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MERGERS AND ACQUISITIONS - Narrative (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
May 01, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Apr. 30, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill |  | $ 18,724,000 |  | $ 18,724,000 |  | $ 19,925,000 |  | $ 12,592,000
Unaudited pro forma net Income |  |  | $ 7,600,000 |  | $ 13,400,000 |  |  |
Unaudited pro forma revenue |  |  | 38,700,000 |  | 95,700,000 |  |  |
Merger related expenses |  | $ 0 | $ 500,000 | $ 0 | $ 8,000,000.0 |  |  |
Hamilton Bancorp, Inc. |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Percentage of ownership interests acquired | 100.00% |  |  |  |  |  |  |
Acquisition, cash paid | $ 14,197,000 |  |  |  |  |  |  |
Consideration paid | 50,819,000 |  |  |  |  |  |  |
Total assets acquired excluding goodwill | 494,000,000.0 |  |  |  |  |  |  |
Loans | 347,143,000 |  |  |  |  |  |  |
Total liabilities assumed | 449,358,000 |  |  |  |  |  |  |
Deposits | 388,246,000 |  |  |  |  |  |  |
Goodwill | 6,132,000 |  |  |  |  |  |  |
Core deposit intangible | $ 4,550,000 |  |  |  |  |  |  |
Core deposit intangible amortization period | 10 years |  |  |  |  |  |  |
Hamilton Bancorp, Inc. | Common Stock |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Shares issued for common stock (in shares) | 1,765,704 |  |  |  |  |  |  |
Price per share (in usd per share) |  |  |  |  |  |  | $ 20.74 |

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