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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Credit Losses Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments	$ 78,243	$ 57,649	$ 57,649
Total loans	5,667,464		5,951,885
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments	3,900		4,100
Commercial | Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unfunded loan commitments		$ 22,353
Loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accrued interest receivable on loans receivable	$ 18,800		$ 18,900

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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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