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Loans (Tables)
 12 Months Ended
Dec. 31, 2023
Receivables [Abstract]  
Amounts Outstanding for Loans and Leases by Segment and Class
Amounts outstanding for Loans, by segment and class, are shown in the following table.
TABLE 64: LOANS
DECEMBER 31,
(In Millions)20232022
Commercial
Commercial and Institutional(1)
$11,555.3 $12,415.0 
Commercial Real Estate5,134.2 4,773.0 
Non-U.S.(1)
2,778.5 3,131.1 
Other5,944.8 1,316.5 
Total Commercial25,412.8 21,635.6 
Personal
Private Client14,360.0 14,119.0 
Residential Real Estate6,327.1 6,413.5 
Non-U.S.428.8 510.0 
Other1,088.3 215.2 
Total Personal22,204.2 21,257.7 
Total Loans$47,617.0 $42,893.3 
(1) Commercial and institutional and commercial-non-U.S. combined include $4.5 billion and $5.6 billion of private equity capital call finance loans at December 31, 2023 and 2022, respectively.
Loan and Lease Segment and Class Balances Segregated by Borrower Ratings into "1 to 3", "4 to 5" and "6 to 9" (Watch List) Categories
TABLE 65: CREDIT QUALITY INDICATOR AT AMORTIZED COST BASIS BY ORIGINATION YEAR
DECEMBER 31, 2023TERM LOANSREVOLVING LOANSREVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)20232022202120202019PRIORTOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category$443.9 $534.1 $668.3 $78.1 $137.2 $409.9 $4,909.8 $15.0 $7,196.3 
4 to 5 Category801.4 790.9 729.5 138.7 120.5 178.7 1,332.4 72.0 4,164.1 
6 to 9 Category13.8 70.0 60.8 12.0 0.1 1.7 34.7 1.8 194.9 
Total Commercial and Institutional1,259.1 1,395.0 1,458.6 228.8 257.8 590.3 6,276.9 88.8 11,555.3 
Commercial Real Estate (CRE)
Risk Rating:
1 to 3 Category403.6 389.9 159.1 23.9 37.8 44.8 51.0 — 1,110.1 
4 to 5 Category1,513.5 1,208.8 521.0 218.4 252.8 96.0 136.3 7.9 3,954.7 
6 to 9 Category 16.1 — 30.5 — 8.2 14.6 — — 69.4 
Total CRE1,933.2 1,598.7 710.6 242.3 298.8 155.4 187.3 7.9 5,134.2 
CRE Gross Charge-offs(0.7)(4.4)— — — — — — (5.1)
Non-U.S.
Risk Rating:
1 to 3 Category487.9 — 43.2 65.2 34.2 3.3 760.0 — 1,393.8 
4 to 5 Category974.7 0.8 — — — 150.0 243.4 — 1,368.9 
6 to 9 Category1.5 14.3 — — — — — — 15.8 
Total Non-U.S.1,464.1 15.1 43.2 65.2 34.2 153.3 1,003.4 — 2,778.5 
Other
Risk Rating:
1 to 3 Category4,313.2 — — — — — — — 4,313.2 
4 to 5 Category1,631.6 — — — — — — — 1,631.6 
Total Other5,944.8 — — — — — — — 5,944.8 
Other Gross Charge-offs(0.6)— — — — — — — (0.6)
Total Commercial10,601.2 3,008.8 2,212.4 536.3 590.8 899.0 7,467.6 96.7 25,412.8 
Commercial Gross Charge-offs(1.3)(4.4)— — — — — — (5.7)
Personal
Private Client
Risk Rating:
1 to 3 Category504.7 140.8 52.3 67.5 8.7 134.7 5,320.9 168.1 6,397.7 
4 to 5 Category290.1 488.2 655.1 100.9 158.8 44.7 5,721.5 447.8 7,907.1 
6 to 9 Category 23.6 0.3 — — — 18.3 13.0 — 55.2 
Total Private Client818.4 629.3 707.4 168.4 167.5 197.7 11,055.4 615.9 14,360.0 
Residential Real Estate (RRE)
Risk Rating:
1 to 3 Category278.7 464.0 500.6 373.3 142.4 722.4 219.8 — 2,701.2 
4 to 5 Category191.6 694.9 717.4 686.7 290.0 805.3 170.3 — 3,556.2 
6 to 9 Category — 10.9 — 0.7 1.6 43.6 12.9 — 69.7 
Total RRE470.3 1,169.8 1,218.0 1,060.7 434.0 1,571.3 403.0 — 6,327.1 
RRE Gross Charge-offs(0.8)— — — — (1.0)— — (1.8)
Non-U.S.
