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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized cost | $ 98,420 | $ 131,687
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 99,898 | 136,698
Available-for-Sale Amortized Cost |  |
Amortized Cost | 4,180,589 | 3,330,029
Available-for-Sale Market Value |  |
Investment securities | 4,207,846 | 3,424,580
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 | 18,824 |
Available-for-Sale Market Value |  |
Investment securities | 18,910 |
After One Year Through Five Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 639 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 699 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 84,773 |
Available-for-Sale Market Value |  |
Investment securities | 86,693 |
After Five Years Through Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 36,651 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 37,166 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 355,693 |
Available-for-Sale Market Value |  |
Investment securities | 364,968 |
After Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 2,886 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 2,917 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 846,405 |
Available-for-Sale Market Value |  |
Investment securities | 863,927 |
Mortgage-backed securities-residential |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 0 | 13,990
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 0 | 14,187
Available-for-Sale Amortized Cost |  |
Amortized Cost | 728,050 | 704,482
Available-for-Sale Market Value |  |
Investment securities | 724,137 | 720,183
Mortgage-backed securities-commercial |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 46,362 | 71,737
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 47,013 | 75,222
Available-for-Sale Amortized Cost |  |
Amortized Cost | 729,948 | 584,125
Available-for-Sale Market Value |  |
Investment securities | 731,890 | 590,936
Collateralized mortgage obligations |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 11,882 | 5,799
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 12,103 | 5,878
Available-for-Sale Amortized Cost |  |
Amortized Cost | 696,258 | 634,418
Available-for-Sale Market Value |  |
Investment securities | 697,740 | 655,121
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 | 720,638 | 478,539
Available-for-Sale Market Value |  |
Investment securities | $ 719,581 | $ 481,871

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