Plan of Conversion	6 Months Ended
Jun. 30, 2022
Plan Of Conversion Disclosure [Abstract]
Plan of Conversion	NOTE 1 - PLAN OF CONVERSION On March 9, 2022, the Board of Directors of the Bank adopted a Plan of Conversion under which the Bank would convert from a Massachusetts mutual co-operative bank into a Massachusetts stock co-operative bank and become the wholly owned subsidiary of a newly chartered stock holding company, ECB Bancorp, Inc. (the “Holding Company”). The Plan of Conversion received all of the approvals of various regulatory agencies and the Plan of Conversion was approved by the required vote of more than two-thirds of the Bank’s depositors present and voting at a special meeting of depositors held on May 5, 2022. The Bank’s mutual to stock conversion and the Company’s stock offering were consummated on July 27, 2022. In the offering, the Company sold 8,915,247 shares of common stock at a per share price of $10.00 for gross offering proceeds of $89.2 million. Additionally, the Company contributed 260,000 shares to the Everett Co-operative Bank Charitable Foundation (the “Foundation”). The offering costs of issuing the capital stock have been deferred and deducted from the proceeds of the offering. At June 30, 2022 (unaudited) and December 31, 2021, the Bank had incurred approximately $1,965,000 and $76,000, respectively, in offering costs, which are included in other assets on the respective consolidated balance sheets. The Bank has established a Liquidation Account in an amount equal to the net worth of the Bank as of the date of the latest consolidated statement of financial condition contained in the final prospectus distributed in connection with the conversion. The function of the Liquidation Account is to establish a priority on liquidation of the Bank. The Liquidation Account will be maintained by the Bank for the benefit of the eligible account holders who continue to maintain deposit accounts with the Bank following the conversion. Each eligible account holder shall, with respect to each deposit account, hold a related inchoate interest in a portion of the Liquidation Account balance, in relation to each deposit account balance at the eligibility record date, or to such balance as it may be subsequently reduced, as hereinafter provided. The initial Liquidation Account balance shall not be increased, and shall be subject to downward adjustment to the extent of any downward adjustment of any subaccount balance of any eligible account holder in accordance with the regulations of the Division of Banks of the Commonwealth of Massachusetts. In the unlikely event of a complete liquidation of the Bank (and only in such event), following all liquidation payments to creditors (including those to depositors to the extent of their deposit accounts) each eligible account holder shall be entitled to receive a liquidating distribution from the Liquidation Account, in the amount of the then-adjusted subaccount balances for his or her deposit accounts then held, before any liquidating distribution may be made to any holder of the Bank’s capital stock. The Bank may not declare or pay a cash dividend on its outstanding capital stock if the effect thereof would cause its regulatory capital to be reduced below the amount required to maintain the Liquidation Account and under FDIC rules and regulations.

Plan of Conversion

6 Months Ended

Jun. 30, 2022

Plan Of Conversion Disclosure [Abstract]

NOTE 1 - PLAN OF CONVERSION

On March 9, 2022, the Board of Directors of the Bank adopted a Plan of Conversion under which the Bank would convert from a Massachusetts mutual co-operative bank into a Massachusetts stock co-operative bank and become the wholly owned subsidiary of a newly chartered stock holding company, ECB Bancorp, Inc. (the “Holding Company”). The Plan of Conversion received all of the approvals of various regulatory agencies and the Plan of Conversion was approved by the required vote of more than two-thirds of the Bank’s depositors present and voting at a special meeting of depositors held on May 5, 2022. The Bank’s mutual to stock conversion and the Company’s stock offering were consummated on July 27, 2022. In the offering, the Company sold 8,915,247 shares of common stock at a per share price of $10.00 for gross offering proceeds of $89.2 million. Additionally, the Company contributed 260,000 shares to the Everett Co-operative Bank Charitable Foundation (the “Foundation”).

The offering costs of issuing the capital stock have been deferred and deducted from the proceeds of the offering. At June 30, 2022 (unaudited) and December 31, 2021, the Bank had incurred approximately $1,965,000 and $76,000, respectively, in offering costs, which are included in other assets on the respective consolidated balance sheets.

The Bank has established a Liquidation Account in an amount equal to the net worth of the Bank as of the date of the latest consolidated statement of financial condition contained in the final prospectus distributed in connection with the conversion. The function of the Liquidation Account is to establish a priority on liquidation of the Bank. The Liquidation Account will be maintained by the Bank for the benefit of the eligible account holders who continue to maintain deposit accounts with the Bank following the conversion. Each eligible account holder shall, with respect to each deposit account, hold a related inchoate interest in a portion of the Liquidation Account balance, in relation to each deposit account balance at the eligibility record date, or to such balance as it may be subsequently reduced, as hereinafter provided. The initial Liquidation Account balance shall not be increased, and shall be subject to downward adjustment to the extent of any downward adjustment of any subaccount balance of any eligible account holder in accordance with the regulations of the Division of Banks of the Commonwealth of Massachusetts.

In the unlikely event of a complete liquidation of the Bank (and only in such event), following all liquidation payments to creditors (including those to depositors to the extent of their deposit accounts) each eligible account holder shall be entitled to receive a liquidating distribution from the Liquidation Account, in the amount of the then-adjusted subaccount balances for his or her deposit accounts then held, before any liquidating distribution may be made to any holder of the Bank’s capital stock.

The Bank may not declare or pay a cash dividend on its outstanding capital stock if the effect thereof would cause its regulatory capital to be reduced below the amount required to maintain the Liquidation Account and under FDIC rules and regulations.