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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 154,327 | $ 429,328
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 153,039 | 424,118
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 3,104,152 | 2,792,326
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 3,152,970 | 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 | 8,322 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 8,337 |
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 | 41,902 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 42,607 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,284 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 4,721 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 156,370 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 160,519 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 7,233 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 7,281 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 446,306 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 461,386 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 23,736 | 25,565
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 23,705 | 24,520
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 507,434 | 565,071
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 513,989 | 558,599
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 107,810 | 147,780
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 106,249 | 143,653
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 482,157 | 423,797
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 486,645 | 421,035
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 11,264 | 12,540
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 11,083 | 11,907
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 940,304 | 928,586
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 958,386 | 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 | 521,357 | 511,430
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 521,101 | $ 509,231

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