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INVESTMENT SECURITIES - Continuous Unrealized Loss on Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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AFS |  |
AFS, Less than 12 months, Gross unrealized losses | $ (120,581) | $ (2,503)
AFS, Less than 12 months, Fair value | 1,173,366 | 181,901
AFS, Twelve months or more, Gross unrealized losses | (18,941) | (822)
AFS, Twelve months or more, Fair value | 73,529 | 15,712
AFS, Total, Gross unrealized losses | (139,522) | (3,325)
AFS, Total, Fair value | 1,246,895 | 197,613
Residential mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (9,164) | (38)
AFS, Less than 12 months, Fair value | 195,834 | 5,324
AFS, Twelve months or more, Gross unrealized losses | (653) | (300)
AFS, Twelve months or more, Fair value | 1,964 | 2,406
AFS, Total, Gross unrealized losses | (9,817) | (338)
AFS, Total, Fair value | 197,798 | 7,730
Commercial mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (9,182) | (235)
AFS, Less than 12 months, Fair value | 56,380 | 18,127
AFS, Twelve months or more, Gross unrealized losses | (652) | 0
AFS, Twelve months or more, Fair value | 2,476 | 0
AFS, Total, Gross unrealized losses | (9,834) | (235)
AFS, Total, Fair value | 58,856 | 18,127
Residential collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (29,963) | (1,007)
AFS, Less than 12 months, Fair value | 407,507 | 53,068
AFS, Twelve months or more, Gross unrealized losses | (6,058) | (314)
AFS, Twelve months or more, Fair value | 22,157 | 7,116
AFS, Total, Gross unrealized losses | (36,021) | (1,321)
AFS, Total, Fair value | 429,664 | 60,184
Commercial collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (5,731) | (135)
AFS, Less than 12 months, Fair value | 83,623 | 14,806
AFS, Twelve months or more, Gross unrealized losses | (1,294) | (198)
AFS, Twelve months or more, Fair value | 7,238 | 5,132
AFS, Total, Gross unrealized losses | (7,025) | (333)
AFS, Total, Fair value | 90,861 | 19,938
Municipal bonds |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (62,825) | (914)
AFS, Less than 12 months, Fair value | 391,637 | 64,237
AFS, Twelve months or more, Gross unrealized losses | (7,764) | (10)
AFS, Twelve months or more, Fair value | 24,560 | 1,058
AFS, Total, Gross unrealized losses | (70,589) | (924)
AFS, Total, Fair value | 416,197 | 65,295
HTM |  |
HFM, Less than 12 months, Gross unrealized losses | (101) |
HFM, Less than 12 months, Fair value | 2,998 |
HFM, 12 months or more, Gross unrealized losses | 0 |
HFM, 12 months or more, Fair value | 0 |
HFM, Total, Gross unrealized losses | (101) |
HTM, Total, Fair value | 2,998 |
Corporate debt securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (2,971) | (1)
AFS, Less than 12 months, Fair value | 33,692 | 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 | (2,971) | (1)
AFS, Total, Fair value | 33,692 | 3,164
U.S. Treasury securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (745) | (173)
AFS, Less than 12 months, Fair value | 4,693 | 23,175
AFS, Twelve months or more, Gross unrealized losses | (2,520) | 0
AFS, Twelve months or more, Fair value | 15,134 | 0
AFS, Total, Gross unrealized losses | (3,265) | (173)
AFS, Total, Fair value | $ 19,827 | $ 23,175

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