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EMPLOYEE BENEFIT PLANS BHBK Schedule of Allocation of Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Category [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 19,100 $ 18,300  
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 ValueQuoted 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 securities3,239 3,239 — — 
Mutual funds1,506 1,506 — — 
Total investments in the fair value hierarchy$6,045 $6,045 $— $— 
Investments measured at net asset value (1)6,180 
$12,225 
Fair Value Measurements at Reporting Date Using
Fair ValueQuoted Prices in Active Markets for Identical Assets (Level 1)Significant Other Observable Inputs (Level 2)Significant Unobservable Inputs
(Level 3)
December 31, 2019
(Dollars in thousands)
Collective funds$967 967 $— $— 
Equity securities1,131 1,131 — — 
Mutual funds3,628 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 $ 6,045 5,726  
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 1,300 967  
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, Investment within Plan Asset Category, Amount 1,300 967  
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, 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 1,506 3,628  
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 1,506 3,628  
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 3,239 1,131  
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 3,239 1,131  
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 12,225 11,653 $ 9,697
DefinedBenefitPlanFairValueofPlanAssetsExcludingNetAssetValueInvestments 6,045 5,726  
DefinedBenefitPlanAlternativeInvestmentsFairValueOfPlanAssets [1] $ 6,180 $ 5,927  
[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.