Loans Receivable, Credit Quality for Loans and the Allowance for Loan Losses - Summary of Changes in Accretable Discount Related to Purchased Credit Impaired Loans (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Union Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance - beginning of period	$ 259	$ 300	$ 307	$ 310
Accretion recognized during the period	(21)	(30)	(115)	(56)
Net reclassification from non-accretable to accretable	13	56	59	72
Balance - end of period	251	$ 326	251	$ 326
Citizens National Bank of Meyersdale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance - beginning of period	213		217
Accretion recognized during the period	(8)		(14)
Net reclassification from non-accretable to accretable	1		3
Balance - end of period	$ 206		$ 206