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Stock and Other Incentive Plans (Tables)
 12 Months Ended
Dec. 31, 2022
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, 2022:
Dollars in millionsFUTURE AMORTIZATION
of non-vested shares
2023$12.0 
202410.0 
20258.3 
20265.5 
20270.4 
2028 and thereafter0.1 
Total$36.3 
Schedule of other than stock options, valuation assumptions The Company utilized a Monte Carlo simulation to calculate the weighted average grant date fair values of $30.56 for the absolute TSR component and $41.30 for the relative TSR component for the January 2022 grant using the following assumptions:
Volatility30.0 %
Dividend AssumptionAccrued
Expected term in years3 years
Risk-free rate1.02 %
Stock price (per share)$31.68
Schedule of the activity under the incentive plans the previous directors' plan
A summary of the activity under the Incentive Plans and related information for the three years in the period ended December 31, 2022 follows: 
YEAR ENDED DECEMBER 31,
Dollars in thousands, except per share data202220212020
Share-based awards, beginning of year1,562,028 1,766,061 1,754,066 
Granted657,475 203,701 197,999 
Vested(418,949)(404,777)(186,004)
Forfeited(5,426)(2,957)— 
Share-based awards, end of year1,795,128 1,562,028 1,766,061 
Weighted-average grant date fair value of
Share-based awards, beginning of year$31.10 $30.51 $29.82 
Share-based awards granted during the year$28.11 $30.86 $30.33 
Share-based awards vested during the year$31.52 $28.38 $23.82 
Stock-based awards forfeited during the year$31.48 $33.04 $— 
Share-based awards, end of year$29.91 $31.10 $30.51 
Grant date fair value of shares granted during the year$18,480 $6,286 $6,006 
Schedule of the employee stock purchase plan activity
A summary of the Legacy HR Employee Stock Purchase Plan activity and related information for the three years in the period ended December 31, 2022 is as follows:
YEAR ENDED DECEMBER 31,
Dollars in thousands, except per share data202220212020
Options outstanding, beginning of year348,514 341,647 332,659 
Granted255,960 253,200 212,716 
Exercised(20,246)(30,281)(21,713)
Forfeited(102,619)(71,630)(42,221)
Expired(140,633)(144,422)(139,794)
Options outstanding and exercisable, end of year340,976 348,514 341,647 
Weighted-average exercise price of
Options outstanding, beginning of year$25.38 $24.70 $25.59 
Options granted during the year$26.89 $25.16 $28.36 
Options exercised during the year$20.97 $25.03 $24.10 
Options forfeited during the year$21.88 $25.45 $25.29 
Options expired during the year$23.36 $24.17 $23.74 
Options outstanding, end of year$16.38 $25.38 $24.70 
Weighted-average fair value of options granted during the year (calculated as of the grant date)$9.91 $9.05 $8.06 
Intrinsic value of options exercised during the year$75 $165 $101 
Intrinsic value of options outstanding and exercisable
(calculated as of December 31)
$985 $1,997 $1,673 
Exercise prices of options outstanding
(calculated as of December 31)
$16.38 $25.91 $24.70 
Weighted-average contractual life of outstanding options (calculated as of December 31, in years)0.80.80.8
Schedule of stock options, valuation assumptions
202220212020
Risk-free interest rates0.73 %0.13 %1.58 %
Expected dividend yields3.97 %4.11 %3.69 %
Expected life (in years)1.441.431.43
Expected volatility49.0 %48.2 %28.6 %
Expected forfeiture rates85 %85 %85 %