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Retirement Benefit Plans (Tables)
 12 Months Ended
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 Obligation39,763 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 Obligation42,914 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 Termination441 — — 
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 
Amendments526 — — 
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 Assets8,964 — — 
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 Assets7,856 — — 
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 Cost441 — — 
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 Period526 — — 
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)$(2,801)
Prior Service Cost1,150 291 160 
Total Accumulated Other Comprehensive (Loss) Income, Before Tax$(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 Cost840 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 Rate6.15 %6.21 %6.12 %
Rate of Compensation Increase4.00 %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 Rate5.52 %5.53 %5.51 %
Rate of Compensation Increase4.00 %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 Rate5.52 %5.53 %5.51 %
Expected Long-Term Return on Plan Assets6.50 %
Rate of Compensation Increase4.00 %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 Rate5.59 %5.61 %5.62 %
Expected Long-Term Return on Plan Assets6.50 %
Rate of Compensation Increase3.50 %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 Rate3.30 %5.61 %3.32 %
Expected Long-Term Return on Plan Assets6.50 %
Rate of Compensation Increase3.50 %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 CategoryQuoted Prices
in Active Markets
for Identical Assets
(Level 1)		Significant Other Observable Inputs
(Level 2)		Significant Unobservable Inputs
(Level 3)		TotalPercent of TotalTarget Allocation MinimumTarget Allocation Maximum
December 31, 2024
Cash$— $— $— $— — %— %15.0 %
Interest-Bearing Money Market Fund2,699 — — 2,699 4.2 %— %15.0 %
Arrow Common Stock5,593 — — 5,593 8.8 %— %10.0 %
North Country Funds - Equity 118,740 — — 18,740 29.3 %
Other Mutual Funds - Equity26,598 — — 26,598 41.6 %
Total Equity Funds45,338 — — 45,338 70.9 %55.0 %85.0 %
Other Mutual Funds - Fixed Income10,263 — — 10,263 16.1 %
Total Fixed Income Funds10,263 — — 10,263 16.1 %10.0 %30.0 %
  Total$63,893 $— $— $63,893 100.0 %
December 31, 2023
Cash
Interest-Bearing Money Market Fund1,257 — — 1,257 2.1 %— %15.0 %
Arrow Common Stock5,443 — — 5,443 9.2 %— %10.0 %
North Country Funds - Equity 120,012 — — 20,012 33.8 %
Other Mutual Funds - Equity19,883 — — 19,883 33.6 %
Total Equity Funds39,895 — — 39,895 67.4 %55.0 %85.0 %
Other Mutual Funds - Fixed Income12,012 — — 12,012 20.3 %
Total Fixed Income Funds12,012 — — 12,012 20.3 %10.0 %30.0 %
Alternative ETF592 — — 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 
20263,037 549 657 
20273,293 531 662 
20283,294 501 628 
20293,129 471 615 
2030 - 203416,966 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