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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Gain (Loss) on Securities [Line Items] |  |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  |  | $ 519,100 | $ 290,700 | $ 190,000
Available-for-sale Securities, Gross Realized Gains |  |  | 2,100 | 500 | 1,800
Available-for-sale Securities, Gross Realized Losses |  |  | 2,100 | 600 | 200
Available For Sale Securities Net Realized Gain Loss Tax Provision |  |  | 0 |  | 600
Securities transferred from HTM to AFS | $ 268,700 | $ 372,100 | 268,703 | 372,128 | $ 0
Realized gain (loss) on debt securities transferred from HTM to AFS | $ 200 |  |  |  |
Pledged Financial Instruments, Not Separately Reported, Securities |  |  | $ 1,100,000 | $ 1,200,000 |
NumberOfSecuritiesInSecurityPortfolio |  |  | 1,273 | 1,417 |
NumberOfSecuritiesInUnrealizedLossPosition |  |  | 140 | 504 |

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- Definition Amount of investment in debt security, measured at amortized cost, transferred to investment in debt security, measured at fair value, with change in fair value recognized in other comprehensive income (available-for-sale) and net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27405-111563 + Details
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