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LOANS HELD FOR INVESTMENT - Loan Portfolio Held for Investment (Detail) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Allowance for credit losses on loans and finance leases $ 292,774 $ 155,139 $ 183,732 $ 196,362
Loans held for investment, net 8,758,219 8,886,543    
Residential Portfolio Segment [Member]        
Allowance for credit losses on loans and finance leases 107,082 44,806 51,886 50,794
Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member]        
Allowance for credit losses on loans and finance leases 38,310 15,198 22,321 32,546
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Allowance for credit losses on loans and finance leases 33,971 39,194 53,430 55,581
Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Allowance for credit losses on loans and finance leases 5,253 2,370 3,331 3,592
Consumer Portfolio Segment [Member]        
Allowance for credit losses on loans and finance leases 108,158 53,571 $ 52,764 $ 53,849
Loans held for investmet [Member]        
Financing Receivable, before Allowance for Credit Loss 9,038,947 9,002,205    
Allowance for credit losses on loans and finance leases 292,774 155,139    
Loans held for investment, net 8,746,173 8,847,066    
Loans held for investmet [Member] | Residential Portfolio Segment [Member]        
Financing Receivable, before Allowance for Credit Loss 2,875,672 2,933,773    
Loans held for investmet [Member] | Commercial Portfolio Segment [Member] | Commercial and Industrial loans [Member]        
Financing Receivable, before Allowance for Credit Loss 2,236,218 2,230,876    
Loans held for investmet [Member] | Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]        
Financing Receivable, before Allowance for Credit Loss 1,454,753 1,444,586    
Loans held for investmet [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member]        
Financing Receivable, before Allowance for Credit Loss 159,675 111,317    
Loans held for investmet [Member] | Consumer Portfolio Segment [Member]        
Financing Receivable, before Allowance for Credit Loss $ 2,312,629 $ 2,281,653