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Troubled Debt Restructurings (Narrative) (Details)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
loan
contract
Sep. 30, 2020
contract
Sep. 30, 2021
USD ($)
loan
contract
Sep. 30, 2020
contract
Dec. 31, 2020
USD ($)
loan
Financing Receivable Modifications [Line Items]          
Number of troubled debt restructured loans | loan     17   17
Financing Receivable, Modifications, Nonaccrual, Number of Contracts | loan 3   3   3
Financing Receivable, Modifications, Nonaccrual, Recorded Investment | $ $ 791   $ 791   $ 796
Total troubled debt restructured loans | $ $ 2,700   $ 2,700   $ 3,300
Number of deferral loans of interest and principal payments | loan 2   2   255
Number of contractions modified by granting concession   1 3    
Number of contracts modified by changing the amortization period   1   1  
Number of contracts modified by reduced payment amount   1   1  
Number of payment defaults 0 0 0 0  
Residential Single Family          
Financing Receivable Modifications [Line Items]          
Loan is considered payment default     30 days    
Payment Deferral [Member] | CARES Act [Member]          
Financing Receivable Modifications [Line Items]          
Deferrals on outstanding loan balances | $ $ 41   $ 41   $ 130,500