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Borrowings (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]          
New Repurchase Agreement Debt Amount du to Unwind $ 232,000   $ 232,000    
Other borrowings 1,753   1,753   $ 1,734
Subordinated Debt 102,983   102,983   102,633
Gains Losses On Extinguishment Of Debt 0 $ 0 (12,000) $ 0  
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 895,000   $ 895,000   $ 770,600
Weighted average period remaining maturity of FHLB advances     5.4 months   6.3 months
Interest Payable 336   $ 336    
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