Deposits Deposits (Tables)

12 Months Ended

Dec. 31, 2019

Banking and Thrift [Abstract]

Summary of Average Balances and Weighted Average Rates Paid on Deposits

The following table presents average balances and weighted average rates paid on deposits for the years ended December 31, 2019, 2018 and 2017 (dollars in thousands):

	2019				2018				2017
	Average Balance		Average Rate Paid		Average Balance		Average Rate Paid		Average Balance		Average Rate Paid
Demand deposits:
Non-interest bearing	$	3,950,612	—	%	$	3,389,191	—	%	$	3,069,565	—	%
Interest bearing	1,824,803		1.37	%	1,627,828		1.13	%	1,586,390		0.81	%
Money market	10,716,274		1.84	%	10,350,772		1.41	%	9,364,498		0.85	%
Savings	206,545		0.24	%	284,198		0.26	%	365,603		0.21	%
Time	6,928,499		2.34	%	6,617,006		1.81	%	6,094,336		1.27	%
	$	23,626,733	1.63	%	$	22,268,995	1.28	%	$	20,480,392	0.83	%

Deposit Liabilities Disclosures [Text Block]

Note 6    Deposits

The following table presents average balances and weighted average rates paid on deposits for the years ended December 31, 2019, 2018 and 2017 (dollars in thousands):

	2019				2018				2017
	Average Balance		Average Rate Paid		Average Balance		Average Rate Paid		Average Balance		Average Rate Paid
Demand deposits:
Non-interest bearing	$	3,950,612	—	%	$	3,389,191	—	%	$	3,069,565	—	%
Interest bearing	1,824,803		1.37	%	1,627,828		1.13	%	1,586,390		0.81	%
Money market	10,716,274		1.84	%	10,350,772		1.41	%	9,364,498		0.85	%
Savings	206,545		0.24	%	284,198		0.26	%	365,603		0.21	%
Time	6,928,499		2.34	%	6,617,006		1.81	%	6,094,336		1.27	%
	$	23,626,733	1.63	%	$	22,268,995	1.28	%	$	20,480,392	0.83	%

Time deposit accounts with balances of $100,000 or more totaled approximately $3.5 billion and $4.1 billion at December 31, 2019 and 2018, respectively. Time deposit accounts with balances of $250,000 or more totaled $1.9 billion and $2.4 billion at December 31, 2019 and 2018, respectively.

The following table presents maturities of time deposits as of December 31, 2019 (in thousands):

Maturing in:
2020	$	7,196,988
2021	106,416
2022	24,289
2023	17,898
2024	1,656
	$	7,347,247

Included in deposits at December 31, 2019 are public funds deposits of $2.6 billion and brokered deposits of $3.7 billion. Investment securities available for sale with a carrying value of $1.0 billion were pledged as security for public funds deposits at December 31, 2019.

Interest expense on deposits for the years ended December 31, 2019, 2018 and 2017 was as follows (in thousands):

	2019		2018		2017
Interest bearing demand	$	25,054	$	18,391	$	12,873
Money market	197,445		145,585		79,645
Savings	497		739		752
Time	162,184		119,848		77,663
	$	385,180	$	284,563	$	170,933