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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized cost | $ 84,021 | $ 98,420
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 76,485 | 99,898
Available-for-Sale Amortized Cost |  |
Amortized Cost | 3,827,418 | 4,180,589
Available-for-Sale Market Value |  |
Investment securities | 3,409,648 | 4,207,846
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 | 8,230 |
Available-for-Sale Market Value |  |
Investment securities | 8,125 |
After One Year Through Five Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 2,584 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 2,662 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 93,629 |
Available-for-Sale Market Value |  |
Investment securities | 89,551 |
After Five Years Through Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 34,920 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 32,410 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 292,581 |
Available-for-Sale Market Value |  |
Investment securities | 255,143 |
After Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 1,874 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 1,711 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 697,335 |
Available-for-Sale Market Value |  |
Investment securities | 588,167 |
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 | 747,478 | 728,050
Available-for-Sale Market Value |  |
Investment securities | 650,063 | 724,137
Mortgage-backed securities-commercial |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 35,363 | 46,362
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 31,249 | 47,013
Available-for-Sale Amortized Cost |  |
Amortized Cost | 676,934 | 729,948
Available-for-Sale Market Value |  |
Investment securities | 629,562 | 731,890
Collateralized mortgage obligations |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 9,280 | 11,882
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 8,453 | 12,103
Available-for-Sale Amortized Cost |  |
Amortized Cost | 538,970 | 696,258
Available-for-Sale Market Value |  |
Investment securities | 477,712 | 697,740
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 | 772,261 | 720,638
Available-for-Sale Market Value |  |
Investment securities | $ 711,325 | $ 719,581

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