falls between performance levels would be interpolated to calculate a proportionate award. For the performance period ending December 31, 2021, the RSUs’ performance goal is based on earnings per share for the year ending December 31, 2021. For the performance period ending December 31, 2022, the RSUs performance goals are based on earnings per share for the year ending December 31, 2022 and growth in tangible book value per share during the performance period. For the performance period ending December 31, 2023, the RSUs performance goals are based on earnings per share for the year ending December 31, 2023 and growth in tangible book value per share during the performance period.
To receive any shares under an RSU, a grantee must be employed by the Corporation or one of its subsidiaries on the applicable vesting date, except that a grantee whose employment terminates prior to such vesting date due to death, disability or retirement will be entitled to a pro-rated portion of the shares subject to the RSUs, assuming that, in the case of performance-vesting RSUs, the performance goals had been met at their "target" levels.
In the first quarter of 2020, RSUs were granted relating to 9,791 performance vesting shares (target level) for 2019 LTIP plan for the performance period ending December 31, 2021 and 10,143 performance vesting shares and 5,070 time vesting shares (target level) for 2020 LTIP plan for the performance period ending December 31, 2022, which had a grant date fair market value of $12.54 per share of common stock underlying each RSU. The 2020 plan has a performance period for the performance-vesting RSUs of three years ending December 31, 2022 and the time-vesting RSUs will vest ratably over a three year period that began on March 26, 2021. On March 26, 2021, 1,690 of the 5,070 time vesting shares were issued to participants. On March 26, 2022, 1,688 shares of the 3,380 remaining time vesting shares were issued to participants. Stock compensation expense was $42,024 and $52,254 for the six month periods ended June 30, 2022 and 2021. Stock compensation expense was $15,896 and $26,127 for the second quarter of 2022 and 2021, respectively. Unrecognized compensation expense at June 30, 2022 related to unvested RSUs was $47,687.
In May 2021, RSUs relating to 7,389 performance vesting shares and 3,693 time vesting shares (target level) for plan year 2021 were granted, which had a grant date fair market value of $17.93 per share of common stock underlying each RSU. The performance period for the performance-vesting RSUs is the three year period ending December 31, 2023. The time-vesting RSUs will vest ratably over a three year period that began on May 5, 2022. On May 5, 2022, 1,230 shares of the 3,693 time-vesting RSUs were issued to participants. Stock compensation expense was $33,142 and $11,048 for the first six months of 2022 and 2021, respectively. Stock compensation expense was $16,571 and $11,048 for the second quarter of 2022 and 2021, respectively. Unrecognized compensation expense as of June 30, 2022 related to unvested units was $121,522.
In March 2022, RSUs relating to 8,096 performance vesting shares and 6,238 time vesting shares (target level) for plan year 2022 were granted, which had a grant date fair market value of $21.88 per share of common stock underlying each RSU. The performance period for the performance-vesting RSUs is the three year period ending December 31, 2024. The time-vesting RSUs will vest ratably over a three year period beginning on March 9, 2023. Stock compensation expense was $26,145 for the six and three month periods ended June 30, 2022. Unrecognized compensation expense as of June 30, 2022 related to unvested units was $287,598.
Note 10 – Derivative Financial Instruments
As a part of managing interest rate risk, the Corporation entered into interest rate swap agreements to modify the re-pricing characteristics of certain interest-bearing liabilities. The Corporation has designated its interest rate swap agreements as cash flow hedges under the guidance of ASC Subtopic 815-30, Derivatives and Hedging – Cash Flow Hedges. Cash flow hedges have the effective portion of changes in the fair value of the derivative, net of taxes, recorded in net accumulated other comprehensive income.
In March 2016, the Corporation entered into 4 interest rate swap contracts totaling $30.0 million notional amount, hedging future cash flows associated with floating rate trust preferred debt. As of June 30, 2022, $20.0 million notional amount remains.
The fair value of the interest rate swap contracts was $0.6 million and $(0.5) million at June 30, 2022 and December 31, 2021, respectively.
For the six months ended June 30, 2022, the Corporation recorded an increase in the value of the derivatives of $1.1 million and the related deferred tax of $0.3 million in net accumulated other comprehensive loss to reflect the effective portion of cash flow