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Fair Value of Financial Instruments - Narrative (Details) - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-marketable equity securities held in other financial institutions $ 76,822,000 $ 45,192,000
Impairment recorded on investments in equity securities that do not have readily determinable fair values 0  
Liability to repurchase past due GNMA loans 30,700,000 43,400,000
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 4,200,000 4,800,000
Foreclosed assets 1,800,000 $ 1,800,000
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 $ 10,000  
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%
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%