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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 1,231 $ 392
Less than 12 Months, Unrealized Losses (15) (3)
12 Months or More, Fair Value 572,051 595,686
12 Months or More, Unrealized Losses (69,987) (72,460)
Total Fair Value 573,282 596,078
Total Unrealized Losses (70,002) (72,463)
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 92 95
12 Months or More, Unrealized Losses (8) (7)
Total Fair Value 92 95
Total Unrealized Losses (8) (7)
Obligations of states and political subdivisions    
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 178,405 180,222
12 Months or More, Unrealized Losses (18,906) (17,848)
Total Fair Value 178,405 180,222
Total Unrealized Losses (18,906) (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 375 392
Less than 12 Months, Unrealized Losses (7) (3)
12 Months or More, Fair Value 80,225 82,760
12 Months or More, Unrealized Losses (5,404) (5,522)
Total Fair Value 80,600 83,152
Total Unrealized Losses (5,411) (5,525)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 856 0
Less than 12 Months, Unrealized Losses (8) 0
12 Months or More, Fair Value 304,451 323,655
12 Months or More, Unrealized Losses (44,557) (48,047)
Total Fair Value 305,307 323,655
Total Unrealized Losses (44,565) (48,047)
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 8,878 8,954
12 Months or More, Unrealized Losses (1,112) (1,036)
Total Fair Value 8,878 8,954
Total Unrealized Losses $ (1,112) $ (1,036)