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Net Income Per Common Share | 12 Months Ended
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Sep. 30, 2013
Earnings Per Share [Abstract] |
Net Income Per Common Share | Net Income Per Common Share Basic net income per common share is computed by dividing net income to common shareholders by the weighted average number of common shares outstanding during the period, without considering any dilutive items. Diluted net income per common share is computed by dividing net income to common shareholders by the weighted average number of common shares and common stock equivalents for items that are dilutive, net of shares assumed to be repurchased using the treasury stock method at the average share price for Timberland Bancorp’s common stock during the period. The 5% dividend and related accretion for the amount of the Company's Series A Preferred Stock outstanding for the respective year is deducted from net income, and the discount on the redemption of Series A Preferred Stock is added to net income in computing net income to common shareholders. Common stock equivalents arise from assumed conversion of outstanding stock options and outstanding warrants to purchase common stock. In accordance with FASB guidance for stock compensation, shares owned by the Bank’s ESOP that have not been allocated are not considered to be outstanding for the purpose of computing net income per common share. Information regarding the calculation of basic and diluted net income per common share for the years ended September 30, 2013, 2012 and 2011 is as follows (dollars in thousands, except per share amounts):
| 2013 |  |  | 2012 |  |  | 2011 |
Basic net income per common share computation |  |  |  |  |
Numerator - net income | $ | 4,757 |  |  | $ | 4,590 |  |  | $ | 1,089 |
Preferred stock dividends | (710 | ) |  | (832 | ) |  | (832 | )
Discount on redemption of preferred stock | 255 |  |  | — |  |  | — |
Preferred stock discount accretion | (283 | ) |  | (240 | ) |  | (225 | )
Net income to common stockholders | $ | 4,019 |  |  | $ | 3,518 |  |  | $ | 32 |
Denominator - weighted average common shares outstanding | 6,817,918 |  |  | 6,780,612 |  |  | 6,745,347 |
Basic net income per common share | $ | 0.59 |  |  | $ | 0.52 |  |  | $ | — |
Diluted net income per common share computation |  |  |  |  |  |  |  |
Numerator - net income | $ | 4,757 |  |  | $ | 4,590 |  |  | $ | 1,089 |
Preferred stock dividends | (710 | ) |  | (832 | ) |  | (832 | )
Discount on redemption of preferred stock | 255 |  |  | — |  |  | — |
Preferred stock discount accretion | (283 | ) |  | (240 | ) |  | (225 | )
Net income to common stockholders | $ | 4,019 |  |  | $ | 3,518 |  |  | $ | 32 |
Denominator - weighted average common shares outstanding | 6,817,918 |  |  | 6,780,612 |  |  | 6,745,347 |
Effect of dilutive stock options | 16,555 |  |  | — |  |  | 177 |
Effect of dilutive stock warrant | 52,522 |  |  | — |  |  | — |
Weighted average common shares outstanding- assuming dilution | 6,886,995 |  |  | 6,780,612 |  |  | 6,745,524 |
Diluted net income per common share | $ | 0.58 |  |  | $ | 0.52 |  |  | $ | — |
For the years ended September 30, 2013, 2012 and 2011, average options to purchase 109,953, 162,517 and 163,714 shares of common stock, respectively, were outstanding but not included in the computation of diluted net income per common share because their effect would have been anti-dilutive. For the years ended September 30, 2012 and 2011, a warrant to purchase a weighted average of 370,899 shares was outstanding but not included in the computation of diluted net income per common share because the warrant’s exercise price was greater than the average market price of the common shares and, therefore, its effect would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 + Details
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