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Loans and allowance for credit losses (Details 5) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | $ 703,637 | $ 711,919
Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 66,812 | 64,591
Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 270,480 | 274,857
Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 302,147 | 304,605
Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 54,014 | 57,195
Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 10,184 | 10,671
Pass [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 585,401 | 592,085
Pass [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 39,893 | 39,268
Pass [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 235,953 | 235,054
Pass [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 250,195 | 255,280
Pass [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 49,265 | 52,032
Pass [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 10,095 | 10,451
Special Mention [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 74,629 | 72,366
Special Mention [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 15,871 | 15,884
Special Mention [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 23,263 | 22,638
Special Mention [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 31,651 | 30,105
Special Mention [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 3,797 | 3,691
Special Mention [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 47 | 48
Substandard [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 43,017 | 46,907
Substandard [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 11,048 | 9,439
Substandard [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 11,264 | 17,114
Substandard [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 20,301 | 19,210
Substandard [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 362 | 972
Substandard [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 42 | 172
Doubtful [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 590 | 561
Doubtful [Member] | Construction Loans [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 0 | 0
Doubtful [Member] | Residential Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 0 | 51
Doubtful [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 0 | 10
Doubtful [Member] | Commercial Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | 590 | 500
Doubtful [Member] | Consumer Loan [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Loan Risk Rating | $ 0 | $ 0

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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
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