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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Statement of Comprehensive Income [Abstract] |  |  |
Unrealized (loss) gain on available-for-sale securities, tax | $ 65 | $ 28 | $ 51
Actuarial gain (loss) on retirement plan, tax | 1,336 | 3,569 | 988
Plan amendment cost | 79 |  |
Amortization of prior service cost and actuarial loss for retirement plan included in net periodic pension costs, tax | $ 1,316 | $ 723 | $ 713

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