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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Carrying Reported Amount Fair Value Disclosure [Member]    
Assets:    
Cash and due from banks and money market investments $ 2,469,507 $ 644,099
Investment securities available for sale 3,294,649 2,123,525
Held To Maturity Securities 189,156  
Less: allowance for credit losses (10,176)  
Held To Maturity Securities Net Of Allowance For Credit Losses 178,980 138,675
Equity securities 39,290 38,249
Loans held for sale 48,670 39,477
Total gross loans held for investment portfolio 11,847,275 9,002,205
Less: allowance for credit losses (384,718) (155,139)
Loans held for investment, net 11,462,557 8,847,066
Asset Derivative 3,098 372
Liabilities:    
Deposits 15,202,898 9,348,429
Securities sold under agreements to repurchase 300,000 100,000
Advances from FHLB 490,000 570,000
Other borrowings 183,762 184,150
Liability Derivatives 1,821 149
Estimate Of Fair Value Fair Value Disclosure [Member]    
Assets:    
Cash and due from banks and money market investments 2,469,507 644,099
Investment securities available for sale 3,294,649 2,123,525
Held To Maturity Securities Net Of Allowance For Credit Losses 166,974 110,374
Equity securities 39,290 38,249
Loans held for sale 50,518 40,234
Loans held for investment, net 11,502,824 8,715,144
Asset Derivative 3,098 372
Liabilities:    
Deposits 15,243,104 9,372,591
Securities sold under agreements to repurchase 330,551 120,020
Advances from FHLB 498,322 578,498
Other borrowings 143,785 180,577
Liability Derivatives 1,821 149
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]    
Assets:    
Cash and due from banks and money market investments 2,469,507 644,099
Investment securities available for sale 7,531 7,479
Held To Maturity Securities Net Of Allowance For Credit Losses 0 0
Equity securities 1,475 1,428
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 3,274,722 2,101,456
Held To Maturity Securities Net Of Allowance For Credit Losses 0 0
Equity securities 37,815 36,821
Loans held for sale 50,518 40,234
Loans held for investment, net 0 0
Asset Derivative 3,098 372
Liabilities:    
Deposits 15,243,104 9,372,591
Securities sold under agreements to repurchase 330,551 120,020
Advances from FHLB 498,322 578,498
Other borrowings 0 0
Liability Derivatives 1,821 149
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 12,396 14,590
Held To Maturity Securities Net Of Allowance For Credit Losses 166,974 110,374
Equity securities 0 0
Loans held for sale 0 0
Loans held for investment, net 11,502,824 8,715,144
Asset Derivative 0 0
Liabilities:    
Deposits 0 0
Securities sold under agreements to repurchase 0 0
Advances from FHLB 0 0
Other borrowings 143,785 180,577
Liability Derivatives $ 0 $ 0