Loans - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) category class contract component	Mar. 31, 2019 contract	Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable individually evaluated for impairment minimum amount	$ 100,000
Individually evaluated for impairment	$ 100,000
Payment delays limit (in days)	90 days
Impaired financing receivable commitment to lend	$ 4,000
Period to classify TDR non performing loans to performing (in months)	6 months
Number of loan modifications | contract	0	0
Number of TDRs that defaulted | contract	3
Recorded investment	$ 12,885,000		$ 13,282,000
Real estate acquired through foreclosure	393,000		493,000
Mortgage loans in process of foreclosure, amount	$ 421,000		$ 32,000
Number of categories considered not criticized and rated as, Pass | category	6
Minimum period after which loans are considered as substandard (in days)	90 days
Number of components that represents the allowance for loan losses | component	2
Number of classes that groups of loans are collectively evaluated for impairment | class	2
Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of categories in which real estate loans segmented | category	3
Jersey Shore State Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount after which external annual loan review of commercial relationships performed, minimum	$ 1,750,000
Luzerne National Bank Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Amount after which external annual loan review of commercial relationships performed, minimum	$ 1,500,000
Commercial, financial, and agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs that defaulted | contract	2
Troubled debt restructuring, default amount	$ 1,112,000
Commercial | Real Estate Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of TDRs that defaulted | contract	1
Troubled debt restructuring, default amount	$ 1,040,000
COVID-19 Modifications | Rate modification
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan modifications | contract	23
Recorded investment	$ 2,476,000
COVID-19 Modifications | Payment deferral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loan modifications | contract	36
Recorded investment	$ 4,044,000