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Fair Value Measurements (Fair Value By Level) (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Assets:
Available for sale debt securities	$ 4,141,997,000	$ 4,213,920,000
Equity Securities	5,810,000	6,079,000
Estimate of Fair Value Measurement [Member] | US Treasury Securities
Assets:
Available for sale debt securities	49,099,000
Estimate of Fair Value Measurement [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	4,050,353,000	4,169,363,000
Estimate of Fair Value Measurement [Member] | States and Political Subdivisions Debt Securities [Member]
Assets:
Available for sale debt securities	42,545,000	44,557,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
Assets:
Equity Securities	5,810,000	6,079,000
Marketable Securities	4,147,807,000	4,219,999,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | US Treasury Securities
Assets:
Available for sale debt securities	49,099,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	4,050,353,000	4,169,363,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | States and Political Subdivisions Debt Securities [Member]
Assets:
Available for sale debt securities	42,545,000	44,557,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Assets:
Equity Securities	5,810,000	6,079,000
Marketable Securities	5,810,000	6,079,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Assets:
Marketable Securities	4,141,997,000	4,213,920,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | US Treasury Securities
Assets:
Available for sale debt securities	49,099,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Mortgage Backed Securities [Member]
Assets:
Available for sale debt securities	4,050,353,000	4,169,363,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | States and Political Subdivisions Debt Securities [Member]
Assets:
Available for sale debt securities	$ 42,545,000	$ 44,557,000

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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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