v3.26.3
Fair Value of Financial Instruments - Schedule of Estimated Fair Values and Carrying Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Financial assets:    
Net loans HFI $ 12,985,604 $ 12,197,643
Interest receivable $ 60,369 $ 58,565
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other assets Other assets
Financial liabilities:    
Derivative Liability, Statement of Financial Position [Extensible Enumeration] Accrued expenses and other liabilities Accrued expenses and other liabilities
Carrying amount    
Financial assets:    
Cash and cash equivalents $ 1,017,689 $ 1,155,895
Investment securities 1,543,889 1,459,734
Net loans HFI 12,985,604 12,197,643
Loans held for sale, at fair value 225,935 172,974
Interest receivable 60,369 58,565
Mortgage servicing rights 150,873 148,795
Derivatives 35,686 24,316
Financial liabilities:    
Without stated maturities 11,663,440 11,255,404
With stated maturities 3,002,556 2,654,557
Securities sold under agreements to repurchase and federal funds purchased 27,484 99,865
Subordinated debt, net 207,722 83,670
Interest payable 24,550 21,549
Derivatives 31,838 23,509
 Fair Value    
Financial assets:    
Cash and cash equivalents 1,017,689 1,155,895
Investment securities 1,543,889 1,459,734
Net loans HFI 12,884,630 12,155,340
Loans held for sale, at fair value 225,935 172,974
Interest receivable 60,369 58,565
Mortgage servicing rights 150,873 148,795
Derivatives 35,686 24,316
Financial liabilities:    
Without stated maturities 11,663,440 11,255,404
With stated maturities 2,997,977 2,655,532
Securities sold under agreements to repurchase and federal funds purchased 27,484 99,865
Subordinated debt, net 210,287 88,281
Interest payable 24,550 21,549
Derivatives 31,838 23,509
 Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 1,017,689 1,155,895
Investment securities 5,759 0
Net loans HFI 0 0
Loans held for sale, at fair value 0 0
Interest receivable 605 463
Mortgage servicing rights 0 0
Derivatives 0 0
Financial liabilities:    
Without stated maturities 11,663,440 11,255,404
With stated maturities 0 0
Securities sold under agreements to repurchase and federal funds purchased 27,484 99,865
Subordinated debt, net 0 0
Interest payable 3,160 3,677
Derivatives 0 0
 Fair Value | Level 2    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities 1,538,130 1,459,734
Net loans HFI 0 0
Loans held for sale, at fair value 225,935 172,974
Interest receivable 8,877 7,962
Mortgage servicing rights 0 0
Derivatives 35,686 24,316
Financial liabilities:    
Without stated maturities 0 0
With stated maturities 2,997,977 2,655,532
Securities sold under agreements to repurchase and federal funds purchased 0 0
Subordinated debt, net 0 0
Interest payable 21,229 17,872
Derivatives 31,838 23,509
 Fair Value | Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities 0 0
Net loans HFI 12,884,630 12,155,340
Loans held for sale, at fair value 0 0
Interest receivable 50,887 50,140
Mortgage servicing rights 150,873 148,795
Derivatives 0 0
Financial liabilities:    
Without stated maturities 0 0
With stated maturities 0 0
Securities sold under agreements to repurchase and federal funds purchased 0 0
Subordinated debt, net 210,287 88,281
Interest payable 161 0
Derivatives $ 0 $ 0