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Securities - Schedule of Amortized Cost and Fair Value of Available-for-Sale and Held-to-Maturity Securities by Contractual Maturity (Detail) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
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Amortized Cost And Fair Value Debt Securities [Abstract] |  |
Total available-for-sale debt securities, Amortized Cost, Within one year | $ 223,288 |
Total available-for-sale debt securities, Amortized Cost, After 1 year through 5 years | 197,551 |
Total available-for-sale debt securities, Amortized Cost, After 5 years through 10 years | 244,932 |
Total available-for-sale debt securities, Amortized Cost, After 10 years | 2,741,322 |
Available-for-sale, Amortized Cost | 3,407,093 | $ 2,541,107
Total held-to-maturity debt securities, Amortized Cost, Within one year | 30,590 |
Total held-to-maturity debt securities, Amortized Cost, After 1 year through 5 years | 136,661 |
Total held-to-maturity debt securities, Amortized Cost, After 5 years through 10 years | 520,245 |
Total held-to-maturity debt securities, Amortized Cost, After 10 years | 455,880 |
Held-to-maturity, Amortized Cost | 1,143,376 | 1,152,906
Total debt securities, Amortized Cost | 4,550,469 | 3,694,013
Total available-for-sale debt securities, Fair Value, Within one year | 223,217 |
Total available-for-sale debt securities, Fair Value, After 1 year through 5 years | 192,936 |
Total available-for-sale debt securities, Fair Value, After 5 years through 10 years | 232,602 |
Total available-for-sale debt securities, Fair Value, After 10 years | 2,500,288 |
Total available-for-sale debt securities, Fair Value | 3,149,043 | 2,246,072
Total held-to-maturity debt securities, Fair Value, Within one year | 30,513 |
Total held-to-maturity debt securities, Fair Value, After 1 year through 5 years | 133,541 |
Total held-to-maturity debt securities, Fair Value, After 5 years through 10 years | 470,826 |
Total held-to-maturity debt securities, Fair Value, After 10 years | 367,916 |
Total held-to-maturity debt securities, Fair Value | 1,002,796 | 1,006,817
Total debt securities, Fair Value | $ 4,151,839 | $ 3,252,889

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