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Loans and allowance for credit losses (Details 5) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Loan Risk Rating	$ 785,753	$ 785,082
Construction Loans [Member] \| Pass [Member]
Loan Risk Rating	49,924	45,385
Construction Loans [Member] \| Special Mention [Member]
Loan Risk Rating	27,605	30,817
Construction Loans [Member] \| Substandard [Member]
Loan Risk Rating	22,100	22,155
Construction Loans [Member] \| Doubtful [Member]
Loan Risk Rating	0	0
Construction Loans [Member] \| Non Accrual [Member]
Loan Risk Rating	8,457	9,694
Construction Loans [Member]
Loan Risk Rating	108,086	108,051
Residential Real Estate [Member] \| Pass [Member]
Loan Risk Rating	238,085	237,299
Residential Real Estate [Member] \| Special Mention [Member]
Loan Risk Rating	25,033	23,657
Residential Real Estate [Member] \| Substandard [Member]
Loan Risk Rating	14,950	15,090
Residential Real Estate [Member] \| Doubtful [Member]
Loan Risk Rating	75	433
Residential Real Estate [Member] \| Non Accrual [Member]
Loan Risk Rating	11,595	11,532
Residential Real Estate [Member]
Loan Risk Rating	289,738	288,011
Commercial Real Estate [Member] \| Pass [Member]
Loan Risk Rating	264,320	257,418
Commercial Real Estate [Member] \| Special Mention [Member]
Loan Risk Rating	22,831	21,554
Commercial Real Estate [Member] \| Substandard [Member]
Loan Risk Rating	21,099	21,402
Commercial Real Estate [Member] \| Doubtful [Member]
Loan Risk Rating	0	0
Commercial Real Estate [Member] \| Non Accrual [Member]
Loan Risk Rating	11,114	14,567
Commercial Real Estate [Member]
Loan Risk Rating	319,364	314,941
Commercial Loan [Member] \| Pass [Member]
Loan Risk Rating	50,704	55,432
Commercial Loan [Member] \| Special Mention [Member]
Loan Risk Rating	3,335	3,062
Commercial Loan [Member] \| Substandard [Member]
Loan Risk Rating	1,645	1,639
Commercial Loan [Member] \| Doubtful [Member]
Loan Risk Rating	0	59
Commercial Loan [Member] \| Non Accrual [Member]
Loan Risk Rating	587	594
Commercial Loan [Member]
Loan Risk Rating	56,271	60,786
Consumer Loan [Member] \| Pass [Member]
Loan Risk Rating	12,178	13,147
Consumer Loan [Member] \| Special Mention [Member]
Loan Risk Rating	53	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	60	87
Consumer Loan [Member]
Loan Risk Rating	12,294	13,293
Pass [Member]
Loan Risk Rating	615,211	608,681
Special Mention [Member]
Loan Risk Rating	78,857	79,090
Substandard [Member]
Loan Risk Rating	59,797	60,345
Doubtful [Member]
Loan Risk Rating	75	492
Non Accrual [Member]
Loan Risk Rating	$ 31,813	$ 36,474