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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 | 15 Months Ended
--- | --- | --- | ---
Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2009 | Dec. 31, 2010
Interest income | $ 158,975 | $ 161,531 | $ 158,539 | $ 165,590 | $ 165,485 | $ 167,371 | $ 165,034 |  |  |  | $ 165,670
Interest expense | 54,457 | 55,399 | 56,984 | 60,856 | 65,116 | 68,086 | 67,994 | 227,696 | 269,101 | 318,627 | 67,905
Net interest income | 104,518 | 106,132 | 101,555 | 104,734 | 100,369 | 99,285 | 97,040 | 644,635 | 663,560 | 691,774 | 97,765
Provision for loan losses | 15,354 | 21,000 | 30,750 | 26,000 | 26,000 | 20,736 | 63,423 | 93,104 | 179,909 | 193,000 | 69,750
Other operating income (REO expense) | (6,962) | (3,894) | 2,866 | (6,127) |  |  |  |  |  |  |
Other operating income (REO expense) |  |  |  |  | (20,105) | (25,877) | 74,419 | 17,786 | 20,563 | 19,009 | 11,518
Other operating expense | 34,285 | 34,174 | 33,321 | 34,279 | 31,665 | 32,877 | 39,961 | 29,496 | 28,830 | 25,105 | 26,977
Total Income | 47,917 | 47,064 | 40,350 | 38,328 | 22,599 | 19,795 | 68,075 | 173,659 | 123,025 | 75,742 | 12,556
Income taxes | 17,251 | 16,943 | 14,526 | 13,798 | 6,636 | 7,127 | (14,036) | 62,518 | 4,372 | 27,570 | 4,645
Net income | $ 30,666 | $ 30,121 | $ 25,824 | $ 24,530 | $ 15,963 | $ 12,668 | $ 82,111 | $ 111,141 | $ 118,653 | $ 48,172 | $ 7,911
Basic earnings per share | $ 0.28 | $ 0.27 | $ 0.23 | $ 0.22 | $ 0.14 | $ 0.11 | $ 0.73 | $ 1.00 | $ 1.06 | $ 0.46 | $ 0.08
Diluted earnings per share | $ 0.28 | $ 0.27 | $ 0.23 | $ 0.22 | $ 0.14 | $ 0.11 | $ 0.73 | $ 1.00 | $ 1.05 | $ 0.46 | $ 0.07
Cash dividends per share | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.06 | $ 0.05 | $ 0.05 | $ 0.05 | $ 0.24 | $ 0.20 | $ 0.20 | $ 0.05
Return of average assets | 0.91% | 0.90% | 0.77% | 0.73% | 0.47% | 0.37% | 2.44% |  |  |  | 0.25%

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