Common Shares [Member] Debt Outstanding [Member] Preferred Shares [Member] Market Events Risk [Member] Preferred, Contingent Capital and Other Subordinated Securities Risk [Member] Contingent Capital Securities Risk [Member] Trust Preferred Securities Risk [Member] Concentration Risk [Member] Financial Services Sector Risk [Member] Credit Risk [Member] High Yield Securities Risk [Member] Credit Agency Risk [Member] Interest Rate and Duration Risk [Member] Liquidity Risk [Member] Foreign Investment Risk [Member] Reinvestment Risk [Member] Selection Risk [Member] Management Risk [Member] Leverage Risk [Member] Risk of Market Price Discount from Net Asset Value [Member] Valuation Risk [Member] Cybersecurity Risk [Member] Common Shares [Member] Debt Outstanding. Preferred Shares. Market Events Risk. Preferred, Contingent Capital and Other Subordinated Securities Risk. Contingent Capital Securities Risk. Trust Preferred Securities Risk. Concentration Risk. Financial Services Sector Risk. Credit Risk. High Yield Securities Risk. Credit Agency Risk. Interest Rate and Duration Risk. Liquidity Risk. Foreign Investment Risk. Reinvestment Risk. Selection Risk. Management Risk. Leverage Risk. Risk of Market Price Discount from Net Asset Value. Valuation Risk. Cybersecurity Risk.