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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized cost | $ 76,960 | $ 80,321
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 68,989 | 71,688
Available-for-Sale Amortized Cost |  |
Amortized Cost | 3,512,652 | 3,382,604
Available-for-Sale Market Value |  |
Investment securities | 3,183,776 | 3,021,126
One Year or Less |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 0 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 0 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 540 |
Available-for-Sale Market Value |  |
Investment securities | 544 |
After One Year Through Five Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 5,666 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 5,675 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 115,611 |
Available-for-Sale Market Value |  |
Investment securities | 106,955 |
After Five Years Through Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 32,289 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 29,826 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 246,895 |
Available-for-Sale Market Value |  |
Investment securities | 210,864 |
After Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 1,554 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 1,279 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 488,838 |
Available-for-Sale Market Value |  |
Investment securities | 406,231 |
Mortgage-backed securities-residential |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 0 | 0
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Amortized Cost | 1,102,242 | 744,546
Available-for-Sale Market Value |  |
Investment securities | 998,542 | 661,048
Mortgage-backed securities-commercial |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 30,444 | 32,926
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 25,990 | 28,298
Available-for-Sale Amortized Cost |  |
Amortized Cost | 382,727 | 543,134
Available-for-Sale Market Value |  |
Investment securities | 357,372 | 507,230
Collateralized mortgage obligations |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 7,007 | 7,970
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 6,219 | 7,431
Available-for-Sale Amortized Cost |  |
Amortized Cost | 620,315 | 478,744
Available-for-Sale Market Value |  |
Investment securities | 569,165 | 418,648
Asset-backed Securities |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 0 | 0
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Amortized Cost | 555,484 | 600,055
Available-for-Sale Market Value |  |
Investment securities | $ 534,103 | $ 560,248

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