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Subordinated Debt Securities (Narrative) (Details) - USD ($)
$ in Millions
9 Months Ended
Jun. 16, 2015
Aug. 23, 2007
Jun. 21, 2005
Sep. 30, 2016
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     7.725%  
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, interest rate, effective percentage       4.10%
Subordinated Debt Due In 2035 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Trust I [Member]        
Subordinated Borrowing [Line Items]        
Debt instrument, basis spread on variable rate 3.25%      
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
Subordinated Debt Due In 2037 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Trust II [Member]        
Subordinated Borrowing [Line Items]        
Debt instrument, basis spread on variable rate   2.90%