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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%