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

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- Definition Amount before allowance of commercial loans and leases receivable includes, but not limited to, commercial and industrial loans, agricultural loans, mortgage loans, promissory notes, interbank and other loans to financial institutions, draws against credit facilities, trade financing, lease financings. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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