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Securities - Unrealized Loss Positions (Details)
 9 Months Ended
Sep. 30, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 330,820,000 $ 198,937,000
12 Months or More, Fair Value 154,396,000 18,485,000
Total Fair Value 485,216,000 217,422,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 23,200,000 2,417,000
12 Months or More, Unrealized Loss 27,165,000 524,000
Total Unrealized Loss $ 50,365,000 2,941,000
Other information    
Number of positions considered temporarily impaired | security 567  
Debt securities considered temporarily impaired $ 485,216,000 217,422,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
Less Than 12 Months, Fair Value 58,590,000  
Total Fair Value 58,590,000  
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 2,137,000  
Total Unrealized Loss 2,137,000  
Other information    
Debt securities considered temporarily impaired 58,590,000  
U.S. government agencies and corporations    
Fair value    
Less Than 12 Months, Fair Value 85,022,000 46,561,000
12 Months or More, Fair Value 45,188,000 10,604,000
Total Fair Value 130,210,000 57,165,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 3,345,000 945,000
12 Months or More, Unrealized Loss 9,540,000 394,000
Total Unrealized Loss 12,885,000 1,339,000
Other information    
Debt securities considered temporarily impaired 130,210,000 57,165,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 91,082,000 126,873,000
12 Months or More, Fair Value 90,052,000 5,178,000
Total Fair Value 181,134,000 132,051,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 9,283,000 1,127,000
12 Months or More, Unrealized Loss 14,569,000 74,000
Total Unrealized Loss 23,852,000 1,201,000
Other information    
Debt securities considered temporarily impaired 181,134,000 132,051,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 79,337,000 16,578,000
12 Months or More, Fair Value 14,189,000 2,703,000
Total Fair Value 93,526,000 19,281,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 6,456,000 224,000
12 Months or More, Unrealized Loss 2,482,000 56,000
Total Unrealized Loss 8,938,000 280,000
Other information    
Debt securities considered temporarily impaired 93,526,000 19,281,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 16,789,000 8,925,000
12 Months or More, Fair Value 4,967,000  
Total Fair Value 21,756,000 8,925,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 1,979,000 121,000
12 Months or More, Unrealized Loss 574,000  
Total Unrealized Loss 2,553,000 121,000
Other information    
Debt securities considered temporarily impaired $ 21,756,000 $ 8,925,000