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Stock-Based Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]  
Schedule of Option Pricing Assumptions and Estimated Fair Value The following table presents the option pricing assumptions and the estimated fair value of the options using these assumptions for grants made for the period indicated:
For The Year Ended
December 31,
2018
Weighted-average dividend yield2.36 %
Weighted-average risk-free interest rate2.38 %
Weighted-average expected volatility22.80 %
Weighted-average expected life (in years)5.3
Weighted-average fair value of options granted$7.78 
Schedule of Stock Option Activity
Stock option activity for the year ended December 31, 2020 was as follows:
(Dollars in thousands, except per option data)Number of OptionsWeighted-Average
Exercise Price per Option		Weighted-Average
Remaining
Contractual Term
(Years)		Aggregate
Intrinsic
Value
Options outstanding at January 1, 202013,607 $23.69   
Granted— —     
Exercised(3,094)18.24     
Forfeited— — 
Expired— — 
Options outstanding at December 31, 202010,513 $25.29 3.1$117 
Options exercisable at December 31, 20209,613 $24.22 2.7$114 

A summary of the status of the Company’s nonvested stock options as of December 31, 2020 and changes during the year then ended was as follows:
OptionsWeighted-Average
Grant Date
Fair Value per Option
Nonvested at January 1, 20201,850 $6.48 
Granted— — 
Vested(950)6.08 
Forfeited— — 
Nonvested at December 31, 2020900 $6.89 
Schedule of Compensation Expense
Compensation expense and the related income tax benefit recognized in connection with the restricted stock units was as follows for the periods indicated:
For The Year Ended
December 31,
(In thousands)202020192018
Compensation expense$475 $389 $263 
Income tax benefit102 84 57 
Fair value of grants vested407 302 149 
Compensation expense and the related income tax benefit recognized in connection with the restricted stock awards was as follows for the periods indicated:
For The Year Ended
December 31,
(In thousands)202020192018
Compensation expense$781 $751 $916 
Income tax benefit168 161 197 
Fair value of grants vested772 780 931 
Compensation expense and the related income tax benefit recognized in connection with the MSPP awards was as follows for the periods indicated:
For The Year Ended
December 31,
(In thousands)202020192018
Compensation expense$71 $95 $104 
Income tax benefit15 20 22 
Fair value of grants vested110 75 130 
Compensation expense and the related tax benefit for the LTIP's performance-based awards was as follows for the periods indicated:
For The Year Ended
December 31,
(In thousands)202020192018
Compensation expense$332 $532 $291 
Related income tax benefit71 114 63 
Fair value of grants vested— 344 284 
Compensation expense and the related tax benefit recognized in connection with the DCRP was as follows for the periods presented:
For The Year Ended
December 31,
(In thousands)202020192018
Compensation expense$122 $110 $106 
Related income tax benefit26 24 23 
Fair value of grants vested129 102 105 
Summary of Nonvested Share Awards Activity
Restricted stock unit activity for the year ended December 31, 2020 was as follows:
(Dollars in thousands, except per unit data)
Number of UnitsWeighted-Average
Grant Date
Fair Value per Unit		Weighted-Average
Remaining
Contractual Term
(Years)		Aggregate
Intrinsic Value		Unrecognized
Compensation
Nonvested at January 1, 202036,052 $43.92     
Granted16,181 30.88     
Vested(9,265)43.90 
Forfeited(1,601)39.79 
Nonvested at December 31, 202041,367 $38.98 3.1$1,480 $1,196 
Restricted stock award activity for the year ended December 31, 2020 is as follows:
(Dollars in thousands, except per share data)
Number of SharesWeighted-Average
Grant Date
Fair Value per Share		Weighted-Average
Remaining
Contractual Term
(Years)		Aggregate
Intrinsic Value		Unrecognized
Compensation
Nonvested at January 1, 202019,287 $41.66     
Granted31,983 31.35   
Vested(20,992)36.76 
Forfeited(1,622)41.53 
Nonvested at December 31, 202028,656 $33.75 2.2$1,025 $646 
MSPP award activity for the year ended December 31, 2020 was as follows:
(Dollars in thousands, except per share data)
Number of SharesWeighted-Average
Grant Date
Fair Value per Share		Weighted-Average
Remaining
Contractual Term
(Years)		Aggregate
Intrinsic Value		Unrecognized
Compensation
Nonvested at January 1, 202015,015 $12.89     
Granted11,210 7.39     
Vested(7,478)14.72 
Forfeited(1,723)10.16 
Nonvested at December 31, 202017,024 $8.74 0.8$154 $51 
LTIP performance-based award activity for the year ended December 31, 2020 was as follows:
(Dollars in thousands, except per share data)
Number of SharesWeighted-Average
Grant Date
Fair Value per Share		Weighted-Average
Remaining
Contractual Term
(Years)		Aggregate
Intrinsic Value		Unrecognized
Compensation
Nonvested at January 1, 202027,765 $44.26     
Granted(1)
28,766 31.41     
Vested— — 
Forfeited(5,137)44.26 
Nonvested at December 31, 202051,394 $37.07 1.7$1,905 $388 
(1)    Number of shares granted assumes payout at 200% of target.
DCRP award activity for the year ended December 31, 2020 was as follows:
(Dollars in thousands, except per award data)
Number of Deferred Stock AwardsWeighted-Average
Grant Date
Fair Value per Award		Weighted-Average
Remaining
Contractual Term
(Years)		Aggregate
Intrinsic Value		Unrecognized
Compensation
Nonvested at January 1, 202010,651 $31.14     
Granted5,556 30.45     
Vested(4,306)30.05 
Forfeited(6,529)28.97 
Nonvested at December 31, 20205,372 $33.93 19.1$192 $151