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Consolidated Statements of Changes in Stockholders Equity (Parenthetical) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Issuance of restricted stock $ 1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross   $ 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
Common stock, dividends per share (in USD per share) $ 1.60us-gaap_CommonStockDividendsPerShareCashPaid $ 1.60us-gaap_CommonStockDividendsPerShareCashPaid $ 1.60us-gaap_CommonStockDividendsPerShareCashPaid
Common Stock [Member]      
Issuance of restricted stock $ 1us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 [1] $ 0us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
[1] Rounds to zero.