XML 62 R53.htm IDEA: XBRL DOCUMENT
v3.23.3

Allowance for Credit Losses - Schedule of Loan Portfolio by Credit Quality Indicator (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | $ 10,722,343 |  | $ 10,722,343 |  |
2022 | 6,539,701 |  | 6,539,701 |  |
2021 | 5,384,844 |  | 5,384,844 |  |
2020 | 3,298,044 |  | 3,298,044 |  |
2019 | 2,528,296 |  | 2,528,296 |  |
Prior | 8,341,065 |  | 8,341,065 |  |
Revolving | 4,619,809 |  | 4,619,809 |  |
Revolving to term | 11,930 |  | 11,930 |  |
Total Loans | 41,446,032 | $ 38,167,613 | 41,446,032 | $ 38,167,613 | $ 39,196,485
Three months ended September 30, 2023 |  |  |  |  |
2023 | 6,285 |  | 11,726 |  |
2022 | 2,889 |  | 8,351 |  |
2021 | 525 |  | 2,774 |  |
2020 | 35 |  | 5,531 |  |
2019 | 350 |  | 5,682 |  |
Prior | 393 |  | 2,280 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total loans | 10,477 | 7,524 | 36,344 | 24,565 |
Commercial, industrial and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 2,190,915 |  | 2,190,915 |  |
2022 | 2,273,907 |  | 2,273,907 |  |
2021 | 1,813,036 |  | 1,813,036 |  |
2020 | 796,529 |  | 796,529 |  |
2019 | 524,107 |  | 524,107 |  |
Prior | 1,056,029 |  | 1,056,029 |  |
Revolving | 4,062,959 |  | 4,062,959 |  |
Revolving to term | 7,991 |  | 7,991 |  |
Total Loans | 12,725,473 |  | 12,725,473 |  |
Construction and development |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 231,587 |  | 231,587 |  |
2022 | 763,430 |  | 763,430 |  |
2021 | 438,554 |  | 438,554 |  |
2020 | 183,955 |  | 183,955 |  |
2019 | 134,733 |  | 134,733 |  |
Prior | 122,308 |  | 122,308 |  |
Revolving | 18,842 |  | 18,842 |  |
Revolving to term | 364 |  | 364 |  |
Total Loans | 1,893,773 |  | 1,893,773 |  |
Non-construction |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 1,115,648 |  | 1,115,648 |  |
2022 | 1,869,325 |  | 1,869,325 |  |
2021 | 1,435,250 |  | 1,435,250 |  |
2020 | 1,034,216 |  | 1,034,216 |  |
2019 | 810,044 |  | 810,044 |  |
Prior | 2,615,381 |  | 2,615,381 |  |
Revolving | 169,654 |  | 169,654 |  |
Revolving to term | 2,889 |  | 2,889 |  |
Total Loans | 9,052,407 |  | 9,052,407 |  |
Home equity |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 228 |  | 228 |  |
2021 | 141 |  | 141 |  |
2020 | 157 |  | 157 |  |
2019 | 177 |  | 177 |  |
Prior | 14,916 |  | 14,916 |  |
Revolving | 326,953 |  | 326,953 |  |
Revolving to term | 686 |  | 686 |  |
Total Loans | 343,258 | 328,822 | 343,258 | 328,822 | 332,698
Three months ended September 30, 2023 |  |  |  |  |
Total loans | 227 | 43 | 227 | 432 |
Residential real estate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 361,605 |  | 361,605 |  |
2022 | 845,709 |  | 845,709 |  |
2021 | 808,227 |  | 808,227 |  |
2020 | 231,196 |  | 231,196 |  |
2019 | 133,792 |  | 133,792 |  |
Prior | 327,074 |  | 327,074 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 2,707,603 | 2,235,459 | 2,707,603 | 2,235,459 | 2,372,383
Three months ended September 30, 2023 |  |  |  |  |
Total loans | 78 | 5 | 78 | 471 |
Premium finance receivables - property and casualty |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 6,551,482 |  | 6,551,482 |  |
2022 | 147,858 |  | 147,858 |  |
2021 | 20,098 |  | 20,098 |  |
2020 | 3,174 |  | 3,174 |  |
2019 | 135 |  | 135 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 6,722,747 |  | 6,722,747 |  |
Premium finance receivables - life |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 268,027 |  | 268,027 |  |
2022 | 637,571 |  | 637,571 |  |
2021 | 868,576 |  | 868,576 |  |
