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LOANS - Additional information (Details) |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 27, 2020 USD ($) | Sep. 30, 2020 USD ($) item | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) item | Sep. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Apr. 01, 2019 USD ($) | Dec. 31, 2018 USD ($)
LOANS |  |  |  |  |  |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total |  | $ 7,620,000 |  |  | $ 7,620,000 |  | $ 2,482,000 |  |  |  |
Recorded investment - with allowance |  | 8,085,000 |  |  | 8,085,000 |  | 3,375,000 |  |  |  |
Specific allowances |  | 651,000 |  |  | 651,000 |  | 1,051,000 |  |  |  |
Provision for loan losses |  | 1,941,000 |  | $ 1,158,000 | 3,293,000 | $ 197,000 |  |  |  |  |
Loans receivable |  | $ 1,691,370,000 |  |  | 1,691,370,000 |  | 1,182,222,000 |  |  |  |
Increase in expenses |  |  |  |  | $ 3,096,000 |  |  |  |  |  |
Minimum extension period to determine if loan is impaired | item |  | 1 |  |  | 1 |  |  |  |  |  |
Allowance for Loan losses |  | $ 10,753,000 |  | 9,257,000 | $ 10,753,000 | 9,257,000 | 9,836,000 | $ 11,026,000 | $ 8,200,000 |  | $ 9,309,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  | 100,000 |  |  |  |  |  |
Financing receivable charge-offs |  | 2,249,000 |  | 116,000 | $ 2,443,000 | 295,000 |  |  |  |  |
Recorded Investment |  | 18,612,000 |  |  | 18,612,000 |  | 5,486,000 |  |  |  |
Financial Assets Facing Additional Credit Deterioration Due to Economic Impact of Covid-19 |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  | 79,000 |  |  | 725,000 |  |  |  |  |  |
TDRs for which payment defaults occurred |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Financing receivable charge-offs |  | 2,214,000 |  |  |  |  |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 1,035,071,000 |  |  | $ 1,035,071,000 |  | 578,901,000 |  |  |  |
Charge-off rate period considered in evaluating loss exposure |  |  |  |  | 5 years |  |  |  |  |  |
Allowance for Loan losses |  | 5,629,000 |  | 4,344,000 | $ 5,629,000 | 4,344,000 | 4,788,000 | 5,858,000 | 3,388,000 |  | 4,591,000
Financing receivable charge-offs |  | 2,219,000 |  | 0 | 2,343,000 | 6,000 |  |  |  |  |
Commercial | Maximum |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss |  | 200,000 |  |  | 200,000 |  |  |  |  |  |
Commercial | Minimum |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss |  | 200,000 |  |  | 200,000 |  |  |  |  |  |
Commercial loan of $3,500,000 |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 3,500,000 |  |  | 3,500,000 |  |  |  |  |  |
Specific Loans Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Specific allowances |  | 1,305,000 |  |  | 1,305,000 |  |  |  |  |  |
Provision for loan losses |  | 909,000 |  |  | 1,976,000 |  |  |  |  |  |
Unallocated |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses |  | 585,000 |  | 585,000 | 585,000 | 585,000 | 585,000 | 585,000 | 585,000 |  | 499,000
Financing receivable charge-offs |  | 0 |  | 0 | 0 | 0 |  |  |  |  |
Residential mortgage |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 639,023,000 |  |  | $ 639,023,000 |  | 586,580,000 |  |  |  |
Charge-off rate period considered in evaluating loss exposure |  |  |  |  | 3 years |  |  |  |  |  |
Allowance for Loan losses |  | 4,281,000 |  | 4,054,000 | $ 4,281,000 | 4,054,000 | 4,182,000 | 4,320,000 | 3,963,000 |  | 3,986,000
Financing receivable charge-offs |  | 0 |  | 50,000 | 0 | 157,000 |  |  |  |  |
Residential mortgage | Maximum |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss |  | 400,000 |  |  | 400,000 |  |  |  |  |  |
Residential mortgage | Minimum |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss |  | 400,000 |  |  | 400,000 |  |  |  |  |  |
One Real Estate Secured Commercial Loan |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Specific allowances |  |  |  | 678,000 |  | 678,000 |  |  |  |  |
Small Business Administration - Paycheck Protection Program |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total |  | 4,402,000 |  |  | 4,402,000 |  |  |  |  |  |
Amount of stimulus package designed | $ 2,000,000,000,000 |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  | 0 |  |  |  |  |  |
Contractual principal balances |  | 166,690,000 |  |  | 166,690,000 |  |  |  |  |  |
Accretion of fees received |  | 467,000 |  |  | 804,000 |  |  |  |  |  |
Recorded Investment |  | 163,050,000 |  |  | 163,050,000 |  |  |  |  |  |
Small Business Administration - Paycheck Protection Program | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 163,050,000 |  |  | 163,050,000 |  | 0 |  |  |  |
Allowance for Loan losses |  | 0 |  |  | 0 |  |  |  |  |  |
Construction Loans | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Recorded investment - with allowance |  | 0 |  |  | 0 |  | 1,261,000 |  |  |  |
Specific allowances |  | 0 |  |  | 0 |  | 678,000 |  |  |  |
