MERGERS AND ACQUISITIONS AND BRANCH CONSOLIDATIONS - Narrative (Details) $ / shares in Units, ft² in Thousands, $ in Thousands		3 Months Ended	12 Months Ended
	May 01, 2019 USD ($) shares	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) loanProductionOffice branchLocation	Dec. 31, 2019 USD ($)	Dec. 31, 2021 USD ($)	Oct. 31, 2019 ft² branchLocation	Apr. 30, 2019 $ / shares
Business Acquisition [Line Items]
Closing stock price per share (in shares) | $ / shares							$ 20.74
Goodwill		$ 19,925	$ 18,724	$ 19,925	$ 18,724
Unaudited pro forma net income				20,900
Pro forma revenue				102,500
Merger related expenses				8,000
Number of bank branch locations | branchLocation			6
Number of loan production offices | loanProductionOffice			3
Consolidation of operations expenses		988	$ 1,600
Lease termination costs		126	$ 1,300
Fixed asset writedowns		762
Severance and other		100
Assets held for sale		$ 4,900		4,900
Pennsylvania Branch Locations
Business Acquisition [Line Items]
Number of bank branch locations | branchLocation						5
Square feet of excess back office space | ft²						50
Investment Banking, Legal and Consulting Fees
Business Acquisition [Line Items]
Merger related expenses				2,000
Information Systems
Business Acquisition [Line Items]
Merger related expenses				2,100
Other Expenses
Business Acquisition [Line Items]
Merger related expenses				$ 3,900
Hamilton Bancorp, Inc.
Business Acquisition [Line Items]
Percentage of interests acquired	100.00%
Cash paid	$ 14,197
Consideration paid	50,819
Assets acquired excluding goodwill	494,000
Loans acquired	347,143
Securities available for sale	60,882
Total liabilities assumed	449,358
Deposits	388,246
Goodwill	6,132
Core deposit intangible	4,550
Hamilton Bancorp, Inc. | Core deposit intangibles
Business Acquisition [Line Items]
Core deposit intangible	$ 4,600
Amortization period	10 years
Hamilton Bancorp, Inc. | Common Stock
Business Acquisition [Line Items]
Shares of common stock issued for acquisition (in shares) | shares	1,765,704