LOANS AND LEASES - Schedule of Financial Effects of Loans Modified (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	24 months	16 months	23 months	14 months
Weighted Average Interest Rate Reduction	0.69%	3.51%	0.86%	3.49%
Weighted Average Payment Delay (in Months)	10 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)	27 months	17 months	24 months	15 months
Weighted Average Interest Rate Reduction	0.64%	3.67%	0.74%	3.63%
Weighted Average Payment Delay (in Months)	10 months	6 months	28 months	5 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)	60 months	47 months	19 months	22 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%	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)	86 months	13 months	39 months	12 months
Weighted Average Interest Rate Reduction	1.81%	3.50%	1.42%	3.52%
Weighted Average Payment Delay (in Months)	0 months	0 months	20 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)	20 months	15 months	24 months	13 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%	0.00%
Weighted Average Payment Delay (in Months)	6 months	0 months	48 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)	20 months	24 months	16 months	21 months
Weighted Average Interest Rate Reduction	0.54%	5.17%	0.66%	4.60%
Weighted Average Payment Delay (in Months)	10 months	6 months	10 months	5 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)	0 months		0 months
Weighted Average Interest Rate Reduction	0.00%		0.00%
Weighted Average Payment Delay (in Months)	6 months		6 months
Amount of Principal Forgiven	$ 0		$ 0
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	90 months	68 months	68 months	60 months
Weighted Average Interest Rate Reduction	4.77%	3.44%	2.45%	3.42%
Weighted Average Payment Delay (in Months)	0 months	0 months	0 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)	120 months	69 months	73 months	61 months
Weighted Average Interest Rate Reduction	0.00%	3.44%	1.51%	3.44%
Weighted Average Payment Delay (in Months)	0 months	0 months	0 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	53 months	60 months	55 months
Weighted Average Interest Rate Reduction	3.00%	0.41%	4.08%	0.40%
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)	32 months	25 months	30 months	25 months
Weighted Average Interest Rate Reduction	0.00%	0.70%	0.26%	0.70%
Weighted Average Payment Delay (in Months)	0 months	0 months	0 months	0 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
Consumer | Consumer other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	0 months	60 months	46 months	60 months
Weighted Average Interest Rate Reduction	7.53%	9.21%	8.79%	9.33%
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)	10 months	3 months	12 months	4 months
Weighted Average Interest Rate Reduction	2.75%	0.00%	2.75%	0.00%
Weighted Average Payment Delay (in Months)	10 months	6 months	10 months	6 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0
SVB | Global fund banking
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)		0 months
Weighted Average Interest Rate Reduction		0.00%
Weighted Average Payment Delay (in Months)		0 months
Amount of Principal Forgiven		$ 0
SVB | Investor dependent - early stage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term Extension (in Months)	10 months	6 months	10 months	6 months
Weighted Average Interest Rate Reduction	2.75%	0.00%	2.75%	0.00%
Weighted Average Payment Delay (in Months)	8 months	4 months	8 months	4 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)	7 months	0 months	15 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%
Weighted Average Payment Delay (in Months)	7 months	0 months	8 months
Amount of Principal Forgiven	$ 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)	11 months	3 months	11 months	4 months
Weighted Average Interest Rate Reduction	0.00%	0.00%	0.00%	0.00%
Weighted Average Payment Delay (in Months)	11 months	7 months	11 months	7 months
Amount of Principal Forgiven	$ 0	$ 0	$ 0	$ 0