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Troubled Debt Restructurings - Loans By Class of Financing Receivable Modified as TDRs (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2020
contract
Sep. 30, 2019
USD ($)
contract
Dec. 31, 2019
contract
Troubled Debt Restructuring Subsequent Periods [Line Items]      
Number of troubled debt restructured loans 16   18
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts   1  
Troubled Debt Restructurings Within Previous Twelve Months [Member]      
Troubled Debt Restructuring Subsequent Periods [Line Items]      
Troubled Debt Restructuring Modifications Recorded Investment | $   $ 74  
Troubled Debt Restructurings Within Previous Twelve Months [Member] | Residential Single Family      
Troubled Debt Restructuring Subsequent Periods [Line Items]      
Number of troubled debt restructured loans   1  
Troubled Debt Restructuring Modifications Recorded Investment | $   $ 74