SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) - SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) (Details) - NBT Bancorp Inc. 401(k) and Employee Stock Ownership Plan [Member]
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12 Months Ended |
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Dec. 31, 2025
USD ($)
shares
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Asset held for investment |
$ 414,701,477
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| Participant loans receivable [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Party-in-interest |
true
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[1] |
| Description of investment |
Interest rates [Member]
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[1] |
| Participant directed status |
Participant-Directed Investments [Member]
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[1],[2] |
| Participant loans receivable |
$ 3,492,310
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[1] |
| Investment, Identifier [Axis]: American Fund EUPAC Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
American Fund EUPAC Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
125,302
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 7,579,546
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| Investment, Identifier [Axis]: American Funds New Perspective Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
American Funds New Perspective Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
198,969
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 14,035,242
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| Investment, Identifier [Axis]: Cash [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Cash [Member]
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| Description of investment |
Cash [Member]
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 31,469
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| Investment, Identifier [Axis]: Columbia Dividend Income Fund S [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Columbia Dividend Income Fund S [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
376,740
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 13,660,606
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| Investment, Identifier [Axis]: DFA Emerging Markets Portfolio Institutional [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
DFA Emerging Markets Portfolio Institutional [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
37,254
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 1,383,225
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| Investment, Identifier [Axis]: DFA US Sustainability Core 1 Portfolio [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
DFA US Sustainability Core 1 Portfolio [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
20,041
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 1,049,761
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| Investment, Identifier [Axis]: Dodge & Cox Income Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Dodge & Cox Income Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
740,667
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 9,517,569
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| Investment, Identifier [Axis]: Federated Hermes Capital Preservation Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Federated Hermes Capital Preservation Fund [Member]
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| Description of investment |
Stable Value Fund [Member]
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 17,933,465
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| Investment, Identifier [Axis]: Fidelity 500 Index Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Fidelity 500 Index Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
193,452
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| Participant directed status |
Participant-Directed Investments [Member]
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[2] |
| Current value |
$ 45,987,495
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| Investment, Identifier [Axis]: Fidelity Inflation Protected Bond Index Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Fidelity Inflation Protected Bond Index Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
76,406
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 696,823
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| Investment, Identifier [Axis]: NBT Bancorp Inc. [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Party-in-interest |
true
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[1] |
| Identity of issuer, borrower, lessor, or similar party |
NBT Bancorp Inc. [Member]
|
[1] |
| Description of investment |
Common Stock of NBT Bancorp Inc. [Member]
|
[1] |
| Number of shares (in Shares) | shares |
724,330
|
[1] |
| Participant directed status |
Participant-Directed Investments [Member]
|
[1],[2] |
| Current value |
$ 30,074,182
|
[1] |
| Investment, Identifier [Axis]: Schwab Value Advantage Money Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Party-in-interest |
true
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[1] |
| Identity of issuer, borrower, lessor, or similar party |
Schwab Value Advantage Money Fund [Member]
|
[1] |
| Description of investment |
Money Market Funds [Member]
|
[1] |
| Participant directed status |
Participant-Directed Investments [Member]
|
[1],[2] |
| Current value |
$ 519
|
[1] |
| Investment, Identifier [Axis]: T-Rowe Price Dividend Growth Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Dividend Growth Fund [Member]
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| Description of investment |
Mutual Funds [Member]
|
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| Number of shares (in Shares) | shares |
139,291
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 11,364,716
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| Investment, Identifier [Axis]: T-Rowe Price Growth Stock Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Growth Stock Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
400,662
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 43,087,176
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| Investment, Identifier [Axis]: T-Rowe Price Mid Cap-Growth Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Mid Cap-Growth Fund [Member]
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| Description of investment |
Mutual Funds [Member]
|
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| Number of shares (in Shares) | shares |
119,864
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 11,655,580
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| Investment, Identifier [Axis]: T-Rowe Price Retirement 2010 Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement 2010 Fund [Member]
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| Description of investment |
Mutual Funds [Member]
|
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| Number of shares (in Shares) | shares |
84,112
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 1,345,785
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| Investment, Identifier [Axis]: T-Rowe Price Retirement 2020 Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement 2020 Fund [Member]
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| Description of investment |
Mutual Funds [Member]
|
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| Number of shares (in Shares) | shares |
899,776
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 17,761,583
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| Investment, Identifier [Axis]: T-Rowe Price Retirement 2030 Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement 2030 Fund [Member]
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| Description of investment |
Mutual Funds [Member]
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| Number of shares (in Shares) | shares |
1,997,972
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 55,443,730
|
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| Investment, Identifier [Axis]: T-Rowe Price Retirement 2040 Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement 2040 Fund [Member]
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| Description of investment |
Mutual Funds [Member]
|
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| Number of shares (in Shares) | shares |
1,359,620
|
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 46,770,911
|
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| Investment, Identifier [Axis]: T-Rowe Price Retirement 2050 Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement 2050 Fund [Member]
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| Description of investment |
Mutual Funds [Member]
|
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| Number of shares (in Shares) | shares |
1,606,807
|
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| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 34,771,297
|
|
| Investment, Identifier [Axis]: T-Rowe Price Retirement 2060 Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement 2060 Fund [Member]
|
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| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
486,037
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 9,229,852
|
|
| Investment, Identifier [Axis]: T-Rowe Price Retirement Balance Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Retirement Balance Fund [Member]
|
|
| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
110,543
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 1,548,701
|
|
| Investment, Identifier [Axis]: T-Rowe Price Small-Capital Value Fund [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
T-Rowe Price Small-Capital Value Fund [Member]
|
|
| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
174,660
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 8,951,336
|
|
| Investment, Identifier [Axis]: Vanguard Balanced Index Fund Institutional [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Vanguard Balanced Index Fund Institutional [Member]
|
|
| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
137,779
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 7,138,315
|
|
| Investment, Identifier [Axis]: Vanguard Intermediate US Treasury [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Vanguard Intermediate US Treasury [Member]
|
|
| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
393,101
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 3,954,595
|
|
| Investment, Identifier [Axis]: Vanguard Mid-Cap Index Fund Institutional [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Vanguard Mid-Cap Index Fund Institutional [Member]
|
|
| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
179,727
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 14,266,742
|
|
| Investment, Identifier [Axis]: Vanguard Short Term Bond Index Fund Admiral [Member] |
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
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| Identity of issuer, borrower, lessor, or similar party |
Vanguard Short Term Bond Index Fund Admiral [Member]
|
|
| Description of investment |
Mutual Funds [Member]
|
|
| Number of shares (in Shares) | shares |
190,420
|
|
| Participant directed status |
Participant-Directed Investments [Member]
|
[2] |
| Current value |
$ 1,968,946
|
|
| Minimum [Member] | Participant loans receivable [Member] |
|
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
|
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| Participant loans receivable, Interest rate |
4.25%
|
[1] |
| Maximum [Member] | Participant loans receivable [Member] |
|
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| SCHEDULE H, LINE 4i - SCHEDULE OF ASSETS (HELD AT END OF YEAR) [Abstract] |
|
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| Participant loans receivable, Interest rate |
10.00%
|
[1] |
|
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