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Fair Value Measurements - Summary of Fair Values of Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value [1] $ 9,006,600 $ 8,959,729
Total derivative instruments, after netting 19,049 42,497
Originated loans held for sale $ 297 2,610
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag true  
Derivative Liability $ 279,600 279,861
Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 9,006,600 8,959,729
Alternative investments   959
Alternative investments measured at NAV 43,360 35,888
Total financial assets 9,365,837 9,341,722
Derivative Liability 311,561 335,810
Contingent consideration 11,750 15,800
Total financial liabilities 323,311 351,610
Fair Value, Recurring | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative instruments, after netting 302,142 330,636
Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Alternative investments   959
Alternative investments measured at NAV 0 0
Total financial assets 14,701 13,076
Derivative Liability 43 970
Contingent consideration 0 0
Total financial liabilities 43 970
Fair Value, Recurring | Level 1 | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative instruments, after netting 1,263 217
Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 9,006,600 8,959,729
Alternative investments   0
Alternative investments measured at NAV 0 0
Total financial assets 9,307,776 9,292,758
Derivative Liability 311,518 334,840
Contingent consideration 0 0
Total financial liabilities 311,518 334,840
Fair Value, Recurring | Level 2 | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative instruments, after netting 300,879 330,419
Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Alternative investments   0
Alternative investments measured at NAV 0 0
Total financial assets 0 0
Derivative Liability 0 0
Contingent consideration 11,750 15,800
Total financial liabilities 11,750 15,800
Fair Value, Recurring | Level 3 | Derivative instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total derivative instruments, after netting 0 0
Originated loans held for sale | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Originated loans held for sale 297 2,610
Originated loans held for sale | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Originated loans held for sale 0 0
Originated loans held for sale | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Originated loans held for sale 297 2,610
Originated loans held for sale | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Originated loans held for sale 0 0
Investments held in Rabbi Trusts | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held in Rabbi Trust 13,438 11,900
Investments held in Rabbi Trusts | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held in Rabbi Trust 13,438 11,900
Investments held in Rabbi Trusts | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held in Rabbi Trust 0 0
Investments held in Rabbi Trusts | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments held in Rabbi Trust 0 0
Government agency debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 186,426 264,633
Government agency debentures | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 186,426 264,633
Government agency debentures | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Government agency debentures | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 186,426 264,633
Government agency debentures | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Municipal bonds and notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 110,876 1,573,233
Municipal bonds and notes | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 110,876 1,573,233
Municipal bonds and notes | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Municipal bonds and notes | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 110,876 1,573,233
Municipal bonds and notes | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Agency CMO    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 29,043 48,941
Agency CMO | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 29,043 48,941
Agency CMO | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Agency CMO | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 29,043 48,941
Agency CMO | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Agency MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 4,519,785 3,347,098
Agency MBS | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 4,519,785 3,347,098
Agency MBS | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Agency MBS | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 4,519,785 3,347,098
Agency MBS | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Agency CMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 3,034,392 2,288,071
Agency CMBS | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 3,034,392 2,288,071
Agency CMBS | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Agency CMBS | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 3,034,392 2,288,071
Agency CMBS | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
CMBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 625,388 763,749
CMBS | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 625,388 763,749
CMBS | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
CMBS | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 625,388 763,749
CMBS | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Corporate debt    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 452,266 622,155
Corporate debt | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 452,266 622,155
Corporate debt | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Corporate debt | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 452,266 622,155
Corporate debt | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Private label MBS    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 39,219 42,808
Private label MBS | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 39,219 42,808
Private label MBS | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Private label MBS | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 39,219 42,808
Private label MBS | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Other    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 9,205 9,041
Other | Fair Value, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 9,205 9,041
Other | Fair Value, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 0 0
Other | Fair Value, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value 9,205 9,041
Other | Fair Value, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities available-for-sale, at fair value $ 0 $ 0
[1] Investment securities available-for-sale had an amortized cost basis of $9,720,415 at December 31, 2024, and $9,668,422 at December 31, 2023.