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Equity Investments - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Net Investment Income [Line Items]      
Equity investments with readily determinable fair value $ 57,860,000 $ 59,699,000  
Sale of equity stock in other institutions 1,277,000 201,000 $ 2,570,000
Equity investments without readily determinable fair values 31,000,000 32,100,000  
Equity investments without readily determinable fair values, impairment 0 0  
Equity investments without readily determinable fair values, observable price changes 0 0  
Mutual funds      
Net Investment Income [Line Items]      
Equity investments with readily determinable fair value 26,800,000 27,600,000  
Purchase of equity method investments 0    
Community reinvestment act investments      
Net Investment Income [Line Items]      
Equity investments without readily determinable fair values 29,700,000 30,700,000  
Payments to acquire equity method investments without readily determinable value 0 5,000,000  
Community development financial institutions      
Net Investment Income [Line Items]      
Equity investments without readily determinable fair values 1,000,000 1,000,000  
Correspondent bank stock      
Net Investment Income [Line Items]      
Equity investments without readily determinable fair values $ 370,000 $ 370,000