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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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Equity Securities without Readily Determinable Fair Value, Upward (Downward) Price Adjustment, Annual Amount

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
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Amount of investment in equity security without readily determinable fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
-Paragraph 3
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Amount of impairment loss on investment in equity security without readily determinable fair value.

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-Name Accounting Standards Codification
-Topic 321
-SubTopic 10
-Section 50
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