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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, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale, at fair value | [1] | $ 10,009,500 | $ 9,006,600
Total derivative instruments, after netting |  | 81,082 | 19,049
Originated loans held for sale |  | $ 2,142 | 297
Derivative Liability Statement Of Financial Position Extensible Enumeration Not Disclosed Flag |  | true |
Derivative Liability |  | $ 146,598 | 279,600
Fair Value, Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Investment securities available-for-sale, at fair value |  | 10,009,500 | 9,006,600
Alternative investments measured at NAV |  | 57,549 | 43,360
Total financial assets |  | 10,314,807 | 9,365,837
Derivative Liability |  | 223,714 | 311,561
Contingent consideration |  | 8,420 | 11,750
Total financial liabilities |  | 232,134 | 323,311
Fair Value, Recurring | Derivative instruments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total derivative instruments, after netting |  | 230,201 | 302,142
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 measured at NAV |  | 0 | 0
Total financial assets |  | 15,567 | 14,701
Derivative Liability |  | 417 | 43
Contingent consideration |  | 0 | 0
Total financial liabilities |  | 417 | 43
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 |  | 152 | 1,263
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 |  | 10,009,500 | 9,006,600
Alternative investments measured at NAV |  | 0 | 0
Total financial assets |  | 10,241,691 | 9,307,776
Derivative Liability |  | 223,297 | 311,518
Contingent consideration |  | 0 | 0
Total financial liabilities |  | 223,297 | 311,518
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 |  | 230,049 | 300,879
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 measured at NAV |  | 0 | 0
Total financial assets |  | 0 | 0
Derivative Liability |  | 0 | 0
Contingent consideration |  | 8,420 | 11,750
Total financial liabilities |  | 8,420 | 11,750
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 |  | 2,142 | 297
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 |  | 2,142 | 297
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 |  | 15,415 | 13,438
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 |  | 15,415 | 13,438
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 |  | 197,650 | 186,426
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 |  | 197,650 | 186,426
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 |  | 197,650 | 186,426
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 |  | 109,619 | 110,876
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 |  | 109,619 | 110,876
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 |  | 109,619 | 110,876
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 |  | 24,856 | 29,043
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 |  | 24,856 | 29,043
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 |  | 24,856 | 29,043
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 |  | 5,057,273 | 4,519,785
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 |  | 5,057,273 | 4,519,785
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 |  | 5,057,273 | 4,519,785
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 |  | 3,526,010 | 3,034,392
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 |  | 3,526,010 | 3,034,392
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 |  | 3,526,010 | 3,034,392
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 |  | 718,412 | 625,388
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 |  | 718,412 | 625,388
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 |  | 718,412 | 625,388
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 |  | 328,145 | 452,266
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 |  | 328,145 | 452,266
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 |  | 328,145 | 452,266
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 |  | 38,052 | 39,219
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 |  | 38,052 | 39,219
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 |  | 38,052 | 39,219
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 |  | 9,483 | 9,205
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 |  | 9,483 | 9,205
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 |  | 9,483 | 9,205
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 $10,466,978 at December 31, 2025, and $9,720,415 at December 31, 2024.

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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