JUNIOR SUBORDINATED DEBENTURES (Detail Textuals) - USD ($)
$ in Thousands
1 Months Ended
Jul. 31, 2004
Dec. 31, 2016
Dec. 31, 2015
Jul. 24, 2004
Debt Type [Line Items]        
Junior subordinated debentures   $ 24,732 $ 12,527 $ 6,200
Subordinated debentures, fixed rate 8.00%      
Maturity date of the debenture, if not redeemed Jul. 15, 2009      
Nicolet Bankshares Statutory Trust I        
Debt Type [Line Items]        
Junior subordinated debentures       $ 6,000