Long Island’s Rivkin Radler has agreed to acquire Iseman, Cunningham, Riester & Hyde, a 16-lawyer shop with two New York offices in Albany and Poughkeepsie.

The tie-up, to be announced Wednesday afternoon, comes amid signs of increased consolidation for small and mid-sized firms in the New York market. Rivkin Radler, which will keep its current name after absorbing Iseman Cunningham, will grow to about 180 lawyers as a result of the combination.