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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - New Accounting Standards (Illustration of the Impact of ASC 326) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans | $ 160,540 | $ 89,778 | $ 42,294 | $ 41,045 | $ 38,208
Total Allowance for credit losses | 160,540 | 94,838 | 42,294 |  |
Previous Accounting Guidance |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  |  | 42,294 |  |
Total Allowance for credit losses |  |  | 43,194 |  |
Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | 47,484 |  |  |
Total Allowance for credit losses |  | 51,644 |  |  |
Commercial Portfolio |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans | 117,403 | 37,125 | 30,941 |  |
Commercial Portfolio | Previous Accounting Guidance |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  |  | 30,941 |  |
Commercial Portfolio | Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | 6,184 |  |  |
Consumer Portfolio |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans | $ 43,137 | 52,653 | 11,353 |  |
Consumer Portfolio | Previous Accounting Guidance |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  |  | 11,353 |  |
Consumer Portfolio | Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Allowance for credit losses on loans |  | 41,300 |  |  |
Unfunded Commitments |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Total Allowance for credit losses |  | 5,060 |  |  |
Unfunded Commitments | Previous Accounting Guidance |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Total Allowance for credit losses |  |  | $ 900 |  |
Unfunded Commitments | Accounting Standards Update 2016-13 | Restatement Adjustment |  |  |  |  |
Item Effected [Line Items] |  |  |  |  |
Total Allowance for credit losses |  | $ 4,160 |  |  |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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