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EMPLOYEE BENEFIT PLANS BHBK Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 18,300 | $ 16,600
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | 5,726 |
DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAssets | [1] | $ 5,927 |
Schedule of Allocation of Plan Assets [Table Text Block] |  | The fair value of major categories of the BHB Plan assets as of December 31, 2019 are summarized below:
|  |  | Fair Value Measurements at Reporting Date Using
| Fair Value |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3)
| (Dollars in thousands)
Collective funds | $ | 967 |  |  | 967 |  |  | $ | — |  |  | $ | — |
Equity securities | 1,131 |  |  | 1,131 |  |  | — |  |  | — |
Mutual funds | 3,628 |  |  | 3,628 |  |  | — |  |  | — |
Total investments in the fair value hierarchy | $ | 5,726 |  |  | $ | 5,726 |  |  | $ | — |  |  | $ | — |
Investments measured at net asset value (1) | 5,927 |  |  |  |  |  |  |
| $ | 11,653 |  |  |  |  |  |  |
(1) Under the Fair Value Measurements and Disclosure Topic of the FASB ASC, certain investments that were measured at fair value at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy. |
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | $ 5,726 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | 0 |
Defined Benefit Plan, Common Collective Trust [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 967 |
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 967 |
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Defined Benefit Plan, Common Collective Trust [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Mutual Fund [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3,628 |
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 3,628 |
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Equity Securities [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1,131 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 1,131 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 0 |
Other Pension Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 11,653 | $ 9,697
[1] | Under the Fair Value Measurements and Disclosure Topic of the FASB ASC, certain investments that were measured at fair value at net asset value per share (or its equivalent) have not been classified in the fair value hierarchy.

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