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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2024
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | The following tables set forth changes in the plans’ benefit obligations (projected benefit obligation for pension benefits and accumulated benefit obligation for postretirement benefits) and changes in the plans’ assets and the funded status of the pension plans and other postretirement benefit plan at December 31: Schedule of Defined Benefit Plan Disclosures
| Employees' Pension Plan |  | Select Executive Retirement Plan |  | Postretirement Benefit Plans
Defined Benefit Plan Funded Status |  |  |  |  |
December 31, 2024 |  |  |  |  |
Fair Value of Plan Assets | $ | 63,893 |  |  | $ | — |  |  | $ | — |
Benefit Obligation | 39,763 |  |  | 4,940 |  |  | 5,550 |
Funded Status of Plan | $ | 24,130 |  |  | $ | (4,940) |  |  | $ | (5,550) |
December 31, 2023 |  |  |  |  |
Fair Value of Plan Assets | $ | 59,199 |  |  | $ | — |  |  | $ | — |
Benefit Obligation | 42,914 |  |  | 6,904 |  |  | 6,221 |
Funded Status of Plan | $ | 16,285 |  |  | $ | (6,904) |  |  | $ | (6,221) |
| Employees' Pension Plan |  | Select Executive Retirement Plan |  | Postretirement Benefit Plans
Change in Benefit Obligation |  |  |  |  |
Benefit Obligation, at January 1, 2024 | $ | 42,914 |  |  | $ | 6,904 |  |  | $ | 6,221 |
Service Cost 1 | 1,692 |  |  | 78 |  |  | 45 |
Interest Cost 2 | 2,242 |  |  | 320 |  |  | 320 |
Plan Participants' Contributions | — |  |  | — |  |  | 483 |
Amendments / Curtailments / Special Termination | 441 |  |  | — |  |  | — |
Actuarial Loss | (3,256) |  |  | (1,770) |  |  | (497) |
Benefits Paid | (4,270) |  |  | (592) |  |  | (1,022) |
Benefit Obligation, at December 31, 2024 | $ | 39,763 |  |  | $ | 4,940 |  |  | $ | 5,550 |
Benefit Obligation, at January 1, 2023 | $ | 39,528 |  |  | $ | 6,070 |  |  | $ | 6,482 |
Service Cost 1 | 1,593 |  |  | 570 |  |  | 56 |
Interest Cost 2 | 2,099 |  |  | 336 |  |  | 332 |
Plan Participants' Contributions | — |  |  | — |  |  | 459 |
Amendments | 526 |  |  | — |  |  | — |
Actuarial Gain (Loss) | 2,125 |  |  | 357 |  |  | (397) |
Benefits Paid | (2,957) |  |  | (429) |  |  | (711) |
Benefit Obligation, at December 31, 2023 | $ | 42,914 |  |  | $ | 6,904 |  |  | $ | 6,221 |
Change in Fair Value of Plan Assets |  |  |  |  |
Fair Value of Plan Assets, at January 1, 2024 | $ | 59,199 |  |  | $ | — |  |  | $ | — |
Actual Return on Plan Assets | 8,964 |  |  | — |  |  | — |
Employer Contributions | — |  |  | 592 |  |  | 539 |
Plan Participants' Contributions | — |  |  | — |  |  | 483 |
Benefits Paid | (4,270) |  |  | (592) |  |  | (1,022) |
Fair Value of Plan Assets, at December 31, 2024 | $ | 63,893 |  |  | $ | — |  |  | $ | — |
Fair Value of Plan Assets, at January 1, 2023 | $ | 54,300 |  |  | $ | — |  |  | $ | — |
Actual Return on Plan Assets | 7,856 |  |  | — |  |  | — |
Employer Contributions | — |  |  | 429 |  |  | 252 |
Plan Participants' Contributions | — |  |  | — |  |  | 459 |
Benefits Paid | (2,957) |  |  | (429) |  |  | (711) |
Fair Value of Plan Assets, at December 31, 2023 | $ | 59,199 |  |  | $ | — |  |  | $ | — |
Accumulated Benefit Obligation at December 31, 2024 | $ | 39,763 |  |  | $ | 4,940 |  |  | $ | 5,550 |
| Employees' Pension Plan |  | Select Executive Retirement Plan |  | Postretirement Benefit Plans
Amounts Recognized in the Consolidated Balance Sheets |  |  |  |  |
December 31, 2024 |  |  |  |  |
Prepaid Pension Asset | $ | 24,130 |  |  | $ | — |  |  | $ | — |
Accrued Benefit Liability | — |  |  | (4,940) |  |  | (5,550) |
Net Benefit (Expense) Recognized | $ | 24,130 |  |  | $ | (4,940) |  |  | $ | (5,550) |
December 31, 2023 |  |  |  |  |
