Loans - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) category component class contract	Mar. 31, 2016 USD ($) contract	Sep. 30, 2016 USD ($) category component class	Sep. 30, 2015 USD ($) contract	Sep. 30, 2016 USD ($) category component class contract	Dec. 31, 2015 USD ($)	Jun. 01, 2013 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable, unpaid principal balance	$ 17,202,000		$ 17,202,000		$ 17,202,000	$ 16,063,000
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	$ 24,000		$ 24,000		$ 24,000
Reasonable period to classify from troubled debt restructuring non performing loans to performing loans (in months)			6 months
Number of contracts | contract	2				5
Recorded investment	$ 9,219,000		$ 9,219,000		$ 9,219,000	9,647,000
Number of categories considered not criticized and rated as, Pass | category	6		6		6
Minimum period after which loans are considered as substandard (in days)			90 days
The total number of components that represents the allowance for loan losses | component	2		2		2
The number of classes that groups of loans are collectively evaluated for impairment | class	2		2		2
Period considered for quarter moving average which used in calculating historical charge off (in months)			36 months
Luzerne National Bank Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair value							$ 878,000
Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, net	$ 329,000		$ 329,000		$ 329,000	341,000
Financing receivable, allowance for credit losses	0		0		0
Purchased loans | Luzerne National Bank Corporation
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable, unpaid principal balance							1,211,000
Contractually required payments							1,783,000
Cash flows expected to be collected							941,000
Certain loans acquired in transfer not accounted for as debt securities non accretable yield							842,000
Accretable yield							$ 63,000
Purchased loans | Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, net	329,000		329,000		329,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract		1		1
Recorded investment		$ 239,000		$ 48,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract		3
Recorded investment		$ 173,000
Commercial Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of contracts | contract		1
Recorded investment		$ 103,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Real estate acquired through foreclosure	0		0		0	102,000
Mortgage loans in process of foreclosure, amount	872,000		$ 872,000		872,000	448,000
Real estate mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of categories in which real estate loans segmented | category			3
Real estate mortgage | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable, unpaid principal balance	12,384,000		$ 12,384,000		12,384,000	12,537,000
Real estate mortgage | Commercial | Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, net	0		0		0	0
Real estate mortgage | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable, unpaid principal balance	4,555,000		4,555,000		4,555,000	2,845,000
Real estate mortgage | Residential | Receivables Acquired with Deteriorated Credit Quality
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, net	$ 329,000		$ 329,000		$ 329,000	$ 341,000