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Other Assets Other Assets Tax Credit Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Tax Credit Carryforward [Line Items]      
Investment in limited partnerships $ 4,176,000 $ 4,261,000  
Investment Tax Credit Impairment Cost 2,083,000 2,784,000 $ 3,691,000
Investment in Community Development Entities $ 6,081,000 6,591,000  
Rimrock Road | New Market Tax Credits      
Tax Credit Carryforward [Line Items]      
New Market Tax Credit Benefit, Period of Recognition 7 years    
Federal New Market Tax Credits Not Yet Recognized $ 900,000    
Tax Credit Benefits Recognized 450,000 450,000  
Madison, Wisconsin | BOC Investment | Historic Rehabilitation Tax Credits      
Tax Credit Carryforward [Line Items]      
Investment in limited partnerships 104,000 174,000  
Capital Contributions     2,800,000
Investment Tax Credit Impairment Cost     3,300,000
Tax Credit Benefits Recognized     $ 3,800,000
Milwaukee, Wisconsin | Mitchell Street Apartments | Historic Rehabilitation Tax Credits      
Tax Credit Carryforward [Line Items]      
Investment in limited partnerships 570,000 570,000  
Capital Contributions 217,000 4,900,000  
Investment Tax Credit Impairment Cost 217,000 2,300,000  
Gain on Sale of Tax Credits, Before Tax   210,000  
Tax Credit Benefits Recognized   3,000,000  
Milwaukee, Wisconsin | FBB Tax Credit | Historic Rehabilitation Tax Credits      
Tax Credit Carryforward [Line Items]      
Investment in limited partnerships 324,000    
Estimated Capital Contributions 4,600,000    
Investment Tax Credit Impairment Cost 873,000    
Tax Credit Benefits Recognized 1,300,000    
Kenosha, Wisconsin | FBB Tax Credit | Historic Rehabilitation Tax Credits      
Tax Credit Carryforward [Line Items]      
Investment in limited partnerships 417,000 $ 417,000  
Estimated Capital Contributions 2,100,000    
Waukesha, Wisconsin | FBB Tax Credit | Historic Rehabilitation Tax Credits      
Tax Credit Carryforward [Line Items]      
Investment in limited partnerships 238,000    
Estimated Capital Contributions 2,200,000    
Investment Tax Credit Impairment Cost 544,000    
Tax Credit Benefits Recognized $ 868,000