Other Assets and Other Liabilities Held for Sale	9 Months Ended
	Sep. 30, 2022
Discontinued Operations and Disposal Groups [Abstract]
Other Assets and Other Liabilities Held for Sale	Other Assets and Other Liabilities Held for SaleOn September 7, 2021, Nicolet entered into a Purchase and Assumption Agreement (the “Birmingham Agreement”) with Bank of Ann Arbor to sell Nicolet’s Birmingham, Michigan branch, including legacy mBank’s asset-based lending team (the “Birmingham Sale”). Pursuant to the terms of the Birmingham Agreement, Bank of Ann Arbor agreed to assume certain deposit liabilities and to acquire certain loans, as well as cash, personal property and other fixed assets associated with the Birmingham branch. The combined loan and deposit balances of the Birmingham branch (excluding certain loans and deposits not subject to the Birmingham Agreement) were approximately $199 million and $51 million, respectively, as of December 31, 2021. The Birmingham Sale closed on January 21, 2022.