XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.22.4

PENSION AND OTHER BENEFIT PLANS (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2022
PENSION AND OTHER BENEFIT PLANS |
Schedule of funded status of the Company's plans reconciled with amounts reported | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
(000’s omitted) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Change in benefit obligation: |  | ​ |  |  | ​ |  |  | ​ | ​ |  | ​ |
Benefit obligation at the beginning of year | ​ | $ | 183,270 | ​ | $ | 190,361 | ​ | $ | 1,529 | ​ | $ | 1,718
Service cost | ​ |  | 4,959 | ​ |  | 5,920 | ​ |  | 0 | ​ |  | 0
Interest cost | ​ |  | 5,334 | ​ |  | 5,036 | ​ |  | 68 | ​ |  | 44
Plan amendment / acquisition | ​ |  | 1,851 | ​ |  | 0 | ​ |  | 536 | ​ |  | 0
Participant contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Deferred actuarial (gain)/loss | ​ |  | (31,759) | ​ |  | (4,881) | ​ |  | (306) | ​ |  | (85)
Benefits paid | ​ |  | (12,294) | ​ |  | (13,166) | ​ |  | (171) | ​ |  | (148)
Benefit obligation at end of year | ​ |  | 151,361 | ​ |  | 183,270 | ​ |  | 1,656 | ​ |  | 1,529
Change in plan assets: | ​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | ​
Fair value of plan assets at beginning of year | ​ |  | 290,687 | ​ |  | 272,600 | ​ |  | 0 | ​ |  | 0
Actual return of plan assets | ​ |  | (34,967) | ​ |  | 27,614 | ​ |  | 0 | ​ |  | 0
Participant contributions | ​ |  | 0 | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Employer contributions | ​ |  | 906 | ​ |  | 3,639 | ​ |  | 171 | ​ |  | 148
Plan acquisition | ​ |  | 0 | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Benefits paid | ​ |  | (12,294) | ​ |  | (13,166) | ​ |  | (171) | ​ |  | (148)
Fair value of plan assets at end of year | ​ |  | 244,332 | ​ |  | 290,687 | ​ |  | 0 | ​ |  | 0
Over/(Under) funded status at year end | ​ | $ | 92,971 | ​ | $ | 107,417 | ​ | $ | (1,656) | ​ | $ | (1,529)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Amounts recognized in the consolidated statement of condition were: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Other assets | ​ | $ | 106,986 | ​ | $ | 127,538 | ​ | $ | 0 | ​ | $ | 0
Other liabilities | ​ |  | (14,015) | ​ |  | (20,121) | ​ |  | (1,656) | ​ |  | (1,529)
Amounts recognized in accumulated other comprehensive loss/(income) (“AOCI”) were: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |
Net loss | ​ | $ | 38,894 | ​ | $ | 16,977 | ​ | $ | 255 | ​ | $ | 585
Net prior service cost (credit) | ​ |  | 3,112 | ​ |  | 3,969 | ​ |  | (728) | ​ |  | (907)
Pre-tax AOCI | ​ |  | 42,006 | ​ |  | 20,946 | ​ |  | (473) | ​ |  | (322)
Taxes | ​ |  | (10,351) | ​ |  | (5,236) | ​ |  | 119 | ​ |  | 82
AOCI at year end | ​ | $ | 31,655 | ​ | $ | 15,710 | ​ | $ | (354) | ​ | $ | (240)
Schedule of Amounts recognized in accumulated other comprehensive income, net of tax | Amounts recognized in accumulated other comprehensive income, net of tax, for the year ended December 31, are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
(000’s omitted) |  | 2022 |  | 2021 |  | 2022 |  | 2021
Prior service cost/(credit) | ​ | $ | (648) | ​ | $ | (288) | ​ | $ | 135 | ​ | $ | 136
Net (gain) loss | ​ |  | 16,593 | ​ |  | (13,152) | ​ |  | (249) | ​ |  | (99)
Total | ​ | $ | 15,945 | ​ | $ | (13,440) | ​ | $ | (114) | ​ | $ | 37
​
Schedule of weighted-average assumptions used to determine the benefit obligations | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits |
​ |  | 2022 |  | 2021 |  | 2022 |  | 2021 |
Discount rate |  | 5.40 | % | 3.10 | % | 5.40 | % | 3.10 | %
Expected return on plan assets |  | 6.70 | % | 6.70 | % | N/A |  | N/A | ​
Rate of compensation increase | ​ | 4.50% for 2023, | ​ | 4.00% for 2022, | % | ​ | ​ | ​ | ​
​ |  | 3.50% for 2024 | + | 3.50% for 2023 | + | N/A | ​ | N/A | ​
Interest crediting rates | ​ | 6.00% while employed, | ​ | 6.00% while employed, | ​ | ​ | ​ | ​ | ​
