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LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) loan branch	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($) loan
Allowance for loan losses
Net loans	$ 8,239,039	$ 6,719,753
Payments to acquire loans and leases held-for-investment	718,000	211,000	$ 98,000
Proceeds from sale of loans and leases held-for-investment	366,000	560,000	415,000
Gain (loss) on sales of loans, net	12,500	20,700	$ 10,600
Total loans	8,335,309	6,825,847
Due to related parties	1,500	1,700
Loans receivable, related parties	$ 800	$ 1,000
Number of contracts | loan	2	4	0
Asset Pledged as Collateral
Allowance for loan losses
Loans pledged as collateral	$ 800,000	$ 700,000
Commercial and industrial loans
Allowance for loan losses
Total loans	1,445,236	1,284,429
Financing receivable, nonaccrual, medallion loans, fair value	600	1,200
Financing receivable, nonaccrual, medallion loans, contractual balance	$ 10,900	$ 31,400
Number of contracts	1	2
Residential real estate | Collateralized Residential Mortgage Loans, In Process of Foreclosure
Allowance for loan losses
Total loans	$ 3,000	$ 1,400
Total Loans | Credit Concentration Risk | Non-Residential
Allowance for loan losses
Total loans	$ 1,900,000	$ 1,600,000
Concentration risk, percentage	22.70%	24.00%
Small Business Administration (SBA), CARES Act, Paycheck Protection Program
Allowance for loan losses
Net loans	$ 5,800	$ 29,900

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