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INVESTMENT SECURITIES - Continuous Unrealized Loss on Investment (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
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AFS |  |
AFS, Less than 12 months, Gross unrealized losses | $ (75,797) | $ (2,503)
AFS, Less than 12 months, Fair value | 987,402 | 181,901
AFS, Twelve months or more, Gross unrealized losses | (8,657) | (822)
AFS, Twelve months or more, Fair value | 39,089 | 15,712
AFS, Total, Gross unrealized losses | (84,454) | (3,325)
AFS, Total, Fair value | 1,026,491 | 197,613
Residential mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (2,106) | (38)
AFS, Less than 12 months, Fair value | 60,558 | 5,324
AFS, Twelve months or more, Gross unrealized losses | (558) | (300)
AFS, Twelve months or more, Fair value | 2,089 | 2,406
AFS, Total, Gross unrealized losses | (2,664) | (338)
AFS, Total, Fair value | 62,647 | 7,730
Commercial mortgage-backed securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (6,503) | (235)
AFS, Less than 12 months, Fair value | 63,553 | 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 | (6,503) | (235)
AFS, Total, Fair value | 63,553 | 18,127
Residential collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (14,699) | (1,007)
AFS, Less than 12 months, Fair value | 263,668 | 53,068
AFS, Twelve months or more, Gross unrealized losses | (3,878) | (314)
AFS, Twelve months or more, Fair value | 19,095 | 7,116
AFS, Total, Gross unrealized losses | (18,577) | (1,321)
AFS, Total, Fair value | 282,763 | 60,184
Commercial collateralized mortgage obligations |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (4,410) | (135)
AFS, Less than 12 months, Fair value | 98,776 | 14,806
AFS, Twelve months or more, Gross unrealized losses | (855) | (198)
AFS, Twelve months or more, Fair value | 7,267 | 5,132
AFS, Total, Gross unrealized losses | (5,265) | (333)
AFS, Total, Fair value | 106,043 | 19,938
Municipal bonds |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (44,369) | (914)
AFS, Less than 12 months, Fair value | 449,658 | 64,237
AFS, Twelve months or more, Gross unrealized losses | (3,366) | (10)
AFS, Twelve months or more, Fair value | 10,638 | 1,058
AFS, Total, Gross unrealized losses | (47,735) | (924)
AFS, Total, Fair value | 460,296 | 65,295
HTM |  |
HFM, Less than 12 months, Gross unrealized losses | (32) |
HFM, Less than 12 months, Fair value | 2,443 |
HFM, 12 months or more, Gross unrealized losses | 0 |
HFM, 12 months or more, Fair value | 0 |
HFM, Total, Gross unrealized losses | (32) |
HTM, Total, Fair value | 2,443 |
Corporate debt securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (1,462) | (1)
AFS, Less than 12 months, Fair value | 30,259 | 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 | (1,462) | (1)
AFS, Total, Fair value | 30,259 | 3,164
U.S. Treasury securities |  |
AFS |  |
AFS, Less than 12 months, Gross unrealized losses | (2,248) | (173)
AFS, Less than 12 months, Fair value | 20,930 | 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 | (2,248) | (173)
AFS, Total, Fair value | $ 20,930 | $ 23,175

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