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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Operating expense: |  |  |  |  |  |  |  |  |  |  |
Interest | $ 41,779 | $ 46,044 | $ 40,317 | $ 31,933 | $ 29,319 | $ 30,266 | $ 25,246 | $ 20,676 | $ 160,074 | $ 105,507 | $ 73,042
Income tax benefit | (5,109) | (28) | (6,820) | (7,402) | (10,806) | (14,899) | (12,327) | (7,009) | (19,359) | (45,042) | (45,893)
Net income | 17,862 | 6,029 | 23,663 | 24,142 | 21,615 | 7,754 | 23,722 | 25,747 | 71,695 | 78,837 | 78,702
Preferred stock dividends | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 3,615 | 14,459 | 14,459 | 9,515
Net income available to common shareholders | $ 14,247 | $ 2,414 | $ 20,048 | $ 20,527 | $ 18,000 | $ 4,139 | $ 20,107 | $ 22,132 | 57,236 | 64,378 | 69,187
Comprehensive income |  |  |  |  |  |  |  |  | 50,730 | 83,370 | 81,794
Customers Bancorp |  |  |  |  |  |  |  |  |  |  |
Operating income: |  |  |  |  |  |  |  |  |  |  |
Other, including dividends from Bank |  |  |  |  |  |  |  |  | 45,422 | 38,200 | 25,400
Total operating income |  |  |  |  |  |  |  |  | 45,422 | 38,200 | 25,400
Operating expense: |  |  |  |  |  |  |  |  |  |  |
Interest |  |  |  |  |  |  |  |  | 8,178 | 7,984 | 5,854
Other |  |  |  |  |  |  |  |  | 1,722 | 1,742 | 4,570
Total operating expense |  |  |  |  |  |  |  |  | 9,900 | 9,726 | 10,424
Income before taxes and undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 35,522 | 28,474 | 14,976
Income tax benefit |  |  |  |  |  |  |  |  | 2,335 | 3,620 | 3,961
Income before undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 37,857 | 32,094 | 18,937
Equity in undistributed income of subsidiaries |  |  |  |  |  |  |  |  | 33,838 | 46,743 | 59,765
Net income |  |  |  |  |  |  |  |  | 71,695 | 78,837 | 78,702
Preferred stock dividends |  |  |  |  |  |  |  |  | 14,459 | 14,459 | 9,515
Net income available to common shareholders |  |  |  |  |  |  |  |  | $ 57,236 | $ 64,378 | $ 69,187

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