Consolidated Statements Of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Consolidated Statements Of Financial Condition [Abstract]
Held to maturity securities, fair value	$ 12,248	$ 12,282
Available for sale securities, amortized cost	$ 409,093	$ 401,136
Common stock, par value	$ 1	$ 1
Common stock, shares authorized	40,000,000	40,000,000
Common stock, shares issued	21,225,034	21,138,028
Treasury Stock, Shares	1,939,989	1,131,226