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BUSINESS COMBINATIONS - Monument Bancorp (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2019 USD ($) Office shares | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
BUSINESS COMBINATIONS |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 52,505,000 |  |  |  | $ 28,388,000 |  |  |  | $ 52,505,000 | $ 28,388,000 | $ 11,942,000
Loss on prepayment of borrowings |  | 1,636,000 | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |
Net gains on available-for-sale debt securities |  | 144,000 | 25,000 | 0 | 0 | 3,000 | $ 13,000 | $ 7,000 | $ 0 | 169,000 | 23,000 |
Merger-related expenses |  | $ 182,000 | $ 6,402,000 | $ 983,000 | $ 141,000 | $ 281,000 | $ 206,000 | $ 3,301,000 | $ 311,000 | $ 7,708,000 | 4,099,000 |
Monument Bancorp, Inc |  |  |  |  |  |  |  |  |  |  |  |
BUSINESS COMBINATIONS |  |  |  |  |  |  |  |  |  |  |  |
Common stock acquired (as a percent) | 100.00% |  |  |  |  |  |  |  |  |  |  |
Number of bank offices | Office | 2 |  |  |  |  |  |  |  |  |  |  |
Number of lending office | Office | 1 |  |  |  |  |  |  |  |  |  |  |
Total purchase consideration | $ 42,700,000 |  |  |  |  |  |  |  |  |  |  |
Cash paid | $ 9,600,000 |  |  |  |  |  |  |  |  |  |  |
Consideration in shares of commons stock (in shares) | shares | 1,279,825 |  |  |  |  |  |  |  |  |  |  |
Common equity issued in business combination | $ 33,100,000 |  |  |  |  |  |  |  |  |  |  |
Equity portion of business acquisition consideration issuance costs | 181,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill | 16,400,000 |  |  |  |  |  |  |  |  |  |  |
Core deposit intangible asset | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Loans | 259,300,000 |  |  |  |  |  |  |  |  |  |  |
Deposits | 223,300,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings | 111,600,000 |  |  |  |  |  |  |  |  |  |  |
Subordinated debt | 12,400,000 |  |  |  |  |  |  |  |  |  |  |
Available-for-sale debt securities | 94,600,000 |  |  |  |  |  |  |  |  |  |  |
Net gains on available-for-sale debt securities | $ 0 |  |  |  |  |  |  |  |  |  |  |
Refinement term of assets and liabilities | 1 year |  |  |  |  |  |  |  |  |  |  |
Merger-related expenses |  |  |  |  |  |  |  |  |  |  | $ 3,812,000 |
Monument Bancorp, Inc | Subordinated debt, Redeemed April 1, 2019 |  |  |  |  |  |  |  |  |  |  |  |
BUSINESS COMBINATIONS |  |  |  |  |  |  |  |  |  |  |  |
Subordinated debt | $ 5,400,000 |  |  |  |  |  |  |  |  |  |  |
Loss on prepayment of borrowings | $ 0 |  |  |  |  |  |  |  |  |  |  |

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