ACQUISITIONS (Tables)
12 Months Ended
Dec. 31, 2016
Business Combinations [Abstract]  
Schedule of assets acquired and liabilities assumed
(in millions)   As recorded by
Baylake Corp
    Fair Value
Adjustments
    As Recorded by
Nicolet
 
Cash, cash equivalents and securities available for sale   $ 262     $ 1     $ 263  
Loans     710       (19 )     691  
Other real estate owned     3       (2 )     1  
Core deposit intangible     1       16       17  
Fixed assets and other assets     71       (8 )     63  
 Total assets acquired   $ 1,047     $ (12 )   $ 1,035  
                         
Deposits   $ 822     $ -     $ 822  
Junior subordinated debentures, borrowings and other liabilities     116       (1 )     115  
Total liabilities acquired   $ 938     $ (1 )   $ 937  
                         
Excess of assets acquired over liabilities acquired   $ 109     $ (11 )   $ 98  
Less: purchase price                     164  
Goodwill                   $ 66  
Schedule of unaudited pro forma information
    Year Ended  
    December 31,  
    2016     2015  
(in thousands, except per share data)            
Total revenues, net of interest expense   $ 110,788     $ 105,288  
Net income     23,263       21,267  
Diluted earnings per share     2.55       2.38