XML 55 R45.htm IDEA: XBRL DOCUMENT v3.23.2
Debt Securities - Debt securities in an unrealized loss position (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value    
Less than 12 months $ 131,838 $ 1,070,674
12 months or more 2,133,219 1,368,859
Total 2,265,057 2,439,533
Unrealized Losses    
Less than 12 months (3,850) (81,841)
Unrealized Losses (293,119) (229,363)
Total (296,969) (311,204)
Fair Value    
Less than 12 months 0 58,065
12 months or more 746,502 727,230
Total 746,502 785,295
Unrealized Losses    
Less than 12 months 0 (8,009)
12 months or more (147,600) (125,008)
Total (147,600) (133,017)
U.S. Treasury securities    
Fair Value    
Less than 12 months 1,168 74
12 months or more 58,762 113,987
Total 59,930 114,061
Unrealized Losses    
Less than 12 months (28) 0
Unrealized Losses (2,037) (3,744)
Total (2,065) (3,744)
Obligations of U.S. government corporations and agencies    
Fair Value    
Less than 12 months 4,146 19,603
12 months or more 6,821 0
Total 10,967 19,603
Unrealized Losses    
Less than 12 months (98) (321)
Unrealized Losses (183) 0
Total (281) (321)
Obligations of states and political subdivisions    
Fair Value    
Less than 12 months 84,821 166,147
12 months or more 142,226 75,217
Total 227,047 241,364
Unrealized Losses    
Less than 12 months (1,112) (10,059)
Unrealized Losses (21,510) (16,016)
Total (22,622) (26,075)
Asset-backed securities    
Fair Value    
Less than 12 months 0 390,164
12 months or more 473,897 79,711
Total 473,897 469,875
Unrealized Losses    
Less than 12 months 0 (15,648)
Unrealized Losses (13,108) (4,035)
Total (13,108) (19,683)
Commercial mortgage-backed securities    
Fair Value    
Less than 12 months 0 89,428
12 months or more 103,763 18,966
Total 103,763 108,394
Unrealized Losses    
Less than 12 months 0 (12,623)
Unrealized Losses (16,833) (3,406)
Total (16,833) (16,029)
Fair Value    
Less than 12 months 0 58,065
12 months or more 388,089 353,017
Total 388,089 411,082
Unrealized Losses    
Less than 12 months 0 (8,009)
12 months or more (75,806) (55,729)
Total (75,806) (63,738)
Residential mortgage-backed securities    
Fair Value    
Less than 12 months 30,250 366,221
12 months or more 1,136,283 876,668
Total 1,166,533 1,242,889
Unrealized Losses    
Less than 12 months (1,650) (38,111)
Unrealized Losses (216,651) (182,606)
Total (218,301) (220,717)
Fair Value    
Less than 12 months 0 0
12 months or more 358,413 374,213
Total 358,413 374,213
Unrealized Losses    
Less than 12 months 0 0
12 months or more (71,794) (69,279)
Total (71,794) (69,279)
Corporate debt securities    
Fair Value    
Less than 12 months 11,453 39,037
12 months or more 211,467 204,310
Total 222,920 243,347
Unrealized Losses    
Less than 12 months (962) (5,079)
Unrealized Losses (22,797) (19,556)
Total $ (23,759) $ (24,635)