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Other Borrowings - FHLB and FRB Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
FHLB Advances |  |
Outstanding advances | $ 100,000 | $ 0
Loans | $ 31,931,916 | $ 29,821,418
Asset Pledged as Collateral [Member] |  |
FHLB Advances |  |
Financing Receivable, Pledging Purpose [Extensible Enumeration] | Federal Funds Purchased | Federal Funds Purchased
Short term borrowings |  |
FHLB Advances |  |
Long-term Debt, Weighted Average Interest Rate, over Time | 5.08% | 5.22%
FRB Borrowings | Asset Not Pledged as Collateral and Asset Pledged as Collateral without Right [Member] |  |
FHLB Advances |  |
Outstanding advances | $ 1,900,000 |
Net eligible loans | 2,700,000 |
FHLB Advances |  |
FHLB Advances |  |
Outstanding advances | 100,000 |
Average amount of FHLB advances outstanding | 243,000 | $ 11,000
Total borrowing capacity at FHLB | 7,100,000 |
FHLB Advances | Loans [Member] |  |
FHLB Advances |  |
Loans pledged via a blanket lien to the FHLB for advances and letters of credit | 11,400,000 |
Debt Instrument Collateral Amount | 6,500,000 |
FHLB Advances | Investments Securities and Cash [Member] |  |
FHLB Advances |  |
Investment securities pledged | 729,400 |
Debt Instrument Collateral Amount | 617,600 |
FHLB Advances |  |
FHLB Advances |  |
Letter of credit borrowed | 2,900 |
Unused net credit available with the FHLB | 7,000,000 |
FRB Borrowings |  |
FHLB Advances |  |
Letter of credit borrowed | 0 |
Maximum borrowing capacity | $ 1,900,000 |
FRB Borrowings | Asset Not Pledged as Collateral and Asset Pledged as Collateral without Right [Member] |  |
FHLB Advances |  |
Financing Receivable, Pledging Purpose [Extensible Enumeration] | Federal Funds Purchased |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + Details
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- Definition Amount of advances or credit lines available from the Federal Home Loan Bank (FHLB). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(3)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22 (b)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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