Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Mar. 31, 2018
Accounting Policies [Abstract]
Consolidation, Policy [Policy Text Block]	Principles of Consolidation The consolidated financial statements as of and for the periods ended March 31, 2018 and December 31, 2017, include New Bancorp, Inc. and its wholly-owned subsidiary the New Buffalo Savings Bank “the Bank”, together referred to as the “Company.” Intercompany transactions and balances have been eliminated in consolidation. The conversion to stock form, including the formation of New Bancorp, Inc., was completed on October 19, 2015.
Use of Estimates, Policy [Policy Text Block]	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses, valuation of real estate acquired in connection with foreclosures or in satisfaction of loans, valuation of deferred tax assets and fair values of financial instruments.

New Bancorp, Inc. 10-Q