Fair Value Measurements - Fair Value Measurement Inputs and Valuation Techniques (Details) - IRLCs - Not Designated as Hedging Instrument	Jun. 30, 2020	Dec. 31, 2019
Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value rates, IRLCs	0.40	0.56
Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value rates, IRLCs	1	1
Weighted average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Fair value rates, IRLCs	0.70	0.78