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Fair Value Measurements and Disclosures - Fair value on a recurring basis (Details) - Interest rate lock commitments - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Balance at beginning of the period $ 2,667 $ 4,595 $ 6,932 $ 504
(Decrease) Increase in value (955) 3,203 (5,220) 7,294
Balance at end of the period $ 1,712 $ 7,798 $ 1,712 $ 7,798