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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 148,778 | $ 429,328
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 149,724 | 424,118
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 2,789,151 | 2,792,326
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,850,502 | 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 | 8,694 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 8,713 |
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 | 48,276 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 49,127 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,321 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 4,830 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 147,357 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 152,333 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 6,959 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 7,094 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 463,307 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 483,955 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 22,367 | 25,565
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 22,510 | 24,520
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 416,446 | 565,071
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 426,022 | 558,599
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 104,586 | 147,780
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 104,863 | 143,653
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 440,457 | 423,797
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 445,334 | 421,035
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 10,545 | 12,540
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 10,427 | 11,907
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 799,072 | 928,586
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 818,931 | 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 | 465,542 | 511,430
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 466,087 | $ 509,231

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