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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses recovery from settlement of charged off	$ 31,300
Initial reserve based on ACL methodology	0	$ 16,200	$ 0
Loans receivable	7,115,038	7,251,480
Allowance for Loan Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recoveries	33,896	3,358
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable	28,600	25,800
PCD loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial reserve based on ACL methodology		13,700
Shared National Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable			16,100
Charge-offs			10,700
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recoveries	33,896	3,358	1,815
Commercial real estate | Allowance for Loan Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recoveries	33,896	3,358	$ 1,815
Commercial real estate | PCD loans | Allowance for Loan Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recoveries		2,600
Unfunded loan commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for unfunded loan commitments	5,300	5,600
Initial reserve based on ACL methodology		11,300
Commercial | Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable	1,259,651	1,311,105
Commercial | Commercial real estate | Allowance for Loan Losses
Accounts, Notes, Loans and Financing Receivable [Line Items]
Recoveries	$ 7	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net charge-offs		4,400
SBA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net charge-offs		$ 2,000

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