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Loans and allowance for credit losses (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]    
Construction $ 66,812 $ 64,591
Residential real estate 270,480 274,857
Commercial real estate 302,147 304,605
Commercial 54,014 57,195
Consumer 10,184 10,671
Total loans 703,637 711,919
Allowance for credit losses (10,069) (10,725)
Total loans, net $ 693,568 $ 701,194