JUNIOR SUBORDINATED DEBENTURES (Detail Textuals 1) - USD ($)
 1 Months Ended
Apr. 30, 2016
Apr. 30, 2013
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jul. 24, 2004
Debt Instrument [Line Items]            
Junior subordinated debentures     $ 24,732,000 $ 12,527,000   $ 6,200,000
Discount accreted to interest expense over the remaining life of the debentures     200,000 200,000 $ 200,000  
Trust preferred securities            
Debt Instrument [Line Items]            
Carrying value of trust preferred securities     23,700,000 12,000,000    
Mid-Wisconsin            
Debt Instrument [Line Items]            
Junior subordinated debentures   $ 10,300,000        
Trust preferred securities issued during period   $ 10,000,000        
Base rate, description   three-month LIBOR        
Basis spread   1.43%        
Debentures, description   The debentures may be called at par plus any accrued but unpaid interest, in part or in full, on or after December 15, 2010 or within 120 days of certain events.        
Fair value of debentures   $ 5,800,000        
Discount accreted to interest expense over the remaining life of the debentures   $ 4,500        
Maturity date of trust preferred securities and debentures   Dec. 15, 2035        
Mid-Wisconsin | Trust preferred securities            
Debt Instrument [Line Items]            
Carrying value of trust preferred securities     6,500,000 $ 6,300,000 $ 6,100,000  
Baylake Corp            
Debt Instrument [Line Items]            
Junior subordinated debentures $ 16,600,000   $ 12,000,000      
Trust preferred securities issued during period $ 16,100,000          
Base rate, description three-month LIBOR plus 1.35          
Basis spread 1.35%          
Debentures, description The debentures may be redeemed on any interest payment date at par in part or in full, on or after June 30, 2011.          
Fair value of debentures $ 11,800,000          
Floor rate 2.35%          
Maturity date of trust preferred securities and debentures Sep. 30, 2036