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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

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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The increase (decrease) in the allowance for credit losses related to financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 + Details
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- Definition The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Paragraph 168, 169, 170 -IssueDate 2006-05-01 -Chapter 5 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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