CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($) $ in Thousands |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Available-for-sale securities, at amortized cost | $ 1,409,996 | $ 1,442,724 |
| Fair Value | $ 140,315 | $ 142,832 |
| Common Stock, par value (in dollars per share) | $ 0.10 | $ 0.10 |
| Common Stock, authorized (in shares) | 25,000,000 | 25,000,000 |
| Common Stock, issued (in shares) | 15,301,524 | 15,171,816 |
| Treasury stock, shares (in shares) | 120,805 | 117,997 |