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Earnings Per Share (Notes)
 6 Months Ended
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