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Loans and allowance for credit losses (Details 5) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Loan Risk Rating | $ 782,188 | $ 785,082
Pass [Member] |  |
Loan Risk Rating | 613,470 | 608,681
Special Mention [Member] |  |
Loan Risk Rating | 75,945 | 79,090
Substandard [Member] |  |
Loan Risk Rating | 57,955 | 60,345
Doubtful [Member] |  |
Loan Risk Rating | 0 | 492
Non Accrual [Member] |  |
Loan Risk Rating | 34,818 | 36,474
Commercial Loan [Member] |  |
Loan Risk Rating | 56,448 | 60,786
Commercial Loan [Member] | Pass [Member] |  |
Loan Risk Rating | 50,938 | 55,432
Commercial Loan [Member] | Special Mention [Member] |  |
Loan Risk Rating | 4,097 | 3,062
Commercial Loan [Member] | Substandard [Member] |  |
Loan Risk Rating | 811 | 1,639
Commercial Loan [Member] | Doubtful [Member] |  |
Loan Risk Rating | 0 | 59
Commercial Loan [Member] | Non Accrual [Member] |  |
Loan Risk Rating | 602 | 594
Consumer Loan [Member] |  |
Loan Risk Rating | 11,539 | 13,293
Consumer Loan [Member] | Pass [Member] |  |
Loan Risk Rating | 11,433 | 13,147
Consumer Loan [Member] | Special Mention [Member] |  |
Loan Risk Rating | 52 | 0
Consumer Loan [Member] | Substandard [Member] |  |
Loan Risk Rating | 3 | 59
Consumer Loan [Member] | Doubtful [Member] |  |
Loan Risk Rating | 0 | 0
Consumer Loan [Member] | Non Accrual [Member] |  |
Loan Risk Rating | 51 | 87
Residential Real Estate [Member] |  |
Loan Risk Rating | 288,494 | 288,011
Residential Real Estate [Member] | Pass [Member] |  |
Loan Risk Rating | 235,008 | 237,299
Residential Real Estate [Member] | Special Mention [Member] |  |
Loan Risk Rating | 24,055 | 23,657
Residential Real Estate [Member] | Substandard [Member] |  |
Loan Risk Rating | 13,398 | 15,090
Residential Real Estate [Member] | Doubtful [Member] |  |
Loan Risk Rating | 0 | 433
Residential Real Estate [Member] | Non Accrual [Member] |  |
Loan Risk Rating | 16,033 | 11,532
Commercial Real Estate [Member] |  |
Loan Risk Rating | 321,191 | 314,941
Commercial Real Estate [Member] | Pass [Member] |  |
Loan Risk Rating | 268,053 | 257,418
Commercial Real Estate [Member] | Special Mention [Member] |  |
Loan Risk Rating | 23,752 | 21,554
Commercial Real Estate [Member] | Substandard [Member] |  |
Loan Risk Rating | 18,749 | 21,402
Commercial Real Estate [Member] | Doubtful [Member] |  |
Loan Risk Rating | 0 | 0
Commercial Real Estate [Member] | Non Accrual [Member] |  |
Loan Risk Rating | 10,637 | 14,567
Construction Loans [Member] |  |
Loan Risk Rating | 104,516 | 108,051
Construction Loans [Member] | Pass [Member] |  |
Loan Risk Rating | 48,038 | 45,385
Construction Loans [Member] | Special Mention [Member] |  |
Loan Risk Rating | 23,989 | 30,817
Construction Loans [Member] | Substandard [Member] |  |
Loan Risk Rating | 24,994 | 22,155
Construction Loans [Member] | Doubtful [Member] |  |
Loan Risk Rating | 0 | 0
Construction Loans [Member] | Non Accrual [Member] |  |
Loan Risk Rating | $ 7,495 | $ 9,694

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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 + Details
Name: | us-gaap_LoansAndLeasesReceivableGrossCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant