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Securities - Unrealized Loss Positions (Details)
 9 Months Ended
Sep. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 12,583,000 $ 13,573,000
12 Months or More, Fair Value 288,030,000 365,904,000
Total Fair Value 300,613,000 379,477,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 103,000 504,000
12 Months or More, Unrealized Loss 24,501,000 33,609,000
Total Unrealized Loss $ 24,604,000 34,113,000
Other information    
Number of positions | security 465  
Aggregate fair value $ 300,613,000 379,477,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
12 Months or More, Fair Value 10,684,000 45,103,000
Total Fair Value 10,684,000 45,103,000
Unrealized Loss    
12 Months or More, Unrealized Loss 293,000 780,000
Total Unrealized Loss 293,000 780,000
Other information    
Aggregate fair value 10,684,000 45,103,000
U.S. government agencies and corporations    
Fair value    
12 Months or More, Fair Value 63,669,000 87,094,000
Total Fair Value 63,669,000 87,094,000
Unrealized Loss    
12 Months or More, Unrealized Loss 6,727,000 9,313,000
Total Unrealized Loss 6,727,000 9,313,000
Other information    
Aggregate fair value 63,669,000 87,094,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 2,615,000 5,528,000
12 Months or More, Fair Value 132,043,000 150,023,000
Total Fair Value 134,658,000 155,551,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 27,000 68,000
12 Months or More, Unrealized Loss 11,394,000 16,155,000
Total Unrealized Loss 11,421,000 16,223,000
Other information    
Aggregate fair value 134,658,000 155,551,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 9,484,000 4,659,000
12 Months or More, Fair Value 62,583,000 65,630,000
Total Fair Value 72,067,000 70,289,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 60,000 72,000
12 Months or More, Unrealized Loss 3,230,000 3,972,000
Total Unrealized Loss 3,290,000 4,044,000
Other information    
Aggregate fair value 72,067,000 70,289,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 484,000 3,386,000
12 Months or More, Fair Value 19,051,000 18,054,000
Total Fair Value 19,535,000 21,440,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 16,000 364,000
12 Months or More, Unrealized Loss 2,857,000 3,389,000
Total Unrealized Loss 2,873,000 3,753,000
Other information    
Aggregate fair value $ 19,535,000 $ 21,440,000