Fair Value Measurements - Summary of Level 3 Fair Value Measurement Inputs (Details) - Valuation Technique, Discounted Cash Flow - Level 3	Dec. 31, 2019
Measurement Input, Discount Rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.075
Product, Silver | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	17.00
Product, Zinc | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	1.07
Product, Lead | Measurement Input, Quoted Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Other Real Estate Owned, Measurement Input	0.93