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INVESTMENT SECURITIES - Continuous Unrealized Loss on Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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AFS |  |
AFS, Less than 12 months, Gross unrealized losses | $ (38,540) | $ (2,503)
AFS, Less than 12 months, Fair value | 779,641 | 181,901
AFS, Twelve months or more, Gross unrealized losses | (5,421) | (822)
AFS, Twelve months or more, Fair value | 43,297 | 15,712
AFS, Total, Gross unrealized losses | (43,961) | (3,325)
AFS, Total, Fair value | 822,938 | 197,613
Residential mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (1,064) | (38)
AFS, Less than 12 months, Fair value | 25,716 | 5,324
AFS, Twelve months or more, Gross unrealized losses | (444) | (300)
AFS, Twelve months or more, Fair value | 2,233 | 2,406
AFS, Total, Gross unrealized losses | (1,508) | (338)
AFS, Total, Fair value | 27,949 | 7,730
Commercial mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (3,958) | (235)
AFS, Less than 12 months, Fair value | 58,243 | 18,127
AFS, Twelve months or more, Gross unrealized losses | 0 | 0
AFS, Twelve months or more, Fair value | 0 | 0
AFS, Total, Gross unrealized losses | (3,958) | (235)
AFS, Total, Fair value | 58,243 | 18,127
Residential collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (7,475) | (1,007)
AFS, Less than 12 months, Fair value | 177,481 | 53,068
AFS, Twelve months or more, Gross unrealized losses | (2,465) | (314)
AFS, Twelve months or more, Fair value | 21,315 | 7,116
AFS, Total, Gross unrealized losses | (9,940) | (1,321)
AFS, Total, Fair value | 198,796 | 60,184
Commercial collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (2,802) | (135)
AFS, Less than 12 months, Fair value | 103,919 | 14,806
AFS, Twelve months or more, Gross unrealized losses | (622) | (198)
AFS, Twelve months or more, Fair value | 7,608 | 5,132
AFS, Total, Gross unrealized losses | (3,424) | (333)
AFS, Total, Fair value | 111,527 | 19,938
Municipal bonds |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (21,126) | (914)
AFS, Less than 12 months, Fair value | 375,801 | 64,237
AFS, Twelve months or more, Gross unrealized losses | (1,890) | (10)
AFS, Twelve months or more, Fair value | 12,141 | 1,058
AFS, Total, Gross unrealized losses | (23,016) | (924)
AFS, Total, Fair value | 387,942 | 65,295
HTM |  |
HFM, Less than 12 months, Gross unrealized losses | (17) |
HFM, Less than 12 months, Fair value | 2,474 |
HFM, 12 months or more, Gross unrealized losses | 0 |
HFM, 12 months or more, Fair value | 0 |
HFM, Total, Gross unrealized losses | (17) |
HTM, Total, Fair value | 2,474 |
Corporate debt securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (574) | (1)
AFS, Less than 12 months, Fair value | 16,758 | 3,164
AFS, Twelve months or more, Gross unrealized losses | 0 | 0
AFS, Twelve months or more, Fair value | 0 | 0
AFS, Total, Gross unrealized losses | (574) | (1)
AFS, Total, Fair value | 16,758 | 3,164
U.S. Treasury securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (1,541) | (173)
AFS, Less than 12 months, Fair value | 21,723 | 23,175
AFS, Twelve months or more, Gross unrealized losses | 0 | 0
AFS, Twelve months or more, Fair value | 0 | 0
AFS, Total, Gross unrealized losses | (1,541) | (173)
AFS, Total, Fair value | $ 21,723 | $ 23,175

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