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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 4,213 $ 237,917
Less than 12 Months, Unrealized Losses (574) (27,795)
12 Months or More, Fair Value 615,354 410,654
12 Months or More, Unrealized Losses (84,672) (63,866)
Total Fair Value 619,567 648,571
Total Unrealized Losses (85,246) (91,661)
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 96 98
12 Months or More, Unrealized Losses (9) (9)
Total Fair Value 96 98
Total Unrealized Losses (9) (9)
Obligations of states and political subdivisions    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 0 90,808
Less than 12 Months, Unrealized Losses 0 (12,208)
12 Months or More, Fair Value 177,426 84,177
12 Months or More, Unrealized Losses (22,392) (14,445)
Total Fair Value 177,426 174,985
Total Unrealized Losses (22,392) (26,653)
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 860 20,825
Less than 12 Months, Unrealized Losses (21) (1,058)
12 Months or More, Fair Value 88,218 88,520
12 Months or More, Unrealized Losses (6,836) (6,745)
Total Fair Value 89,078 109,345
Total Unrealized Losses (6,857) (7,803)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 3,353 126,284
Less than 12 Months, Unrealized Losses (553) (14,529)
12 Months or More, Fair Value 340,834 229,152
12 Months or More, Unrealized Losses (54,226) (41,384)
Total Fair Value 344,187 355,436
Total Unrealized Losses (54,779) (55,913)
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 8,780 8,707
12 Months or More, Unrealized Losses (1,209) (1,283)
Total Fair Value 8,780 8,707
Total Unrealized Losses $ (1,209) $ (1,283)