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Loans and allowance for credit losses (Details 2) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Unpaid principal balance $ 101,268 $ 105,779
Recorded investment with no allowance 63,030 77,664
Recorded investment with an allowance 21,328 11,163
Related allowance 1,459 2,201
Year-to-date average recorded investment 83,671 87,064
Construction Loans [Member]
    
Unpaid principal balance 39,468 41,623
Recorded investment with no allowance 26,588 30,706
Recorded investment with an allowance 9,091 6,323
Related allowance 561 941
Year-to-date average recorded investment 35,312 33,621
Residential Real Estate [Member]
    
Unpaid principal balance 25,701 24,992
Recorded investment with no allowance 17,462 16,486
Recorded investment with an allowance 1,478 2,063
Related allowance 263 598
Year-to-date average recorded investment 17,944 22,536
Commercial Real Estate [Member]
    
Unpaid principal balance 34,323 37,395
Recorded investment with no allowance 18,262 29,718
Recorded investment with an allowance 10,715 2,729
Related allowance 591 614
Year-to-date average recorded investment 29,699 29,227
Commercial Loan [Member]
    
Unpaid principal balance 1,711 1,677
Recorded investment with no allowance 662 715
Recorded investment with an allowance 40 0
Related allowance 40 0
Year-to-date average recorded investment 670 1,625
Consumer Loan [Member]
    
Unpaid principal balance 65 92
Recorded investment with no allowance 56 39
Recorded investment with an allowance 4 48
Related allowance 4 48
Year-to-date average recorded investment 46 55
Impaired Nonaccrual Loans [Member] | Construction Loans [Member]
    
Unpaid principal balance 12,246 14,288
Recorded investment with no allowance 4,296 3,371
Recorded investment with an allowance 4,161 6,323
Related allowance 416 941
Year-to-date average recorded investment 8,106 12,428
Impaired Nonaccrual Loans [Member] | Residential Real Estate [Member]
    
Unpaid principal balance 18,356 17,975
Recorded investment with no allowance 10,955 9,469
Recorded investment with an allowance 640 2,063
Related allowance 218 598
Year-to-date average recorded investment 10,786 17,472
Impaired Nonaccrual Loans [Member] | Commercial Real Estate [Member]
    
Unpaid principal balance 16,460 19,515
Recorded investment with no allowance 8,237 11,838
Recorded investment with an allowance 2,877 2,729
Related allowance 475 614
Year-to-date average recorded investment 11,885 12,975
Impaired Nonaccrual Loans [Member] | Commercial Loan [Member]
    
Unpaid principal balance 1,596 1,556
Recorded investment with no allowance 547 594
Recorded investment with an allowance 40 0
Related allowance 40 0
Year-to-date average recorded investment 552 1,538
Impaired Nonaccrual Loans [Member] | Consumer Loan [Member]
    
Unpaid principal balance 65 92
Recorded investment with no allowance 56 39
Recorded investment with an allowance 4 48
Related allowance 4 48
Year-to-date average recorded investment 46 55
Impaired Nonaccrual Loans [Member]
    
Unpaid principal balance 48,723 53,426
Recorded investment with no allowance 24,091 25,311
Recorded investment with an allowance 7,722 11,163
Related allowance 1,153 2,201
Year-to-date average recorded investment 31,375 44,468
Impaired Accruing Restructured Loans [Member] | Construction Loans [Member]
    
Unpaid principal balance 27,222 27,335
Recorded investment with no allowance 22,292 27,335
Recorded investment with an allowance 4,930 0
Related allowance 145 0
Year-to-date average recorded investment 27,206 21,193
Impaired Accruing Restructured Loans [Member] | Residential Real Estate [Member]
    
Unpaid principal balance 7,345 7,017
Recorded investment with no allowance 6,507 7,017
Recorded investment with an allowance 838 0
Related allowance 45 0
Year-to-date average recorded investment 7,158 5,064
Impaired Accruing Restructured Loans [Member] | Commercial Real Estate [Member]
    
Unpaid principal balance 17,863 17,880
Recorded investment with no allowance 10,025 17,880
Recorded investment with an allowance 7,838 0
Related allowance 116 0
Year-to-date average recorded investment 17,814 16,252
Impaired Accruing Restructured Loans [Member] | Commercial Loan [Member]
    
Unpaid principal balance 115 121
Recorded investment with no allowance 115 121
Recorded investment with an allowance 0 0
Related allowance 0 0
Year-to-date average recorded investment 118 87
Impaired Accruing Restructured Loans [Member] | Consumer Loan [Member]
    
Unpaid principal balance 0 0
Recorded investment with no allowance 0 0
Recorded investment with an allowance 0 0
Related allowance 0 0
Year-to-date average recorded investment 0 0
Impaired Accruing Restructured Loans [Member]
    
Unpaid principal balance 52,545 52,353
Recorded investment with no allowance 38,939 52,353
Recorded investment with an allowance 13,606 0
Related allowance 306 0
Year-to-date average recorded investment $ 52,296 $ 42,596