Prepaid Pension Asset | $ | 16,285 |  |  | $ | — |  |  | $ | — |
Accrued Benefit Liability | — |  |  | (6,904) |  |  | (6,221) |
Net Benefit (Expense) Recognized | $ | 16,285 |  |  | $ | (6,904) |  |  | $ | (6,221) |
Amounts Recognized in Other Comprehensive (Loss) Income |  |  |  |  |
For the Year Ended December 31, 2024 |  |  |  |  |
Net Unamortized Gain Arising During the Period | $ | (8,509) |  |  | $ | (1,770) |  |  | $ | (498) |
Prior Service Cost | 441 |  |  | — |  |  | — |
Amortization of Net (Loss) Gain | — |  |  | (24) |  |  | 337 |
Amortization of Prior Service Cost | (131) |  |  | (39) |  |  | (102) |
Total Other Comprehensive Loss for Pension and Other Postretirement Benefit Plans | $ | (8,199) |  |  | $ | (1,833) |  |  | $ | (263) |
For the Year Ended December 31, 2023 |  |  |  |  |
Net Unamortized Loss (Gain) Arising During the Period | $ | (2,315) |  |  | $ | 358 |  |  | $ | (397) |
Net Prior Service Cost Arising During the Period | 526 |  |  | — |  |  | — |
Amortization of Net (Loss) Gain | (118) |  |  | (73) |  |  | 353 |
Amortization of Prior Service Cost | (62) |  |  | (39) |  |  | (104) |
Total Other Comprehensive (Loss) Income for Pension and Other Postretirement Benefit Plans | $ | (1,969) |  |  | $ | 246 |  |  | $ | (148) |
For the Year Ended December 31, 2022 |  |  |  |  |
Net Unamortized Loss (Gain) Arising During the Period | $ | 9,492 |  |  | $ | (983) |  |  | $ | (1,571) |
Amortization of Net (Loss) Gain | — |  |  | (212) |  |  | 156 |
Amortization of Prior Service Cost | (78) |  |  | (44) |  |  | (106) |
Settlement Cost | (577) |  |  | — |  |  | — |
Total Other Comprehensive Income (Loss) for Pension and Other Postretirement Benefit Plans | $ | 8,837 |  |  | $ | (1,239) |  |  | $ | (1,521) |
Accumulated Other Comprehensive Income |  |  |  |  |
December 31, 2024 |  |  |  |  |
Net Actuarial Gain | $ | (4,369) |  |  | $ | (55) |  |  | $ | (2,801) |
Prior Service Cost | 1,150 |  |  | 291 |  |  | 160 |
Total Accumulated Other Comprehensive (Loss) Income, Before Tax | $ | (3,219) |  |  | $ | 236 |  |  | $ | (2,641) |
| Employees' Pension Plan |  | Select Executive Retirement Plan |  | Postretirement Benefit Plans
December 31, 2023 |  |  |  |  |
Net Actuarial Loss (Gain) | $ | 4,141 |  |  | $ | 1,739 |  |  | $ | (2,641) |
Prior Service Cost | 840 |  |  | 330 |  |  | 262 |
Total Accumulated Other Comprehensive Income (Loss), Before Tax | $ | 4,981 |  |  | $ | 2,069 |  |  | $ | (2,379) |
Net Periodic Benefit Cost |  |  |  |  |
For the Year Ended December 31, 2024 |  |  |  |  |
Service Cost 1 | $ | 1,692 |  |  | $ | 78 |  |  | $ | 45 |
Interest Cost 2 | 2,242 |  |  | 320 |  |  | 320 |
Expected Return on Plan Assets 2 | (3,710) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 | 131 |  |  | 39 |  |  | 102 |
Amortization of Net Loss (Gain) 2 | — |  |  | 25 |  |  | (337) |
Net Periodic Benefit Cost | $ | 355 |  |  | $ | 462 |  |  | $ | 130 |
For the Year Ended December 31, 2023 |  |  |  |  |
Service Cost 1 | $ | 1,593 |  |  | $ | 570 |  |  | $ | 56 |
Interest Cost 2 | 2,099 |  |  | 336 |  |  | 332 |
Expected Return on Plan Assets 2 | (3,416) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 | 62 |  |  | 39 |  |  | 104 |
Amortization of Net Loss (Gain) 2 | 118 |  |  | 73 |  |  | (353) |
Net Periodic Benefit Cost | $ | 456 |  |  | $ | 1,018 |  |  | $ | 139 |
For the Year Ended December 31, 2022 |  |  |  |  |
Service Cost 1 | $ | 1,877 |  |  | $ | 835 |  |  | $ | 90 |
Interest Cost 2 | 1,439 |  |  | 225 |  |  | 248 |
Expected Return on Plan Assets 2 | (4,314) |  |  | — |  |  | — |
Amortization of Prior Service Cost 2 | 77 |  |  | 44 |  |  | 106 |
Amortization of Net Loss 2 | — |  |  | 212 |  |  | (156) |
