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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended				12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Dividend reinvestment plan, shares					58,309us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan	63,349us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan	90,110us-gaap_StockIssuedDuringPeriodSharesDividendReinvestmentPlan
Stock purchase and compensation plans, shares					769,389us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	862,662us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation	857,403us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation
Dividends to stockholders, per share	$ 0.14us-gaap_CommonStockDividendsPerShareDeclared	[1]	$ 0.13us-gaap_CommonStockDividendsPerShareDeclared	[1]	$ 0.53us-gaap_CommonStockDividendsPerShareDeclared	$ 0.52us-gaap_CommonStockDividendsPerShareDeclared	$ 0.52us-gaap_CommonStockDividendsPerShareDeclared
Acquisition of treasury stock, shares					154,559us-gaap_TreasuryStockSharesAcquired	167,846us-gaap_TreasuryStockSharesAcquired	194,575us-gaap_TreasuryStockSharesAcquired
Preferred stock, par value per share	$ 0us-gaap_PreferredStockParOrStatedValuePerShare		$ 0us-gaap_PreferredStockParOrStatedValuePerShare		$ 0us-gaap_PreferredStockParOrStatedValuePerShare	$ 0us-gaap_PreferredStockParOrStatedValuePerShare	$ 0us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized		5,000,000us-gaap_PreferredStockSharesAuthorized		5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued	0us-gaap_PreferredStockSharesIssued		0us-gaap_PreferredStockSharesIssued		0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued	0us-gaap_PreferredStockSharesIssued
Series A Preferred Stock [Member]
Preferred stock, par value per share	$ 0us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember		$ 0us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember		$ 0us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember	$ 0us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember	$ 0us-gaap_PreferredStockParOrStatedValuePerShare / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember
Preferred stock, shares authorized	300,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember		300,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember		300,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember	300,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember	300,000us-gaap_PreferredStockSharesAuthorized / us-gaap_StatementEquityComponentsAxis = us-gaap_SeriesAPreferredStockMember
[1] 1 See Note 20. “Statutory Financial Information, Capital Requirements, and Restrictions on Dividends and Transfers of Funds” for a discussion of dividend restrictions.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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