Acquisitions And Stock Offering (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	6 Months Ended
	Jun. 21, 2017	Jun. 16, 2017	Sep. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Business Acquisition [Line Items]
Assets				$ 928,827	$ 789,812	$ 848,728
Total loans receivable				773,217		696,142
Deposits				710,487		$ 660,921
Net proceeds from issuance of common stock				0	$ 2
Common Stock [Member]
Business Acquisition [Line Items]
Net proceeds from issuance of common stock		$ 28,300
Unbilled offering expense				300
Underwritten Public Offering [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Shares issued in offering (in shares)	1,136,363
Shares issued in offering (usd per share)	$ 24.00
Over-Allotment Option [Member] | Common Stock [Member]
Business Acquisition [Line Items]
Shares issued in offering (in shares)	113,636
Community Bank of Bergen County, Merger [Member]
Business Acquisition [Line Items]
Merger expenses				$ 481
Scenario, Forecast [Member] | Community Bank of Bergen County, Merger [Member]
Business Acquisition [Line Items]
Entity shares issued per acquiree share (in shares)			0.97
Assets			$ 1,200,000
Total loans receivable			925,000
Deposits			$ 965,000