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Unaudited Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Cash dividends declared per share $ 0.29 $ 0.27 $ 0.58 $ 0.53
Retained Earnings Substantially Restricted        
Cash dividends declared per share $ 0.29 $ 0.27 $ 0.58 $ 0.53