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Fair Values of Assets and Liabilities (Summary of Balances of Assets and Liabilities Measured at Fair Value On A Recurring Basis) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities $ 3,492,481   $ 3,243,017 $ 2,970,121    
Equity securities with readily determinable fair value 116,275   110,365 93,295    
Loans held-for-investment 200,447     122,757    
MSRs 200,692 $ 224,470 230,225 212,664 $ 199,146 $ 147,571
U.S. Treasury            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 0   14,948 0    
U.S. government agencies            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 74,275   74,222 48,087    
Municipal securities            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Available-for-sale securities 167,411   168,655 166,705    
Measured at fair value on a recurring basis:            
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]            
Trading account securities 3,027   1,127 1,010    
Equity securities with readily determinable fair value 116,275   110,365 93,295    
Mortgage loans held-for-sale 338,728   299,935 513,232    
Loans held-for-investment 193,953   179,932 122,757    
MSRs 200,692   230,225 212,664    
Nonqualified deferred compensation assets 14,796   13,899 13,936    
Derivative assets 294,748   296,848 183,925    
Total 4,654,700   4,375,348 4,110,940    
Derivative liabilities 391,172   338,078 167,857    
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   0 0    
Equity securities with readily determinable fair value 108,209   102,299 85,229    
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 108,209   117,247 85,229    
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]            
Trading account securities 3,027   1,127 1,010    
Equity securities with readily determinable fair value 8,066   8,066 8,066    
Mortgage loans held-for-sale 309,322   251,280 424,269    
Loans held-for-investment 132,830   95,767 37,959    
MSRs 0   0 0    
Nonqualified deferred compensation assets 14,796   13,899 13,936    
Derivative assets 291,261   295,137 177,276    
Total 4,137,628   3,775,808 3,519,152    
Derivative liabilities 391,172   338,078 167,857    
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   0 0    
Equity securities with readily determinable fair value 0   0 0    
Mortgage loans held-for-sale 29,406   48,655 88,963    
Loans held-for-investment 61,123   84,165 84,798    
MSRs 200,692   230,225 212,664    
Nonqualified deferred compensation assets 0   0 0    
Derivative assets 3,487   1,711 6,649    
Total 408,863   482,293 506,559    
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 0   14,948 0    
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 0   14,948 0    
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 74,275   74,222 48,087    
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 74,275   74,222 48,087    
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    
Mortgage loans held-for-sale 29,406          
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 167,411   168,655 166,705    
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 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 53,256   51,118 53,220    
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 114,155   117,537 113,485    
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 72,060   85,705 89,813    
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 72,060   85,705 89,813    
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 3,178,735   2,899,487 2,665,516    
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 3,178,735   2,899,487 2,665,516    
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