SECURITIES (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Other than Temporary Impairment Losses, Investments [Abstract]
Guaranteed portion of student loan backed bonds		Student loan backed bonds which are guaranteed by the U.S. Department of Education for 97% to 100% of principal.
Credit support for student loan backed bonds description		The bonds have credit support of 3% to 5
Proceeds from sales of securities available for sale	$ 235,700		$ 264,358
Gross gains realized on sale of securities available for sale	1,300		1,600
Gross losses realized on sale of securities available for sale	900		1,200
Proceeds from calls of securities	$ 22,300		$ 53,000
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings		$ 549,400		$ 570,100
Amount owned in FHLB, ACBB and FRB stock		$ 38,819		$ 34,743