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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
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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

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- Definition Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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