Securities - Carrying and Ownership Percentage of Each Equity Method Investment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 97,566	$ 84,150
Apiture, Inc.
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 51,211	$ 52,323
Equity method investment ownership percentage	39.10%	39.10%
Canapi Ventures SBIC Fund, LP
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 19,058	$ 19,431
Equity method investment ownership percentage	2.90%	2.90%
Canapi Ventures Fund, LP
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 2,350	$ 2,402
Equity method investment ownership percentage	1.50%	1.50%
Canapi Ventures Fund II, LP
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 7,500
Equity method investment ownership percentage	1.70%
Other Fintech Investments in Private Companies
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 5,077	$ 5,330
Equity method investment ownership percentage	Various	Various
Other
Schedule Of Equity Method Investments [Line Items]
Equity method investments	$ 12,370	$ 4,664
Equity method investment ownership percentage	Various	Various