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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

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5258-111524 + Details
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- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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