2020 | 1,048,697 |  | 1,048,697 |  |
2019 | 924,944 |  | 924,944 |  |
Prior | 4,183,993 |  | 4,183,993 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 7,931,808 |  | 7,931,808 |  |
Consumer and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 3,079 |  | 3,079 |  |
2022 | 1,673 |  | 1,673 |  |
2021 | 962 |  | 962 |  |
2020 | 120 |  | 120 |  |
2019 | 364 |  | 364 |  |
Prior | 21,364 |  | 21,364 |  |
Revolving | 41,401 |  | 41,401 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 68,963 | 47,702 | 68,963 | 47,702 | $ 50,836
Three months ended September 30, 2023 |  |  |  |  |
Total loans | 184 | $ 635 | 447 | $ 1,081 |
Pass |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 10,551,479 |  | 10,551,479 |  |
2022 | 6,407,567 |  | 6,407,567 |  |
2021 | 5,241,014 |  | 5,241,014 |  |
2020 | 3,216,387 |  | 3,216,387 |  |
2019 | 2,377,985 |  | 2,377,985 |  |
Prior | 7,977,092 |  | 7,977,092 |  |
Revolving | 4,402,588 |  | 4,402,588 |  |
Revolving to term | 7,916 |  | 7,916 |  |
Total Loans | 40,182,028 |  | 40,182,028 |  |
Pass | Commercial, industrial and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 2,148,269 |  | 2,148,269 |  |
2022 | 2,182,012 |  | 2,182,012 |  |
2021 | 1,717,737 |  | 1,717,737 |  |
2020 | 772,160 |  | 772,160 |  |
2019 | 492,465 |  | 492,465 |  |
Prior | 1,011,144 |  | 1,011,144 |  |
Revolving | 3,854,978 |  | 3,854,978 |  |
Revolving to term | 5,633 |  | 5,633 |  |
Total Loans | 12,184,398 |  | 12,184,398 |  |
Pass | Construction and development |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 231,587 |  | 231,587 |  |
2022 | 760,955 |  | 760,955 |  |
2021 | 434,667 |  | 434,667 |  |
2020 | 174,574 |  | 174,574 |  |
2019 | 85,436 |  | 85,436 |  |
Prior | 94,739 |  | 94,739 |  |
Revolving | 18,842 |  | 18,842 |  |
Revolving to term | 364 |  | 364 |  |
Total Loans | 1,801,164 |  | 1,801,164 |  |
Pass | Non-construction |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 1,108,119 |  | 1,108,119 |  |
2022 | 1,856,346 |  | 1,856,346 |  |
2021 | 1,402,456 |  | 1,402,456 |  |
2020 | 999,191 |  | 999,191 |  |
2019 | 762,188 |  | 762,188 |  |
Prior | 2,482,011 |  | 2,482,011 |  |
Revolving | 164,654 |  | 164,654 |  |
Revolving to term | 1,452 |  | 1,452 |  |
Total Loans | 8,776,417 |  | 8,776,417 |  |
Pass | Home equity |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2020 | 45 |  | 45 |  |
2019 | 93 |  | 93 |  |
Prior | 6,438 |  | 6,438 |  |
Revolving | 322,726 |  | 322,726 |  |
Revolving to term | 467 |  | 467 |  |
Total Loans | 329,769 |  | 329,769 |  |
Pass | Residential real estate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 359,397 |  | 359,397 |  |
2022 | 835,153 |  | 835,153 |  |
2021 | 796,743 |  | 796,743 |  |
2020 | 218,433 |  | 218,433 |  |
2019 | 112,360 |  | 112,360 |  |
Prior | 177,538 |  | 177,538 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 2,499,624 |  | 2,499,624 |  |
Pass | Premium finance receivables - property and casualty |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 6,433,013 |  | 6,433,013 |  |
2022 | 133,881 |  | 133,881 |  |
2021 | 19,877 |  | 19,877 |  |
2020 | 3,167 |  | 3,167 |  |
2019 | 135 |  | 135 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 6,590,073 |  | 6,590,073 |  |
Pass | Premium finance receivables - life |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 268,027 |  | 268,027 |  |
2022 | 637,571 |  | 637,571 |  |
2021 | 868,576 |  | 868,576 |  |
2020 | 1,048,697 |  | 1,048,697 |  |
2019 | 924,944 |  | 924,944 |  |
