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Earnings Per Share (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Net income available to common stockholders
$
3,737

 
$
3,560

 
$
11,926

 
$
8,013

Average common shares outstanding
17,365,679

 
18,140,599

 
17,641,743

 
18,567,796

Less:
 
 
 
 
 
 
 
Unearned ESOP shares
—

 
—

 
—

 
(198,114
)
Unvested restricted stock shares
—

 
(940
)
 
(435
)
 
(940
)
Weighted average common shares outstanding
17,365,679

 
18,139,659

 
17,641,308

 
18,368,742

Add - Net effect of dilutive unvested restricted stock
—

 
450

 
—

 
428

Diluted weighted average common shares outstanding
17,365,679

 
18,140,109

 
17,641,308

 
18,369,170

Basic earnings per common share
$
0.22

 
$
0.20

 
$
0.68

 
$
0.44

Diluted earnings per common share
$
0.22

 
$
0.20

 
$
0.68

 
$
0.44