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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of stock option activity
The following table summarizes the stock option activity for the years ended December 31, 2018, 2017 and 2016:
 
Shares
 
Weighted-Average Exercise Price
 
Weighted-Average
Remaining
Contractual
Term (In years)
 
Aggregate
Intrinsic
Value (In
thousands)
Outstanding at December 31, 2015
79,408

 
$
14.19

 
 
 
 
Exercised
(37,713
)
 
14.31

 
 
 
 
Forfeited or expired
(4,200
)
 
16.80

 
 
 
 
Outstanding at December 31, 2016
37,495

 
13.77

 
 
 
 
Exercised
(12,662
)
 
12.97

 
 
 
 
Forfeited or expired
(1,602
)
 
13.76

 
 
 
 
Outstanding at December 31, 2017
23,231

 
14.21

 
 
 
 
Exercised
(9,842
)
 
13.45

 
 
 
 
Forfeited or expired
(831
)
 
14.77

 
 
 
 
Outstanding, vested and expected to vest and exercisable at December 31, 2018
12,558

 
$
14.77

 
1.39
 
$
188
Schedule of restricted stock award activity
The following table summarizes the restricted stock award activity for the years ended December 31, 2018, 2017 and 2016:
 
Shares
 
Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2015
264,521

 
$
15.92

Granted
121,039

 
17.60

Vested
(112,516
)
 
15.62

Forfeited
(11,748
)
 
16.62

Nonvested at December 31, 2016
261,296

 
16.80

Vested
(113,479
)
 
16.55

Forfeited
(10,418
)
 
16.80

Nonvested at December 31, 2017
137,399

 
17.00

Vested
(67,877
)
 
16.74

Forfeited
(3,489
)
 
16.92

Nonvested at December 31, 2018
66,033

 
$
17.28
Schedule of assumptions of PRSUs granted
The Company used the following assumptions to estimate the fair value of PRSUs granted during February 2018 and 2017:
 
2018
 
2017
Shares issued
5,550

 
6,089

Expected Term in Years
2.84

 
2.85

Weighted-Average Risk Free Interest Rate
2.39
%
 
1.40
%
Expected Dividend Yield
—
%
 
—
%
Weighted-Average Fair Value
27.69

 
24.39

Correlation coefficient
ABA NASDAQ Community Bank Index
 
ABA NASDAQ Community Bank Index
Range of peer company volatilities
18.99% - 51.42%

 
17.8% - 63.1%

Range of peer company correlation coefficients
28.16% - 94.29%

 
8.24% - 89.79%

Heritage volatility
22.30
%
 
21.80
%
Heritage correlation coefficient
76.44
%
 
75.93
%
Summary of RSU activity
The following table summarizes the unit activity for the year ended December 31, 2018 and 2017:
 
Units
 
Weighted-Average Grant Date Fair Value
Nonvested at December 31, 2016
—

 
$
—

Granted
92,356

 
25.31

Forfeited
(1,812
)
 
25.35

Nonvested at December 31, 2017
90,544

 
25.31

Granted
125,633

 
30.62

Vested
(32,375
)
 
25.44

Forfeited
(4,617
)
 
27.82

Nonvested at December 31, 2018
179,185

 
$
28.94