Prior | 4,183,993 |  | 4,183,993 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 7,931,808 |  | 7,931,808 |  |
Pass | Consumer and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 3,067 |  | 3,067 |  |
2022 | 1,649 |  | 1,649 |  |
2021 | 958 |  | 958 |  |
2020 | 120 |  | 120 |  |
2019 | 364 |  | 364 |  |
Prior | 21,229 |  | 21,229 |  |
Revolving | 41,388 |  | 41,388 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 68,775 |  | 68,775 |  |
Special mention |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 124,533 |  | 124,533 |  |
2022 | 65,053 |  | 65,053 |  |
2021 | 102,912 |  | 102,912 |  |
2020 | 33,473 |  | 33,473 |  |
2019 | 60,355 |  | 60,355 |  |
Prior | 74,795 |  | 74,795 |  |
Revolving | 120,476 |  | 120,476 |  |
Revolving to term | 2,692 |  | 2,692 |  |
Total Loans | 584,289 |  | 584,289 |  |
Special mention | Commercial, industrial and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 18,043 |  | 18,043 |  |
2022 | 47,296 |  | 47,296 |  |
2021 | 69,910 |  | 69,910 |  |
2020 | 18,805 |  | 18,805 |  |
2019 | 16,248 |  | 16,248 |  |
Prior | 5,140 |  | 5,140 |  |
Revolving | 112,580 |  | 112,580 |  |
Revolving to term | 1,255 |  | 1,255 |  |
Total Loans | 289,277 |  | 289,277 |  |
Special mention | Construction and development |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 3,887 |  | 3,887 |  |
2020 | 0 |  | 0 |  |
2019 | 19,937 |  | 19,937 |  |
Prior | 14,302 |  | 14,302 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 38,126 |  | 38,126 |  |
Special mention | Non-construction |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 6,621 |  | 6,621 |  |
2022 | 11,567 |  | 11,567 |  |
2021 | 27,250 |  | 27,250 |  |
2020 | 13,324 |  | 13,324 |  |
2019 | 23,755 |  | 23,755 |  |
Prior | 48,640 |  | 48,640 |  |
Revolving | 5,000 |  | 5,000 |  |
Revolving to term | 1,437 |  | 1,437 |  |
Total Loans | 137,594 |  | 137,594 |  |
Special mention | Home equity |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 228 |  | 228 |  |
2021 | 64 |  | 64 |  |
2020 | 0 |  | 0 |  |
2019 | 67 |  | 67 |  |
Prior | 1,622 |  | 1,622 |  |
Revolving | 2,893 |  | 2,893 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 4,874 |  | 4,874 |  |
Special mention | Residential real estate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 1,186 |  | 1,186 |  |
2022 | 3,373 |  | 3,373 |  |
2021 | 1,673 |  | 1,673 |  |
2020 | 1,343 |  | 1,343 |  |
2019 | 348 |  | 348 |  |
Prior | 4,991 |  | 4,991 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 12,914 |  | 12,914 |  |
Special mention | Premium finance receivables - property and casualty |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 98,681 |  | 98,681 |  |
2022 | 2,574 |  | 2,574 |  |
2021 | 128 |  | 128 |  |
2020 | 1 |  | 1 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 101,384 |  | 101,384 |  |
Special mention | Premium finance receivables - life |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 0 |  | 0 |  |
Special mention | Consumer and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 2 |  | 2 |  |
2022 | 15 |  | 15 |  |
2021 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 100 |  | 100 |  |
Revolving | 3 |  | 3 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 120 |  | 120 |  |
Substandard accrual |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 7,031 |  | 7,031 |  |
2022 | 48,856 |  | 48,856 |  |
2021 | 25,648 |  | 25,648 |  |
2020 | 24,516 |  | 24,516 |  |
2019 | 63,130 |  | 63,130 |  |
Prior | 138,900 |  | 138,900 |  |
