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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