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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized cost | $ 142,862 | $ 429,328
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 142,821 | 424,118
Available-for-Sale Amortized Cost |  |
Amortized Cost | 2,798,298 | 2,792,326
Available-for-Sale Market Value |  |
Investment securities | 2,852,084 | 2,779,255
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 | 7,382 |
Available-for-Sale Market Value |  |
Investment securities | 7,408 |
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 | 52,075 |
Available-for-Sale Market Value |  |
Investment securities | 53,189 |
After Five Years Through Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 4,756 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 5,417 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 144,626 |
Available-for-Sale Market Value |  |
Investment securities | 149,961 |
After Ten Years |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 6,258 |
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 6,370 |
Available-for-Sale Amortized Cost |  |
Amortized Cost | 528,939 |
Available-for-Sale Market Value |  |
Investment securities | 547,578 |
Mortgage-backed securities-residential |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 20,818 | 25,565
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 20,766 | 24,520
Available-for-Sale Amortized Cost |  |
Amortized Cost | 421,945 | 565,071
Available-for-Sale Market Value |  |
Investment securities | 431,555 | 558,599
Mortgage-backed securities-commercial |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 101,267 | 147,780
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 100,613 | 143,653
Available-for-Sale Amortized Cost |  |
Amortized Cost | 474,174 | 423,797
Available-for-Sale Market Value |  |
Investment securities | 476,518 | 421,035
Collateralized mortgage obligations |  |
Held-to-Maturity Amortized Cost |  |
Amortized cost | 9,763 | 12,540
Held-to-Maturity Market Value |  |
Held-to-Maturity Market Value | 9,655 | 11,907
Available-for-Sale Amortized Cost |  |
Amortized Cost | 769,076 | 928,586
Available-for-Sale Market Value |  |
Investment securities | 785,444 | 926,747
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 | 400,081 | 511,430
Available-for-Sale Market Value |  |
Investment securities | $ 400,431 | $ 509,231

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