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Bank segment - Credit risk profile - assigned grades (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Credit risk profile by internally assigned grade for loans    
Commercial real estate $ 561,189us-gaap_LoansReceivableCommercialRealEstate $ 531,917us-gaap_LoansReceivableCommercialRealEstate
Commercial construction 77,164us-gaap_LoansReceivableCommercialConstruction 96,438us-gaap_LoansReceivableCommercialConstruction
Commercial 803,545us-gaap_LoansAndLeasesReceivableCommercial 791,757us-gaap_LoansAndLeasesReceivableCommercial
Pass    
Credit risk profile by internally assigned grade for loans    
Commercial real estate 507,993us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 493,105us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial construction 77,164us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 79,312us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Commercial 739,721us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember		 743,334us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_PassMember
Special mention    
Credit risk profile by internally assigned grade for loans    
Commercial real estate 5,203us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 5,209us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial construction 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Commercial 31,863us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember		 16,095us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SpecialMentionMember
Substandard    
Credit risk profile by internally assigned grade for loans    
Commercial real estate 47,993us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 33,603us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial construction 0us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 17,126us-gaap_LoansReceivableCommercialConstruction
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Commercial 31,335us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember		 31,665us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_SubstandardMember
Doubtful    
Credit risk profile by internally assigned grade for loans    
Commercial real estate 0us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 0us-gaap_LoansReceivableCommercialRealEstate
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember
Commercial $ 626us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember		 $ 663us-gaap_LoansAndLeasesReceivableCommercial
/ us-gaap_InternalCreditAssessmentAxis
= us-gaap_DoubtfulMember