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Fair Value Measurements - Fair Value By Level (Details) - USD ($)	Jun. 30, 2024	Dec. 31, 2023
Assets:
Available for sale debt securities	$ 4,869,027,000	$ 4,822,341,000
Equity Securities	5,337,000	5,417,000
Estimate of Fair Value Measurement
Assets:
Available for sale debt securities	4,869,027,000	4,822,341,000
Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,712,423,000	4,660,099,000
Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	156,604,000	162,242,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement
Assets:
Equity Securities	5,337,000	5,417,000
Marketable Securities	4,874,364,000	4,827,758,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Residential mortgage-backed securities
Assets:
Available for sale debt securities	4,712,423,000	4,660,099,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | States and political subdivisions
Assets:
Available for sale debt securities	156,604,000	162,242,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Assets:
Equity Securities	5,337,000	5,417,000
Marketable Securities	5,337,000	5,417,000
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Assets:
Marketable Securities	4,869,027,000	4,822,341,000
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	4,712,423,000	4,660,099,000
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	$ 156,604,000	$ 162,242,000

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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).

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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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