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Fair Value (Fair Value By Level) (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Assets:
Available for sale debt securities	$ 4,171,881,000	$ 3,080,768,000
Equity Securities	6,136,000	6,202,000
Marketable Securities	4,181,417,000	3,090,370,000
Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,123,636,000	3,029,954,000
Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	48,245,000	50,814,000
Recurring | Estimate of Fair Value Measurement
Assets:
Marketable Securities	4,178,017,000	3,086,970,000
Recurring | Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,123,636,000	3,029,954,000
Recurring | Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	48,245,000	50,814,000
Recurring | Estimate of Fair Value Measurement | Equity Securities
Assets:
Equity Securities	6,136,000	6,202,000
Recurring | Estimate of Fair Value Measurement | Level 1
Assets:
Marketable Securities	6,136,000	6,202,000
Recurring | Estimate of Fair Value Measurement | Level 1 | Equity Securities
Assets:
Equity Securities	6,136,000	6,202,000
Recurring | Estimate of Fair Value Measurement | Level 2
Assets:
Marketable Securities	4,171,881,000	3,080,768,000
Recurring | Estimate of Fair Value Measurement | Level 2 | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,123,636,000	3,029,954,000
Recurring | Estimate of Fair Value Measurement | Level 2 | States and political subdivisions
Assets:
Available for sale debt securities	$ 48,245,000	$ 50,814,000

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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-Publisher FASB
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