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Deposits
 9 Months Ended
Sep. 30, 2018
Deposits [Abstract]  
Deposits
Deposits

The following table is a summary of deposits as of the dates shown: 
(Dollars in thousands)
September 30,
2018
 
December 31,
2017
 
September 30,
2017
Balance:
 
 
 
 
 
Non-interest bearing
$
6,399,213

 
$
6,792,497

 
$
6,502,409

NOW and interest bearing demand deposits
2,512,259

 
2,315,055

 
2,273,025

Wealth management deposits
2,520,120

 
2,323,699

 
2,171,758

Money market
5,429,921

 
4,515,353

 
4,607,995

Savings
2,595,164

 
2,829,373

 
2,673,201

Time certificates of deposit
5,460,038

 
4,407,370

 
4,666,675

Total deposits
$
24,916,715

 
$
23,183,347

 
$
22,895,063

Mix:
 
 
 
 
 
Non-interest bearing
26
%
 
29
%
 
28
%
NOW and interest bearing demand deposits
10

 
10

 
10

Wealth management deposits
10

 
10

 
10

Money market
22

 
20

 
20

Savings
10

 
12

 
12

Time certificates of deposit
22

 
19

 
20

Total deposits
100
%
 
100
%
 
100
%


Wealth management deposits represent deposit balances (primarily money market accounts) at the Company’s subsidiary banks from brokerage customer of Wintrust Investments, LLC ("Wintrust Investments"), trust and asset management customers of the Company and brokerage customers from unaffiliated companies.