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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | $ 1,287,846 | $ 1,220,444
Gross Unrealized Gains | 21,303 | 20,959
Gross Unrealized Losses | (5,781) | (9,972)
Securities available-for-sale, at fair value | 1,303,368 | 1,231,431
SBA loan pool securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 15,489 | 17,436
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (68) | (82)
Securities available-for-sale, at fair value | 15,421 | 17,354
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 190,708 | 99,591
Gross Unrealized Gains | 3,556 | 6,793
Gross Unrealized Losses | (978) | 0
Securities available-for-sale, at fair value | 193,286 | 106,384
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 254,775 | 209,426
Gross Unrealized Gains | 2,062 | 2,571
Gross Unrealized Losses | (1,532) | (166)
Securities available-for-sale, at fair value | 255,305 | 211,831
Municipal securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 117,955 | 64,355
Gross Unrealized Gains | 3,167 | 4,272
Gross Unrealized Losses | (705) | (4)
Securities available-for-sale, at fair value | 120,417 | 68,623
Non-agency residential mortgage-backed securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 149 | 156
Gross Unrealized Gains | 5 | 4
Gross Unrealized Losses | 0 | 0
Securities available-for-sale, at fair value | 154 | 160
Collateralized loan obligations |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 551,775 | 687,505
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,498) | (9,720)
Securities available-for-sale, at fair value | 549,277 | 677,785
Corporate debt securities |  |
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract] |  |
Amortized Cost | 156,995 | 141,975
Gross Unrealized Gains | 12,513 | 7,319
Gross Unrealized Losses | 0 | 0
Securities available-for-sale, at fair value | $ 169,508 | $ 149,294

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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