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Stock-based Compensation (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Stock Options Activity
A summary of the status of Heartland's common stock options as of December 31, 2017, 2016 and 2015, and changes during the years ended December 31, 2017, 2016 and 2015, follows:
 
2017
 
2016
 
2015
 
Shares
 
Weighted-Average Exercise Price
 
Shares
 
Weighted-Average Exercise Price
 
Shares
 
Weighted-Average Exercise Price
Outstanding at January 1
26,400

 
$
18.60

 
125,950

 
$
24.08

 
215,851

 
$
23.85

Granted
—

 
—

 
—

 
—

 
—

 
—

Exercised
(19,400
)
 
18.60

 
(97,800
)
 
25.59

 
(86,651
)
 
23.49

Forfeited
(500
)
 
18.60

 
(1,750
)
 
21.10

 
(3,250
)
 
23.51

Outstanding at December 31
6,500

 
$
18.60

 
26,400

 
$
18.60

 
125,950

 
$
24.08

Options exercisable at December 31
6,500

 
$
18.60

 
26,400

 
$
18.60

 
125,950

 
$
24.08
Summary of Status of RSUs
A summary of the status of RSUs as of December 31, 2017, 2016 and 2015, and changes during the years ended December 31, 2017, 2016, and 2015, follows:
 
2017
 
2016
 
2015
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Shares
 
Weighted-Average Grant Date Fair Value
 
Shares
 
Weighted-Average Grant Date Fair Value
Outstanding at January 1
346,817

 
$
27.61

 
353,195

 
$
25.53

 
396,555

 
$
21.48

Granted
109,373

 
47.22

 
143,721

 
29.75

 
139,943

 
28.90

Vested
(137,394
)
 
26.66

 
(126,614
)
 
23.83

 
(152,981
)
 
18.54

Forfeited
(17,218
)
 
34.02

 
(23,485
)
 
29.80

 
(30,322
)
 
23.38

Outstanding at December 31
301,578

 
$
34.74

 
346,817

 
$
27.61

 
353,195

 
$
25.53