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Loans and allowance for credit losses (Details 7) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Allowance for credit losses:    
Beginning balance $ 15,991 $ 14,288
Charge-offs (2,711) (9,251)
Recoveries 305 137
Net charge-offs (2,406) (9,114)
Provision 2,150 8,370
Ending balance 15,735 13,544
Construction Loans [Member]
    
Allowance for credit losses:    
Beginning balance 4,387 3,745
Charge-offs (707) (1,072)
Recoveries 1 0
Net charge-offs (706) (1,072)
Provision 435 671
Ending balance 4,116 3,344
Residential Real Estate [Member]
    
Allowance for credit losses:    
Beginning balance 5,194 5,014
Charge-offs (793) (4,119)
Recoveries 239 51
Net charge-offs (554) (4,068)
Provision 224 3,502
Ending balance 4,864 4,448
Commercial Real Estate [Member]
    
Allowance for credit losses:    
Beginning balance 4,134 3,415
Charge-offs (1,075) (690)
Recoveries 3 7
Net charge-offs (1,072) (683)
Provision 1,312 817
Ending balance 4,374 3,549
Commercial Loan [Member]
    
Allowance for credit losses:    
Beginning balance 1,682 1,498
Charge-offs (87) (3,355)
Recoveries 52 75
Net charge-offs (35) (3,280)
Provision 113 3,321
Ending balance 1,760 1,539
Consumer Loan [Member]
    
Allowance for credit losses:    
Beginning balance 407 594
Charge-offs (49) (15)
Recoveries 10 4
Net charge-offs (39) (11)
Provision (38) (2)
Ending balance 330 581
Unallocated Financing Receivables [Member]
    
Allowance for credit losses:    
Beginning balance 187 22
Charge-offs 0 0
Recoveries 0 0
Net charge-offs 0 0
Provision 104 61
Ending balance $ 291 $ 83