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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