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Loans and allowance for credit losses (Details 7) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Allowance for credit losses: |  |  |  |
Beginning balance | $ 15,723 | $ 12,990 | $ 15,991 | $ 14,288
Charge-offs | (27,019) | (6,391) | (32,649) | (19,902)
Recoveries | 137 | 156 | 649 | 474
Net charge-offs | (26,882) | (6,235) | (32,000) | (19,428)
Provision | 22,460 | 6,200 | 27,310 | 18,095
Ending balance | 11,301 | 12,955 | 11,301 | 12,955
Unallocated Financing Receivables [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 87 | 408 | 187 | 22
Charge-offs | 0 | 0 | 0 | 0
Recoveries | 0 | 0 | 0 | 0
Net charge-offs | 0 | 0 | 0 | 0
Provision | 384 | (408) | 284 | (22)
Ending balance | 471 | 0 | 471 | 0
Commercial Loan [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 1,216 | 1,063 | 1,682 | 1,498
Charge-offs | (196) | (73) | (419) | (4,513)
Recoveries | 47 | 22 | 149 | 230
Net charge-offs | (149) | (51) | (270) | (4,283)
Provision | 205 | 524 | (140) | 4,321
Ending balance | 1,272 | 1,536 | 1,272 | 1,536
Consumer Loan [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 301 | 304 | 407 | 594
Charge-offs | (3) | (31) | (65) | (208)
Recoveries | 16 | 8 | 33 | 17
Net charge-offs | 13 | (23) | (32) | (191)
Provision | (44) | (158) | (105) | (99)
Ending balance | 270 | 304 | 270 | 304
Residential Real Estate [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 4,259 | 4,237 | 5,194 | 5,014
Charge-offs | (4,225) | (2,323) | (6,114) | (7,996)
Recoveries | 51 | 5 | 349 | 99
Net charge-offs | (4,174) | (2,318) | (5,765) | (7,897)
Provision | 3,645 | 2,268 | 4,301 | 7,070
Ending balance | 3,730 | 4,187 | 3,730 | 4,187
Commercial Real Estate [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 5,514 | 3,952 | 4,134 | 3,415
Charge-offs | (4,056) | (742) | (6,003) | (2,177)
Recoveries | 20 | 116 | 113 | 123
Net charge-offs | (4,036) | (626) | (5,890) | (2,054)
Provision | 2,090 | 275 | 5,324 | 2,240
Ending balance | 3,568 | 3,601 | 3,568 | 3,601
Construction Loans [Member] |  |  |  |
Allowance for credit losses: |  |  |  |
Beginning balance | 4,346 | 2,845 | 4,387 | 3,745
Charge-offs | (18,539) | (3,222) | (20,048) | (5,008)
Recoveries | 3 | 5 | 5 | 5
Net charge-offs | (18,536) | (3,217) | (20,043) | (5,003)
Provision | 16,180 | 3,699 | 17,646 | 4,585
Ending balance | $ 1,990 | $ 3,327 | $ 1,990 | $ 3,327

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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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