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INCOME TAXES - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Tax Contingency [Line Items]
Minimum percentage of bank net taxable income for paying Income tax at normal rate			20.00%
Income tax expense	$ 18,011	$ 10,159	$ 35,629	$ 17,917
Estimated annual effective tax rate excluding entities from which a tax benefit cannot be recognized and discrete items			29.00%	25.00%
Effective Income Tax Rate Continuing Operations			29.00%	24.00%
Effective Income Tax Rate Excluding Discrete Items			30.00%	25.00%
Deferred Tax Assets Net	290,300		$ 290,300
Valuation allowance	92,800		92,800
United States [Member]
Income Tax Contingency [Line Items]
Income tax expense	1,200	$ 1,000	2,200	$ 2,600
FirstBank [Member]
Income Tax Contingency [Line Items]
Deferred Tax Assets Net	290,200		290,200		$ 319,800
Valuation allowance	$ 60,000		$ 60,000		$ 68,100
Domestic Tax Authority [Member] | Other taxable domestic corporations member [Member]
Income Tax Contingency [Line Items]
Dividend received deduction			85.00%
Domestic Tax Authority [Member] | Subsidiaries [Member]
Income Tax Contingency [Line Items]
Dividend received deduction			100.00%

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Represents the effective income tax rate excluding discrete items which are primarily related to a tax benefit resulting from the change in tax status of certain subsidiaries.

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Minimum IBE's percentage of bank net taxable income for the IBE's to pay income tax at normal rate.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for dividend.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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