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LOANS AND ALLOWANCE FOR LOAN LOSSES - Allowance for Loan Losses Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs recorded		$ 41,766	$ 18,499	$ 5,581
Loans receivable		5,951,885	7,700,873
Line of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs recorded	$ 13,900	35,100
Loans receivable	$ 15,000
Unfunded loan commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Reserve for unfunded loan commitments		4,100	4,600
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-offs recorded		36,787	1,927
Change in allowance		3,000
Loans receivable		$ 1,691,270	$ 1,944,142

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Amount of increase (decrease) of allowance reserve for credit loss.

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Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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