​ | ​ | 3.55% after termination | ​ | 1.94% after termination | ​ | N/A | ​ | N/A | ​
​
Schedule of net periodic benefit cost | The net periodic benefit cost as of December 31 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits
(000’s omitted) |  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020
Service cost | ​ | $ | 4,959 | ​ | $ | 5,920 | ​ | $ | 5,750 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 0
Interest cost | ​ |  | 5,334 | ​ |  | 5,036 | ​ |  | 5,657 | ​ |  | 68 | ​ |  | 44 | ​ |  | 57
Expected return on plan assets | ​ |  | (19,025) | ​ |  | (18,783) | ​ |  | (16,306) | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Plan amendment | ​ |  | (556) | ​ |  | 0 | ​ |  | (637) | ​ |  | 0 | ​ |  | 0 | ​ |  | 0
Amortization of unrecognized net loss | ​ |  | 842 | ​ |  | 3,600 | ​ |  | 3,239 | ​ |  | 23 | ​ |  | 45 | ​ |  | 40
Amortization of prior service cost | ​ |  | 615 | ​ |  | 379 | ​ |  | 241 | ​ |  | (179) | ​ |  | (179) | ​ |  | (179)
Net periodic (benefit) | ​ | $ | (7,831) | ​ | $ | (3,848) | ​ | $ | 2,056 | ​ | $ | (88) | ​ | $ | (90) | ​ | $ | (82)
​
Schedule of weighted-average assumptions used to determine the net periodic pension cost | The weighted-average assumptions used to determine the net periodic pension cost for the years ended December 31 are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Pension Benefits | ​ | Post-retirement Benefits |
​ |  | 2022 |  | 2021 |  | 2020 |  | 2022 |  | 2021 |  | 2020 |
Discount rate |  | 3.10 | % | 2.80 | % | 3.50 | % | 3.10 | % | 2.80 | % | 3.60 | %
Expected return on plan assets |  | 6.70 | % | 7.00 | % | 7.00 | % | N/A |  | N/A |  | N/A | ​
Rate of compensation |  | 4.00% for 2022, | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
increase | ​ | 3.50% for 2023 | + | 3.50 | % | 3.50 | % | N/A |  | N/A |  | N/A | ​
Interest crediting rates | ​ | 6.00% while employed, | ​ | 6.00% while employed, | ​ | 6.00% while employed, | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | 1.94% after termination | ​ | 1.42% after termination | ​ | 2.16% after termination | ​ | N/A | ​ | N/A | ​ | N/A | ​
​
Schedule of amount of benefit payments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Pension | ​ | ​ | Post-retirement
(000’s omitted) |  | ​ | Benefits |  | ​ | Benefits
2023 | ​ | $ | 11,583 | ​ | $ | 192
2024 | ​ |  | 11,965 | ​ |  | 154
2025 | ​ |  | 11,693 | ​ |  | 152
2026 | ​ |  | 12,934 | ​ |  | 150
2027 | ​ |  | 12,723 | ​ |  | 148
2028-2032 | ​ |  | 64,686 | ​ |  | 972
​
Schedule of fair value of defined benefit plan assets by asset category | The fair values of the Company’s defined benefit pension plan assets at December 31, 2022 by asset category are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quoted Prices | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | in Active | ​ | Significant | ​ | Significant | ​ |  | ​
​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ |  | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ |  | ​
Asset category (000’s omitted) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents | ​ | $ | 18,625 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 18,625
Equity securities: | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
U.S. large-cap | ​ |  | 52,682 | ​ |  | 0 | ​ |  | 0 | ​ |  | 52,682
U.S. mid/small cap | ​ |  | 16,432 | ​ |  | 0 | ​ |  | 0 | ​ |  | 16,432
CBU common stock | ​ |  | 6,427 | ​ |  | 0 | ​ |  | 0 | ​ |  | 6,427
International | ​ |  | 51,725 | ​ |  | 0 | ​ |  | 0 | ​ |  | 51,725
Other | ​ |  | 1,273 | ​ |  | 0 | ​ |  | 0 | ​ |  | 1,273
​ | ​ |  | 128,539 | ​ |  | 0 | ​ |  | 0 | ​ |  | 128,539
​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Fixed income securities: | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Government securities | ​ |  | 44,995 | ​ |  | 11,567 | ​ |  | 0 | ​ |  | 56,562
