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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Nonaccrual Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 27,866 $ 22,634
Impaired loans with no related allowance, Interest Income Recognized 102 841
Impaired loans with an allowance recorded, Recorded Investment 5,312 15,151
Impaired loans with an allowance recorded, Related Allowance 904 1,110
Impaired loans with an allowance recorded, Interest Income Recognized 6 99
Total impaired loans, Recorded Investment 33,178 37,785
Total impaired loans, Interest Income Recognized 108 940
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 6,840  
Impaired loans with no related allowance, Interest Income Recognized 81  
Impaired loans with an allowance recorded, Recorded Investment 3,048 4,068
Impaired loans with an allowance recorded, Related Allowance 435 589
Impaired loans with an allowance recorded, Interest Income Recognized 0 28
Total impaired loans, Recorded Investment 9,888 4,068
Total impaired loans, Interest Income Recognized 81 28
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 10,491 2,256
Impaired loans with an allowance recorded, Recorded Investment 1,082 9,886
Impaired loans with an allowance recorded, Related Allowance 84 133
Impaired loans with an allowance recorded, Interest Income Recognized 2 52
Total impaired loans, Recorded Investment 11,573 12,142
Total impaired loans, Interest Income Recognized 2 52
One-to-Four Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 330 557
Impaired loans with no related allowance, Interest Income Recognized 3 21
Impaired loans with an allowance recorded, Recorded Investment 1,137 1,139
Impaired loans with an allowance recorded, Related Allowance 365 370
Impaired loans with an allowance recorded, Interest Income Recognized 3 14
Total impaired loans, Recorded Investment 1,467 1,696
Total impaired loans, Interest Income Recognized 6 35
Other Loans    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 10,205 19,821
Impaired loans with no related allowance, Interest Income Recognized 18 820
Impaired loans with an allowance recorded, Recorded Investment 45 58
Impaired loans with an allowance recorded, Related Allowance 20 18
Impaired loans with an allowance recorded, Interest Income Recognized 1 5
Total impaired loans, Recorded Investment 10,250 19,879
Total impaired loans, Interest Income Recognized $ 19 $ 825