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Mortgage Banking Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Derivatives, Fair Value [Line Items]          
Net loss relating to mortgage banking derivative instruments $ (21) $ (145) $ (21) $ (309)  
Mortgage banking derivatives          
Derivatives, Fair Value [Line Items]          
Derivative asset, notional amount   $ 137,000   $ 137,000 $ 367,700
Mortgage banking derivatives | Other Assets          
Derivatives, Fair Value [Line Items]          
Derivative asset, notional amount $ 1,600   $ 1,600    
Derivative asset         $ 5,200