v3.25.3
Fair Value Disclosures - Schedule of Assets and Liabilities Measured At Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities $ 3,801,261 $ 3,524,686
Equity securities 55,054 75,261
Trading securities 2,219 0
Derivative assets 37,297 23,202
Derivative liabilities 24,264 57,906
U.S. Treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities   277,285
Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 3,544,015 3,034,043
Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 246,253 201,432
Credit risk transfer securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 10,993 11,926
Fair value measurements, recurring basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 45,054 59,235
Trading securities 0  
Loans held for investment 0 0
Derivative assets 0 0
Securities sold not yet purchased 24,730 33,705
Derivative liabilities 0 0
Non-qualified deferred compensation plan liabilities 18,540 19,109
Fair value measurements, recurring basis | Level 1 | U.S. Treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities   277,285
Fair value measurements, recurring basis | 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
Fair value measurements, recurring basis | 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
Fair value measurements, recurring basis | 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
Fair value measurements, recurring basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 10,000 16,026
Trading securities 2,219  
Loans held for investment 0 0
Derivative assets 37,297 23,202
Securities sold not yet purchased 0 0
Derivative liabilities 24,264 57,906
Non-qualified deferred compensation plan liabilities 0 0
Fair value measurements, recurring basis | Level 2 | U.S. Treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities   0
Fair value measurements, recurring basis | Level 2 | Residential mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 3,544,015 3,034,043
Fair value measurements, recurring basis | Level 2 | Commercial mortgage-backed securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities 246,253 201,432
Fair value measurements, recurring basis | 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
Fair value measurements, recurring basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity securities 0 0
Trading securities 0  
Loans held for investment 21,057 35,318
Derivative assets 0 0
Securities sold not yet purchased 0 0
Derivative liabilities 0 0
Non-qualified deferred compensation plan liabilities 0 0
Fair value measurements, recurring basis | Level 3 | U.S. Treasury securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities   0
Fair value measurements, recurring basis | 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
Fair value measurements, recurring basis | 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
Fair value measurements, recurring basis | Level 3 | Credit risk transfer securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Available-for-sale debt securities $ 10,993 $ 11,926