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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 9 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Valuation servicing rights in tranches [Line Items]                  
Loans guaranteed and sold with servicing retained   $ 5,752,000         $ 5,752,000   $ 6,736,000
Valuation allowance             2,100,000    
First Bank & Trust                  
Valuation servicing rights in tranches [Line Items]                  
Mortgage loans serviced for others   709,900,000         709,900,000   616,700,000
Custodial escrow balances maintained   16,900,000         16,900,000   $ 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             16.90%   14.20%
Servicing assets, discount rate             9.02%   9.03%
Fees collected for servicing of mortgage loans   $ 443,000   $ 422,000       $ 1,300,000  
Mortgage servicing rights | Measurement Input, Cap Rate | Minimum                  
Valuation servicing rights in tranches [Line Items]                  
Average capitalization rate (percent)   0.0076   0.0080     0.0076 0.0080  
Mortgage servicing rights | Measurement Input, Cap Rate | Maximum                  
Valuation servicing rights in tranches [Line Items]                  
Average capitalization rate (percent)   0.0116   0.0098     0.0116 0.0098  
Mortgage servicing rights | First Bank & Trust                  
Valuation servicing rights in tranches [Line Items]                  
Fair value of mortgage servicing rights   $ 4,800,000         $ 4,800,000   $ 5,600,000
Commercial servicing rights                  
Valuation servicing rights in tranches [Line Items]                  
Fair value of mortgage servicing rights   1,497,000   $ 1,827,000     1,497,000 $ 1,827,000 1,600,000
Loans guaranteed and sold with servicing retained   $ 71,200,000         $ 71,200,000   $ 82,100,000
Commercial servicing rights | Minimum                  
Valuation servicing rights in tranches [Line Items]                  
Average constant prepayment rate             15.12%   14.25%
Servicing assets, discount rate             6.93%   10.65%
Commercial servicing rights | Maximum                  
Valuation servicing rights in tranches [Line Items]                  
Average constant prepayment rate             18.37%   18.08%
Servicing assets, discount rate             10.43%   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             $ 534,000   $ 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   $ 294,000         294,000   285,000
Fees collected for servicing of mortgage loans   70,000   $ 216,000     $ 242,000 $ 826,000  
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   $ 1,203,000         $ 1,203,000   $ 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