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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities held-to-maturity: |  |
Amortized Cost | $ 328,757 | $ 0
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (65,405) |
Fair Value | 263,352 |
Securities available-for-sale: |  |
Amortized Cost | 898,375 | 1,304,723
Gross Unrealized Gains | 16 | 18,324
Gross Unrealized Losses | (50,826) | (7,344)
Securities available-for-sale, at fair value | 847,565 | 1,315,703
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities held-to-maturity: |  |
Amortized Cost | 153,127 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (29,178) |
Fair Value | 123,949 |
Securities available-for-sale: |  |
Amortized Cost | 12,012 | 190,382
Gross Unrealized Gains | 0 | 2,898
Gross Unrealized Losses | (1,316) | (1,311)
Securities available-for-sale, at fair value | 10,696 | 191,969
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities held-to-maturity: |  |
Amortized Cost | 61,426 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (11,950) |
Fair Value | 49,476 |
Securities available-for-sale: |  |
Amortized Cost | 151,582 | 242,458
Gross Unrealized Gains | 0 | 1,171
Gross Unrealized Losses | (10,425) | (2,088)
Securities available-for-sale, at fair value | 141,157 | 241,541
Municipal securities |  |
Securities held-to-maturity: |  |
Amortized Cost | 114,204 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (24,277) |
Fair Value | 89,927 |
Securities available-for-sale: |  |
Amortized Cost |  | 117,913
Gross Unrealized Gains |  | 2,641
Gross Unrealized Losses |  | (1,539)
Securities available-for-sale, at fair value |  | 119,015
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized Cost | 12,156 | 14,679
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (54) | (88)
Securities available-for-sale, at fair value | 12,106 | 14,591
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized Cost | 52,076 | 56,014
Gross Unrealized Gains | 0 | 11
Gross Unrealized Losses | (10,562) | 0
Securities available-for-sale, at fair value | 41,514 | 56,025
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized Cost | 492,775 | 521,275
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (20,099) | (2,311)
Securities available-for-sale, at fair value | 472,676 | 518,964
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized Cost | 177,774 | 162,002
Gross Unrealized Gains | 12 | 11,603
Gross Unrealized Losses | (8,370) | (7)
Securities available-for-sale, at fair value | $ 169,416 | $ 173,598

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