CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Available-for-sale, amortized cost, net	$ 683,837,000	$ 729,198,000
Available-for-sale, allowance for credit loss	0	0
Securities held to maturity, estimated fair value	1,779,000	$ 2,402,000
Securities held to maturity, allowance for credit loss	$ 0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	10,000,000	10,000,000
Common stock, shares issued (in shares)	5,310,076	5,310,076
Treasury stock, at cost (in shares)	589,004	615,448