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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 112,456 | $ 131,687
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 115,171 | 136,698
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 3,885,363 | 3,330,029
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,955,839 |
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 |  |
Available-for-sale Securities, Amortized Cost Basis | 26,647 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 26,908 |
After One Year Through Five Years [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 |  |
Available-for-sale Securities, Amortized Cost Basis | 50,859 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 52,674 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 37,186 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 37,931 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 298,659 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 309,239 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 3,452 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 3,517 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 796,786 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 826,902 |
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 |  |
Available-for-sale Securities, Amortized Cost Basis | 686,994 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 691,363 |
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 56,833 | 71,737
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 58,661 | 75,222
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 685,920 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 693,737 |
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 14,985 | 5,799
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 15,062 | 5,878
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 740,172 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 752,267 |
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 |  |
Available-for-sale Securities, Amortized Cost Basis | 599,326 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 602,749 |

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