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LOAN PORTFOLIO -Changes in Carrying Amount Of Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable Impaired [Line Items]        
Beggining balance of period $ 8,858,123      
Ending balance 8,996,816 $ 8,695,890    
PCI loans        
Financing Receivable Impaired [Line Items]        
Beggining balance of period 146,640 158,174    
Accretion 2,433 2,623    
Collections (3,840) (3,396)    
Foreclosures (790) 2,120    
Ending balance 144,443 155,281    
Allowance for loan losses Purchased Credit Impaired (11,354) (11,251) $ (11,354) $ (11,251)
Ending balance: purchased credit-impaired loans $ 133,089 $ 144,030