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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 669,816 | $ 763,254
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 672,236 | 763,575
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 1,281,320 | 1,045,337
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 1,286,770 | 1,039,870
One Year or Less [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 170 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 170 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 2,408 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,408 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,466 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 4,469 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 26,795 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 27,154 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 2,690 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 2,849 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 78,265 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 79,868 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 79,626 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 80,416 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 114,290 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 116,042 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 171,468 | 205,522
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 172,315 | 206,096
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 272,254 | 184,960
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 272,116 | 183,395
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 257,590 | 278,728
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 258,192 | 280,165
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 142,152 | 154,239
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 142,198 | 153,601
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 153,806 | 195,408
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 153,825 | 195,057
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 304,679 | 232,701
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 305,103 | 231,014
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 | 340,477 | 322,708
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 341,881 | $ 321,212

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