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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 135,077 | $ 135,011 | $ 132,351 | $ 131,258 | $ 130,302 | $ 126,505 | $ 131,309 | $ 128,176 | $ 533,697 | $ 516,291 | $ 590,271
Interest expense | 31,684 | 31,732 | 31,715 | 32,946 | 33,343 | 33,482 | 35,875 | 33,461 | 128,077 | 136,159 | 193,249
Net interest income | 103,393 | 103,279 | 100,636 | 98,312 | 96,959 | 93,023 | 95,434 | 94,715 | 405,620 | 380,132 | 397,022
Provision (reversal) for loan losses | (3,465) | (3,000) | (4,336) | (4,600) | (2,250) | 0 | 3,600 | 0 | (15,401) | 1,350 | 44,955
Other operating income (REO expense) | 10,808 | 6,016 | 7,255 | 3,837 | 11,157 | 2,043 | 1,638 | 5,236 |  |  |
Noninterest expense | 54,537 | 53,293 | 52,059 | 44,120 | 43,167 | 41,164 | 38,298 | 41,610 | 204,009 | 164,240 | 142,854
Income before income taxes | 63,129 | 59,002 | 60,168 | 62,629 | 67,199 | 53,902 | 55,174 | 58,341 | 244,928 | 234,616 | 215,911
Income taxes | 22,568 | 21,092 | 21,511 | 22,393 | 24,293 | 17,924 | 19,891 | 21,003 | 87,564 | 83,111 | 77,728
NET INCOME | $ 40,561 | $ 37,910 | $ 38,657 | $ 40,236 | $ 42,906 | $ 35,978 | $ 35,283 | $ 37,338 | $ 157,364 | $ 151,505 | $ 138,183
Basic earnings per share (in dollars per share) | $ 0.41 | $ 0.38 | $ 0.38 | $ 0.39 | $ 0.42 | $ 0.34 | $ 0.33 | $ 0.36 | $ 1.56 | $ 1.45 | $ 1.29
Diluted earnings per share (in dollars per share) | $ 0.41 | $ 0.37 | $ 0.38 | $ 0.39 | $ 0.41 | $ 0.34 | $ 0.33 | $ 0.36 | $ 1.55 | $ 1.45 | $ 1.29
Cash dividends per share (in dollars per share) | $ 0.11 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.10 | $ 0.09 | $ 0.08 | $ 0.09 |  |  |
Return of average assets | 1.10% | 1.04% | 1.07% | 1.19% | 1.32% | 1.10% | 1.11% | 1.15% |  |  |

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