Loans and Leases - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable Net of Deferred Income, Acquired	$ 413,588	$ 538,780
Carrying amount	900	1,583
Nonaccrual Loans and Leases	27,559	14,517
Other accruing impaired loans	1,900	4,100
Specific reserves for other accruing impaired loans	0	99
Impaired loans with no related reserve, Recorded Investment	15,313	27,454
Impaired Financing Receivable, Related Reserve	$ 1,048	131
Maximum modification period on short-term basis	1 year
Restructured loan past due period	90 days
Lease Financings [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable Net of Deferred Income, Acquired	$ 0	0
Nonaccrual Loans and Leases	1,542	1,599
Impaired loans with no related reserve, Recorded Investment	1,300	1,300
Impaired Financing Receivable, Related Reserve	0	$ 0
Fox Chase Bank [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable Net of Deferred Income, Acquired	339,300
Carrying amount	246
Valley Green Bank [Member]
Financing Receivable, Recorded Investment [Line Items]
Loans and Leases Receivable Net of Deferred Income, Acquired	74,300
Carrying amount	654
Minimum [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount of Loan Relationship Balance, Loans Reviewed Annually	1,000
Amount of Loan Relationship Balance, Reviewed Quarterly	15,000
Maximum [Member]
Financing Receivable, Recorded Investment [Line Items]
Amount of Loan Relationship Balance, Loans Reviewed on a Performance Basis	$ 1,000