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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Performance of Loans Modified in Last Twelve Months (Details) $ in Millions	Mar. 31, 2023 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	$ 0
30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Construction
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Construction | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Construction | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Construction | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Commercial multifamily
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Commercial multifamily | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Commercial multifamily | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial loans | Commercial multifamily | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate owner occupied | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate owner occupied | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate owner occupied | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate non-owner occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate non-owner occupied | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate non-owner occupied | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial real estate | Commercial real estate non-owner occupied | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial and industrial | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Commercial and industrial | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Residential real estate | Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Residential real estate | Residential real estate | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Residential real estate | Residential real estate | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Residential real estate | Residential real estate | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Home equity | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Home equity | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Home equity | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Consumer other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Consumer other | 30-59 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Consumer other | 60-89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	0
Consumer | Consumer other | Greater Than 89 Days Past Due
Financing Receivable, Allowance for Credit Loss [Line Items]
Total Past Due	$ 0

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