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