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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 590 $ 237,917
Less than 12 Months, Unrealized Losses (23) (27,795)
12 Months or More, Fair Value 592,840 410,654
12 Months or More, Unrealized Losses (101,287) (63,866)
Total Fair Value 593,430 648,571
Total Unrealized Losses (101,310) (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 92 98
12 Months or More, Unrealized Losses (11) (9)
Total Fair Value 92 98
Total Unrealized Losses (11) (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 166,125 84,177
12 Months or More, Unrealized Losses (32,698) (14,445)
Total Fair Value 166,125 174,985
Total Unrealized Losses (32,698) (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 546 20,825
Less than 12 Months, Unrealized Losses (21) (1,058)
12 Months or More, Fair Value 85,400 88,520
12 Months or More, Unrealized Losses (7,337) (6,745)
Total Fair Value 85,946 109,345
Total Unrealized Losses (7,358) (7,803)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 44 126,284
Less than 12 Months, Unrealized Losses (2) (14,529)
12 Months or More, Fair Value 332,607 229,152
12 Months or More, Unrealized Losses (59,868) (41,384)
Total Fair Value 332,651 355,436
Total Unrealized Losses (59,870) (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 8,616 8,707
12 Months or More, Unrealized Losses (1,373) (1,283)
Total Fair Value 8,616 8,707
Total Unrealized Losses $ (1,373) $ (1,283)