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Loans - Weighted Average Risk Grades for All Commercial Loans by Class (Detail) (USD $) In Thousands, unless otherwise specified |  |  |  | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2013 | Dec. 31, 2012 | Jun. 30, 2012 | Jun. 30, 2013 Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Commercial real estate, Construction [Member] Grade | Jun. 30, 2013 Risk grades 1-8 [Member] Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Risk grades 1-8 [Member] Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Risk grades 1-8 [Member] Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Risk grades 1-8 [Member] Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Risk grades 1-8 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Risk grades 1-8 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Risk grades 1-8 [Member] Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Risk grades 1-8 [Member] Commercial real estate, Construction [Member] Grade | Jun. 30, 2013 Risk grade 9 [Member] Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Risk grade 9 [Member] Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Risk grade 9 [Member] Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Risk grade 9 [Member] Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Risk grade 9 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Risk grade 9 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Risk grade 9 [Member] Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Risk grade 9 [Member] Commercial real estate, Construction [Member] Grade | Jun. 30, 2013 Risk grade 10 [Member] Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Risk grade 10 [Member] Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Risk grade 10 [Member] Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Risk grade 10 [Member] Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Risk grade 10 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Risk grade 10 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Risk grade 10 [Member] Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Risk grade 10 [Member] Commercial real estate, Construction [Member] Grade | Jun. 30, 2013 Risk grade 11 [Member] Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Risk grade 11 [Member] Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Risk grade 11 [Member] Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Risk grade 11 [Member] Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Risk grade 11 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Risk grade 11 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Risk grade 11 [Member] Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Risk grade 11 [Member] Commercial real estate, Construction [Member] Grade | Jun. 30, 2013 Risk grade 12 [Member] Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Risk grade 12 [Member] Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Risk grade 12 [Member] Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Risk grade 12 [Member] Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Risk grade 12 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Risk grade 12 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Risk grade 12 [Member] Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Risk grade 12 [Member] Commercial real estate, Construction [Member] Grade | Jun. 30, 2013 Risk grade 13 [Member] Commercial and industrial, Energy [Member] Grade | Dec. 31, 2012 Risk grade 13 [Member] Commercial and industrial, Energy [Member] Grade | Jun. 30, 2013 Risk grade 13 [Member] Commercial and industrial, Other commercial [Member] Grade | Dec. 31, 2012 Risk grade 13 [Member] Commercial and industrial, Other commercial [Member] Grade | Jun. 30, 2013 Risk grade 13 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Dec. 31, 2012 Risk grade 13 [Member] Commercial real estate, Buildings, land and other [Member] Grade | Jun. 30, 2013 Risk grade 13 [Member] Commercial real estate, Construction [Member] Grade | Dec. 31, 2012 Risk grade 13 [Member] Commercial real estate, Construction [Member] Grade
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted Average Risk Grade |  |  |  | 5.31 | 5.25 | 6.21 | 6.21 | 6.86 | 6.97 | 6.95 | 6.94 | 5.28 | 5.24 | 5.91 | 5.81 | 6.56 | 6.63 | 6.85 | 6.82 | 9.00 | 9.00 | 9.00 | 9.00 | 9.00 | 9.00 | 9.00 | 9.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | 11.00 | 11.00 | 11.00 | 11.00 | 11.00 | 11.00 | 11.00 | 11.00 | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | 13.00 | 13.00 | 13.00 | 13.00 | 13.00 | 13.00 | 13.00 | 13.00
Loans | $ 4,772,617 | $ 4,828,612 | $ 4,309,889 | $ 1,017,337 | $ 1,083,186 | $ 3,755,280 | $ 3,745,426 |  |  |  |  | $ 1,009,557 | $ 1,081,725 | $ 3,481,071 | $ 3,367,443 |  |  |  |  | $ 7,395 | $ 392 | $ 148,192 | $ 250,508 |  |  |  |  |  |  | $ 28,187 | $ 28,440 |  |  |  |  | $ 385 |  | $ 56,811 | $ 53,797 |  |  |  |  |  | $ 169 | $ 36,070 | $ 40,603 |  |  |  |  |  | $ 900 | $ 4,949 | $ 4,635 |  |  |  |
Loans | 3,371,268 | 3,319,795 | 3,119,902 |  |  |  |  | 2,782,525 | 2,711,489 |  |  |  |  |  |  | 2,564,596 | 2,460,448 |  |  |  |  |  |  | 74,938 | 92,041 |  |  |  |  |  |  | 38,397 | 42,603 |  |  |  |  |  |  | 62,929 | 77,658 |  |  |  |  |  |  | 38,321 | 35,602 |  |  |  |  |  |  | 3,344 | 3,137 |  |
Loans | $ 588,743 | $ 608,306 |  |  |  |  |  |  |  | $ 588,743 | $ 608,306 |  |  |  |  |  |  | $ 563,561 | $ 579,108 |  |  |  |  |  |  | $ 20,977 | $ 23,046 |  |  |  |  |  |  | $ 2,490 | $ 4,435 |  |  |  |  |  |  | $ 700 | $ 617 |  |  |  |  |  |  | $ 1,015 | $ 1,100 |  |  |  |  |  |  |  |

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- Definition Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(1)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a(1) -Article 9 + Details
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- Definition Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5066-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(a)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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