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BUSINESS COMBINATIONS - Additional Information - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended		12 Months Ended
	Aug. 30, 2019	Apr. 01, 2018	Sep. 30, 2019	Jun. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 1,059,504
Cash consideration	$ 53,700	43
Stock consideration	60,900	1,043,424
Total assets acquired	74,900	4,402,804
Total liabilities assumed	18,400	4,018,943			$ 0	$ 18,380	$ 4,018,948
Goodwill	58,000	675,643	$ 58,000	$ 676,200	$ 0	$ 57,520	$ 676,167
Loans		2,792,572
Business Combination, Acquired Receivables, Gross Contractual Amount		$ 2,900,000
Bannockburn [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 114,600

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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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-Publisher FASB
-Name Accounting Standards Codification
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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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