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Disclosures about fair value of assets and liabilities (Details 3) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income |  |  |
Non Interest Income | $ 196 | $ 255 | $ (538)
Hedged loans [Member] |  |  |
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income |  |  |
Non Interest Income | 28 | 147 | 898
Fair value interest rate swap agreements [Member] |  |  |
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income |  |  |
Non Interest Income | (28) | (147) | (898)
Derivative loan commitments [Member] |  |  |
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income |  |  |
Non Interest Income | $ 196 | $ 255 | $ (538)

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- Definition This item represents the amount of the total realized and unrealized gains or losses for the period which are included in the statement of income (or changes in net assets) in trading revenues; the fair value of which assets was or is measured on a recurring basis using significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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