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Allowance for Loan and Lease Losses - Summary of Additional Information about Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 39,182 $ 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 692 3,516
Impaired loans with an allowance recorded, Recorded Investment 6,169 1,445
Impaired loans with an allowance recorded, Unpaid Principal Balance   4,173
Impaired loans with an allowance recorded, Related Allowance 716 116
Impaired loans with an allowance recorded, Average Recorded Investment   4,111
Impaired loans with an allowance recorded, Interest Income Recognized 75 13
Total impaired loans, Recorded Investment 45,351 58,381
Total impaired loans, Unpaid Principal Balance   147,322
Total impaired loans, Average Recorded Investment   58,504
Total impaired loans, Interest Income Recognized 767 3,529
Multi-Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment   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   266
Impaired loans with an allowance recorded, Recorded Investment 4,068  
Impaired loans with an allowance recorded, Related Allowance 444  
Impaired loans with an allowance recorded, Interest Income Recognized 28  
Total impaired loans, Recorded Investment 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 28 266
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 12,006 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 667  
Impaired loans with an allowance recorded, Related Allowance 53  
Impaired loans with an allowance recorded, Interest Income Recognized 27  
Total impaired loans, Recorded Investment 12,673 14,717
Total impaired loans, Unpaid Principal Balance   19,832
Total impaired loans, Average Recorded Investment   6,140
Total impaired loans, Interest Income Recognized 27 371
One-to-Four Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 563 584
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 16 21
Impaired loans with an allowance recorded, Recorded Investment 1,143  
Impaired loans with an allowance recorded, Related Allowance 199  
Impaired loans with an allowance recorded, Interest Income Recognized 10  
Total impaired loans, Recorded Investment 1,706 584
Total impaired loans, Unpaid Principal Balance   602
Total impaired loans, Average Recorded Investment   811
Total impaired loans, Interest Income Recognized 26 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 26,613 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 676 2,494
Impaired loans with an allowance recorded, Recorded Investment 291 1,445
Impaired loans with an allowance recorded, Unpaid Principal Balance   4,173
Impaired loans with an allowance recorded, Related Allowance 20 116
Impaired loans with an allowance recorded, Average Recorded Investment   4,111
Impaired loans with an allowance recorded, Interest Income Recognized 10 13
Total impaired loans, Recorded Investment 26,904 39,114
Total impaired loans, Unpaid Principal Balance   118,809
Total impaired loans, Average Recorded Investment   43,709
Total impaired loans, Interest Income Recognized $ 686 $ 2,507