Business Combinations (Schedule of Pro Forma Information) (Details) - East River Bank (“ERB”) [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Net interest income after loan loss provision	$ 34,056	$ 32,281
Non-interest income	6,777	5,565
Non-interest expense	29,245	27,169
Net income available to common shareholders	$ 8,537	$ 7,737
Net income per common share - basic	$ 2.01	$ 1.88
Net income per common share - diluted	$ 1.98	$ 1.84