  |
FHLB Stock | 0 | 0 |  |
FRB stock | 0 | 0 |  |
Other investments | 0 | 0 |  |
Equity securities | 0 | 0 |  |
Loans held-for-sale | 0 | 0 |  |
Loans held in portfolio, net | 0 | 0 |  |
Mortgage servicing rights | 0 | 0 |  |
Derivatives | 0 | 0 |  |
Deposits |  |  |  |
Demand deposits | 0 | 0 |  |
Time deposits | 0 | 0 |  |
Total deposits | 0 | 0 |  |
Assets sold under agreements to repurchase | 0 | 0 |  |
Other short-term borrowings | 0 |  |  |
Notes payable: |  |  |  |
Advances with the FHLB | 0 | 0 |  |
Unsecured senior debt securities | 0 | 0 |  |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust | 0 | 0 |  |
FRB advances | 0 |  |  |
Notes Payable | 0 | 0 |  |
Derivatives | 0 | 0 |  |
Fair Value | Level 1 | Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 1 | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 1 | Securities in wholly owned statutory business trusts |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 1 | Other |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 2 |  |  |  |
Financial Assets: |  |  |  |
Cash and due from banks | 0 | 0 |  |
Money market investments | 5,946 | 6,012 |  |
Trading account debt securities, excluding derivatives | 28,124 | 32,270 |  |
Debt Securities Available for Sale, at Fair Value | 17,177,395 | 13,805,576 |  |
Debt securities held-to-maturity, net | 12,061 | 12,061 |  |
Equity securities: |  |  |  |
FHLB Stock | 53,252 | 43,787 |  |
FRB stock | 92,721 | 93,470 |  |
Other investments | 26,718 | 21,328 |  |
Equity securities | 172,691 | 158,585 |  |
Loans held-for-sale | 0 | 0 |  |
Loans held in portfolio, net | 0 | 0 |  |
Mortgage servicing rights | 0 | 0 |  |
Derivatives | 18,080 | 17,966 |  |
Deposits |  |  |  |
Demand deposits | 48,177,054 | 36,083,809 |  |
Time deposits | 7,845,290 | 7,598,732 |  |
Total deposits | 56,022,344 | 43,682,541 |  |
Assets sold under agreements to repurchase | 105,699 | 193,271 |  |
Other short-term borrowings | 100,000 |  |  |
Notes payable: |  |  |  |
Advances with the FHLB | 540,547 | 429,718 |  |
Unsecured senior debt securities | 301,082 | 323,415 |  |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust | 407,262 | 395,216 |  |
FRB advances | 1,009 |  |  |
Notes Payable | 1,249,900 | 1,148,349 |  |
Derivatives | 15,346 | 16,619 |  |
Fair Value | Level 2 | Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 2 | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 2 | Securities in wholly owned statutory business trusts |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 11,561 | 11,561 |  |
Fair Value | Level 2 | Other |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 500 | 500 |  |
Fair Value | Level 3 |  |  |  |
Financial Assets: |  |  |  |
Cash and due from banks | 0 | 0 |  |
Money market investments | 0 | 0 |  |
Trading account debt securities, excluding derivatives | 823 | 970 |  |
Debt Securities Available for Sale, at Fair Value | 1,124 | 1,182 |  |
Debt securities held-to-maturity, net | 83,032 | 93,049 |  |
Equity securities: |  |  |  |
FHLB Stock | 0 | 0 |  |
FRB stock | 0 | 0 |  |
Other investments | 1,679 | 7,367 |  |
Equity securities | 1,679 | 7,367 |  |
Loans held-for-sale | 104,915 | 60,030 |  |
Loans held in portfolio, net | 27,023,763 | 25,051,400 |  |
Mortgage servicing rights | 123,552 | 150,906 |  |
Derivatives | 0 | 0 |  |
Deposits |  |  |  |
Demand deposits | 0 | 0 |  |
Time deposits | 0 | 0 |  |
Total deposits | 0 | 0 |  |
Assets sold under agreements to repurchase | 0 | 0 |  |
Other short-term borrowings | 0 |  |  |
Notes payable: |  |  |  |
Advances with the FHLB | 0 | 0 |  |
Unsecured senior debt securities | 0 | 0 |  |
Junior Subordinated Debenture Owed To Unconsolidated Subsidiary Trust | 0 | 0 |  |
FRB advances | 0 |  |  |
Notes Payable | 0 | 0 |  |
Derivatives | 0 | 0 |  |
Fair Value | Level 3 | Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 82,995 | 93,002 |  |
Fair Value | Level 3 | Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 37 | 47 |  |
Fair Value | Level 3 | Securities in wholly owned statutory business trusts |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | 0 | 0 |  |
Fair Value | Level 3 | Other |  |  |  |
Financial Assets: |  |  |  |
Debt securities held-to-maturity, net | $ 0 | $ 0 |  |

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- Definition Fair value portion of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References No definition available. + Details
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- Definition Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118948506&loc=SL51823488-111719 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or 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 liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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- Definition Including the current and noncurrent portions, the carrying value of junior subordinated long-term debt owed to unconsolidated subsidiary trusts as of the balance sheet date. Such debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets and was initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition 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. + References No definition available. + Details
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