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Impaired Loans, Condensed Information Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
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Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans without a valuation allowance | $ 35,937 | [1] | $ 49,625 | [1]
Impaired loans with a valuation allowance | 47,266 | [1] | 48,704 | [1]
Total impaired loans | 83,203 | [1],[2] | 98,329 | [1],[2]
Valuation allowance related to impaired loans | 7,671 |  | 8,754 |
Total non-accrual loans | 36,715 | [3] | 56,110 | [3]
Total loans past-due ninety days or more and still accruing |  |  | $ 48 |
[1] | Principal balance on Company's books, less any direct charge offs.
[2] | Principal balance on Company's books less any direct charge-off
[3] | Included in Total Financing Receivables

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5111-111524 + Details
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- Definition 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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- Definition Amount of investment in impaired financing receivables for which there is no 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 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
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