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Investment securities (Details Textual) (USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Available-For-Sale Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Pledged Assets Separately Reported, Securities Pledged As Collateral, At Fair Value | $ 307.5 us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember | $ 296.8 us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_AvailableforsaleSecuritiesMember
Held-To-Maturity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Pledged Assets Separately Reported, Securities Pledged As Collateral, At Fair Value | $ 13.0 us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember | $ 13.0 us-gaap_PledgedAssetsSeparatelyReportedSecuritiesPledgedAsCollateralAtFairValue / us-gaap_InformationByCategoryOfDebtSecurityAxis = us-gaap_HeldtomaturitySecuritiesMember

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- Definition The sum of the fair values, as of the date of each statement of financial position presented, of securities that are restricted as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and that are reclassified and separately reported in the statement of financial position because the transferee has the right by contract or custom to sell or re-pledge them. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6467456&loc=d3e113888-111728 + Details
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