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Securities - Unrealized Loss Positions (Details)
 6 Months Ended
Jun. 30, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 29,731,000 $ 13,573,000
12 Months or More, Fair Value 301,852,000 365,904,000
Total Fair Value 331,583,000 379,477,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 592,000 504,000
12 Months or More, Unrealized Loss 33,075,000 33,609,000
Total Unrealized Loss $ 33,667,000 34,113,000
Other information    
Number of positions | security 513  
Aggregate fair value $ 331,583,000 379,477,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
12 Months or More, Fair Value 10,469,000 45,103,000
Total Fair Value 10,469,000 45,103,000
Unrealized Loss    
12 Months or More, Unrealized Loss 501,000 780,000
Total Unrealized Loss 501,000 780,000
Other information    
Aggregate fair value 10,469,000 45,103,000
U.S. government agencies and corporations    
Fair value    
12 Months or More, Fair Value 68,124,000 87,094,000
Total Fair Value 68,124,000 87,094,000
Unrealized Loss    
12 Months or More, Unrealized Loss 8,938,000 9,313,000
Total Unrealized Loss 8,938,000 9,313,000
Other information    
Aggregate fair value 68,124,000 87,094,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 4,700,000 5,528,000
12 Months or More, Fair Value 140,346,000 150,023,000
Total Fair Value 145,046,000 155,551,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 80,000 68,000
12 Months or More, Unrealized Loss 16,066,000 16,155,000
Total Unrealized Loss 16,146,000 16,223,000
Other information    
Aggregate fair value 145,046,000 155,551,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 22,328,000 4,659,000
12 Months or More, Fair Value 64,748,000 65,630,000
Total Fair Value 87,076,000 70,289,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 215,000 72,000
12 Months or More, Unrealized Loss 4,570,000 3,972,000
Total Unrealized Loss 4,785,000 4,044,000
Other information    
Aggregate fair value 87,076,000 70,289,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 2,703,000 3,386,000
12 Months or More, Fair Value 18,165,000 18,054,000
Total Fair Value 20,868,000 21,440,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 297,000 364,000
12 Months or More, Unrealized Loss 3,000,000 3,389,000
Total Unrealized Loss 3,297,000 3,753,000
Other information    
Aggregate fair value $ 20,868,000 $ 21,440,000