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Equity Investments - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Net Investment Income [Line Items]          
Equity investments with readily determinable fair value $ 59,032,000   $ 59,032,000   $ 59,699,000
Equity investments without readily determinable fair values 31,800,000   31,800,000   32,100,000
Equity investments without readily determinable fair values, impairment 0 $ 0 0 $ 0  
Equity investments without readily determinable fair values, observable price changes 0 $ 0 0 $ 0  
Mutual funds          
Net Investment Income [Line Items]          
Equity investments with readily determinable fair value 27,200,000   27,200,000   27,600,000
Correspondent bank stock          
Net Investment Income [Line Items]          
Equity investments without readily determinable fair values 370,000   370,000   370,000
CDFI investments          
Net Investment Income [Line Items]          
Equity investments without readily determinable fair values 1,000,000.0   1,000,000.0   1,000,000.0
CRA investments          
Net Investment Income [Line Items]          
Equity investments without readily determinable fair values $ 30,500,000   $ 30,500,000   $ 30,700,000