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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Contingencies And Commitments [Line Items]
Commitments to extend credit	$ 1,720.0	$ 1,710.0
Obligations under letters of credit	60.0	54.3
Reserve for credit risk for undisbursed commitments	6.3	7.5
Short-term borrowings	500.0
Available lines of credit	305.0
Maximum Contribute Capital	45.8	$ 8.7
Investment securities with carrying value	2,790.0
Secured [Member]
Contingencies And Commitments [Line Items]
Available lines of credit	5,730.0
Available secured borrowing capacity	5,230.0
Secured Public Fund [Member]
Contingencies And Commitments [Line Items]
Investment securities with carrying value	1,180.0
Repurchase Agreements [Member]
Contingencies And Commitments [Line Items]
Investment securities with carrying value	315.0
Unused Borrowing Capacity [Member]
Contingencies And Commitments [Line Items]
Investment securities with carrying value	1,630.0
Other Purposes [Member]
Contingencies And Commitments [Line Items]
Investment securities with carrying value	$ 57.0

X

- Definition

Commitments to extend credit.

+ References

No definition available.

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- Definition

Contingencies And Commitments [Line Items]

+ References

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- Definition

Maximum contribute capital

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No definition available.

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- Definition

Reserve for undisbursed commitments.

+ References

No definition available.

+ Details

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X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(19)(b))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481544/470-10-50-6

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section S99
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-04(13)(a)(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1

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- Definition

Debt securities issued by a United States government agency such as Government National Mortgage Association (Ginnie Mae), Federal Home Loan Mortgage Corporation (Freddie Mac), and Federal National Mortgage Association (Fannie Mae), which are short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References

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