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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Options exercised, shares | 435,665 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 1,158,537 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 389,089 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
Conversion of common stock units, shares | 10,834 hmn_StockIssuedDuringPeriodSharesConversionOfCommonStockUnits | 11,851 hmn_StockIssuedDuringPeriodSharesConversionOfCommonStockUnits | 15,084 hmn_StockIssuedDuringPeriodSharesConversionOfCommonStockUnits
Conversion of restricted stock units, shares | 169,444 hmn_StockIssuedDuringPeriodSharesConversionOfRestrictedStockUnits | 146,930 hmn_StockIssuedDuringPeriodSharesConversionOfRestrictedStockUnits | 104,152 hmn_StockIssuedDuringPeriodSharesConversionOfRestrictedStockUnits
Cash dividends, per share | $ 0.92 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.78 us-gaap_CommonStockDividendsPerShareCashPaid | $ 0.55 us-gaap_CommonStockDividendsPerShareCashPaid
Treasury stock, beginning balance, shares | 23,117,554 us-gaap_TreasuryStockShares | 22,943,925 us-gaap_TreasuryStockShares | 22,028,030 us-gaap_TreasuryStockShares
Treasury stock, acquisition of shares | 190,876 us-gaap_TreasuryStockSharesAcquired | 173,629 us-gaap_TreasuryStockSharesAcquired | 915,895 us-gaap_TreasuryStockSharesAcquired
Treasury stock, ending balance, shares | 23,308,430 us-gaap_TreasuryStockShares | 23,117,554 us-gaap_TreasuryStockShares | 22,943,925 us-gaap_TreasuryStockShares

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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 Number of share options (or share units) exercised during the current period. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: 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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.28,29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares that have been repurchased during the period and are being held in treasury. + 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 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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