Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
ASSETS:
Held to maturity securities, fair value	$ 6,108	$ 6,396
SHAREHOLDERS' EQUITY:
Capital stock, par value (in dollars per share)	$ 1	$ 1
Capital stock, shares authorized (in shares)	30,000,000	30,000,000
Capital stock, shares issued (in shares)	20,058,142	20,058,142
Capital stock, shares outstanding (in shares)	19,024,433	19,024,433
Treasury stock, at cost (in shares)	1,033,709	1,033,709