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BUSINESS COMBINATIONS - Covenant Financial Assets and Liabilities (Details) - USD ($) | Sep. 30, 2020 | Jul. 01, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
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BUSINESS COMBINATIONS |  |  |  |  |  |  |
Goodwill | $ 52,526,000 |  | $ 28,388,000 | $ 28,388,000 | $ 28,618,000 | $ 28,618,000 | $ 11,942,000
Covenant Financial Inc. |  |  |  |  |  |  |
BUSINESS COMBINATIONS |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 97,792,000 |  |  |  |  |
Available-for-sale debt securities |  | 10,754,000 |  |  |  |  |
Loans receivable |  | 464,792,000 |  |  |  |  |
Bank-owned life insurance |  | 11,170,000 |  |  |  |  |
Accrued interest receivable |  | 1,922,000 |  |  |  |  |
Bank premises and equipment |  | 3,250,000 |  |  |  |  |
Foreclosed assets held for sale |  | 860,000 |  |  |  |  |
Deferred tax asset, net |  | 1,469,000 |  |  |  |  |
Core deposit intangible |  | 3,144,000 |  |  |  |  |
Goodwill |  | 24,138,000 |  |  |  |  |
Other assets |  | 13,478,000 |  |  |  |  |
Deposits |  | (481,796,000) |  |  |  |  |
Short-term borrowings |  | (33,950,000) |  |  |  |  |
Long-term borrowings |  | (30,025,000) |  |  |  |  |
Subordinated debt |  | (10,091,000) |  |  |  |  |
Accrued interest and other liabilities |  | (13,641,000) |  |  |  |  |
Estimated excess fair value of assets acquired over liabilities assumed |  | 63,266,000 |  |  |  |  |
Federal Home Loan Bank of Pittsburgh stock |  | 2,939,000 |  |  |  |  |
Covenant Financial Inc. | Core Deposits |  |  |  |  |  |  |
BUSINESS COMBINATIONS |  |  |  |  |  |  |
Core deposit intangible |  | $ 3,144,000 |  |  |  |  |

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