DEPOSITS (Maturities and Weighted Average Interest Rates of Certificates of Deposit) (Details) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Maturities of Time Deposits [Abstract]
Maturing in one year or less		$ 1,001,206
Maturing after one year through two years		201,919
Maturing after two years through three years		90,247
Maturing after three years through four years		13,364
Maturing after four years through five years		11,282
Maturing after five years		2,247
Total certificates of deposit	[1]	$ 1,320,265	$ 966,937
Weighted Average Rate [Abstract]
Maturing in one year or less		1.15%
Maturing after one year through two years		1.09%
Maturing after two years through three years		1.57%
Maturing after three years through four years		1.22%
Maturing after four years through five years		1.75%
Maturing after five years		1.07%
Total certificates of deposits		1.17%

[1] )Certificates of deposit included $563,000 of acquisition discounts at December 31, 2018 and $11,000 of acquisition premiums at December 31, 2017.