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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 434,369 | $ 654,008
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 422,638 | 653,101
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 2,662,329 | 1,348,227
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,626,726 | 1,349,408
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 | 3,932 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,922 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 275 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 277 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 72,831 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 72,633 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 18,337 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 18,274 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 138,584 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 139,591 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 225,749 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 222,799 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 146,942 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 145,192 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 26,603 | 162,093
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 24,988 | 162,600
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 581,657 | 290,793
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 567,946 | 289,043
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 150,223 | 255,027
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 143,845 | 253,399
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 362,874 | 150,356
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 357,346 | 149,103
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 13,182 | 143,545
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 12,455 | 142,297
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 864,824 | 306,095
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 850,328 | 305,392
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 | 490,685 | 377,655
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 489,768 | $ 378,977

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