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STOCK BASED COMPENSATION PLANS - Stock Options Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Number of Stock Options Outstanding |  |
Beginning balance (in shares) | 107,784 | 121,637
Exercised (in shares) | (9,860) | (13,853)
Forfeited (in shares) | (483) |
Expired (in shares) | (2,875) |
Ending balance (in shares) | 94,566 | 107,784
Ending vested and expected to vest (in shares) | 94,566 | 107,784
Exercisable, outstanding (in shares) | 92,956 | 98,460
Weighted Average Exercise Price |  |
Beginning balance (usd per share) | $ 20.15 | $ 19.96
Exercised (usd per share) | 18.42 | 18.44
Forfeited (usd per share) | 16.96 |
Expired (usd per share) | 21.90 |
Ending balance (usd per share) | 20.29 | 20.15
Ending vested and expected to vest (usd per share) | 20.29 | 20.15
Exercisable (usd per share) | $ 20.35 | $ 20.48
Aggregate Intrinsic Value (in thousands) |  |
Value of ending outstanding balance | $ 226 | $ 565
Ending vested and expected to vest | 226 | 565
Exercisable, aggregate intrinsic value | $ 217 | $ 483

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3)-(4) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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