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Note Debt Securities Held-to-maturity (HTM debt securities in a continuous unrealized loss position) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Held-to-maturity [Line Items] |  |
Less than 12 months Fair Value | $ 17,359 | $ 0
Less than 12 months Gross Unrealized Losses | 219 | 0
12 months or more Fair Value | 14,926 | 36,439
12 months or more Gross Unrealized Losses | 584 | 13,356
Total Fair Value | 32,285 | 36,439
Total Gross Unrealized Losses | 803 | 13,356
Obligations of Puerto Rico, States and political subdivisions |  |
Debt Securities, Held-to-maturity [Line Items] |  |
Less than 12 months Fair Value | 17,359 | 0
Less than 12 months Gross Unrealized Losses | 219 | 0
12 months or more Fair Value | 14,431 | 35,696
12 months or more Gross Unrealized Losses | 579 | 13,349
Total Fair Value | 31,790 | 35,696
Total Gross Unrealized Losses | 798 | 13,349
Other |  |
Debt Securities, Held-to-maturity [Line Items] |  |
Less than 12 months Fair Value | 0 | 0
Less than 12 months Gross Unrealized Losses | 0 | 0
12 months or more Fair Value | 495 | 743
12 months or more Gross Unrealized Losses | 5 | 7
Total Fair Value | 495 | 743
Total Gross Unrealized Losses | $ 5 | $ 7

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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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