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Loans Receivable Held for Investment - Loans Individually Evaluated for Impairment by Loan Type (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Impaired loans |  |
Unpaid Principal Balance | $ 11,193 | $ 14,628
Recorded Investment | 9,305 | 11,897
Allowance for Loan Losses Allocated, With an allowance recorded | 585 | 656
Single family |  |
Impaired loans |  |
Unpaid Principal Balance, With an allowance recorded | 627 | 644
Recorded Investment, With an allowance recorded | 627 | 644
Allowance for Loan Losses Allocated, With an allowance recorded | 100 | 125
Multi-family |  |
Impaired loans |  |
Unpaid Principal Balance, With no related allowance recorded |  | 642
Unpaid Principal Balance, With an allowance recorded | 333 |
Recorded Investment, With no related allowance recorded |  | 642
Recorded Investment, With an allowance recorded | 333 |
Allowance for Loan Losses Allocated, With an allowance recorded | 1 |
Church |  |
Impaired loans |  |
Unpaid Principal Balance, With no related allowance recorded | 5,140 | 5,946
Unpaid Principal Balance, With an allowance recorded | 5,028 | 7,330
Recorded Investment, With no related allowance recorded | 3,291 | 3,589
Recorded Investment, With an allowance recorded | 4,989 | 6,956
Allowance for Loan Losses Allocated, With an allowance recorded | 479 | 516
Commercial - other |  |
Impaired loans |  |
Unpaid Principal Balance, With an allowance recorded | 65 | 66
Recorded Investment, With an allowance recorded | 65 | 66
Allowance for Loan Losses Allocated, With an allowance recorded | $ 5 | $ 15

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