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Borrowed Funds - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | $ 3,511,656 | $ 3,292,805
Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 2,746,941 |
2 to 29 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements |  | 2,532,305
30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 761,715 | 759,500
Over 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 3,000 | 1,000
U.S. Treasury [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 1,152,251 | 1,355,233
U.S. Treasury [Member] | Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 1,152,251 |
U.S. Treasury [Member] | 2 to 29 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements |  | 1,355,233
U.S. Agencies [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 2,359,405 | 1,937,572
U.S. Agencies [Member] | Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 1,594,690 |
U.S. Agencies [Member] | 2 to 29 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements |  | 1,177,072
U.S. Agencies [Member] | 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 761,715 | 759,500
U.S. Agencies [Member] | Over 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | $ 3,000 | $ 1,000

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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://www.xbrl.org/2003/role/disclosureRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-20 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147483444/210-20-55-15 Reference 4: 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 Reference 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 + Details
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