Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Held-to-maturity securities, at amortized cost ,fair value	$ 914	$ 1,722
Loans receivable, allowance for loan losses	$ 16,352	$ 14,870
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	50,000,000	50,000,000
Common stock, shares, issued	18,463,028	18,463,028
Common stock, shares, outstanding	17,425,987	17,125,969
Treasury stock,repurchased	1,037,041	1,337,059
Unearned Employee Stock Ownership Plan (ESOP) shares	434,251	530,751