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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Interest income | $ 134,380 | $ 145,384 | $ 154,581 | $ 155,926 | $ 158,975 | $ 161,531 | $ 158,539 | $ 165,590 |  |  |
Interest expense | 42,209 | 48,849 | 49,979 | 52,212 | 54,457 | 55,399 | 56,984 | 60,856 | 193,249 | 227,696 | 269,101
Interest and dividend income, operating | 92,171 | 96,535 | 104,602 | 103,714 | 104,518 | 106,132 | 101,555 | 104,734 | 590,271 | 644,635 | 663,560
Provision for loan losses | 5,379 | 10,366 | 18,000 | 11,210 | 15,354 | 21,000 | 30,750 | 26,000 | 44,955 | 93,104 | 179,909
Other operating income (REO expense) | 4,439 | 4,736 | 3,446 | (5,923) | (6,962) | (3,894) | 2,866 | (6,127) |  |  |
Other operating expense | 35,713 | 35,964 | 36,812 | 34,365 | 34,285 | 34,174 | 33,321 | 34,279 | 34,631 | 29,496 | 28,830
Total Income | 55,518 | 54,941 | 53,236 | 52,216 | 47,917 | 47,064 | 40,350 | 38,328 | 215,911 | 173,659 | 123,025
Income taxes | 19,987 | 19,778 | 19,165 | 18,798 | 17,251 | 16,943 | 14,526 | 13,798 | 77,728 | 62,518 | 4,372
NET INCOME | $ 35,531 | $ 35,163 | $ 34,071 | $ 33,418 | $ 30,666 | $ 30,121 | $ 25,824 | $ 24,530 | $ 138,183 | $ 111,141 | $ 118,653
Basic earnings per share (in dollars per share) | $ 0.33 | $ 0.33 | $ 0.32 | $ 0.31 | $ 0.28 | $ 0.27 | $ 0.23 | $ 0.22 | $ 1.29 | $ 1.00 | $ 1.06
Diluted earnings per share (in dollars per share) | $ 0.33 | $ 0.33 | $ 0.32 | $ 0.31 | $ 0.28 | $ 0.27 | $ 0.23 | $ 0.22 | $ 1.29 | $ 1.00 | $ 1.05
Cash dividends per share (in dollars per share) | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.08 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.32 | $ 0.24 | $ 0.20
Return of average assets | 1.10% | 1.04% | 1.00% | 0.98% | 0.91% | 0.90% | 0.77% | 0.73% |  |  |

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