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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Dec. 31, 2016
Assets:            
Investment securities available for sale $ 2,011,221   $ 1,891,016      
Held To Maturity Securities 144,799   150,627      
Total gross loans held for investment portfolio 8,716,953   8,850,476 $ 8,877,214    
Less: allowance for loan and lease losses (200,563) $ (222,035) (231,843) $ (230,870) $ (173,485) $ (205,603)
Loans held for investment, net 8,516,390   8,618,633      
Liabilities:            
Other borrowings 184,150   208,635      
Carrying Reported Amount Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 656,772   716,395      
Investment securities available for sale 2,011,221   1,891,016      
Held To Maturity Securities 144,799   150,627      
Equity Securities 42,274          
Other investment securities 0   43,119      
Loans held for sale 65,739   32,980      
Total gross loans held for investment portfolio 8,716,953   8,850,476      
Less: allowance for loan and lease losses (200,563)   (231,843)      
Loans held for investment, net 8,516,390   8,618,633      
Asset Derivative 931   312      
Liabilities:            
Deposits 9,148,243   9,022,631      
Securities sold under agreements to repurchase 100,000   300,000      
Advances from FHLB 690,000   715,000      
Other borrowings 184,150   208,635      
Liability Derivatives 835   324      
Estimate Of Fair Value Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 656,772   716,395      
Investment securities available for sale 2,011,221   1,891,016      
Held To Maturity Securities 131,703   131,032      
Equity Securities 42,274          
Other investment securities 0   43,119      
Loans held for sale 65,907   34,979      
Loans held for investment, net 8,174,205   8,372,865      
Asset Derivative 931   312      
Liabilities:            
Deposits 9,151,666   9,026,600      
Securities sold under agreements to repurchase 121,047   325,913      
Advances from FHLB 673,788   707,272      
Other borrowings 175,480   189,424      
Liability Derivatives 835   324      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]            
Assets:            
Cash and due from banks and money market investments 656,772   716,395      
Investment securities available for sale 7,426   7,819      
Held To Maturity Securities 0   0      
Equity Securities 411          
Other investment securities 0   0      
Loans held for sale 0   0      
Loans held for investment, net 0   0      
Asset Derivative 0   0      
Liabilities:            
Deposits 0   0      
Securities sold under agreements to repurchase 0   0      
Advances from FHLB 0   0      
Other borrowings 0   0      
Liability Derivatives 0   0      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 2 [Member]            
Assets:            
Cash and due from banks and money market investments 0   0      
Investment securities available for sale 1,985,926   1,863,342      
Held To Maturity Securities 0   0      
Equity Securities 41,863          
Other investment securities 0   43,119      
Loans held for sale 21,730   25,237      
Loans held for investment, net 0   0      
Asset Derivative 931   312      
Liabilities:            
Deposits 9,151,666   9,026,600      
Securities sold under agreements to repurchase 121,047   325,913      
Advances from FHLB 673,788   707,272      
Other borrowings 0   0      
Liability Derivatives 835   324      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 3 [Member]            
Assets:            
Cash and due from banks and money market investments 0   0      
Investment securities available for sale 17,869   19,855      
Held To Maturity Securities 131,703   131,032      
Equity Securities 0          
Other investment securities 0   0      
Loans held for sale 44,177   9,742      
Loans held for investment, net 8,174,205   8,372,865      
Asset Derivative 0   0      
Liabilities:            
Deposits 0   0      
Securities sold under agreements to repurchase 0   0      
Advances from FHLB 0   0      
Other borrowings 175,480   189,424      
Liability Derivatives $ 0   $ 0