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Bank subsidiary (Details 8) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Allowance for loan losses: |  |  |
Valuation allowance, balance at the beginning of the period | $ 40,646 | $ 41,679 | $ 35,798
Provision for loan losses | 15,009 | 20,894 | 32,000
Charge-offs | 17,749 | 21,927 | 26,119
Valuation allowance, balance at the end of the period | 37,906 | 40,646 | 41,679
Ratio of net charge-offs to average loans outstanding (as a percent) | 0.49% | 0.61% | 0.66%
Real estate loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | 10,733 | 14,276 | 9,526
Other loans |  |  |
Allowance for loan losses: |  |  |
Charge-offs | $ 7,016 | $ 7,651 | $ 16,593

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- Definition Reduction to the allowance for credit losses related to financing receivables deemed uncollectible net of recoveries. + References No definition available. + Details
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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 -URI http://asc.fasb.org/extlink&oid=6965416&loc=SL6953423-111524 -Subparagraph (c)(1) + Details
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- Definition Allowance expensed for the period based on estimated losses to be realized from loan transactions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 9 -Section 04 -Paragraph 11 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Audit and Accounting Guide (AAG) -Number AAG-DEP -Chapter 5 -Paragraph 17 -IssueDate 2006-05-01 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: 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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