SECURITIES, Securities with Unrealized Losses in Continuous Unrealized Loss Position (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Continuous unrealized loss position, fair value [Abstract]
Less than 12 months	$ 177,060	$ 152,809
12 months or more	72,564	76,359
Total	249,624	229,168
Continuous unrealized loss position, unrealized loss [Abstract]
Less than 12 months	(3,742)	(1,201)
12 months or more	(2,935)	(1,901)
Total	(6,677)	(3,102)
U.S. Government Sponsored Agency Securities [Member]
Continuous unrealized loss position, fair value [Abstract]
Less than 12 months	7,264	6,780
12 months or more	10,287	10,335
Total	17,551	17,115
Continuous unrealized loss position, unrealized loss [Abstract]
Less than 12 months	(42)	(41)
12 months or more	(187)	(138)
Total	(229)	(179)
U.S. Government Sponsored Agency MBS - Residential [Member]
Continuous unrealized loss position, fair value [Abstract]
Less than 12 months	147,730	134,211
12 months or more	45,086	47,682
Total	192,816	181,893
Continuous unrealized loss position, unrealized loss [Abstract]
Less than 12 months	(3,461)	(1,076)
12 months or more	(1,953)	(1,140)
Total	(5,414)	(2,216)
U.S. Government Sponsored Agency CMO's - Residential [Member]
Continuous unrealized loss position, fair value [Abstract]
Less than 12 months	17,519	8,306
12 months or more	16,720	17,868
Total	34,239	26,174
Continuous unrealized loss position, unrealized loss [Abstract]
Less than 12 months	(184)	(64)
12 months or more	(785)	(617)
Total	(969)	(681)
Obligations of States and Political Subdivisions [Member]
Continuous unrealized loss position, fair value [Abstract]
Less than 12 months	4,547	3,512
12 months or more	471	474
Total	5,018	3,986
Continuous unrealized loss position, unrealized loss [Abstract]
Less than 12 months	(55)	(20)
12 months or more	(10)	(6)
Total	$ (65)	$ (26)