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Derivative Financial Instruments (Details 2) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Derivative in fair value hedging relationship [Member] |  |  |
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship |  |  |
Location of gain (loss) recognized on derivative |  |  |
Interest Rate Contracts One [Member] | Derivative in fair value hedging relationship [Member] | Interest Income [Member] |  |  |
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship |  |  |
Location of gain (loss) recognized on derivative | 28 | 147 | 898
Interest Rate Contracts Two [Member] | Derivative in fair value hedging relationship [Member] | Interest Income [Member] |  |  |
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship |  |  |
Location of gain (loss) recognized on derivative | (28) | (147) | (898)
Derivatives not designated as hedging instruments [Member] | Mortgage contracts [Member] | Other income - gain on sale of loans [Member] |  |  |
Effect of the derivative instruments on the consolidated statement of income Derivative in fair value hedging relationship |  |  |
Location of gain (loss) recognized on derivative | $ 196 | $ 255 | $ (538)

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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