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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%