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Short-term Borrowings - Interest Expense on Short-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Interest On Short Term Borrowings [Line Items] |  |  |
Total interest on short-term borrowings | $ 1,070 | $ 728 | $ 1,948
Federal funds purchased [Member] |  |  |
Interest On Short Term Borrowings [Line Items] |  |  |
Total interest on short-term borrowings | 128 | 41 | 105
Borrowings from FHLB [Member] |  |  |
Interest On Short Term Borrowings [Line Items] |  |  |
Total interest on short-term borrowings | 545 | 16 | 1,069
Securities sold under agreements to repurchase [Member] |  |  |
Interest On Short Term Borrowings [Line Items] |  |  |
Total interest on short-term borrowings | $ 397 | $ 671 | $ 774

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- Definition The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 7 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher OTS -Name Federal Regulation (FR) -Number Title 12 -Section 563c.102 -Paragraph 7 -Chapter V -Subsection II -LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy. + Details
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