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Deposits - Schedule of Deposits (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
--- | --- | ---
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 8,101,773 | $ 8,096,937
Total interest-bearing deposits | 11,877,121 | 11,400,429
Total deposits | 19,978,894 | 19,497,366
Total non-interest-bearing demand deposits, Percentage of Total | 40.60% | 41.50%
Total interest-bearing deposits, Percentage of Total | 59.40% | 58.50%
Total deposits, Percentage of Total | 100.00% | 100.00%
Commercial and Individual [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | 7,343,136 | 7,186,105
Total non-interest-bearing demand deposits, Percentage of Total | 36.80% | 36.90%
Correspondent Banks [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | 341,127 | 436,381
Total non-interest-bearing demand deposits, Percentage of Total | 1.70% | 2.20%
Private Accounts [Member] |  |
Deposit [Line Items] |  |
Savings and interest checking | 3,652,924 | 3,812,712
Money market accounts | 6,863,314 | 6,127,256
Time accounts of $100,000 or more | 509,985 | 514,346
Time accounts under $100,000 | 443,296 | 464,641
Total private accounts | 11,469,519 | 10,918,955
Savings and interest checking, Percentage of Total | 18.30% | 19.60%
Money market accounts, Percentage of Total | 34.30% | 31.40%
Time accounts of $100,000 or more, Percentage of Total | 2.60% | 2.60%
Time accounts under $100,000, Percentage of Total | 2.20% | 2.40%
Total private accounts, Percentage of Total | 57.40% | 56.00%
Public Funds [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | 417,510 | 474,451
Savings and interest checking | 222,236 | 287,391
Money market accounts | 34,467 | 50,600
Time accounts of $100,000 or more | 148,111 | 140,191
Time accounts under $100,000 | 2,788 | 3,292
Total public funds | $ 407,602 | $ 481,474
Total non-interest-bearing demand deposits, Percentage of Total | 2.10% | 2.40%
Savings and interest checking, Percentage of Total | 1.10% | 1.50%
Money market accounts, Percentage of Total | 0.20% | 0.30%
Time accounts under $100,000, Percentage of Total | 0.00% | 0.00%
Time accounts of $100,000 or more, Percentage of Total | 0.70% | 0.70%
Total public funds, Percentage of Total | 2.00% | 2.50%

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition Amount of deposits in accounts that offer many of the same services as checking accounts although transactions may be somewhat more limited, share some of the characteristics of a money market fund and are insured by the Federal government, also known as money market accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 12 -Article 9 + Details
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- Definition The aggregate amount of domestic time deposits (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $100,000 or more. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818 + Details
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