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GOODWILL, CORE DEPOSIT PREMIUM AND OTHER INTANGIBLE ASSETS (Mortgage and commercial loans servicing narrative) (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
Valuation servicing rights in tranches [Line Items]                
Loans guaranteed and sold with servicing retained   $ 5,469,000     $ 5,469,000   $ 6,736,000  
Valuation allowance         2,000,000.0      
First Bank & Trust                
Valuation servicing rights in tranches [Line Items]                
Mortgage loans serviced for others   661,700,000     661,700,000   616,700,000  
Custodial escrow balances maintained   12,700,000     12,700,000   $ 5,000,000.0  
Mortgage servicing rights                
Valuation servicing rights in tranches [Line Items]                
Sale of mortgage servicing rights         $ 0 $ 20,556,000    
Average constant prepayment rate         17.10%   14.20%  
Servicing assets, discount rate         9.02%   9.03%  
Fees collected for servicing of mortgage loans   $ 410,000   $ 427,000 $ 819,000 854,000    
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum                
Valuation servicing rights in tranches [Line Items]                
Average capitalization rate (percent)   0.0076     0.0076     0.0081
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum                
Valuation servicing rights in tranches [Line Items]                
Average capitalization rate (percent)   0.0116     0.0116     0.0098
Mortgage servicing rights | First Bank & Trust                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   $ 4,500,000     $ 4,500,000   $ 5,600,000  
Commercial servicing rights                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   1,417,000   1,851,000 1,417,000 1,851,000 1,600,000  
Loans guaranteed and sold with servicing retained   $ 74,200,000     $ 74,200,000   $ 82,100,000  
Commercial servicing rights | Minimum                
Valuation servicing rights in tranches [Line Items]                
Average constant prepayment rate         15.22%   14.25%  
Servicing assets, discount rate         8.04%   10.65%  
Commercial servicing rights | Maximum                
Valuation servicing rights in tranches [Line Items]                
Average constant prepayment rate         19.56%   18.08%  
Servicing assets, discount rate         14.40%   13.94%  
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  
Mortgage Servicing Rights 15-year Tranche                
Valuation servicing rights in tranches [Line Items]                
Valuation allowance         $ 516,000   $ 114,000  
Amortization period             15 years  
Mortgage Servicing Rights 30-year Tranche                
Valuation servicing rights in tranches [Line Items]                
Valuation allowance             $ 797,000  
Amortization period             30 years  
Less Than 20 Years                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   $ 247,000     247,000   $ 285,000  
Fees collected for servicing of mortgage loans   54,000   $ 230,000 $ 172,000 $ 610,000    
Period of tranche         20 years      
Valuation allowance     $ 0   $ 0   $ 0  
Amortization period         20 years   20 years  
More Than 20 Years                
Valuation servicing rights in tranches [Line Items]                
Fair value of mortgage servicing rights   1,170,000     $ 1,170,000   $ 1,309,000  
Period of tranche         20 years      
Valuation allowance     $ 0   $ 0   $ 0  
Amortization period         20 years   20 years  
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   36,600,000            
Gain on sale of mortgage servicing rights   $ 14,500,000