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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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