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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) segment | Jun. 30, 2017 USD ($) | Dec. 31, 2015 investment | Dec. 31, 2017 USD ($)
Accounting Policies [Abstract] |  |  |  |  |  |
Maturity of interest bearing deposits |  |  | 90 days |  |  |
Evaluation period to return past due loans to accrual status |  |  | 6 months |  |  |
Balance of loans serviced for others | $ 336,428 |  | $ 336,428 |  |  | $ 334,802
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Mortgage servicing rights | 2,917 |  | 2,917 |  |  | 2,897
Foreclosed real estate | $ 395 |  | $ 395 |  |  | 961
Percentage of limited partner interest | 99.00% |  | 99.00% |  |  |
Number of investments accounted for under the proportional amortization method | investment |  |  |  |  | 1 |
Investment in real estate partnership | $ 4,140 |  | $ 4,140 |  |  | 4,416
Investment in real estate partnerships, proportional amortization method | 1,669 |  | 1,669 |  |  | $ 1,776
Loss investment in real estate partnership | 88 | $ 26 | 169 | $ 115 |  |
Losses on investments accounted for under the proportional amortization method | 54 | 52 | 107 | 105 |  |
Recognition of federal tax credits | 145 | 252 | 289 | 505 |  |
Advertising expense | $ 61 | $ 214 | $ 126 | $ 317 |  |
Number of significant operating segments | segment |  |  | 1 |  |  |
Building and Improvements | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Plant and equipment, useful life |  |  | 10 years |  |  |
Building and Improvements | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Plant and equipment, useful life |  |  | 40 years |  |  |
Furniture and Equipment | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Plant and equipment, useful life |  |  | 3 years |  |  |
Furniture and Equipment | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Plant and equipment, useful life |  |  | 15 years |  |  |
Deposit Premium |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite lives of intangible assets |  |  | 10 years |  |  |
Customer Lists | Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite lives of intangible assets |  |  | 10 years |  |  |
Customer Lists | Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite lives of intangible assets |  |  | 15 years |  |  |

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