Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities available for sale, amortized cost	$ 288,881	$ 334,846
Securities held to maturity, fair value	$ 81,088	$ 85,749
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	7,202,556	7,184,922
Common stock, shares outstanding	6,916,443	6,887,856
Treasury stock, shares	549,981	585,866
Deferred Compensation Arrangements
Common stock, shares outstanding	263,868	288,800
Preferred Class A non-voting
Preferred stock, shares authorized	200,000	200,000
Preferred stock, shares outstanding	0	0
Preferred Class B voting
Preferred stock, shares authorized	1,500,000	1,500,000
Preferred stock, shares outstanding	0	0