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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Summary of Option Activity
A summary of option activity as of December 31, 2019, 2018, and 2017, and changes during each year, is presented below:
 
Shares
 
Weighted-Average Exercise Price
 
Weighted-Average Remaining Contractual Term
 
Aggregate Intrinsic Value
 
(In thousands)
 
 
 
 
 
(In thousands)
Outstanding at December 31, 2016
489

 
$7.19
 
7.0 years
 

Granted
654

 
9.44

 
 
 
 
Exercised
(70
)
 
5.77

 
 
 
 
Forfeited or expired
(186
)
 
9.24

 
 
 
 
Outstanding at December 31, 2017
887

 
8.53

 
8.4 years
 
527

Granted
582

 
8.60

 
 
 
 
Exercised
(21
)
 
4.88

 
 
 
 
Forfeited or expired
(154
)
 
8.74

 
 
 
 
Outstanding at December 31, 2018
1,294

 
8.60

 
8.1 years
 
667

Granted
591

 
9.70

 
 
 
 
Exercised
(111
)
 
5.91

 
 
 
 
Forfeited or expired
(80
)
 
9.24

 
 
 
 
Outstanding at December 31, 2019
1,694

 
$9.13
 
7.9 years
 
$3,969
Vested and Exercisable at December 31, 2019
702

 
$8.91
 
6.9 years
 
$1,795
Schedule of Weighted-Average Assumptions to Estimate Fair Value of Each Option
The fair value of each option was estimated on the date of grant using the Black-Scholes-Merton option-pricing formula, with the following weighted average assumptions:
 
 
2019
 
2018
Expected dividend yield
 
3.80
%
 
3.50
%
Expected volatility
 
36.73
%
 
42.67
%
Risk-free interest rate
 
2.56
%
 
2.75
%
Expected term of options
 
7 years

 
7 years
Nonvested Performance Shares
A summary of the status of the Company's nonvested performance shares as of December 31, 2019, 2018, and 2017, and changes during each year, is presented below:
 
Shares
 
Weighted-Average Grant-Date Fair Value
Nonvested at December 31, 2016
806,881

 
$6.17
Granted
930,295

 
7.54

Vested
(668,649
)
 
5.38

Forfeited or unearned
(184,185
)
 
5.85

Nonvested at December 31, 2017
884,342

 
7.05

Granted
751,128

 
7.43

Vested
(445,311
)
 
5.98

Forfeited or unearned
(201,322
)
 
7.54

Nonvested at December 31, 2018
988,837

 
8.07

Granted
626,776

 
8.87

Vested
(214,824
)
 
8.49

Forfeited or unearned
(427,010
)
 
8.34

Nonvested at December 31, 2019
973,779

 
$8.38
Restricted Shares
A summary of the status of the Company's restricted shares of CRD-A as of December 31, 2019, 2018, and 2017 and changes during each year, is presented below:
 
Shares
 
Weighted-Average Grant-Date Fair Value
Nonvested at December 31, 2016
67,669

 
$7.56
Granted
210,875

 
9.26

Vested
(166,325
)
 
9.50

Forfeited or unearned
—

 
—

Nonvested at December 31, 2017
112,219

 
7.89

Granted
112,502

 
7.81

Vested
(131,260
)
 
8.27

Forfeited or unearned
(21,352
)
 
8.43

Nonvested at December 31, 2018
72,109

 
7.76

Granted
149,496

 
9.38

Vested
(108,610
)
 
9.04

Forfeited or unearned
(31,387
)
 
9.55

Nonvested at December 31, 2019
81,608

 
$8.35