DEPOSITS DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Maturities of Time Deposits [Abstract]
Maturing in one year or less		$ 934,503
Maturing after one year through two years		183,851
Maturing after two years through three years		74,500
Maturing after three years through four years		11,404
Maturing after four years through five years		12,015
Maturing after five years		2,318
Total certificates of deposit	[1]	$ 1,218,591	$ 1,320,265
Weighted Average Rate [Abstract]
Maturing in one year or less		1.32%
Maturing after one year through two years		1.76%
Maturing after two years through three years		1.99%
Maturing after three years through four years		1.60%
Maturing after four years through five years		2.29%
Maturing after five years		1.15%
Total certificates of deposit		1.44%

[1] Certificates of deposit include $312,000 and $563,000 of acquisition premiums at September 30, 2019 and December 31, 2018, respectively.