Settlement Cost 2 | 577 |  |  | — |  |  | — |
Net Periodic Benefit (Income) Cost | $ | (344) |  |  | $ | 1,316 |  |  | $ | 288 |
Weighted-Average Assumptions Used in Calculating Benefit Obligation |  |  |  |  |
December 31, 2024 |  |  |  |  |
Discount Rate | 6.15 | % |  | 6.21 | % |  | 6.12 | %
Rate of Compensation Increase | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Interest Rate Credit for Determining Projected Cash Balance Account | 4.54 | % |  | 4.54 | % |  |
Interest Rates segments to Annuitize Cash Balance Account (Segment 1, Segment 2 and Segment 3, respectively) | 4.66%, 5.25% and 5.57% |  | 4.66%, 5.25% and 5.57% |  |
Interest Rates to Convert Annuities to Actuarially Equivalent Lump Sum Amounts (Segment 1, Segment 2 and Segment 3, respectively) | 4.66%,5.25% and 5.57% |  | 4.66%, 5.25% and 5.57% |  |
December 31, 2023 |  |  |  |  |
Discount Rate | 5.52 | % |  | 5.53 | % |  | 5.51 | %
Rate of Compensation Increase | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Interest Rate Credit for Determining Projected Cash Balance Account | 4.66 | % |  | 4.66 | % |  |
| Employees' Pension Plan |  | Select Executive Retirement Plan |  | Postretirement Benefit Plans
Weighted-Average Assumptions Used in Calculating Net Periodic Benefit Cost |  |  |  |  |
December 31, 2024 |  |  |  |  |
Discount Rate | 5.52 | % |  | 5.53 | % |  | 5.51 | %
Expected Long-Term Return on Plan Assets | 6.50 | % |  |  |  |
Rate of Compensation Increase | 4.00 | % |  | 4.00 | % |  | 4.00 | %
Interest Rate Credit for Determining Projected Cash Balance Account | 4.66 | % |  | 4.66 | % |  |
Interest Rates to Annuitize Cash Balance Account (Segment 1, Segment 2, and Segment 3, respectively) | 4.66%, 5.25% and 5.57% |  | 4.66%,5.25% and 5.57% |  |
Interest Rates to Convert Annuities to Actuarially Equivalent Lump Sum Amounts (Segment 1, Segment 2 and Segment 3, respectively) | 4.66%, 5.25% and 5.57% |  | 4.66%, 5.25% and 5.57% |  |
December 31, 2023 |  |  |  |  |
Discount Rate | 5.59 | % |  | 5.61 | % |  | 5.62 | %
Expected Long-Term Return on Plan Assets | 6.50 | % |  |  |  |
Rate of Compensation Increase | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Interest Rate Credit for Determining Projected Cash Balance Account | 3.99 | % |  | 3.99 | % |  |
Interest Rates to Annuitize Cash Balance Account (Segment 1, Segment 2, and Segment 3, respectively) | 5.50%, 5.76% and 5.83% |  | 5.50%, 5.76% and 5.83% |  |
Interest Rates to Convert Annuities to Actuarially Equivalent Lump Sum Amounts (Segment 1, Segment 2 and Segment 3, respectively) | 5.50%, 5.76% and 5.83% |  | 5.50%, 5.76% and 5.76% |  |
December 31, 2022 |  |  |  |  |
Discount Rate | 3.30 | % |  | 5.61 | % |  | 3.32 | %
Expected Long-Term Return on Plan Assets | 6.50 | % |  |  |  |
Rate of Compensation Increase | 3.50 | % |  | 3.50 | % |  | 3.50 | %
Interest Rate Credit for Determining Projected Cash Balance Account | 3.00 | % |  | 3.99 | % |  |
Interest Rates to Annuitize Cash Balance Account (Segment 1, Segment 2, and Segment 3, respectively) | 5.09%, 5.60% and 5.41% |  | 5.09%, 5.60% and 5.41% |  |
Interest Rates to Convert Annuities to Actuarially Equivalent Lump Sum Amounts (Segment 1, Segment 2 and Segment 3, respectively) | 5.09%, 5.60% and 5.41% |  | 5.09%, 5.60% and 5.41% |  |
Footnotes: 1.Included in Salaries and Employee Benefits on the Consolidated Statements of Income 2.Included in Other Operating Expense on the Consolidated Statements of Income Schedule of Defined Benefit Plan Disclosures Information about Defined Benefit Plan Assets - Employees' Pension Plan
Fair Value Measurements Using:
Asset Category | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | Total |  | Percent of Total |  | Target Allocation Minimum |  | Target Allocation Maximum
