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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized cost | $ 80,321 | $ 84,021
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 71,688 | 76,485
Available-for-Sale Amortized Cost |  |
Amortized Cost | 3,382,604 | 3,827,418
Available-for-Sale Market Value |  |
Investment securities | 3,021,126 | 3,409,648
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 | 4,729 |
Available-for-Sale Market Value |  |
Investment securities | 4,721 |
After One Year Through Five Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 4,595 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 4,690 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 161,803 |
Available-for-Sale Market Value |  |
Investment securities | 148,088 |
After Five Years Through Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 33,130 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 29,781 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 225,993 |
Available-for-Sale Market Value |  |
Investment securities | 195,230 |
After Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 1,700 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 1,488 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 623,600 |
Available-for-Sale Market Value |  |
Investment securities | 525,913 |
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 | 744,546 | 747,478
Available-for-Sale Market Value |  |
Investment securities | 661,048 | 650,063
Mortgage-backed securities-commercial |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 32,926 | 35,363
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 28,298 | 31,249
Available-for-Sale Amortized Cost |  |
Amortized Cost | 543,134 | 676,934
Available-for-Sale Market Value |  |
Investment securities | 507,230 | 629,562
Collateralized mortgage obligations |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 7,970 | 9,280
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 7,431 | 8,453
Available-for-Sale Amortized Cost |  |
Amortized Cost | 478,744 | 538,970
Available-for-Sale Market Value |  |
Investment securities | 418,648 | 477,712
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 | 600,055 | 772,261
Available-for-Sale Market Value |  |
Investment securities | $ 560,248 | $ 711,325

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