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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Total Income | $ 142,240 | $ 137,716 | $ 136,198 | $ 132,764 | $ 132,872 | $ 133,735 | $ 135,063 | $ 135,124 | $ 548,918 | $ 536,793 | $ 530,553
Interest expense | 29,808 | 29,101 | 28,471 | 29,612 | 30,056 | 29,495 | 28,738 | 28,255 | 116,992 | 116,544 | 117,072
Net interest income | 112,432 | 108,615 | 107,727 | 103,152 | 102,816 | 104,240 | 106,325 | 106,869 | 431,926 | 420,249 | 413,481
Provision (release) for loan losses | (500) | 0 | (1,600) | 0 | (3,100) | (1,650) | (1,500) | 0 | (2,100) | (6,250) | (11,162)
Other operating income (including REO gain (loss), net) | 16,686 | 13,798 | 10,931 | 12,294 | 14,830 | 15,573 | 14,623 | 12,055 |  |  |
Other operating expense | 62,649 | 57,062 | 57,467 | 54,341 | 55,407 | 56,305 | 59,226 | 64,509 | 231,519 | 235,447 | 224,851
Income before income taxes | 66,969 | 65,351 | 62,791 | 61,105 | 65,339 | 65,158 | 63,222 | 54,415 | 256,216 | 248,134 | 249,519
Income tax expense | 20,865 | 21,239 | 20,721 | 19,859 | 21,115 | 22,154 | 21,499 | 19,317 | 82,684 | 84,085 | 89,203
NET INCOME | $ 46,104 | $ 44,112 | $ 42,070 | $ 41,246 | $ 44,224 | $ 43,004 | $ 41,723 | $ 35,098 | $ 173,532 | $ 164,049 | $ 160,316
Basic earnings per share (in dollars per share) | $ 0.53 | $ 0.49 | $ 0.47 | $ 0.46 | $ 0.49 | $ 0.47 | $ 0.45 | $ 0.38 | $ 1.95 | $ 1.79 | $ 1.68
Diluted earnings per share (in dollars per share) | 0.52 | 0.49 | 0.47 | 0.46 | 0.49 | 0.47 | 0.45 | 0.38 | 1.94 | 1.78 | 1.67
Cash dividends per share (in dollars per share) | $ 0.15 | $ 0.15 | $ 0.40 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.14 | $ 0.13 | $ 0.84 | $ 0.55 | $ 0.54

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