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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Loans Sold and Purchased (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	$ 285,337	$ 0	$ 59,481
Sales	0	0	0
Commercial | Multifamily
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	120,900	0	0
Sales	0	0	0
Commercial | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	14,750	0	0
Sales	0	0	0
Consumer | Single family residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchases	149,687	0	59,481
Sales	$ 0	$ 0	$ 0

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Amount of increase from purchase 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 11
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919244-210447

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 50
-Paragraph 11B
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Amount of decrease from sale and reclassification to held-for-sale of financing receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 11
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