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BORROWED FUNDS - Narrative (Details) - USD ($) |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2014 | Apr. 30, 2008 | Dec. 31, 2018 | Dec. 31, 2017 | Oct. 29, 2014
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 647,894,000 | $ 649,498,000 |
Amount |  |  | 75,902,000 | 180,223,000 |
Financial Guarantee | NHTB Capital Trust III |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debentures issued by variable interest entities | $ 20,600,000 |  |  |  |
Subordinated debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Principal amount of debt issued |  |  |  |  | $ 17,000,000.0
Fixed interest rate |  |  |  |  | 6.75%
LIBOR | Financial Guarantee |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin | 2.79% |  |  |  |
Advances from the FHLB |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  | 1,000,000 |  |
Current balance on line of credit |  |  | 0 | 0 |
Short-term debt |  |  | 611,683,000 | 608,792,000 |
Amount |  |  | 32,929,000 | 137,190,000 |
Federal Reserve Bank Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Maximum borrowing capacity on line of credit |  |  | 118,599,000 |  |
Short-term debt |  |  | 0 | 0 |
Federal Home Loan Bank Certificates and Obligations FHLB Callable Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount |  |  | 0 | 27,000,000 |
Federal Home Loan Bank Certificates and Obligations FHLB Amortizing Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount |  |  | 330,000 | 683,000 |
Subordinated borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Amount |  |  | $ 37,973,000 | $ 38,033,000 |
Maturity period (in years) |  | 15 years |  |  |
Principal amount of debt issued |  | $ 5,000,000.0 |  |  |
Earliest callable period without penalties |  | 5 years |  |  |
Effective interest rate |  |  | 6.23819% | 5.04% |
Subordinated borrowings | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin |  | 3.45% |  |  |

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- Definition The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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