XML 27 R16.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Reclassification Adjustments Out of Other Comprehensive Income | 6 Months Ended
--- | ---
Jun. 30, 2017
Reclassification Adjustments Out of Other Comprehensive Income [Abstract] |
Reclassification Adjustments Out of Other Comprehensive Income |
7. | Reclassification Adjustments Out of Other Comprehensive Income
The following table summarizes the reclassification adjustments out of accumulated other comprehensive income:
Detail About Accumulated Other Comprehensive Income Components |  | Amount Reclassified From Accumulated Other Comprehensive Income |  | Affected Line Item in the Consolidated Statement of Comprehensive Income
(In thousands) |  | Three months ended |  |
|  | June 30, 2017 |  |  | June 30, 2016 |  |
AFS Securities: |  |  |  |  |  |  |
Gains on AFS securities |  | $ | (2 | ) |  | $ | (1 | ) | Net securities gains
Amortization of unrealized gains related to securities transfer |  |  | 225 |  |  |  | 280 |  | Interest income
Income tax (expense) |  |  | (85 | ) |  |  | (108 | ) | Income tax (expense)
Net of tax |  | $ | 138 |  |  | $ | 171 |  |
Pension and other benefits: |  |  |  |  |  |  |  |  |
Amortization of net losses |  | $ | 435 |  |  | $ | 515 |  | Salaries and employee benefits
Amortization of prior service costs |  |  | - |  |  |  | (3 | ) | Salaries and employee benefits
Income tax (expense) |  |  | (166 | ) |  |  | (199 | ) | Income tax (expense)
Net of tax |  | $ | 269 |  |  | $ | 313 |  |
Total reclassifications during the period, net of tax |  | $ | 407 |  |  | $ | 484 |  |
Detail About Accumulated Other Comprehensive Income Components |  | Amount Reclassified From Accumulated Other Comprehensive Income |  | Affected Line Item in the Consolidated Statement of Comprehensive Income
|  | Six months ended |  |
|  | June 30, 2017 |  |  | June 30, 2016 |  |
AFS Securities: |  |  |  |  |  |  |
Gains on AFS securities |  | $ | (2 | ) |  | $ | (30 | ) | Net securities gains
Amortization of unrealized gains related to securities transfer |  |  | 463 |  |  |  | 576 |  | Interest income
Impairment write-down of equity security |  |  | 1,312 |  |  |  | - |  | Other noninterest income
Income tax (expense) |  |  | (176 | ) |  |  | (213 | ) | Income tax (expense)
Net of tax |  | $ | 1,597 |  |  | $ | 333 |  |
Pension and other benefits: |  |  |  |  |  |  |  |  |
Amortization of net losses |  | $ | 870 |  |  | $ | 1,030 |  | Salaries and employee benefits
Amortization of prior service costs |  |  | - |  |  |  | (6 | ) | Salaries and employee benefits
Income tax (expense) |  |  | (332 | ) |  |  | (398 | ) | Income tax (expense)
Net of tax |  | $ | 538 |  |  | $ | 626 |  |
Total reclassifications during the period, net of tax |  | $ | 2,135 |  |  | $ | 959 |  |

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

X
- Definition The entire disclosure for reclassification from accumulated other comprehensive income. + References No definition available. + Details
Name: | nbtb_ReclassificationAdjustmentsOutOfOtherComprehensiveIncomeLossTextBlock
Namespace Prefix: | nbtb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration