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Fair Value Measurements (Fair Value By Level) (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Assets:
Available for sale debt securities	$ 4,669,847,000	$ 4,417,796,000
Equity Securities	5,300,000	5,358,000
Estimate of Fair Value Measurement
Assets:
Available for sale debt securities	4,669,847,000	4,417,796,000
Estimate of Fair Value Measurement | US Treasury Securities
Assets:
Available for sale debt securities		49,393,000
Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,508,112,000	4,209,212,000
Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	161,735,000	159,191,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement
Assets:
Equity Securities	5,300,000	5,358,000
Marketable Securities	4,675,147,000	4,423,154,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | US Treasury Securities
Assets:
Available for sale debt securities		49,393,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,508,112,000	4,209,212,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	161,735,000	159,191,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Assets:
Equity Securities	5,300,000	5,358,000
Marketable Securities	5,300,000	5,358,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Assets:
Marketable Securities	4,669,847,000	4,417,796,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | US Treasury Securities
Assets:
Available for sale debt securities		49,393,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,508,112,000	4,209,212,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2 | States and political subdivisions
Assets:
Available for sale debt securities	$ 161,735,000	$ 159,191,000

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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