XML 53 R38.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Deposits (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Deposits [Abstract] |
Maturity distribution of time deposits | The following table sets forth the maturity distribution of time deposits at December 31, 2015 (in thousands):
Time deposits |  |  |
Within one year |  | $ | 372,619 |
After one but within two years |  |  | 173,561 |
After two but within three years |  |  | 104,088 |
After three but within four years |  |  | 209,564 |
After four but within five years |  |  | 28,789 |
After five years |  |  | 20,206 |
Total |  | $ | 908,827 |

X
- Definition Sets forth the maturity distributions of time deposits (including certificates of deposits, individual retirement accounts and open accounts) held by the entity with with various term disclosure. + References No definition available. + Details
Name: | nbtb_MaturityDistributionOfTimeDepositsTableTextBlock
Namespace Prefix: | nbtb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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