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SECURITIES AVAILABLE FOR SALE - Summary of Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Gross Unrealized Losses |  |
Less Than Twelve Months | $ 7,942 | $ 2,565
Over Twelve Months | 15,757 | 5,212
Total | 23,699 | 7,777
Fair Value |  |
Less Than Twelve Months | 335,033 | 251,956
Over Twelve Months | 284,353 | 175,168
Total | 619,386 | 427,124
Obligations of US Government-sponsored enterprises |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 1 |
Over Twelve Months | 0 |
Total | 1 |
Fair Value |  |
Less Than Twelve Months | 3,997 |
Over Twelve Months | 0 |
Total | 3,997 |
US Government-sponsored enterprises |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 5,882 | 1,895
Over Twelve Months | 10,909 | 3,921
Total | 16,791 | 5,816
Fair Value |  |
Less Than Twelve Months | 213,267 | 189,486
Over Twelve Months | 193,006 | 117,156
Total | 406,273 | 306,642
US Government agency |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 545 | 559
Over Twelve Months | 2,647 | 615
Total | 3,192 | 1,174
Fair Value |  |
Less Than Twelve Months | 47,373 | 45,221
Over Twelve Months | 59,364 | 30,155
Total | 106,737 | 75,376
Private label |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 1 | 0
Over Twelve Months | 4 | 5
Total | 5 | 5
Fair Value |  |
Less Than Twelve Months | 114 | 8
Over Twelve Months | 50 | 130
Total | 164 | 138
Obligations of states and political subdivisions thereof |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 892 | 58
Over Twelve Months | 2,197 | 671
Total | 3,089 | 729
Fair Value |  |
Less Than Twelve Months | 44,817 | 8,298
Over Twelve Months | 31,933 | 27,727
Total | 76,750 | 36,025
Corporate bonds |  |
Gross Unrealized Losses |  |
Less Than Twelve Months | 621 | 53
Over Twelve Months | 0 | 0
Total | 621 | 53
Fair Value |  |
Less Than Twelve Months | 25,465 | 8,943
Over Twelve Months | 0 | 0
Total | $ 25,465 | $ 8,943

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