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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
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] |  |
Investment securities pledged as collateral | 6,300,000 | 3,200,000
Assets pledged as collateral | 13,267,247 | 8,297,830
Asset Pledged as Collateral | Public deposits |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Investment securities pledged as collateral | 3,500,000 | 3,000,000
Public deposits | Asset Pledged as Collateral with Right [Member] |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Investment securities pledged as collateral | 3,511,412 | 2,977,693
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 4,817,865 | 3,451,070
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 4,801,873 | 1,704,803
ACH transactions | Asset Pledged as Collateral without Right [Member] |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | 135,512 | 133,173
Interest rate swaps | Asset Pledged as Collateral without Right [Member] |  |
Financial Instruments Owned and Pledged as Collateral [Line Items] |  |
Assets pledged as collateral | $ 585 | $ 31,091

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 + 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://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481961/940-320-45-2 + Details
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