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Goodwill, Core Deposit Intangibles and Other Intangible Assets (Book Value, Fair Value, and Valuation Allowance of Mortgage and Commercial Servicing Rights) (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Mortgage Servicing Rights 15-year Tranche    
Finite-Lived Intangible Assets [Line Items]    
Book Value $ 1,482,000 $ 3,880,000
Fair Value 1,368,000 6,301,000
Impairment 114,000 20,000
Mortgage Servicing Rights 15-year Tranche | Dubuque Bank and Trust Company    
Finite-Lived Intangible Assets [Line Items]    
Book Value 0 2,195,000
Fair Value 0 4,636,000
Impairment 0 0
Mortgage Servicing Rights 15-year Tranche | First Bank & Trust    
Finite-Lived Intangible Assets [Line Items]    
Book Value 1,482,000 1,685,000
Fair Value 1,368,000 1,665,000
Impairment 114,000 20,000
Mortgage Servicing Rights 30-year Tranche    
Finite-Lived Intangible Assets [Line Items]    
Book Value 5,050,000 25,541,000
Fair Value 4,253,000 42,379,000
Impairment 797,000 38,000
Mortgage Servicing Rights 30-year Tranche | Dubuque Bank and Trust Company    
Finite-Lived Intangible Assets [Line Items]    
Book Value 0 20,025,000
Fair Value 0 36,901,000
Impairment 0 0
Mortgage Servicing Rights 30-year Tranche | First Bank & Trust    
Finite-Lived Intangible Assets [Line Items]    
Book Value 5,050,000 5,516,000
Fair Value 4,253,000 5,478,000
Impairment 797,000 38,000
Commercial Servicing Rights less than 20 Years    
Finite-Lived Intangible Assets [Line Items]    
Book Value 129,000 295,000
Fair Value 285,000 491,000
Impairment 0 0
Commercial Servicing Rights less than 20 Years | Citywide Banks    
Finite-Lived Intangible Assets [Line Items]    
Book Value 0 1,000
Fair Value 0 6,000
Impairment 0 0
Commercial Servicing Rights less than 20 Years | Premier Valley Bank    
Finite-Lived Intangible Assets [Line Items]    
Book Value 1,000 45,000
Fair Value 13,000 74,000
Impairment 0 0
Commercial Servicing Rights less than 20 Years | Wisconsin Bank & Trust    
Finite-Lived Intangible Assets [Line Items]    
Book Value 128,000 249,000
Fair Value 272,000 411,000
Impairment 0 0
Commercial Servicing Rights more than 20 Years    
Finite-Lived Intangible Assets [Line Items]    
Book Value 986,000 1,414,000
Fair Value 1,309,000 1,643,000
Impairment 0 0
Commercial Servicing Rights more than 20 Years | Citywide Banks    
Finite-Lived Intangible Assets [Line Items]    
Book Value 0 18,000
Fair Value 0 20,000
Impairment 0 0
Commercial Servicing Rights more than 20 Years | Premier Valley Bank    
Finite-Lived Intangible Assets [Line Items]    
Book Value 135,000 178,000
Fair Value 161,000 184,000
Impairment 0  
Commercial Servicing Rights more than 20 Years | Wisconsin Bank & Trust    
Finite-Lived Intangible Assets [Line Items]    
Book Value 851,000 1,218,000
Fair Value 1,148,000 1,439,000
Impairment $ 0 $ 0