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INVESTMENT SECURITIES INVESTMENTS - Additional Information (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Gain (Loss) on Securities [Line Items] |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale | $ 290,700 | $ 190,000 | $ 207,000
Available-for-sale Securities, Gross Realized Gains | 500 | 1,800 | 1,200
Available-for-sale Securities, Gross Realized Losses | 600 | 200 | 1,000
Available For Sale Securities Net Realized Gain Loss Tax Provision | 0 | 600 | 100
Securities transferred from AFS to HTM | 372,128 | 0 | 0
Proceeds from Sale of Held-to-maturity Securities | 0 | 0 | $ 4,862
Pledged Financial Instruments, Not Separately Reported, Securities | $ 1,200,000 | $ 800,000 |
NumberOfSecuritiesInSecurityPortfolio | 1,417 | 775 |
NumberOfSecuritiesInUnrealizedLossPosition | 504 | 237 |

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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=82897076&loc=d3e27405-111563 + Details
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- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
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