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SECURITIES AVAILABLE FOR SALE - Summary of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross Unrealized Losses |  |
Less Than Twelve Months | $ 7,485 | $ 2,565
Over Twelve Months | 8,449 | 5,212
Total | 15,934 | 7,777
Fair Value |  |
Less Than Twelve Months | 386,640 | 251,956
Over Twelve Months | 173,367 | 175,168
Total | 560,007 | 427,124
Obligations of US Government sponsored enterprises |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 6 |
Over Twelve Months | 0 |
Total | 6 |
Fair Value |  |
Less Than Twelve Months | 3,978 |
Over Twelve Months | 0 |
Total | 3,978 |
US Government-sponsored enterprises |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 5,388 | 1,895
Over Twelve Months | 5,876 | 3,921
Total | 11,264 | 5,816
Fair Value |  |
Less Than Twelve Months | 267,678 | 189,486
Over Twelve Months | 117,825 | 117,156
Total | 385,503 | 306,642
US Government agency |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 1,168 | 559
Over Twelve Months | 997 | 615
Total | 2,165 | 1,174
Fair Value |  |
Less Than Twelve Months | 49,816 | 45,221
Over Twelve Months | 28,727 | 30,155
Total | 78,543 | 75,376
Private label |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 0 | 0
Over Twelve Months | 5 | 5
Total | 5 | 5
Fair Value |  |
Less Than Twelve Months | 1 | 8
Over Twelve Months | 56 | 130
Total | 57 | 138
Obligations of states and political subdivisions thereof |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 475 | 58
Over Twelve Months | 1,571 | 671
Total | 2,046 | 729
Fair Value |  |
Less Than Twelve Months | 39,618 | 8,298
Over Twelve Months | 26,759 | 27,727
Total | 66,377 | 36,025
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 448 | 53
Over Twelve Months | 0 | 0
Total | 448 | 53
Fair Value |  |
Less Than Twelve Months | 25,549 | 8,943
Over Twelve Months | 0 | 0
Total | $ 25,549 | $ 8,943

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