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Note 11 - Collateralized Securities Transactions - Secured Borrowings (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Securities sold under agreement to repurchase	$ 3,171,415	$ 5,713,212
Receivables under resale agreements	3,175,645	5,716,343
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities sold under agreement to repurchase		3,016,984
Receivables under resale agreements		3,019,676
Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase		2,694,038
Receivables under resale agreements		2,696,667
Small Business Administration Loans [Member]
Securities sold under agreement to repurchase		2,190
Overnight and Continuous [Member]
Securities sold under agreement to repurchase		2,587,137
Receivables under resale agreements		1,513,424
Overnight and Continuous [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities sold under agreement to repurchase		1,946,890
Receivables under resale agreements		871,805
Overnight and Continuous [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase	0	638,057
Receivables under resale agreements	0	641,619
Overnight and Continuous [Member] | Small Business Administration Loans [Member]
Securities sold under agreement to repurchase		2,190
Maturity Less than 30 Days [Member]
Securities sold under agreement to repurchase		3,074,545
Receivables under resale agreements		3,019,960
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
Receivables under resale agreements		1,016,446
Maturity Less than 30 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase	3,171,415	2,004,451
Receivables under resale agreements	3,175,645	2,003,514
Maturity Less than 30 Days [Member] | Small Business Administration Loans [Member]
Securities sold under agreement to repurchase		0
Maturity 30 to 90 Days [Member]
Securities sold under agreement to repurchase		51,530
Receivables under resale agreements		1,143,143
Maturity 30 to 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities sold under agreement to repurchase		0
Receivables under resale agreements		1,091,609
Maturity 30 to 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase	0	51,530
Receivables under resale agreements	$ 0	51,534
Maturity 30 to 90 Days [Member] | Small Business Administration Loans [Member]
Securities sold under agreement to repurchase		0
Maturity Greater than 90 Days [Member]
Securities sold under agreement to repurchase		0
Receivables under resale agreements		39,816
Maturity Greater than 90 Days [Member] | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member]
Securities sold under agreement to repurchase		0
Receivables under resale agreements		39,816
Maturity Greater than 90 Days [Member] | Collateralized Mortgage Backed Securities [Member]
Securities sold under agreement to repurchase		0
Receivables under resale agreements		0
Maturity Greater than 90 Days [Member] | Small Business Administration Loans [Member]
Securities sold under agreement to repurchase		$ 0

X

- 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://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))
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 4: 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

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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

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-Section 55
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-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 235
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-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

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-Section 50
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-Section S99
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