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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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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 |

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- Definition Commitments to extend credit. + References No definition available. + Details
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- Definition Contingencies And Commitments [Line Items] + References No definition available. + Details
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- 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 Reference 2: 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(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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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 -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 Reference 3: 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(19)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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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 No definition available. + Details
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