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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 633,722 | $ 654,008
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 623,967 | 653,101
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 1,370,844 | 1,348,227
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 1,359,381 | 1,349,408
One Year or Less [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 165 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 165 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 2,296 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,292 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,277 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 4,279 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 37,023 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 36,960 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 2,499 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 2,632 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 82,431 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 83,521 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 85,177 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 84,711 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 109,128 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 109,448 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 155,208 | 162,093
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 153,616 | 162,600
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 288,757 | 290,793
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 282,443 | 289,043
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 251,253 | 255,027
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 246,133 | 253,399
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 153,770 | 150,356
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 150,942 | 149,103
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 135,143 | 143,545
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 132,431 | 142,297
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 305,496 | 306,095
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 301,263 | 305,392
Asset-backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 0 | 0
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 0 | 0
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 391,943 | 377,655
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 392,512 | $ 378,977

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