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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Assets:            
Available-for-sale debt securitie (fair value) $ 4,894,781   $ 5,229,984      
Held To Maturity Securities Amortized 323,142   354,178      
Less: allowance for credit losses on held to maturity securities (1,119)   (2,197)      
Loans held for investment 12,446,024   12,185,483      
Allowance for loan and lease losses (246,996) $ (254,532) (261,843) $ (263,615) $ (267,058) $ (260,464)
Loans held for investment, net of ACL 12,199,028   11,923,640      
Mortgage servicing rights 25,403 $ 25,952 26,941 $ 27,601 $ 28,034 $ 29,037
Advances from the FHLB:            
Long-term advances from the FHLB 500,000   500,000      
Other long-term borrowings 111,700   161,700      
Carrying Reported Amount Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 685,371   663,164      
Available-for-sale debt securitie (fair value) 4,894,781   5,229,984      
Held To Maturity Securities Amortized 323,142   354,178      
Less: allowance for credit losses on held to maturity securities (1,119)   (2,197)      
Investment securities held to maturity, net of ACL 322,023   351,981      
Equity securities (amortized cost) 47,420   44,782      
Other equity securities 5,012   4,893      
Loans held for sale 12,641   7,368      
Loans held for investment 12,446,024   12,185,483      
Allowance for loan and lease losses (246,996)   (261,843)      
Loans held for investment, net of ACL 12,199,028   11,923,640      
Mortgage servicing rights 25,403   26,941      
Derivative Assets 322   341      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,347,390   16,555,985      
Advances from the FHLB:            
Long-term advances from the FHLB 500,000   500,000      
Other long-term borrowings 111,700   161,700      
Derivative Liabilities 392   317      
Federal Home Loan Bank Stock 34,000   34,600      
Estimate Of Fair Value Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 685,371   663,164      
Available-for-sale debt securitie (fair value) 4,894,781   5,229,984      
Investment securities held to maturity, net of ACL 316,854   346,132      
Equity securities (amortized cost) 47,420   44,782      
Other equity securities 5,012   4,893      
Loans held for sale 12,729   7,476      
Loans held for investment, net of ACL 12,100,106   11,762,855      
Mortgage servicing rights 42,416   45,244      
Derivative Assets 322   341      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,358,466   16,565,435      
Advances from the FHLB:            
Long-term advances from the FHLB 503,960   500,522      
Other long-term borrowings 113,088   159,999      
Derivative Liabilities 392   317      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]            
Assets:            
Cash and due from banks and money market investments 685,371   663,164      
Available-for-sale debt securitie (fair value) 98,612   135,393      
Investment securities held to maturity, net of ACL 0   0      
Equity securities (amortized cost) 0   0      
Other equity securities 5,012   4,893      
Loans held for sale 0   0      
Loans held for investment, net of ACL 0   0      
Mortgage servicing rights 0   0      
Derivative Assets 0   0      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 0   0      
Advances from the FHLB:            
Long-term advances from the FHLB 0   0      
Other long-term borrowings 0   0      
Derivative 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      
Available-for-sale debt securitie (fair value) 4,789,281   5,088,391      
Investment securities held to maturity, net of ACL 222,248   235,239      
Equity securities (amortized cost) 47,420   44,782      
Other equity securities 0   0      
Loans held for sale 12,729   7,476      
Loans held for investment, net of ACL 0   0      
Mortgage servicing rights 0   0      
Derivative Assets 322   341      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,358,466   16,565,435      
Advances from the FHLB:            
Long-term advances from the FHLB 503,960   500,522      
Other long-term borrowings 0   0      
Derivative Liabilities 392   317      
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      
Available-for-sale debt securitie (fair value) 6,888   6,200      
Investment securities held to maturity, net of ACL 94,606   110,893      
Equity securities (amortized cost) 0   0      
Other equity securities 0   0      
Loans held for sale 0   0      
Loans held for investment, net of ACL 12,100,106   11,762,855      
Mortgage servicing rights 42,416   45,244      
Derivative Assets 0   0      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 0   0      
Advances from the FHLB:            
Long-term advances from the FHLB 0   0      
Other long-term borrowings 113,088   159,999      
Derivative Liabilities $ 0   $ 0