Available-for-sale and held-to-maturity investment securities at December 31, 2023 and 2022 are summarized as follows: (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	$ 166,281	$ 179,156
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(29,166)	(32,159)
Available-for-sale securities, at fair value	137,115	146,997
Held-to-maturity securities, amortized cost	223,370	230,168
Held-to-maturity securities, gross unrealized gains	107	67
Held-to-maturity securities, gross unrealized losses	(35,785)	(39,285)
Held-to-maturity securities, fair value	187,692	190,950
Total, amortized cost	389,651	409,324
Total, gross unrealized gains	107	67
Total, gross unrealized losses	(64,951)	(71,444)
Total, fair value	324,807	337,947
Government-sponsored enterprise obligations [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	14,924	14,913
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(2,898)	(3,345)
Available-for-sale securities, at fair value	12,026	11,568
State and Municipal Bonds [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	135	270
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses
Available-for-sale securities, at fair value	135	270
Corporate Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	8,000	8,012
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(1,038)	(519)
Available-for-sale securities, at fair value	6,962	7,493
Debt Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	23,059	23,195
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(3,936)	(3,864)
Available-for-sale securities, at fair value	19,123	19,331
Held-to-maturity securities, amortized cost	9,995	9,987
Held-to-maturity securities, gross unrealized gains
Held-to-maturity securities, gross unrealized losses	(545)	(825)
Held-to-maturity securities, fair value	9,450	9,162
Government-sponsored mortgage-backed securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	136,533	148,544
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(23,976)	(26,826)
Available-for-sale securities, at fair value	112,557	121,718
Held-to-maturity securities, amortized cost	213,375	220,181
Held-to-maturity securities, gross unrealized gains	107	67
Held-to-maturity securities, gross unrealized losses	(35,240)	(38,460)
Held-to-maturity securities, fair value	178,242	181,788
U.S. government guaranteed mortgage-backed securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	6,689	7,417
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(1,254)	(1,469)
Available-for-sale securities, at fair value	5,435	5,948
Collateralized Mortgage-Backed Securities [Member]
Marketable Securities [Line Items]
Available-for-sale securities, amortized cost	143,222	155,961
Available-for-sale securities, gross unrealized gains
Available-for-sale securities, gross unrealized losses	(25,230)	(28,295)
Available-for-sale securities, at fair value	117,992	127,666
Held-to-maturity securities, amortized cost	213,375	220,181
Held-to-maturity securities, gross unrealized gains	107	67
Held-to-maturity securities, gross unrealized losses	(35,240)	(38,460)
Held-to-maturity securities, fair value	178,242	181,788
US Treasury Securities [Member]
Marketable Securities [Line Items]
Held-to-maturity securities, amortized cost	9,995	9,987
Held-to-maturity securities, gross unrealized gains
Held-to-maturity securities, gross unrealized losses	(545)	(825)
Held-to-maturity securities, fair value	$ 9,450	$ 9,162