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RECENTLY ADOPTED AND ISSUED ACCOUNTING STANDARDS - Additional Information (Details) - USD ($) $ in Thousands		6 Months Ended
	Jan. 01, 2020	Jun. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method	$ 61,505	$ 61,505
Off-Balance Sheet, Credit Loss, Liability, Change in Method, Credit Loss Expense (Reversal)	12,155
Deferred tax liability, Credit Loss, Change in Method, Credit Loss Expense (Reversal)	(16,778)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest				$ 2,258,942	$ 2,282,070	$ 2,179,383	$ 2,247,705
Loans and Leases Receivable, Allowance	$ 119,155	158,661	$ 159,590	169,923	175,679	143,885	57,650
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest							(56,882)
Retained earnings
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest		$ 675,532		$ 745,220	720,429	$ 660,653	711,249
Retained earnings | Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest					$ (56,900)		$ (56,882)

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