NATURE OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Detail textuals) - USD ($)
shares in Millions |
12 Months Ended |
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Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2008 |
Dec. 31, 2004 |
| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Material loans criteria for ALLL adequacy calculation |
$ 250,000
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| Weighted average repo rate |
0.08%
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| Average balance of Repo |
$ 6,100,000
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| Antidilutive options excluded from calculation of diluted earnings per common share |
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0.2
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| Stock Options |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Method used to estimate the fair value of stock options |
Black-Scholes model
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| Goodwill |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Carrying amount of goodwill |
$ 66,700,000
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$ 800,000
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| Core deposits |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Net book value core deposit intangible |
$ 17,101,000
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3,031,000
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| Amortized period of core deposit intangible |
10 years
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| Customer list intangibles |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Net book value core deposit intangible |
$ 4,094,000
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| Amortized period of core deposit intangible |
12 years
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| Brookfield investment partners LLC |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Ownership percentage purchased by company |
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100.00%
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| Carrying amount of goodwill |
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$ 800,000
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| Baylake Corp | Goodwill |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Goodwill related to the Baylake merger |
$ 65,500,000
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| Financial Advisor | Goodwill |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Additions to carrying amount related to acquisition |
$ 400,000
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| Nicolet Joint Ventures, LLC (the "JV") |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Ownership percentage |
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50.00%
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| Nicolet national bank |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Ownership percentage |
100.00%
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| United Financial Services Llc | Baylake Corp |
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| Nature Of Business And Significant Accounting Policies [Line Items] |
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| Percentage of indirect interest |
49.80%
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| Ownership percentage purchased by company |
99.20%
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| Equity income recognized in business acquisition |
$ 1,000,000
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| Payment made for acquisition |
1,600,000
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$ 900,000
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| Loan amount |
200,000
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| Carrying value of bank investment |
$ 8,300,000
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