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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 103,886 | $ 131,687
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 105,679 | 136,698
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 4,065,301 | 3,330,029
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 4,114,094 | 3,424,580
One Year or Less [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 26,751 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 26,938 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 635 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 696 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 53,516 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 55,332 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 36,603 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 37,162 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 333,192 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 343,266 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 3,162 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 3,206 |
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 841,610 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 859,531 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 13,990
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 14,187
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 711,442 | 704,482
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 713,885 | 720,183
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 50,456 | 71,737
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 51,793 | 75,222
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 702,387 | 584,125
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 707,913 | 590,936
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 13,030 | 5,799
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 12,822 | 5,878
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 730,190 | 634,418
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | 738,323 | 655,121
Asset-backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 0
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Debt Securities, Available-for-sale, Amortized Cost | 666,213 | 478,539
Available-for-Sale Market Value |  |
Investment securities available-for-sale, at fair value (amortized cost $4,065,301 at September 30, 2021 and $3,330,029 at December 31, 2020) | $ 668,906 | $ 481,871

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