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MERGERS AND ACQUISITIONS - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	May 01, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 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			$ 6,200,000		$ 9,700,000
Unaudited pro forma revenue			27,600,000		50,900,000
Merger related expenses		$ 0	$ 6,860,000	$ 0	$ 7,505,000
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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