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Derivative Financial Instruments (Narrative Disclosures) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Derivatives    
Interest rate swaps - assets $ 946,000 $ 3,069,000
Interest rate swaps - liabilities 946,000 3,069,000
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 swaps - assets 528,000  
Interest rate swaps - liabilities 918,000  
To commercial borrowers, corporation receives fixed rates and pays floating rates | Minimum
    
Derivatives    
Derivative, maturity date Jan. 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 swaps - assets 918,000  
Interest rate swaps - liabilities 528,000  
To dealer countparties, corporation pays fixed rates and receives floating rates | Minimum
    
Derivatives    
Derivative, maturity date Jan. 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    
Derivative, notional amount 31,400,000  
Not designated as hedging instrument | To dealer countparties, corporation pays fixed rates and receives floating rates
    
Derivatives    
Derivative, notional amount 31,400,000  
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 418,000  
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 $ (28,000)