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Securities - Unrealized Loss Positions (Details)
 3 Months Ended
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 23,579,000 $ 13,573,000
12 Months or More, Fair Value 334,010,000 365,904,000
Total Fair Value 357,589,000 379,477,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 630,000 504,000
12 Months or More, Unrealized Loss 35,325,000 33,609,000
Total Unrealized Loss $ 35,955,000 34,113,000
Other information    
Number of positions | security 513  
Aggregate fair value $ 357,589,000 379,477,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
12 Months or More, Fair Value 28,306,000 45,103,000
Total Fair Value 28,306,000 45,103,000
Unrealized Loss    
12 Months or More, Unrealized Loss 638,000 780,000
Total Unrealized Loss 638,000 780,000
Other information    
Aggregate fair value 28,306,000 45,103,000
U.S. government agencies and corporations    
Fair value    
12 Months or More, Fair Value 74,718,000 87,094,000
Total Fair Value 74,718,000 87,094,000
Unrealized Loss    
12 Months or More, Unrealized Loss 9,662,000 9,313,000
Total Unrealized Loss 9,662,000 9,313,000
Other information    
Aggregate fair value 74,718,000 87,094,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 6,491,000 5,528,000
12 Months or More, Fair Value 147,290,000 150,023,000
Total Fair Value 153,781,000 155,551,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 119,000 68,000
12 Months or More, Unrealized Loss 17,431,000 16,155,000
Total Unrealized Loss 17,550,000 16,223,000
Other information    
Aggregate fair value 153,781,000 155,551,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 14,416,000 4,659,000
12 Months or More, Fair Value 64,810,000 65,630,000
Total Fair Value 79,226,000 70,289,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 183,000 72,000
12 Months or More, Unrealized Loss 4,303,000 3,972,000
Total Unrealized Loss 4,486,000 4,044,000
Other information    
Aggregate fair value 79,226,000 70,289,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 2,672,000 3,386,000
12 Months or More, Fair Value 18,886,000 18,054,000
Total Fair Value 21,558,000 21,440,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 328,000 364,000
12 Months or More, Unrealized Loss 3,291,000 3,389,000
Total Unrealized Loss 3,619,000 3,753,000
Other information    
Aggregate fair value $ 21,558,000 $ 21,440,000