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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