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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized cost | $ 131,687 | $ 142,862
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 136,698 | 142,821
Available-for-Sale Amortized Cost |  |
Amortized Cost | 3,330,029 | 2,798,298
Available-for-Sale Market Value |  |
Investment securities | 3,424,580 | 2,852,084
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 | 5,745 |
Available-for-Sale Market Value |  |
Investment securities | 5,802 |
After One Year Through Five Years |  |
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 | 62,930 |
Available-for-Sale Market Value |  |
Investment securities | 64,886 |
After Five Years Through Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 36,084 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 37,205 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 161,307 |
Available-for-Sale Market Value |  |
Investment securities | 169,692 |
After Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 4,077 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 4,206 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 698,483 |
Available-for-Sale Market Value |  |
Investment securities | 736,089 |
Mortgage-backed securities-residential |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 13,990 | 20,818
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 14,187 | 20,766
Available-for-Sale Amortized Cost |  |
Amortized Cost | 704,482 |
Available-for-Sale Market Value |  |
Investment securities | 720,183 | 431,555
Mortgage-backed securities-commercial |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 71,737 | 101,267
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 75,222 | 100,613
Available-for-Sale Amortized Cost |  |
Amortized Cost | 584,125 |
Available-for-Sale Market Value |  |
Investment securities | 590,936 | 476,518
Collateralized mortgage obligations |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 5,799 | 9,763
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 5,878 | 9,655
Available-for-Sale Amortized Cost |  |
Amortized Cost | 634,418 |
Available-for-Sale Market Value |  |
Investment securities | 655,121 | 785,444
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 | 478,539 |
Available-for-Sale Market Value |  |
Investment securities | $ 481,871 | $ 400,431

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