XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Fair Value Measurements and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Transfers from Level 1 to Level 2 | $ 0 | $ 0 |
Transfers from Level 2 to Level 1 | 0 | 0 |
Transfers into Level 3 | 0 | 0 |
Transfers out of Level 3 | 0 | 0 |
AFS securities [Abstract] |  |  |
AFS Securities | 1,357,614 | 1,357,614 | $ 1,338,290
Trading securities | 10,883 | 10,883 | 9,259
Liabilities [Abstract] |  |  |
Collateral dependent impaired financing receivable with specific reserves | 100 | 100 | 7,000
Allowance for loan losses for collateral dependent impaired loans with specific reserves | 30 | $ 30 | 1,500
Minimum [Member] |  |  |
Liabilities [Abstract] |  |  |
Liquidation expense ratio on impaired collateral |  | 10.00% |
Maximum [Member] |  |  |
Liabilities [Abstract] |  |  |
Liquidation expense ratio on impaired collateral |  | 35.00% |
Federal Agency [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 139,418 | $ 139,418 | 174,408
State & Municipal [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 42,919 | 42,919 | 46,726
Other Securities [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 19,739 | 19,739 | 20,739
Recurring Basis [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 1,357,614 | 1,357,614 | 1,338,290
Trading securities | 10,883 | 10,883 | 9,259
Derivatives | 6,653 | 6,653 | 3,210
Total | 1,375,150 | 1,375,150 | 1,350,759
Liabilities [Abstract] |  |  |
Derivatives | 4,128 | 4,128 | 506
Total | 4,128 | 4,128 | 506
Recurring Basis [Member] | Level 1 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 11,438 | 11,438 | 11,493
Trading securities | 10,883 | 10,883 | 9,259
Derivatives | 0 | 0 | 0
Total | 22,321 | 22,321 | 20,752
Liabilities [Abstract] |  |  |
Derivatives | 0 | 0 | 0
Total | 0 | 0 | 0
Recurring Basis [Member] | Level 2 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 1,346,176 | 1,346,176 | 1,326,797
Trading securities | 0 | 0 | 0
Derivatives | 6,653 | 6,653 | 3,210
Total | 1,352,829 | 1,352,829 | 1,330,007
Liabilities [Abstract] |  |  |
Derivatives | 4,128 | 4,128 | 506
Total | 4,128 | 4,128 | 506
Recurring Basis [Member] | Level 3 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Trading securities | 0 | 0 | 0
Derivatives | 0 | 0 | 0
Total | 0 | 0 | 0
Liabilities [Abstract] |  |  |
Derivatives | 0 | 0 | 0
Total | 0 | 0 | 0
Recurring Basis [Member] | Federal Agency [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 139,418 | 139,418 | 174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 1 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | Federal Agency [Member] | Level 2 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 139,418 | 139,418 | 174,408
Recurring Basis [Member] | Federal Agency [Member] | Level 3 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | State & Municipal [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 42,919 | 42,919 | 46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 1 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | State & Municipal [Member] | Level 2 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 42,919 | 42,919 | 46,726
Recurring Basis [Member] | State & Municipal [Member] | Level 3 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | Mortgage-Backed [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 584,226 | 584,226 | 529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 1 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 2 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 584,226 | 584,226 | 529,844
Recurring Basis [Member] | Mortgage-Backed [Member] | Level 3 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 571,312 | 571,312 | 566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 1 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 2 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 571,312 | 571,312 | 566,573
Recurring Basis [Member] | Collateralized Mortgage Obligations [Member] | Level 3 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 0 | 0 | 0
Recurring Basis [Member] | Other Securities [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 19,739 | 19,739 | 20,739
Recurring Basis [Member] | Other Securities [Member] | Level 1 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 11,438 | 11,438 | 11,493
Recurring Basis [Member] | Other Securities [Member] | Level 2 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | 8,301 | 8,301 | 9,246
Recurring Basis [Member] | Other Securities [Member] | Level 3 [Member] |  |  |
AFS securities [Abstract] |  |  |
AFS Securities | $ 0 | $ 0 | $ 0

X
- Definition Amount of allowance for loan losses for collateral dependent impaired loans with specific reserves. + References No definition available. + Details
Name: | nbtb_AllowanceForLoanLossesForCollateralDependentImpairedLoansWithSpecificReserves
Namespace Prefix: | nbtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Collateral dependent impaired loans which had specific reserves. + References No definition available. + Details
Name: | nbtb_CollateralDependentImpairedFinancingReceivableWithSpecificReserves
Namespace Prefix: | nbtb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The percentage of liquidation expenses estimated with liquidating impaired collateral. + References No definition available. + Details
Name: | nbtb_LiquidationExpenseRatioOnImpairedCollateral
Namespace Prefix: | nbtb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_AssetsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersIntoLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersOutOfLevel3
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
Name: | us-gaap_InterestRateDerivativeAssetsAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value as of the balance sheet date of interest rate derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
Name: | us-gaap_InterestRateDerivativeLiabilitiesAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
Name: | us-gaap_LiabilitiesFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
Name: | us-gaap_TradingSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |