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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 121,945 | $ 131,687
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 124,294 | 136,698
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 3,698,779 | 3,330,029
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,753,763 |
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 | 14,781 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 14,963 |
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 | 56,598 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 58,309 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 37,135 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 37,662 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 184,348 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 192,197 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 3,749 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 3,839 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 803,858 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 826,174 |
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 | 784,407 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 785,640 |
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 63,481 | 71,737
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 65,515 | 75,222
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 591,629 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 595,045 |
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 17,580 | 5,799
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 17,278 | 5,878
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 661,322 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 676,714 |
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 | 601,836 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 604,721 |

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