Basis of Financial Statement Presentation	3 Months Ended
Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Financial Statement Presentation	Note 1 – Basis of Financial Statement Presentation The accompanying consolidated financial statements of Ben Franklin Financial, Inc. (the “Company”) and its wholly owned subsidiary Ben Franklin Bank of Illinois (the “Bank”) have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with SEC rules and regulations. Accordingly, the statements do not include all the information and footnotes required by GAAP for complete financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto that were included in the Company’s Annual Report for the year ended December 31, 2014. All significant intercompany transactions are eliminated in consolidation. In the opinion of the Company’s management, all adjustments necessary (i) for a fair presentation of the financial statements for the interim periods included herein and (ii) to make such financial statements not misleading have been made and are of a normal and recurring nature. Interim results are not necessarily indicative of results for a full year. In preparing the financial statements, management is required to make estimates and assumptions that affect the recorded 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 for the period. Actual results could differ from those estimates. For further information with respect to significant accounting policies followed by the Company in preparation of the financial statements, refer to the Company’s 2014 Annual Report. The Bank is a federally chartered stock savings bank and a member of the Federal Home Loan Bank (“FHLB”) system. The Bank maintains insurance on deposit accounts with the Deposit Insurance Fund (“DIF”) of the Federal Deposit Insurance Corporation (“FDIC”). On September 12, 2014, Ben Franklin Financial filed a Registration Statement on Form S-1 with the Securities and Exchange Commission in connection with the mutual to stock conversion of Ben Franklin Financial, MHC and the related offering of common stock by Ben Franklin Financial, Inc. The Registration Statement (File No. 333-198702) was declared effective by the Securities and Exchange Commission on November 12, 2014. Ben Franklin Financial, Inc. registered 998,488 shares of common stock, par value $0.01 per share, pursuant to the Registration Statement. The stock offering commenced on November 21, 2014, and ended on January 8, 2015. The stock offering closed January 22, 2015 and resulted in gross proceeds of $3.9 million, through the sale of 390,474 shares of common stock at a price of $10.00 per share. Expenses related to the offering were approximately $1.4 million. Net proceeds of the offering were approximately $2.5 million. As part of the conversion, the MHC’s ownership interest of the Company was offered for sale in a public offering. The existing publicly held shares of the Company, were exchanged for 0.3562 new shares of common stock of Ben Franklin Financial. The exchange ratio ensured that immediately after the conversion and public offering, the public shareholders of Company owned the same aggregate percentage of Ben Franklin Financial common stock that they owned immediately prior to that time (excluding shares purchased in the stock offering and cash received in lieu of fractional shares). When the conversion and public offering was completed, Ben Franklin Financial became the holding company of Ben Franklin Bank of Illinois and succeeded to all of the business and operations of the Company and each of the Company and the MHC ceased to exist. The financial statements do not include the transactions and balances of the MHC. Ben Franklin Financial, Inc. contributed $2.0 million of the net proceeds of the offering to the Bank. In addition, $273,330 of the net proceeds were used to fund the loan to the employee stock ownership plan and approximately $314,000 of the net proceeds were retained by Ben Franklin Financial, Inc. The net proceeds contributed to the Bank have been invested in interest earning deposits and investment securities, and are expected to be used for funding future loan growth. The net proceeds retained by Ben Franklin Financial, Inc. were deposited with the Bank.

Note 1 – Basis of Financial Statement Presentation

The accompanying consolidated financial statements of Ben Franklin Financial, Inc. (the “Company”) and its wholly owned subsidiary Ben Franklin Bank of Illinois (the “Bank”) have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and in accordance with SEC rules and regulations. Accordingly, the statements do not include all the information and footnotes required by GAAP for complete financial statements. These interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto that were included in the Company’s Annual Report for the year ended December 31, 2014. All significant intercompany transactions are eliminated in consolidation. In the opinion of the Company’s management, all adjustments necessary (i) for a fair presentation of the financial statements for the interim periods included herein and (ii) to make such financial statements not misleading have been made and are of a normal and recurring nature. Interim results are not necessarily indicative of results for a full year.

In preparing the financial statements, management is required to make estimates and assumptions that affect the recorded 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 for the period. Actual results could differ from those estimates. For further information with respect to significant accounting policies followed by the Company in preparation of the financial statements, refer to the Company’s 2014 Annual Report.

The Bank is a federally chartered stock savings bank and a member of the Federal Home Loan Bank (“FHLB”) system. The Bank maintains insurance on deposit accounts with the Deposit Insurance Fund (“DIF”) of the Federal Deposit Insurance Corporation (“FDIC”).

On September 12, 2014, Ben Franklin Financial filed a Registration Statement on Form S-1 with the Securities and Exchange Commission in connection with the mutual to stock conversion of Ben Franklin Financial, MHC and the related offering of common stock by Ben Franklin Financial, Inc. The Registration Statement (File No. 333-198702) was declared effective by the Securities and Exchange Commission on November 12, 2014. Ben Franklin Financial, Inc. registered 998,488 shares of common stock, par value $0.01 per share, pursuant to the Registration Statement. The stock offering commenced on November 21, 2014, and ended on January 8, 2015.

The stock offering closed January 22, 2015 and resulted in gross proceeds of $3.9 million, through the sale of 390,474 shares of common stock at a price of $10.00 per share. Expenses related to the offering were approximately $1.4 million. Net proceeds of the offering were approximately $2.5 million.

As part of the conversion, the MHC’s ownership interest of the Company was offered for sale in a public offering. The existing publicly held shares of the Company, were exchanged for 0.3562 new shares of common stock of Ben Franklin Financial. The exchange ratio ensured that immediately after the conversion and public offering, the public shareholders of Company owned the same aggregate percentage of Ben Franklin Financial common stock that they owned immediately prior to that time (excluding shares purchased in the stock offering and cash received in lieu of fractional shares). When the conversion and public offering was completed, Ben Franklin Financial became the holding company of Ben Franklin Bank of Illinois and succeeded to all of the business and operations of the Company and each of the Company and the MHC ceased to exist. The financial statements do not include the transactions and balances of the MHC.

Ben Franklin Financial, Inc. contributed $2.0 million of the net proceeds of the offering to the Bank. In addition, $273,330 of the net proceeds were used to fund the loan to the employee stock ownership plan and approximately $314,000 of the net proceeds were retained by Ben Franklin Financial, Inc. The net proceeds contributed to the Bank have been invested in interest earning deposits and investment securities, and are expected to be used for funding future loan growth. The net proceeds retained by Ben Franklin Financial, Inc. were deposited with the Bank.