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Loans, Allowance for Loan Losses and Impaired Loans (Details Textual)
12 Months Ended 22 Months Ended
Sep. 30, 2016
USD ($)
TDR
Contract
Sep. 30, 2015
USD ($)
TDR
Contract
Sep. 30, 2016
USD ($)
TDR
Contract
Sep. 30, 2015
USD ($)
TDR
Dec. 31, 2015
May 16, 2016
USD ($)
Feb. 29, 2016
USD ($)
Jan. 31, 2016
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Oct. 31, 2012
USD ($)
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Carrying amount $ 574,439,000 $ 450,510,000 $ 574,439,000 $ 450,510,000           $ 470,366,000  
Board of Director limit on purchase of loans under loan purchase agreement                 $ 50,000,000   $ 40,000,000
Percentage of loan amounts deposited into cash reserve account                     3.00%
Maximum restricted reserve account balance                     $ 1,000,000
Gross loans 574,248,000 $ 448,080,000 574,248,000 $ 448,080,000              
Cash reserve account balance $ 1,000,000   $ 1,000,000                
Interest rate, stated percentage 3.44% 0.00% 3.44% 0.00%   3.3366%   4.25%      
Recorded Investment $ 3,733,000 $ 4,010,000 $ 3,733,000 $ 4,010,000              
Total impaired loans $ 10,369,000 $ 5,314,000 $ 10,369,000 $ 5,314,000              
Number of delinquent TDR | TDR 3 4 3 4              
Recorded investment in delinquent TDR $ 226,000 $ 191,000 $ 226,000 $ 191,000              
Subsequent default, number of contracts | Contract 21 8 8                
Nonperforming loans                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Past due, minimum period     90 days 90 days              
Substandard                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans $ 6,167,000 $ 1,808,000 $ 6,167,000 $ 1,808,000              
Recorded Investment 1,664,000   $ 1,664,000                
Consumer non-real estate                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Interest rate     4.24%   4.00%            
Central Bank in Rice Lake and Barron                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Carrying amount             $ 16,363,000        
Community Bank of Northern Wisconsin                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Carrying amount           $ 111,740,000          
Originated Loans                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans 470,242,000 448,080,000 $ 470,242,000 448,080,000              
Recorded Investment 3,733,000 4,010,000 3,733,000 4,010,000              
Originated Loans | Substandard                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans 2,102,000   2,102,000                
Originated Loans | Performing loans                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Recorded Investment 3,218,000   3,218,000                
Acquired Loans                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Carrying amount 102,282,000   102,282,000                
Gross loans 104,006,000 0 104,006,000 0              
Recorded Investment 4,972,000   4,972,000                
Acquired Loans | Substandard                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans 4,065,000   4,065,000                
Acquired Loans | Performing loans                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Recorded Investment 3,881,000   3,881,000                
Consumer non-real estate:                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Total impaired loans $ 589,000 $ 848,000 589,000 848,000              
Subsequent default, number of contracts | Contract 4 5                  
Consumer non-real estate: | Purchased indirect paper                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans $ 49,221,000 $ 39,705,000 49,221,000 39,705,000              
Consumer non-real estate: | Purchased indirect paper | Substandard                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans 0 178,000 0 178,000              
Consumer non-real estate: | Originated Loans                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Recorded Investment 320,000 531,000 320,000 531,000              
Consumer non-real estate: | Originated Loans | Purchased indirect paper                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans 49,221,000 $ 39,705,000 49,221,000 $ 39,705,000              
Consumer non-real estate: | Originated Loans | Purchased indirect paper | Substandard                      
Loans allowance for loan losses and impaired loans (Textual) [Abstract]                      
Gross loans $ 0   $ 0