Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Consolidated Balance Sheets Parenthetical [Abstract] | ||
| Debt securities, available-for-sale, cost (in dollars) | $ 538,629 | $ 450,770 |
| Equity securities, available for sale, cost (in dollars) | $ 24,951 | $ 25,360 |
| 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 | 1,775,512 | 1,655,306 |