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Loans and allowance for credit losses (Details 6) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Current $ 742,485 $ 741,925
30-59 days past due 7,889 4,576
60-89 days past due 3,544 1,647
90 days or more past due 22 460
Total past due 11,455 6,683
Nonaccrual 31,813 36,474
Total loans 785,753 785,082
Current 94.50% 94.50%
30-59 days past due 1.00% 0.60%
60-89 days past due 0.50% 0.20%
90 days or more past due 0.00% 0.10%
Total past due 1.50% 0.90%
Non accrual 4.00% 4.60%
Construction Loans [Member]
    
Current 99,493 98,221
30-59 days past due 136 136
60-89 days past due 0 0
90 days or more past due 0 0
Total past due 136 136
Nonaccrual 8,457 9,694
Total loans 108,086 108,051
Residential Real Estate [Member]
    
Current 272,277 272,311
30-59 days past due 4,789 3,116
60-89 days past due 1,055 762
90 days or more past due 22 290
Total past due 5,866 4,168
Nonaccrual 11,595 11,532
Total loans 289,738 288,011
Commercial Real Estate [Member]
    
Current 303,535 298,522
30-59 days past due 2,334 887
60-89 days past due 2,381 800
90 days or more past due 0 165
Total past due 4,715 1,852
Nonaccrual 11,114 14,567
Total loans 319,364 314,941
Commercial Loan [Member]
    
Current 54,988 59,746
30-59 days past due 588 380
60-89 days past due 108 66
90 days or more past due 0 0
Total past due 696 446
Nonaccrual 587 594
Total loans 56,271 60,786
Consumer Loan [Member]
    
Current 12,192 13,125
30-59 days past due 42 57
60-89 days past due 0 19
90 days or more past due 0 5
Total past due 42 81
Nonaccrual 60 87
Total loans $ 12,294 $ 13,293