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INVESTMENTS - Summary of Investment Securities by Estimated Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held-to-Maturity Amortized Cost |  |
Amortized Cost | $ 136,744 | $ 142,862
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 140,065 | 142,821
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 2,857,355 | 2,798,298
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 2,908,688 |
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 | 5,138 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 5,157 |
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 | 55,648 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 56,434 |
After Five Years Through Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 4,797 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 5,476 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 148,614 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 147,686 |
After Ten Years [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 5,999 |
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 6,150 |
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 594,125 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 620,883 |
Residential Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 19,832 | 20,818
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 20,878 | 20,766
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 419,423 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 438,419 |
Commercial Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 97,073 | 101,267
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 98,369 | 100,613
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 506,343 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 504,295 |
Collateralized Mortgage Backed Securities [Member] |  |
Held-to-Maturity Amortized Cost |  |
Amortized Cost | 9,043 | 9,763
Held-to-Maturity Market Value |  |
Debt Securities, Held-to-maturity, Fair Value | 9,192 | 9,655
Available-for-Sale Amortized Cost |  |
Available-for-sale Securities, Amortized Cost Basis | 745,649 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | 772,015 |
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 | 382,415 |
Available-for-Sale Market Value |  |
Investment securities available-for-sale | $ 363,799 |

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