Risk Rating:
1 to 3 Category15.5 — 0.6 — — 4.6 71.4 — 92.1 
4 to 5 Category12.7 16.0 39.2 — 16.4 8.9 236.1 7.4 336.7 
Total Non-U.S.28.2 16.0 39.8 — 16.4 13.5 307.5 7.4 428.8 
Other
Risk Rating:
1 to 3 Category461.7 — — — — — — — 461.7 
4 to 5 Category626.6 — — — — — — — 626.6 
Total Other1,088.3 — — — — — — — 1,088.3 
Total Personal2,405.2 1,815.1 1,965.2 1,229.1 617.9 1,782.5 11,765.9 623.3 22,204.2 
Personal Gross Charge-offs(0.8)— — — — (1.0)— — (1.8)
Total Loans$13,006.4 $4,823.9 $4,177.6 $1,765.4 $1,208.7 $2,681.5 $19,233.5 $720.0 $47,617.0 
Total Loans Gross Charge-offs$(2.1)$(4.4)$— $— $— $(1.0)$— $— $(7.5)
December 31, 2022TERM LOANSREVOLVING LOANSREVOLVING LOANS CONVERTED TO TERM LOANS
(In Millions)20222021202020192018PRIORTOTAL
Commercial
Commercial and Institutional
Risk Rating:
1 to 3 Category$753.3 $1,087.5 $209.8 $159.3 $45.9 $511.3 $6,032.8 $17.7 $8,817.6 
4 to 5 Category744.1 740.6 300.8 191.1 151.4 174.7 1,102.3 32.9 3,437.9 
6 to 9 Category50.8 30.5 — 13.7 — — 64.5 — 159.5 
Total Commercial and Institutional1,548.2 1,858.6 510.6 364.1 197.3 686.0 7,199.6 50.6 12,415.0 
CRE
Risk Rating:
1 to 3 Category318.7 227.4 123.6 123.5 39.8 39.1 113.4 3.0 988.5 
4 to 5 Category968.5 1,040.0 637.8 447.3 153.0 256.9 181.5 17.5 3,702.5 
6 to 9 Category 7.7 22.7 — 49.1 — — 2.5 — 82.0 
Total CRE1,294.9 1,290.1 761.4 619.9 192.8 296.0 297.4 20.5 4,773.0 
Non-U.S.
Risk Rating:
1 to 3 Category991.9 46.2 109.6 14.8 — 6.5 1,158.3 — 2,327.3 
4 to 5 Category459.0 — — — — 214.9 89.5 1.8 765.2 
6 to 9 Category0.1 — — 23.1 — — 15.4 — 38.6 
Total Non-U.S.1,451.0 46.2 109.6 37.9 — 221.4 1,263.2 1.8 3,131.1 
Other
Risk Rating:
1 to 3 Category993.9 — — — — — — — 993.9 
4 to 5 Category322.6 — — — — — — — 322.6 
Total Other1,316.5 — — — — — — — 1,316.5 
Total Commercial5,610.6 3,194.9 1,381.6 1,021.9 390.1 1,203.4 8,760.2 72.9 21,635.6 
Personal
Private Client
Risk Rating:
1 to 3 Category395.5 159.9 50.5 313.6 13.4 18.5 5,352.5 28.2 6,332.1 
4 to 5 Category430.3 755.1 192.4 191.3 38.7 160.0 5,728.6 267.2 7,763.6 
6 to 9 Category 0.9 — 0.1 — 18.6 — 3.7 — 23.3 
Total Private Client826.7 915.0 243.0 504.9 70.7 178.5 11,084.8 295.4 14,119.0 
RRE
Risk Rating:
1 to 3 Category871.6 666.7 567.7 168.1 102.9 750.8 128.4 7.9 3,264.1 
4 to 5 Category354.3 656.7 597.6 290.0 170.9 838.2 180.4 1.0 3,089.1 
6 to 9 Category — 6.8 1.5 1.1 3.7 35.9 11.3 — 60.3 
Total RRE1,225.9 1,330.2 1,166.8 459.2 277.5 1,624.9 320.1 8.9 6,413.5 
Non-U.S.
