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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Purchases, Sales, and Transfers (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Receivables [Abstract] |  |  |  |
Purchases of loans (excluding loans held-for-sale) | $ 249,400,000 | $ 129,000,000 | $ 615,400,000 | $ 154,900,000
Transfers of loans from held-for-sale | 0 | 0 | 0 | 0
Transfers of loans to held-for-sale | 0 | 0 | 0 | 0
Loans sold | $ 0 | $ 0 | $ 0 | $ 0

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- Definition Amount of increase from purchase of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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- Definition Amount of decrease from sale and reclassification to held-for-sale of financing receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 11 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919244-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524 + Details
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