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Earnings Per Common Share - Additional Information (Detail)	3 Months Ended	0 Months Ended
	Mar. 31, 2014	Feb. 10, 2015
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded from computation of diluted earnings per share	33,000
ESB Financial Corporation [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Common shares issued		9,178,531

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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