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Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) - $ / shares
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Cash dividends, per share $ 0.275 $ 0.275
Common Stock [Member]    
Issuance of shares of common stock to Riverview's Dividend Reinvestment, 401k and ESPP Plans 15,390  
Issuance of shares of common stock to the ESPP   1,024