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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Activity Related to Stock Options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | ​ | ​ |  | Weighted- |  | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Weighted- | ​ | Remaining | ​ | Intrinsic
​ | ​ | Number of | ​ | Average Exercise | ​ | Contractual | ​ | Value
​ |  | Options |  | Price |  | Years |  | (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Options outstanding at January 1, 2021 as adjusted for conversion | ​ | 18,685 | ​ | $ | 23.23 | ​ | ​ | ​ | ​ | ​
Options acquired | ​ | 180,020 | ​ | ​ | 35.39 | ​ | ​ | ​ | ​ | ​
Options exercised | ​ | (48,031) | ​ |  | 30.66 | ​ | ​ | ​ | ​ | ​
Options forfeited | ​ | (29,421) | ​ |  | 35.38 | ​ | ​ | ​ | ​ | ​
Options outstanding at December 31, 2021 |  | 121,253 | ​ | $ | 35.39 |  | 7.2 | ​ | $ | 14
Options vested and exercisable at December 31, 2021 |  | 121,253 | ​ | $ | 35.39 |  | 7.2 | ​ | $ | 14
Information Related to Stock Option Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) | ​ | 2021 |  | 2020 |  | 2019
Cash received for option exercise cost | ​ | $ | 431 | ​ | $ | 38 | ​ | $ | 367
Income tax (expense) benefit recognized on stock option exercises | ​ |  | (15) | ​ |  | — | ​ |  | 39
Intrinsic value of options exercised | ​ |  | 171 | ​ |  | 8 | ​ |  | 229
Schedule of exercise prices and weighted-average remaining contractual lives of both outstanding and vested options | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Outstanding Options | Vested Options
​ | ​ | ​ | ​ | Weighted | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Contractual | ​ | ​ | ​ | Contractual
​ | ​ | ​ | ​ | Years | ​ | ​ | ​ | Years
​ |  | Amount |  | Remaining |  | Amount |  | Remaining
Exercise Prices: |  |  |  |  |  |  |  |
$34.87 |  | 46,799 |  | 8.1 |  | 46,799 |  | 8.1
$35.35 |  | 42,475 |  | 7.1 |  | 42,475 |  | 7.1
$36.19 |  | 31,979 |  | 6.1 |  | 31,979 |  | 6.1
Total |  | 121,253 |  | 7.2 |  | 121,253 |  | 7.2
Activity Related to Restricted Stock Awards | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant-Date
​ |  | Shares |  | Fair Value
​ | ​ | ​ | ​ | ​ | ​
Unvested allocated shares outstanding at January 1, 2021 | ​ | — | ​ | $ | —
Shares acquired in the Merger | ​ | 101,778 | ​ | ​ | 25.98
Shares granted |  | 390,027 | ​ |  | 26.48
Shares vested | ​ | (9,838) | ​ | ​ | 25.41
Shares forfeited |  | (35,044) | ​ |  | 25.89
Unvested allocated shares at December 31, 2021 |  | 446,923 | ​ | $ | 26.45
Information Related to Restricted Stock Award Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(Dollars in thousands) | ​ | ​ | 2021 |  | ​ | 2020 |  | ​ | 2019
Compensation expense recognized | ​ | $ | 5,253 | ​ | $ | 4,217 | ​ | $ | 1,540
Income tax benefit (expense) recognized on vesting of RSAs | ​ |  | 27 | ​ |  | (211) | ​ |  | 11
Performance Shares [Member] | Long Term Incentive Award Program |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Activity Related to Performance Based Equity Awards | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ |  | Weighted-
​ | ​ | ​ | ​ | Average
​ | ​ | Number of | ​ | Grant-Date
​ |  | Shares |  | Fair Value
Maximum aggregate share payout at January 1, 2021 | ​ | — | ​ | $ | —
Shares granted |  | 38,948 | ​ |  | 31.40
Maximum aggregate share payout at December 31, 2021 |  | 38,948 | ​ | $ | 31.40
Minimum aggregate share payout |  | — | ​ | ​ | —
Expected aggregate share payout |  | 29,951 | ​ | $ | 30.72
Information Related to Performance Based Share Award Plan | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
(In thousands) | ​ | 2021 |  | 2020 |  | 2019
Compensation expense recognized | ​ | $ | 154 | ​ | $ | 2,279 | ​ | $ | 132
Income tax benefit recognized on vesting of PSAs | ​ |  | — | ​ |  | 60 | ​ |  | —

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