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Securities - Unrealized Loss Positions (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 287,171,000 $ 198,937,000
12 Months or More, Fair Value 63,115,000 18,485,000
Total Fair Value 350,286,000 217,422,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 13,116,000 2,417,000
12 Months or More, Unrealized Loss 5,520,000 524,000
Total Unrealized Loss $ 18,636,000 2,941,000
Other information    
Number of positions considered temporarily impaired | security 390  
Number of position significant relative to carrying value 0  
Debt securities considered temporarily impaired $ 350,286,000 217,422,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
Less Than 12 Months, Fair Value 24,200,000  
Total Fair Value 24,200,000  
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 519,000  
Total Unrealized Loss 519,000  
Other information    
Debt securities considered temporarily impaired 24,200,000  
U.S. government agencies and corporations    
Fair value    
Less Than 12 Months, Fair Value 41,083,000 46,561,000
12 Months or More, Fair Value 29,078,000 10,604,000
Total Fair Value 70,161,000 57,165,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 2,599,000 945,000
12 Months or More, Unrealized Loss 3,213,000 394,000
Total Unrealized Loss 5,812,000 1,339,000
Other information    
Debt securities considered temporarily impaired 70,161,000 57,165,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 151,040,000 126,873,000
12 Months or More, Fair Value 26,199,000 5,178,000
Total Fair Value 177,239,000 132,051,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 7,102,000 1,127,000
12 Months or More, Unrealized Loss 1,737,000 74,000
Total Unrealized Loss 8,839,000 1,201,000
Other information    
Debt securities considered temporarily impaired 177,239,000 132,051,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 54,328,000 16,578,000
12 Months or More, Fair Value 6,875,000 2,703,000
Total Fair Value 61,203,000 19,281,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 2,408,000 224,000
12 Months or More, Unrealized Loss 534,000 56,000
Total Unrealized Loss 2,942,000 280,000
Other information    
Debt securities considered temporarily impaired 61,203,000 19,281,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 16,520,000 8,925,000
12 Months or More, Fair Value 963,000  
Total Fair Value 17,483,000 8,925,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 488,000 121,000
12 Months or More, Unrealized Loss 36,000  
Total Unrealized Loss 524,000 121,000
Other information    
Debt securities considered temporarily impaired $ 17,483,000 $ 8,925,000