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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 127,347 | $ 142,862
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 132,956 | 142,821
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 2,815,199 | 2,798,298
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,897,413 |
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 | 4,126 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 4,162 |
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 | 55,428 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 56,534 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,840 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 5,720 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 153,966 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 156,133 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 5,819 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 6,076 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 587,481 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 617,848 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 18,560 | 20,818
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 18,924 | 20,766
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 413,981 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 431,523 |
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 90,005 | 101,267
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 94,005 | 100,613
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 489,962 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 494,557 |
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 8,123 | 9,763
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 8,231 | 9,655
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 729,540 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 760,598 |
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 | 380,715 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 376,058 |

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