Shareholders' Equity	12 Months Ended
Dec. 31, 2017
Equity [Abstract]
Shareholders' Equity	SHAREHOLDERS’ EQUITY Common Stock During 2017, Customers Bancorp did not issue any shares of its common stock pursuant to public offerings. During 2016, Customers Bancorp issued shares of its common stock pursuant to the following public offerings: On November 9, 2016, Customers Bancorp issued 2,415,000 shares of common stock at a price to the public of $25.00 per share as part of an underwritten public offering. Customers received proceeds of $58.3 million from the offering, after deducting offering costs. On August 11, 2016, Customers Bancorp entered into an At Market Issuance Sales Agreement ("the Sales Agreement") with FBR Capital Markets & Co., Keefe, Bruyette & Woods, Inc. and Maxim Group LLC. Customers Bancorp has authorized the sale, at its discretion, of shares of its common stock, in an aggregate offering amount up to $50 million under the Sales Agreement. Customers issued 219,386 shares in connection with this Sales Agreement during 2016 receiving proceeds of $5.5 million, net of offering costs. The net proceeds from the common stock offerings was used for general corporate purposes, which included working capital and the funding of organic growth at Customers Bank. In November 2013, Customers Bancorp announced that its Board of Directors had authorized a stock repurchase plan in which it could acquire up to 5% of its current outstanding shares at prices not to exceed a 20% premium over the current book value. The repurchase program may be suspended, modified or discontinued at any time, and the Bancorp has no obligation to repurchase any amount of its common stock under the program. There was no stock repurchased during 2017, 2016 or 2015. At December 31, 2017, there were 35,187 warrants outstanding to purchase shares of Customers Bancorp’s common stock at a price of $21.38 per share. At December 31, 2016, there were warrants outstanding to purchase 184,706 shares of Customers Bancorp’s common stock. The purchase prices at December 31, 2016, ranged from $9.55 per share to $73.01 per share, with warrants at the latter purchase price having expired on December 31, 2017. Preferred Stock Customers Bancorp currently has four series of preferred stock outstanding. During 2017, Customers Bancorp did not issue any preferred stock. Preferred stock issued during 2016 included the following: On September 16, 2016, Customers Bancorp issued 3,400,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, (the “Series F Preferred Stock”) par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series F Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.00% from the original issue date to, but excluding, December 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 4.762% per annum. Customers received proceeds of $82.2 million from the offering, after deducting offering costs. On April 28, 2016, Customers Bancorp issued 2,300,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, (the “Series E Preferred Stock”) par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series E Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.45% from the original issue date to, but excluding, June 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.14% per annum. Customers received proceeds of $55.6 million from the offering, after deducting offering costs. On January 29, 2016, Customers Bancorp issued 1,000,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, (the "Series D Preferred Stock") par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series D Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.50% from the original issue date to, but excluding, March 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.09% per annum. Customers received proceeds of $24.1 million from the offering, after deducting offering costs. Preferred stock issued during 2015 included the following: On May 18, 2015, Customers Bancorp issued 2,300,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, (the "Series C Preferred Stock") par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series C Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 7.00% from the original issue date to, but excluding, June 15, 2020, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.30% per annum. Customers received proceeds of $55.6 million from the offering, after deducting offering costs. The net proceeds from the preferred stock offerings were used for general corporate purposes, which included working capital and the funding of organic growth at Customers Bank. Dividends on the Series C, Series D, Series E and Series F Preferred Stock are not cumulative. If Customers Bancorp's board of directors or a duly authorized committee of the board does not declare a dividend on the Series C, Series D, Series E and Series F Preferred Stock in respect of a dividend period, then no dividend shall be deemed to have accrued for such dividend period, be payable on the applicable dividend payment date, or be cumulative, and Customers Bancorp will have no obligation to pay any dividend for that dividend period, whether or not the board of directors or a duly authorized committee of the board declares a dividend on the Series C, Series D, Series E, and Series F Preferred Stock for any future dividend period. The Series C, Series D, Series E and Series F Preferred Stock have no stated maturity, are not subject to any mandatory redemption, sinking fund or other similar provisions and will remain outstanding unless redeemed at Customers Bancorp's option. Customers Bancorp may redeem the Series C, Series D, Series E and Series F Preferred Stock at its option, at a redemption price equal to $25.00 per share, plus any declared and unpaid dividends (without regard to any undeclared dividends), (i) in whole or in part, from time to time, on any dividend payment date on or after June 15, 2020, for the Series C Preferred Stock, March 15, 2021, for the Series D Preferred Stock, June 15, 2021, for the Series E Preferred Stock and December 15, 2021, for the Series F Preferred Stock and or (ii) in whole but not in part, within 90 days following the occurrence of a regulatory capital treatment event. Any redemption of the Series C, Series D, Series E and Series F Preferred Stock is subject to prior approval of the Board of Governors of the Federal Reserve System. The Series C, Series D, Series E and Series F Preferred Stock qualify as Tier 1 capital under regulatory capital guidelines. Except in limited circumstances, the Series C, Series D, Series E and Series F Preferred Stock do not have any voting rights. Preferred stock dividends paid during 2017 included the following: On December 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of November 30, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On September 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of August 31, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On June 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of May 31, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share and • a cash dividend on its Series F Preferred Stock of $0.375 per share. On March 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of February 28, 2017: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share and • a cash dividend on its Series F Preferred Stock of $0.375 per share. Preferred stock dividends paid during 2016 included the following: On December 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of November 30, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share and • a cash dividend on its Series F Preferred Stock of $0.370833 per share. On September 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of August 31, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share; • a cash dividend on its Series E Preferred Stock of $0.403125 per share and On June 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of May 31, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share; • a cash dividend on its Series D Preferred Stock of $0.40625 per share and • a cash dividend on its Series E Preferred Stock of $0.210521 per share. On March 15, 2016, Customers made the following dividend payments to preferred shareholders of record as of February 29, 2016: • a cash dividend on its Series C Preferred Stock of $0.4375 per share and • a cash dividend on its Series D Preferred Stock of $0.2076 per share.

