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Goodwill, Core Deposit Intangibles and Other Intangible Assets (Mortgage and Commercial Loans Servicing Narrative) (Details)
3 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Aug. 01, 2019
USD ($)
Valuation servicing rights in tranches [Line Items]            
Mortgage loans serviced for others     $ 616,700,000 $ 648,900,000    
Custodial escrow balances maintained     5,000,000.0 5,900,000    
Servicing rights, net     6,736,000 31,072,000    
PNC Bank, N.A.            
Valuation servicing rights in tranches [Line Items]            
Custodial escrow balances maintained           $ 22,900,000
Dubuque Bank and Trust Company            
Valuation servicing rights in tranches [Line Items]            
Custodial escrow balances maintained       17,700,000    
Mortgage Servicing Rights            
Valuation servicing rights in tranches [Line Items]            
Fair value of mortgage servicing rights     5,621,000 7,000,000.0    
Fees collected for servicing of mortgage loans     4,900,000 $ 9,900,000 $ 11,600,000  
Mortgage Servicing Rights | Dubuque Bank and Trust Company            
Valuation servicing rights in tranches [Line Items]            
Unpaid principal balance $ 3,310,000,000          
Mortgage servicing rights   $ 20,600,000        
Cash received from sale of Mortgage servicing rights     $ 36,600,000      
Gain on sale of mortgage servicing rights   $ 14,500,000        
Mortgage Servicing Rights | First Bank & Trust            
Valuation servicing rights in tranches [Line Items]            
Prepayment rate (as a percent)       10.30%    
Mortgage Servicing Rights | Minimum            
Valuation servicing rights in tranches [Line Items]            
Prepayment rate (as a percent)     14.20%      
Discount rate (as a percent)     9.03%      
Commercial Servicing Rights            
Valuation servicing rights in tranches [Line Items]            
Fair value of mortgage servicing rights     $ 1,594,000 $ 2,134,000    
Fees collected for servicing of mortgage loans     1,000,000.0 1,600,000    
Servicing rights, net     $ 82,100,000 $ 107,400,000    
Commercial Servicing Rights | Minimum            
Valuation servicing rights in tranches [Line Items]            
Prepayment rate (as a percent)     14.25% 11.01%    
Discount rate (as a percent)     10.65% 13.44%    
Commercial Servicing Rights | Maximum            
Valuation servicing rights in tranches [Line Items]            
Prepayment rate (as a percent)     18.08% 13.50%    
Discount rate (as a percent)     13.94% 16.96%    
Commercial Servicing Rights less than 20 Years            
Valuation servicing rights in tranches [Line Items]            
Fair value of mortgage servicing rights     $ 285,000 $ 491,000    
Servicing rights, term     20 years      
Servicing rights, valuation allowance     $ 0 0    
Amortization period     20 years      
Commercial Servicing Rights more than 20 Years            
Valuation servicing rights in tranches [Line Items]            
Fair value of mortgage servicing rights     $ 1,309,000 1,643,000    
Servicing rights, term     20 years      
Servicing rights, valuation allowance     $ 0 0    
Amortization period     20 years      
Mortgage Servicing Rights 15-year Tranche            
Valuation servicing rights in tranches [Line Items]            
Fair value of mortgage servicing rights     $ 1,368,000 6,301,000    
Servicing rights, valuation allowance     $ 114,000 $ 20,000    
Amortization period     15 years 15 years    
Mortgage Servicing Rights 30-year Tranche            
Valuation servicing rights in tranches [Line Items]            
Fair value of mortgage servicing rights     $ 4,253,000 $ 42,379,000    
Servicing rights, valuation allowance     $ 797,000 $ 38,000    
Amortization period     30 years 30 years    
Measurement Input, Cap Rate | Mortgage Servicing Rights | Minimum            
Valuation servicing rights in tranches [Line Items]            
Average capitalization rate (percent)     0.0080 0.0093    
Measurement Input, Cap Rate | Mortgage Servicing Rights | Maximum            
Valuation servicing rights in tranches [Line Items]            
Average capitalization rate (percent)     0.0103 0.0117    
Measurement Input, Cap Rate | Commercial Servicing Rights | Minimum            
Valuation servicing rights in tranches [Line Items]            
Average capitalization rate (percent)     0.0310 0.0310    
Measurement Input, Cap Rate | Commercial Servicing Rights | Maximum            
Valuation servicing rights in tranches [Line Items]            
Average capitalization rate (percent)     0.0445 0.0445