DEPOSITS DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Maturities of Time Deposits [Abstract]
Maturing in one year or less		$ 879,988
Maturing after one year through two years		174,336
Maturing after two years through three years		97,508
Maturing after three years through four years		15,864
Maturing after four years through five years		10,676
Maturing after five years		2,302
Total certificates of deposit	[1]	$ 1,180,674	$ 966,937
Weighted Average Rate [Abstract]
Maturing in one year or less		1.08%
Maturing after one year through two years		1.11%
Maturing after two years through three years		1.45%
Maturing after three years through four years		1.21%
Maturing after four years through five years		1.54%
Maturing after five years		1.07%
Total certificates of deposit		1.12%

[1] Certificates of deposit include $0 and $11,000 of acquisition premiums at September 30, 2018 and December 31, 2017, respectively.