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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dividends $ 0.44us-gaap_CommonStockDividendsPerShareCashPaid $ 0.44000us-gaap_CommonStockDividendsPerShareCashPaid  
Retained Earnings      
Dividends $ 0.44us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 0.44us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 0.44us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember