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BUSINESS COMBINATION- Business Combination (Detail) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Feb. 27, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Fair Value Of Assets Acquired	$ 540,339
Liabilities [Abstract]
Business Combination Bargain Purchase Gain Recognized Amount	13,443	$ 0	$ 0	$ 13,443
Deposits [Member]
Liabilities [Abstract]
Liabilities Assumed1	523,517	0	0	523,517
Other Liabilities [Member]
Liabilities [Abstract]
Liabilities Assumed1	3,379
Core Deposits [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	5,820	0	0	5,820
Property Plant And Equipment [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	5,450	0	0	5,450
Cash [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	217,659
Loans [Member]
Assets [Abstract]
Fair Value Of Assets Acquired	$ 311,410	$ 0	$ 0	$ 311,410

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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The fair value of assets acquired in noncash investing or financing activities.

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