Acquisition - Summary of Acquired Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jul. 01, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Interest component of expected cash flows (accretable discount)	$ 50		$ 144	$ 0
Fox Chase Bank [Member]
Business Acquisition [Line Items]
Contractually required principal and interest payments		$ 25,141
Contractual cash flows not expected to be collected (nonaccretable difference)		(11,120)
Cash flows expected to be collected		14,021
Interest component of expected cash flows (accretable discount)		(283)
Fair value of loans acquired with a deterioration of credit quality		$ 13,738