Description of the Business	12 Months Ended
Description of the Business	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Business	DESCRIPTION OF THE BUSINESS Customers Bancorp, Inc. ("Customers Bancorp") is a bank holding company engaged in banking activities through its wholly owned subsidiary, Customers Bank ("the Bank"), collectively referred to as “Customers” herein. Customers Bancorp and its wholly owned subsidiaries, the Bank, and non-bank subsidiaries, serve residents and businesses in Southeastern Pennsylvania (Bucks, Berks, Chester, Philadelphia and Delaware Counties); Harrisburg, Pennsylvania (Dauphin County); Rye Brook, New York (Westchester County); Hamilton, New Jersey (Mercer County); Boston, Massachusetts; Providence, Rhode Island; Portsmouth, New Hampshire (Rockingham County); Manhattan and Melville, New York; Washington, D.C.; Chicago, Illinois; Dallas, Texas; Orlando, Florida; Wilmington, North Carolina; and nationally for certain loan and deposit products. The Bank has 12 full-service branches and provides commercial banking products, primarily loans and deposits. In addition, Customers Bank also administratively supports loan and other financial products, including equipment finance leases, to customers through its limited-purpose offices in Boston, Massachusetts; Providence, Rhode Island; Portsmouth, New Hampshire; Manhattan and Melville, New York; Philadelphia and Lancaster, Pennsylvania; Chicago, Illinois; Dallas, Texas; Orlando, Florida; Wilmington, North Carolina; and other locations. The Bank also serves specialty niche businesses nationwide, including its commercial loans to mortgage banking businesses, commercial equipment financing, SBA lending, specialty lending and consumer loans through relationships with fintech companies. On January 4, 2021, Customers Bancorp completed the previously announced divestiture of BankMobile Technologies, Inc. ("BMT"), the technology arm of its BankMobile segment, to MFAC Merger Sub Inc., an indirect wholly-owned subsidiary of Megalith Financial Acquisition Corp. ("MFAC"), pursuant to an Agreement and Plan of Merger, dated August 6, 2020, by and among MFAC, MFAC Merger Sub Inc., BMT, Customers Bank, the sole stockholder of BMT, and Customers Bancorp, the parent bank holding company of Customers Bank (as amended on November 2, 2020 and December 8, 2020). Following the completion of the divestiture of BMT, BankMobile's serviced deposits and loans and the related net interest income have been combined with Customers’ financial condition and the results of operations as a single reportable segment. BMT's historical financial results for periods prior to the divestiture are reflected in Customers’ consolidated financial statements as discontinued operations. The assets and liabilities of BMT have been presented as "Assets of discontinued operations" and "Liabilities of discontinued operations" on the consolidated balance sheet at December 31, 2020. BMT's operating results and associated cash flows have been presented as "Discontinued operations" within the accompanying consolidated financial statements and prior period amounts have been reclassified to conform with the current period presentation. See NOTE 3 – DISCONTINUED OPERATIONS for additional information. The Bank is subject to regulation of the Pennsylvania Department of Banking and Securities and the Federal Reserve Bank and is periodically examined by those regulatory authorities. Customers Bancorp has made certain equity investments through its wholly owned subsidiaries CB Green Ventures Pte Ltd. and CUBI India Ventures Pte Ltd., which were sold in June 2021. Refer to NOTE 6 – INVESTMENT SECURITIES for additional information.