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Subordinated Debt Securities (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 0 Months Ended
Jun. 21, 2005
Subordinated Debt Due In 2035 [Member]
Jun. 25, 2005
Subordinated Debt Due In 2035 [Member]
Trust I [Member]
Jun. 21, 2005
Subordinated Debt Due In 2035 [Member]
Trust I [Member]
Sep. 30, 2013
Subordinated Debt Due In 2035 [Member]
Trust I [Member]
Aug. 23, 2007
Subordinated Debt Due In 2037 [Member]
Aug. 23, 2007
Subordinated Debt Due In 2037 [Member]
Trust II [Member]
Sep. 30, 2013
Subordinated Debt Due In 2037 [Member]
Trust II [Member]
Subordinated Borrowing [Line Items]              
Long-term debt, gross $ 30.9     $ 30.9 $ 25.8   $ 25.8
Proceeds from issuance of trust preferred securities     30.0     25.0  
Proceeds from issuance of common stock     $ 0.9     $ 0.8  
Subordinated borrowing, interest rate     7.725%     8.28%  
Debt instrument, interest rate fixed to floating date Jun. 15, 2015         Sep. 15, 2017  
Debt instrument, maturity date Jun. 15, 2035       Sep. 15, 2037    
Debt instrument, description of variable rate basis   interest will adjust quarterly to the three-month LIBOR rate plus 3.25 percentage       three-month LIBOR rate plus 2.90 percentage  
Debt instrument, basis spread on variable rate     3.25%     2.90%