Call Prepayment And Reinvestment Risk [Member] Call/Prepayment and Reinvestment Risk [Member] Call Prepayment And Reinvestment Risk [Member] Stock that is subordinate to all other stock of the issuer. Common Stocks [Member] Common Stock [Member] Concentration In Banking Industry Financial Sector Risk [Member] Concentration In Banking Industry Financial Sector Risk [Member] Convertible Securities/Contingent Convertible Securities Risk [Member] Convertible Securities Contingent Convertible Securities Risk [Member] Convertible Securities Contingent Convertible Securities Risk [Member] Credit Facility [Member] Credit Facility [Member] Credit Risks [Member] Credit Risk [Member] Credit Risks [Member] Illiquid And Restricted Securities Risk [Member] Illiquid And Restricted Securities Risk [Member] Investment And Market Risk [Member] Leverage Risk [Member] Leverage Risk [Member] Preferred And Debt Securities Risk [Member] Preferred And Debt Securities Risk [Member] Preferred Stock [Member] Preferred Stocks [Member] Preferred Stocks [Member] Regulatory Capital Relief Securities Risk [Member] Regulatory Capital Relief Securities Risk [Member] Regulatory Risk [Member] Regulatory Risk [Member] Class of Stock [Domain] Debt Instrument Name [Domain]