SHAREHOLDERS’ EQUITY

Common Stock

During 2017, Customers Bancorp did not issue any shares of its common stock pursuant to public offerings.

During 2016, Customers Bancorp issued shares of its common stock pursuant to the following public offerings:

On November 9, 2016, Customers Bancorp issued 2,415,000 shares of common stock at a price to the public of $25.00 per share as part of an underwritten public offering. Customers received proceeds of $58.3 million from the offering, after deducting offering costs.

On August 11, 2016, Customers Bancorp entered into an At Market Issuance Sales Agreement ("the Sales Agreement") with FBR Capital Markets & Co., Keefe, Bruyette & Woods, Inc. and Maxim Group LLC. Customers Bancorp has authorized the sale, at its discretion, of shares of its common stock, in an aggregate offering amount up to $50 million under the Sales Agreement. Customers issued 219,386 shares in connection with this Sales Agreement during 2016 receiving proceeds of $5.5 million, net of offering costs.

The net proceeds from the common stock offerings was used for general corporate purposes, which included working capital and the funding of organic growth at Customers Bank.

In November 2013, Customers Bancorp announced that its Board of Directors had authorized a stock repurchase plan in which it could acquire up to 5% of its current outstanding shares at prices not to exceed a 20% premium over the current book value. The repurchase program may be suspended, modified or discontinued at any time, and the Bancorp has no obligation to repurchase any amount of its common stock under the program. There was no stock repurchased during 2017, 2016 or 2015.

At December 31, 2017, there were 35,187 warrants outstanding to purchase shares of Customers Bancorp’s common stock at a price of $21.38 per share. At December 31, 2016, there were warrants outstanding to purchase 184,706 shares of Customers Bancorp’s common stock. The purchase prices at December 31, 2016, ranged from $9.55 per share to $73.01 per share, with warrants at the latter purchase price having expired on December 31, 2017.

Preferred Stock

Customers Bancorp currently has four series of preferred stock outstanding.

During 2017, Customers Bancorp did not issue any preferred stock.

Preferred stock issued during 2016 included the following:

On September 16, 2016, Customers Bancorp issued 3,400,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series F, (the “Series F Preferred Stock”) par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series F Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.00% from the original issue date to, but excluding, December 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 4.762% per annum. Customers received proceeds of $82.2 million from the offering, after deducting offering costs.

On April 28, 2016, Customers Bancorp issued 2,300,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series E, (the “Series E Preferred Stock”) par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series E Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.45% from the original issue date to, but excluding, June 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.14% per annum. Customers received proceeds of $55.6 million from the offering, after deducting offering costs.

On January 29, 2016, Customers Bancorp issued 1,000,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D, (the "Series D Preferred Stock") par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series D Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 6.50% from the original issue date to, but excluding, March 15, 2021, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.09% per annum. Customers received proceeds of $24.1 million from the offering, after deducting offering costs.

Preferred stock issued during 2015 included the following:

On May 18, 2015, Customers Bancorp issued 2,300,000 shares of Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series C, (the "Series C Preferred Stock") par value $1.00 per share, at a price of $25.00 per share in a public offering. Dividends on the Series C Preferred Stock accrue and are payable quarterly in arrears, at a fixed rate per annum equal to 7.00% from the original issue date to, but excluding, June 15, 2020, and thereafter at a floating rate per annum equal to three-month LIBOR on the related dividend determination date plus a spread of 5.30% per annum. Customers received proceeds of $55.6 million from the offering, after deducting offering costs.

The net proceeds from the preferred stock offerings were used for general corporate purposes, which included working capital and the funding of organic growth at Customers Bank.

Dividends on the Series C, Series D, Series E and Series F Preferred Stock are not cumulative. If Customers Bancorp's board of directors or a duly authorized committee of the board does not declare a dividend on the Series C, Series D, Series E and Series F Preferred Stock in respect of a dividend period, then no dividend shall be deemed to have accrued for such dividend period, be payable on the applicable dividend payment date, or be cumulative, and Customers Bancorp will have no obligation to pay any dividend for that dividend period, whether or not the board of directors or a duly authorized committee of the board declares a dividend on the Series C, Series D, Series E, and Series F Preferred Stock for any future dividend period.

The Series C, Series D, Series E and Series F Preferred Stock have no stated maturity, are not subject to any mandatory redemption, sinking fund or other similar provisions and will remain outstanding unless redeemed at Customers Bancorp's option. Customers Bancorp may redeem the Series C, Series D, Series E and Series F Preferred Stock at its option, at a redemption price equal to $25.00 per share, plus any declared and unpaid dividends (without regard to any undeclared dividends), (i) in whole or in part, from time to time, on any dividend payment date on or after June 15, 2020, for the Series C Preferred Stock, March 15, 2021, for the Series D Preferred Stock, June 15, 2021, for the Series E Preferred Stock and December 15, 2021, for the Series F Preferred Stock and or (ii) in whole but not in part, within 90 days following the occurrence of a regulatory capital treatment event. Any redemption of the Series C, Series D, Series E and Series F Preferred Stock is subject to prior approval of the Board of Governors of the Federal Reserve System. The Series C, Series D, Series E and Series F Preferred Stock qualify as Tier 1 capital under regulatory capital guidelines. Except in limited circumstances, the Series C, Series D, Series E and Series F Preferred Stock do not have any voting rights.

Preferred stock dividends paid during 2017 included the following:

On December 15, 2017, Customers made the following dividend payments to preferred shareholders of record as of November 30, 2017: