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DERIVATIVES - Disclosure by Type of Financial Instrument (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized liabilities | $ 226,891 | $ 272,606
Derivative Liability, Fair Value, Gross Asset | (259,256) | (402,480)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (32,365) | (129,874)
Fair Value Hedges | Matched interest rate swaps | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized liabilities | 122,191 | 184,991
Derivative Liability, Fair Value, Gross Asset | (249,003) | (385,088)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | (126,812) | (200,097)
Fair Value Hedges | Foreign Exchange [Member] | Accrued interest and other liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Gross amounts of recognized liabilities | 104,700 | 87,615
Derivative Liability, Fair Value, Gross Asset | (10,253) | (17,392)
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 94,447 | $ 70,223

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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=121570589&loc=SL51823488-111719 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624163-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226000-175313 + Details
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