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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]            
Unrealized gain (loss) on investment, tax $ (4) $ 39 $ 14 $ 28 $ 4 $ (50)
Dividends per share (usd per share) $ 0.34 $ 0.34 $ 0.34 $ 0.32 $ 0.32 $ 0.32