Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Financial Condition [Abstract]
Held to maturity securities, fair value	$ 10,677	$ 12,282
Available for sale securities, amortized cost	$ 427,113	$ 401,136
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,230,714	21,138,028
Treasury Stock, Shares	2,555,987	1,131,226