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Deposits - Schedule of Deposits (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 10,468,605 | $ 10,149,061
Total interest-bearing deposits | 13,855,792 | 13,986,869
Total deposits | $ 24,324,397 | $ 24,135,930
Total non-interest-bearing demand deposits, Percentage of Total | 43.00% | 42.00%
Total interest-bearing deposits, Percentage of Total | 57.00% | 58.00%
Total deposits, Percentage of Total | 100.00% | 100.00%
Commercial and Individual [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 9,496,386 | $ 9,256,045
Total non-interest-bearing demand deposits, Percentage of Total | 39.00% | 38.30%
Correspondent Banks [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 336,918 | $ 429,000
Total non-interest-bearing demand deposits, Percentage of Total | 1.40% | 1.80%
Private Accounts [Member] |  |
Deposit [Line Items] |  |
Savings and interest checking | $ 4,898,952 | $ 4,743,963
Money market accounts | 7,647,442 | 7,860,403
Time accounts of $100,000 or more | 428,425 | 490,209
Time accounts under $100,000 | 413,938 | 454,220
Total private accounts | $ 13,388,757 | $ 13,548,795
Savings and interest checking, Percentage of Total | 20.10% | 19.70%
Money market accounts, Percentage of Total | 31.40% | 32.60%
Time accounts of $100,000 or more, Percentage of Total | 1.80% | 2.00%
Time accounts under $100,000, Percentage of Total | 1.70% | 1.90%
Total private accounts, Percentage of Total | 55.00% | 56.20%
Public Funds [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 635,301 | $ 464,016
Savings and interest checking | 311,474 | 326,090
Money market accounts | 103,961 | 57,145
Time accounts of $100,000 or more | 50,819 | 53,684
Time accounts under $100,000 | 781 | 1,155
Total public funds | $ 467,035 | $ 438,074
Total non-interest-bearing demand deposits, Percentage of Total | 2.60% | 1.90%
Savings and interest checking, Percentage of Total | 1.30% | 1.40%
Money market accounts, Percentage of Total | 0.50% | 0.20%
Time accounts of $100,000 or more, Percentage of Total | 0.20% | 0.20%
Time accounts under $100,000, Percentage of Total | 0.00% | 0.00%
Total public funds, Percentage of Total | 2.00% | 1.80%

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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 + 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 + 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 + Details
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