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Securities - Unrealized Loss Positions (Details)
 9 Months Ended
Sep. 30, 2021
USD ($)
security
Dec. 31, 2020
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 170,116,000 $ 37,791,000
12 Months or More, Fair Value 7,065,000  
Total Fair Value 177,181,000 37,791,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 1,578,000 204,000
12 Months or More, Unrealized Loss 106,000  
Total Unrealized Loss $ 1,684,000 204,000
Other information    
Number of positions considered temporarily impaired | security 133  
Number of position significant relative to carrying value 0  
Debt securities considered temporarily impaired $ 177,181,000 37,791,000
Other than temporary impairment 0  
U.S. government agencies and corporations    
Fair value    
Less Than 12 Months, Fair Value 46,809,000 12,719,000
12 Months or More, Fair Value 1,451,000  
Total Fair Value 48,260,000 12,719,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 724,000 10,000
12 Months or More, Unrealized Loss 48,000  
Total Unrealized Loss 772,000 10,000
Other information    
Debt securities considered temporarily impaired 48,260,000 12,719,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 94,098,000 15,691,000
12 Months or More, Fair Value 4,341,000  
Total Fair Value 98,439,000 15,691,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 511,000 115,000
12 Months or More, Unrealized Loss 22,000  
Total Unrealized Loss 533,000 115,000
Other information    
Debt securities considered temporarily impaired 98,439,000 15,691,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 20,132,000 5,110,000
12 Months or More, Fair Value 1,273,000  
Total Fair Value 21,405,000 5,110,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 279,000 36,000
12 Months or More, Unrealized Loss 36,000  
Total Unrealized Loss 315,000 36,000
Other information    
Debt securities considered temporarily impaired 21,405,000 5,110,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 9,077,000 4,271,000
Total Fair Value 9,077,000 4,271,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 64,000 43,000
Total Unrealized Loss 64,000 43,000
Other information    
Debt securities considered temporarily impaired $ 9,077,000 $ 4,271,000