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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Reserve balances required	$ 92.7	$ 72.8
Deposits at other financial institutions in excess of FDIC insured limits	$ 20.0	$ 42.0
Deposits at other financial institutions in excess of FDIC insured limits, yield (as a percent)	0.25%	2.50%

X

- Definition

Due from Banks, at or Above FDIC Insurance Limit

+ References

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- Definition

Due from Banks, at or Above FDIC Insurance Limit, Yield, Percentage

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- Definition

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=116631393&loc=SL116631396-227033

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