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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Assets:      
Investment securities available for sale $ 1,815,504 $ 1,891,016  
Held To Maturity Securities   150,627  
Other equity securities 400    
Less: allowance for loan and lease losses (225,856) (231,843)  
Liabilities:      
Other borrowings 184,150 208,635  
Fair Value Inputs Level 1 [Member]      
Assets:      
Other investments 413    
Fair Value Inputs Level 2 [Member]      
Assets:      
Other investments 0    
Fair Value Inputs Level 3 [Member]      
Assets:      
Loans held for investment, net of allowance [1]     $ 430,162
Other investments 0    
Carrying Reported Amount Fair Value Disclosure [Member]      
Assets:      
Cash and due from banks and money market investments 843,824 716,395  
Investment securities available for sale 1,815,504 1,891,016  
Held To Maturity Securities 150,486 150,627  
Other equity securities 43,119 43,119  
Loans held for sale 91,375 32,980  
Loans, held for investment 8,695,890 8,850,476  
Less: allowance for loan and lease losses (225,856) (231,843)  
Loans held for investment, net of allowance 8,470,034 8,618,633  
Derivatives, included in assets 668 312  
Other investments 413    
Liabilities:      
Deposits 9,066,465 9,022,631  
Securities sold under agreements to repurchase 200,000 300,000  
Advances from FHLB 715,000 715,000  
Other borrowings 184,150 208,635  
Derivatives, included in liabilities 735 324  
Estimate Of Fair Value Fair Value Disclosure [Member]      
Assets:      
Cash and due from banks and money market investments 843,824 716,395  
Investment securities available for sale 1,815,504 1,891,016  
Held To Maturity Securities 134,856 131,032  
Other equity securities 43,119 43,119  
Loans held for sale 91,736 34,979  
Loans held for investment, net of allowance 8,262,128 8,372,865  
Derivatives, included in assets 668 312  
Other investments 413    
Liabilities:      
Deposits 9,070,024 9,026,600  
Securities sold under agreements to repurchase 226,076 325,913  
Advances from FHLB 701,079 707,272  
Other borrowings 171,378 189,424  
Derivatives, included in liabilities 735 324  
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]      
Assets:      
Cash and due from banks and money market investments 843,824 716,395  
Investment securities available for sale 57,169 7,819  
Held To Maturity Securities 0 0  
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  
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 1,739,527 1,863,342  
Held To Maturity Securities 0 0  
Other equity securities 43,119 43,119  
Loans held for sale 26,791 25,237  
Loans held for investment, net of allowance 0 0  
Derivatives, included in assets 668 312  
Liabilities:      
Deposits 9,070,024 9,026,600  
Securities sold under agreements to repurchase 226,076 325,913  
Advances from FHLB 701,079 707,272  
Other borrowings 0 0  
Derivatives, included in liabilities 735 324  
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 18,808 19,855  
Held To Maturity Securities 134,856 131,032  
Other equity securities 0 0  
Loans held for sale 64,945 9,742  
Loans held for investment, net of allowance 8,262,128 8,372,865  
Derivatives, included in assets 0 0  
Liabilities:      
Deposits 0 0  
Securities sold under agreements to repurchase 0 0  
Advances from FHLB 0 0  
Other borrowings 171,378 189,424  
Derivatives, included in liabilities $ 0 $ 0  
[1]
Consists mainly of impaired commercial and construction loans. The impairments were generally measured based on the fair value of the underlying collateral. The fair values were derived from external appraisals that take into consideration prices in observed transactions involving similar assets in similar locations but adjusted for specific characteristics and assumptions of the collateral (e.g., absorption rates), which are not market observable.