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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Mar. 31, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Valuation allowance	$ 183,200			$ 183,200
Income tax expense (benefit)	12,332	$ (8,398)		30,249	$ (7,181)
Deferred Tax Assets Net	$ 272,300			$ 272,300
Minimum percentage of bank net taxable income for paying Income tax at normal rate	20.00%			20.00%
Estimated annual effective tax rate excluding entities from which a tax benefit cannot be recognized and discrete items				26.00%	20.00%
Effective Income Tax Rate Continuing Operations				24.00%	(2.00%)
Effective Income Tax Rate Excluding Discrete Items				25.00%	21.00%
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability			$ (13,200)
FirstBank [Member]
Income Tax Contingency [Line Items]
Valuation allowance	$ 142,200			$ 142,200		$ 150,700
Deferred Tax Assets Net	$ 272,200			272,200		$ 294,700
Domestic Tax Authority [Member] | Other taxable domestic corporations member [Member]
Income Tax Contingency [Line Items]
Percentage of dividend received deduction	85.00%
Domestic Tax Authority [Member] | Subsidiaries [Member]
Income Tax Contingency [Line Items]
Percentage of dividend received deduction	100.00%
United States [Member]
Income Tax Contingency [Line Items]
Foreign Income Tax Expense (Benefit), Continuing Operations	$ 1,200	$ 1,600		$ 3,800	$ 1,600

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