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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment $ 27,866 $ 22,634 $ 56,936
Impaired loans with no related allowance, Unpaid Principal Balance     143,149
Impaired loans with no related allowance, Average Recorded Investment     54,393
Impaired loans with no related allowance, Interest Income Recognized 102 841 3,516
Impaired loans with an allowance recorded, Recorded Investment 5,312 15,151 1,445
Impaired loans with an allowance recorded, Unpaid Principal Balance     4,173
Impaired loans with an allowance recorded, Related Allowance 904 1,110 116
Impaired loans with an allowance recorded, Average Recorded Investment     4,111
Impaired loans with an allowance recorded, Interest Income Recognized 6 99 13
Total impaired loans, Recorded Investment 33,178 37,785 58,381
Total impaired loans, Unpaid Principal Balance     147,322
Total impaired loans, Average Recorded Investment     58,504
Total impaired loans, Interest Income Recognized 108 940 3,529
Multi-Family      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment 6,840   3,577
Impaired loans with no related allowance, Unpaid Principal Balance     6,790
Impaired loans with no related allowance, Average Recorded Investment     4,336
Impaired loans with no related allowance, Interest Income Recognized 81   266
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 3,577
Total impaired loans, Unpaid Principal Balance     6,790
Total impaired loans, Average Recorded Investment     4,336
Total impaired loans, Interest Income Recognized 81 28 266
Commercial Real Estate      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment 10,491 2,256 14,717
Impaired loans with no related allowance, Unpaid Principal Balance     19,832
Impaired loans with no related allowance, Average Recorded Investment     6,140
Impaired loans with no related allowance, Interest Income Recognized     371
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 14,717
Total impaired loans, Unpaid Principal Balance     19,832
Total impaired loans, Average Recorded Investment     6,140
Total impaired loans, Interest Income Recognized 2 52 371
One-to-Four Family      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment 330 557 584
Impaired loans with no related allowance, Unpaid Principal Balance     602
Impaired loans with no related allowance, Average Recorded Investment     811
Impaired loans with no related allowance, Interest Income Recognized 3 21 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 1,696 584
Total impaired loans, Unpaid Principal Balance     602
Total impaired loans, Average Recorded Investment     811
Total impaired loans, Interest Income Recognized 6 35 21
Acquisition, Development, and Construction      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment     389
Impaired loans with no related allowance, Unpaid Principal Balance     1,289
Impaired loans with no related allowance, Average Recorded Investment     3,508
Impaired loans with no related allowance, Interest Income Recognized   364
Total impaired loans, Recorded Investment     389
Total impaired loans, Unpaid Principal Balance     1,289
Total impaired loans, Average Recorded Investment     3,508
Total impaired loans, Interest Income Recognized     364
Other Loans      
Financing Receivable, Impaired [Line Items]      
Impaired loans with no related allowance, Recorded Investment 10,205 19,821 37,669
Impaired loans with no related allowance, Unpaid Principal Balance     114,636
Impaired loans with no related allowance, Average Recorded Investment     39,598
Impaired loans with no related allowance, Interest Income Recognized 18 820 2,494
Impaired loans with an allowance recorded, Recorded Investment 45 58 1,445
Impaired loans with an allowance recorded, Unpaid Principal Balance     4,173
Impaired loans with an allowance recorded, Related Allowance 20 18 116
Impaired loans with an allowance recorded, Average Recorded Investment     4,111
Impaired loans with an allowance recorded, Interest Income Recognized 1 5 13
Total impaired loans, Recorded Investment 10,250 19,879 39,114
Total impaired loans, Unpaid Principal Balance     118,809
Total impaired loans, Average Recorded Investment     43,709
Total impaired loans, Interest Income Recognized $ 19 $ 825 $ 2,507