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Consolidated Statements of Shareholders' Equity (Parentheticals) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Consolidated Statements of Shareholders' Equity (Parenthetical) |  |  |
Tax withholdings for Directors, Employee Benefit and Stock Plans (in shares) | 46,152 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 9,457 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation | 19,664 us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Dividends paid per Common Share (in dollars per share) | $ 0.78 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.72 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.69 us-gaap_CommonStockDividendsPerShareCashPaid

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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer. + References No definition available. + Details
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