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Note 9 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
1 Months Ended
Mar. 31, 2021
Nov. 30, 2018
Mar. 31, 2016
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument, Face Amount       $ 175 $ 105
Six Point Five Percent Fixed To Floating Rate Subordinated Debentures Due March Thirty First Two Thousand Twenty Six Member          
Debt Instrument, Face Amount     $ 50    
Debt Instrument, Basis Spread on Variable Rate     5.16%    
Six Point Five Percent Fixed To Floating Rate Subordinated Debentures Due March Thirty First Two Thousand Twenty Six Member | London Interbank Offered Rate (LIBOR) [Member]          
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate     6.50%    
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member]          
Debt Instrument, Face Amount   $ 55      
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate   6.18%      
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual   $ 25      
Six Point One Eight Percent Fixed To Floating Rate Subordinated Debentures Due December First Two Thousands Twenty Eight [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate   3.15%      
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member]          
Debt Instrument, Face Amount $ 120        
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.00%        
Banking Regulation, Common Equity Tier One Risk-Based Capital, Actual $ 25        
Four Percent Fixed To Floating Rate Subordinated Debentures Due April First Two Thousand Thirty One [Member] | London Interbank Offered Rate (LIBOR) [Member]          
Debt Instrument, Basis Spread on Variable Rate 3.29%