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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Additional Information (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($) Loan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable		$ 5,898,405	$ 5,951,885
Provision (reversal of provision)		29,719	35,829	$ 31,121
Commercial lending relationship threshold	$ 5,000
Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable		24,700	18,800
Line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable				15,000
Charge-offs recorded				$ 13,900
Shared National Credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable			16,100
Charge-offs recorded		10,700
Unfunded loan commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Count | Loan	53
Commitments to purchase or sell	$ 536,000
Commercial | Loans Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-off of line of credit			35,100
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable		$ 2,088,308	$ 1,691,270

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The increase (decrease) during the period in the carrying amount of assets, which may include but are not limited to cash and investments, received as collateral pertaining to securities loaned to a counterparty to the transaction. Includes the change during the period in any unrealized gain or loss on such investments.

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