XML 52 R36.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Loans [Abstract] |
Loans, net of deferred fees and origination costs | A summary of loans, net of deferred fees and origination costs, by category is as follows:
|  | At December 31, |
(In thousands) |  | 2017 |  |  | 2016 |
Residential real estate mortgages |  | $ | 1,321,695 |  |  | $ | 1,262,614 |
Commercial |  |  | 1,317,174 |  |  |  | 1,242,701 |
Commercial real estate |  |  | 1,711,095 |  |  |  | 1,543,301 |
Consumer |  |  | 1,740,038 |  |  |  | 1,641,657 |
Home equity |  |  | 494,771 |  |  |  | 507,784 |
Total loans |  | $ | 6,584,773 |  |  | $ | 6,198,057 |
Related party loans | In the ordinary course of business, the Company has made loans at prevailing rates and terms to directors, officers and other related parties. Such loans, in management’s opinion, do not present more than the normal risk of collectability or incorporate other unfavorable features. The aggregate amount of loans outstanding to qualifying related parties and changes during the years are summarized as follows:
(In thousands) |  | 2017 |  |  | 2016 |
Balance at January 1, |  | $ | 2,050 |  |  | $ | 2,346 |
New loans |  |  | 297 |  |  |  | 936 |
Adjustment due to change in composition of related parties |  |  | 198 |  |  |  | (406 | )
Repayments |  |  | (968 | ) |  |  | (826 | )
Balance at December 31, |  | $ | 1,577 |  |  | $ | 2,050 |

X
- Definition A tabular disclosure of related party transactions. Disclosure may include: the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, revenues and expenses from related party transactions and amounts due to or from related parties. + References No definition available. + Details
Name: | nbtb_ScheduleOfRelatedPartyTransactionsByRelatedPartyTableTableTextBlock
Namespace Prefix: | nbtb_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration