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Condensed Financial Statements of Parent Company - Summary of Condensed Balance Sheets of Parent Company (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
ASSETS |  |  |  |
Cash in subsidiary bank | $ 146,323 | $ 264,709 | $ 264,593 | $ 371,023
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Other borrowings | 186,497 | 87,123 |  |
Total liabilities | 8,918,591 | 8,526,864 |  |
Shareholders’ equity | 920,964 | 855,872 | 553,902 | 443,145
Total liabilities and shareholders’ equity | 9,839,555 | 9,382,736 |  |
Customers Bancorp |  |  |  |
ASSETS |  |  |  |
Cash in subsidiary bank | 67,231 | 54,441 | $ 54,567 | $ 16,465
Investments in and receivables due from subsidiaries | 1,039,883 | 883,793 |  |
Other assets | 3,160 | 10,784 |  |
Total assets | 1,110,274 | 949,018 |  |
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |
Other borrowings | 186,497 | 87,123 |  |
Other liabilities | 2,813 | 6,023 |  |
Total liabilities | 189,310 | 93,146 |  |
Shareholders’ equity | 920,964 | 855,872 |  |
Total liabilities and shareholders’ equity | $ 1,110,274 | $ 949,018 |  |

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