v3.26.3
Fair Value Disclosures - Schedule of Assets and Liabilities Measured At Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities $ 4,095,855 $ 3,951,455
Equity securities 42,007 41,998
Trading debt securities 0 3,924
Derivative assets 14,461 40,892
Derivative liabilities 140,096 24,458
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 3,850,217 3,692,646
Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 235,519 248,012
Credit risk transfer securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 10,119 10,797
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 32,007 31,998
Trading debt securities   0
Loans held for investment 0 0
Derivative assets 0 0
Other trading assets 40  
Securities sold not yet purchased 12,297 12,026
Derivative liabilities 0 0
Non-qualified deferred compensation plan liabilities 18,015 18,989
Level 1 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0 0
Level 1 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0 0
Level 1 | Credit risk transfer securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 10,000 10,000
Trading debt securities   3,924
Loans held for investment 0 0
Derivative assets 14,461 40,892
Other trading assets 0  
Securities sold not yet purchased 0 0
Derivative liabilities 140,096 24,458
Non-qualified deferred compensation plan liabilities 0 0
Level 2 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 3,850,217 3,692,646
Level 2 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 235,519 248,012
Level 2 | Credit risk transfer securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0 0
Trading debt securities   0
Loans held for investment 26,865 20,844
Derivative assets 0 0
Other trading assets 0  
Securities sold not yet purchased 0 0
Derivative liabilities 0 0
Non-qualified deferred compensation plan liabilities 0 0
Level 3 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0 0
Level 3 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 0 0
Level 3 | Credit risk transfer securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities $ 10,119 $ 10,797