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Fair Values of Assets and Liabilities - Schedule of Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities $ 6,236,263 $ 4,141,482    
Equity securities with readily determinable fair value 63,770 215,412    
Loans held-for-investment 151,590 158,795    
MSRs 195,023 203,788 $ 192,456 $ 230,225
U.S. Treasury        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 7,035 37,907    
U.S. government agencies        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 47,471 44,945    
Municipal securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 162,166 184,593    
Measured at fair value on a recurring basis:        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   4,072    
Equity securities with readily determinable fair value 63,770 215,412    
Mortgage loans held-for-sale 340,745 331,261    
Loans held-for-investment 151,590 158,795    
MSRs 195,023 203,788    
Nonqualified deferred compensation assets 18,112 16,653    
Derivative assets 179,667 200,027    
Total financial assets 7,185,170 5,271,490    
Derivative liabilities 123,774 241,750    
Measured at fair value on a recurring basis: | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   0    
Equity securities with readily determinable fair value 55,704 207,346    
Mortgage loans held-for-sale 0 0    
Loans held-for-investment 0 0    
MSRs 0 0    
Nonqualified deferred compensation assets 0 0    
Derivative assets 0 0    
Total financial assets 62,739 245,253    
Derivative liabilities 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]        
Trading account securities   4,072    
Equity securities with readily determinable fair value 8,066 8,066    
Mortgage loans held-for-sale 286,931 270,862    
Loans held-for-investment 95,390 123,899    
MSRs 0 0    
Nonqualified deferred compensation assets 18,112 16,653    
Derivative assets 176,251 198,077    
Total financial assets 6,714,375 4,603,597    
Derivative liabilities 123,774 241,750    
Measured at fair value on a recurring basis: | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Trading account securities   0    
Equity securities with readily determinable fair value 0 0    
Mortgage loans held-for-sale 53,814 60,399    
Loans held-for-investment 56,200 34,896    
MSRs 195,023 203,788    
Nonqualified deferred compensation assets 0 0    
Derivative assets 3,416 1,950    
Total financial assets 408,056 422,640    
Derivative liabilities 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 7,035 37,907    
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 7,035 37,907    
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    
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    
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 47,471 44,945    
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    
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 47,471 44,945    
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    
Measured at fair value on a recurring basis: | Municipal securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 162,166 184,593    
Measured at fair value on a recurring basis: | Municipal securities | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 0 0    
Measured at fair value on a recurring basis: | Municipal securities | Level 2        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 62,563 62,986    
Measured at fair value on a recurring basis: | Municipal securities | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Available-for-sale securities 99,603 121,607    
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 77,295 81,162    
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    
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 77,295 81,162    
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    
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 5,942,296 3,792,875    
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    
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 5,942,296 3,792,875    
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