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Transactions With Affiliates (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Related Party Transaction [Line Items]          
Deposits $ 3,565,395,000   $ 3,565,395,000   $ 4,238,304,000
Securities purchased under agreements to resell 65,095,000   65,095,000   39,199,000
Legal expense 2,744,000 $ 814,000 5,909,000 $ 3,786,000  
Affiliated Entity [Member]          
Related Party Transaction [Line Items]          
Deposits 3,500,000   3,500,000   5,500,000
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 1,400,000   1,400,000   649,000
J.V.B. Financial Group, LLC [Member]          
Related Party Transaction [Line Items]          
Securities purchased under agreements to resell $ 65,100,000   65,100,000   $ 39,200,000
J.V.B. Financial Group, LLC [Member] | SBA Loan [Member]          
Related Party Transaction [Line Items]          
Payments to acquire available-for-sale securities, debt     2,800,000    
Duane Morris LLP [Member]          
Related Party Transaction [Line Items]          
Legal expense     $ 2,500,000 $ 2,400,000