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Selected Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 169,436 | $ 171,826 | $ 167,582 | $ 162,622 | $ 157,152 | $ 155,072 | $ 149,079 | $ 145,780 | $ 671,466 | $ 607,083 | $ 548,918
Interest expense | 49,264 | 50,160 | 47,512 | 43,470 | 37,901 | 35,220 | 31,778 | 30,045 | 190,406 | 134,944 | 116,992
Net interest income | 120,172 | 121,666 | 120,070 | 119,152 | 119,251 | 119,852 | 117,301 | 115,735 | 481,060 | 472,139 | 431,926
Provision (release) for loan losses | (1,900) | 0 | 750 | (500) | (5,500) | 1,000 | (950) | 0 | (1,650) | (5,450) | (2,100)
Other operating income (including REO gain (loss), net) | 15,786 | 14,395 | 13,618 | 19,329 | 12,207 | 12,619 | 12,309 | 6,841 |  |  |
Other operating expense | 72,526 | 70,898 | 67,967 | 71,672 | 69,617 | 66,977 | 65,787 | 61,941 | 283,063 | 264,322 | 231,519
Income before income taxes | 65,332 | 65,163 | 64,971 | 67,309 | 67,341 | 64,494 | 64,773 | 60,635 | 262,775 | 257,243 | 256,216
Income tax expense | 12,970 | 11,309 | 13,873 | 14,367 | 15,826 | 13,100 | 15,502 | 8,965 | 52,519 | 53,393 | 82,684
Net income | $ 52,362 | $ 53,854 | $ 51,098 | $ 52,942 | $ 51,515 | $ 51,394 | $ 49,271 | $ 51,670 | $ 210,256 | $ 203,850 | $ 173,532
Basic earnings per share (in dollars per share) | $ 0.66 | $ 0.67 | $ 0.63 | $ 0.65 | $ 0.62 | $ 0.61 | $ 0.58 | $ 0.59 | $ 2.61 | $ 2.40 | $ 1.95
Diluted earnings per share (in dollars per share) | 0.66 | 0.67 | 0.63 | 0.65 | 0.62 | 0.61 | 0.57 | 0.59 | 2.61 | 2.40 | 1.94
Cash dividends per share (in dollars per share) | $ 0.21 | $ 0.20 | $ 0.20 | $ 0.18 | $ 0.18 | $ 0.17 | $ 0.17 | $ 0.15 | $ 0.79 | $ 0.67 | $ 0.84

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