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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 4,360 $ 392
Less than 12 Months, Unrealized Losses (111) (3)
12 Months or More, Fair Value 490,133 595,686
12 Months or More, Unrealized Losses (49,961) (72,460)
Total Fair Value 494,493 596,078
Total Unrealized Losses (50,072) (72,463)
U.S. Treasury securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 9,256 8,954
12 Months or More, Unrealized Losses (737) (1,036)
Total Fair Value 9,256 8,954
Total Unrealized Losses (737) (1,036)
U.S. Government agencies    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 68 95
12 Months or More, Unrealized Losses (3) (7)
Total Fair Value 68 95
Total Unrealized Losses (3) (7)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 1,901 0
Less than 12 Months, Unrealized Losses (109) 0
12 Months or More, Fair Value 167,221 180,222
12 Months or More, Unrealized Losses (15,265) (17,848)
Total Fair Value 169,122 180,222
Total Unrealized Losses (15,374) (17,848)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 2,459 392
Less than 12 Months, Unrealized Losses (2) (3)
12 Months or More, Fair Value 68,551 82,760
12 Months or More, Unrealized Losses (3,612) (5,522)
Total Fair Value 71,010 83,152
Total Unrealized Losses (3,614) (5,525)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Losses 0 0
12 Months or More, Fair Value 245,037 323,655
12 Months or More, Unrealized Losses (30,344) (48,047)
Total Fair Value 245,037 323,655
Total Unrealized Losses $ (30,344) $ (48,047)