Revolving | 96,580 |  | 96,580 |  |
Revolving to term | 1,231 |  | 1,231 |  |
Total Loans | 405,892 |  | 405,892 |  |
Substandard accrual | Commercial, industrial and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 3,683 |  | 3,683 |  |
2022 | 40,284 |  | 40,284 |  |
2021 | 19,105 |  | 19,105 |  |
2020 | 1,409 |  | 1,409 |  |
2019 | 9,179 |  | 9,179 |  |
Prior | 38,135 |  | 38,135 |  |
Revolving | 95,331 |  | 95,331 |  |
Revolving to term | 1,103 |  | 1,103 |  |
Total Loans | 208,229 |  | 208,229 |  |
Substandard accrual | Construction and development |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 2,475 |  | 2,475 |  |
2021 | 0 |  | 0 |  |
2020 | 1,132 |  | 1,132 |  |
2019 | 29,360 |  | 29,360 |  |
Prior | 13,132 |  | 13,132 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 46,099 |  | 46,099 |  |
Substandard accrual | Non-construction |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 1,412 |  | 1,412 |  |
2021 | 5,519 |  | 5,519 |  |
2020 | 20,916 |  | 20,916 |  |
2019 | 24,101 |  | 24,101 |  |
Prior | 77,789 |  | 77,789 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 129,737 |  | 129,737 |  |
Substandard accrual | Home equity |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 5,885 |  | 5,885 |  |
Revolving | 1,239 |  | 1,239 |  |
Revolving to term | 128 |  | 128 |  |
Total Loans | 7,252 |  | 7,252 |  |
Substandard accrual | Residential real estate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 919 |  | 919 |  |
2022 | 2,575 |  | 2,575 |  |
2021 | 1,022 |  | 1,022 |  |
2020 | 1,059 |  | 1,059 |  |
2019 | 490 |  | 490 |  |
Prior | 3,924 |  | 3,924 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 9,989 |  | 9,989 |  |
Substandard accrual | Premium finance receivables - property and casualty |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 2,429 |  | 2,429 |  |
2022 | 2,103 |  | 2,103 |  |
2021 | 2 |  | 2 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 4,534 |  | 4,534 |  |
Substandard accrual | Premium finance receivables - life |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 0 |  | 0 |  |
Substandard accrual | Consumer and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 7 |  | 7 |  |
2021 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 35 |  | 35 |  |
Revolving | 10 |  | 10 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 52 |  | 52 |  |
Substandard nonaccrual/doubtful |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 39,300 |  | 39,300 |  |
2022 | 15,701 |  | 15,701 |  |
2021 | 9,769 |  | 9,769 |  |
2020 | 14,118 |  | 14,118 |  |
2019 | 8,703 |  | 8,703 |  |
Prior | 17,003 |  | 17,003 |  |
Revolving | 165 |  | 165 |  |
Revolving to term | 91 |  | 91 |  |
Total Loans | 104,850 |  | 104,850 |  |
Substandard nonaccrual/doubtful | Commercial, industrial and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 20,920 |  | 20,920 |  |
2022 | 4,315 |  | 4,315 |  |
2021 | 6,284 |  | 6,284 |  |
2020 | 4,155 |  | 4,155 |  |
2019 | 6,215 |  | 6,215 |  |
Prior | 1,610 |  | 1,610 |  |
Revolving | 70 |  | 70 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 43,569 |  | 43,569 |  |
Substandard nonaccrual/doubtful | Construction and development |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2020 | 8,249 |  | 8,249 |  |
2019 | 0 |  | 0 |  |
Prior | 135 |  | 135 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 8,384 |  | 8,384 |  |
Substandard nonaccrual/doubtful | Non-construction |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 908 |  | 908 |  |
