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BORROWED FUNDS - Narrative (Details) - USD ($) |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 30, 2014 | Apr. 30, 2008 | Jun. 30, 2019 | Dec. 31, 2018 | Oct. 29, 2014
Debt Instrument [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 586,108,000 | $ 647,894,000 |
Advances outstanding |  |  | 189,919,000 | 75,902,000 |
Financial Guarantee | NHTB Capital Trust II and 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] |  |  |  |  |
Secured line of credit maintained |  |  | 1,000,000 |  |
Short-term line of credit outstanding |  |  | 0 | 0 |
Short-term debt |  |  | 549,168,000 | 611,683,000 |
Advances outstanding |  |  | 146,976,000 | 32,929,000 |
Federal Reserve Bank Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured line of credit maintained |  |  | 112,940,000 |  |
Short-term debt |  |  | 0 | 0 |
Federal Reserve Bank Advances | Unsecured Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Secured line of credit maintained |  |  | 50,000,000 | 50,000,000 |
Line of Credit Facility, Fair Value of Amount Outstanding |  |  | 0 | 0 |
Federal Home Loan Bank Certificates and Obligations FHLB Callable Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances outstanding |  |  | 0 | 0 |
Federal Home Loan Bank Certificates and Obligations FHLB Amortizing Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances outstanding |  |  | 330,000 | 330,000 |
Subordinated borrowings |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances outstanding |  |  | $ 37,943,000 | $ 37,973,000 |
Maturity period |  | 15 years |  |  |
Principal amount of debt issued |  | $ 5,000,000.0 |  |  |
Earliest callable period without penalties |  | 5 years |  |  |
Effective interest rate |  |  | 5.86% | 6.24% |
Subordinated borrowings | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest rate margin |  | 3.45% |  |  |

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