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Loans Receivable and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Impaired loans          
Average Recorded Investment $ 1,346 $ 1,490 $ 1,359 $ 1,507  
Interest Income Recognized 9 8 17 17  
One- to four-family residential          
Impaired loans          
Average Recorded Investment 1,321 1,390 1,334 1,404  
Interest Income Recognized 9 8 17 17  
Home Equity Loans and Lines of Credit          
Impaired loans          
Average Recorded Investment 25 $ 100 25 $ 103  
Individually Evaluated for Impairment          
Impaired loans          
Recorded Investment 1,334   1,334   $ 1,313
Unpaid Principal Balance 1,758   1,758   1,793
Loans individually evaluated for impairment with a related allowance for loan loss 0   0   0
Individually Evaluated for Impairment | One- to four-family residential          
Impaired loans          
Recorded Investment 1,310   1,310   1,224
Unpaid Principal Balance 1,726   1,726   1,615
Individually Evaluated for Impairment | Home Equity Loans and Lines of Credit          
Impaired loans          
Recorded Investment 24   24   89
Unpaid Principal Balance $ 32   $ 32   $ 178