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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Reconciliation of Basic and Diluted Earnings Per Share
 
For the years ended December 31,
 
2017
 
2016
 
2015
Net income available to common stockholders
$
9,004

 
$
7,502

 
$
8,675

Average common shares outstanding
18,429,018

 
19,673,416

 
20,708,775

Less:
 
 
 
 
 
Unearned ESOP shares
(148,179
)
 
(682,362
)
 
(780,227
)
Unvested restricted stock shares
(940
)
 
(3,103
)
 
(10,545
)
Weighted average common shares outstanding
18,279,899

 
18,987,951

 
19,918,003

Add - Net effect of dilutive stock options and unvested restricted stock
437

 
59,188

 
3,516

Weighted average dilutive common shares outstanding
18,280,336

 
19,047,139

 
19,921,519

Basic earnings per common share
$
0.49

 
$
0.40

 
$
0.44

Diluted earnings per common share
$
0.49

 
$
0.39

 
$
0.44

Number of antidilutive stock options excluded from the diluted earnings per share calculation
—

 
536,459

 
536,459

Weighted average exercise price of anti-dilutive option shares
$
—

 
$
12.99

 
$
12.99