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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY    
Cash dividends declared, per share $ 0.19us-gaap_CommonStockDividendsPerShareDeclared $ 0.18us-gaap_CommonStockDividendsPerShareDeclared