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Fair Value Measurements and Disclosures - Fair value on a recurring basis (Details) - Interest rate lock commitments - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Balance at beginning of the period $ 504 $ 310
Increase in value 6,428 194
Balance at end of the period $ 6,932 $ 504