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Statements of Cash Flows (Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Interest $ 22,712 $ 22,699
Federal income tax 57,000 61,000
Operating cash flows from operating leases 5,773 6,096
Operating cash flows from financing leases 41 33
Financing cash flows from finance leases 1,933 1,819
Assets acquired under finance lease arrangements 1,584 650
Assets acquired under operating lease arrangements 5,068 15,514
Non-cash purchase of property and equipment 22 0
Equity Securities [Member]    
Conversion of AFS fixed income securities to equity securities 0 1,463
Available-for-sale Securities [Member]    
Corporate actions related to securities [1] $ 18,840 $ 32,546
[1] Examples of corporate actions include like-kind exchanges, non-cash acquisitions, and stock splits.