BUSINESS COMBINATION- Business Combination (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 27, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Assets [Abstract]
Fair Value Of Assets Acquired	$ 540,339
Liabilities [Abstract]
Business Combination Bargain Purchase Gain Recognized Amount	13,443	$ 0	$ 13,443	$ 0
Deposits [Member]
Liabilities [Abstract]
Liabilities Assumed1	523,517	0	523,517	0
Other Liabilities [Member]
Liabilities [Abstract]
Liabilities Assumed1	3,379
Core Deposits [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	5,820	0	5,820	0
Property Plant And Equipment [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	5,450	0	5,450	0
Cash [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	217,659
Loans [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	$ 311,410	$ 0	$ 311,410	$ 0