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Credit Quality and Nonperforming Assets - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan, classified as troubled debt restructuring | $ 43,800,000 |
Loan, classified as troubled debt restructuring, non-accrual status | 26,100,000 |
Loans Accruals Due | 90 days | 90 days
Finance lease loans over 90 days past due and still accruing | $ 2,122 |

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554 + Details
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