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Loans - Summary of Interest Foregone on Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Receivables [Abstract] |  |  |
Interest Income That Would Have Been Recognized Had Impaired Loans Performed in Accordance with Their Original Terms | $ 1,068 | $ 1,428 |
Less: Interest Income Recognized on Impaired Loans | (896) | (1,106) | (4,541)
Interest Foregone on Impaired Loans | $ 172 | $ 322 |

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- Definition Loans and leases receivable impaired interest income not recognized. + References No definition available. + Details
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- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524 + Details
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