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FAIR VALUE - Estimated Fair Value and Carrying Value of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Assets:        
Available-for-sale debt securities (fair value) $ 4,312,884 $ 4,565,302    
Held To Maturity Securities Amortized 312,807 317,786    
Less: allowance for credit losses on held to maturity securities (843) (802)    
Loans held for investment 12,675,398 12,746,556    
Allowance for loan and lease losses (247,269) (243,942) $ (263,592) $ (261,843)
Loans held for investment, net of ACL 12,428,129 12,502,614    
Mortgage servicing rights 24,624 25,019 $ 26,355 $ 26,941
Advances from the FHLB:        
Long-term advances from the FHLB 320,000      
Junior subordinated debentures (amortized cost) 11,143 61,700    
Carrying Reported Amount Fair Value Disclosure [Member]        
Assets:        
Cash and due from banks and money market investments 1,328,275 1,159,415    
Available-for-sale debt securities (fair value) 4,312,884 4,565,302    
Held To Maturity Securities Amortized 312,807 317,786    
Less: allowance for credit losses on held to maturity securities (843) (802)    
Investment securities held to maturity, net of ACL 311,964 316,984    
Equity securities (amortized cost) 39,857 47,132    
Other equity securities 4,956 4,886    
Loans held for sale 14,713 15,276    
Loans held for investment 12,675,398 12,746,556    
Allowance for loan and lease losses (247,269) (243,942)    
Loans held for investment, net of ACL 12,428,129 12,502,614    
Mortgage servicing rights 24,624 25,019    
Derivative Assets 319 318    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 16,822,529 16,871,298    
Advances from the FHLB:        
Long-term advances from the FHLB 320,000 500,000    
Junior subordinated debentures (amortized cost) 11,143 61,700    
Derivative Liabilities 262 150    
Federal Home Loan Bank Stock 26,000 34,000    
Estimate Of Fair Value Fair Value Disclosure [Member]        
Assets:        
Cash and due from banks and money market investments 1,328,275 1,159,415    
Available-for-sale debt securities (fair value) 4,312,884 4,565,302    
Investment securities held to maturity, net of ACL 305,501 308,040    
Equity securities (amortized cost) 39,857 47,132    
Other equity securities 4,956 4,886    
Loans held for sale 14,865 15,276    
Loans held for investment, net of ACL 12,315,996 12,406,405    
Mortgage servicing rights 42,613 43,046    
Derivative Assets 319 318    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 16,821,966 16,872,963    
Advances from the FHLB:        
Long-term advances from the FHLB 321,366 500,128    
Junior subordinated debentures (amortized cost) 11,142 61,752    
Derivative Liabilities 262 150    
Estimate Of Fair Value Fair Value Disclosure [Member] | Fair Value Inputs Level 1 [Member]        
Assets:        
Cash and due from banks and money market investments 1,328,275 1,159,415    
Available-for-sale debt securities (fair value) 19,612 59,189    
Investment securities held to maturity, net of ACL 0 0    
Equity securities (amortized cost) 0 0    
Other equity securities 4,956 4,886    
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    
Junior subordinated debentures (amortized cost) 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 securities (fair value) 4,286,639 4,499,298    
Investment securities held to maturity, net of ACL 209,493 212,432    
Equity securities (amortized cost) 39,857 47,132    
Other equity securities 0 0    
Loans held for sale 14,865 15,276    
Loans held for investment, net of ACL 0 0    
Mortgage servicing rights 0 0    
Derivative Assets 319 318    
Financial Instruments Financial Liabilities Balance Sheet Groupings [Abstract]        
Deposits 16,821,966 16,872,963    
Advances from the FHLB:        
Long-term advances from the FHLB 321,366 500,128    
Junior subordinated debentures (amortized cost) 0 0    
Derivative Liabilities 262 150    
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 (fair value) 6,633 6,815    
Investment securities held to maturity, net of ACL 96,008 95,608    
Equity securities (amortized cost) 0 0    
Other equity securities 0 0    
Loans held for sale 0 0    
Loans held for investment, net of ACL 12,315,996 12,406,405    
Mortgage servicing rights 42,613 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) 11,142 61,752    
Derivative Liabilities $ 0 $ 0