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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities held-to-maturity: |  |
Amortized cost | $ 328,287 | $ 328,641
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (78,002) | (66,181)
Allowance for Credit Losses | 0 | 0
Securities held-to-maturity | 250,285 | 262,460
Securities available-for-sale: |  |
Amortized cost | 968,009 | 909,563
Gross Unrealized Gains | 5 | 32
Gross Unrealized Losses | (51,924) | (41,298)
Allowance for Credit Losses | (1,036) | 0
Available-for-sale securities | 915,054 | 868,297
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities |  |
Securities held-to-maturity: |  |
Amortized cost | 152,748 | 153,033
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (35,680) | (29,807)
Allowance for Credit Losses | 0 | 0
Securities held-to-maturity | 117,068 | 123,226
Securities available-for-sale: |  |
Amortized cost | 79,786 | 40,431
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,942) | (225)
Allowance for Credit Losses | 0 | 0
Available-for-sale securities | 76,844 | 40,206
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations |  |
Securities held-to-maturity: |  |
Amortized cost | 61,337 | 61,404
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15,688) | (11,946)
Allowance for Credit Losses | 0 | 0
Securities held-to-maturity | 45,649 | 49,458
Securities available-for-sale: |  |
Amortized cost | 93,696 | 99,075
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,864) | (5,884)
Allowance for Credit Losses | 0 | 0
Available-for-sale securities | 85,832 | 93,191
Municipal securities |  |
Securities held-to-maturity: |  |
Amortized cost | 114,202 | 114,204
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (26,634) | (24,428)
Allowance for Credit Losses | 0 | 0
Securities held-to-maturity | 87,568 | 89,776
SBA loan pool securities |  |
Securities available-for-sale: |  |
Amortized cost | 8,721 | 11,241
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | (27) | (54)
Allowance for Credit Losses | 0 | 0
Available-for-sale securities | 8,699 | 11,187
Non-agency residential mortgage-backed securities |  |
Securities available-for-sale: |  |
Amortized cost | 120,062 | 90,832
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (15,102) | (10,340)
Allowance for Credit Losses | 0 | 0
Available-for-sale securities | 104,960 | 80,492
Collateralized loan obligations |  |
Securities available-for-sale: |  |
Amortized cost | 489,940 | 492,203
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6,136) | (15,600)
Allowance for Credit Losses | 0 | 0
Available-for-sale securities | 483,804 | 476,603
Corporate debt securities |  |
Securities available-for-sale: |  |
Amortized cost | 175,804 | 175,781
Gross Unrealized Gains | 0 | 32
Gross Unrealized Losses | (19,853) | (9,195)
Allowance for Credit Losses | (1,036) | 0
Available-for-sale securities | $ 154,915 | $ 166,618

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