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INVESTMENT SECURITIES - Investment Securities Held to Maturity (Securities in continuous unrealized loss position) (Detail) - PUERTO RICO - Municipal Bonds [Member] - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule Of Held To Maturity Securities [Line Items] |  |
Held to maturity less than twelve months fair value | $ 0 | $ 0
Held to maturity less than twelve months unrealized losses | 0 | 0
Held to maturity securities twelve months or longer fair value | 123,114 | 125,658
Held to maturity securities twelve month or longer unrealized losses | 21,558 | 19,157
Held to maturity unrealized loss position fair value | 123,114 | 125,658
Held to maturity unrealized loss position aggregate losses | $ 21,558 | $ 19,157

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- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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