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NET LOANS RECEIVABLE - Balance in Allowance for Loan Losses and recorded Investment (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019
--- | --- | --- | --- | --- | --- | ---
Allowance for loan losses: |  |  |  |  |  |
Related to loans individually evaluated for impairment | $ 1,679 |  | $ 929 |  |  |
Related to loans collectively evaluated for impairment | 21,714 |  | 21,922 |  |  |
Ending balance | 23,393 | $ 23,609 | 22,851 | $ 16,493 | $ 14,999 | $ 14,499
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 8,260 |  | 8,407 |  |  |
Loans collectively evaluated for impairment | 1,124,884 |  | 1,162,238 |  |  |
Total | 1,133,144 |  | 1,170,645 |  |  |
Commercial |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Related to loans individually evaluated for impairment | 1,679 |  | 929 |  |  |
Related to loans collectively evaluated for impairment | 16,395 |  | 16,641 |  |  |
Ending balance | 18,074 | 18,334 | 17,570 | 12,760 | 11,408 | 11,057
Loans: |  |  |  |  |  |
Individually evaluated for impairment | 8,260 |  | 8,407 |  |  |
Loans collectively evaluated for impairment | 731,418 |  | 771,073 |  |  |
Total | 739,678 |  | 779,480 |  |  |
Residential mortgages |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Related to loans collectively evaluated for impairment | 3,544 |  | 3,484 |  |  |
Ending balance | 3,544 | 3,475 | 3,484 | 2,452 | 2,379 | 2,360
Loans: |  |  |  |  |  |
Loans collectively evaluated for impairment | 287,176 |  | 279,960 |  |  |
Total | 287,176 |  | 279,960 |  |  |
Home equity loans and lines |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Related to loans collectively evaluated for impairment | 1,287 |  | 1,303 |  |  |
Ending balance | 1,287 | 1,313 | 1,303 | 868 | 850 | 813
Loans: |  |  |  |  |  |
Loans collectively evaluated for impairment | 77,068 |  | 80,345 |  |  |
Total | 77,068 |  | 80,345 |  |  |
Consumer |  |  |  |  |  |
Allowance for loan losses: |  |  |  |  |  |
Related to loans collectively evaluated for impairment | 488 |  | 494 |  |  |
Ending balance | 488 | $ 487 | 494 | $ 413 | $ 362 | $ 269
Loans: |  |  |  |  |  |
Loans collectively evaluated for impairment | 29,222 |  | 30,860 |  |  |
Total | $ 29,222 |  | $ 30,860 |  |  |

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