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Loans and allowance for credit losses (Details 1) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 44,489 $ 40,714
Loans collectively evaluated for impairment 659,148 671,205
Total loans 703,637 711,919
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 2,208 783
Loans collectively evaluated for impairment 7,861 9,942
Total allowance for credit losses 10,069 10,725
Construction Loans [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 9,517 5,569
Loans collectively evaluated for impairment 57,295 59,022
Total loans 66,812 64,591
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 341 204
Loans collectively evaluated for impairment 1,656 1,756
Total allowance for credit losses 1,997 1,960
Residential Real Estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 19,791 19,748
Loans collectively evaluated for impairment 250,689 255,109
Total loans 270,480 274,857
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 258 285
Loans collectively evaluated for impairment 1,828 3,569
Total allowance for credit losses 2,086 3,854
Commercial Real Estate [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 14,296 14,462
Loans collectively evaluated for impairment 287,851 290,143
Total loans 302,147 304,605
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 1,510 44
Loans collectively evaluated for impairment 3,074 2,985
Total allowance for credit losses 4,584 3,029
Commercial Loan [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 843 887
Loans collectively evaluated for impairment 53,171 56,308
Total loans 54,014 57,195
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 72 245
Loans collectively evaluated for impairment 605 1,021
Total allowance for credit losses 677 1,266
Consumer Loan [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 42 48
Loans collectively evaluated for impairment 10,142 10,623
Total loans 10,184 10,671
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 27 5
Loans collectively evaluated for impairment 281 238
Total allowance for credit losses 308 243
Unallocated Financing Receivables [Member]
    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 0 0
Total loans 0 0
Allowance for credit losses allocated to:    
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 417 373
Total allowance for credit losses $ 417 $ 373