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EMPLOYEE BENEFIT PLANS BHBK Schedule of Allocation of Plan Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | $ 20,300 | $ 19,100 |
Schedule of Allocation of Plan Assets [Table Text Block] |  | The fair value of major categories of the BHB Plan assets 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)
| December 31, 2021
| (Dollars in thousands)
Collective funds | $ | 1,542 |  |  | 1,542 |  |  | $ | — |  |  | $ | — |
Equity securities | 3,391 |  |  | 3,391 |  |  | — |  |  | — |
Mutual funds | 1,702 |  |  | 1,702 |  |  | — |  |  | — |
Total investments in the fair value hierarchy | $ | 6,635 |  |  | $ | 6,635 |  |  | $ | — |  |  | $ | — |
Investments measured at net asset value (1) | 7,464 |  |  |  |  |  |  |
| $ | 14,099 |  |  |  |  |  |  |
|  |  | 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)
| December 31, 2020
| (Dollars in thousands)
Collective funds | $ | 1,300 |  |  | 1,300 |  |  | $ | — |  |  | $ | — |
Equity securities | 3,239 |  |  | 3,239 |  |  | — |  |  | — |
Mutual funds | 1,506 |  |  | 1,506 |  |  | — |  |  | — |
Total investments in the fair value hierarchy | $ | 6,045 |  |  | $ | 6,045 |  |  | $ | — |  |  | $ | — |
Investments measured at net asset value (1) | 6,180 |  |  |  |  |  |  |
| $ | 12,225 |  |  |  |  |  |  |
(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 |  | $ 6,635 | 6,045 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | 0 | 0 |
Defined Benefit Plan, Common Collective Trust [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 1,542 | 1,300 |
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, Investment within Plan Asset Category, Amount |  | 1,542 | 1,300 |
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, Investment within Plan Asset Category, Amount |  | 0 | 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, Investment within Plan Asset Category, Amount |  | 0 | 0 |
Mutual Fund [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 1,702 | 1,506 |
Mutual Fund [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 1,702 | 1,506 |
Mutual Fund [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 0 | 0 |
Mutual Fund [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 0 | 0 |
Equity Securities [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 3,391 | 3,239 |
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 3,391 | 3,239 |
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 0 | 0 |
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Investment within Plan Asset Category, Amount |  | 0 | 0 |
Other Pension Plan [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Category [Line Items] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount |  | 14,099 | 12,225 | $ 11,653
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments |  | 6,635 | 6,045 |
DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAssets | [1] | $ 7,464 | $ 6,180 |
[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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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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