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CONDENSED CONSOLIDATED STATEMENTS OF CONDITION (Parenthetical) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Statement of Financial Position [Abstract]    
Available-for-sale securities, at amortized cost $ 1,385,805,000 $ 1,408,996,000
Held-to-maturity securities, at fair value 137,221,000 140,315,000
Equity Securities, at amortized cost $ 1,000,000 $ 1,000,000
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) 15,314,340 15,301,524
Treasury stock, shares (in shares) 118,554 120,805