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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2008 USD ($)	Dec. 31, 2020 USD ($) loan item employee shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Feb. 23, 2021 $ / shares	Sep. 30, 2020 USD ($) loan	Jun. 30, 2020 USD ($) loan
Tax Credits On Investments In Low Income Housing Partnerships		$ 405,000	$ 405,000
Amortization Of Investments In Limited Partnerships		$ 362,000	353,000
Number of retired employees \| employee		2
Number of loans funded \| loan		441
Loans for which payment relief has been requested		$ 22,976,000
Goodwill impairment		$ 0
Loan Payments Delinquency Period Beyond Which Loans Considered Past Due		10 days
Loan Payments Delinquency Period Beyond Which Loans Considered Non Accrual		90 days
Assets Held-in-trust		$ 107,336,000	111,160,000
Maximum loan to value ratio with PMI		95.00%
Loans Receivable Held-for-sale, Amount		$ 17,300,000	2,292,000
Payments to Acquire Real Estate Held-for-investment		0	85,000	$ 1,430,000	$ 1,430,000	$ 590,000
Operating Lease, Right-of-Use Asset		1,061,000	1,470,000
Operating Lease, Liability		$ 1,513,000	$ 1,663,000
Number of common stock shares outstanding potential \| shares		0	0
Mortgage Loan Service [Member]
Loans Serviced For Others		$ 86,981,000	$ 94,998,000
Servicing Asset at Fair Value, Amount		282,000	283,000
Fees and Commissions, Mortgage Banking and Servicing		231,000	241,000
Amortization of Mortgage Servicing Rights (MSRs)		130,000	112,000
Subsequent Event [Member]
Dividends Payable, Amount Per Share \| $ / shares							$ 0.27
Special dividend payable \| $ / shares							$ 0.01
Unfunded Loan Commitment [Member]
Reserve For Unfunded Lending Commitments		$ 129,000	125,000
Commercial Real Estate Loans [Member] \| Maximum [Member]
Term of Loan Offering		20 years
Maximum Loan to Value Ratio		80.00%
Residential Real Estate [Member] \| Maximum [Member] \| Held for Investment [Member]
Term of Loan Offering		20 years
Residential Real Estate [Member] \| Maximum [Member] \| Residential Mortgage [Member]
Maximum Loan to Value Ratio		80.00%
Residential Real Estate [Member] \| Maximum [Member] \| Home Equity Loan [Member]
Maximum Loan to Value Ratio		80.00%
Residential Real Estate [Member] \| Maximum [Member] \| Home Equity Line of Credit [Member]
Term of Loan Offering		20 years
Maximum Loan to Value Ratio		80.00%
Bank Owned Life Insurance [Member]
Deferred Compensation Arrangement with Individual, Recorded Liability		$ 36,000	38,000
Deferred Compensation Arrangement with Individual, Compensation Expense		2,000	2,000
Pocono Community Bank [Member]
Goodwill, Purchase Accounting Adjustments	$ 152,000
Federal Home Loan Bank of Pittsburgh [Member]
Restricted Investment in Bank Stocks		2,212,000	4,189,000
Atlantic Central Bankers Bank [Member]
Restricted Investment in Bank Stocks		$ 35,000	35,000
Full Service Offices [Member]
Number of Stores		18
Loan Production Office [Member]
Number of Stores \| item		1
Automated Teller [Member]
Number of Stores		20
Government Guaranteed Loans
Government Guaranteed Loans.		$ 5,128,000	$ 6,150,000
Loan Restructuring Modification [Member]
Count \| loan		44						189	490
Investment		$ 16,541,000						$ 74,935,000	$ 163,695,000
Loan Restructuring Modification [Member] \| Residential Real Estate [Member]
Count \| loan		2						6	81
Investment		$ 269,000						$ 1,492,000	$ 8,143,000
Originated For Resale [Member] \| Residential Real Estate [Member] \| Residential Mortgage [Member]
Loans held for sale term		30 years
Originated For Resale [Member] \| Residential Real Estate [Member] \| Maximum [Member] \| Residential Mortgage [Member]
Term of Loan Offering		30 years
Home Equity Term Loans [Member] \| Residential Real Estate [Member] \| Maximum [Member]
Term of Loan Offering		15 years