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LEASES - Right-of-use Assets and Lease Liabilities (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Jan. 01, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Cash paid for operating lease liabilities |  |  |  | $ 1,122 |
Operating lease right-of-use assets |  |  |  | $ 10,485 |
Weighted-average remaining lease term (in years) | 17 years 7 months 6 days |  |  | 17 years 7 months 6 days |
Weighted-average discount rate | 4.50% |  |  | 4.50% |
Operating lease liabilities | $ 9,688 |  |  | $ 9,688 |
Operating Leases that commenced |  |  | $ 144 |  |
Removal of operating leases | 988 |  |  |  |
Bank Branch Consolidations |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Removal of operating leases | $ 423 |  |  |  |
Hamilton Bancorp, Inc. |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating Leases that commenced |  | $ 2,800 |  |  |
ASU 2016-02 |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Operating lease liabilities |  |  |  |  | $ 8,000

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