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Securities - Unrealized Loss Positions (Details)
 6 Months Ended
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Fair value    
Less Than 12 Months, Fair Value $ 60,219,000 $ 271,692,000
12 Months or More, Fair Value 396,829,000 209,967,000
Total Fair Value 457,048,000 481,659,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 1,149,000 12,523,000
12 Months or More, Unrealized Loss 41,916,000 32,379,000
Total Unrealized Loss $ 43,065,000 44,902,000
Other information    
Number of positions | security 574  
Aggregate fair value $ 457,048,000 481,659,000
Other than temporary impairment 0  
U.S. Treasury securities    
Fair value    
Less Than 12 Months, Fair Value   50,556,000
12 Months or More, Fair Value 52,018,000 8,277,000
Total Fair Value 52,018,000 58,833,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss   1,368,000
12 Months or More, Unrealized Loss 1,652,000 685,000
Total Unrealized Loss 1,652,000 2,053,000
Other information    
Aggregate fair value 52,018,000 58,833,000
U.S. government agencies and corporations    
Fair value    
Less Than 12 Months, Fair Value 7,367,000 71,948,000
12 Months or More, Fair Value 106,891,000 58,326,000
Total Fair Value 114,258,000 130,274,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 2,000 1,578,000
12 Months or More, Unrealized Loss 11,529,000 11,389,000
Total Unrealized Loss 11,531,000 12,967,000
Other information    
Aggregate fair value 114,258,000 130,274,000
Mortgage-backed securities    
Fair value    
Less Than 12 Months, Fair Value 13,295,000 73,301,000
12 Months or More, Fair Value 155,560,000 104,563,000
Total Fair Value 168,855,000 177,864,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 452,000 5,441,000
12 Months or More, Unrealized Loss 19,093,000 15,099,000
Total Unrealized Loss 19,545,000 20,540,000
Other information    
Aggregate fair value 168,855,000 177,864,000
Obligations of states and political subdivisions    
Fair value    
Less Than 12 Months, Fair Value 37,749,000 60,838,000
12 Months or More, Fair Value 63,862,000 32,120,000
Total Fair Value 101,611,000 92,958,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 483,000 2,434,000
12 Months or More, Unrealized Loss 5,928,000 4,356,000
Total Unrealized Loss 6,411,000 6,790,000
Other information    
Aggregate fair value 101,611,000 92,958,000
Corporate and other debt securities    
Fair value    
Less Than 12 Months, Fair Value 1,808,000 15,049,000
12 Months or More, Fair Value 18,498,000 6,681,000
Total Fair Value 20,306,000 21,730,000
Unrealized Loss    
Less Than 12 Months, Unrealized Loss 212,000 1,702,000
12 Months or More, Unrealized Loss 3,714,000 850,000
Total Unrealized Loss 3,926,000 2,552,000
Other information    
Aggregate fair value $ 20,306,000 $ 21,730,000