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LOANS - Additional information (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) loan borrower | Mar. 27, 2020 USD ($) | Jun. 30, 2020 USD ($) loan borrower | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) loan borrower | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) | Mar. 31, 2020 USD ($) | Apr. 01, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total | $ 5,519,000 |  | $ 5,519,000 |  | $ 5,519,000 |  | $ 2,482,000 |  |  |  |
Recorded investment - with allowance | 12,189,000 |  | 12,189,000 |  | 12,189,000 |  | 3,375,000 |  |  |  |
Specific allowances | 1,956,000 |  | 1,956,000 |  | 1,956,000 |  | 1,051,000 |  |  |  |
(Credit) provision for loan losses |  |  | (176,000) | $ (4,000) | 1,352,000 | $ (961,000) |  |  |  |  |
Increase in expenses |  |  |  |  | 2,313,000 |  |  |  |  |  |
Allowance for Loan losses | 11,026,000 |  | 11,026,000 | 8,200,000 | $ 11,026,000 | 8,200,000 | 9,836,000 | $ 11,330,000 |  | $ 8,256,000 | $ 9,309,000
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  | 100,000 |  |  |  |  |  |
Net deferred origination fees | $ 5,519,000 |  | 5,519,000 |  | $ 5,519,000 |  | 2,482,000 |  |  |  |
Number of loans granted deferrals | loan | 706 |  |  |  |  |  |  |  |  |  |
Aggregate recorded investment of deferral payments | $ 202,000,000 |  |  |  |  |  |  |  |  |  |
Financing receivable charge-offs |  |  | 146,000 | 68,000 | 194,000 | 179,000 |  |  |  |  |
Recorded Investment | 14,280,000 |  | 14,280,000 |  | 14,280,000 |  | 5,486,000 |  |  |  |
Financial Assets Facing Additional Credit Deterioration Due to Economic Impact of Covid-19 |  |  |  |  |  |  |  |  |  |  |
(Credit) provision for loan losses |  |  | 244,000 |  | 646,000 |  |  |  |  |  |
Commercial |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses | 5,858,000 |  | 5,858,000 | 3,388,000 | 5,858,000 | 3,388,000 | 4,788,000 | 6,089,000 |  | 3,444,000 | 4,591,000
Financing receivable charge-offs |  |  | 107,000 | 6,000 | 124,000 | 6,000 |  |  |  |  |
Commercial | Maximum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 200,000 |  | 200,000 |  | 200,000 |  |  |  |  |  |
Commercial | Minimum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 200,000 |  | 200,000 |  | 200,000 |  |  |  |  |  |
Specific Loans Portfolio Segment |  |  |  |  |  |  |  |  |  |  |
(Credit) provision for loan losses |  |  |  |  | 1,067,000 |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Period Increase (Decrease), Total |  |  |  |  | 905,000 |  |  |  |  |  |
Financing receivable charge-offs |  |  |  |  | 162,000 |  |  |  |  |  |
Unallocated |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses | 585,000 |  | 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 |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses | 4,320,000 |  | 4,320,000 | 3,963,000 | 4,320,000 | 3,963,000 | 4,182,000 | 4,383,000 |  | 3,991,000 | 3,986,000
Financing receivable charge-offs |  |  | 0 | 33,000 | 0 | 107,000 |  |  |  |  |
Residential mortgage | Maximum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 400,000 |  | 400,000 |  | 400,000 |  |  |  |  |  |
Residential mortgage | Minimum |  |  |  |  |  |  |  |  |  |  |
Financing Receivable Individually Evaluated for Impairment Threshold With Estimated Loss | 400,000 |  | 400,000 |  | 400,000 |  |  |  |  |  |
One Real Estate Secured Commercial Loan | Commercial |  |  |  |  |  |  |  |  |  |  |
Specific allowances | 1,193,000 |  | 1,193,000 |  | 1,193,000 |  |  |  |  |  |
Small Business Administration - Paycheck Protection Program |  |  |  |  |  |  |  |  |  |  |
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums, Total | 3,017,000 |  | 3,017,000 |  | 3,017,000 |  |  |  |  |  |
Amount of stimulus package designed |  | $ 2,000,000,000,000 |  |  |  |  |  |  |  |  |
(Credit) provision for loan losses |  |  |  |  | 0 |  |  |  |  |  |
