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Subsequent Event (Details) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Subsequent Event [Line Items]        
Assets   $ 872,282 $ 848,728 $ 716,772
Total loans receivable   719,690 696,142  
Deposits   $ 696,576 $ 660,921  
Scenario, Forecast [Member] | Community Bank of Bergen County, Merger [Member]        
Subsequent Event [Line Items]        
Entity shares issued per acquiree share (in shares) 0.97      
Assets $ 1,200,000      
Total loans receivable 925,000      
Deposits $ 965,000