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Deposits - Schedule of Deposits (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 9,649,933 | $ 10,270,233
Total interest-bearing deposits | 14,507,042 | 14,073,362
Total deposits | $ 24,156,975 | $ 24,343,595
Total non-interest-bearing demand deposits, Percentage of Total | 39.90% | 42.20%
Total interest-bearing deposits, Percentage of Total | 60.10% | 57.80%
Total deposits, Percentage of Total | 100.00% | 100.00%
Commercial and Individual [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 8,796,847 | $ 9,251,463
Total non-interest-bearing demand deposits, Percentage of Total | 36.40% | 38.00%
Correspondent Banks [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 310,417 | $ 378,930
Total non-interest-bearing demand deposits, Percentage of Total | 1.30% | 1.60%
Private Accounts [Member] |  |
Deposit [Line Items] |  |
Savings and interest checking | $ 5,732,748 | $ 5,149,905
Money market accounts | 7,514,572 | 7,536,998
Time accounts of $100,000 or more | 415,207 | 420,697
Time accounts under $100,000 | 397,091 | 405,726
Total private accounts | $ 14,059,618 | $ 13,513,326
Savings and interest checking, Percentage of Total | 23.70% | 21.10%
Money market accounts, Percentage of Total | 31.10% | 31.00%
Time accounts of $100,000 or more, Percentage of Total | 1.70% | 1.70%
Time accounts under $100,000, Percentage of Total | 1.70% | 1.70%
Total private accounts, Percentage of Total | 58.20% | 55.50%
Public Funds [Member] |  |
Deposit [Line Items] |  |
Total non-interest-bearing demand deposits | $ 542,669 | $ 639,840
Savings and interest checking | 304,500 | 420,324
Money market accounts | 113,713 | 93,969
Time accounts of $100,000 or more | 28,203 | 44,941
Time accounts under $100,000 | 1,008 | 802
Total public funds | $ 447,424 | $ 560,036
Total non-interest-bearing demand deposits, Percentage of Total | 2.20% | 2.60%
Savings and interest checking, Percentage of Total | 1.30% | 1.70%
Money market accounts, Percentage of Total | 0.50% | 0.40%
Time accounts of $100,000 or more, Percentage of Total | 0.10% | 0.20%
Time accounts under $100,000, Percentage of Total | 0.00% | 0.00%
Total public funds, Percentage of Total | 1.90% | 2.30%

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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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