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Condensed Consolidated Statements of Changes to Stockholder's Equity (Parenthetical) (Unaudited) - $ / shares
3 Months Ended
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Mar. 31, 2018
Cash dividends declared, per share $ 0.15 $ 0.15 $ 0.14 $ 0.13
Common Stock [Member]        
Issuance of shares of restricted stock, Shares 37,700 400 32,900 100
Issuance of shares of restricted stock, forfeitures 300 2,040 2,020  
Issuance of shares of common stock in acquisition   1,830,000