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SECURITIES AVAILABLE FOR SALE - Summary of AFS Securities with Unrealized Losses (Details) $ in Thousands | Sep. 30, 2018 USD ($) security | Dec. 31, 2017 USD ($) security
--- | --- | ---
Number of Securities |  |
Less Than 12 Months | security | 60 | 19
12 Months or More | security | 17 | 6
Total | security | 77 | 25
Fair Value |  |
Less Than 12 Months | $ 222,587 | $ 117,391
12 Months or More | 87,419 | 43,044
Total | 310,006 | 160,435
Unrealized Losses |  |
Less Than 12 Months | 3,061 | 1,968
12 Months or More | 5,676 | 1,926
Total | $ 8,737 | $ 3,894
States and political subdivisions |  |
Number of Securities |  |
Less Than 12 Months | security | 46 | 7
12 Months or More | security | 5 | 1
Total | security | 51 | 8
Fair Value |  |
Less Than 12 Months | $ 67,649 | $ 24,577
12 Months or More | 22,667 | 5,585
Total | 90,316 | 30,162
Unrealized Losses |  |
Less Than 12 Months | 1,591 | 473
12 Months or More | 1,386 | 5
Total | $ 2,977 | $ 478
GSE residential CMOs |  |
Number of Securities |  |
Less Than 12 Months | security | 4 | 4
12 Months or More | security | 7 | 5
Total | security | 11 | 9
Fair Value |  |
Less Than 12 Months | $ 59,708 | $ 25,155
12 Months or More | 46,729 | 37,459
Total | 106,437 | 62,614
Unrealized Losses |  |
Less Than 12 Months | 1,125 | 914
12 Months or More | 3,595 | 1,921
Total | $ 4,720 | $ 2,835
Private label residential CMOs |  |
Number of Securities |  |
Less Than 12 Months | security | 1 |
12 Months or More | security | 0 |
Total | security | 1 |
Fair Value |  |
Less Than 12 Months | $ 312 |
12 Months or More | 0 |
Total | 312 |
Unrealized Losses |  |
Less Than 12 Months | 1 |
12 Months or More | 0 |
Total | $ 1 |
Private label commercial CMOs |  |
Number of Securities |  |
Less Than 12 Months | security | 5 | 2
12 Months or More | security | 2 | 0
Total | security | 7 | 2
Fair Value |  |
Less Than 12 Months | $ 33,258 | $ 7,653
12 Months or More | 6,597 | 0
Total | 39,855 | 7,653
Unrealized Losses |  |
Less Than 12 Months | 70 | 156
12 Months or More | 298 | 0
Total | $ 368 | $ 156
Asset-backed and other |  |
Number of Securities |  |
Less Than 12 Months | security | 4 | 6
12 Months or More | security | 3 | 0
Total | security | 7 | 6
Fair Value |  |
Less Than 12 Months | $ 61,660 | $ 60,006
12 Months or More | 11,426 | 0
Total | 73,086 | 60,006
Unrealized Losses |  |
Less Than 12 Months | 274 | 425
12 Months or More | 397 | 0
Total | $ 671 | $ 425

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