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STOCK BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of Cumulatively Granted Stock Options and Restricted Stock Awards, Net of Forfeitures and Expirations
The following table presents the amount of cumulatively granted stock option awards and restricted stock awards, net of forfeitures and expirations, granted through December 31, 2022:
 Authorized Awards Cumulatively Granted, Net of
Forfeitures and Expirations		TotalAuthorized
but
Unissued
Stock
Option  Awards		Restricted
Stock  Awards
2005 Plan1,650,000 387,258 986,882 1,374,140 275,860 
2018 Plan300,000 — 38,357 38,357 261,643 
Schedule of Pre-tax Compensation Expense and Related Tax Benefits
The following table presents the pre-tax expense associated with stock option and restricted stock awards and the related tax benefits recognized for the periods presented:
 Years Ended December 31
 202220212020
 (Dollars in thousands)
Stock based compensation expense
Restricted stock awards (1)$3,791 $3,580 $3,272 
Directors’ fee expense (2)
Restricted stock awards673 729 851 
Total stock based award expense$4,464 $4,309 $4,123 
Related tax benefits recognized in earnings$1,255 $1,212 $1,159 
(1)Inclusive of compensation expense associated with time-vested and performance-based restricted stock awards.
(2)Expense related to awards issued to directors is recognized as directors’ fees within other noninterest expense.
Schedule of Relevant Information Relating to Stock Options
The following table presents relevant information relating to the Company’s stock options for the periods presented:
 Years Ended December 31
 202220212020
 (Dollars in thousands, except per share data)
Fair value of stock options vested based on grant date fair value$— $— $22 
Intrinsic value of stock options exercised$— $414 $404 
Cash received from stock option exercises$— $233 $279 
Tax benefit realized on stock option exercises$— $116 $114 
Schedule of Stock Options
The following table presents a summary of stock option award activity for the year ended December 31, 2022:
 Outstanding
 Stock Option
Awards		 Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term (years)		Aggregate
Intrinsic
Value (1)
 (Dollars in thousands, except per share data)
Balance at January 1, 202220,000   $56.18 
Granted—   — 
Exercised— — 
Balance of options outstanding, vested and exercisable at December 31, 202220,000 (2)$56.18 3.35 years$568 
(1)The aggregate intrinsic value represents the total pre-tax intrinsic value, based on the average of the high price and low price at which the Company’s common stock traded on December 31, 2022 of $84.57, which would have been received by in-the-money option holders had they all exercised their options as of that date.
(2)Represents vested stock options outstanding to Directors.

For the year ended December 31, 2022, all outstanding stock option awards are vested and there is no unrecognized compensation expense related to those options.
Schedule of Restricted Stock Granted
During the years ended December 31, 2022, 2021, and 2020 the Company made the following restricted stock award grants:
Shares GrantedPlanFair Value Vesting Period
Time-vested
2022
2/17/202252,100 2005 $84.70 Ratably over 5 years from grant date
5/24/20228,099 2018$80.39 Immediately upon grant date
9/15/2022646 2005$77.44 Ratably over 5 years from grant date
2021
2/18/202149,550 2005$81.84 Ratably over 5 years from grant date
5/25/20217,680 2018$78.18 Immediately upon grant date
9/1/2021640 2018$76.78 Immediately upon grant date
2020
2/27/202046,550 2005$70.24 Ratably over 5 years from grant date
4/15/2020880 2005$70.02 Ratably over 5 years from grant date
5/27/20209,438 2018$72.86 Immediately upon grant date
Performance-based
2/17/202220,700 2005$84.70 
The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2025.
2/18/202118,900 2005$81.84 
The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2024.
2/27/202017,100 2005$70.24 
The earlier of: the date on which it is determined if the performance goal has been achieved; or, March 31, 2023.
Schedule of Share-based Compensation, Fair Value of Restricted Stock Awards Vesting [Table Text Block]
The following table presents the fair value of restricted stock awards that vested during the periods presented:
 Years Ended December 31
 202220212020
 (Dollars in thousands)
Fair value of restricted stock awards upon vesting$5,148 $5,754 $5,580 
Schedule of Restricted Stock Awards
The following table presents a summary of restricted stock award activity for the year ended December 31, 2022:
 Outstanding Restricted Stock
Awards		 Weighted Average
Grant Price ($)		 
  
Balance at January 1, 2022185,173   $77.03 
Granted81,545   84.21 
Vested/released(61,396)75.73 
Forfeited (2)(13,910)  81.96 
Balance at December 31, 2022191,412 (1)$80.15 
Unrecognized compensation cost (in thousands) (1)$8,916 
Weighted average remaining recognition period (years)3.09 years
(1)There are no unvested restricted stock awards outstanding to Directors and therefore no related unrecognized compensation cost for Directors.