December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | — | % |  | — | % |  | 15.0 | %
Interest-Bearing Money Market Fund | 2,699 |  |  | — |  |  | — |  |  | 2,699 |  |  | 4.2 | % |  | — | % |  | 15.0 | %
Arrow Common Stock | 5,593 |  |  | — |  |  | — |  |  | 5,593 |  |  | 8.8 | % |  | — | % |  | 10.0 | %
North Country Funds - Equity 1 | 18,740 |  |  | — |  |  | — |  |  | 18,740 |  |  | 29.3 | % |  |  |  |
Other Mutual Funds - Equity | 26,598 |  |  | — |  |  | — |  |  | 26,598 |  |  | 41.6 | % |  |  |  |
Total Equity Funds | 45,338 |  |  | — |  |  | — |  |  | 45,338 |  |  | 70.9 | % |  | 55.0 | % |  | 85.0 | %
Other Mutual Funds - Fixed Income | 10,263 |  |  | — |  |  | — |  |  | 10,263 |  |  | 16.1 | % |  |  |  |
Total Fixed Income Funds | 10,263 |  |  | — |  |  | — |  |  | 10,263 |  |  | 16.1 | % |  | 10.0 | % |  | 30.0 | %
Total | $ | 63,893 |  |  | $ | — |  |  | $ | — |  |  | $ | 63,893 |  |  | 100.0 | % |  |  |  |
December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  |  |  |  |  |  |  |
Interest-Bearing Money Market Fund | 1,257 |  |  | — |  |  | — |  |  | 1,257 |  |  | 2.1 | % |  | — | % |  | 15.0 | %
Arrow Common Stock | 5,443 |  |  | — |  |  | — |  |  | 5,443 |  |  | 9.2 | % |  | — | % |  | 10.0 | %
North Country Funds - Equity 1 | 20,012 |  |  | — |  |  | — |  |  | 20,012 |  |  | 33.8 | % |  |  |  |
Other Mutual Funds - Equity | 19,883 |  |  | — |  |  | — |  |  | 19,883 |  |  | 33.6 | % |  |  |  |
Total Equity Funds | 39,895 |  |  | — |  |  | — |  |  | 39,895 |  |  | 67.4 | % |  | 55.0 | % |  | 85.0 | %
Other Mutual Funds - Fixed Income | 12,012 |  |  | — |  |  | — |  |  | 12,012 |  |  | 20.3 | % |  |  |  |
Total Fixed Income Funds | 12,012 |  |  | — |  |  | — |  |  | 12,012 |  |  | 20.3 | % |  | 10.0 | % |  | 30.0 | %
Alternative ETF | 592 |  |  | — |  |  | — |  |  | 592 |  |  | 1.0 | % |  | — | % |  | 20.0 | %
Total | $ | 59,199 |  |  | $ | — |  |  | $ | — |  |  | $ | 59,199 |  |  | 100.0 | % |  |  |  |
Footnote: 1 The North Country Funds - Equity is a publicly traded mutual funds advised by Arrow's subsidiary, North Country Investment Advisers, Inc. Schedule of Defined Benefit Plan Disclosures
| Employees' Pension Plan |  | Select Executive Retirement Plan |  | Postretirement Benefit Plans
Expected Future Benefit Payments |  |  |  |  |
2025 | $ | 3,679 |  |  | $ | 579 |  |  | $ | 642 |
2026 | 3,037 |  |  | 549 |  |  | 657 |
2027 | 3,293 |  |  | 531 |  |  | 662 |
2028 | 3,294 |  |  | 501 |  |  | 628 |
2029 | 3,129 |  |  | 471 |  |  | 615 |
2030 - 2034 | 16,966 |  |  | 1,992 |  |  | 2,520 |
Estimated Contributions During 2025 | $ | — |  |  | $ | 579 |  |  | $ | 642 |
Assumed Health Care Cost Trend Rates |  |  |  |  |
December 31, 2024 |  |  |  |  |
Health Care Cost Trend Rate Assumed for Next Year |  |  |  |  | 7.75 | %
Rate to which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate) |  |  |  |  | 4.04 | %
Year that the Rate Reaches the Ultimate Trend Rate |  |  |  |  | 2075
December 31, 2023 |  |  |  |  |
Health Care Cost Trend Rate Assumed for Next Year |  |  |  |  | 7.75 | %
Rate to which the Cost Trend Rate is Assumed to Decline (the Ultimate Trend Rate) |  |  |  |  | 4.04 | %
Year that the Rate Reaches the Ultimate Trend Rate |  |  |  |  | 2075

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- 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 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -SubTopic 20 -Topic 715 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-3 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-4 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-2 + Details
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