FHLB and Other Borrowed Funds - Additional Information (Detail) - USD ($)	Dec. 31, 2023	Dec. 31, 2022
Borrowed Funds [Line Items]
FHLB borrowed funds	$ 600,000,000	$ 650,000,000
Long-term advances	600,000,000	600,000,000
Short-term advances		50,000,000
Other short term borrowings	701,300,000	0
Liquidity access	1,370,000,000
Line of credit	1,330,000,000	$ 1,140,000,000
Discount Window
Borrowed Funds [Line Items]
Liquidity access	$ 89,800,000
Discount Window \| Primary Rate
Borrowed Funds [Line Items]
Rate	5.50%
Discount Window \| Secondary Rate
Borrowed Funds [Line Items]
Rate	6.00%
Bank Term Funding Program
Borrowed Funds [Line Items]
Liquidity access	$ 1,280,000,000
Rate	4.84%
Advances drawn	$ 700,000,000
Minimum
Borrowed Funds [Line Items]
FHLB interest rate	3.37%
Maximum
Borrowed Funds [Line Items]
FHLB interest rate	4.84%

Borrowed Funds [Line Items]

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- Definition

Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

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Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date.

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The current portion of Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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

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Interest rate of advances made and reported by Federal Home Loan Bank (FHLBank).

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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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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Amount of borrowings classified as other, maturing within one year or the normal operating cycle, if longer.

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