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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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