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Condensed Information of Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Financing Receivable, Impaired [Line Items] |  |  |  |
Impaired loans without a valuation allowance | $ 20,965 | [1] | $ 14,292 | [1]
Impaired loans with a valuation allowance | 55,075 | [1] | 63,870 | [1]
Total impaired loans (1) | 76,040 | [1] | 78,162 | [1]
Valuation allowance related to impaired loans | 6,215 |  | 7,125 |
Total non-accrual loans | $ 50,566 | [2] | $ 53,094 | [2]
[1] | Principal balance on Company's books, less any direct charge offs.
[2] | 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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