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Investment Securities - Summary of Amortized Cost and Estimated Fair Value, HTM and Restricted Equity Securities (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Securities to be held to maturity      
Amortized Cost $ 369,900,000 $ 385,669,000  
Unrealized Gains 98,000 383,000  
Unrealized Losses (55,005,000) (47,482,000)  
Fair Value (Estimated) 314,993,000 338,570,000  
Less allowance for credit losses (196,000) (434,000) $ 0
Net securities to be held to maturity 369,704,000 385,235,000  
Restricted equity securities      
Federal Home Loan Bank Stock 6,166,000 2,348,000  
Federal Reserve Bank Stock 1,037,000 1,037,000  
Restricted equity securities 7,203,000 3,385,000  
U.S. Treasury & Agency securities      
Securities to be held to maturity      
Amortized Cost 38,100,000 40,100,000  
Unrealized Gains 0 0  
Unrealized Losses (9,938,000) (9,601,000)  
Fair Value (Estimated) 28,162,000 30,499,000  
Less allowance for credit losses 0    
Mortgage-backed securities      
Securities to be held to maturity      
Amortized Cost 52,370,000 56,401,000  
Unrealized Gains 15,000 70,000  
Unrealized Losses (11,360,000) (10,398,000)  
Fair Value (Estimated) 41,025,000 46,073,000  
State and political subdivisions      
Securities to be held to maturity      
Amortized Cost 252,180,000 254,418,000  
Unrealized Gains 83,000 313,000  
Unrealized Losses (31,739,000) (24,213,000)  
Fair Value (Estimated) 220,524,000 230,518,000  
Less allowance for credit losses (80,000) (212,000) 0
Corporate securities      
Securities to be held to maturity      
Amortized Cost 27,250,000 34,750,000  
Unrealized Gains 0 0  
Unrealized Losses (1,968,000) (3,270,000)  
Fair Value (Estimated) 25,282,000 31,480,000  
Less allowance for credit losses $ (116,000) $ (222,000) $ 0