XML 62 R52.htm IDEA: XBRL DOCUMENT
v3.23.2

Allowance for Credit Losses and Credit Quality of Loans, Troubled Debt Restructuring (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 USD ($) Contract | Jun. 30, 2022 USD ($) Contract
Recorded Investment and Number of Modifications Designated as TDRs [Abstract] |  |
Number of contracts | Contract | 2 | 4
Pre-modification outstanding recorded investment | $ 98 | $ 216
Post-modification outstanding recorded investment | $ 123 | $ 247
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract] |  |
Number of contracts | Contract | 18 | 35
Recorded investment | $ 890 | $ 1,725
Consumer Loans [Member] |  |
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract] |  |
Number of contracts | Contract | 0 | 1
Recorded investment | $ 0 | $ 11
Consumer Loans [Member] | Auto [Member] |  |
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract] |  |
Number of contracts | Contract | 0 | 1
Recorded investment | $ 0 | $ 11
Residential [Member] |  |
Recorded Investment and Number of Modifications Designated as TDRs [Abstract] |  |
Number of contracts | Contract | 2 | 4
Pre-modification outstanding recorded investment | $ 98 | $ 216
Post-modification outstanding recorded investment | $ 123 | $ 247
Recorded Investment and Number of Modifications for TDRs Where a Concession Has Been Made and Subsequently Defaulted [Abstract] |  |
Number of contracts | Contract | 18 | 34
Recorded investment | $ 890 | $ 1,714

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable. + References No definition available. + Details
Name: | nbtb_FinancingReceivableModificationsPostModificationRecordedInvestment1
Namespace Prefix: | nbtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 33 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-33 + Details
Name: | us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 44 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-44 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 34 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-34 + Details
Name: | us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
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_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |