Business Combinations (Schedule of Operating Results) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Business Acquisition [Line Items]
Net interest income	$ 11,422	$ 11,183	$ 10,546	$ 10,345	$ 10,162	$ 9,850	$ 9,793	$ 9,945	$ 43,496	$ 39,750	$ 33,929
Non-interest income									7,210	7,478	2,472
Net income	4,469	4,454	4,353	4,231	3,622	3,702	3,584	3,018	17,507	13,926	7,004
Saddle River Valley Bank [Member]
Business Acquisition [Line Items]
Net interest income									1,352
Non-interest income									15
Non-interest expense and income taxes									(763)
Net income									$ 604