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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Mortgage and commercial loans servicing narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Aug. 01, 2019
USD ($)
Mar. 31, 2019
Valuation servicing rights in tranches [Line Items]                
Loans guaranteed and sold with servicing retained   $ 6,271,000   $ 6,271,000   $ 31,072,000    
Valuation allowance       1,600,000   58,000    
First Bank & Trust                
Valuation servicing rights in tranches [Line Items]                
Mortgage loans serviced for others   621,500,000   621,500,000   648,900,000    
Custodial escrow balances maintained   16,300,000   16,300,000   $ 5,900,000    
Mortgage servicing rights                
Valuation servicing rights in tranches [Line Items]                
Sale of mortgage servicing rights       $ 20,556,000 $ 0      
Average constant prepayment rate       16.40%   10.30%    
Servicing assets, discount rate       9.03%   9.03%    
Fees collected for servicing of mortgage loans   $ 422,000 $ 2,600,000 $ 1,300,000 7,300,000      
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum                
Valuation servicing rights in tranches [Line Items]                
Average capitalization rate (percent)   0.0080   0.0080       0.0093
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum                
Valuation servicing rights in tranches [Line Items]                
Average capitalization rate (percent)   0.0098   0.0098       0.0117
Mortgage servicing rights | First Bank & Trust                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   $ 5,000,000.0   $ 5,000,000.0   $ 7,100,000    
Commercial servicing rights                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   1,827,000 2,529,000 1,827,000 2,529,000 2,100,000    
Loans guaranteed and sold with servicing retained   $ 87,000,000.0   $ 87,000,000.0   $ 107,400,000    
Commercial servicing rights | Minimum                
Valuation servicing rights in tranches [Line Items]                
Average constant prepayment rate       13.11%   11.01%    
Servicing assets, discount rate       9.77%   13.44%    
Commercial servicing rights | Maximum                
Valuation servicing rights in tranches [Line Items]                
Average constant prepayment rate       16.60%   13.50%    
Servicing assets, discount rate       14.41%   16.96%    
Commercial servicing rights | Measurement Input, Cap Rate | Minimum                
Valuation servicing rights in tranches [Line Items]                
Average capitalization rate (percent)   0.0310   0.0310   0.0310    
Commercial servicing rights | Measurement Input, Cap Rate | Maximum                
Valuation servicing rights in tranches [Line Items]                
Average capitalization rate (percent)   0.0445   0.0445   0.0445    
Less Than 20 Years                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   $ 348,000   $ 348,000   $ 491,000    
Fees collected for servicing of mortgage loans   216,000 $ 401,000 $ 826,000 $ 1,200,000      
Period of tranche       20 years        
Valuation allowance       $ 7,000   $ 0    
Amortization period       20 years   20 years    
More Than 20 Years                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   1,478,000   $ 1,478,000   $ 1,643,000    
Period of tranche       20 years        
Valuation allowance       $ 0   $ 0    
Amortization period       20 years   20 years    
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    
Dubuque Bank and Trust Company | Mortgage servicing rights                
Valuation servicing rights in tranches [Line Items]                
Unpaid principal balance $ 3,310,000,000              
Sale of mortgage servicing rights $ 20,600,000              
Cash received from sale of Mortgage servicing rights   34,800,000            
Gain on sale of mortgage servicing rights   13,300,000            
Loans payable   $ 293,000   $ 293,000