DEPOSITS DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) - USD ($) $ in Thousands		Mar. 31, 2017	Dec. 31, 2016
Maturities of Time Deposits [Abstract]
Maturing in one year or less		$ 866,735
Maturing after one year through two years		138,626
Maturing after two years through three years		84,991
Maturing after three years through four years		24,832
Maturing after four years through five years		26,310
Maturing after five years		3,224
Total certificates of deposit	[1]	$ 1,144,718	$ 1,045,333
Weighted Average Rate [Abstract]
Maturing in one year or less		0.46%
Maturing after one year through two years		0.75%
Maturing after two years through three years		1.07%
Maturing after three years through four years		1.17%
Maturing after four years through five years		1.10%
Maturing after five years		1.27%
Total certificates of deposit		0.57%

[1] Certificates of deposit include $293,000 and $426,000 of acquisition premiums at March 31, 2017 and December 31, 2016, respectively.