Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Consolidated Balance Sheets [Abstract]
Debt securities, available-for-sale, cost (in dollars)	$ 597,890	$ 538,629
Equity securities, available for sale, cost (in dollars)	30,309	24,951
Subordinated debt securities, unamortized debt issuance cost (in dollars)	$ 1,014	$ 1,053
Common stock, par value (in dollars per share)	$ 0.18	$ 0.18
Common stock, authorized shares	33,333,333	33,333,333
Common stock, issued shares	20,872,831	20,872,831
Treasury stock, shares	2,229,441	1,775,512