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BUSINESS COMBINATIONS - Monument Bancorp (Details) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 USD ($) Office shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
BUSINESS COMBINATIONS |  |  |  |  |  |  |  |  |
Goodwill |  | $ 52,526,000 | $ 28,618,000 | $ 52,526,000 | $ 28,618,000 | $ 28,388,000 | $ 28,388,000 | $ 28,618,000 | $ 11,942,000
Realized gains on available-for-sale debt securities, net |  | 25,000 | 13,000 | 25,000 | 20,000 |  |  |  |
Business Combination, Acquisition Related Costs |  | $ 6,402,000 | 206,000 | $ 7,526,000 | 3,818,000 |  |  |  |
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 |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Cash, Net of Stock Issuance Costs | $ 9,600,000 |  |  |  |  |  |  |  |
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares | 1,279,825 |  |  |  |  |  |  |  |
Common stock issued | $ 33,100,000 |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interest Issuance Costs | 181,000 |  |  |  |  |  |  |  |
Goodwill | 16,400,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans Receivable | 259,300,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deposits | 223,300,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Short-term Borrowing | 111,600,000 |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debt | 12,400,000 |  |  |  |  |  |  |  |
Available-for-sale debt securities | 94,600,000 |  |  |  |  |  |  |  |
Realized gains on available-for-sale debt securities, net | $ 0 |  |  |  |  |  |  |  |
Refinement term of assets and liabilities | 1 year |  |  |  |  |  |  |  |
Business Combination, Acquisition Related Costs |  |  | $ 206,000 |  | $ 3,818,000 |  |  |  |
Monument Bancorp, Inc | Subordinated debt, Redeemed April 1, 2019 |  |  |  |  |  |  |  |  |
BUSINESS COMBINATIONS |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Subordinated Debt | $ 5,400,000 |  |  |  |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net, Total | 0 |  |  |  |  |  |  |  |
Monument Bancorp, Inc | Core Deposits |  |  |  |  |  |  |  |  |
BUSINESS COMBINATIONS |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | $ 1,500,000 |  |  |  |  |  |  |  |

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