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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]          
New Repurchase Agreement Debt Amount du to Unwind $ 232,000   $ 232,000    
Other borrowings 40   40   $ 1,734
Subordinated Debt 36,083   36,083   102,633
Gains Losses On Extinguishment Of Debt 0 $ 0 (12,000) $ 0  
Repayments Of Subordinated Debt     67,000    
Federal Home Loan Bank Advances [Member]          
Debt Instrument [Line Items]          
Loans Receivable, Gross, Commercial, Mortgage 1,500,000   1,500,000   1,300,000
Additional Borrowing Capacity 1,100,000   $ 1,100,000   $ 770,600
Weighted average period remaining maturity of FHLB advances     12.5 months   6.3 months
Interest Payable 293   $ 293    
Repurchase agreement          
Debt Instrument [Line Items]          
Interest Payable 1,600   1,600   $ 2,200
Extinguished Debt 268,000   268,000    
Total Of Debt Matured Under Repurchased Agreement $ 500,000   $ 500,000