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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Assets:    
Investment securities available for sale $ 1,891,016 $ 1,881,920
Less: allowance for loan and lease losses (231,843) (205,603)
Derivatives, included in assets 312 554
Held To Maturity Securities 150,627 156,190
Liabilities:    
Other borrowings 208,635 216,187
Derivatives, included in liabilities 324 753
Carrying Reported Amount Fair Value Disclosure [Member]    
Assets:    
Cash and due from banks and money market investments 716,395 299,685
Investment securities available for sale 1,891,016 1,881,920
Other equity securities 43,119 42,992
Loans held for sale 32,980 50,006
Loans, held for investment 8,850,476 8,886,873
Less: allowance for loan and lease losses (231,843) (205,603)
Loans held for investment, net of allowance 8,618,633 8,681,270
Derivatives, included in assets 312 554
Held To Maturity Securities 150,627 156,190
Liabilities:    
Deposits 9,022,631 8,831,205
Securities sold under agreements to repurchase 300,000 300,000
Advances from FHLB 715,000 670,000
Other borrowings 208,635 216,187
Derivatives, included in liabilities 324 753
Estimate Of Fair Value Fair Value Disclosure [Member]    
Assets:    
Cash and due from banks and money market investments 716,395 299,685
Investment securities available for sale 1,891,016 1,881,920
Other equity securities 43,119 42,992
Loans held for sale 34,979 52,707
Loans held for investment, net of allowance 8,372,865 8,455,104
Derivatives, included in assets 312 554
Held To Maturity Securities 131,032 132,759
Liabilities:    
Deposits 9,026,600 8,838,606
Securities sold under agreements to repurchase 325,913 335,840
Advances from FHLB 707,272 669,687
Other borrowings 189,424 171,374
Derivatives, included in liabilities 324 753
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]    
Assets:    
Cash and due from banks and money market investments 716,395 299,685
Investment securities available for sale 7,819 7,917
Other equity securities 0 0
Loans held for sale 0 0
Loans held for investment, net of allowance 0 0
Derivatives, included in assets 0 0
Held To Maturity Securities 0 0
Liabilities:    
Deposits 0 0
Securities sold under agreements to repurchase 0 0
Advances from FHLB 0 0
Other borrowings 0 0
Derivatives, included in liabilities 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 1,863,342 1,851,089
Other equity securities 43,119 42,992
Loans held for sale 25,237 42,921
Loans held for investment, net of allowance 0 0
Derivatives, included in assets 312 554
Held To Maturity Securities 0 0
Liabilities:    
Deposits 9,026,600 8,838,606
Securities sold under agreements to repurchase 325,913 335,840
Advances from FHLB 707,272 669,687
Other borrowings 0 0
Derivatives, included in liabilities 324 753
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 19,855 22,914
Other equity securities 0 0
Loans held for sale 9,742 9,786
Loans held for investment, net of allowance 8,372,865 8,455,104
Derivatives, included in assets 0 0
Held To Maturity Securities 131,032 132,759
Liabilities:    
Deposits 0 0
Securities sold under agreements to repurchase 0 0
Advances from FHLB 0 0
Other borrowings 189,424 171,374
Derivatives, included in liabilities $ 0 $ 0