Borrowings (Advances from FHLB and Respective Maturity Schedule) (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Maturity:
One Year	$ 280,000	$ 250,000
Two Years	75,000	0
Three Years	160,000	75,000
Four Years	80,000	160,000
Five Years	80,000	80,000
After five years	10,000	90,000
Total advances from FHLB	$ 685,000	$ 655,000
Maturity:
One Year	0.38%	0.20%
Two Years	3.48%	0.00%
Three years	2.45%	3.48%
Four years	3.50%	2.45%
Five years	3.54%	3.50%
After five years	3.49%	3.53%
Total advances from FHLB	1.98%	1.99%