LOANS AND LEASES - Schedule of Financial Effects of Loans Modified (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	14 months	9 months	19 months	13 months
Weighted Average Interest Rate Reduction	2.19%	1.49%	1.07%	2.21%
Weighted Average Payment Delay (in Months)	6 months	6 months	14 months	6 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	15 months	8 months	20 months	13 months
Weighted Average Interest Rate Reduction	2.03%	2.12%	0.93%	2.66%
Weighted Average Payment Delay (in Months)	6 months	7 months	26 months	6 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Commercial | Commercial construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	36 months	3 months	15 months	4 months
Weighted Average Interest Rate Reduction	0.60%	0.00%	0.60%	0.00%
Weighted Average Payment Delay (in Months)	0 months	0 months	0 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Commercial | Owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	17 months	19 months	28 months	14 months
Weighted Average Interest Rate Reduction	1.82%	4.25%	1.67%	3.53%
Weighted Average Payment Delay (in Months)	6 months	0 months	18 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Commercial | Non-owner occupied commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	7 months	6 months	20 months	11 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%	0.00%
Weighted Average Payment Delay (in Months)	6 months	0 months	40 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	17 months	14 months	16 months	19 months
Weighted Average Interest Rate Reduction	2.61%	2.11%	0.71%	2.25%
Weighted Average Payment Delay (in Months)	6 months	7 months	11 months	6 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	11 months		11 months
Weighted Average Interest Rate Reduction	0.00%		0.00%
Weighted Average Payment Delay (in Months)	0 months		6 months
Amount of Principal Forgiven	$ 0		$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	52 months	88 months	66 months	74 months
Weighted Average Interest Rate Reduction	3.29%	4.41%	3.41%	3.56%
Weighted Average Payment Delay (in Months)	11 months	0 months	11 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	47 months	91 months	70 months	76 months
Weighted Average Interest Rate Reduction	2.07%	5.25%	2.09%	3.52%
Weighted Average Payment Delay (in Months)	11 months	0 months	11 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Consumer | Revolving mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	60 months	58 months	60 months	57 months
Weighted Average Interest Rate Reduction	5.42%	3.40%	4.73%	2.44%
Weighted Average Payment Delay (in Months)	0 months	0 months	0 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Consumer | Consumer auto
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	31 months		29 months	25 months
Weighted Average Interest Rate Reduction	0.00%		0.26%	0.70%
Weighted Average Payment Delay (in Months)	0 months		0 months	0 months
Amount of Principal Forgiven	$ 0		$ 0	$ 0
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	60 months	36 months	57 months	54 months
Weighted Average Interest Rate Reduction	10.54%	7.63%	9.65%	8.47%
Weighted Average Payment Delay (in Months)	0 months	0 months	0 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
SVB
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	11 months	7 months	11 months	5 months
Weighted Average Interest Rate Reduction	0.00%	1.00%	2.75%	1.00%
Weighted Average Payment Delay (in Months)	6 months	5 months	9 months	5 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
SVB | Investor dependent - early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	6 months	10 months	9 months	9 months
Weighted Average Interest Rate Reduction	0.00%	1.00%	2.75%	1.00%
Weighted Average Payment Delay (in Months)	7 months	5 months	8 months	5 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
SVB | Investor dependent - growth stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	9 months	11 months	12 months	11 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%	0.00%
Weighted Average Payment Delay (in Months)	6 months	5 months	8 months	5 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
SVB | Innovation C&I and cash flow dependent
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	12 months	4 months	12 months	4 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%	0.00%
Weighted Average Payment Delay (in Months)	0 months	0 months	12 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0