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INVESTMENT SECURITIES - Summary of Securities Available-for-sale (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities available-for-sale: |  |
Amortized Cost | $ 1,220,444 | $ 929,449
Gross Unrealized Gains | 20,959 | 151
Gross Unrealized Losses | (9,972) | (17,020)
Securities available-for-sale, carried at fair value | 1,231,431 | 912,580
SBA loan pools securities |  |
Securities available-for-sale: |  |
Amortized Cost | 17,436 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (82) |
Securities available-for-sale, carried at fair value | 17,354 |
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 99,591 | 37,613
Gross Unrealized Gains | 6,793 | 0
Gross Unrealized Losses | 0 | (1,157)
Securities available-for-sale, carried at fair value | 106,384 | 36,456
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 209,426 | 91,543
Gross Unrealized Gains | 2,571 | 16
Gross Unrealized Losses | (166) | (260)
Securities available-for-sale, carried at fair value | 211,831 | 91,299
Municipal securities |  |
Securities available-for-sale: |  |
Amortized Cost | 64,355 | 52,997
Gross Unrealized Gains | 4,272 | 51
Gross Unrealized Losses | (4) | (359)
Securities available-for-sale, carried at fair value | 68,623 | 52,689
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 156 | 191
Gross Unrealized Gains | 4 | 5
Gross Unrealized Losses | 0 | 0
Securities available-for-sale, carried at fair value | 160 | 196
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 687,505 | 733,605
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (9,720) | (15,244)
Securities available-for-sale, carried at fair value | 677,785 | 718,361
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost | 141,975 | 13,500
Gross Unrealized Gains | 7,319 | 79
Gross Unrealized Losses | 0 | 0
Securities available-for-sale, carried at fair value | $ 149,294 | $ 13,579

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