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Note 16 - Regulatory Matters (Details Textual) $ in Billions |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2019 | Jan. 01, 2016 | Sep. 30, 2020 | Jan. 01, 2020 USD ($) | Jan. 01, 2015
Tier One Risk Based Common Equity Capital Required For Capital Adequacy To Risk Weighted Assets |  |  |  |  | 4.50%
Tier One Risk Based Common Equity Capital Required To Be Well Capitalized To Risk Weighted Assets |  |  |  |  | 6.50%
Banking Regulation, Tier One Risk-Based Capital Ratio, Capital Adequacy, Minimum |  |  |  |  | 0.040
Banking Regulation, Tier One Risk-Based Capital Ratio, Well Capitalized, Minimum |  |  |  |  | 0.060
Increased Tier One Risk Based Capital Required For Capital Adequacy To Risk Weighted Assets |  |  |  |  | 0.060
Increased Tier One Risk Based Capital Required To Be Well Capitalized To Risk Weighted Assets |  |  |  |  | 0.080
Capital Conservation Buffer | 2.50% | 0.625% | 2.50% |  |
Required Assets To Liabilities Ratio After Dividend Effect |  |  | 1.25 |  |
Minimum [Member] |  |  |  |  |
Regulatory Assets, Total |  |  |  | $ 3 |

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- Definition The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 980 -SubTopic 340 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6499975&loc=d3e44250-110382 + Details
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- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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