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Loans (Narratives) (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Loans And Leases Receivable Disclosure [Line Items] |  |  |
Originated loans granted to Puerto Rico government | $ 99,100,000 | $ 134,000,000.0 |
Financing receivable modifications. recorded investment not included in non-accrual | 109,200,000 | 103,700,000 |
Balance of revolving loans converted to term loans, amount | 21,000,000.0 |  |
Commitment to lend additional funds | 0 | 0 | $ 0
Loan deferral amount, pandemic related | 95,700,000 |  |
Loans | 6,662,133,000 | 6,738,795,000 |
Mortgage Loans - GNMA Buy-Back Option Program [Member] |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |
Delinquent loans | 56,200,000 | 75,200,000 |
Granted To Puerto Rico Government [Member] |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |
Loans | 98,000,000.0 | 129,900,000 |
One Loan, Public Corporation Acquired [Member] |  |  |
Loans And Leases Receivable Disclosure [Line Items] |  |  |
Loans | $ 1,100,000 | $ 24,100,000 |

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings, and are not in non-accrual status. + References No definition available. + Details
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- Definition Total amount of loans granted to Puerto Rico Government as part of the institutional commercial loan segment. + References No definition available. + Details
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- Definition This is the principal amount of loans (across all types of loans) that are overdue in payment by a set number of days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (e)(4) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + 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=121593590&loc=d3e4428-111522 + Details
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- Definition Amount of unfunded portion of contractual agreement to lend funds to borrower for financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18794-111554 + Details
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