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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Contingencies And Commitments [Line Items] |  |
Commitments to extend credit | $ 1,710.0 | $ 1,730.0
Obligations under letters of credit | 54.3 | 50.3
Reserve for credit risk for undisbursed commitments | 7.5 | $ 8.0
Short-term borrowings | 2,070.0 |
Available lines of credit | 305.0 |
Investment securities with carrying value | 2,260.0 |
Secured [Member] |  |
Contingencies And Commitments [Line Items] |  |
Available lines of credit | 7,440.0 |
Available secured borrowing capacity | 5,370.0 |
Investment securities with carrying value | 3,020.0 |
Secured Public Fund [Member] |  |
Contingencies And Commitments [Line Items] |  |
Investment securities with carrying value | 1,380.0 |
Repurchase Agreements [Member] |  |
Contingencies And Commitments [Line Items] |  |
Investment securities with carrying value | 372.5 |
Outstanding Borrowings [Member] |  |
Contingencies And Commitments [Line Items] |  |
Investment securities with carrying value | 1,800.0 |
Unused Borrowing Capacity [Member] |  |
Contingencies And Commitments [Line Items] |  |
Investment securities with carrying value | 796.0 |
Other Purposes [Member] |  |
Contingencies And Commitments [Line Items] |  |
Investment securities with carrying value | $ 51.0 |

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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 Reserve for undisbursed commitments. + References No definition available. + Details
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- 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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- 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 -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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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://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//1943274/2147479617/946-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)(7)) -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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