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Note Goodwill and other intangible assets - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Aug. 01, 2018 | Jul. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Amortization Of Intangible Assets | $ 2,324 | $ 2,345 | $ 6,973 | $ 7,034 |  |  |
Trademark recognized | $ 6,100 |  | 6,100 |  |  |  | $ 6,100
Goodwill on acquisition |  |  | $ 60,242 |  |  |  |
Maximum | Discounted cash flow approach |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Cost of equity discount rate | 13.93% |  | 13.93% |  |  |  |
Minimum | Discounted cash flow approach |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Cost of equity discount rate | 11.42% |  | 11.42% |  |  |  |
Reliable Financial Services |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Trademark recognized |  |  |  |  | $ 488 |  |
Reliable Financial Services | Trademarks |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Trademark recognized | $ 500 |  | $ 500 |  |  |  |
Banco Popular de Puerto Rico and Popular Bank |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Percentage Of Goodwill |  |  |  |  |  | 98.00% |
PB |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Step 1 Fair Value Excess Over Carrying Amount |  |  |  |  |  | $ 407,000 |
Percentage excess of fair value of reporting unit over equity value |  |  |  |  |  | 28.00% |
BPPR |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Step 1 Fair Value Excess Over Carrying Amount |  |  |  |  |  | $ 2,400 |
Percentage excess of fair value of reporting unit over equity value |  |  |  |  |  | 77.00% |
Goodwill on acquisition |  |  | $ 60,242 |  |  |  |
BPPR | Reliable Financial Services |  |  |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |
Goodwill on acquisition | $ 60,200 |  |  |  |  |  |

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