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Loans and allowance for credit losses (Details 7) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012
Allowance for credit losses: |  |  |  |
Beginning balance | $ 15,735 | $ 13,544 | $ 15,991 | $ 14,288
Charge-offs | (2,919) | (4,260) | (5,630) | (13,511)
Recoveries | 207 | 181 | 512 | 318
Net charge-offs | (2,712) | (4,079) | (5,118) | (13,193)
Provision | 2,700 | 3,525 | 4,850 | 11,895
Ending balance | 15,723 | 12,990 | 15,723 | 12,990
Unallocated Financing Receivables [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 291 | 83 | 187 | 22
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | 0 | 0 | 0 | 0
Provision | (204) | 325 | (100) | 386
Ending balance | 87 | 408 | 87 | 408
Commercial Loan [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 1,760 | 1,539 | 1,682 | 1,498
Charge-offs | (136) | (1,085) | (223) | (4,440)
Recoveries | 50 | 133 | 102 | 208
Net charge-offs | (86) | (952) | (121) | (4,232)
Provision | (458) | 476 | (345) | 3,797
Ending balance | 1,216 | 1,063 | 1,216 | 1,063
Consumer Loan [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 330 | 581 | 407 | 594
Charge-offs | (13) | (162) | (62) | (177)
Recoveries | 7 | 5 | 17 | 9
Net charge-offs | (6) | (157) | (45) | (168)
Provision | (23) | 61 | (61) | 59
Ending balance | 301 | 485 | 301 | 485
Residential Real Estate [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 4,864 | 4,448 | 5,194 | 5,014
Charge-offs | (1,096) | (1,554) | (1,889) | (5,673)
Recoveries | 59 | 43 | 298 | 94
Net charge-offs | (1,037) | (1,511) | (1,591) | (5,579)
Provision | 432 | 1,300 | 656 | 4,802
Ending balance | 4,259 | 4,237 | 4,259 | 4,237
Commercial Real Estate [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 4,374 | 3,549 | 4,134 | 3,415
Charge-offs | (872) | (745) | (1,947) | (1,435)
Recoveries | 90 | 0 | 93 | 7
Net charge-offs | (782) | (745) | (1,854) | (1,428)
Provision | 1,922 | 1,148 | 3,234 | 1,965
Ending balance | 5,514 | 3,952 | 5,514 | 3,952
Construction Loans [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 4,116 | 3,344 | 4,387 | 3,745
Charge-offs | (802) | (714) | (1,509) | (1,786)
Recoveries | 1 | 0 | 2 | 0
Net charge-offs | (801) | (714) | (1,507) | (1,786)
Provision | 1,031 | 215 | 1,466 | 886
Ending balance | $ 4,346 | $ 2,845 | $ 4,346 | $ 2,845

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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=28368275&loc=SL6953423-111524 + Details
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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=28368275&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=28368275&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=28368275&loc=SL6953423-111524 + Details
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- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 9 Reference 3: 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=28368275&loc=SL6953423-111524 Reference 4: 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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