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SECURITIES AVAILABLE FOR SALE - Summary of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Gross Unrealized Losses |  |
Less Than Twelve Months | $ 517 | $ 2,565
Over Twelve Months | 13,658 | 5,212
Total | 14,175 | 7,777
Fair Value |  |
Less Than Twelve Months | 50,873 | 251,956
Over Twelve Months | 428,272 | 175,168
Total | 479,145 | 427,124
US Government-sponsored enterprises |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 155 | 1,895
Over Twelve Months | 9,289 | 3,921
Total | 9,444 | 5,816
Fair Value |  |
Less Than Twelve Months | 19,367 | 189,486
Over Twelve Months | 297,569 | 117,156
Total | 316,936 | 306,642
US Government agency |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 16 | 559
Over Twelve Months | 1,919 | 615
Total | 1,935 | 1,174
Fair Value |  |
Less Than Twelve Months | 2,570 | 45,221
Over Twelve Months | 68,266 | 30,155
Total | 70,836 | 75,376
Private label |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 79 | 0
Over Twelve Months | 5 | 5
Total | 84 | 5
Fair Value |  |
Less Than Twelve Months | 10,393 | 8
Over Twelve Months | 47 | 130
Total | 10,440 | 138
Obligations of states and political subdivisions thereof |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 43 | 58
Over Twelve Months | 2,033 | 671
Total | 2,076 | 729
Fair Value |  |
Less Than Twelve Months | 6,784 | 8,298
Over Twelve Months | 47,930 | 27,727
Total | 54,714 | 36,025
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 224 | 53
Over Twelve Months | 412 | 0
Total | 636 | 53
Fair Value |  |
Less Than Twelve Months | 11,759 | 8,943
Over Twelve Months | 14,460 | 0
Total | $ 26,219 | $ 8,943

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