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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash dividends on preferred stock, rate	1.06%us-gaap_PreferredStockDividendRatePercentage	2.96%us-gaap_PreferredStockDividendRatePercentage	3.85%us-gaap_PreferredStockDividendRatePercentage
Cash dividends on common stock, per share	$ 0.51us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.42us-gaap_CommonStockDividendsPerShareCashPaid	$ 0.38us-gaap_CommonStockDividendsPerShareCashPaid
Retained Earnings [Member]
Cash dividends on preferred stock, rate	1.06%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	2.96%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	3.85%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Cash dividends on common stock, per share	$ 0.51us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 0.42us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember	$ 0.38us-gaap_CommonStockDividendsPerShareCashPaid / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember

X

- 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

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X

- Definition

The percentage rate used to calculate dividend payments on preferred stock.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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Namespace Prefix:
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