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Equity Investments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Net Investment Income [Line Items] |  |  |
Equity investments with readily determinable fair value | $ 59,049,000 |  | $ 59,699,000
Equity investments without readily determinable fair values | 31,900,000 |  | 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 | 27,100,000 |  | 27,600,000
Correspondent bank stock |  |  |
Net Investment Income [Line Items] |  |  |
Equity investments without readily determinable fair values | 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
CRA investments |  |  |
Net Investment Income [Line Items] |  |  |
Equity investments without readily determinable fair values | $ 30,600,000 |  | $ 30,700,000

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