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Note Allowance for loan losses (Allowance for loan losses - Additional Information) (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Financing Receivable |  |  |
Recent Loss Trend Adjustment | 12-months |  |
Non Covered Loans |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | $ 1,530,015 |  | $ 1,515,889
Non Covered Loans | Banco Popular de Puerto Rico |  |  |
Financing Receivable |  |  |
Recent Loss Trend Adjustment Percentage | 41.00% | 45.00% |
Non Covered Loans | PB |  |  |
Financing Receivable |  |  |
Recent Loss Trend Adjustment Percentage | 23.00% | 5.00% |
Mortgage and consumer |  |  |
Financing Receivable |  |  |
Historical Loss Period | 18-months |  |
Commercial and construction |  |  |
Financing Receivable |  |  |
Historical Loss Period | 5-year |  |
Mortgages | Non Covered Loans |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | $ 1,074,502 |  | 1,042,470
Mortgages | Non Covered Loans | Guaranteed by us sponsored entities |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | 570,000 |  | 543,000
Commercial | Non Covered Loans |  |  |
Financing Receivable |  |  |
Troubled debt restructurings | 345,019 |  | 360,679
Loan | Commercial |  |  |
Financing Receivable |  |  |
Outstanding commitments to lend additional funds to debtors owing receivables whose terms have been modified in troubled debt restructurings | $ 12,000 |  | $ 16,000

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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 Percentage of the ALLL for our loan portfolios that utilized the recent loss trend adjustment instead of the base loss. + References No definition available. + 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 The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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