Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
ASSETS:
Held to maturity securities, fair value	$ 17,878	$ 19,680
SHAREHOLDERS' EQUITY:
Capital stock, par value (in dollars per share)	$ 1	$ 1
Capital stock, shares authorized (in shares)	150,000,000	150,000,000
Capital stock, shares issued (in shares)	100,204,832	100,204,832
Treasury stock, at cost (in shares)	3,772,175	3,283,175