XML 56 R41.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Summary of Significant Accounting Policies (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Summary of Significant Accounting Policies [Abstract] |
Portfolio and Class Segments | The following table illustrates the portfolio and class segments for the Company’s loan portfolio:
Portfolio Segment | Class
Commercial Loans | Commercial & Industrial Commercial Real Estate
Consumer Loans | Auto Residential Solar Other Consumer
Residential Loans
Noninterest Income, Segregated by Revenue Streams in-Scope and Out-of-Scope of ASC 606 | The following table presents noninterest income, segregated by revenue streams in-scope and out-of-scope of ASC 606:
|  | Years Ended December 31, |
(In thousands) |  | 2024 |  |  | 2023 |  |  | 2022 |
Noninterest income |  |  |  |  |  |  |  |  |
In-Scope of ASC 606: |  |  |  |  |  |  |  |  |
Service charges on deposit accounts |  | $ | 17,087 |  |  | $ | 15,425 |  |  | $ | 14,630 |
Card services income |  |  | 22,331 |  |  |  | 20,829 |  |  |  | 29,058 |
Retirement plan administration fees |  |  | 56,587 |  |  |  | 47,221 |  |  |  | 48,112 |
Wealth management |  |  | 41,641 |  |  |  | 34,763 |  |  |  | 33,311 |
Insurance services |  |  | 17,032 |  |  |  | 15,667 |  |  |  | 14,696 |
Other |  |  | 11,032 |  |  |  | 10,838 |  |  |  | 10,858 |
Total noninterest income in-scope of ASC 606 |  | $ | 165,710 |  |  | $ | 144,743 |  |  | $ | 150,665 |
Total noninterest income out-of-scope of ASC 606 |  | $ | 11,114 |  |  | $ | (2,565 | ) |  | $ | 4,913 |
Total noninterest income |  | $ | 176,824 |  |  | $ | 142,178 |  |  | $ | 155,578 |

X
- Definition Tabular disclosure of the portfolio and class segments of the entity's loan portfolio. + References No definition available. + Details
Name: | nbtb_PortfolioAndClassSegmentsTableTextBlock
Namespace Prefix: | nbtb_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-5 + Details
Name: | us-gaap_DisaggregationOfRevenueTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration