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10-K Employee Benefit Plans - Components of net periodic benefit cost (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension benefits              
Components of net periodic benefit cost (credit):              
Service cost         $ 0 $ 0  
Interest cost         1,127 1,053  
Other postretirement benefits              
Components of net periodic benefit cost (credit):              
Service cost         522 567  
Interest cost         514 492  
Qualified plan | Underfunded plan | Pension benefits              
Components of net periodic benefit cost (credit):              
Service cost         0 0 $ 0
Interest cost $ 408 $ 282 $ 816 $ 564 1,127 1,053 1,291
Expected return on assets (450) (493) (900) (986) (1,973) (2,028) (2,065)
Amortization of prior service credit         0 0 0
Amortization of net actuarial (gain) loss 128 214 256 428 856 971 862
Net periodic benefit cost 86 3 172 6 10 (4) 88
Qualified plan | Underfunded plan | Other postretirement benefits              
Components of net periodic benefit cost (credit):              
Service cost         522 567 554
Interest cost         514 492 650
Expected return on assets         (12) (19) (17)
Amortization of prior service credit         (79) (79) (79)
Amortization of net actuarial (gain) loss         351 135 306
Net periodic benefit cost         1,296 1,096 1,414
Qualified plan | Unfunded plan | Pension benefits              
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:              
Net (gain) loss         1,155 (162) 794
Amortization of actuarial loss         (856) (1,108) (985)
Amortization of prior service credit         0 0 0
Total recognized in accumulated other comprehensive loss         299 (1,270) (191)
Total recognized in net periodic benefit cost (credit) and accumulated other comprehensive loss         309 (1,274) (103)
Qualified plan | Unfunded plan | Other postretirement benefits              
Components of net periodic benefit cost (credit):              
Service cost 90 131 179 262      
Interest cost 180 128 361 256      
Expected return on assets 5 (3) 12 (6)      
Amortization of prior service credit (20) (20) (40) (40)      
Amortization of net actuarial (gain) loss (44) 88 (89) 176      
Net periodic benefit cost $ 211 $ 324 $ 423 $ 648      
Other changes in plan assets and benefit obligations recognized in accumulated other comprehensive loss:              
Net (gain) loss         (4,833) (2,763) (181)
Amortization of actuarial loss         (351) (135) (306)
Amortization of prior service credit         79 90 90
Total recognized in accumulated other comprehensive loss         (5,105) (2,808) (397)
Total recognized in net periodic benefit cost (credit) and accumulated other comprehensive loss         $ (3,809) $ (1,712) $ 1,017