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Deposits
 12 Months Ended
Dec. 31, 2020
Brokers and Dealers [Abstract]  
Deposit Liabilities Disclosures [Text Block] Deposits
The following table presents average balances and weighted average rates paid on deposits for the years ended December 31, 2020, 2019 and 2018 (dollars in thousands):
 202020192018
 Average
Balance		Average
Rate Paid		Average
Balance		Average
Rate Paid		Average
Balance		Average
Rate Paid
Demand deposits:      
Non-interest bearing$5,760,309 — %$3,950,612 — %$3,389,191 — %
Interest bearing2,582,951 0.75 %1,824,803 1.37 %1,627,828 1.13 %
Savings and money market10,843,894 0.79 %10,922,819 1.81 %10,634,970 1.38 %
Time6,617,939 1.43 %6,928,499 2.34 %6,617,006 1.81 %
$25,805,093 0.77 %$23,626,733 1.63 %$22,268,995 1.28 %
Time deposit accounts with balances of $250,000 or more totaled $1.1 billion and $1.9 billion at December 31, 2020 and 2019, respectively.
The following table presents maturities of time deposits as of December 31, 2020 (in thousands):
Maturing in:
2021$4,655,878 
2022110,183 
202324,368 
20241,302 
202515,468 
$4,807,199 
Included in deposits at December 31, 2020 are public funds deposits of $2.5 billion and brokered deposits of $4.0 billion. Investment securities available for sale with a carrying value of $952 million were pledged as security for public funds deposits at December 31, 2020.
Interest expense on deposits for the years ended December 31, 2020, 2019 and 2018 was as follows (in thousands):
 202020192018
Interest bearing demand$19,445 $25,054 $18,391 
Savings and money market85,572 197,942 146,324 
Time94,963 162,184 119,848 
$199,980 $385,180 $284,563