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Subordinated Debt Securities (Narrative) (Details) - USD ($)
$ in Millions
6 Months Ended
Aug. 23, 2007
Jun. 21, 2005
Jun. 30, 2015
Subordinated Debt Due In 2035 [Member] | Trust I [Member]      
Subordinated Borrowing [Line Items]      
Long-term debt, gross   $ 30.9 $ 30.9
Proceeds from issuance of trust preferred securities   30.0  
Proceeds from issuance of common stock   $ 0.9  
Subordinated borrowing, interest rate     7.25%
Debt instrument, interest rate fixed to floating date     Jun. 15, 2015
Debt instrument, maturity date     Jun. 15, 2035
Debt instrument, description of variable rate basis     interest adjusts quarterly to the three-month LIBOR rate plus 3.25 percentage points
Debt instrument, basis spread on variable rate     3.25%
Debt instrument, interest rate, effective percentage     3.54%
Subordinated Debt Due In 2037 [Member] | Trust II [Member]      
Subordinated Borrowing [Line Items]      
Long-term debt, gross $ 25.8   $ 25.8
Proceeds from issuance of trust preferred securities 25.0    
Proceeds from issuance of common stock $ 0.8    
Subordinated borrowing, interest rate     8.28%
Debt instrument, interest rate fixed to floating date     Sep. 15, 2017
Debt instrument, maturity date     Sep. 15, 2037
Debt instrument, description of variable rate basis     three-month LIBOR rate plus 2.90 percentage
Debt instrument, basis spread on variable rate     2.90%