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Transactions With Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Deposits	$ 3,858,058		$ 3,858,058		$ 4,260,842
Securities purchased under agreements to resell	64,518		64,518		64,312
Legal expense	1,610	$ 2,744	5,811	$ 5,909
Affiliated Entity [Member]
Related Party Transaction [Line Items]
Deposits	797		797		4,700
Directors, Executive Officers, Principal Stockholders and Affiliates [Member] \| Loans, Net Of Deferred Loan Fees And Costs [Member]
Related Party Transaction [Line Items]
Due from related parties	1,800		1,800		1,700
J.V.B. Financial Group, LLC [Member]
Related Party Transaction [Line Items]
Securities purchased under agreements to resell	$ 64,500		64,500		$ 64,300
J.V.B. Financial Group, LLC [Member] \| SBA Loan [Member]
Related Party Transaction [Line Items]
Payments to acquire available-for-sale securities, debt			6,700
Duane Morris LLP [Member]
Related Party Transaction [Line Items]
Legal expense			$ 2,200	$ 2,500