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Investments - Unrealized losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value $ 4,623 $ 237,917
Less than 12 Months, Unrealized Losses (562) (27,795)
12 Months or More, Fair Value 626,606 410,654
12 Months or More, Unrealized Losses (84,444) (63,866)
Total Fair Value 631,229 648,571
Total Unrealized Losses (85,006) (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 98 98
12 Months or More, Unrealized Losses (8) (9)
Total Fair Value 98 98
Total Unrealized Losses (8) (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 178,051 84,177
12 Months or More, Unrealized Losses (22,864) (14,445)
Total Fair Value 178,051 174,985
Total Unrealized Losses (22,864) (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 1,123 20,825
Less than 12 Months, Unrealized Losses (20) (1,058)
12 Months or More, Fair Value 91,267 88,520
12 Months or More, Unrealized Losses (6,660) (6,745)
Total Fair Value 92,390 109,345
Total Unrealized Losses (6,680) (7,803)
Private label mortgage and asset backed securities    
Schedule of Available-for-sale Securities    
Less than 12 Months, Fair Value 3,500 126,284
Less than 12 Months, Unrealized Losses (542) (14,529)
12 Months or More, Fair Value 348,311 229,152
12 Months or More, Unrealized Losses (53,801) (41,384)
Total Fair Value 351,811 355,436
Total Unrealized Losses (54,343) (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 8,879 8,707
12 Months or More, Unrealized Losses (1,111) (1,283)
Total Fair Value 8,879 8,707
Total Unrealized Losses $ (1,111) $ (1,283)