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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value, AFS, HTM and Restricted Equity Securities (Details) - USD ($)
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Securities available for sale        
Amortized Cost $ 329,753,000 $ 328,693,000 $ 328,648,000  
Unrealized Gains 394,000 155,000 119,000  
Unrealized Losses (49,383,000) (54,168,000) (54,316,000)  
Fair Value (Estimated) 280,764,000 274,680,000 274,451,000  
Securities to be held to maturity        
Amortized Cost 368,768,000 369,900,000 379,635,000  
Unrealized Gains 90,000 98,000 190,000  
Unrealized Losses (56,070,000) (55,005,000) (52,009,000)  
Fair Value (Estimated) 312,788,000 314,993,000 327,816,000  
Less allowance for credit losses (197,000) (196,000) (182,000) $ (434,000)
Net securities to be held to maturity 368,571,000 369,704,000 379,453,000  
Restricted equity securities        
Federal Home Loan Bank Stock 6,472,000 6,166,000 4,896,000  
Federal Reserve Bank Stock 1,037,000 1,037,000 1,037,000  
Restricted equity securities 7,509,000 7,203,000 5,933,000  
U.S. Treasury & Agency securities        
Securities available for sale        
Amortized Cost 24,543,000 26,042,000 26,036,000  
Unrealized Gains 0 0 0  
Unrealized Losses (5,593,000) (6,246,000) (6,343,000)  
Fair Value (Estimated) 18,950,000 19,796,000 19,693,000  
Securities to be held to maturity        
Amortized Cost 38,100,000 38,100,000 38,100,000  
Unrealized Gains 0 0 0  
Unrealized Losses (8,904,000) (9,938,000) (9,851,000)  
Fair Value (Estimated) 29,196,000 28,162,000 28,249,000  
Less allowance for credit losses 0      
Mortgage-backed securities        
Securities available for sale        
Amortized Cost 262,912,000 260,267,000 259,538,000  
Unrealized Gains 381,000 141,000 99,000  
Unrealized Losses (36,416,000) (41,026,000) (41,635,000)  
Fair Value (Estimated) 226,877,000 219,382,000 218,002,000  
Securities to be held to maturity        
Amortized Cost 51,600,000 52,370,000 55,483,000  
Unrealized Gains 52,000 15,000 15,000  
Unrealized Losses (10,402,000) (11,360,000) (11,258,000)  
Fair Value (Estimated) 41,250,000 41,025,000 44,240,000  
State and political subdivisions        
Securities available for sale        
Amortized Cost 40,130,000 40,148,000 40,288,000  
Unrealized Gains 0 0 0  
Unrealized Losses (7,368,000) (6,896,000) (6,338,000)  
Fair Value (Estimated) 32,762,000 33,252,000 33,950,000  
Securities to be held to maturity        
Amortized Cost 251,818,000 252,180,000 254,302,000  
Unrealized Gains 38,000 83,000 175,000  
Unrealized Losses (34,924,000) (31,739,000) (27,879,000)  
Fair Value (Estimated) 216,932,000 220,524,000 226,598,000  
Less allowance for credit losses (81,000) (80,000) (69,000) (212,000)
Asset-backed securities        
Securities available for sale        
Amortized Cost 2,168,000 2,236,000 2,786,000  
Unrealized Gains 13,000 14,000 20,000  
Unrealized Losses (6,000) 0 0  
Fair Value (Estimated) 2,175,000 2,250,000 2,806,000  
Corporate securities        
Securities to be held to maturity        
Amortized Cost 27,250,000 27,250,000 31,750,000  
Unrealized Gains 0 0 0  
Unrealized Losses (1,840,000) (1,968,000) (3,021,000)  
Fair Value (Estimated) 25,410,000 25,282,000 28,729,000  
Less allowance for credit losses $ (116,000) $ (116,000) $ (113,000) $ (222,000)