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Investment Securities - Cost basis and fair values of investment securities (Details) - USD ($)
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Information concerning investments with unrealized gains and losses      
Investment securities available for sale, Cost Basis $ 183,254,000 $ 184,018,000  
Investment securities available for sale, Gross Unrealized Gains 159,000 226,000  
Investment securities available for sale, Gross Unrealized Losses (17,845,000) (17,607,000)  
Investment securities available for sale, Allowance for credit losses (116,000) (926,000) $ (926,000)
Available for Sale, Fair Value 165,452,000 165,711,000  
Investment securities held to maturity, Cost Basis 64,967,000 63,979,000  
Investment securities held to maturity, Gross Unrealized Gains 24,000 49,000  
Investment securities held to maturity, Gross Unrealized Losses (5,811,000) (5,407,000)  
Investment securities held to maturity, Fair value 59,180,000 58,621,000  
Investment securities held to maturity, Allowance for credit losses (90,000) (37,000) (83,000)
U.S. Agency      
Information concerning investments with unrealized gains and losses      
Investment securities available for sale, Cost Basis 6,001,000 6,035,000  
Investment securities available for sale, Gross Unrealized Losses (735,000) (696,000)  
Available for Sale, Fair Value 5,266,000 5,339,000  
Investment securities held to maturity, Cost Basis 2,500,000 2,500,000  
Investment securities held to maturity, Gross Unrealized Losses (391,000) (379,000)  
Investment securities held to maturity, Fair value 2,109,000 2,121,000  
Investment securities held to maturity, Allowance for credit losses 0    
U.S. Agency mortgage-backed securities      
Information concerning investments with unrealized gains and losses      
Investment securities available for sale, Cost Basis 105,820,000 104,820,000  
Investment securities available for sale, Gross Unrealized Gains 101,000 179,000  
Investment securities available for sale, Gross Unrealized Losses (12,827,000) (11,924,000)  
Available for Sale, Fair Value 93,094,000 93,075,000  
Investment securities held to maturity, Cost Basis 25,273,000 24,222,000  
Investment securities held to maturity, Gross Unrealized Gains 24,000 49,000  
Investment securities held to maturity, Gross Unrealized Losses (2,355,000) (2,058,000)  
Investment securities held to maturity, Fair value 22,942,000 22,213,000  
Investment securities held to maturity, Allowance for credit losses 0    
Municipal      
Information concerning investments with unrealized gains and losses      
Investment securities available for sale, Cost Basis 10,840,000 11,159,000  
Investment securities available for sale, Gross Unrealized Gains 1,000 1,000  
Investment securities available for sale, Gross Unrealized Losses (813,000) (800,000)  
Available for Sale, Fair Value 10,028,000 10,360,000  
Investment securities held to maturity, Cost Basis 32,779,000 32,787,000  
Investment securities held to maturity, Gross Unrealized Losses (2,909,000) (2,797,000)  
Investment securities held to maturity, Fair value 29,870,000 29,990,000  
Investment securities held to maturity, Allowance for credit losses (2,000) (2,000) (3,000)
Corporate bonds      
Information concerning investments with unrealized gains and losses      
Investment securities available for sale, Cost Basis 60,593,000 62,004,000  
Investment securities available for sale, Gross Unrealized Gains 57,000 46,000  
Investment securities available for sale, Gross Unrealized Losses (3,470,000) (4,187,000)  
Investment securities available for sale, Allowance for credit losses (116,000) (926,000) (926,000)
Available for Sale, Fair Value 57,064,000 56,937,000  
Corporate bonds and other securities      
Information concerning investments with unrealized gains and losses      
Investment securities held to maturity, Cost Basis 4,415,000 4,470,000  
Investment securities held to maturity, Gross Unrealized Losses (156,000) (173,000)  
Investment securities held to maturity, Fair value 4,259,000 4,297,000  
Investment securities held to maturity, Allowance for credit losses $ (88,000) $ (35,000) $ (80,000)