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Stock Based Compensation | 12 Months Ended
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Dec. 31, 2020
Share-based Payment Arrangement [Abstract] |
Stock Based Compensation | Stock Based Compensation As of December 31, 2020, the Company had four active stock-based employee compensation plans. These plans include three executive stock award plans, the Executive Incentive Plan (EIP), the Restricted Stock Award Plan (RSAP), the Strategic Deployment Incentive Plan (SDP); and the Employee Stock Purchase Plan (ESPP). The 2011 Stock Option Plan was approved by the shareholders on April 21, 2011 but the Company had not made any grants through December 31, 2020. These stock-based employee compensation plans were established to help retain and motivate key employees. All of the plans have been approved by the shareholders of 1st Source Corporation. The Executive Compensation and Human Resources Committee (the “Committee”) of the 1st Source Corporation Board of Directors has sole authority to select the employees, establish the awards to be issued, and approve the terms and conditions of each award under the stock-based compensation plans. Stock-based compensation to employees is recognized as compensation cost on the Consolidated Statements of Income based on their fair values on the measurement date, which, for 1st Source, is the date of grant. Stock-based compensation expense is recognized ratably over the requisite service period for all awards. The total fair value of share awards vested was $2.67 million during 2020, $3.35 million in 2019, and $3.53 million in 2018. The following table shows the combined summary of activity regarding active stock option and stock award plans.
|  |  | Non-Vested Stock Awards Outstanding |  |
| Shares Available for Grant |  | Number of Shares |  | Weighted-Average Grant-Date Fair Value |  |  |  |
Balance, January 1, 2018 | 676,444 |  |  | 295,926 |  |  | $ | 27.41 |  |  |  |  |
Shares authorized - 2018 EIP | 70,461 |  |  | — |  |  | — |  |  |  |  |
Granted | (74,981) |  |  | 74,981 |  |  | 29.11 |  |  |  |  |
Stock awards vested | — |  |  | (106,513) |  |  | 25.79 |  |  |  |  |
Forfeited | 3,135 |  |  | (10,575) |  |  | 27.51 |  |  |  |  |
Balance, December 31, 2018 | 675,059 |  |  | 253,819 |  |  | 28.59 |  |  |  |  |
Shares authorized - 2019 EIP | 62,538 |  |  | — |  |  | — |  |  |  |  |
Granted | (74,336) |  |  | 74,336 |  |  | 31.44 |  |  |  |  |
Stock awards vested | — |  |  | (100,299) |  |  | 28.35 |  |  |  |  |
Forfeited | 1,241 |  |  | (8,865) |  |  | 30.28 |  |  |  |  |
Balance, December 31, 2019 | 664,502 |  |  | 218,991 |  |  | 29.60 |  |  |  |  |
Shares authorized - 2020 EIP | 60,233 |  |  | — |  |  | — |  |  |  |  |
Granted | (147,576) |  |  | 147,576 |  |  | 37.41 |  |  |  |  |
Stock awards vested | — |  |  | (74,203) |  |  | 28.95 |  |  |  |  |
Forfeited | 49 |  |  | (870) |  |  | 31.82 |  |  |  |  |
Balance, December 31, 2020 | 577,208 |  |  | 291,494 |  |  | $ | 33.71 |  |  |  |  |
Stock Option Plans — Incentive stock option plans include the 2011 Stock Option Plan (the “2011 Plan”). Each award from the plan is evidenced by an award agreement that specifies the option price, the duration of the option, the number of shares to which the option pertains, and such other provisions as the Committee determines. The option price is equal to the fair market value of a share of 1st Source Corporation’s common stock on the date of grant. Options granted expire at such time as the Committee determines at the date of grant and in no event does the exercise period exceed a maximum of ten years. Upon merger, consolidation, or other corporate consolidation in which 1st Source Corporation is not the surviving corporation, as defined in the plans, all outstanding options immediately vest. There were zero stock options exercised during 2020, 2019 or 2018. All shares issued in connection with stock option exercises and non-vested stock awards are issued from available treasury stock. No stock-based compensation expense related to stock options was recognized in 2020, 2019 or 2018. The fair value of each option on the date of grant is estimated using the Black-Scholes option pricing model. Expected volatility is based on the historical volatility estimated over a period equal to the expected life of the options. In estimating the fair value of stock options under the Black-Scholes valuation model, separate groups of employees that have similar historical exercise behavior are considered separately. The expected life of the options granted is derived based on past experience and represents the period of time that options granted are expected to be outstanding. Stock Award Plans — Incentive stock award plans include the EIP, the SDP and the RSAP. The EIP is administered by the Committee. Awards under the EIP and SDP include “book value” shares and “market value” shares of common stock. These shares are awarded annually based on weighted performance criteria and generally vest over a period of five years. The EIP book value shares may only be sold to 1st Source and such sale is mandatory in the event of death, retirement, disability, or termination of employment. The RSAP is designed for key employees. Awards under the RSAP are made to employees recommended by the Chief Executive Officer and approved by the Committee. Shares granted under the RSAP vest over a period of up to ten years and vesting is based upon meeting certain various criteria, including continued employment with 1st Source. Stock-based compensation expense relating to the EIP, SDP and RSAP totaled $3.29 million in 2020, $2.76 million in 2019, and $3.55 million in 2018. The total income tax benefit recognized in the accompanying Consolidated Statements of Income related to stock-based compensation was $0.77 million in 2020, $0.65 million in 2019, and $0.86 million in 2018. Unrecognized stock-based compensation expense related to non-vested stock awards (EIP/SDP/RSAP) was $7.63 million at December 31, 2020. At such date, the weighted-average period over which this unrecognized expense was expected to be recognized was 3.44 years. The fair value of non-vested stock awards for the purposes of recognizing stock-based compensation expense is market price of the stock on the measurement date, which, for the Company’s purposes is the date of the award. Employee Stock Purchase Plan — The Company offers an ESPP for substantially all employees with at least two years of service on the effective date of an offering under the plan. Eligible employees may elect to purchase any dollar amount of stock, so long as such amount does not exceed 25% of their base rate of pay and the aggregate stock accrual rate for all offerings does not exceed $25,000 in any calendar year. The purchase price for shares offered is the lower of the closing market bid price for the offering date or the average market bid price for the five business days preceding the offering date. The purchase price and premium/(discount) to the actual market closing price on the offering date for the 2020, 2019, and 2018 offerings were $34.35 (1.78%), $43.81 (0.14%), and $53.84 (-0.09%), respectively. Payment for the stock is made through payroll deductions over the offering period, and employees may discontinue the deductions at any time and exercise the option or take the funds out of the program. The most recent offering began June 1, 2020 and runs through June 1, 2022, with $304,635 in stock value to be purchased at $34.35 per share.

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