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Credit Quality and Nonperforming Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loan, classified as troubled debt restructuring | $ 51.6 |
Loan, classified as troubled debt restructuring, non-accrual status | $ 31.8 |
Loans Accruals Due | 90 days | 90 days

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- Definition Financing Receivable Average Investment Nonaccrual Loans + References No definition available. + Details
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Balance Type: | debit
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- Definition Loans Accruals Due. + References No definition available. + Details
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- Details
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Namespace Prefix: | us-gaap_
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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=6951948&loc=d3e18845-111554 + Details
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