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Deposits (Schedule of Deposits) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | $ 10,513,369 | $ 10,270,233
Time Deposits, $100,000 or More | 475,776 |
Total Interest-bearing deposits | 15,298,206 | 14,073,362
Total deposits | 25,811,575 | 24,343,595
Commercial And Individual [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 9,670,989 | 9,251,463
Correspondent Banks [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 280,751 | 378,930
Private Accounts [Member] |  |
Deposit [Line Items] |  |
Savings and interest checking | 6,436,065 | 5,149,905
Money market accounts | 7,486,431 | 7,536,998
Time Deposits, $100,000 or More | 460,028 | 420,697
Time accounts under $100,000 | 338,714 | 405,726
Total private accounts | 14,721,238 | 13,513,326
Public Funds [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 561,629 | 639,840
Savings and interest checking | 446,872 | 420,324
Money market accounts | 113,669 | 93,969
Time Deposits, $100,000 or More | 15,748 | 44,941
Time accounts under $100,000 | 679 | 802
Total public funds | $ 576,968 | $ 560,036

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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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