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FAIR VALUE - Estimated Fair Value and Carrying Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Assets:            
Available-for-sale debt securities $ 4,598,303   $ 4,565,302      
Held-to-maturity debt securities 273,363   317,786      
Less: ACL on held-to-maturity debt securities (698)   (802)      
Loans held for investment 13,048,684   12,746,556      
Allowance for loan and lease losses (246,990) $ (248,578) (243,942) $ (246,996) $ (254,532) $ (261,843)
Loans held for investment, net 12,801,694   12,502,614      
Mortgage servicing rights 23,659 $ 24,130 25,019 $ 25,403 $ 25,952 $ 26,941
Advances from the FHLB:            
Junior subordinated debentures (amortized cost) 0   61,700      
Carrying Reported Amount Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 899,570   1,159,415      
Available-for-sale debt securities 4,598,303   4,565,302      
Held-to-maturity debt securities 273,363   317,786      
Less: ACL on held-to-maturity debt securities (698)   (802)      
Held-to-maturity debt securities, net of ACL 272,665   316,984      
Equity securities (amortized cost) 39,381   47,132      
Other equity securities 5,009   4,886      
Loans held for sale 12,546   15,276      
Loans held for investment 13,048,684   12,746,556      
Allowance for loan and lease losses (246,990)   (243,942)      
Loans held for investment, net 12,801,694   12,502,614      
Mortgage servicing rights 23,659   25,019      
Derivative Assets 332   318      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,861,047   16,871,298      
Advances from the FHLB:            
Long-term advances from the FHLB 290,000   500,000      
Junior subordinated debentures (amortized cost)     61,700      
Derivative Liabilities 264   150      
Federal Home Loan Bank Stock 24,700   34,000      
Estimate Of Fair Value Fair Value Disclosure [Member]            
Assets:            
Cash and due from banks and money market investments 899,570   1,159,415      
Available-for-sale debt securities 4,598,303   4,565,302      
Held-to-maturity debt securities, net of ACL 269,253   308,040      
Equity securities (amortized cost) 39,381   47,132      
Other equity securities 5,009   4,886      
Loans held for sale 12,793   15,276      
Loans held for investment, net 12,700,160   12,406,405      
Mortgage servicing rights 41,710   43,046      
Derivative Assets 332   318      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,864,154   16,872,963      
Advances from the FHLB:            
Long-term advances from the FHLB 292,473   500,128      
Junior subordinated debentures (amortized cost)     61,752      
Derivative Liabilities 264   150      
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]            
Assets:            
Cash and due from banks and money market investments 899,570   1,159,415      
Available-for-sale debt securities 496,803   59,189      
Held-to-maturity debt securities, net of ACL 0   0      
Equity securities (amortized cost) 0   0      
Other equity securities 5,009   4,886      
Loans held for sale 0   0      
Loans held for investment, net 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      
Junior subordinated debentures (amortized cost)     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 securities 4,096,089   4,499,298      
Held-to-maturity debt securities, net of ACL 184,070   212,432      
Equity securities (amortized cost) 39,381   47,132      
Other equity securities 0   0      
Loans held for sale 12,793   15,276      
Loans held for investment, net 0   0      
Mortgage servicing rights 0   0      
Derivative Assets 332   318      
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]            
Deposits 16,864,154   16,872,963      
Advances from the FHLB:            
Long-term advances from the FHLB 292,473   500,128      
Junior subordinated debentures (amortized cost)     0      
Derivative Liabilities 264   150      
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 securities 5,411   6,815      
Held-to-maturity debt securities, net of ACL 85,183   95,608      
Equity securities (amortized cost) 0   0      
Other equity securities 0   0      
Loans held for sale 0   0      
Loans held for investment, net 12,700,160   12,406,405      
Mortgage servicing rights 41,710   43,046      
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      
Junior subordinated debentures (amortized cost)     61,752      
Derivative Liabilities $ 0   $ 0