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Securities - Unrealized Loss Positions (Details)
 3 Months Ended
Mar. 31, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 138,296,000 $ 271,692,000
12 Months or More, Fair Value 329,993,000 209,967,000
Total Fair Value 468,289,000 481,659,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 2,764,000 12,523,000
12 Months or More, Unrealized Loss 35,979,000 32,379,000
Total Unrealized Loss $ 38,743,000 44,902,000
Other information    
Number of positions | security 538  
Aggregate fair value $ 468,289,000 481,659,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
Less Than 12 Months, Fair Value 29,234,000 50,556,000
12 Months or More, Fair Value 27,721,000 8,277,000
Total Fair Value 56,955,000 58,833,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 478,000 1,368,000
12 Months or More, Unrealized Loss 1,113,000 685,000
Total Unrealized Loss 1,591,000 2,053,000
Other information    
Aggregate fair value 56,955,000 58,833,000
U.S. government agencies and corporations    
Fair value    
Less Than 12 Months, Fair Value 57,986,000 71,948,000
12 Months or More, Fair Value 68,110,000 58,326,000
Total Fair Value 126,096,000 130,274,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 750,000 1,578,000
12 Months or More, Unrealized Loss 10,031,000 11,389,000
Total Unrealized Loss 10,781,000 12,967,000
Other information    
Aggregate fair value 126,096,000 130,274,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 22,434,000 73,301,000
12 Months or More, Fair Value 156,393,000 104,563,000
Total Fair Value 178,827,000 177,864,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 615,000 5,441,000
12 Months or More, Unrealized Loss 17,255,000 15,099,000
Total Unrealized Loss 17,870,000 20,540,000
Other information    
Aggregate fair value 178,827,000 177,864,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 23,694,000 60,838,000
12 Months or More, Fair Value 61,672,000 32,120,000
Total Fair Value 85,366,000 92,958,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 344,000 2,434,000
12 Months or More, Unrealized Loss 4,945,000 4,356,000
Total Unrealized Loss 5,289,000 6,790,000
Other information    
Aggregate fair value 85,366,000 92,958,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 4,948,000 15,049,000
12 Months or More, Fair Value 16,097,000 6,681,000
Total Fair Value 21,045,000 21,730,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 577,000 1,702,000
12 Months or More, Unrealized Loss 2,635,000 850,000
Total Unrealized Loss 3,212,000 2,552,000
Other information    
Aggregate fair value $ 21,045,000 $ 21,730,000