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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019, 2018 and 2017:
 
Shares
 
Weighted-Average Exercise Price
 
Weighted-Average
Remaining
Contractual
Term
(In years)
 
Aggregate
Intrinsic
Value
(In
thousands)
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 at December 31, 2018
12,558

 
14.77

 
 
 
 
Exercised
(3,901
)
 
14.77

 
 
 
 
Outstanding, vested and expected to vest and exercisable at December 31, 2019
8,657

 
$
14.77

 
0.40
 
$
117
Schedule of restricted stock award activity
The following table summarizes the restricted stock award activity for the years ended December 31, 2019, 2018 and 2017:
 
Shares
 
Weighted-Average Grant Date Fair Value
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

Vested
(43,148
)
 
17.07

Forfeited
(2,178
)
 
18.32

Nonvested at December 31, 2019
20,707

 
$
17.59
Schedule of assumptions of PRSUs granted The Company used the following assumptions to estimate the fair value of PRSUs granted for the periods indicated:
 
Year ended December 31,
 
2019
 
2018
 
2017
Shares issued
7,198

 
5,550

 
6,089

Expected Term in Years
2.84

 
2.84

 
2.85

Weighted-Average Risk Free Interest Rate
2.47
%
 
2.39
%
 
1.40
%
Weighted Average Fair Value
$
30.06

 
$
27.69

 
$
24.39

Correlation coefficient
ABA NASDAQ Community Bank Index
 
ABA NASDAQ Community Bank Index
 
ABA NASDAQ Community Bank Index
Range of peer company volatilities
19.9% - 75.4%

 
19.0% - 51.4%

 
17.8%-63.1%

Range of peer company correlation coefficients
34.5% - 90.7%

 
28.2% - 94.3%

 
8.2%-89.8%

Heritage volatility
23.9
%
 
22.3
%
 
21.8
%
Heritage correlation coefficient
79.9
%
 
76.4
%
 
75.9
%
Summary of RSU activity
The following table summarizes the unit activity for the years ended December 31, 2019, 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

Granted
126,598

 
31.89

Vested
(64,173
)
 
29.25

Forfeited
(8,070
)
 
30.25

Nonvested at December 31, 2019
233,540

 
$
30.41