DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Maturities of Time Deposits [Abstract]
Maturing in one year or less	$ 765,406
Maturing after one year through two years	159,436
Maturing after two years through three years	60,932
Maturing after three years through four years	26,238
Maturing after four years through five years	29,912
Maturing after five years	3,409
Total certificates of deposit	$ 1,045,333	$ 1,353,870
Weighted Average Rate [Abstract]
Maturing in one year or less	0.45%
Maturing after one year through two years	0.76%
Maturing after two years through three years	0.88%
Maturing after three years through four years	1.19%
Maturing after four years through five years	1.06%
Maturing after five years	1.26%
Total certificates of deposits	0.56%