v3.26.3
Fair Value of Assets and Liabilities - Schedule of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Jun. 30, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 7,569,498   $ 6,236,263 $ 5,274,124    
Equity securities with readily determinable fair value 64,811   63,770 63,445    
Loans held-for-investment 145,750     129,593    
MSRs 238,485 $ 201,903 195,023 190,938 $ 193,061 $ 203,788
U.S. Treasury            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 3,000   7,035 8,036    
U.S. government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 43,831   47,471 46,511    
Municipal            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 164,324   162,166 194,244    
Measured at fair value on a recurring basis:            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities with readily determinable fair value 64,811   63,770 63,445    
Mortgage loans held-for-sale 307,748   340,745 333,883    
Loans held-for-investment 145,750   151,590 129,593    
MSRs 238,485   195,023 190,938    
Nonqualified deferred compensation assets 18,867   18,112 17,902    
Derivative assets 205,591   179,667 208,957    
Total 8,550,750   7,185,170 6,218,842    
Derivative liabilities 375,745   123,774 141,705    
Measured at fair value on a recurring basis: | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities with readily determinable fair value 56,745   55,704 55,379    
Mortgage loans held-for-sale 0   0 0    
Loans held-for-investment 0   0 0    
MSRs 0   0 0    
Nonqualified deferred compensation assets 0   0 0    
Derivative assets 0   0 0    
Total 59,745   62,739 63,415    
Derivative liabilities 0   0 0    
Measured at fair value on a recurring basis: | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities with readily determinable fair value 8,066   8,066 8,066    
Mortgage loans held-for-sale 255,022   286,931 279,157    
Loans held-for-investment 95,227   95,390 80,373    
MSRs 0   0 0    
Nonqualified deferred compensation assets 18,867   18,112 17,902    
Derivative assets 204,775   176,251 201,808    
Total 8,028,779   6,714,375 5,723,600    
Derivative liabilities 375,745   123,774 141,705    
Measured at fair value on a recurring basis: | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Equity securities with readily determinable fair value 0   0 0    
Mortgage loans held-for-sale 52,726   53,814 54,726    
Loans held-for-investment 50,523   56,200 49,220    
MSRs 238,485   195,023 190,938    
Nonqualified deferred compensation assets 0   0 0    
Derivative assets 816   3,416 7,149    
Total 462,226   408,056 431,827    
Derivative liabilities 0   0 0    
Measured at fair value on a recurring basis: | U.S. Treasury            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 3,000   7,035 8,036    
Measured at fair value on a recurring basis: | U.S. Treasury | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 3,000   7,035 8,036    
Measured at fair value on a recurring basis: | U.S. Treasury | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | U.S. Treasury | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | U.S. government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 43,831   47,471 46,511    
Measured at fair value on a recurring basis: | U.S. government agencies | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | U.S. government agencies | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 43,831   47,471 46,511    
Measured at fair value on a recurring basis: | U.S. government agencies | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | Municipal            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 164,324   162,166 194,244    
Measured at fair value on a recurring basis: | Municipal | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | Municipal | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 44,648   62,563 64,450    
Measured at fair value on a recurring basis: | Municipal | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 119,676   99,603 129,794    
Measured at fair value on a recurring basis: | Corporate notes            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 74,018   77,295 80,372    
Measured at fair value on a recurring basis: | Corporate notes | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | Corporate notes | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 74,018   77,295 80,372    
Measured at fair value on a recurring basis: | Corporate notes | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | Mortgage-backed            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7,284,325   5,942,296 4,944,961    
Measured at fair value on a recurring basis: | Mortgage-backed | Level 1            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   0 0    
Measured at fair value on a recurring basis: | Mortgage-backed | Level 2            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 7,284,325   5,942,296 4,944,961    
Measured at fair value on a recurring basis: | Mortgage-backed | Level 3            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 0   $ 0 $ 0