Contractual principal balances | 100,120,000 |  | 100,120,000 |  | 100,120,000 |  |  |  |  |  |
Net deferred origination fees | 3,017,000 |  | 3,017,000 |  | 3,017,000 |  |  |  |  |  |
Accretion of fees received | 337,000 |  | 337,000 |  | 337,000 |  |  |  |  |  |
Recorded Investment | 97,103,000 |  | 97,103,000 |  | 97,103,000 |  |  |  |  |  |
Small Business Administration - Paycheck Protection Program | Commercial |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses | 0 |  | 0 |  | 0 |  |  |  |  |  |
Construction Loans | Commercial |  |  |  |  |  |  |  |  |  |  |
Recorded investment - with allowance | 0 |  | 0 |  | 0 |  | 1,261,000 |  |  |  |
Specific allowances | 0 |  | 0 |  | 0 |  | 678,000 | 674,000 |  |  |
Allowance for Loan losses | 420,000 |  | 420,000 | 152,000 | 420,000 | 152,000 | 966,000 | 970,000 |  | 114,000 | 110,000
Financing receivable charge-offs |  |  | 107,000 | 0 | 107,000 | 0 |  |  |  |  |
Construction Loans | Residential mortgage |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses | 137,000 |  | 137,000 | 220,000 | 137,000 | 220,000 | 117,000 | 119,000 |  | 198,000 | 203,000
Financing receivable charge-offs |  |  | 0 | 0 | 0 | 0 |  |  |  |  |
Real estate loan | Commercial |  |  |  |  |  |  |  |  |  |  |
Recorded investment - with allowance | 6,754,000 |  | 6,754,000 |  | 6,754,000 |  | 0 |  |  |  |
Specific allowances | 494,000 |  | 494,000 |  | 494,000 |  | 0 |  |  |  |
Allowance for Loan losses | 2,426,000 |  | 2,426,000 | 1,577,000 | 2,426,000 | 1,577,000 | 1,921,000 | $ 1,932,000 |  | $ 1,887,000 | $ 2,538,000
Financing receivable charge-offs |  |  | 0 | $ 0 | 0 | $ 0 |  |  |  |  |
Real estate loan | Residential mortgage |  |  |  |  |  |  |  |  |  |  |
Specific allowances | 154,000 |  | 154,000 |  | $ 154,000 |  | $ 176,000 |  |  |  |
Loans Receivable 1 | Credit Availability Concentration Risk |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 10.00% |  | 10.00% |  |  |  |
Purchased Credit Impaired |  |  |  |  |  |  |  |  |  |  |
Allowance for Loan losses | 305,000 |  | 305,000 |  | $ 305,000 |  | $ 441,000 |  |  |  |
Changes to Experience Factors Used to Estimate Allowance |  |  |  |  |  |  |  |  |  |  |
(Credit) provision for loan losses |  |  |  |  | (89,000) |  |  |  |  |  |
Impact of Reduction in Loans [Member] |  |  |  |  |  |  |  |  |  |  |
(Credit) provision for loan losses |  |  |  |  | (272,000) |  |  |  |  |  |
Monument Bancorp, Inc |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable |  |  |  |  |  |  |  |  | $ 259,295,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable, Market Rate Adjustment |  |  |  |  |  |  |  |  | 1,807,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Fair Value Adjustment on Non-credit Impaired Loans |  |  |  |  |  |  |  |  | 1,914,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Fair Value Adjustment on Impaired Loans |  |  |  |  |  |  |  |  | 318,000 |  |
Monument Bancorp, Inc | Purchased Credit Impaired |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable |  |  |  |  |  |  |  |  | $ 441,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Credit Fair Value Adjustment on Non-credit Impaired Loans | $ 1,914,000 |  | $ 1,914,000 |  | 1,914,000 |  |  |  |  |  |
Interest and Fee Income, Loans and Leases, Total |  |  |  |  | 113,000 |  |  |  |  |  |
Allowance for Loan and Lease Losses, Loans Acquired |  |  |  |  | $ 878,000 |  | $ 1,216,000 |  |  |  |
Number of loans purchased that were impaired | borrower | 2 |  | 2 |  | 2 |  |  |  |  |  |
Number of borrowers whose loans were impaired | loan | 5 |  | 5 |  | 5 |  |  |  |  |  |
Recorded investment - with allowance | $ 6,075,000 |  | $ 6,075,000 |  | $ 6,075,000 |  |  |  |  |  |
Specific allowances | $ 350,000 |  | $ 350,000 |  | $ 350,000 |  |  |  |  |  |

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