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Stock and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Schedule of unrecognized compensation cost, nonvested awards The following table represents expected amortization of the Company's non-vested shares issued as of December 31, 2021:
Dollars in millionsFUTURE AMORTIZATION
of non-vested shares
2022$8.3 
20235.6 
20244.3 
20252.8 
20261.0 
2027 and thereafter0.2 
Total$22.2 
Schedule of the activity under the incentive plan the previous directors' plan
A summary of the activity under the 2015 Incentive Plan and related information for the three years in the period ended December 31, 2021 follows: 
YEAR ENDED DECEMBER 31,
Dollars in thousands, except per share data202120202019
Share-based awards, beginning of year1,766,061 1,754,066 1,769,863 
Granted203,701 197,999 276,839 
Vested(404,777)(186,004)(292,636)
Forfeited(2,957)— — 
Share-based awards, end of year1,562,028 1,766,061 1,754,066 
Weighted-average grant date fair value of
Share-based awards, beginning of year$30.51 $29.82 $29.36 
Share-based awards granted during the year$30.86 $30.33 $31.75 
Share-based awards vested during the year$28.38 $23.82 $28.84 
Stock-based awards forfeited during the year$33.04 $— $— 
Share-based awards, end of year$31.10 $30.51 $29.82 
Grant date fair value of shares granted during the year$6,286 $6,006 $8,791 
Schedule of the employee stock purchase plan activity
A summary of the Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2021 is as follows:
YEAR ENDED DECEMBER 31,
Dollars in thousands, except per share data202120202019
Options outstanding, beginning of year341,647 332,659 328,533 
Granted253,200 212,716 235,572 
Exercised(30,281)(21,713)(35,277)
Forfeited(71,630)(42,221)(54,095)
Expired(144,422)(139,794)(142,074)
Options outstanding and exercisable, end of year348,514 341,647 332,659 
Weighted-average exercise price of
Options outstanding, beginning of year$24.70 $25.59 $24.17 
Options granted during the year$25.16 $28.36 $24.17 
Options exercised during the year$25.03 $24.10 $25.01 
Options forfeited during the year$25.45 $25.29 $25.26 
Options expired during the year$24.17 $23.74 $25.77 
Options outstanding, end of year$25.38 $24.70 $25.59 
Weighted-average fair value of options granted during the year (calculated as of the grant date)$9.05 $8.06 $7.02 
Intrinsic value of options exercised during the year$165 $101 $269 
Intrinsic value of options outstanding and exercisable
(calculated as of December 31)
$1,997 $1,673 $2,589 
Exercise prices of options outstanding
(calculated as of December 31)
$25.91 $24.70 $25.59 
Weighted-average contractual life of outstanding options (calculated as of December 31, in years)0.80.80.8
Schedule of fair value of options issued based on weighted-average assumptions
202120202019
Risk-free interest rates0.13 %1.58 %2.48 %
Expected dividend yields4.11 %3.69 %4.19 %
Expected life (in years)1.431.431.45
Expected volatility48.2 %28.6 %29.8 %
Expected forfeiture rates85 %85 %85 %