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Condensed Financial Statements of Parent Company - Summary of Condensed Income Statements of Parent Company (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Operating expense: |  |  |  |  |  |  |  |  |  |  |
Interest | $ 29,319 | $ 30,266 | $ 25,246 | $ 20,676 | $ 19,481 | $ 19,627 | $ 18,163 | $ 15,771 | $ 105,507 | $ 73,042 | $ 53,560
Income tax benefit | (10,806) | (14,899) | (12,327) | (7,009) | (9,320) | (14,558) | (12,963) | (9,052) | (45,042) | (45,893) | (29,912)
Net income |  |  |  |  |  |  |  |  | 78,837 | 78,702 | 58,583
Preferred stock dividends | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 2,552 | 2,062 | 1,286 | 14,459 | 9,515 | 2,493
Net income available to common shareholders | $ 18,000 | $ 4,139 | $ 20,107 | $ 22,132 | $ 16,213 | $ 18,655 | $ 17,421 | $ 16,898 | 64,378 | 69,187 | 56,090
Comprehensive income |  |  |  |  |  |  |  |  | 83,370 | 81,794 | 50,721
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Operating income: |  |  |  |  |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  | 38,200 | 25,400 | 18,545
Total operating income |  |  |  |  |  |  |  |  | 38,200 | 25,400 | 18,545
Operating expense: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 7,984 | 5,854 | 5,854
Other |  |  |  |  |  |  |  |  | 1,742 | 4,570 | 4,604
Total operating expense |  |  |  |  |  |  |  |  | 9,726 | 10,424 | 10,458
Income before taxes and undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 28,474 | 14,976 | 8,087
Income tax benefit |  |  |  |  |  |  |  |  | 3,620 | 3,961 | 3,516
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 32,094 | 18,937 | 11,603
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 46,743 | 59,765 | 46,980
Net income |  |  |  |  |  |  |  |  | 78,837 | 78,702 | 58,583
Preferred stock dividends |  |  |  |  |  |  |  |  | 14,459 | 9,515 | 2,493
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ 64,378 | $ 69,187 | $ 56,090

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