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Transactions With Affiliates (Details) - USD ($)	3 Months Ended		6 Months Ended
Transactions With Affiliates (Details) - USD ($)	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Related Party Transaction [Line Items]
Deposits	$ 5,545,199,000		$ 5,545,199,000		$ 5,052,030,000
Legal expense	2,229,000	$ 1,534,000	3,142,000	$ 2,858,000
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Deposits	0		0		0
Directors, Executive Officers, Principal Stockholders and Affiliates [Member]
Related Party Transaction [Line Items]
Due from related parties	2,300,000		2,300,000		2,300,000
J.V.B Financial Group LLC [Member]
Related Party Transaction [Line Items]
Amount of purchases from affiliates			0	755,000
Securities under agreements to resell, outstanding amount	$ 0		0		$ 0
Duane Morris LLP [Member]
Related Party Transaction [Line Items]
Legal expense			$ 734,000	$ 692,000