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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total recorded investment | $ 7,251,480 | $ 5,898,405
CARES Act | Commercial |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Total recorded investment | 123,100 | $ 210,000
Unamortized loan commitment and origination fees and unamortized discounts or premiums | $ 772 |
CARES Act | Commercial | Minimum |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Average life of PPP loans | 12 months |
CARES Act | Commercial | Maximum |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
Average life of PPP loans | 18 months |

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- Definition Amount excluding accrued interest, before allowance for credit loss, 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 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447 + Details
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- Definition Amount of deferred fees paid by borrowers and unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of loans that are being amortized into income as an adjustment to yield. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6378536&loc=d3e10092-111533 + Details
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