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Condensed Financial Information - Parent Company Only: Condensed Statements of Operations, Parent Company (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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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, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Operating income |  |  |  |  |  |  |  |  |  |  |
Interest on deposits in banks |  |  |  |  |  |  |  |  | $ 366 | $ 336 | $ 338
Operating expenses |  |  |  |  |  |  |  |  | 759 | 607 | 776
Income (loss) before income taxes and equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 8,650 | 7,271 | 6,371
Benefit for income taxes | (776) | (685) | (537) | (802) | (740) | (373) | (582) | (819) | (2,800) | (2,514) | (1,781)
Net income | 1,646 | 1,434 | 1,159 | 1,611 | 895 | 876 | 1,278 | 1,708 | 5,850 | 4,757 | 4,590
Preferred stock dividends | 0 | 0 | 0 | 136 | 151 | 151 | 207 | 201 | (136) | (710) | (832)
Preferred stock accretion | 0 | 0 | 0 | 70 | 47 | 47 | 126 | 63 | (70) | (283) | (240)
Discount on redemption of preferred stock |  |  |  |  |  |  |  |  | 0 | 255 | 0
Net income to common shareholders | 1,646 | 1,434 | 1,159 | 1,405 |  |  |  |  | 5,644 | 4,019 | 3,518
Parent Company |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  |  |  |  |  |  |
Interest on deposits in banks |  |  |  |  |  |  |  |  | 0 | 1 | 1
Interest on loan receivable from ESOP |  |  |  |  |  |  |  |  | 206 | 237 | 266
Dividend Income, Operating |  |  |  |  |  |  |  |  | 13,190 | 3,300 | 0
Total operating income |  |  |  |  |  |  |  |  | 13,396 | 3,538 | 267
Operating expenses |  |  |  |  |  |  |  |  | 409 | 455 | 556
Income (loss) before income taxes and equity in undistributed income of Bank |  |  |  |  |  |  |  |  | 12,987 | 3,083 | (289)
Benefit for income taxes |  |  |  |  |  |  |  |  | 110 | 98 | 98
Income (loss) before undistributed income of Bank |  |  |  |  |  |  |  |  | 13,097 | 3,181 | (191)
Equity in undistributed income of Bank (dividends in excess of income of Bank) |  |  |  |  |  |  |  |  | (7,247) | 1,576 | 4,781
Net income |  |  |  |  |  |  |  |  | 5,850 | 4,757 | 4,590
Preferred stock dividends |  |  |  |  |  |  |  |  | (136) | (710) | (832)
Preferred stock accretion |  |  |  |  |  |  |  |  | (70) | (283) | (240)
Discount on redemption of preferred stock |  |  |  |  |  |  |  |  | 0 | 255 | 0
Net income to common shareholders |  |  |  |  |  |  |  |  | $ 5,644 | $ 4,019 | $ 3,518

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