Risk Rating:
1 to 3 Category3.0 3.7 — — 4.6 2.3 124.6 — 138.2 
4 to 5 Category24.2 40.3 — 21.3 3.2 2.9 272.0 7.8 371.7 
6 to 9 Category — — — — — 0.1 — — 0.1 
Total Non-U.S.27.2 44.0 — 21.3 7.8 5.3 396.6 7.8 510.0 
Other
Risk Rating:
1 to 3 Category190.8 — — — — — — — 190.8 
4 to 5 Category24.4 — — — — — — — 24.4 
Total Other215.2 — — — — — — — 215.2 
Total Personal2,295.0 2,289.2 1,409.8 985.4 356.0 1,808.7 11,801.5 312.1 21,257.7 
Total Loans$7,905.6 $5,484.1 $2,791.4 $2,007.3 $746.1 $3,012.1 $20,561.7 $385.0 $42,893.3 
Past Due Loans by Segment and Class The following table provides balances and delinquency status of accrual and nonaccrual loans by segment and class, as well as the other real estate owned and nonaccrual asset balances, as of December 31, 2023 and 2022.
TABLE 66: DELINQUENCY STATUS
ACCRUALNONACCRUAL WITH NO ALLOWANCE
(In Millions)CURRENT30 – 59 DAYS
PAST DUE		60 – 89 DAYS
PAST DUE		90 DAYS
OR MORE
PAST DUE		TOTAL ACCRUALNONACCRUALTOTAL LOANS
December 31, 2023
Commercial
Commercial and Institutional$11,374.6 $163.7 $0.7 $— $11,539.0 $16.3 $11,555.3 $4.1 
Commercial Real Estate5,123.7 4.4 6.1 — 5,134.2 — 5,134.2 — 
Non-U.S.2,778.5 — — — 2,778.5 — 2,778.5 — 
Other5,944.8 — — — 5,944.8 — 5,944.8 — 
Total Commercial25,221.6 168.1 6.8 — 25,396.5 16.3 25,412.8 4.1 
Personal
Private Client14,240.0 63.9 24.8 11.0 14,339.7 20.3 14,360.0 18.3 
Residential Real Estate6,283.0 7.5 0.5 9.1 6,300.1 27.0 6,327.1 27.0 
Non-U.S.428.2 — 0.6 — 428.8 — 428.8 — 
Other1,088.3 — — — 1,088.3 — 1,088.3 — 
Total Personal22,039.5 71.4 25.9 20.1 22,156.9 47.3 22,204.2 45.3 
Total Loans$47,261.1 $239.5 $32.7 $20.1 $47,553.4 $63.6 $47,617.0 $49.4 
Other Real Estate Owned$1.5 
Total Nonaccrual Assets$65.1 
ACCRUALNONACCRUAL WITH NO ALLOWANCE
(In Millions)CURRENT30 – 59 DAYS
PAST DUE		60 – 89 DAYS
PAST DUE		90 DAYS
OR MORE
PAST DUE		TOTAL ACCRUALNONACCRUALTOTAL LOANS
December 31, 2022
Commercial
Commercial and Institutional$12,353.7 $40.2 $3.0 $0.7 $12,397.6 $17.4 $12,415.0 $4.4 
Commercial Real Estate4,761.5 1.3 — — 4,762.8 10.2 4,773.0 6.2 
Non-U.S.3,131.1 — — — 3,131.1 — 3,131.1 — 
Other1,316.5 — — — 1,316.5 — 1,316.5 — 
Total Commercial21,562.8 41.5 3.0 0.7 21,608.0 27.6 21,635.6 10.6 
Personal
Private Client13,843.5 192.3 29.9 53.3 14,119.0 — 14,119.0 — 
Residential Real Estate6,373.2 9.6 12.3 0.1 6,395.2 18.3 6,413.5 18.3 
Non-U.S509.9 — — 0.1 510.0 — 510.0 — 
Other215.2 — — — 215.2 — 215.2 — 
Total Personal20,941.8 201.9 42.2 53.5 21,239.4 18.3 21,257.7 18.3 
Total Loans$42,504.6 $243.4 $45.2 $54.2 $42,847.4 $45.9 $42,893.3 $28.9 
Other Real Estate Owned$— 
Total Nonaccrual Assets$45.9 
Financing Receivable, Modified
TABLE 67: LOAN MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY
YEAR ENDED DECEMBER 31, 2023
($ In Millions)LOAN MODIFICATION DETAILAMORTIZED COST BASIS% OF TOTAL SEGMENT
Commercial(1)
Commercial and InstitutionalTerm extension$16.7 0.14 %
Commercial Real EstatePrincipal and/or interest deferral— — 
Commercial Real EstateCombination of principal and/or interest deferral and term extension— — 
Total Commercial$16.7 0.07 %
Personal(1)
Private ClientTerm extension$— — %
Private ClientPrincipal and/or interest deferral18.3 0.13 
Residential Real EstatePrincipal and/or interest deferral1.0 0.02 
Residential Real EstateInterest rate concession— — 
Residential Real EstateCombination of principal and/or interest deferral and term extension4.7 0.07 
Total Personal$24.0 0.11 %
Total Loans $40.7 0.09 %
(1) Included are financially distressed modifications for which the respective loans had no amortized cost basis as of December 31, 2023 due to pay-downs or charge-offs.

The following table describes the financial effect of the modifications made to borrowers experiencing financial difficulty.
TABLE 68: FINANCIAL EFFECT OF MODIFICATIONS MADE TO BORROWERS EXPERIENCING FINANCIAL DIFFICULTY
FINANCIAL EFFECT
PRINCIPAL AND INTEREST DEFERRAL
Commercial
Commercial Real Estate
Northern Trust provided a weighted average of 6 months payment deferrals to borrowers for total deferred principal and interest of $32.5 million.
Personal
Residential Real Estate
Northern Trust provided a weighted average of 14 months payment deferrals to borrowers for immaterial principal and interest deferral amounts.
Private Client
Northern Trust provided payment deferrals to borrowers until collateral sale is executed for total principal and interest of $18.9 million.
TERM EXTENSION
Commercial
Commercial and Institutional
Northern Trust provided weighted average term extension of 12 months.
Commercial Real Estate
Northern Trust provided weighted average term extension of 6 months.
Personal
Residential Real Estate
Northern Trust provided weighted average term extension of 9 months.
Private Client
Northern Trust provided weighted average term extension of 60 months.
INTEREST RATE CONCESSION
Personal
Residential Real Estate
Northern Trust provided a 2% reduction in the weighted average contractual interest rates.
Number of Loans and Leases Modified in TDRs and Total Recorded Investments and Unpaid Principal Balances
The following table provides, by segment and class, the number of TDR modifications of loans entered into during the year ended December 31, 2022, and the recorded investments and unpaid principal balances as of December 31, 2022.

TABLE 69: TROUBLED DEBT RESTRUCTURINGS
($ In Millions)LOAN MODIFICATION DETAILNUMBER OF
LOANS		RECORDED
INVESTMENT		UNPAID
PRINCIPAL
BALANCE
December 31, 2022
Commercial
Commercial and InstitutionalInterest rate concession, extension of term, and other modification2 $0.6 $0.6 
Commercial Real EstateInterest rate concession and other modification1 31.6 32.5 
Total Commercial3 32.2 33.1 
Personal
Residential Real EstateInterest rate concession, deferrals of principal, extension of term, and other modification 3 0.2 0.2 
Private Client Interest rate concession and extension of term1 0.4 0.4 
Total Personal4 0.6 0.6 
Total Loans7 $32.8 $33.7 
Note: Period-end balances reflect all paydowns and charge-offs during the year.