SECURITIES (Details 2) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Available for sale:
Less than 12 months, Estimated Fair Value	$ 240,441	$ 236,848
Less than 12 months, Gross Unrealized losses	(5,570)	(2,666)
Greater than 12 months, Estimated Fair Value	477,397	481,253
Greater than 12 months, Gross Unrealized losses	(19,062)	(13,627)
Held to maturity:
Less than 12 months, Estimated Fair Value	73,161	49,527
Less than 12 months, Gross Unrealized losses	(1,245)	(404)
Greater than 12 months, Estimated Fair Value	58,233	60,518
Greater than 12 months, Gross Unrealized losses	(2,690)	(1,870)
U.S. GSE securities
Available for sale:
Less than 12 months, Estimated Fair Value	0	0
Less than 12 months, Gross Unrealized losses	0	0
Greater than 12 months, Estimated Fair Value	56,038	56,815
Greater than 12 months, Gross Unrealized losses	(1,957)	(1,180)
State and municipal obligations
Available for sale:
Less than 12 months, Estimated Fair Value	51,188	35,350
Less than 12 months, Gross Unrealized losses	(630)	(301)
Greater than 12 months, Estimated Fair Value	29,283	28,165
Greater than 12 months, Gross Unrealized losses	(705)	(518)
Held to maturity:
Less than 12 months, Estimated Fair Value	23,435	7,709
Less than 12 months, Gross Unrealized losses	(255)	(57)
Greater than 12 months, Estimated Fair Value	1,005	1,009
Greater than 12 months, Gross Unrealized losses	(5)	(7)
U.S. GSE residential mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value	91,424	107,408
Less than 12 months, Gross Unrealized losses	(2,353)	(1,153)
Greater than 12 months, Estimated Fair Value	80,300	69,571
Greater than 12 months, Gross Unrealized losses	(3,089)	(1,680)
Held to maturity:
Less than 12 months, Estimated Fair Value	1,276	1,359
Less than 12 months, Gross Unrealized losses	(32)	(16)
Greater than 12 months, Estimated Fair Value	9,279	9,804
Greater than 12 months, Gross Unrealized losses	(401)	(245)
U.S. GSE residential collateralized mortgage obligations
Available for sale:
Less than 12 months, Estimated Fair Value	78,440	77,705
Less than 12 months, Gross Unrealized losses	(1,748)	(759)
Greater than 12 months, Estimated Fair Value	212,234	224,932
Greater than 12 months, Gross Unrealized losses	(8,485)	(6,257)
Held to maturity:
Less than 12 months, Estimated Fair Value	24,359	21,329
Less than 12 months, Gross Unrealized losses	(358)	(94)
Greater than 12 months, Estimated Fair Value	20,142	21,112
Greater than 12 months, Gross Unrealized losses	(795)	(572)
U.S. GSE commercial mortgage-backed securities
Available for sale:
Less than 12 months, Estimated Fair Value	5,856	2,345
Less than 12 months, Gross Unrealized losses	(120)	(40)
Greater than 12 months, Estimated Fair Value	0	0
Greater than 12 months, Gross Unrealized losses	0	0
Held to maturity:
Less than 12 months, Estimated Fair Value	13,975	8,789
Less than 12 months, Gross Unrealized losses	(276)	(121)
Greater than 12 months, Estimated Fair Value	8,057	8,303
Greater than 12 months, Gross Unrealized losses	(443)	(317)
U.S. GSE commercial collateralized mortgage obligations
Available for sale:
Less than 12 months, Estimated Fair Value	252	452
Less than 12 months, Gross Unrealized losses	0	(1)
Greater than 12 months, Estimated Fair Value	46,240	48,264
Greater than 12 months, Gross Unrealized losses	(1,878)	(1,248)
Held to maturity:
Less than 12 months, Estimated Fair Value	10,116	10,341
Less than 12 months, Gross Unrealized losses	(324)	(116)
Greater than 12 months, Estimated Fair Value	19,750	20,290
Greater than 12 months, Gross Unrealized losses	(1,046)	(729)
Other asset backed securities
Available for sale:
Less than 12 months, Estimated Fair Value	0	0
Less than 12 months, Gross Unrealized losses	0	0
Greater than 12 months, Estimated Fair Value	23,401	23,401
Greater than 12 months, Gross Unrealized losses	(849)	(849)
Corporate bonds
Available for sale:
Less than 12 months, Estimated Fair Value	13,281	13,588
Less than 12 months, Gross Unrealized losses	(719)	(412)
Greater than 12 months, Estimated Fair Value	29,901	30,105
Greater than 12 months, Gross Unrealized losses	$ (2,099)	$ (1,895)