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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 158,305 | $ 429,328
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 153,075 | 424,118
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 3,096,085 | 2,792,326
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,113,811 | 2,779,255
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 | 18,503 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 18,522 |
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 | 52,079 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 52,547 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,247 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 4,579 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 162,531 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 165,532 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 7,359 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 7,239 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 419,127 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 427,878 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 24,937 | 25,565
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 24,338 | 24,520
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 557,730 | 565,071
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 558,847 | 558,599
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 109,826 | 147,780
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 105,412 | 143,653
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 464,611 | 423,797
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 463,444 | 421,035
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 11,936 | 12,540
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 11,507 | 11,907
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 919,486 | 928,586
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 925,633 | 926,747
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 | 502,018 | 511,430
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 501,408 | $ 509,231

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