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Financial Instruments With Off-Balance Sheet Risk, Contingencies and Concentration of Credit Risk (Details) - USD ($)
12 Months Ended
May 01, 2019
Dec. 31, 2020
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Pending unsettled loan repurchase demand, amount   $ 200,000
Standby Letters of Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value disclosure, liability, face amount   21,100,000
Commitments to Extend Credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Fair value disclosure, liability, face amount   $ 924,500,000
Snyder v Crusador Servicing Corporation Case | Crusador    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Ownership percentage of Crusador (as a percent)   80.00%
Damages awarded $ 2,190,000  
Interest rate (as a percent) 6.00%