SECURITIES (Detail Textuals) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Other than Temporary Impairment Losses, Investments [Abstract]
Proceeds from sales of securities available for sale	$ 235,700		$ 264,358	$ 73,788
Gross gains realized on sale of securities available for sale	1,300		1,600	500
Gross losses realized on sale of securities available for sale	900		1,200	500
Proceeds from calls of securities	22,300	$ 10,300	53,000	$ 10,500
Fair value of securities pledged to secure public deposits and FHLB and FRB overnight borrowings	650,900		650,900		$ 611,000
Amount owned in FHLB, ACBB and FRB stock	$ 20,894		$ 20,894		$ 24,788