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Short-term Borrowings - Summary of Short-Term Borrowings (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 356,227 | $ 312,777 | $ 187,861
Average Balance | 402,196 | 182,864 | 488,078
Average Rate | 0.27% | 0.40% | 0.40%
Federal funds purchased [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | 34,000 | 75,300 | 12,800
Average Balance | 47,727 | 15,642 | 40,322
Average Rate | 0.27% | 0.26% | 0.26%
Borrowings from FHLB [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | 178,100 | 84,000 | 0
Average Balance | 214,703 | 7,537 | 277,329
Average Rate | 0.25% | 0.21% | 0.39%
Securities sold under agreements to repurchase [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | 144,127 | 153,477 | 170,563
Average Balance | 139,766 | 155,551 | 165,945
Average Rate | 0.28% | 0.43% | 0.47%
Treasury, tax and loan note option [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | 0 | 0 | 4,498
Average Balance | 0 | 4,134 | 4,482
Average Rate | 0.00% | 0.00% | 0.00%
Weighted average [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Average Rate | 0.25% | 0.28% | 0.43%
Maximum [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Ending Balance | $ 486,144 | $ 312,777 | $ 1,000,753

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- Definition Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.(a),16(a)(1)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Subparagraph a(1) -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 13 -Subparagraph 2, 3 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period. + References No definition available. + Details
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- Definition Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of short-term debt outstanding by type or by instrument at that time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph b -Article 5 + Details
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