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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 | Dec. 31, 2023
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
In-substance debt defeasance | $ 0 | $ 0
Carrying amounts of the assets pledged as collateral |  |
Securities for reverse repurchase agreements | 0 | 0
Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 10,576,390 | 11,278,394
Public deposits | Asset Pledged as Collateral with Right |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 1,978,675 | 2,571,359
Federal Home Loan Bank Advances | Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 4,888,990 | 4,495,266
Federal Reserve Bank Advances | Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 3,708,286 | 4,074,093
ACH transactions | Asset Pledged as Collateral without Right |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral |  | 137,101
Interest rate swaps | Asset Pledged as Collateral without Right |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | $ 439 | $ 575

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- Definition 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. + 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(11)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479170/946-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481444/860-30-45-1 + Details
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- Definition The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 940 -SubTopic 320 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479035/940-320-45-2 + Details
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