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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($) qtr	Dec. 31, 2022 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Valuation period | qtr		7
Forecasting revision period		1 year
Commercial loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, reclassification, held for sale	$ 0.0		$ 0.0
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, nonaccrual, medallion loans, fair value	0.4	$ 0.4	0.6
Financing receivable, nonaccrual, medallion loans, contractual balance	$ 9.3	$ 9.3	$ 10.9

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph c
-Publisher SEC

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-11

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

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