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INVESTMENT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
AFS |  |
Amortized cost | $ 1,488,112 | $ 1,509,736
Gross unrealized gains | 133 | 135
Gross unrealized losses | (134,047) | (131,097)
Fair value | 1,354,198 | 1,378,774
Residential mortgage-backed securities |  |
AFS |  |
Amortized cost | 203,781 | 207,445
Gross unrealized gains | 25 | 0
Gross unrealized losses | (12,188) | (10,183)
Fair value | 191,618 | 197,262
Commercial mortgage-backed securities |  |
AFS |  |
Amortized cost | 62,412 | 65,411
Gross unrealized gains | 0 | 0
Gross unrealized losses | (9,181) | (9,362)
Fair value | 53,231 | 56,049
Residential collateralized mortgage obligations |  |
AFS |  |
Amortized cost | 559,765 | 592,449
Gross unrealized gains | 0 | 12
Gross unrealized losses | (41,574) | (39,422)
Fair value | 518,191 | 553,039
Commercial collateralized mortgage obligations |  |
AFS |  |
Amortized cost | 73,078 | 77,909
Gross unrealized gains | 0 | 0
Gross unrealized losses | (6,724) | (7,390)
Fair value | 66,354 | 70,519
Municipal bonds |  |
AFS |  |
Amortized cost | 459,416 | 469,346
Gross unrealized gains | 108 | 41
Gross unrealized losses | (53,979) | (57,839)
Fair value | 405,545 | 411,548
HTM |  |
Amortized cost | 2,406 | 2,441
Gross unrealized gains | 0 | 0
Gross unrealized losses | (69) | (56)
Fair value | 2,337 | 2,385
Corporate debt securities |  |
AFS |  |
Amortized cost | 45,717 | 46,672
Gross unrealized gains | 0 | 74
Gross unrealized losses | (6,694) | (3,801)
Fair value | 39,023 | 42,945
U.S. Treasury securities |  |
AFS |  |
Amortized cost | 22,833 | 23,005
Gross unrealized gains | 0 | 0
Gross unrealized losses | (2,965) | (3,071)
Fair value | 19,868 | 19,934
Agency debentures |  |
AFS |  |
Amortized cost | 61,110 | 27,499
Gross unrealized gains | 0 | 8
Gross unrealized losses | (742) | (29)
Fair value | $ 60,368 | $ 27,478

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