Federal Home Loan Bank Advances and Other Borrowings - Narrative (Details)	12 Months Ended
Dec. 31, 2023 USD ($) bank	Dec. 31, 2022 USD ($)
Federal Home Loan Bank Advances and Other Borrowings
Maximum percentage of assets up to which advances will be provided by FHLB	30.00%
Maximum credit line available from FHLB	$ 6,080,000,000.00
Additional available advances	4,400,000,000
Aggregate principal balance of real estate loans used to collateralize FHLB advances	7,410,000,000
Overnight FHLB advances	$ 600,000,000
Maximum amount outstanding in respect of term advances		$ 1,000,000,000
Term advances, rate	3.17%	3.19%
Eight Correspondent Banks \| Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Amount outstanding	$ 0	$ 0
US Bank \| Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	25,000,000
Amount outstanding	$ 0	$ 0
Unsecured lines of credit \| Eight Correspondent Banks \| Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Number of correspondent banks \| bank	7
Unused facility	$ 390,000,000
Federal Reserve discount window \| Eight Correspondent Banks \| Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	2,930,000,000
Federal Reserve Board Funding Program \| Eight Correspondent Banks \| Line of Credit
Federal Home Loan Bank Advances and Other Borrowings
Unused facility	$ 953,500,000

Advances from Federal Home Loan Banks, Overnight

No definition available.

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- Definition

Represents the maximum percentage of assets up to which advances will be provided by the Federal Home Loan Bank (FHLB).

+ References

No definition available.

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- Definition

Represents the number of banks providing financing under the credit facility.

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Represents the maximum balance outstanding at any month end during the period as of the Balance Sheet date in respect of term advances.

+ References

No definition available.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB).

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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States the interest rate applicable to Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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- Definition

Amount of maximum advances or credit lines available from the Federal Home Loan Bank (FHLB).

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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