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EMPLOYEE BENEFITS AND STOCK BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2019
Employee Benefits and Share-based Compensation, Noncash [Abstract] |
Payment Made for Employee Benefit Plans | The following 401(k) Plan match and other discretionary contributions were made to the Company’s employees, in accordance with the plans described above, in 2019, 2018, and 2017 (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018 |  | 2017
401(k) Plan | ​ | $ | 5,550 | ​ | $ | 4,592 | ​ | $ | 3,505
ESOP | ​ |  | 1,163 | ​ |  | 1,005 | ​ |  | 1,255
Cash | ​ |  | 780 | ​ |  | 1,509 | ​ |  | 1,461
Total | ​ | $ | 7,493 | ​ | $ | 7,106 | ​ | $ | 6,221
Schedule of Recognized Stock-Based Compensation Expense | For the years ended December 31, 2019, 2018, and 2017, the Company recognized stock-based compensation expense (included in salaries and benefits expense) (dollars in thousands, except per share data) as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ |  | 2019 |  | 2018 |  | 2017
Stock-based compensation expense | ​ | $ | 8,332 | ​ | $ | 6,132 | ​ | $ | 4,648
Reduction of income tax expense | ​ |  | 1,750 | ​ |  | 1,287 | ​ |  | 1,467
Per share compensation cost | ​ | $ | 0.08 | ​ | $ | 0.07 | ​ | $ | 0.06
Summary of Stock Option Activity | The following table summarizes the stock option activity during the year ended December 31, 2019:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | Stock | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | Options | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | (shares) | ​ | Price | ​ | Life | ​ | Value
Outstanding as of December 31, 2018 |  | 47,585 | ​ | $ | 14.44 |  |  |  | ​ |
Options assumed in the Access acquisition | ​ | 448,679 | ​ | ​ | 33.45 | ​ | ​ | ​ | ​ | ​
Granted |  | — | ​ |  | — |  |  |  | ​ |
Exercised |  | (56,619) | ​ |  | 24.48 |  |  |  | ​ |
Forfeited |  | (9,447) | ​ |  | 31.94 |  |  |  | ​ |
Expired |  | (8,060) | ​ |  | 36.78 |  |  |  | ​ |
Outstanding as of December 31, 2019 |  | 422,138 | ​ |  | 32.48 |  | 2.55 | ​ | $ | 2,313,739
Exercisable as of December 31, 2019 |  | 368,146 | ​ |  | 32.57 |  | 2.33 | ​ |  | 2,006,915
Summary of Nonvested Stock Activity | The following table summarizes the restricted stock activity for the year ended December 31, 2019:
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | Number of | ​ | Average
​ | ​ | Shares of | ​ | Grant-Date Fair
​ | ​ | RSAs | ​ | Value
Unvested as of December 31, 2018 |  | 375,414 | ​ | $ | 32.41
Granted |  | 273,718 | ​ |  | 35.06
Net settle for taxes |  | (52,253) | ​ |  | 52.01
Vested |  | (148,584) | ​ |  | 30.78
Forfeited |  | (16,653) | ​ |  | 34.31
Unvested as of December 31, 2019 |  | 431,642 | ​ |  | 34.90
Summary of Performance Stock Activity | PSUs are granted to certain employees at no cost to the recipient and are subject to vesting based on achieving certain performance metrics; the grant of PSUs is subject to approval by the Company’s Compensation Committee at its sole discretion. PSUs may be paid in cash or shares of common stock or a combination thereof. Holders of PSUs have no right to vote the shares represented by the units. In 2019, the PSUs awarded were market based awards with the number of PSUs ultimately earned based on the Company’s total shareholder return as measured over the performance period. ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | Weighted Average
​ | ​ | Shares of | ​ | Grant-
​ | ​ | PSUs | ​ | Date Fair Value
Unvested as of December 31, 2018 |  | 150,047 | ​ | $ | 31.67
Granted |  | 85,543 | ​ |  | 33.66
Net settle for taxes |  | (15,018) | ​ |  | 34.63
Vested |  | (69,205) | ​ |  | 24.27
Forfeited |  | (6,658) | ​ |  | 36.08
Unvested as of December 31, 2019 |  | 144,709 | ​ |  | 37.24
Schedule of Performance Stock Units Valuation Assumptions | During years ended December 31, 2019, 2018 and 2017 PSUs were awarded with a market based component based on total shareholder return. The fair value of each PSU granted is estimated on the date of grant using the Monte Carlo simulation lattice model that uses the assumptions noted in the following table: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019(5) |  | 2018(5) |  | 2017(5) |
Dividend yield(1) |  | 2.57 | % | 2.25 | % | 2.15 | %
Expected life in years(2) |  | 2.86 |  | 2.86 |  | 2.85 | ​
Expected volatility(3) |  | 24.04 | % | 23.47 | % | 23.35 | %
Risk-free interest rate(4) |  | 2.48 | % | 2.38 | % | 1.40 | %
(1) | Calculated as the ratio of the current dividend paid per the stock price on the date of grant.
(2) | Represents the remaining performance period as of the grant date.
(3) | Based on the historical volatility for the period commensurate with the expected life of the PSUs.
(4) | Based upon the zero-coupon U.S. Treasury rate commensurate with the expected life of the PSUs on the grant date.
(5) | Assumptions disclosed represent those used in the primary annual issuance.
Estimated Unamortized Compensation Expense Recognized in Future | The estimated unamortized compensation expense, net of estimated forfeitures, related to, restricted stock and performance stock issued and outstanding as of December 31, 2019 that will be recognized in future periods is as follows (dollars in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Restricted |  | Performance |  | ​ | ​
​ | ​ | Stock | ​ | Stock | ​ | Total
2020 | ​ | $ | 5,030 | ​ | $ | 1,406 | ​ | $ | 6,436
2021 | ​ |  | 3,299 | ​ |  | 887 | ​ |  | 4,186
2022 | ​ |  | 652 | ​ |  | — | ​ |  | 652
2023 | ​ |  | 100 | ​ |  | — | ​ |  | 100
Total | ​ | $ | 9,081 | ​ | $ | 2,293 | ​ | $ | 11,374
​

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