Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Consolidated Statements Of Financial Condition [Abstract]
Held to maturity securities, fair value	$ 10,632	$ 10,677
Available for sale securities, amortized cost	$ 424,172	$ 427,113
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,260,352	21,230,714
Treasury Stock, Shares	2,574,079	2,555,987