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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2018
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Amounts reported in earnings per share reflect earnings available to common stockholders for the period divided by the weighted average number of shares of common stock outstanding during the period, exclusive of unearned BankFinancial, NA Employee Stock Ownership Plan (the "ESOP") shares in 2017 and unvested restricted stock shares. Stock options and restricted stock are regarded as potential common stock and are considered in the diluted earnings per share calculations to the extent that they would have a dilutive effect if converted to common stock.
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Net income available to common stockholders | $ | 4,630 |  |  | $ | 2,572 |  |  | $ | 8,189 |  |  | $ | 4,453 |
Average common shares outstanding | 17,634,190 |  |  | 18,330,972 |  |  | 17,782,063 |  |  | 18,784,934 |
Less: |  |  |  |  |  |  |
Unearned ESOP shares | — |  |  | — |  |  | — |  |  | (298,813 | )
Unvested restricted stock shares | (375 | ) |  | (940 | ) |  | (656 | ) |  | (940 | )
Weighted average common shares outstanding | 17,633,815 |  |  | 18,330,032 |  |  | 17,781,407 |  |  | 18,485,181 |
Add - Net effect of dilutive unvested restricted stock | — |  |  | 423 |  |  | — |  |  | 416 |
Diluted weighted average common shares outstanding | 17,633,815 |  |  | 18,330,455 |  |  | 17,781,407 |  |  | 18,485,597 |
Basic earnings per common share | $ | 0.26 |  |  | $ | 0.14 |  |  | $ | 0.46 |  |  | $ | 0.24 |
Diluted earnings per common share | $ | 0.26 |  |  | $ | 0.14 |  |  | $ | 0.46 |  |  | $ | 0.24 |

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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