2022 | 0 |  | 0 |  |
2021 | 25 |  | 25 |  |
2020 | 785 |  | 785 |  |
2019 | 0 |  | 0 |  |
Prior | 6,941 |  | 6,941 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 8,659 |  | 8,659 |  |
Substandard nonaccrual/doubtful | Home equity |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 77 |  | 77 |  |
2020 | 112 |  | 112 |  |
2019 | 17 |  | 17 |  |
Prior | 971 |  | 971 |  |
Revolving | 95 |  | 95 |  |
Revolving to term | 91 |  | 91 |  |
Total Loans | 1,363 |  | 1,363 |  |
Substandard nonaccrual/doubtful | Residential real estate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 103 |  | 103 |  |
2022 | 2,084 |  | 2,084 |  |
2021 | 3,288 |  | 3,288 |  |
2020 | 811 |  | 811 |  |
2019 | 2,471 |  | 2,471 |  |
Prior | 7,346 |  | 7,346 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 16,103 |  | 16,103 |  |
Substandard nonaccrual/doubtful | Premium finance receivables - property and casualty |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 17,359 |  | 17,359 |  |
2022 | 9,300 |  | 9,300 |  |
2021 | 91 |  | 91 |  |
2020 | 6 |  | 6 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 26,756 |  | 26,756 |  |
Substandard nonaccrual/doubtful | Premium finance receivables - life |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 0 |  | 0 |  |
2021 | 0 |  | 0 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 0 |  | 0 |  |
Substandard nonaccrual/doubtful | Consumer and other |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 10 |  | 10 |  |
2022 | 2 |  | 2 |  |
2021 | 4 |  | 4 |  |
2020 | 0 |  | 0 |  |
2019 | 0 |  | 0 |  |
Prior | 0 |  | 0 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 16 |  | 16 |  |
Early buy-out loans guaranteed by U.S. government agencies |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 2,524 |  | 2,524 |  |
2021 | 5,501 |  | 5,501 |  |
2020 | 9,550 |  | 9,550 |  |
2019 | 18,123 |  | 18,123 |  |
Prior | 133,275 |  | 133,275 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | 168,973 |  | 168,973 |  |
Early buy-out loans guaranteed by U.S. government agencies | Residential real estate |  |  |  |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |  |  |  |
2023 | 0 |  | 0 |  |
2022 | 2,524 |  | 2,524 |  |
2021 | 5,501 |  | 5,501 |  |
2020 | 9,550 |  | 9,550 |  |
2019 | 18,123 |  | 18,123 |  |
Prior | 133,275 |  | 133,275 |  |
Revolving | 0 |  | 0 |  |
Revolving to term | 0 |  | 0 |  |
Total Loans | $ 168,973 |  | $ 168,973 |  |

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6A Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoan
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of revolving financing receivable converted to term loan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6A + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingConvertedToTermLoanWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479294/326-20-55-79 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_CommercialIndustrialAndOtherPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_ConstructionAndDevelopmentPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_NonConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_HomeEquityPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_PremiumPropertyAndCasualtyInsurancePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_PremiumLifeInsurancePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wtfc_ConsumerAndOtherPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=wtfc_EarlyBuyOutLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |