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Derivative Financial Instruments (Narrative Disclosures) (Details) (USD $)
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Derivatives    
Interest rate swap contracts not designated as hedging instruments - assets, gross $ 665,000 $ 946,000
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 665,000 946,000
Derivative asset, fair value, amount offset against collateral 0  
Interest rate derivatives, line item on income statement for gain (loss) other non-interest income  
To commercial borrowers, corporation receives fixed rates and pays floating rates
   
Derivatives    
Interest rate swap contracts not designated as hedging instruments - assets, gross 511,000  
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 615,000  
To commercial borrowers, corporation receives fixed rates and pays floating rates | Minimum
   
Derivatives    
Derivative, maturity date Apr. 15, 2014  
To commercial borrowers, corporation receives fixed rates and pays floating rates | Maximum
   
Derivatives    
Derivative, maturity date Feb. 15, 2023  
To dealer countparties, corporation pays fixed rates and receives floating rates
   
Derivatives    
Interest rate swap contracts not designated as hedging instruments - assets, gross 615,000  
Interest rate swap contracts not designated as hedging instruments - liabilities, gross 511,000  
To dealer countparties, corporation pays fixed rates and receives floating rates | Minimum
   
Derivatives    
Derivative, maturity date Apr. 15, 2014  
To dealer countparties, corporation pays fixed rates and receives floating rates | Maximum
   
Derivatives    
Derivative, maturity date Feb. 15, 2023  
Not Designated as Hedging Instrument | To commercial borrowers, corporation receives fixed rates and pays floating rates
   
Derivatives    
Notional value of interest rate swaps with various commercial borrowers 30,000,000  
Not Designated as Hedging Instrument | To dealer countparties, corporation pays fixed rates and receives floating rates
   
Derivatives    
Notional value of interest rate swaps with various commercial borrowers 30,000,000  
First Business Bank | To dealer countparties, corporation pays fixed rates and receives floating rates
   
Derivatives    
Interest rate derivative instruments not designated as hedging instruments at fair value, net 154,000  
First Business Bank - Milwaukee | To dealer countparties, corporation pays fixed rates and receives floating rates
   
Derivatives    
Interest rate derivative instruments not designated as hedging instruments at fair value, net $ 50,000