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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 696,269 | $ 763,254
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 698,722 | 763,575
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 1,295,377 | 1,045,337
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 1,298,578 | 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 | 2,236 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,238 |
After One Year Through Five Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 3,657 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 3,660 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 25,504 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 25,743 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 2,691 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 2,790 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 73,547 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 75,012 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 80,834 |
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 81,228 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 122,624 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 123,835 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 181,553 | 205,522
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 182,211 | 206,096
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 262,052 | 184,960
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 261,173 | 183,395
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 261,739 | 278,728
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 262,983 | 280,165
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 157,138 | 154,239
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 157,408 | 153,601
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 165,625 | 195,408
Held-to-Maturity Market Value |  |
Held-to-maturity Securities, Fair Value | 165,680 | 195,057
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 324,712 | 232,701
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 324,392 | 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 | 327,564 | 322,708
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 328,777 | $ 321,212

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