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Securities Sold Under Agreements to Repurchase - Remaining Contractual Maturities Of Repurchase Agreements (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | $ 2,389,619 | $ 2,249,861
Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 1,982,500 |
2 to 29 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 270,917 | 1,759,559
30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 135,452 | 489,302
Over 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 750 | 1,000
U.S. Treasury [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements |  | 2,440
U.S. Treasury [Member] | 2 to 29 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements |  | 2,440
U.S. Agencies [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 2,389,619 | 2,247,421
U.S. Agencies [Member] | Overnight [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 1,982,500 |
U.S. Agencies [Member] | 2 to 29 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 270,917 | 1,757,119
U.S. Agencies [Member] | 30 to 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | 135,452 | 489,302
U.S. Agencies [Member] | Over 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Total repurchase agreements | $ 750 | $ 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 -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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