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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value option $ 0 $ 0
Non-marketable equity securities held in other financial institutions 45,192,000 62,586,000
Impairment recorded on investments in equity securities that do not have readily determinable fair values 0  
Liability to repurchase past due GNMA loans 43,400,000 55,500,000
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value of impaired loans 4,800,000 12,300,000
Foreclosed assets 1,500,000 $ 1,600,000
Fair Value, Measurements, Nonrecurring | Fair Value, Inputs, Level 3 | Residential real estate | Real estate    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Residential mortgage loans in the process of foreclosure $ 5,900,000  
Minimum | Measurement Input, Credit Spread    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit spread, securities at fair value through income 0.83% 0.83%
Credit spread, loans held-for-investment   2.90%
Maximum | Measurement Input, Credit Spread    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Credit spread, securities at fair value through income 2.27% 2.27%
Credit spread, loans held-for-investment   4.13%