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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Assets:            
Investment securities available for sale (Fair value) $ 6,689,479   $ 4,647,019      
Less: allowance for credit losses on held to held to maturity securities (8,317)   (8,845)      
Total investment securities held to maturity, at amortized cost, net of allowance 169,488   180,643      
Loans, held for investment (amortized cost) 11,100,000          
Less: allowance for loan and lease losses (288,360) $ (324,958) (385,887) $ (384,718) $ (319,297) $ (155,139)
Total 10,852,222   11,391,402      
Liabilities:            
Other borrowings (amortized cost) 183,762   183,762      
Carrying Reported Amount Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments (amortized cost) 2,658,173   1,493,833      
Investment securities available for sale (Fair value) 6,689,479   4,647,019      
Investment securities held to maturity (amortized cost) 177,805   189,488      
Less: allowance for credit losses on held to held to maturity securities (10,685)   (8,845)      
Total investment securities held to maturity, at amortized cost, net of allowance 169,488   180,643      
Equity Securities (fair value) 37,427   37,588      
Loans held for sale (lower of cost or market) 30,681   50,289      
Loans, held for investment (amortized cost) 11,140,582   11,777,289      
Less: allowance for loan and lease losses (288,360)   (385,887)      
Total 10,852,222   11,391,402      
Derivatives, included in assets (fair value) 1,770   2,842      
Liabilities:            
Deposits (amortized cost) 17,984,658   15,317,383      
Securities sold under agreements to repurchase (amortized cost) 300,000   300,000      
Advances from FHLB (amortized cost) 320,000   440,000      
Other borrowings (amortized cost) 183,762   183,762      
Derivatives, included in liabilities (fair value) 1,227   1,920      
Estimate Of Fair Value Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments (amortized cost) 2,658,173   1,493,833      
Investment securities available for sale (Fair value) 6,689,479   4,647,019      
Total investment securities held to maturity, at amortized cost, net of allowance 170,438   173,806      
Equity Securities (fair value) 37,427   37,588      
Loans held for sale (lower of cost or market) 31,607   52,322      
Total 11,021,304   11,564,635      
Derivatives, included in assets (fair value) 1,770   2,842      
Liabilities:            
Deposits (amortized cost) 18,013,613   15,363,236      
Securities sold under agreements to repurchase (amortized cost) 322,555   329,493      
Advances from FHLB (amortized cost) 324,992   446,703      
Other borrowings (amortized cost) 149,246   151,645      
Derivatives, included in liabilities (fair value) 1,227   1,920      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]            
Assets:            
Cash and due from banks and money market investments (amortized cost) 2,658,173   1,493,833      
Investment securities available for sale (Fair value) 87,887   7,507      
Total investment securities held to maturity, at amortized cost, net of allowance 0   0      
Equity Securities (fair value) 5,436   1,474      
Loans held for sale (lower of cost or market) 0   0      
Total 0   0      
Derivatives, included in assets (fair value) 0   0      
Liabilities:            
Deposits (amortized cost) 0   0      
Securities sold under agreements to repurchase (amortized cost) 0   0      
Advances from FHLB (amortized cost) 0   0      
Other borrowings (amortized cost) 0   0      
Derivatives, included in liabilities (fair value) 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 (amortized cost) 0   0      
Investment securities available for sale (Fair value) 6,590,124   4,627,535      
Total investment securities held to maturity, at amortized cost, net of allowance 0   0      
Equity Securities (fair value) 31,991   36,114      
Loans held for sale (lower of cost or market) 31,607   52,322      
Total 0   0      
Derivatives, included in assets (fair value) 1,770   2,842      
Liabilities:            
Deposits (amortized cost) 18,013,613   15,363,236      
Securities sold under agreements to repurchase (amortized cost) 322,555   329,493      
Advances from FHLB (amortized cost) 324,992   446,703      
Other borrowings (amortized cost) 0   0      
Derivatives, included in liabilities (fair value) 1,227   1,920      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 3 [Member]            
Assets:            
Cash and due from banks and money market investments (amortized cost) 0   0      
Investment securities available for sale (Fair value) 11,468   11,977      
Total investment securities held to maturity, at amortized cost, net of allowance 170,438   173,806      
Equity Securities (fair value) 0   0      
Loans held for sale (lower of cost or market) 0   0      
Total 11,021,304   11,564,635      
Derivatives, included in assets (fair value) 0   0      
Liabilities:            
Deposits (amortized cost) 0   0      
Securities sold under agreements to repurchase (amortized cost) 0   0      
Advances from FHLB (amortized cost) 0   0      
Other borrowings (amortized cost) 149,246   151,645      
Derivatives, included in liabilities (fair value) $ 0   $ 0