Loans receivable |  | 41,906,000 |  |  | 41,906,000 |  | 33,555,000 |  |  |  |
Allowance for Loan losses |  | 440,000 |  | 158,000 | 440,000 | 158,000 | 966,000 | 420,000 | 152,000 |  | 110,000
Financing receivable charge-offs |  | 0 |  | 0 | 107,000 | 0 |  |  |  |  |
Construction Loans | Residential mortgage |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 29,146,000 |  |  | 29,146,000 |  | 14,798,000 |  |  |  |
Allowance for Loan losses |  | 169,000 |  | 258,000 | 169,000 | 258,000 | 117,000 | 137,000 | 220,000 |  | 203,000
Financing receivable charge-offs |  | 0 |  | 0 | 0 | 0 |  |  |  |  |
Real estate loan | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Recorded investment - with allowance |  | 6,497,000 |  |  | 6,497,000 |  | 0 |  |  |  |
Specific allowances |  | 409,000 |  | 678,000 | 409,000 | 678,000 | 0 | 1,193,000 |  |  |
Provision for loan losses |  |  | $ 107,000 |  | 2,376,000 |  |  |  |  |  |
Loans receivable |  | 530,874,000 |  |  | 530,874,000 |  | 301,227,000 |  |  |  |
Allowance for Loan losses |  | $ 2,386,000 |  | 2,505,000 | 2,386,000 | 2,505,000 | 1,921,000 | $ 2,426,000 | $ 1,577,000 |  | $ 2,538,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 1 |  |  |  |  |  |  |  |  |
Financing receivable charge-offs |  | $ 0 |  | 0 | 0 | 0 |  |  |  |  |
Real estate loan | Commercial | Troubled Debt Restructuring |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Specific allowances |  | 134,000 |  |  | 134,000 |  |  |  |  |  |
Real estate loan | Commercial | TDRs for which payment defaults occurred |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Specific allowances |  |  |  | 0 |  | 0 |  |  |  |  |
Real estate loan | Commercial loan of $3,500,000 |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Financing receivable charge-offs |  | 2,219,000 |  |  | 2,219,000 |  |  |  |  |  |
Real estate loan | Specific Loans Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Net decrease in allowance |  |  |  |  | 400,000 |  |  |  |  |  |
Real estate loan | Residential mortgage |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Specific allowances |  | 161,000 |  |  | $ 161,000 |  | $ 176,000 |  |  |  |
Loans Receivable 1 | Credit Availability Concentration Risk |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 10.00% |  | 10.00% |  |  |  |
Purchased Credit Impaired |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 7,447,000 |  |  | $ 7,447,000 |  | $ 441,000 |  |  |  |
Purchased Credit Impaired | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 7,298,000 |  |  | 7,298,000 |  | 364,000 |  |  |  |
Purchased Credit Impaired | Residential mortgage |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 149,000 |  |  | 149,000 |  | 77,000 |  |  |  |
Purchased Credit Impaired | Small Business Administration - Paycheck Protection Program | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 0 |  |  | 0 |  |  |  |  |  |
Purchased Credit Impaired | Construction Loans | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 0 |  |  | 0 |  | 0 |  |  |  |
Purchased Credit Impaired | Construction Loans | Residential mortgage |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 0 |  |  | 0 |  | 0 |  |  |  |
Purchased Credit Impaired | Real estate loan | Commercial |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Loans receivable |  | 4,342,000 |  |  | 4,342,000 |  | 364,000 |  |  |  |
Changes to Experience Factors Used to Estimate Allowance |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  | 834,000 |  |  | 745,000 | 347,000 |  |  |  |  |
Impact of Reduction in Loans |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  |  |  |  | 153,000 |  |  |  |  |  |
Impact of loan growth |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Provision for loan losses |  | 119,000 |  | 373,000 |  |  |  |  |  |  |
Market Rate Adjustment |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Adjustment recorded in acquisition |  | 2,909,000 |  | $ 0 | 2,909,000 | $ (1,807,000) |  |  |  |  |
Market Rate Adjustment | Small Business Administration - Paycheck Protection Program |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Adjustment recorded in acquisition |  |  |  |  | 762,000 |  |  |  |  |  |
Monument Bancorp, Inc |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable |  |  |  |  |  |  |  |  |  | $ 259,300,000 |
Monument Bancorp, Inc | Purchased Credit Impaired |  |  |  |  |  |  |  |  |  |  |
LOANS |  |  |  |  |  |  |  |  |  |  |
Interest and Fee Income, Loans and Leases, Total |  | $ 7,000 |  |  | 120,000 |  |  |  |  |  |
Allowance for Loan and Lease Losses, Loans Acquired |  |  |  |  | $ 7,127,000 |  | $ 1,216,000 |  |  |  |

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- Definition The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121604886&loc=d3e8622-111531 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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