Commitments and Contingencies Disclosure [Line Items]

No definition available.

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- Definition

Concentration of Risk Credit Facilities with the Puerto Rico government that is outstanding.

+ References

No definition available.

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- Definition

Amount before allowance of consumer mortgage held and guaranteed by the Puerto Rico Housing Authority.

+ References

No definition available.

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- Definition

Represents the sum of net gains/losses on the sale of investment securities (excluding trading account securities), other-than-temporary impairments on equity securities and gains on prepayment penalties from investment securities redeemed.

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No definition available.

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- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 8B
-URI http://asc.fasb.org/extlink&oid=73527792&loc=SL6284393-111563

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- Definition

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SX 210.12-09)
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

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Note Commitments and contingencies (Commitments) - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Commitments and Contingencies Disclosure [Line Items]
Other-than-temporary impairment on investment securities	$ 0	$ 0	$ 8,299	$ 209
Net (loss) gain and valuation adjustments on investment securities	103	$ 349	284	$ 1,932
COFINA \| AFS Securities Sold [Member]
Commitments and Contingencies Disclosure [Line Items]
Net (loss) gain and valuation adjustments on investment securities	100
PR Government Direct Exposure
Commitments and Contingencies Disclosure [Line Items]
Concentration Risk Credit Risk Financial Instrument Maximum Exposure			483,592		$ 584,491
PR Government Direct Exposure \| From Municipalities
Commitments and Contingencies Disclosure [Line Items]
Concentration Risk Credit Risk Financial Instrument Maximum Exposure			483,538
PR Government Indirect Exposure
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	391,000		391,000		406,000
PR Government Indirect Exposure \| PR Housing Bonds backed by second mortgage loans
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	43,000		43,000		43,000
PR Government Indirect Exposure \| Commercial real estate
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	29,000		29,000		31,000
PR Government Indirect Exposure \| Pass Through securities that have been economically defeased and refunded
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	6,000		6,000		6,000
USVI Government Direct Exposure \| From USVI Government And Public Corporations
Commitments and Contingencies Disclosure [Line Items]
Concentration Risk Credit Risk Financial Instrument Maximum Exposure			82,000
Outstanding Balance \| PR Government Direct Exposure
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	481,750		481,750		529,339
Outstanding Balance \| PR Government Direct Exposure \| From Municipalities
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	481,696		481,696		511,894
Outstanding Balance \| PR Government Indirect Exposure
Commitments and Contingencies Disclosure [Line Items]
Loans and Leases Receivable, Consumer, Mortgage with PRHA	313,000		313,000		326,000
Commitments To Extend Credit
Commitments and Contingencies Disclosure [Line Items]
Reserve of potential losses associated with unfunded loan commitments	9,000		9,000		9,000
Loans \| Outstanding Balance \| PR Government Direct Exposure
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	432,651		432,651		458,794
Loans \| Outstanding Balance \| PR Government Direct Exposure \| From Municipalities
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	432,651		432,651
Securities Investment \| Outstanding Balance \| PR Government Direct Exposure
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	49,099		49,099		$ 70,545
Securities Investment \| Outstanding Balance \| PR Government Direct Exposure \| From Municipalities
Commitments and Contingencies Disclosure [Line Items]
Concentration Of Risk Credit Facilities	$ 49,045		$ 49,045