XML 61 R50.htm IDEA: XBRL DOCUMENT v3.24.1.u1

Allowance for Credit Losses and Credit Quality of Loans, Past Due Loans (Details) $ in Thousands	Mar. 31, 2024 USD ($) Relationship	Dec. 31, 2023 USD ($) Relationship
Allowance for Credit Losses and Credit Quality of Loans [Abstract]
Threshold balance for loans specifically evaluated for individual credit loss	$ 1,000
Individually evaluated loans, number of relationships | Relationship	2	2
Individually evaluated loans, amortized cost	$ 17,100	$ 17,300
Individually evaluated loans, allowance for credit losses	0	0
Loans in non-accrual without an allowance for credit losses	17,100	17,300
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	35,189	34,213
Recorded total loans	9,688,077	9,650,713
Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	32,277	30,636
31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	23,809	20,585
61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	5,868	6,390
Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,600	3,661
Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	9,620,611	9,585,864
C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,404,371	1,397,505
CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,445,546	3,433,748
Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,158,073	1,099,442
Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	896,147	917,755
Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	150,765	170,360
Commercial Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	21,822	21,567
Recorded total loans	4,849,917	4,831,253
Commercial Loans [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,454	2,086
Commercial Loans [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,640	1,217
Commercial Loans [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	814	868
Commercial Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	1
Commercial Loans [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,823,641	4,807,600
Commercial Loans [Member] | C&I [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	3,079	3,441
Recorded total loans	1,404,371	1,397,505
Commercial Loans [Member] | C&I [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,461	448
Commercial Loans [Member] | C&I [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,711	414
Commercial Loans [Member] | C&I [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	750	33
Commercial Loans [Member] | C&I [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	1
Commercial Loans [Member] | C&I [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,398,831	1,393,616
Commercial Loans [Member] | CRE [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	18,743	18,126
Recorded total loans	3,445,546	3,433,748
Commercial Loans [Member] | CRE [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,993	1,638
Commercial Loans [Member] | CRE [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,929	803
Commercial Loans [Member] | CRE [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	64	835
Commercial Loans [Member] | CRE [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	0	0
Commercial Loans [Member] | CRE [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,424,810	3,413,984
Consumer Loans [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	2,698	2,566
Recorded total loans	2,204,985	2,187,557
Consumer Loans [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	22,939	23,761
Consumer Loans [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	16,370	15,532
Consumer Loans [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,196	5,123
Consumer Loans [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,373	3,106
Consumer Loans [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,179,348	2,161,230
Consumer Loans [Member] | Auto [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	2,274	2,106
Recorded total loans	1,158,073	1,099,442
Consumer Loans [Member] | Auto [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	13,097	13,193
Consumer Loans [Member] | Auto [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	10,376	10,115
Consumer Loans [Member] | Auto [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,676	2,011
Consumer Loans [Member] | Auto [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,045	1,067
Consumer Loans [Member] | Auto [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,142,702	1,084,143
Consumer Loans [Member] | Residential Solar [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	125	245
Recorded total loans	896,147	917,755
Consumer Loans [Member] | Residential Solar [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	5,748	5,290
Consumer Loans [Member] | Residential Solar [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,940	3,074
Consumer Loans [Member] | Residential Solar [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,362	1,301
Consumer Loans [Member] | Residential Solar [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	446	915
Consumer Loans [Member] | Residential Solar [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	890,274	912,220
Consumer Loans [Member] | Other Consumer [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	299	215
Recorded total loans	150,765	170,360
Consumer Loans [Member] | Other Consumer [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,094	5,278
Consumer Loans [Member] | Other Consumer [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	2,054	2,343
Consumer Loans [Member] | Other Consumer [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	1,158	1,811
Consumer Loans [Member] | Other Consumer [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	882	1,124
Consumer Loans [Member] | Other Consumer [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	146,372	164,867
Residential [Member]
Past Due and Nonperforming Loans [Abstract]
Nonaccrual	10,669	10,080
Recorded total loans	2,633,175	2,631,903
Residential [Member] | Past Due [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	4,884	4,789
Residential [Member] | 31-60 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	3,799	3,836
Residential [Member] | 61-90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	858	399
Residential [Member] | Greater Than 90 Days Past Due Accruing [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	227	554
Residential [Member] | Current [Member]
Past Due and Nonperforming Loans [Abstract]
Recorded total loans	$ 2,617,622	$ 2,617,034

X

- Definition

The number of relationships of financing receivables that were individually evaluated for impairment.

+ References

No definition available.

+ Details

Name:	nbtb_FinancingReceivableIndividuallyEvaluatedForImpairmentNumberOfRelationships
Namespace Prefix:	nbtb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	nbtb_FinancingReceivablePastDueAndNonperformingAbstract
Namespace Prefix:	nbtb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The threshold balance for financing receivables that are specifically evaluated for individual credit loss.

+ References

No definition available.

+ Details

Name:	nbtb_FinancingReceivableThresholdBalanceForLoansSpecificallyEvaluatedForIndividualCreditLoss
Namespace Prefix:	nbtb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of valuation allowance for loans and leases receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

No definition available.

+ Details

Name:	nbtb_LoansAndLeasesReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment
Namespace Prefix:	nbtb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The balance of loans and leases receivables that were individually evaluated for impairment.

+ References

No definition available.

+ Details

Name:	nbtb_LoansAndLeasesReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix:	nbtb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost of financing receivable on nonaccrual status with no allowance for credit loss. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

+ Details

Name:	us-gaap_FinancingReceivableNonaccrualNoAllowance
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)
-Publisher SEC

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-7

+ Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-80

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 79
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-79

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3)(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (1)
-Publisher SEC

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)
-Publisher SEC

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Regulation S-K (SK)
-Number 229
-Section 1404
-Paragraph (a)
-Publisher SEC

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-14

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-SubTopic 10
-Topic 310
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-7A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

+ Details

Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_ReceivablesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=nbtb_FinancingReceivables31To60DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=nbtb_FinancingReceivables61To90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=nbtb_FinancingReceivablesGreaterThan90DaysPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_CommercialAndIndustrialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_AutoFinancingReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_ResidentialSolarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_ConsumerFinancingReceivableExcludingAutoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: