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Fair Value of Assets and Liabilities - Schedule of Carrying Amount, Fair Value, and Fair Value Hierarchy of Financial Instruments (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Financial Instruments - Assets
Held-to-Maturity: Fair Value	$ 4,104,622,000	$ 4,253,637,000
Carrying Amount
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,913,457,000	4,997,335,000
Loans	13,586,807,000	13,698,701,000
Financial Instruments - Liabilities
Time Deposits	3,079,187,000	3,057,302
Securities Sold Under Agreements to Repurchase	150,490,000	150,490,000
Other Debt	550,000,000	550,000,000
Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	4,104,622,000	4,253,637,000
Loans	12,639,643,000	12,872,260,000
Financial Instruments - Liabilities
Time Deposits	3,060,493,000	3,043,258
Securities Sold Under Agreements to Repurchase	152,830,000	155,461,000
Other Debt	545,546,000	541,466,000
Quoted Prices in Active Markets for Identical Assets or Liabilities (Level 1) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	115,118,000	116,531,000
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	0	0
Significant Other Observable Inputs (Level 2) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	3,989,504,000	4,137,106,000
Loans	0	0
Financial Instruments - Liabilities
Time Deposits	3,060,493,000	3,043,258
Securities Sold Under Agreements to Repurchase	152,830,000	155,461,000
Other Debt	545,546,000	541,466,000
Significant Other Unobservable Inputs (Level 3) | Fair Value
Financial Instruments - Assets
Held-to-Maturity: Fair Value	0	0
Loans	12,639,643,000	12,872,260,000
Financial Instruments - Liabilities
Time Deposits	0	0
Securities Sold Under Agreements to Repurchase	0	0
Other Debt	$ 0	$ 0

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- Definition

Fair value of time deposits that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required. Time deposits include, but are not limited to, certificates of deposits, individual retirement accounts and open accounts.

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Long term debt excluding capital lease obligations fair value.

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- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
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-Section 50
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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-Section S99
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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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