Other Noninterest Income and Expense - Summary of Noninterest Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	$ 4,039	$ 3,770
Customer bank card processing
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	516	543
Telephone and data communications
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	465	417
Subscriptions
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	422	318
Printing and supplies
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	362	299
Internet banking and bill pay
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	346	362
Travel, entertainment and conferences
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	330	325
Pennsylvania shares and use taxes
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	292	295
Marketing and advertising
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	291	244
Correspondent bank and courier fees
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	265	225
Charitable contributions
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	180	180
Regulatory examinations
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	177	159
Postage and freight
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	131	87
Memberships and dues
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	94	68
Penalty on prepayment of FHLB advance
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	71	0
Other
Other Noninterest Income And Expense [Line Items]
Total other noninterest expenses	$ 97	$ 248