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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Jan. 01, 2018 USD ($) | Feb. 21, 2017 | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |
Reserve requirements of vault cash and/or deposits, included in cash and equivalents |  |  |  | $ 15,800 |  | $ 12,700
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Contract with customer |  | $ 241 |  |  |  |
Conversion ratio on stock split |  |  | 1.5 |  |  |
Premises | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful live of premises and equipment |  |  |  | 25 years |  |
Premises | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful live of premises and equipment |  |  |  | 39 years |  |
Furniture and equipment | Minimum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful live of premises and equipment |  |  |  | 3 years |  |
Furniture and equipment | Maximum |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Estimated useful live of premises and equipment |  |  |  | 7 years |  |
Retained earnings |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Decrease to accumulated comprehensive income after adoption of ASU 2018-02 | $ 980 |  |  | $ (980) |  |
Retained earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Modified retrospective basis adoption of Revenue Recognition Accounting Codification Standard 606 |  |  |  |  |  | $ 184
Scenario, Forecast | Subsequent Event | Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  | $ 9,000 |
Operating Lease, Liability |  |  |  |  | $ 9,000 |

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