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Deposits (Schedule of Deposits) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | $ 15,117,051 | $ 10,873,629
Time Deposits, $100,000 or More | 809,395 |
Total Interest-bearing deposits | 19,898,710 | 16,765,935
Total deposits | 35,015,761 | 27,639,564
Commercial And Individual [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 13,914,754 | 10,212,265
Correspondent Banks [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 242,225 | 246,181
Public Funds [Member] |  |
Deposit [Line Items] |  |
Non-interest-bearing demand deposits: | 960,072 | 415,183
Savings and interest checking | 597,503 | 548,399
Money market accounts | 50,070 | 73,180
Time Deposits, $100,000 or More | 5,163 | 24,672
Time accounts under $100,000 | 25 | 25
Total Interest-bearing deposits | 652,761 | 646,276
Private Accounts [Member] |  |
Deposit [Line Items] |  |
Savings and interest checking | 9,132,789 | 7,147,327
Money market accounts | 8,977,585 | 7,888,433
Time Deposits, $100,000 or More | 804,232 | 736,481
Time accounts under $100,000 | 331,343 | 347,418
Total Interest-bearing deposits | $ 19,245,949 | $ 16,119,659

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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://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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- Definition The aggregate of all domestic and foreign interest-bearing deposit liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 + Details
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