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Deposits (Tables)
12 Months Ended
Dec. 31, 2020
Deposits [Abstract]  
Deposit Liabilities, Type
Year-end deposits were as follows:
20202019
Non-interest-bearing demand deposits:
Commercial and individual$13,914,754 $10,212,265 
Correspondent banks242,225 246,181 
Public funds960,072 415,183 
Total non-interest-bearing demand deposits15,117,051 10,873,629 
Interest-bearing deposits:
Private accounts:
Savings and interest checking9,132,789 7,147,327 
Money market accounts8,977,585 7,888,433 
Time accounts of $100,000 or more804,232 736,481 
Time accounts under $100,000331,343 347,418 
Total private accounts19,245,949 16,119,659 
Public funds:
Savings and interest checking597,503 548,399 
Money market accounts50,070 73,180 
Time accounts of $100,000 or more5,163 24,672 
Time accounts under $100,00025 25 
Total public funds652,761 646,276 
Total interest-bearing deposits19,898,710 16,765,935 
Total deposits$35,015,761 $27,639,564 
Additional Information About Corporation's Deposits
The following table presents additional information about our year-end deposits:
20202019
Deposits from the Certificate of Deposit Account Registry Service (CDARS)$372 $361 
Deposits from foreign sources (primarily Mexico)884,169 805,828 
Deposits not covered by deposit insurance18,694,320 13,115,796 
Deposits from certain directors, executive officers and their affiliates210,389 197,919 
Scheduled Maturities of Time Deposits
Scheduled maturities of time deposits, including both private and public funds, at December 31, 2020 were as follows:
2021$979,825 
2022160,938 
$1,140,763 
Time Deposit Maturities
Scheduled maturities of time deposits in amounts of $100,000 or more, including both private and public funds, at December 31, 2020, were as follows:
Due within 3 months or less$327,284 
Due after 3 months and within 6 months178,403 
Due after 6 months and within 12 months195,766 
Due after 12 months107,942 
$809,395