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INVESTMENT SECURITIES - Summary of AFS Securities with Unrealized Losses (Details) $ in Thousands | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Number of Securities |  |
Less Than 12 Months | security | 17 | 63
12 Months or More | security | 92 | 46
Total | security | 109 | 109
Fair Value |  |
Less Than 12 Months | $ 27,107 | $ 295,839
12 Months or More | 407,702 | 206,080
Total | 434,809 | 501,919
Unrealized Losses |  |
Less Than 12 Months | 1,394 | 20,185
12 Months or More | 57,925 | 29,855
Total | $ 59,319 | $ 50,040
U.S. Treasury securities |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 0
12 Months or More | security | 3 | 3
Total | security | 3 | 3
Fair Value |  |
Less Than 12 Months | $ 0 | $ 0
12 Months or More | 17,143 | 17,291
Total | 17,143 | 17,291
Unrealized Losses |  |
Less Than 12 Months | 0 | 0
12 Months or More | 2,917 | 2,779
Total | $ 2,917 | $ 2,779
States and political subdivisions |  |
Number of Securities |  |
Less Than 12 Months | security | 10 | 29
12 Months or More | security | 41 | 17
Total | security | 51 | 46
Fair Value |  |
Less Than 12 Months | $ 4,147 | $ 135,579
12 Months or More | 183,970 | 60,102
Total | 188,117 | 195,681
Unrealized Losses |  |
Less Than 12 Months | 294 | 13,809
12 Months or More | 35,396 | 14,621
Total | $ 35,690 | $ 28,430
GSE residential MBSs |  |
Number of Securities |  |
Less Than 12 Months | security | 0 | 5
12 Months or More | security | 15 | 10
Total | security | 15 | 15
Fair Value |  |
Less Than 12 Months | $ 0 | $ 26,100
12 Months or More | 57,351 | 33,302
Total | 57,351 | 59,402
Unrealized Losses |  |
Less Than 12 Months | 0 | 925
12 Months or More | 5,044 | 3,451
Total | $ 5,044 | $ 4,376
GSE residential CMOs |  |
Number of Securities |  |
Less Than 12 Months | security | 5 | 8
12 Months or More | security | 14 | 9
Total | security | 19 | 17
Fair Value |  |
Less Than 12 Months | $ 16,044 | $ 28,732
12 Months or More | 55,993 | 39,646
Total | 72,037 | 68,378
Unrealized Losses |  |
Less Than 12 Months | 581 | 1,884
12 Months or More | 8,075 | 5,184
Total | $ 8,656 | $ 7,068
Non-agency CMOs |  |
Number of Securities |  |
Less Than 12 Months | security | 1 | 4
12 Months or More | security | 4 | 2
Total | security | 5 | 6
Fair Value |  |
Less Than 12 Months | $ 6,024 | $ 26,555
12 Months or More | 15,868 | 8,639
Total | 21,892 | 35,194
Unrealized Losses |  |
Less Than 12 Months | 512 | 1,135
12 Months or More | 4,555 | 1,648
Total | $ 5,067 | $ 2,783
Asset-backed |  |
Number of Securities |  |
Less Than 12 Months | security | 1 | 17
12 Months or More | security | 15 | 5
Total | security | 16 | 22
Fair Value |  |
Less Than 12 Months | $ 892 | $ 78,873
12 Months or More | 77,377 | 47,100
Total | 78,269 | 125,973
Unrealized Losses |  |
Less Than 12 Months | 7 | 2,432
12 Months or More | 1,938 | 2,172
Total | $ 1,945 | $ 4,604

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