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Note 11 - Collateralized Securities Transactions - Secured Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Securities sold under agreement to repurchase | $ 5,713,212 | $ 7,534,443
Receivables under resale agreements | 5,716,343 | 7,500,002
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities sold under agreement to repurchase | 3,016,984 | 6,664,321
Receivables under resale agreements | 3,019,676 | 6,650,352
Collateralized Mortgage Backed Securities [Member] |  |
Securities sold under agreement to repurchase | 2,694,038 | 842,438
Receivables under resale agreements | 2,696,667 | 849,650
Small Business Administration Loans [Member] |  |
Securities sold under agreement to repurchase | 2,190 | 27,684
Overnight and Continuous [Member] |  |
Securities sold under agreement to repurchase | 2,587,137 | 5,145,495
Receivables under resale agreements | 1,513,424 | 1,231,027
Overnight and Continuous [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities sold under agreement to repurchase | 1,946,890 | 5,117,811
Receivables under resale agreements | 871,805 | 1,231,027
Overnight and Continuous [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities sold under agreement to repurchase | 638,057 |
Receivables under resale agreements | 641,619 |
Overnight and Continuous [Member] | Small Business Administration Loans [Member] |  |
Securities sold under agreement to repurchase | 2,190 | 27,684
Maturity Less than 30 Days [Member] |  |
Securities sold under agreement to repurchase | 3,074,545 | 2,288,545
Receivables under resale agreements | 3,019,960 | 3,272,880
Maturity Less than 30 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities sold under agreement to repurchase | 1,070,094 | 1,546,510
Receivables under resale agreements | 1,016,446 | 2,525,188
Maturity Less than 30 Days [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities sold under agreement to repurchase | 2,004,451 | 742,035
Receivables under resale agreements | 2,003,514 | 747,692
Maturity Less than 30 Days [Member] | Small Business Administration Loans [Member] |  |
Securities sold under agreement to repurchase |  |
Maturity 30 to 90 Days [Member] |  |
Securities sold under agreement to repurchase | 51,530 | 100,403
Receivables under resale agreements | 1,143,143 | 2,421,037
Maturity 30 to 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities sold under agreement to repurchase |  |
Receivables under resale agreements | 1,091,609 | 2,319,079
Maturity 30 to 90 Days [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities sold under agreement to repurchase | 51,530 | 100,403
Receivables under resale agreements | 51,534 | 101,958
Maturity 30 to 90 Days [Member] | Small Business Administration Loans [Member] |  |
Securities sold under agreement to repurchase |  |
Maturity Greater than 90 Days [Member] |  |
Securities sold under agreement to repurchase |  |
Receivables under resale agreements | 39,816 | 575,058
Maturity Greater than 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] |  |
Securities sold under agreement to repurchase |  |
Receivables under resale agreements | 39,816 | 575,058
Maturity Greater than 90 Days [Member] | Collateralized Mortgage Backed Securities [Member] |  |
Securities sold under agreement to repurchase |  |
Receivables under resale agreements |  |
Maturity Greater than 90 Days [Member] | Small Business Administration Loans [Member] |  |
Securities sold under agreement to repurchase |  |

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- Definition Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 2: 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)(2)(i)(A)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 3: 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(3)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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 -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 2: http://fasb.org/us-gaap/role/ref/legacyRef -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 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49176635&loc=d3e9760-107771 Reference 4: 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 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(a)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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