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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Held To Maturity Securities | $ 150,627 | $ 156,190
Held To Maturity Securities Fair Value | 131,032 | 132,759
US States And Political Subdivisions [Member] | Puerto Rico [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held To Maturity Securities | 150,627 | 156,190
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 0 | 0
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 19,595 | 23,431
Held To Maturity Securities Fair Value | $ 131,032 | $ 132,759
Held To Maturity Securities Debt Maturities Average Yield | 5.03% | 4.73%
US States And Political Subdivisions [Member] | After One To Five Years [Member] | Puerto Rico [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held To Maturity Securities | $ 3,853 | $ 1,136
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 0 | 0
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 173 | 20
Held To Maturity Securities Fair Value | $ 3,680 | $ 1,116
Held To Maturity Securities Debt Maturities Average Yield | 5.38% | 5.38%
US States And Political Subdivisions [Member] | After Five To Ten Years [Member] | Puerto Rico [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held To Maturity Securities | $ 39,523 | $ 10,741
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 0 | 0
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 3,048 | 718
Held To Maturity Securities Fair Value | $ 36,475 | $ 10,023
Held To Maturity Securities Debt Maturities Average Yield | 5.28% | 4.47%
US States And Political Subdivisions [Member] | After Ten Years [Member] | Puerto Rico [Member] |  |
Schedule Of Held To Maturity Securities [Line Items] |  |
Held To Maturity Securities | $ 107,251 | $ 144,313
Held To Maturity Securities Accumulated Unrecognized Holding Gain | 0 | 0
Held To Maturity Securities Accumulated Unrecognized Holding Loss | 16,374 | 22,693
Held To Maturity Securities Fair Value | $ 90,877 | $ 121,620
Held To Maturity Securities Debt Maturities Average Yield | 4.93% | 4.74%

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- Definition Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.6) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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