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Investments (Amortized Cost and Estimated Fair Values of Debt Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale, Amortized Cost
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One	$ 3,718
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five	5,661
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	86,929
Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10	47,022
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Fair Value	148,380
Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, Amortized Cost	143,330
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value	1,359,106
Amortized Cost	1,508,981	$ 1,078,474
Available-for-sale, Fair Value
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One	3,735
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five	6,001
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10	89,042
Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10	49,602
Total	1,507,486	$ 1,115,813
Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost	$ 1,365,651

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