XML 43 R34.htm IDEA: XBRL DOCUMENT
v3.23.3

Deposits (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2023
Deposits [Abstract] |
Schedule of Deposits | The following table is a summary of deposits as of the dates shown:
(Dollars in thousands) | September 30, 2023 |  | December 31, 2022 |  | September 30, 2022
Balance: |  |  |  |  |
Non-interest-bearing | $ | 10,347,006 |  |  | $ | 12,668,160 |  |  | $ | 13,529,277 |
NOW and interest-bearing demand deposits | 6,006,114 |  |  | 5,591,986 |  |  | 5,676,122 |
Wealth management deposits | 1,788,099 |  |  | 2,463,833 |  |  | 2,988,195 |
Money market | 14,478,504 |  |  | 12,886,795 |  |  | 12,538,489 |
Savings | 5,584,294 |  |  | 4,556,635 |  |  | 3,988,790 |
Time certificates of deposit | 6,788,669 |  |  | 4,735,135 |  |  | 4,076,318 |
Total deposits | $ | 44,992,686 |  |  | $ | 42,902,544 |  |  | $ | 42,797,191 |
Mix: |  |  |  |  |
Non-interest-bearing | 23 | % |  | 30 | % |  | 32 | %
NOW and interest-bearing demand deposits | 13 |  |  | 13 |  |  | 13 |
Wealth management deposits | 4 |  |  | 5 |  |  | 7 |
Money market | 32 |  |  | 30 |  |  | 29 |
Savings | 13 |  |  | 11 |  |  | 9 |
Time certificates of deposit | 15 |  |  | 11 |  |  | 10 |
Total deposits | 100 | % |  | 100 | % |  | 100 | %

X
- References No definition available. + Details
Name: | us-gaap_DepositsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Summary of Deposits [Table Text Block] + References No definition available. + Details
Name: | wtfc_SummaryOfDepositsTableTextBlock
Namespace Prefix: | wtfc_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration