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Goodwill and Intangible Assets - Intangible Assets Mortgage Servicing Rights (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]      
Fair market value adjustment $ (115,000)    
Mortgage Servicing Rights      
Finite Lived Intangible Assets [Line Items]      
Beginning balance 516,000 $ 1,444,000 $ 1,444,000
Fair market value adjustment 474,000 (328,000) (273,000)
Mortgage servicing rights amortized (528,000) (415,000) (593,000)
Interest only strip (7,000) (40,000) (62,000)
Ending balance $ 455,000 $ 661,000 $ 516,000