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Borrowings - Additional Information (Details) - USD ($) $ in Thousands |  |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 31, 2027 | May 31, 2026 | Dec. 31, 2024 | May 31, 2024 | Dec. 31, 2023 | Jun. 30, 2024
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Customer repurchase agreements |  |  |  |  | $ 271,642 | $ 268,826
Weighted average interest rates |  |  |  |  | 0.29% | 0.51%
Secured Debt [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Investment securities with carrying value |  |  |  |  |  | $ 2,180,000
Repurchase Agreements [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Investment securities with carrying value |  |  |  |  |  | 363,300
Borrowings [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Investment securities with carrying value |  |  |  |  |  | 1,350,000
Unused lines of Credit [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Investment securities with carrying value |  |  |  |  |  | 427,400
Other Purposes [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Investment securities with carrying value |  |  |  |  |  | 46,000
Federal Home Loan Bank Advances [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Subordinated Borrowing, Interest Rate |  |  |  |  | 4.78% |
Other Short-Term Borrowings |  |  |  |  | $ 160,000 | 500,000
Weighted average interest rates |  |  |  |  | 5.70% |
Borrowed funds cost percentage | 4.27% | 4.73% |  |  |  |
Short term borrowings |  |  |  |  | $ 2,070,000 |
Short Term Advances |  |  |  |  | $ 1,910,000 |
Loans pledged as collaterals |  |  |  |  |  | 4,450,000
Maturities of Subordinated Debt | $ 200,000 | $ 300,000 | $ 1,200,000 | $ 695,000 |  |
Federal Reserve's Bank Term Funding Program [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 1,800,000
Borrowed funds cost percentage |  |  |  |  |  | 4.76%
Borrowings |  |  |  |  |  | $ 1,300,000

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- Definition The cash outflow for a long-term borrowing where lender is placed in a lien position behind debt having a higher priority of repayment (senior) in case of liquidation of the entity's assets as it matures. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-15 + Details
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- Definition Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + 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)(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.12-12A(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14(Column A)(Footnote 2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-6 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 946 -SubTopic 320 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-12B(Column A)(Footnote 4)(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477271/946-320-S99-3 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483466/210-20-50-3 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 10 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-10 + Details
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