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FAIR VALUE - Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Assets:            
Available-for-sale debt securitie (fair value) $ 4,957,311   $ 5,229,984      
Held To Maturity Securities Amortized 344,435   354,178      
Less: allowance for credit losses on held to maturity securities (1,267)   (2,197)      
Loans held for investment 12,385,508   12,185,483      
Allowance for loan and lease losses (254,532) $ (263,592) (261,843) $ (267,058) $ (265,567) $ (260,464)
Loans held for investment, net of ACL 12,130,976   11,923,640      
Mortgage servicing rights 25,952 $ 26,355 26,941 $ 28,034 $ 28,431 $ 29,037
Advances from the FHLB:            
Long-term advances from the FHLB 500,000   500,000      
Other long-term borrowings 161,700   161,700      
Carrying Reported Amount Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 586,282   663,164      
Available-for-sale debt securitie (fair value) 4,957,311   5,229,984      
Held To Maturity Securities Amortized 344,435   354,178      
Less: allowance for credit losses on held to maturity securities (1,267)   (2,197)      
Investment securities held to maturity, net of ACL 343,168   351,981      
Equity securities (amortized cost) 46,170   44,782      
Other equity securities 4,867   4,893      
Loans held for sale 10,392   7,368      
Loans held for investment 12,385,508   12,185,483      
Allowance for loan and lease losses (254,532)   (261,843)      
Loans held for investment, net of ACL 12,130,976   11,923,640      
Mortgage servicing rights 25,952   26,941      
Derivative Assets 316   341      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,528,956   16,555,985      
Advances from the FHLB:            
Long-term advances from the FHLB 500,000   500,000      
Other long-term borrowings 161,700   161,700      
Derivative Liabilities 152   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 586,282   663,164      
Available-for-sale debt securitie (fair value) 4,957,311   5,229,984      
Investment securities held to maturity, net of ACL 333,690   346,132      
Equity securities (amortized cost) 46,170   44,782      
Other equity securities 4,867   4,893      
Loans held for sale 10,450   7,476      
Loans held for investment, net of ACL 12,058,472   11,762,855      
Mortgage servicing rights 44,590   45,244      
Derivative Assets 316   341      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,521,923   16,565,435      
Advances from the FHLB:            
Long-term advances from the FHLB 495,838   500,522      
Other long-term borrowings 159,696   159,999      
Derivative Liabilities 152   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 586,282   663,164      
Available-for-sale debt securitie (fair value) 117,073   135,393      
Investment securities held to maturity, net of ACL 0   0      
Equity securities (amortized cost) 0   0      
Other equity securities 4,867   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) 4,833,139   5,088,391      
Investment securities held to maturity, net of ACL 222,364   235,239      
Equity securities (amortized cost) 46,170   44,782      
Other equity securities 0   0      
Loans held for sale 10,450   7,476      
Loans held for investment, net of ACL 0   0      
Mortgage servicing rights 0   0      
Derivative Assets 316   341      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,521,923   16,565,435      
Advances from the FHLB:            
Long-term advances from the FHLB 495,838   500,522      
Other long-term borrowings 0   0      
Derivative Liabilities 152   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) 7,099   6,200      
Investment securities held to maturity, net of ACL 111,326   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 12,058,472   11,762,855      
Mortgage servicing rights 44,590   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 159,696   159,999      
Derivative Liabilities $ 0   $ 0