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Investment Securities - Schedule of Amortized Cost and Estimated Fair Value, AFS, HTM and Restricted Equity Securities (Details) - USD ($)
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Securities available for sale            
Amortized Cost $ 315,926,000   $ 328,693,000 $ 328,558,000    
Unrealized Gains 421,000   155,000 499,000    
Unrealized Losses (42,854,000)   (54,168,000) (44,036,000)    
Fair Value (Estimated) 273,493,000   274,680,000 285,021,000    
Securities to be held to maturity            
Amortized Cost 362,738,000   369,900,000 377,859,000    
Unrealized Gains 253,000   98,000 370,000    
Unrealized Losses (46,417,000)   (55,005,000) (44,654,000)    
Fair Value (Estimated) 316,574,000   314,993,000 333,575,000    
Less allowance for credit losses (186,000) $ (198,000) (196,000) (224,000) $ (149,000) $ (434,000)
Net securities to be held to maturity 362,552,000   369,704,000 377,635,000    
Restricted equity securities            
Federal Home Loan Bank Stock 5,879,000   6,166,000 5,383,000    
Federal Reserve Bank Stock 1,037,000   1,037,000 1,037,000    
Restricted equity securities 6,916,000   7,203,000 6,420,000    
U.S. Treasury & Agency securities            
Securities available for sale            
Amortized Cost 23,045,000   26,042,000 26,040,000    
Unrealized Gains 0   0 0    
Unrealized Losses (5,163,000)   (6,246,000) (5,305,000)    
Fair Value (Estimated) 17,882,000   19,796,000 20,735,000    
Securities to be held to maturity            
Amortized Cost 38,100,000   38,100,000 38,100,000    
Unrealized Gains 0   0 0    
Unrealized Losses (8,381,000)   (9,938,000) (8,371,000)    
Fair Value (Estimated) 29,719,000   28,162,000 29,729,000    
Less allowance for credit losses 0          
Mortgage-backed securities            
Securities available for sale            
Amortized Cost 250,759,000   260,267,000 259,979,000    
Unrealized Gains 409,000   141,000 438,000    
Unrealized Losses (31,751,000)   (41,026,000) (33,043,000)    
Fair Value (Estimated) 219,417,000   219,382,000 227,374,000    
Securities to be held to maturity            
Amortized Cost 49,444,000   52,370,000 53,373,000    
Unrealized Gains 96,000   15,000 103,000    
Unrealized Losses (9,434,000)   (11,360,000) (9,378,000)    
Fair Value (Estimated) 40,106,000   41,025,000 44,098,000    
State and political subdivisions            
Securities available for sale            
Amortized Cost 40,071,000   40,148,000 40,254,000    
Unrealized Gains 0   0 42,000    
Unrealized Losses (5,909,000)   (6,896,000) (5,688,000)    
Fair Value (Estimated) 34,162,000   33,252,000 34,608,000    
Securities to be held to maturity            
Amortized Cost 249,194,000   252,180,000 252,636,000    
Unrealized Gains 103,000   83,000 267,000    
Unrealized Losses (27,445,000)   (31,739,000) (24,669,000)    
Fair Value (Estimated) 221,852,000   220,524,000 228,234,000    
Less allowance for credit losses (77,000) (79,000) (80,000) (86,000) (56,000) (212,000)
Asset-backed securities            
Securities available for sale            
Amortized Cost 2,051,000   2,236,000 2,285,000    
Unrealized Gains 12,000   14,000 19,000    
Unrealized Losses (31,000)   0 0    
Fair Value (Estimated) 2,032,000   2,250,000 2,304,000    
Corporate securities            
Securities to be held to maturity            
Amortized Cost 26,000,000   27,250,000 33,750,000    
Unrealized Gains 54,000   0 0    
Unrealized Losses (1,157,000)   (1,968,000) (2,236,000)    
Fair Value (Estimated) 24,897,000   25,282,000 31,514,000    
Less allowance for credit losses $ (109,000) $ (119,000) $ (116,000) $ (138,000) $ (93,000) $ (222,000)