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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Allowance for Loan and Lease Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	$ 5,898,405	$ 5,951,885
Unamortized loan commitment and origination fees and unamortized discounts or premiums	6,200	14,300
SBA | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	273,444	$ 70,981
CARES Act | Commercial
Financing Receivable, Troubled Debt Restructuring [Line Items]
Loans receivable	210,000
Unamortized loan commitment and origination fees and unamortized discounts or premiums	$ 1,600

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- Definition

Amount, before allowance for credit loss, of financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 20
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