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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Aug. 01, 2018 | Dec. 31, 2017
Financing Receivable, Modifications [Line Items] |  |  |  |
Recent Loss Trend Adjustment | 12-months |  |  |
Increase Watch Category Puerto Rico | $ 581,000 |  |  |
Reliable Financial Services |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Loans |  |  | $ 1,785,958 |
Reliable Financial Services | Commercial Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Loans |  |  | $ 341,000 |
Popular U.S. |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recent Loss Trend Adjustment Percentage | 6.00% | 5.00% |  |
Non Covered Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings | $ 1,431,012 |  |  | $ 1,258,327
Non Covered Loans | Banco Popular de Puerto Rico |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Recent Loss Trend Adjustment Percentage | 80.00% | 45.00% |  |
Commercial | Non Covered Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings | $ 319,446 |  |  | 220,846
Mortgage and consumer |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Historical Loss Period | 18-months |  |  |
Commercial and construction |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Historical Loss Period | 5-year |  |  |
Mortgages | Non Covered Loans |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings | $ 997,362 |  |  | 930,076
Mortgages | Non Covered Loans | Guaranteed By US Sponsored Entities |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Troubled debt restructurings | 503,000 |  |  | 449,000
Loan |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Change Allowance For Loan Losses Recalibration And Updates Of The Enviromental Factors Adjustments | 6,100 |  |  |
Loan | Popular U.S. |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Change Allowance For Loan Losses Recalibration And Updates Of The Enviromental Factors Adjustments | 200 |  |  |
Loan | Non Covered Loans | Banco Popular de Puerto Rico |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Change Allowance For Loan Losses Recalibration And Updates Of The Enviromental Factors Adjustments | 5,900 |  |  |
Loan | Commercial |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | $ 17,000 |  |  | $ 8,000

X
- Definition Amount of loans acquired at the acquisition date. + References No definition available. + Details
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- Definition Recalibration and updates of the enviromental factors adjustments. + References No definition available. + Details
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- Definition Historical loss period used to compute the base net loss rate in the determination for the general reserves of the allowance for loan losses. + References No definition available. + Details
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- Definition Recent loss trend adjustment replaces the base loss rate, when these trends are higher than the respective base loss rates, up to a determined cap. The objective of this adjustment is to include information about recent increases in loss rates in a timely and prudent manner. + References No definition available. + Details
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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554 + Details
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- Definition Reflects the unfunded portion of contractual agreements to lend funds to borrowers for loans whose terms have been modified by troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18794-111554 + Details
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