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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, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Interest income $ 130,302 $ 128,176 $ 126,505 $ 131,309 $ 134,380 $ 145,384 $ 154,581 $ 155,926      
Interest expense 33,343 33,461 33,482 35,875 42,209 48,849 49,979 52,212 136,159 193,249 227,696
Interest income 96,959 94,715 93,023 95,434 92,171 96,535 104,602 103,714 516,291 590,271 644,635
Provision for loan losses (2,250) 0 0 3,600 5,379 10,366 18,000 11,210 1,350 44,955 93,104
Other operating income (REO expense) 11,157 5,236 2,043 1,638 4,439 4,736 3,446 (5,923)      
Other operating expense 43,167 41,610 41,164 38,298 35,713 35,964 36,812 34,365 45,037 34,631 29,496
Total Income 67,199 58,341 53,902 55,174 55,518 54,941 53,236 52,216 234,616 215,911 173,659
Income taxes 24,293 21,003 17,924 19,891 19,987 19,778 19,165 18,798 83,111 77,728 62,518
NET INCOME $ 42,906 $ 37,338 $ 35,978 $ 35,283 $ 35,531 $ 35,163 $ 34,071 $ 33,418 $ 151,505 $ 138,183 $ 111,141
Basic earnings per share (in dollars per share) $ 0.42 $ 0.36 $ 0.34 $ 0.33 $ 0.33 $ 0.33 $ 0.32 $ 0.31 $ 1.45 $ 1.29 $ 1.00
Diluted earnings per share (in dollars per share) $ 0.41 $ 0.36 $ 0.34 $ 0.33 $ 0.33 $ 0.33 $ 0.32 $ 0.31 $ 1.45 $ 1.29 $ 1.00
Cash dividends per share (in dollars per share) $ 0.1 $ 0.09 $ 0.09 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.08 $ 0.36 $ 0.32 $ 0.24
Return of average assets 1.32% 1.15% 1.10% 1.11% 1.10% 1.04% 1.00% 0.98%