BORROWINGS (Advances from FHLB and Respective Maturity Schedule) (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Maturity:
One Year	$ 575,000	$ 470,000
Two Years	80,000	150,000
Three Years	100,833	80,000
Four Years	10,000	80,000
Five Years	0	10,000
After five years	0	0
Total advances from FHLB	$ 765,833	$ 790,000
Maturity:
One Year	1.43%	0.65%
Two Years	3.50%	2.40%
Three years	3.13%	3.50%
Four years	3.49%	3.54%
Five years	0.00%	3.49%
After five years	0.00%	0.00%
Total advances from FHLB	1.89%	1.60%