XML 77 R50.htm IDEA: XBRL DOCUMENT
v3.19.3

Allowance for Loan Losses and Credit Quality of Loans, Average Recorded Investments on Loans Specifically Evaluated for Impairment and Interest Income Recognized (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | $ 18,806 | $ 19,528 | $ 20,126 | $ 20,305
Interest income recognized | 228 | 210 | 662 | 646
Originated Loans [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 18,806 | 19,528 | 20,126 | 20,305
Interest income recognized | 228 | 210 | 662 | 646
Originated Loans [Member] | Commercial Loans [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 3,671 | 5,102 | 4,979 | 5,446
Interest income recognized | 37 | 36 | 110 | 109
Originated Loans [Member] | Commercial Loans [Member] | C&I [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 115 | 433 | 291 | 449
Interest income recognized | 0 | 0 | 1 | 1
Originated Loans [Member] | Commercial Loans [Member] | CRE [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 2,554 | 3,645 | 3,577 | 3,999
Interest income recognized | 30 | 32 | 91 | 96
Originated Loans [Member] | Commercial Loans [Member] | Business Banking [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 1,002 | 1,024 | 1,111 | 998
Interest income recognized | 7 | 4 | 18 | 12
Originated Loans [Member] | Consumer Loans [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 7,506 | 7,907 | 7,719 | 8,140
Interest income recognized | 98 | 106 | 300 | 325
Originated Loans [Member] | Consumer Loans [Member] | Dealer Finance [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 213 | 177 | 201 | 187
Interest income recognized | 3 | 4 | 9 | 8
Originated Loans [Member] | Consumer Loans [Member] | Direct [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 7,293 | 7,730 | 7,518 | 7,953
Interest income recognized | 95 | 102 | 291 | 317
Originated Loans [Member] | Residential Real Estate [Member] |  |  |  |
Average Recorded Investment and Interest Income Recognized [Abstract] |  |  |  |
Average recorded investment | 7,629 | 6,519 | 7,428 | 6,719
Interest income recognized | $ 93 | $ 68 | $ 252 | $ 212

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

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeAccrualMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=nbtb_OriginatedLoansMember
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_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_SmallBusinessFinancingReceivableMember
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_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_DealerFinanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=nbtb_DirectFinancingReceivableMember
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: |