Investment grade bonds | ​ |  | 12,964 | ​ |  | 5,538 | ​ |  | 0 | ​ |  | 18,502
High yield(a) | ​ |  | 7,134 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,134
​ | ​ |  | 65,093 | ​ |  | 17,105 | ​ |  | 0 | ​ |  | 82,198
​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Other investments (b) | ​ |  | 14,342 | ​ |  | 0 | ​ |  | 0 | ​ |  | 14,342
​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Total (c) | ​ | $ | 226,599 | ​ | $ | 17,105 | ​ | $ | 0 | ​ | $ | 243,704
​ The fair values of the Company’s defined benefit pension plan assets at December 31, 2021 by asset category are as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Quoted Prices | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | in Active | ​ | Significant | ​ | Significant | ​ | ​ | ​
​ | ​ | Markets for | ​ | Observable | ​ | Unobservable | ​ | ​ | ​
​ | ​ | Identical Assets | ​ | Inputs | ​ | Inputs | ​ | ​ | ​
Asset category (000’s omitted) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Cash equivalents | ​ | $ | 19,605 | ​ | $ | 0 | ​ | $ | 0 | ​ | $ | 19,605
Equity securities: | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
U.S. large-cap | ​ |  | 75,180 | ​ |  | 0 | ​ |  | 0 | ​ |  | 75,180
U.S. mid/small cap | ​ |  | 12,052 | ​ |  | 0 | ​ |  | 0 | ​ |  | 12,052
CBU common stock | ​ |  | 7,604 | ​ |  | 0 | ​ |  | 0 | ​ |  | 7,604
International | ​ |  | 73,891 | ​ |  | 0 | ​ |  | 0 | ​ |  | 73,891
Other | ​ | ​ | 1,091 | ​ | ​ | 0 | ​ | ​ | 0 | ​ | ​ | 1,091
​ | ​ |  | 169,818 | ​ |  | 0 | ​ |  | 0 | ​ |  | 169,818
​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Fixed income securities: | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Government securities | ​ |  | 19,988 | ​ |  | 5,974 | ​ |  | 0 | ​ |  | 25,962
Investment grade bonds | ​ |  | 41,374 | ​ |  | 136 | ​ |  | 0 | ​ |  | 41,510
High yield(a) | ​ |  | 8,625 | ​ |  | 0 | ​ |  | 0 | ​ |  | 8,625
​ | ​ |  | 69,987 | ​ |  | 6,110 | ​ |  | 0 | ​ |  | 76,097
​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Other investments (b) | ​ |  | 24,727 | ​ |  | 0 | ​ |  | 0 | ​ |  | 24,727
​ | ​ |  | ​ | ​ |  | ​ | ​ |  |  | ​ |  | ​
Total (c) | ​ | $ | 284,137 | ​ | $ | 6,110 | ​ | $ | 0 | ​ | $ | 290,247
​
(a) | This category is exchange-traded funds representing a diversified index of high yield corporate bonds.
(b) | This category is comprised of exchange-traded funds and mutual funds holding non-traditional investment classes including private equity funds and alternative exchange funds.
(c) | Excludes dividends and interest receivable totaling $0.6 million and $0.4 million at December 31, 2022 and 2021, respectively.
​

X
- Definition Tabular disclosure of after tax amounts recognized in accumulated other comprehensive loss (income). + References No definition available. + Details
Name: | cbu_AfterTaxAmountsRecognizedInAccumulatedOtherComprehensiveLossIncomeTableTextBlock
Namespace Prefix: | cbu_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition A schedule of the weighted-average assumptions used to determine benefit obligations for defined benefit pension and other postretirement plans. + References No definition available. + Details
Name: | cbu_WeightedAverageAssumptionsUsedToDetermineBenefitObligationsTableTextBlock
Namespace Prefix: | cbu_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAllocationOfPlanAssetsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of assumption used to determine benefit obligation and net periodic benefit cost of defined benefit plan. Includes, but is not limited to, discount rate, rate of compensation increase, expected long-term rate of return on plan assets and interest crediting rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfAssumptionsUsedTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2417-114920 + Details
Name: | us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration