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Allowance for Credit Losses on Loans and Leases - Summary of Additional Information about Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 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 841 3,516
Impaired loans with an allowance recorded, Recorded Investment 15,151 1,445
Impaired loans with an allowance recorded, Unpaid Principal Balance   4,173
Impaired loans with an allowance recorded, Related Allowance 1,110 116
Impaired loans with an allowance recorded, Average Recorded Investment   4,111
Impaired loans with an allowance recorded, Interest Income Recognized 99 13
Total impaired loans, Recorded Investment 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 940 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 589  
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 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 9,886  
Impaired loans with an allowance recorded, Related Allowance 133  
Impaired loans with an allowance recorded, Interest Income Recognized 52  
Total impaired loans, Recorded Investment 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 52 371
One-to-Four Family    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 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 21 21
Impaired loans with an allowance recorded, Recorded Investment 1,139  
Impaired loans with an allowance recorded, Related Allowance 370  
Impaired loans with an allowance recorded, Interest Income Recognized 14  
Total impaired loans, Recorded Investment 1,696 584
Total impaired loans, Unpaid Principal Balance   602
Total impaired loans, Average Recorded Investment   811
Total impaired loans, Interest Income Recognized 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 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 820 2,494
Impaired loans with an allowance recorded, Recorded Investment 58 1,445
Impaired loans with an allowance recorded, Unpaid Principal Balance   4,173
Impaired loans with an allowance recorded, Related Allowance 18 116
Impaired loans with an allowance recorded, Average Recorded Investment   4,111
Impaired loans with an allowance recorded, Interest Income Recognized 5 13
Total impaired loans, Recorded Investment 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 $ 825 $ 2,507