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LOANS AND ALLOWANCE FOR LOAN LOSSES - Narrative (Detail) | 12 Months Ended
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Dec. 31, 2017 USD ($) note | Dec. 31, 2016 USD ($) note | Dec. 31, 2015 USD ($)
Receivables [Abstract] |  |  |
Maximum percentage of loan-to-value ratio upon loan origination (no more than) | 80.00% |  |
Maximum percentage of loan-to-value ratios of the value of the real estate taken as collateral (no greater than) | 90.00% |  |
Amount of loan on which reviews have been made annually | $ 500,000 |  |
Amount of loan on which reviews require approval | $ 250,000 |  |
Period past due when loans are deemed impaired | 90 days |  |
Number of notes split | note | 2 |  |
Appraisals, required period interval | 18 months |  |
Minimum amount on which annual updated appraisals for criticized loans are required | $ 250,000 |  |
Percentage of strong loan-to-value (or lower) | 70.00% |  |
Number of notes sold | note |  | 1 |
Note carrying amount |  | $ 5,946,000 |
Proceeds from sale of note | $ 2,195,000 | 5,100,000 | $ 0
Net charge-off to the ALL |  | $ 846,000 |

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- Definition Amount Of Loan On Which Reviews Require Approval + References No definition available. + Details
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- Definition Percentage of loan to value ratio of value of real estate taken as collateral. + References No definition available. + Details
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- Definition Percentage of loan to value ratio upon loan origination. + References No definition available. + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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