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LOANS HELD FOR SALE - Portfolio of Loans Held For Sale Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable Held For Sale Net $ 43,186 $ 32,980  
Loans held for investment transferred to held for sale 90,319 0 $ 10,332
Nonperforming Financial Instruments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value write-downs 22,200    
Loans Receivable Held For Sale Net 16,100 8,300  
Loans held for investment transferred to held for sale 74,400    
Commercial And Industrial Sector [Member] | Nonperforming Financial Instruments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value write-downs 1,700    
Loans held for investment transferred to held for sale 1,800    
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable Held For Sale Net 11,371 0  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable Held For Sale Net 1,725 0  
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Nonperforming Financial Instruments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable Held For Sale Net 1,700    
Construction Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable Held For Sale Net 3,015 $ 8,290  
Construction Loans [Member] | Nonperforming Financial Instruments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Fair value write-downs 6,700    
Loans held for investment transferred to held for sale 33,000    
Construction Loans [Member] | Nonperforming Financial Instruments [Member] | Loans held for sale sold [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans held for investment transferred to held for sale 30,000    
Construction Loans [Member] | Commercial Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Receivable Held For Sale Net $ 3,000