Subsequent Events

6 Months Ended

Mar. 31, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

The Company has evaluated events subsequent to March 31, 2018 and through the financial statement issuance date of May 14, 2018. On April 19, 2018, the Company completed its minority stock offering, after receiving all regulatory approvals with trading commencing on the Nasdaq Global Select Market on April 20, 2018. In connection with the closing, the Company issued 62,580,155 shares of its common stock to the MHC, the Company's mutual holding company, 3,476,675 shares to the Columbia Bank Foundation, the Bank's charitable foundation, and 49,832,345 shares to depositors of the Bank who subscribed for and were allocated shares in the minority stock offering, as well as the Columbia Bank Employee Stock Ownership Plan.