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INCOME TAXES - Additional Information (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
INCOME TAXES |  |  |  |  |  |  |  |  |  |  |
Income tax expense | $ 6,071,000 | $ 5,377,000 | $ 4,448,000 | $ 3,643,000 | $ 5,431,000 | $ 5,119,000 | $ 5,409,000 | $ 4,379,000 | $ 19,539,000 | $ 20,338,000 | $ 18,533,000
Statutory percentage rate of provision |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
Deferred Tax Assets Unrealized Gain Losses On Available for Sale Securities Gross | (7,800,000) |  |  |  | (3,600,000) |  |  |  | $ (7,800,000) | $ (3,600,000) |
Deferred Tax Liabilities Allocated To Benefit Plan | $ 476,000 |  |  |  | $ 512,000 |  |  |  | $ 476,000 | $ 512,000 |
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount |  |  |  |  |  |  |  |  |  |  | $ (408,000)

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from unrealized gain losses on available-for-sale securities. + References No definition available. + Details
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