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Transactions With Affiliates (Details) - USD ($)	9 Months Ended
Transactions With Affiliates (Details) - USD ($)	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Deposits	$ 5,112,512,000		$ 5,462,060,000
Payments to acquire available-for-sale securities, debt	246,958,000	$ 27,658,000
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Deposits	0		0
Directors, Executive Officers, Principal Stockholders and Affiliates [Member]
Related Party Transaction [Line Items]
Due from related parties	3,200,000		$ 4,700,000
J.V.B. Financial Group, LLC (JVB) [Member]
Related Party Transaction [Line Items]
Amount of purchases from affiliates	0	0
Duane Morris LLP [Member]
Related Party Transaction [Line Items]
Payment for legal services	$ 1,500,000	$ 1,400,000