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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
Mar. 31, 2021
Mar. 31, 2020
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of the period $ 6,932 $ 504
(Decrease) Increase in value (3,647) 3,517
Balance at end of the period $ 3,285 $ 4,021