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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Common stock, cash dividends, per share, declared $ 0.22us-gaap_CommonStockDividendsPerShareDeclared $ 0.21us-gaap_CommonStockDividendsPerShareDeclared
Retained earnings    
Common stock, cash dividends, per share, declared $ 0.22us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 0.21us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember